Title of Invention

FIXED COMB

Abstract

A fixed comb for a textile treatment or processing machine. spectficafty a combing machine, comprising a piurality of adjacent needies disposed in at least one now, wtiicti have, at least in sections, a working angle not equal to 90° relative to the theoretical movement plane of the sliver being combed, wherein, viewed in the direction of the movement, a nipper unit Is disposed before the fixed comb and a pair of take-off rollers Is disposed after the fixed comb, characterized in that the needles (8) of the fixed comb (7) have a working angle (a) > 92°. particularly >950, in the region of the free needle projection (11).

Full Text

The present invention relates to a fixed comb for a textile treatment or processing machine, specifically a combing machine, comprising a plurality of adjacent needles disposed in at least one row, which have, at least in sections, a working angle not equal to 90° relative to the theoretical movement plane of the sliver being combed, wherein, viewed in the direction of the movement, a nipper unit is disposed before the fixed comb and a pair of take-off rollers is disposed after the fixed comb. A fixed comb of the above type, or a combing machine with a fixed comb of the above type, is known, for example, from CH 679 590 A5. The known fixed comb has a free needle projection wherein the needles in that region are angled such that the angled region at the free end of the needle extends in the direction of the movement, viewed relative to the sliver. Solutions of this type are known also in various other embodiments, for example from EP 0 557 698 Al. Conventionally, the angling or curving of the needles is intended to achieve that the sliver becomes caught in the needles and is guided to their center region. With this as the starting point, the invention has as its object to improve a fixed comb of the above type in such a way that an improvement of the combing result is attained at least in conjunction with certain types of textile treatment and processing machines. This object is met according to the invention in such a way that the needles of the fixed comb in the region of the free needle projection have a working angle > 92°, particularly > 95°. An optimal angle, for example, is 98°. -2- Surprisingly it has been found that the result of such a design of the free needle projection is that the needle trim is always free, and the fibrous web is thus able to easily penetrate into the comb, and boll fragments, burl and noils accordingly are held back. Boll fragments, burls and noils that initially become stuck due to an unfavorable shape or size are pushed down into the comb-out position of the circular comb by the upper nipper element, off the fibers that remain in the comb and protrude out of the comb itself, after the combed staple has been taken off By this process, which is aided by the inventive needle position, the fixed comb cleans itself during the combing process. In the subsequent combing cycle, the sliver end that was previously combed out by the circular comb can thus easily penetrate into the clean fixed comb. This results in less stress on the entire fixed comb as well as on its fastening components. Due to the lesser stress, which remains virtually constant during the entire operating time of the machine, the combing machine can be precisely adjusted, which results in an optimization of the combing process, i.e., specifically the percentage of long fibers in the combing waste is reduced and the combing process can be adapted to the desires of the individual customer. The inventive design can also be applied very advantageously in combination with a fixed comb that is known/7er se, which is additionally cleaned pneumatically. In a further embodiment of the invention, provision may be made for the needles to be curved convexly against the direction of movement of the sliver. Specifically, the curvature of the needles and optionally that of the cover plates may be largely coaxial to the upper take-off roller. This results in the free needle projection extending very closely to the region between the two take-off rollers, which provides for an improvement in the combing result. -3- The invention will be explained in detail below, based on a preferred embodiment in conjunction with the drawing, in which: Fig. 1 shows a side view of the combing region of the fixed comb with an opened nipper unit; Fig. 2 shows an illustration according to Fig. 1 with a closed nipper unit; Fig. 3 shows an enlarged illustration of the combing region to illustrate the geometric relationship; and Fig. 4 shows an illustration corresponding to Fig. 3 of a modified embodiment. A combing machine of the type shown in the drawing comprises a nipper unit composed of a lower nipper element 1 and an upper nipper element 2, wherein the upper nipper element 2 is movably supported on the lower nipper element 1 for gripping the sliver 3 during a combing movement along a circular arc section 4. The removal and further conveyance of the sliver after completion of the combing movement takes place by means of the two take-off rollers 5 (upper take-off roller) and 6 (lower take-off roller). The fixed comb 7 comprises a row of adjacent needles 8, which may be, e.g., stamped elements and are held on cover plates 9. -4- Below the lower edge 10 of the cover plates 9 the free needle projection 11 extends into the sliver 3 in order to comb the same during a relative movement between the needles 8 and the sliver 3. While the respective upper and lower nipper element 2 or 1 is shown in an open position in Fig. 1, Fig. 2 shows the closed position in which the sliver 3 is held between the nippers, and the freely projecting region of the sliver 3 is combed by means of the circular comb 12, which is shown only schematically. The needles 8 and the cover plates 9 of the fixed comb 7 have a curvature that extends approximately coaxial to the center point 13 of the upper takeoff roller 5 so that the free needle projection 11, as apparent in Fig. 1, extends particularly close to the contact region between the take-off rollers 5, 6, which has proven very advantageous for the combing result. In Fig. 3 the relationships in the area of operation of the free needle projection 11 of the fixed comb 7 are shown again in more detail. From this it is apparent that the working angle a between the front edge 14 of the needles 8 viewed in the direction of the movement (arrow B) of the sliver 3 and the theoretical center plane of the sliver 3 is 98°, i.e., in accordance with the invention it is considerably greater than 90°. The needle projection 11 is angled in the region of its free front end by an angle p of 15° so that for the tangent 15 starting from the tip 16 of the needles 8 to the lower take-off roller 6, an angle y of 60° results relative to the extension 17 of the rear edge of the angled region of the needles 8, or an angle of altogether 75° to the rear edge 14 of the needle 8. The angle 5 of -5- the tangent 18 through the crown 19 of the angled bend to the lower takeoff roller 6 is 88°. The above-described geometric relationships result in particularly favorable combing results. In Fig. 4 a similar illustration has been implemented as in Fig. 3, however, the projection 11 of the needles 8 does not have an angled bend. The angle a is also 98°. The angle y of the tangent line 15 through the tip 16 to the lower take-off roller 6 is 79°. -6-WE CLAIM 1. A fixed comb for a textile treatment or processing machine, specificaiiy a combing machine, comprising a plurality of adjacent needles disposed in at least one now. which have, at least in sections, a worlcing angle not equal to 900 relative to the theoretical movement plane of the sliver being combed, wherein, viewed in the direction of the movement, a nipper unit is disposed before the fixed comb and a pair of take-off rollers is disposed after the fixed comb, characterized in that the needles (8) of the fixed comb (7) have a working angle (a) > 920, particularly >950, in the region of the free needle projection (11). 2. A fixed comb as claimed In claim 1 wherein the needles (8) are curved convexty against the direction of movement (arrow B) of the sliver. 3. A fixed comb as claimed in claim 2, wherein the curvature of the needles (8) extends approximately coaxial to the axis of rotation (13) of the upper take-off roller (5). 4. A fixed comb as claimed in claim 1, wherein the working angle a of the free needle projection (11). measured between the center movement plane (3) viewed in the direction of the movement (arrow B) before the fixed comb (7) and the extension of the frovA needle edge (14), is approximately 98°. 5. A fixed comb as claimed in claim 1. wherein the angle between the front edge (14) of the free projection (11) of the needles (8) and the tangential line (15) through the needle tip (16) to the lower take-off roller (6) is 65° to 85°. particularly 75" to 80°. 6. A fixed comb as claimed in claim 1, wherein provision Is made for a pneumatic cleaning. A fixed comb for a textile treatment or processing machine. spectficafty a combing machine, comprising a piurality of adjacent needies disposed in at least one now, wtiicti have, at least in sections, a working angle not equal to 90° relative to the theoretical movement plane of the sliver being combed, wherein, viewed in the direction of the movement, a nipper unit Is disposed before the fixed comb and a pair of take-off rollers Is disposed after the fixed comb, characterized in that the needles (8) of the fixed comb (7) have a working angle (a) > 92°. particularly >950, in the region of the free needle projection (11).

Documents:

in-pct-2002-00456-kol abstract.pdf

in-pct-2002-00456-kol claims.pdf

in-pct-2002-00456-kol correspondence.pdf

in-pct-2002-00456-kol description(complete).pdf

in-pct-2002-00456-kol drawings.pdf

in-pct-2002-00456-kol form-1.pdf

in-pct-2002-00456-kol form-18.pdf

in-pct-2002-00456-kol form-2.pdf

in-pct-2002-00456-kol form-3.pdf

in-pct-2002-00456-kol form-5.pdf

in-pct-2002-00456-kol letters patent.pdf

in-pct-2002-00456-kol priority document others.pdf

in-pct-2002-00456-kol priority document.pdf

in-pct-2002-00456-kol reply f.e.r.pdf