Title of Invention	A YARN WINDING METHOD AND A YARN WINDING DEVICE
Abstract	A yarn winding method and a yarn winding device capable of avoiding the ribbon wind for all bobbin holders even if a difference in winding diameter occurs in any of packages while yarns are wound on a plurality of bobbin holders by one traverse means. In the yarn winding device wherein bobbins (3) and (3) are fitted on the bobbin holders (1) and (2), the packages (P) and (p) are wound on the bobbins installed on the bobbin holders while traversing the yarns (Y) and (Y) by a traverse cam (9), and wherc any of the bobbin holders reaches a specified wind ratio, a traverse speed In winding is increased so that the wind ratio can avoid a ribbon wind area. The yarn winding device comprises the plurality of bobbin holders whereby the windings of the packages are performed simultaneously and the single common traverse means installed for the plurality of bobbin holders. When the bobbin holder with the largest winding diameter in winding among the plurality of bobbin holders reaches the wind ratio that must be avoided, the traverse speed is increased so that the bobbin holfiei with the minimum winding diameter can avoid the ribbon wind area so as to Keep all the bobbin holders away from the ribbon wind area.

Title of Invention

A YARN WINDING METHOD AND A YARN WINDING DEVICE

Abstract

A yarn winding method and a yarn winding device capable of avoiding the ribbon wind for all bobbin holders even if a difference in winding diameter occurs in any of packages while yarns are wound on a plurality of bobbin holders by one traverse means. In the yarn winding device wherein bobbins (3) and (3) are fitted on the bobbin holders (1) and (2), the packages (P) and (p) are wound on the bobbins installed on the bobbin holders while traversing the yarns (Y) and (Y) by a traverse cam (9), and wherc any of the bobbin holders reaches a specified wind ratio, a traverse speed In winding is increased so that the wind ratio can avoid a ribbon wind area. The yarn winding device comprises the plurality of bobbin holders whereby the windings of the packages are performed simultaneously and the single common traverse means installed for the plurality of bobbin holders. When the bobbin holder with the largest winding diameter in winding among the plurality of bobbin holders reaches the wind ratio that must be avoided, the traverse speed is increased so that the bobbin holfiei with the minimum winding diameter can avoid the ribbon wind area so as to Keep all the bobbin holders away from the ribbon wind area.

Full Text	A Yarn Minding Method and a Yarn Winding Device (Technical Field) [000l] The present invention relates to a yarn winding method and a yarn vending device, and more specifically, it relates to a yarn winding method and a yarn winding device wherein bobbins are fitted on bobbin holders., packages are wound on the bobbins installed on the bobbin holders while traversing the yarns by traverse means, and when the bobbin holders reach a specified wind ratio, a traverse speed, in winding is increased so that, the wind raLia can Avoid s ribbon wind area. (Background Art) [0002] Generally, in a procedure wherein a yarn is wound at a high speed onto a bobbin holder so as to form a package, when the "wind ratio", which is defined as ratio between the rotational speed of the bobbin holder and the number, of traverse, becomes an integral number or an integral number + 1/2, so called ribbon wind is generated because yarns, which ate returned at both the ends of the package and which are traversed onto the package, i.e., the yarn which was wound at previous traverse time and the yarn which will be wound at next traverse time, directly locate one above the other, [0003] When ribbon wind causes, such problems may occur that wound yarn density and mass distribution in the package become non-uniform, that vibration may cause during winding of package, that yarn breakage or collapae of package occurs, and in the later process, there may occur such a problem that withdrawal Of yarn from package cannot done smoothly. (0004) In order to obviate the above—described problems, method for avoiding the ribbon wind generating area, i.e., ribbon wind area, is generally carried out wherein the traverse speed Vt is rapidly increased near the wind ratio so that the wind ratio does not become an integral number. - 1 - [0005] In recent years, in order to Increase production, there is a tendency to apply multi-ends by combining a plurality of winding machines. [0006] for example, Patent Reference 1, i.e., Japanese Patent Application Laid-open Mo. 2002-515388. discloses that two turret tables are arranged vertically on one machine frame, and unite constructed by them are arranged symmetrically in a horizontal direction. [0007] Further, the present applicant proposed in Patent Reference 2, i.e., Japanese Patent Application No. 2002-033760, in order to increase space efficiency and to reduce the equipment cost, a revolving type automatic yarn winding machine comprising a turret table rotatable about a rotating center and having at least two bobbin holders ratatably mounted thereon, a press roller and a traverse device disposed upstream along a yarn passage relative to the bobbin holder, wheraby a bobbin installed on one bobbin holder is switched to a bobbin installed on the other bobbin holder when the yarn wound, on the bobbin reaches a predetermined amount characterized in that said turret, tables are disposed on both sides of the yarn passage, respectively, the rotating directions of one turret table and the other turret table are opposed to each other, and the rotating directions of the press roller installed correspondingly to the one turret, table and the press roller installed correspondingly to the other turret table are opposed to each other, and the press rollers and a traverse device ars positioned above the rotating centers of the turret tables, [0008] in the winding machine disclosed in Patent Reference 2, traverse devices may be disposed for the bobbin holders mounted on the two turret tables, respectively, so that packages are wound on the bobbin holders mounted on the two turret tables, and alternatively, a common single traverse device may be disposed far the bobbin holders mounted on the two turret tables so that yarns are traversed by the single traverse device and SO that - 2 - packages are wound on the bobbin holders mounted on the two turret tables. [Patant Reference l] Japanese Patent Application Laid- open No. 2002-515388 [Patent Reference 2] Japanese patent Application N0. 2002-033760 [Disclosure of the Invention] [Problems to Be Solved by the invention] [0009] The above-described Patent Reference 2 does not includes detailed description regarding the traverse control. However, In actual, the diameter of the package being wound on either one of two bobbin holders is detected as basis so as to avoid ribbon wind area. [0010] However, especially when a common single traverse device is disposed for the bobbin holders mounted on the two turret tables and when yarns are traversed by the single traverse device so as to form packages on the two bobbin holders, there may occur difference in wound diameters in the horizontally separated packages which are being wound due to the difference in the thickness of the yarns which are being wound while sandwiching the traverse device therebetween, due to the difference in the pressing pressures of the press rollers, or due to the difference in the parallelism (errors in adjustment) between the bobbin holders and the press rollers, in such occasion, since there is one single traverse device, if avoiding of ribbon wind is done based on either one wound diameter, there is a probability that ribbon wind occurs in either one of packages, especially that wound on the bobbin holder which is not used as basis of wound diameter, during winding operation. [0011] It is an object of the present invention to obviate such problems. Further, it is another object of the present invention to provide a yarn winding method and device by which ribbon wind can be avoided for all the bobbin holders even when there occurs difference in wound diameters in packages, which are being wound on a plurality of bobbin holders while a single traverse device - 3 - is used, [0012] Further, it is another object of the present invention to provide a yarn winding method and device, which can be carried out in such a yarn winding device as disclosed in the above- described Patent Reference 1 or 2, by which ribbon wind can be avoided, which winds packages with almost uniform yarn wound density and almost uniform mass distribution, by which vibration, yarn breakage, or collapse of package dose not occur during package winding operation, and which can wind yarn packages with. good withdrawal efficiency at a later process, [Means to solve the Problems] [0013] According to the present invention, the above-described objects are achieved by a yarn winding method wherein bobbins are fitted on bobbin holders, packages are wound on the bobbins installs-d on the bobbin holders while traversing the yarns by traverse means, and when the bobbin holders reach a specified wind ratio, a traverse speed in winding is increased so that the wind ratio can avoid a ribbon wind area, characterised in that a single common traverse means is installed for the plurality of bobbin holders so that packages are simultaneously wound on the plurality of bobbin holders, and when any of the plurality of bobbin holders reaches a wind ratio that must be avoided, the traverse means is controlled so that all the bobbin holders can avoid the ribbon wind area. [0014] Further, according to the present invention, the above- described objects are achieved by a yarn winding device wherein bobbins are fitted on bobbin holders, packages are wound on the bobbins installed on the bobbin holdets while traversing the yarns by traverse means, and when the bobbin holders reach a specified wind ratio, a traverse speed in winding is increased so that the wind ratio can avoid a ribbon wind area, characterized in that a plurality of bobbin holders on which winding of packages are simultaneously performed are disposed, and a single Common traverse means is installed for the plurality of bobbin - 4 - holders, and said, traverse means comprises a traverse device and a traverse control device for controlling said, traverse device, whereby said traverse control device controls said traverse device, so that all the bobbin holders can avoid the ribbon wind area when any of the plurality of bobbin holders resches a wind ratio that must be avoided. [0015] In these occasions, it is preferred that the wind ratio before avoiding the ribbon wind area is calculated based on the bobbin holder with the largest winding diameter in winding, and that the wind ratio after avoiding the ribbon wind area is so set that the bobbin holder with the minimum winding diameter in winding avoids the ribbon wind area. [0016] Further, it is preferred that the wind ratio before avoiding the ribbon wind area and the wind ratio aftes avoiding the ribbon wind area are compared with each other, and that when the difference in winding angles of the wound packages exceeds a predetermined amount, warning signals are sent. [0017] According to the present invention, the traverse means may ccmprise a single traverse device disposed eommonly for a plurality of bobbin holders and a traverse control device for controlling the single traverse device. Alternatively, according to the present invention, said traverse means may comprise a plurality of traverse devices disposed for said plurality of bobbin holders, respectively, and a traverse control device fp.t controlling said plurality of traverse devices. [0018] According to the present invention, even such a construction as disclosed in Patent Reference 1, i,e., Japanese Patent Application Laid-open No, 2002-515383, is used, ribbon wind of packages being wound on all the bobbin holders by means of a single traverse device, i.e., a traverse motor, can be avoided. [0019] According to the present invention, even in a revolving - 5 - type automatic winding device having a construction as disclosed in Patent Reference 2, i.e., Japanese Patent Application No. 2002- 033760, packages which are free from ribbon wind can be forced. [Advantages of the Invention] [0020] According to the present, invention, a yarn winding method and device ana provided, by which ribbon wind, for all the bobbin holders can be avoided even if difference in wound diameters occurs in any one of the package while yarns are wound on a plurality of bobbin holders by means of one single traverse device. Further, according to the present invention, a yarn winding method and device are provided, by which ribbon wind can be avoided, which winds packages with almost uniform yarn wound density and almost uniform mass distribution, by which vibration, yarn breakage, or collapse of package does not occur during package winding operation, and by which yarn packages with good withdrawal efficiency at a later process can be wound. [Best Mode for Carrying out the Invention] [0021] The present invention will now be described in detail with reference to the accompanying drawings wherein some embodiments of the present invention are illustrated, wherein Fig.l shows a schematic view showing construction of an embodiment of the winding device according to the present invention, and Fig. 2 is a view seen in a direction of arrow X, a part of which is omitted. [0023] In Figs. 1 and 2, two circular disk shaped turret tables 4 and 4' are ratatably mounted on the front surface of a machine frame 5 in such condition that their parallel central axes are horizontally spaced with each other, and each of turret tables 4 and 4' is rotatable about the respective axis by means of a rotating motor (not shown). [0023] The ends negr the machine frame of bobbin holders 1, 1' , 2 and 2' are rotatably mounted on the turret tables 4 and 4' , and bobbin holders 1, l' , 2 and 2' extend from the turret tables 4 - 6 - and 4' in a direction perpendicular to the sheet on which Fig. 1 is drawn. [0024] The bobbin holders 1, 1' , 2 and 2' have a plurality of bobbins 3 and 3' mounted thereon, respectively, and the bobbins 3 and 3' rotate together with the bobbin holders 1, 1' , 2 and 2' so as to wind yarns Y and Y' on the peripheries of the bobbins 3 and 3' and to form a plurality of packages P and P' . [0025] More specifically, in Fig. 2, the bobbin holders 1, l' , are connected to bobbin holder driving motors 12 and 12' via drive shafts 11 and 11 , and the motors 12 and 12' rotate at a rotating speed corresponding to the output from inverters 13 and 13' which are controlled by a controller 23 so as to drive the bobbin holders so that in Fig. 1, the bobbin holder 3 mounted on the right turret table A is rotated in a clockwise direction while the bobbin holder 3' mounted on the left turret table 4' is rotated in a counter-clockwise direction. Although the driving system of the bobbin holders 2 and 2' are similarly constructed, in order to simplify the explanation, the description of the bobbin holders 2 and 2' in this embodiment is omitted. The motors 12 and 12' have gears 14 and 14' , respectively, for detecting rotation of the bobbin holders mounted at the ends thereof opposite to the bobbin holders 1 and X' , and electro-magnetic pickups 15 and 15' are disposed in such a manner that they face the gears 14 and 14' respectively. Thus, the gears 14 and 14' and the electro-magnetic pickups 15 and 15' constitute means for detecting rotating numbers of the bobbin holders, and the rotating numbers Nb and Nb' of the bobbin holders 1 and 1' are detected by the electro-magnetic pickups 15 and 15' and are input into a controller 23, [0026] Referring to Fig. 1 again, when the packages P and p' , which have been wound on the bobbins 3 and 3' inserted onto the bobbin holder 1 end 1' , reach a predetermined amount, the turret table 4 and 4' are rotated in directions indicated by arrows in Fig, 1, more specifically, the right turret table 4 is rotated in - 7 - a clockwise direction and the left turret table 4' is rotated in a counter-clockwise direction, the bobbin holders 1 and 1' , on which yarns have been wound, are switched to the bobbin holders 2 and 2' , onto which empty bobbins 2 and 3' are inserted, and yarns can be continuously wound on the bobbins 3 and 3' which are inserted onto the bobbin holders 2 and 2 without repeating the initial yarn threading operation which is effected at the start ot winding. The machine frame 5 has two slide rails 6 vertically disposed therein, and a vertically movable frame 7 is lifted and lowered along the slide rails 6 by means of a fluid pressure cylinder (not shown). [0028] The vertically movable frame 7 has two contact rollers 3 and 8' rotatably mounted thereon, and the contact rollers 8 and 8' contact with and rotate the packages P and P' and apply a predetermined contacting pressure to the packages P and P' so as to form the shape and enhance the package hardness of the packages P and P . [0029] A traverse cam 9 is arranged between the two contact rollers 8 and 8' and is rotatably mounted on the vertically movable frame 7. The traverse cam 9 has cam grooves formed on the periphery thereof, and two sliders 10 and 10 are engaged With the cam grooves, which sliders reciprocalingly move yarns in a direction of the bobbins due to the rotation of the traverse cam 9, and the sliders 10 and 10' face the contact rollers, 6 and 8' , respectively. [0030] In Fig. 2, the traverse cam 9 is connected to a traverse motor 17 via a drive shaft 16, and the traverse motor 17 rotates the traverse cam 9 at a rotating speed which depends on the output of the inverter 18 which is controlled by the controller 23. Accordingly, the rotating speed of the traverse cam 9 is determined by the output of the inverter 18. Farther, the traverse motor 17 has a gears 19 for detecting rotation of the traverse cam mounted at the ends thereof near the traverse cam - 8 - 16, and an electro-magnetic pickup 20 is disposed in such a manner that it faces the gear 19, Thus, the gear 19 and the electro-magnetic pickup 20 constitute means for detecting rotating numbers of the traverse cam, and the rotating numbers Nt of the traverse cam is detected, by the electro-magnetic pickup 20. [0031] Further, as illustrated in Fig. 2, the contact rollers 8 and 8' have gears 21 and 21' for detecting rotation of the contact rollers 8 and 8' mounted at the ends thereof opposite to the machine frame 5, and electro-magnetic pickups 22 and 22' are disposed in such a manner that they face the gears 21 and 21' . Thus, the gears 21 and 21' and the electro-magnetic pickups 22 and 22' constitute means for detecting rotalling numbers of the contact rollers 8 and 8' . The rotating numbers Nc and Nc' of the contact rollers 8 and 8' are detected by the electro-magnetic pickups 22 and 22' . [0032] As described above, the control of the outputs from each inverter 13, 13 or 18 is done based on the instruction from the controller 21, arvd the controller 23 is supplied with signals from the electro-magnetic pickups 15, 15' , 20, 21, 21' , i.e., the rotating numbers Nc and Nc' of the contact rollers 6 and 8' , the rotating numbers Nt of the traverse cam 9 and the rotating numbers Nb and Nb' of the bobbin holders 1 and 1' , [0033] The winding speed of the yarns Y and Y can be detected by detecting and calculating the rotating numbers Nc and Nc' of the contact rollers 8 and 8' , Accordingly, due to the above- described construction, when the diameter of the contact rollers 8 and 8' is Dc, the winding speed VC is calculated as follows, Ve=Ncs Π X Dc (1) ; the winding angle of the yarn wound onto the packages P and P' is calculated as follows using the winding speed Vc and the traverse speed Vtf which is obtained by detecting the rotating numbers Nt of the traverse cam 9, winding angle θ = tan-1(Vt/Vc) (2); and the diameter D of the wound package is obtained as follows - 9 - using the winding speed Vc, and the rotating numbers Nb and Nb of the bobbin holders, D = Vc/π /Mb (or Nb' ) (3), [0034] Now referring to Fig, 3, traverse control method for avoiding ribbon wind will now be explained. Information which is needed Lo wind yarn, such as winding speed V, winding angle θ , traverse stroke S, wind ratio W for avoiding the ribbon wind, is input into the controller 23, Lhe relationship between the wound diameter D of package and the winding angle 0 is calculated, as illustrated in Fig. 3. [0035] More specifically, Pig. 3 will now explained, the lines indicated by Wl and W2, wherein suffix l shows the condition under the package diameter D1 and suffix 2 shows the condition under the package diameter D2, show lines on which the wind ratio w, which is defined as W=23/π /D/tan 0 , becomes an integral number, the suffix being omitted here. When Lhe winding condition of the winding device positions on the lines WI or VS2, ribbon wind is generated by yarns which form a plurality of turns on the packages, in other words, the yarns are returned at both the ends of the package and are traversed onto the package directly locate one above the other. [0036] Reference numeral "δ " indicates width for avoiding ribbon wind which is obtained in consideration of errors in package diameters in winding and so on and which is obtained by taking a predetermined range relative to the wind ratio. Accordingly, lowermost wind ratio for avoiding ribbon wind, i.e., lowermost avoiding line L1' , for the wind ratio Wl which has to be avoided becomes, W1-δ and, uppermost wind ratio for avoiding ribbon wind, i.e., uppermost avoiding line L1, for the wind ratio Wl becomes, W1 + δ , Similarly, the uppermost and lower most avoiding lines L2 and L2' can be obtained for the wind ratio W2 which has to be avoided. - 10 - [0037] AS a result, the areas of the wind ratio to. toe avoided during winding are Wa1 and Wa2 which are hatched in Fig. 3. These areas Wa1 and wa2 will be referred to as "ribbon wind avoiding areas" in the following explanation. [0038] When packages P and P' are wound while the number of traverse is set constant, the rotating numbers of bobbin holders decrease as the package diameter D increases, and the wind ratio, i.e., the rotating number of the bobbin holder/traverse number, varies along line "a" in Fig. 3. When the wind ratio reaches the uppermost avoiding line L1, where the package diameter is D1 and the winding angle is θ 0' the rotating number of the traverse motor is increased at the the package diameter D1 in order to avoid winding within the ribbon wind avoiding area Wa1 so that wind ratio becomes on the lowermost avoiding line L1. Thus, the ribbon wind is avoided, and the winding angle increases to 0 a. It is preferred that the rotating number of the traverse motor is quickly increased from the uppermost avoiding line L1 to the lowermost avoiding line L1' so as to minimize the winding time within the ribbon wind avoiding area Wa1 as short as possible. [0039] Thereafter, between the package diameter D1 and D2, the winding angle is gradually lowered from the winding angle θ a toward the intersection between the winding angle θ 0 and the uppermost avoiding line L2 for package diameter D2 along the line "b"" [0040] Further, when the wind ratio reach the uppermost avoiding line L2, wherein the package diameter is D2, as the diameters of the package P and P' increase, the rotating number of the traverse motor is quickly increased similarly to the above- described explanation, and the wind ratio is varied to the lowermost avoiding line L2' , wherein the winding angle is θ b. The above-described traverse control is repeated during winding, winding within the ribbon wind avoiding areas Wa can be avoided until fully wound package is completed, and package free from ribbon wind can be obtained, - 11 - [0041] An actual embodiment of the present invention wherein winding of packages which are wound onto a plurality of bobbin holders is simultaneously controlled without generating ribbon wind will now be explained with reference to Figs. 1 and 4. [0042] In the case where the traverse control method for avoiding ribbon wind which has been explained with reference to Fig. 3 is carried out, when only the diameter of the package P which Is wound on either one, for example, bobbin holder 1, of bobbin holders 1 and 2 or 1' and 2' is detected as basis, and when the ribbon wind is avoided, there may occur difference in wound diameters in the horizontally separated packages, which are being wound, due to the difference in the thickness of the yarns Y and Y' which are being wound while sandwiching the traverse device, i.e., traverse cam 9, therebetween, due to the difference in the pressing pressures of the press rollers 8 and 8' , or due to the difference in the parallelism {errors In adjustment) between the bobbin holders l and 2 and the press rollers a and 8' . In such occasion, if avoiding of ribbon wind is done based on either one wound diameter wound on either one, for example bobbin holder 1, of bobbin holders, there is a probability that ribbon wind occurs in the package that is wound on the bobbin holder, the bobbin holder 2 in this embodiment, which is not used as basis of wound diameter, during winding operation, [0043] According to the present invention, a plurality of bobbin holders 1 and 2 are detected as basis, and when either one of them reaches the wind ratio to be avoided, the control of the traverse means, i.e., traverse cam 9, is performed so that all the bobbin holders 1 and 2 avoid the ribbon wind area. [0044] The step will now be explained. At the initial threading operation, beneath the spinnerets of the spinning machine, yarns Y are threaded onto feed rollers and yarn guides while they ire sucked into a suction device. Then, the yarns Y and Y' are threaded onto the bobbins 3 and 3' inserted onto the bobbin holders 1 and 1 by means of yarn threading device (not shown]. - 12 - The threading onto bobbins 3 and 3' may be done completely at the Same time, or may be done substantially at the same time, in Other words, done with time difference which does not cause any trouble. [Q0451 After completion of yarn threading, under the winding speed Vc, the relationship between the wound diameter D and the winding angle & is selected and winding operation is started, and winding within the ribbon wind avoiding areas Wa illustrated, in Fig. 4 is avoided. [0046] The winding speed Vc is obtained by detecting the rotating numbers Nc and Me' of the contact rollers 8 and 8; which are in contact with the packages P and P at a. predetermined pressure and using the above-described equation (1). [0047] The diameter D of the wound package is calculated at the controller 23 using the above-deseribed equation. (3} by the rotating, numbers Nb and Nb' of this bobbin holders 1 and. 1" and the winding speed Vc calculated as described above. [O043J Further, the winding speed Vc is maintained at a constant Speed by outputting frequencies corresponding to the winding speed Vc and wound diameter D of the package into the inverter 13 and 13 . 10049] The winding angle 0 obtained by the above-described eguation {2) is controlled by controlling the reciprocating speed Of the sliders [0 and JO' , i.e., the rotating number of the traverse motor 17 which applies rotating force to the traverse cajn 9, relative to the winding speed Vc. [0050] Further, at the controller 23, the diameters D and D' of the packages which are obtained from the rotating numbers Kb and Nb' of the bobbin holders 1 and 1 are compared with each other from the start of winding operation, and the wind ratio corresponding to the diameters D and D' of the packages are also calculated. - 13 - [0051] Assuming that the diameter of the packages which are being wound are DO and DO' and that the difference in the wound diameters (DO - DO' ) is created. Under this condition, the winding is continued at a predetermined winding angle. Step (1) When the wind ratio for the larger package diameter becomes L1, in other words, when the wound diameter (in this embodiment D1) satisfies (W1+δ) = 2S/π /D1/tan θ 0. the traverse speed Vt is quickly increased to θ 1, which is obtained from (W2-δ)=2S/π/D1' /tan θ 1, so that the wind ratio of the smaller package diameter fin this embodiment Dl' } becomes L1' and so that avoiding of ribbon wind, i.e., ribbon jump, is done. [0052] When ribbon jump is done by quickly increasing the traverse speed Vt to the angle 0 1 which is obtained from the smaller package diameter as described above, the winding angle θ 1 after ribbon jump varies from the winding angle θ a which was previously determined in the controller 23 upon start of winding operation. In order to overcome this problem, in the controller 23, a line L1-2, which gradually lowers from the winding angle θ 1 after ribbon jump toward the intersection between the winding angle θ 0 and the uppermost avoiding line L2 as a target, is formed, and the winding angle is controlled along the line L1-2 until the package with larger wound diameter reaches the uppermost avoiding line L2. [0053] Step [2] Thereafter, the winding angle θ is controlled along the line L1-2, and when the wind ratio of the larger package diameter D becomes equal to L2 again, in other words, the wound diameter (in this embodiment D2) becomes equal to that obtained from (W2 + δ )=2S/Π /D2/tan θ 0, ribbon jump is done by quickly increasing the traverse speed Vt- until θ 2 which is obtained from - 14 - (W2-δ )-2S/Π/D2/tan θ 2 is achieved so that the wind ratio of the smaller package diameter (in this embodiment D2' ) becomes equal to L2' . [0054] Step (3) Similar to the above-described step (1), when ribbon Jump is done by quickly increasing the traverse speed Vt until 0 2 which is obtained from the smaller package diameter, the winding angle after ribbon jump varies from the winding angle θ b which was previously determined in the controller 23 upon start of Winding operation. In order to overcome this problem, in the controller 23, a line L2-3 which gradually lowers from the winding angle θ 2 after ribbon jump toward the intersection between the winding angle θ 0 and the uppermost avoiding line L3 inot shown) as a target, is formed, and the winding angle is controlled along the line L2-3 until the package with larger wound diameter reaches the uppermost avoiding line L3. [0055] If the above-described steps (l) to (3) are repeated, generation of ribbon wind during winding operation can be avoided. Further, since the wind ratio before avoiding the ribbon wind area is calculated based on the bobbin holder with the largest winding diameter in winding, and since the traverse speed Vt is increased until the wind ratio of the bobbin holder with the minimum winding diameter in winding after avoiding the tibbon wind area can avoid the ribbon wind area, winding free from ribbon wind is possible, even if the difference in wound diameters varies in winding or plus or minus of the difference in wound diameters changes. [0056] As it will be readily understood from the embodiment, when the difference in wound diameters exceeds a predetermined range, the traverse rotating number has to be largely increased, and the winding angle increases largely. It is generally recognised that such quick and large increase of the winding angle adversely influences upon the yarn quality, and accordingly, it is preferred that warning sound or warning signals are sent when, for example, difference in wound diameters - 15 - which results in the variation of not less than 1 in winding angles is generated through a certain ribbon jump. [0057] For example, when yarn threading operations are done simultaneously, detection of the following abnormalities is possible by calculating the package diameters in winding and by comparing the difference in packaged diameters. [0058] Difference in Denier in wound yarns: Difference in wound diameters increases, and Difference in wound diameters reverses. Abnormal contacting pressure: Difference in wound diameters increases largely. In the above-described embodiment, example using so called cam traverse as a traverse device is explained, however, in the present invention, rotary blade traverse 9a and 9a' way be used as a traverse device as illustrated in Figs. 5 and 6 . [0059] Further, as illustrated in Figs. 7 and 8, when there are a plurality of traverse devices 9 and 9' , the plurality of traverse devices may be controlled by a single traverse control device, for example, a construction, wherein that the plurality of traverse devices are connected to each other by means of a timing belt or gears and are driven by a single motor, is applied, and by carrying out the present invention, packages free from ribbon wind can be formed even when the single motor is commonly used. Thus, the numbers of inverters and motors which are relatively expensive can be reduced, and equipment cost can be decreased. When it is difficult to commonly use one single traverse motor due to problems of space and so on, only inverter may be commonly used and the present invention can be carried out, Thus, the number of inverters can be reduced, and equipment cost can be decreased. [0060] Although in the above-described embodiment, a line for a new winding angle was formed using package with larger wound diameter as basis from just after avoiding ribbon wind to just before avoiding ribbon wind, a line for a new winding angle may - 16 - be formed using package with smaller wound diameter as basis. Further, although the winding angle line was set by a straight line, it may be varied along a saw tooth line, for example, as illustrated in Fig. 9 since the change will not adversely affect on the present invention. [Brief Description of the drawings] [0061] (Fig.1) It shows a schematic view showing construction of an embodiment of the winding device according to the present invention; [Fig. 2] It is a view seen in a direction of arrow X in Fig. 1, a part of which is omitted; [Fig. 3] It is an explanatory view of method for avoiding ribbon wind; [Fig. 4] It is an explanatory view of method of the present invention for avoiding ribbon wind; [Fig. 5] It is a schematic view of an embodiment of the present invention of winding device using rotary blade traverse; [Fig, 6] It is a view of Fig. 5 in a manner similar to Fig. 2; [Fig. 7] It is a schematic view of an embodiment of the present invention of winding device provided with a plurality of traverse devices; [Fig. 8] It is a view of Fig. 7 in a manner similar to Fig. 2; and [Fig. 9] It is an explanatory view of another method for avoiding ribbon wind of the present invention. [Explanation of Reference Numerals] [0062] 1, l' , 2 , 2' bobbin holders - 17 - 4, 4' turret tables 5 machine frame 6 slide rail 7 vertically movable frame 8, 8' contact roller 9, 9' traverse cam 9a, 9a' rotary blade traverse 10, 10' slider 11, 11' drive shaft 12, 12' motor for driving bobbin holder 13, 13' , 18 Inverter 14, 14' gear for detecting rotation of bobbin holder 15, 15' 20, 22, 22' electrc—magnetic pickup 17 traverse motor 19 gear for detecting rotation of traverse cam 21, 2l' gear for detecting rotation of contact roller 23 contact roller Nb, Nb' rotating number of holder NC, NC' rotating number of contact roller Nt rotating number of traverse cam Y, Y' yarn P, P' Package - 18 - What we claim: [claim 1] A yarn winding method wherein bobbins are fitted on bobbin holders, packages are wound on the bobbins installed on the bobbin holders while traversing the yarns by traverse means, and when the bobbin holders reach a specified wind ratio, a traverse speed in winding is increased so that the wind ratio can avoid a ribbon wind area, characterized in that a single common traverse means is installed for the plurality of bobbin holders so that packages are simultaneously wound on the plurality of bobbin holders, and when any of the plurality of bobbin holders reaches a wind ratio that must be avoided, the traverse means is controlled so that all the bobbin holders can avoid the ribbon wind area. [Claim 2] A yarn winding method according to claim 1 wherein the wind ratio before avoiding the ribbon wind area is calculated based on the bobbin holder with the largest winding diameter in winding, and the wind ratio after avoiding the ribbon wind area is so set that the bobbin holder with the minimum winding diameter in winding avoids the ribbon wind area. [Claim 3] A yarn winding method according to claim 1 or 2 wherein the wind ratio before avoiding the ribbon wind area and the wind ratio after avoiding the ribbon wind area are compared with each other, and when the difference in winding angles of the wound packages exceeds a predetermined amount, warning signals are sent. [Claim 4] A yarn winding method according to any one of claims 1 to 3 wherein said traverse means comprises a single traverse device disposed commonly for said plurality of bobbin holders and a traverse control device for controlling said single traverse device. [Claim 5] A yarn winding method according to any one of claims 1 to 3 wherein said traverse means comprises a plurality of traverse devices disposed for said plurality of bobbin holders, respectively, and a traverse control device for controlling said plurality of traverse devices. [Claim 6] A yarn winding device wherein bobbins are fitted on bobbin holders, packages are wound on the bobbins installed on - 19 - the bobbin holders while traversing the yarns by traverse means, and when the bobbin holders reach a specified wind ratio, a traverse speed in winding is increased so that the wind ratio can avoid a ribbon wind area, characterised in that a plurality of bobbin holders on which winding of packages are simultaneously performed are disposed, and a single common traverse means is installed for the plurality of bobbin holders, and said traverse means comprises a traverse device and a traverse control device for controlling said traverse device, whereby said traverse control device controls said traverse device so that all the bobbin holders can avoid the ribbon wind area svhen any of the plurality of bpbbin holders reaches a wind ratio that must be avoided. [Claim 7] A yarn winding device according to claim 6 wherein the wind ratio before avoiding the ribbon wind area is calculated based on the bobbin holder with the largest winding diameter in winding, and the wind ratio after avoiding the ribbon wind area is so set that the bobbin holder with the minimum winding diameter in winding avoids the ribbon wind area. [claim 8] A yarn winding devies according to claim 6 or 7 wherein the wind ratio before avoiding the ribbon wind area and. the wind ratio after avoiding the ribbon wind area are compared with each other, and when the difference in winding angles of the wound packages exceeds a predetermined amount, warning signals are sent. [Claim 9] A yarn winding devise according to any one of claims 6 to 8 wherein said traverse means comprises a single traverse device disposed commonly for said plurality of bobbin holders and a traverse control device for controlling said single traverse device. [Claim 10] A yarn winding device according to any one of claims 6 to 8 wherein said traverse means comprises a plurality of traverse devices disposed for said plurality of bobbin holders, respectively, and a traverse control device for controlling said plurality of traverse devices. A yarn winding method and a yarn winding device capable of avoiding the ribbon wind for all bobbin holders even if a difference in winding diameter occurs in any of packages while yarns are wound on a plurality of bobbin holders by one traverse means. In the yarn winding device wherein bobbins (3) and (3) are fitted on the bobbin holders (1) and (2), the packages (P) and (p) are wound on the bobbins installed on the bobbin holders while traversing the yarns (Y) and (Y) by a traverse cam (9), and wherc any of the bobbin holders reaches a specified wind ratio, a traverse speed In winding is increased so that the wind ratio can avoid a ribbon wind area. The yarn winding device comprises the plurality of bobbin holders whereby the windings of the packages are performed simultaneously and the single common traverse means installed for the plurality of bobbin holders. When the bobbin holder with the largest winding diameter in winding among the plurality of bobbin holders reaches the wind ratio that must be avoided, the traverse speed is increased so that the bobbin holfiei with the minimum winding diameter can avoid the ribbon wind area so as to Keep all the bobbin holders away from the ribbon wind area.

Full Text

A Yarn Minding Method and a Yarn Winding Device
(Technical Field)
[000l]
The present invention relates to a yarn winding method
and a yarn vending device, and more specifically, it relates to a
yarn winding method and a yarn winding device wherein bobbins are
fitted on bobbin holders., packages are wound on the bobbins
installed on the bobbin holders while traversing the yarns by
traverse means, and when the bobbin holders reach a specified
wind ratio, a traverse speed, in winding is increased so that, the
wind raLia can Avoid s ribbon wind area.
(Background Art)
[0002]
Generally, in a procedure wherein a yarn is wound at a
high speed onto a bobbin holder so as to form a package, when the
"wind ratio", which is defined as ratio between the rotational
speed of the bobbin holder and the number, of traverse, becomes an
integral number or an integral number + 1/2, so called ribbon
wind is generated because yarns, which ate returned at both the
ends of the package and which are traversed onto the package,
i.e., the yarn which was wound at previous traverse time and the
yarn which will be wound at next traverse time, directly locate
one above the other,
[0003]
When ribbon wind causes, such problems may occur that
wound yarn density and mass distribution in the package become
non-uniform, that vibration may cause during winding of package,
that yarn breakage or collapae of package occurs, and in the
later process, there may occur such a problem that withdrawal Of
yarn from package cannot done smoothly.
(0004)
In order to obviate the above—described problems, method
for avoiding the ribbon wind generating area, i.e., ribbon wind
area, is generally carried out wherein the traverse speed Vt is
rapidly increased near the wind ratio so that the wind ratio does
not become an integral number.
- 1 -

[0005]
In recent years, in order to Increase production, there
is a tendency to apply multi-ends by combining a plurality of
winding machines.
[0006]
for example, Patent Reference 1, i.e., Japanese Patent
Application Laid-open Mo. 2002-515388. discloses that two turret
tables are arranged vertically on one machine frame, and unite
constructed by them are arranged symmetrically in a horizontal
direction.
[0007]
Further, the present applicant proposed in Patent
Reference 2, i.e., Japanese Patent Application No. 2002-033760,
in order to increase space efficiency and to reduce the equipment
cost, a revolving type automatic yarn winding machine comprising
a turret table rotatable about a rotating center and having at
least two bobbin holders ratatably mounted thereon, a press
roller and a traverse device disposed upstream along a yarn
passage relative to the bobbin holder, wheraby a bobbin installed
on one bobbin holder is switched to a bobbin installed on the
other bobbin holder when the yarn wound, on the bobbin reaches a
predetermined amount characterized in that said turret, tables are
disposed on both sides of the yarn passage, respectively, the
rotating directions of one turret table and the other turret
table are opposed to each other, and the rotating directions of
the press roller installed correspondingly to the one turret,
table and the press roller installed correspondingly to the other
turret table are opposed to each other, and the press rollers and
a traverse device ars positioned above the rotating centers of
the turret tables,
[0008]
in the winding machine disclosed in Patent Reference 2,
traverse devices may be disposed for the bobbin holders mounted
on the two turret tables, respectively, so that packages are
wound on the bobbin holders mounted on the two turret tables, and
alternatively, a common single traverse device may be disposed
far the bobbin holders mounted on the two turret tables so that
yarns are traversed by the single traverse device and SO that
- 2 -

packages are wound on the bobbin holders mounted on the two
turret tables.
[Patant Reference l] Japanese Patent Application Laid-
open No. 2002-515388
[Patent Reference 2] Japanese patent Application N0.
2002-033760
[Disclosure of the Invention]
[Problems to Be Solved by the invention]
[0009]
The above-described Patent Reference 2 does not includes
detailed description regarding the traverse control. However, In
actual, the diameter of the package being wound on either one of
two bobbin holders is detected as basis so as to avoid ribbon
wind area.
[0010]
However, especially when a common single traverse device
is disposed for the bobbin holders mounted on the two turret
tables and when yarns are traversed by the single traverse device
so as to form packages on the two bobbin holders, there may occur
difference in wound diameters in the horizontally separated
packages which are being wound due to the difference in the
thickness of the yarns which are being wound while sandwiching
the traverse device therebetween, due to the difference in the
pressing pressures of the press rollers, or due to the difference
in the parallelism (errors in adjustment) between the bobbin
holders and the press rollers, in such occasion, since there is
one single traverse device, if avoiding of ribbon wind is done
based on either one wound diameter, there is a probability that
ribbon wind occurs in either one of packages, especially that
wound on the bobbin holder which is not used as basis of wound
diameter, during winding operation.
[0011]
It is an object of the present invention to obviate such
problems. Further, it is another object of the present invention
to provide a yarn winding method and device by which ribbon wind
can be avoided for all the bobbin holders even when there occurs
difference in wound diameters in packages, which are being wound
on a plurality of bobbin holders while a single traverse device
- 3 -

is used,
[0012]
Further, it is another object of the present invention to
provide a yarn winding method and device, which can be carried
out in such a yarn winding device as disclosed in the above-
described Patent Reference 1 or 2, by which ribbon wind can be
avoided, which winds packages with almost uniform yarn wound
density and almost uniform mass distribution, by which vibration,
yarn breakage, or collapse of package dose not occur during
package winding operation, and which can wind yarn packages with.
good withdrawal efficiency at a later process,
[Means to solve the Problems]
[0013]
According to the present invention, the above-described
objects are achieved by a yarn winding method wherein bobbins are
fitted on bobbin holders, packages are wound on the bobbins
installs-d on the bobbin holders while traversing the yarns by
traverse means, and when the bobbin holders reach a specified
wind ratio, a traverse speed in winding is increased so that the
wind ratio can avoid a ribbon wind area, characterised in that
a single common traverse means is installed for the
plurality of bobbin holders so that packages are simultaneously
wound on the plurality of bobbin holders, and
when any of the plurality of bobbin holders reaches a
wind ratio that must be avoided, the traverse means is controlled
so that all the bobbin holders can avoid the ribbon wind area.
[0014]
Further, according to the present invention, the above-
described objects are achieved by a yarn winding device wherein
bobbins are fitted on bobbin holders, packages are wound on the
bobbins installed on the bobbin holdets while traversing the
yarns by traverse means, and when the bobbin holders reach a
specified wind ratio, a traverse speed in winding is increased so
that the wind ratio can avoid a ribbon wind area, characterized
in that
a plurality of bobbin holders on which winding of
packages are simultaneously performed are disposed, and a single
Common traverse means is installed for the plurality of bobbin
- 4 -

holders, and
said, traverse means comprises a traverse device and a
traverse control device for controlling said, traverse device,
whereby said traverse control device controls said traverse
device, so that all the bobbin holders can avoid the ribbon wind
area when any of the plurality of bobbin holders resches a wind
ratio that must be avoided.
[0015]
In these occasions, it is preferred that the wind ratio
before avoiding the ribbon wind area is calculated based on the
bobbin holder with the largest winding diameter in winding, and
that the wind ratio after avoiding the ribbon wind area is so set
that the bobbin holder with the minimum winding diameter in
winding avoids the ribbon wind area.
[0016]
Further, it is preferred that the wind ratio before
avoiding the ribbon wind area and the wind ratio aftes avoiding
the ribbon wind area are compared with each other, and that when
the difference in winding angles of the wound packages exceeds a
predetermined amount, warning signals are sent.
[0017]
According to the present invention, the traverse means
may ccmprise a single traverse device disposed eommonly for a
plurality of bobbin holders and a traverse control device for
controlling the single traverse device. Alternatively, according
to the present invention, said traverse means may comprise a
plurality of traverse devices disposed for said plurality of
bobbin holders, respectively, and a traverse control device fp.t
controlling said plurality of traverse devices.
[0018]
According to the present invention, even such a
construction as disclosed in Patent Reference 1, i,e., Japanese
Patent Application Laid-open No, 2002-515383, is used, ribbon
wind of packages being wound on all the bobbin holders by means
of a single traverse device, i.e., a traverse motor, can be
avoided.
[0019]
According to the present invention, even in a revolving
- 5 -

type automatic winding device having a construction as disclosed
in Patent Reference 2, i.e., Japanese Patent Application No. 2002-
033760, packages which are free from ribbon wind can be forced.
[Advantages of the Invention]
[0020]
According to the present, invention, a yarn winding method
and device ana provided, by which ribbon wind, for all the bobbin
holders can be avoided even if difference in wound diameters
occurs in any one of the package while yarns are wound on a
plurality of bobbin holders by means of one single traverse
device.
Further, according to the present invention, a yarn
winding method and device are provided, by which ribbon wind can
be avoided, which winds packages with almost uniform yarn wound
density and almost uniform mass distribution, by which vibration,
yarn breakage, or collapse of package does not occur during
package winding operation, and by which yarn packages with good
withdrawal efficiency at a later process can be wound.
[Best Mode for Carrying out the Invention]
[0021]
The present invention will now be described in detail
with reference to the accompanying drawings wherein some
embodiments of the present invention are illustrated, wherein
Fig.l shows a schematic view showing construction of an
embodiment of the winding device according to the present
invention, and Fig. 2 is a view seen in a direction of arrow X, a
part of which is omitted.
[0023]
In Figs. 1 and 2, two circular disk shaped turret tables
4 and 4' are ratatably mounted on the front surface of a machine
frame 5 in such condition that their parallel central axes are
horizontally spaced with each other, and each of turret tables 4
and 4' is rotatable about the respective axis by means of a
rotating motor (not shown).
[0023]
The ends negr the machine frame of bobbin holders 1, 1' ,
2 and 2' are rotatably mounted on the turret tables 4 and 4' , and
bobbin holders 1, l' , 2 and 2' extend from the turret tables 4
- 6 -

and 4' in a direction perpendicular to the sheet on which Fig. 1
is drawn.
[0024]
The bobbin holders 1, 1' , 2 and 2' have a plurality of
bobbins 3 and 3' mounted thereon, respectively, and the bobbins 3
and 3' rotate together with the bobbin holders 1, 1' , 2 and 2' so
as to wind yarns Y and Y' on the peripheries of the bobbins 3 and
3' and to form a plurality of packages P and P' .
[0025]
More specifically, in Fig. 2, the bobbin holders 1, l' ,
are connected to bobbin holder driving motors 12 and 12' via
drive shafts 11 and 11 , and the motors 12 and 12' rotate at a
rotating speed corresponding to the output from inverters 13 and
13' which are controlled by a controller 23 so as to drive the
bobbin holders so that in Fig. 1, the bobbin holder 3 mounted on
the right turret table A is rotated in a clockwise direction
while
the bobbin holder 3' mounted on the left turret table 4' is
rotated in a counter-clockwise direction. Although the driving
system of the bobbin holders 2 and 2' are similarly constructed,
in order to simplify the explanation, the description of the
bobbin holders 2 and 2' in this embodiment is omitted.
The motors 12 and 12' have gears 14 and 14' ,
respectively, for detecting rotation of the bobbin holders
mounted at the ends thereof opposite to the bobbin holders 1 and
X' , and electro-magnetic pickups 15 and 15' are disposed in such
a manner that they face the gears 14 and 14' respectively. Thus,
the gears 14 and 14' and the electro-magnetic pickups 15 and 15'
constitute means for detecting rotating numbers of the bobbin
holders, and the rotating numbers Nb and Nb' of the bobbin
holders 1 and 1' are detected by the electro-magnetic pickups 15
and 15' and are input into a controller 23,
[0026]
Referring to Fig. 1 again, when the packages P and p' ,
which have been wound on the bobbins 3 and 3' inserted onto the
bobbin holder 1 end 1' , reach a predetermined amount, the turret
table 4 and 4' are rotated in directions indicated by arrows in
Fig, 1, more specifically, the right turret table 4 is rotated in
- 7 -

a clockwise direction and the left turret table 4' is rotated in
a counter-clockwise direction, the bobbin holders 1 and 1' , on
which yarns have been wound, are switched to the bobbin holders 2
and 2' , onto which empty bobbins 2 and 3' are inserted, and yarns
can be continuously wound on the bobbins 3 and 3' which are
inserted onto the bobbin holders 2 and 2 without repeating the
initial yarn threading operation which is effected at the start
ot winding.
The machine frame 5 has two slide rails 6 vertically
disposed therein, and a vertically movable frame 7 is lifted and
lowered along the slide rails 6 by means of a fluid pressure
cylinder (not shown).
[0028]
The vertically movable frame 7 has two contact rollers 3
and 8' rotatably mounted thereon, and the contact rollers 8 and 8'
contact with and rotate the packages P and P' and apply a
predetermined contacting pressure to the packages P and P' so as
to form the shape and enhance the package hardness of the
packages P and P .
[0029]
A traverse cam 9 is arranged between the two contact
rollers 8 and 8' and is rotatably mounted on the vertically
movable frame 7. The traverse cam 9 has cam grooves formed on
the periphery thereof, and two sliders 10 and 10 are engaged
With the cam grooves, which sliders reciprocalingly move yarns in
a direction of the bobbins due to the rotation of the traverse
cam 9, and the sliders 10 and 10' face the contact rollers, 6 and
8' , respectively.
[0030]
In Fig. 2, the traverse cam 9 is connected to a traverse
motor 17 via a drive shaft 16, and the traverse motor 17 rotates
the traverse cam 9 at a rotating speed which depends on the
output of the inverter 18 which is controlled by the controller
23. Accordingly, the rotating speed of the traverse cam 9 is
determined by the output of the inverter 18. Farther, the
traverse motor 17 has a gears 19 for detecting rotation of the
traverse cam mounted at the ends thereof near the traverse cam
- 8 -

16, and an electro-magnetic pickup 20 is disposed in such a
manner that it faces the gear 19, Thus, the gear 19 and the
electro-magnetic pickup 20 constitute means for detecting
rotating numbers of the traverse cam, and the rotating numbers Nt
of the traverse cam is detected, by the electro-magnetic pickup
20.
[0031]
Further, as illustrated in Fig. 2, the contact rollers 8
and 8' have gears 21 and 21' for detecting rotation of the
contact rollers 8 and 8' mounted at the ends thereof opposite to
the machine frame 5, and electro-magnetic pickups 22 and 22' are
disposed in such a manner that they face the gears 21 and 21' .
Thus, the gears 21 and 21' and the electro-magnetic pickups 22
and 22' constitute means for detecting rotalling numbers of the
contact rollers 8 and 8' . The rotating numbers Nc and Nc' of the
contact rollers 8 and 8' are detected by the electro-magnetic
pickups 22 and 22' .
[0032]
As described above, the control of the outputs from each
inverter 13, 13 or 18 is done based on the instruction from the
controller 21, arvd the controller 23 is supplied with signals
from the electro-magnetic pickups 15, 15' , 20, 21, 21' , i.e., the
rotating numbers Nc and Nc' of the contact rollers 6 and 8' , the
rotating numbers Nt of the traverse cam 9 and the rotating
numbers Nb and Nb' of the bobbin holders 1 and 1' ,
[0033]
The winding speed of the yarns Y and Y can be detected
by detecting and calculating the rotating numbers Nc and Nc' of
the contact rollers 8 and 8' , Accordingly, due to the above-
described construction, when the diameter of the contact rollers
8 and 8' is Dc, the winding speed VC is calculated as follows,
Ve=Ncs Π X Dc (1) ;
the winding angle of the yarn wound onto the packages P and P' is
calculated as follows using the winding speed Vc and the traverse
speed Vtf which is obtained by detecting the rotating numbers Nt
of the traverse cam 9,
winding angle θ = tan-1(Vt/Vc) (2);
and the diameter D of the wound package is obtained as follows
- 9 -

using the winding speed Vc, and the rotating numbers Nb and Nb
of the bobbin holders,
D = Vc/π /Mb (or Nb' ) (3),
[0034]
Now referring to Fig, 3, traverse control method for
avoiding ribbon wind will now be explained. Information which is
needed Lo wind yarn, such as winding speed V, winding angle θ ,
traverse stroke S, wind ratio W for avoiding the ribbon wind, is
input into the controller 23, Lhe relationship between the wound
diameter D of package and the winding angle 0 is calculated, as
illustrated in Fig. 3.
[0035]
More specifically, Pig. 3 will now explained, the lines
indicated by Wl and W2, wherein suffix l shows the condition
under the package diameter D1 and suffix 2 shows the condition
under the package diameter D2, show lines on which the wind ratio
w, which is defined as
W=23/π /D/tan 0 ,
becomes an integral number, the suffix being omitted here. When
Lhe winding condition of the winding device positions on the
lines WI or VS2, ribbon wind is generated by yarns which form a
plurality of turns on the packages, in other words, the yarns are
returned at both the ends of the package and are traversed onto
the package directly locate one above the other.
[0036]
Reference numeral "δ " indicates width for avoiding
ribbon wind which is obtained in consideration of errors in
package diameters in winding and so on and which is obtained by
taking a predetermined range relative to the wind ratio.
Accordingly, lowermost wind ratio for avoiding ribbon wind, i.e.,
lowermost avoiding line L1' , for the wind ratio Wl which has to
be avoided becomes,
W1-δ
and, uppermost wind ratio for avoiding ribbon wind, i.e.,
uppermost avoiding line L1, for the wind ratio Wl becomes,
W1 + δ ,
Similarly, the uppermost and lower most avoiding lines L2 and L2'
can be obtained for the wind ratio W2 which has to be avoided.
- 10 -

[0037]
AS a result, the areas of the wind ratio to. toe avoided
during winding are Wa1 and Wa2 which are hatched in Fig. 3.
These areas Wa1 and wa2 will be referred to as "ribbon wind
avoiding areas" in the following explanation.
[0038]
When packages P and P' are wound while the number of
traverse is set constant, the rotating numbers of bobbin holders
decrease as the package diameter D increases, and the wind ratio,
i.e., the rotating number of the bobbin holder/traverse number,
varies along line "a" in Fig. 3. When the wind ratio reaches the
uppermost avoiding line L1, where the package diameter is D1 and
the winding angle is θ 0' the rotating number of the traverse
motor is increased at the the package diameter D1 in order to
avoid winding within the ribbon wind avoiding area Wa1 so that
wind ratio becomes on the lowermost avoiding line L1. Thus, the
ribbon wind is avoided, and the winding angle increases to 0 a.
It is preferred that the rotating number of the traverse motor is
quickly increased from the uppermost avoiding line L1 to the
lowermost avoiding line L1' so as to minimize the winding time
within the ribbon wind avoiding area Wa1 as short as possible.
[0039]
Thereafter, between the package diameter D1 and D2, the
winding angle is gradually lowered from the winding angle θ a
toward the intersection between the winding angle θ 0 and the
uppermost avoiding line L2 for package diameter D2 along the line
"b""
[0040]
Further, when the wind ratio reach the uppermost avoiding
line L2, wherein the package diameter is D2, as the diameters of
the package P and P' increase, the rotating number of the
traverse motor is quickly increased similarly to the above-
described explanation, and the wind ratio is varied to the
lowermost avoiding line L2' , wherein the winding angle is θ b.
The above-described traverse control is repeated during winding,
winding within the ribbon wind avoiding areas Wa can be avoided
until fully wound package is completed, and package free from
ribbon wind can be obtained,
- 11 -

[0041]
An actual embodiment of the present invention wherein
winding of packages which are wound onto a plurality of bobbin
holders is simultaneously controlled without generating ribbon
wind will now be explained with reference to Figs. 1 and 4.
[0042]
In the case where the traverse control method for
avoiding ribbon wind which has been explained with reference to
Fig. 3 is carried out, when only the diameter of the package P
which Is wound on either one, for example, bobbin holder 1, of
bobbin holders 1 and 2 or 1' and 2' is detected as basis, and
when the ribbon wind is avoided, there may occur difference in
wound diameters in the horizontally separated packages, which are
being wound, due to the difference in the thickness of the yarns
Y and Y' which are being wound while sandwiching the traverse
device, i.e., traverse cam 9, therebetween, due to the difference
in the pressing pressures of the press rollers 8 and 8' , or due
to the difference in the parallelism {errors In adjustment)
between the bobbin holders l and 2 and the press rollers a and 8' .
In such occasion, if avoiding of ribbon wind is done based on
either one wound diameter wound on either one, for example bobbin
holder 1, of bobbin holders, there is a probability that ribbon
wind occurs in the package that is wound on the bobbin holder,
the bobbin holder 2 in this embodiment, which is not used as
basis of wound diameter, during winding operation,
[0043]
According to the present invention, a plurality of bobbin
holders 1 and 2 are detected as basis, and when either one of
them reaches the wind ratio to be avoided, the control of the
traverse means, i.e., traverse cam 9, is performed so that all
the bobbin holders 1 and 2 avoid the ribbon wind area.
[0044]
The step will now be explained. At the initial threading
operation, beneath the spinnerets of the spinning machine, yarns
Y are threaded onto feed rollers and yarn guides while they ire
sucked into a suction device. Then, the yarns Y and Y' are
threaded onto the bobbins 3 and 3' inserted onto the bobbin
holders 1 and 1 by means of yarn threading device (not shown].
- 12 -

The threading onto bobbins 3 and 3' may be done completely at the
Same time, or may be done substantially at the same time, in
Other words, done with time difference which does not cause any
trouble.
[Q0451
After completion of yarn threading, under the winding
speed Vc, the relationship between the wound diameter D and the
winding angle & is selected and winding operation is started,
and winding within the ribbon wind avoiding areas Wa illustrated,
in Fig. 4 is avoided.
[0046]
The winding speed Vc is obtained by detecting the
rotating numbers Nc and Me' of the contact rollers 8 and 8; which
are in contact with the packages P and P at a. predetermined
pressure and using the above-described equation (1).
[0047]
The diameter D of the wound package is calculated at the
controller 23 using the above-deseribed equation. (3} by the
rotating, numbers Nb and Nb' of this bobbin holders 1 and. 1" and
the winding speed Vc calculated as described above.
[O043J
Further, the winding speed Vc is maintained at a constant
Speed by outputting frequencies corresponding to the winding
speed Vc and wound diameter D of the package into the inverter 13
and 13 .
10049]
The winding angle 0 obtained by the above-described
eguation {2) is controlled by controlling the reciprocating speed
Of the sliders [0 and JO' , i.e., the rotating number of the
traverse motor 17 which applies rotating force to the traverse
cajn 9, relative to the winding speed Vc.
[0050]
Further, at the controller 23, the diameters D and D' of
the packages which are obtained from the rotating numbers Kb and
Nb' of the bobbin holders 1 and 1 are compared with each other
from the start of winding operation, and the wind ratio
corresponding to the diameters D and D' of the packages are also
calculated.
- 13 -

[0051]
Assuming that the diameter of the packages which are
being wound are DO and DO' and that the difference in the wound
diameters (DO - DO' ) is created. Under this condition, the
winding is continued at a predetermined winding angle.
Step (1)
When the wind ratio for the larger package diameter
becomes L1, in other words, when the wound diameter (in this
embodiment D1) satisfies
(W1+δ) = 2S/π /D1/tan θ 0.
the traverse speed Vt is quickly increased to θ 1, which is
obtained from
(W2-δ)=2S/π/D1' /tan θ 1,
so that the wind ratio of the smaller package diameter fin this
embodiment Dl' } becomes L1' and so that avoiding of ribbon wind,
i.e., ribbon jump, is done.
[0052]
When ribbon jump is done by quickly increasing the
traverse speed Vt to the angle 0 1 which is obtained from the
smaller package diameter as described above, the winding angle θ
1 after ribbon jump varies from the winding angle θ a which was
previously determined in the controller 23 upon start of winding
operation. In order to overcome this problem, in the controller
23, a line L1-2, which gradually lowers from the winding angle θ
1 after ribbon jump toward the intersection between the winding
angle θ 0 and the uppermost avoiding line L2 as a target, is
formed, and the winding angle is controlled along the line L1-2
until the package with larger wound diameter reaches the
uppermost avoiding line L2.
[0053]
Step [2]
Thereafter, the winding angle θ is controlled along the
line L1-2, and when the wind ratio of the larger package diameter
D becomes equal to L2 again, in other words, the wound diameter
(in this embodiment D2) becomes equal to that obtained from
(W2 + δ )=2S/Π /D2/tan θ 0,
ribbon jump is done by quickly increasing the traverse speed Vt-
until θ 2 which is obtained from
- 14 -

(W2-δ )-2S/Π/D2/tan θ 2
is achieved so that the wind ratio of the smaller package
diameter (in this embodiment D2' ) becomes equal to L2' .
[0054]
Step (3)
Similar to the above-described step (1), when ribbon Jump
is done by quickly increasing the traverse speed Vt until 0 2
which is obtained from the smaller package diameter, the winding
angle after ribbon jump varies from the winding angle θ b which
was previously determined in the controller 23 upon start of
Winding operation. In order to overcome this problem, in the
controller 23, a line L2-3 which gradually lowers from the
winding angle θ 2 after ribbon jump toward the intersection
between the winding angle θ 0 and the uppermost avoiding line L3
inot shown) as a target, is formed, and the winding angle is
controlled along the line L2-3 until the package with larger
wound diameter reaches the uppermost avoiding line L3.
[0055]
If the above-described steps (l) to (3) are repeated,
generation of ribbon wind during winding operation can be
avoided. Further, since the wind ratio before avoiding the
ribbon wind area is calculated based on the bobbin holder with
the largest winding diameter in winding, and since the traverse
speed Vt is increased until the wind ratio of the bobbin holder
with the minimum winding diameter in winding after avoiding the
tibbon wind area can avoid the ribbon wind area, winding free
from ribbon wind is possible, even if the difference in wound
diameters varies in winding or plus or minus of the difference in
wound diameters changes.
[0056]
As it will be readily understood from the embodiment,
when the difference in wound diameters exceeds a predetermined
range, the traverse rotating number has to be largely increased,
and the winding angle increases largely. It is generally
recognised that such quick and large increase of the winding
angle adversely influences upon the yarn quality, and
accordingly, it is preferred that warning sound or warning
signals are sent when, for example, difference in wound diameters
- 15 -

which results in the variation of not less than 1 in winding
angles is generated through a certain ribbon jump.
[0057]
For example, when yarn threading operations are done
simultaneously, detection of the following abnormalities is
possible by calculating the package diameters in winding and by
comparing the difference in packaged diameters.
[0058]
Difference in Denier in wound yarns:
Difference in wound diameters increases, and
Difference in wound diameters reverses.
Abnormal contacting pressure:
Difference in wound diameters increases largely.
In the above-described embodiment, example using so
called cam traverse as a traverse device is explained, however,
in the present invention, rotary blade traverse 9a and 9a' way be
used as a traverse device as illustrated in Figs. 5 and 6 .
[0059]
Further, as illustrated in Figs. 7 and 8, when there are
a plurality of traverse devices 9 and 9' , the plurality of
traverse devices may be controlled by a single traverse control
device, for example, a construction, wherein that the plurality
of traverse devices are connected to each other by means of a
timing belt or gears and are driven by a single motor, is
applied, and by carrying out the present invention, packages free
from ribbon wind can be formed even when the single motor is
commonly used. Thus, the numbers of inverters and motors which
are relatively expensive can be reduced, and equipment cost can
be decreased. When it is difficult to commonly use one single
traverse motor due to problems of space and so on, only inverter
may be commonly used and the present invention can be carried
out, Thus, the number of inverters can be reduced, and equipment
cost can be decreased.
[0060]
Although in the above-described embodiment, a line for a
new winding angle was formed using package with larger wound
diameter as basis from just after avoiding ribbon wind to just
before avoiding ribbon wind, a line for a new winding angle may
- 16 -

be formed using package with smaller wound diameter as basis.
Further, although the winding angle line was set by a straight
line, it may be varied along a saw tooth line, for example, as
illustrated in Fig. 9 since the change will not adversely affect
on the present invention.
[Brief Description of the drawings]
[0061]
(Fig.1)
It shows a schematic view showing construction of an
embodiment of the winding device according to the present
invention;
[Fig. 2]
It is a view seen in a direction of arrow X in Fig. 1, a
part of which is omitted;
[Fig. 3]
It is an explanatory view of method for avoiding ribbon
wind;
[Fig. 4]
It is an explanatory view of method of the present
invention for avoiding ribbon wind;
[Fig. 5]
It is a schematic view of an embodiment of the present
invention of winding device using rotary blade traverse;
[Fig, 6]
It is a view of Fig. 5 in a manner similar to Fig. 2;
[Fig. 7]
It is a schematic view of an embodiment of the present
invention of winding device provided with a plurality of traverse
devices;
[Fig. 8]
It is a view of Fig. 7 in a manner similar to Fig. 2; and
[Fig. 9]
It is an explanatory view of another method for avoiding
ribbon wind of the present invention.
[Explanation of Reference Numerals]
[0062]
1, l' , 2 , 2' bobbin holders
- 17 -

4, 4' turret tables
5 machine frame
6 slide rail
7 vertically movable frame
8, 8' contact roller
9, 9' traverse cam
9a, 9a' rotary blade traverse
10, 10' slider
11, 11' drive shaft
12, 12' motor for driving bobbin holder
13, 13' , 18 Inverter
14, 14' gear for detecting rotation of bobbin holder
15, 15' 20, 22, 22' electrc—magnetic pickup
17 traverse motor
19 gear for detecting rotation of traverse cam
21, 2l' gear for detecting rotation of contact roller
23 contact roller
Nb, Nb' rotating number of holder
NC, NC' rotating number of contact roller
Nt rotating number of traverse cam
Y, Y' yarn
P, P' Package
- 18 -

What we claim:
[claim 1] A yarn winding method wherein bobbins are fitted
on bobbin holders, packages are wound on the bobbins installed on
the bobbin holders while traversing the yarns by traverse means,
and when the bobbin holders reach a specified wind ratio, a
traverse speed in winding is increased so that the wind ratio can
avoid a ribbon wind area, characterized in that
a single common traverse means is installed for the
plurality of bobbin holders so that packages are simultaneously
wound on the plurality of bobbin holders, and
when any of the plurality of bobbin holders reaches a
wind ratio that must be avoided, the traverse means is controlled
so that all the bobbin holders can avoid the ribbon wind area.
[Claim 2] A yarn winding method according to claim 1
wherein the wind ratio before avoiding the ribbon wind area is
calculated based on the bobbin holder with the largest winding
diameter in winding, and the wind ratio after avoiding the ribbon
wind area is so set that the bobbin holder with the minimum
winding diameter in winding avoids the ribbon wind area.
[Claim 3] A yarn winding method according to claim 1 or 2
wherein the wind ratio before avoiding the ribbon wind area and
the wind ratio after avoiding the ribbon wind area are compared
with each other, and when the difference in winding angles of the
wound packages exceeds a predetermined amount, warning signals
are sent.
[Claim 4] A yarn winding method according to any one of
claims 1 to 3 wherein said traverse means comprises a single
traverse device disposed commonly for said plurality of bobbin
holders and a traverse control device for controlling said single
traverse device.
[Claim 5] A yarn winding method according to any one of
claims 1 to 3 wherein said traverse means comprises a plurality
of traverse devices disposed for said plurality of bobbin
holders, respectively, and a traverse control device for
controlling said plurality of traverse devices.
[Claim 6] A yarn winding device wherein bobbins are fitted
on bobbin holders, packages are wound on the bobbins installed on
- 19 -

the bobbin holders while traversing the yarns by traverse means,
and when the bobbin holders reach a specified wind ratio, a
traverse speed in winding is increased so that the wind ratio can
avoid a ribbon wind area, characterised in that
a plurality of bobbin holders on which winding of
packages are simultaneously performed are disposed, and a single
common traverse means is installed for the plurality of bobbin
holders, and
said traverse means comprises a traverse device and a
traverse control device for controlling said traverse device,
whereby said traverse control device controls said traverse
device so that all the bobbin holders can avoid the ribbon wind
area svhen any of the plurality of bpbbin holders reaches a wind
ratio that must be avoided.
[Claim 7] A yarn winding device according to claim 6
wherein the wind ratio before avoiding the ribbon wind area is
calculated based on the bobbin holder with the largest winding
diameter in winding, and the wind ratio after avoiding the ribbon
wind area is so set that the bobbin holder with the minimum
winding diameter in winding avoids the ribbon wind area.
[claim 8] A yarn winding devies according to claim 6 or 7
wherein the wind ratio before avoiding the ribbon wind area and.
the wind ratio after avoiding the ribbon wind area are compared
with each other, and when the difference in winding angles of the
wound packages exceeds a predetermined amount, warning signals
are sent.
[Claim 9] A yarn winding devise according to any one of
claims 6 to 8 wherein said traverse means comprises a single
traverse device disposed commonly for said plurality of bobbin
holders and a traverse control device for controlling said single
traverse device.
[Claim 10] A yarn winding device according to any one of
claims 6 to 8 wherein said traverse means comprises a plurality
of traverse devices disposed for said plurality of bobbin
holders, respectively, and a traverse control device for
controlling said plurality of traverse devices.

A yarn winding method and a yarn winding device capable
of avoiding the ribbon wind for all bobbin holders even if a
difference in winding diameter occurs in any of packages while
yarns are wound on a plurality of bobbin holders by one traverse
means. In the yarn winding device wherein bobbins (3) and (3)
are fitted on the bobbin holders (1) and (2), the packages (P)
and (p) are wound on the bobbins installed on the bobbin holders
while traversing the yarns (Y) and (Y) by a traverse cam (9),
and wherc any of the bobbin holders reaches a specified wind
ratio, a traverse speed In winding is increased so that the wind
ratio can avoid a ribbon wind area. The yarn winding device
comprises the plurality of bobbin holders whereby the windings of
the packages are performed simultaneously and the single common
traverse means installed for the plurality of bobbin holders.
When the bobbin holder with the largest winding diameter in
winding among the plurality of bobbin holders reaches the wind
ratio that must be avoided, the traverse speed is increased so
that the bobbin holfiei with the minimum winding diameter can
avoid the ribbon wind area so as to Keep all the bobbin holders
away from the ribbon wind area.

Documents:

« Previous Patent

Next Patent »

Patent Number

218536

Indian Patent Application Number

01474/KOLNP/2005

PG Journal Number

14/2008

Publication Date

04-Apr-2008

Grant Date

02-Apr-2008

Date of Filing

28-Jul-2005

Name of Patentee

TSTM CO. , LTD.

Applicant Address

51, MINAMIYOSHIDA-CHO 2798, MATSUYAMA-SHI, EHIME 791-8042,JAPAN

Inventors:

#	Inventor's Name	Inventor's Address
1	YOSHIOKA, SEIJI	C/O. TSTM CO., LTD. 51, MINAMIYOSHIDA-CHO 2798, MATSUYAMA-SHI, EHIME 791-8042,JAPAN
2	ISHIMARU, NORIKI	C/O. TSTM CO., LTD. 51, MINAMIYOSHIDA-CHO 2798, MATSUYAMA-SHI, EHIME 791-8042,JAPAN

PCT International Classification Number

B65H 54/38

PCT International Application Number

PCT/JP2004/001276

PCT International Filing date

2004-02-06

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	2003-031612	2003-02-07	Japan