Title of Invention

DEVICE FOR CONTROLLING A CREEL OF A TEXTILE MACHINE.

Abstract

DEVICE FOR CONTROLLING A CREEL OF A TEXTILE MACHINE. THE INVENTION RELATES TO A DEVICE FOR CONTROLLING A CREEL (12) OF A TEXTILE MACHINE, WHICH IS SEATED, PIVOTABLE TO A LIMKTEDDEGREE, BY MEANS OF A PIVOT SHAFT (14) AND IS LOADED WITH A TORQUE GENERATOR (24,28,30) WHICH, CONTROLLED BY A DRIVE MACHANISM (34), GENERATES A DEFINED TORQUE. IN ACCORDANCE WITH THE INVENTION, THE TORQUE GENERATOR (24,28,30) IS CONNECTED WITH THE CREEL (12) BY MEANS OF A REDUCTION GEAR STAGE (20,22 ; 60,62).

Full Text

Device for Controlling a Creel of a Textile Machine The invention relates to a device for controlling a creel of a textile machine, which is seated, pivotable to a limited degree, by means of a pivot shaft and can be loaded with a torque generator which, controlled by a drive mechanism, generates a defined torque. A device in accordance with the species for controlling a creel of a textile machine is described in DE 198 17 363 A1, for example. With this known device a bobbin held in a creel is driven by a roller by means of friction. It is intended here to provide an exactly predetermined bobbin contact pressure between the driving roller and the bobbin, which can be controlled in order to be able, for example, to set a defined slippage between the bobbin and the roller. Therefore the creel is seated, rotatable to a limited degree by means of a pivot shaft, wherein a connecting disk is connected, fixed against relative rotation, with the pivot shaft. Moreover, the connecting disk is connected by means of helical springs with a gear wheel in such a way that a rotation of the gear wheel by means of a drive motor, in particular a step motor, generates a torque acting on the connecting disk and therefore on the pivot shaft. In order to be able to introduce a sufficiently large torque into the pivot shaft, a total of six helical springs, which are arranged tangentially in respect to the pivot shaft, are provided between the gear wheel and the connecting disk. Based on the above mentioned prior art, the object of the invention is based on providing a device for the defined control of a creel, which is particularly effective and at the same time cost-effective and simple in construction, This object is attained in accordance with the invention in that the torque generator is connected with the creel by means of a reduction gear stage. This means that because of the employment of a eduction gear stage it is possible to design the torque generator relatively low-powered and simply. The high torque required for the defined control of the creel is nevertheless assuredly provided. As described hereinafter the torque generator advantageously has a flat spiral spring. By using a flat spiral spring it is possible to achieve a very simple, cost-effective construction of the entire device. For this purpose, one end of the flat spiral spring is fastened on a first element of the torque generator, which is displaced by the drive element. The other end of the flat spiral spring is connected with a second element, which is coupled with the gear. The flat spiral spring generates a defined force by the rotation of the first element in respect to the second element, which can be adjusted within wide margins since, because of its type of construction, the flat spiral spring can be rotated over a large angle, and this force is converted into torque. In an advantageous embodiment of the invention, the gear stage is embodied as a ribbon gear as desribed hereinafter. A generation of the torque free of play at the pivot shaft can be achieved with the aid ofa ribbon gear. This is advantageous in view of the exact control of the creel, and therefore in view of an exactly set bobbin contact pressure. In an alternative embodiment the torque generator can also be directly connected with a drive shaft of the drive element, which results in a direct control of the torque generator by means of the drive element. The numver of required components is reduced by this. As described hereinafter, it is provided in an advantageous embodiment of the invention that a further gear stage is arranged between the drive element and the torque generator. Thus, the torque generator is arranged between two gears, or between two gear stages, which results in an extremely flexible design of the device in accordance with the invention. For example, a low-powered and cost-effective step motor can be used as the drive motor. Further characteristic and advantages of the invention ensue from the subsequent description together with the accompanying drawings. Shown in the drawings are in: Fig. 1, a schematic representation of a lateral view of a device in accordance with the invention for controlling a creel in accordance with a first embodiment. Fig. 2, a schematic front view of the device in Fig. 1, Fig. 3, a lateral view of a ribbon drive in accordan :e with a second embodiment of the invention, and Fig. 4, a view from above on a ribbon drive in accordance with Fig. 3. A winding head housing 10 of a textile machine can be seen in the schematic representations in Figs. 1 and 2, on which a creel 12 is seated, rotatable in a limited manner, by means of a pivot shaft 14. A bobbin 16 is rotatably seated in the creel 12, which is driven by frictional force by a roller 18. In order to provided a predefined contact pressure of the bobbin 16 on nhe roller 18, the pivot shaft 14 of the creel 12 is charged with a defined, adjustable torque which, as a rule, acts by reducing the lo d on the creel 12. Such a predefined even contact pressure is very important in connection with producing cheeses, since otherwise not only the outer appearance of the bobbins, but also their unwinding behaviors, are negatively affected. However, in areas of pattern disruption, the introduction of a defined slippage between the bobbin 16 and the roller 18 is desirable, for which purpose the torque acting on the creel 12 is increased and the contact pressure of the bobbin 16 on the ribbon 18 is definitely reduced by this. As represented in the drawings, one end of the pivot shaft 14 is connected with the creel 12, and the other end with a gear wheel 20 of a reduction gear stage in a manner fixed against relative rotation. The gear wheel 20 meshes with a pinion 22, which is connected, fixed against relative rotation, with a stop plate 24 and is rotatably seated on an axle stub 26. In turn, the axle stub 26 is fastened on the winding head housing 10 of the textile machine. A flat spiral spring 28 is fastened with one of its ends on the stop plate 24, and its other end is connected with an adjustment gear wheel 30, which meshes with a motor pinion 32 of an electric step motor 34. The flat spiral spring 28 is fastened on the adjustment gear wheel 30 with the aid of three fastening bolts 36, 38, 40, for example. One end of the flat spiral spring 28 is clamped between the bolts 36, 38, 40 for this purpose, and is fixed in this portion by its inherent prestress. The other end of the flat spiral spring 28 is fastened on the stop plate 24 with two bolts 42 and 44. If the adjustment gear wheel 30 is rotated in respect to the stop plate 24, the flat spiral 28 is prestressed or relaxed, and because of this it generates a force acting on the stop plate 24, which is converted to a torque acting on the creel 12 via the pinion 22, the gear wheel 20 and the pivot shaft 14 A relative rotation between the adjustment gear wheel 30 and the plate 24 is limited by the bolt 40, so that two end positions of the stop plate 24 are defined. A first end position is defined by the striking of a first edge 46 of a first radially extending protrusion of the stop plate 24 against the bolt 40. A second end position is defined by the striking of a second edge 48 of a second protrusion of the stop plate, which starting at the axle stub 26, extends way in a direction opposite to the first protrusion, against the bolt 40. The force, which can be minimally or maximally generated by the flat spiral 28, and the minimal, or maximal, torque are fixed by these two end positions. For controlling the creel 12, and therefore the contact pressure of the bobbin 16 on the roller 18, the motor pinion 32 is displaced by the step motor 34 by a defined number of steps in a desired direction. This causes a rotation of the adjustment gear wheel 30, and therefore the prestressing or relaxation of the flat spiral spring 28. The force generated by the flat spiral spring 28 changes because of the prestressing or relaxation of the flat spiral spring 28 and is transmitted via the bolts 42, 44 to the stop plate 24 and the pinion 22 connected with the latter in a manner fixed against relative rotation. The force generated by the flat spiral spring 28 is converted into a torque by the pinion 22, which meshes with the larger gear wheel 20, which torque acts on the pivot shaft 14 and in this way decreases or increases the contact pressure of the bobbin 16 on the roller 18. Because the pinion 22 and the gear wheel 20 constitute a reduction gear stage, a relatively weak force of the flat spiral spring 28 suffices for generating a relatively large torque at the pivot shaft 14. Therefore the flat spiral spring 28 can be designed to be comparatively weal and cost- effective. In an alternative embodiment (not represented) it is provided that the torque generator is arranged in the area of a second reduction gear stage consisting of the motor pinion 32 and the adjustment gear wheel 30. It is possible in this way to generate a large torque at the pivot shaft 14 even with a weak and cost-effective step motor 34. However, the required prestress of the flat spiral spring 28 can only be achieved by tolerating a relatively large displacement track in this case. For providing a clearer representation, the creel arm 12, the bobbin 16 and the roller 18 are not represented in Fig. 2. As can be seen from the representation in Fig. 2, a torque generator is constituted in the embodiment represented by the adjustment gear wheel 30 with the bolts 36, 38 and 40, the flat spiral spring 28 the wing plate 24 with the bolts 42 and 44, as well as the pinion 22. Figs. 3 and 4 schematically shown as ribbon drive employed in a further embodiment of the invention. Here, a pivot shaft 51 is only indicated by a dash-dotted line in Fig. 4. A transfer lever 52 is connected, fixed against relative rotation, with the pivot shaft 51 and has a cylinder section 54 which is centered in respect to the pivot shaft 51. A ribbon 60 or 62 is respectively fastened at the attachment points 56 and 58 of the cylinder section 54. The ribbons 60 and 62, which are preferably made of steel, extend from the cylinder section 54 to a driveshaft 64, which is connected with a torque generator, wherein both ribbons 60 and 62 are spirally wound on the driveshaft 64. The attachment points 56 and 58 on the cylinder section 54 are located on opposite sides in relation to the driveshaft 64, on which the ribbon 60, or the ribbon 62, are fastened at the attachment point 66, or 68. This means that a rotation of the driveshaft 64 causes a winding and unwinding movement of the ribbons 60, 62 which is converted into a pivot movement of the transfer lever 52, and therefore of the creel. To the greatest extent the ribbon drive represented in Figs 3 and 4 without play and hysteresis. WE CLAIM 1. A device for controlling a creel (12) of a textile machine, which is seated, pivotable to a limited degree by means of a pivot shaft (14) and can be loaded with a torque generator (24, 28, 30) which, controlled by a drive mechanism (34), generates a defined torque, characterized in that the torque generator (24, 28, 30) is connected with the creel (12) by means of a reduction gear stage (20, 22, 60, 62). 2. The device as claimed in claim 1, wherein the torque generator has a flat spiral spring (28). 3. The device as claimed in claim 1 or 2, wherein the gear stage is embodied as a ribbon gear (60, 62). 4. The device as claimed in one of the preceding claims, wherein the torque generator is connected with a driveshaft of the drive element. 5. The device as claimed in one of claims 1 to 4, wherein a further gear stage (32, 31) is provided between the drive element (34) and the torque generator (24, 28, 30) 1. Device for Controlling a Creel of a Textile Machine 2.1 The invention relates to a device for controlling a creel (12) of a textile machine, which is seated, pivotable to a limited degree, by means of a pivot shaft (14) and is loaded with a torque generator (24, 28, 30) which, controlled by a drive mechanism (34), generates a defined torque. 2.2 In accordance with the invention, the torque generator (24, 28, 30) is connected with the creel (12) by means of a reduction gear stage (20, 22; 60, 62).

Documents:

00473-cal-2001-abstract.pdf

00473-cal-2001-claims.pdf

00473-cal-2001-correspondence others.pdf

00473-cal-2001-description complete.pdf

00473-cal-2001-drawings.pdf

00473-cal-2001-form 1.pdf

00473-cal-2001-form 18.pdf

00473-cal-2001-form 2.pdf

00473-cal-2001-form 26.pdf

00473-cal-2001-form 3.pdf

00473-cal-2001-form 5.pdf

00473-cal-2001-letter patent.pdf

00473-cal-2001-priority document.pdf

00473-cal-2001-reply f.e.r.pdf

473-CAL-2001-FORM-27.pdf

473-CAL-2001-OTHER PATENT DOCUMENT.pdf