DE2433769A1 - Open end spinning cup carding drum - with helically preformed saw tooth carding element for push fit onto drum surface - Google Patents

Abstract

Carding drum whose periphery is provided with a helically disposed set of carding teeth has the latter provided in the shape of a preformed helically wound toothed wire and the inner dia of the helix is smaller than the outer dia. of the drum. Carding fibres supplied to an open-end spinning cup. Set of carding teeth can be readily adjusted and replaced when worn.

Description

Licker-in roller for open-end spinning machines The invention relates to a lickerin roller for open-end spinning machines, with a roller body with a circular cylindrical Jacket surface and with a sawtooth wire resting helically on the jacket surface.

Lickerin rollers are already known in which the lateral surface of the roller body is provided with a helical groove into which a sawtooth wire is pressed in as a set. Such a lickerin is relatively expensive in production. In addition, there is an unavoidable gap formation between Groove and sawtooth wire, usually minimized makeshiftly by a rolling process will. This gap formation has a disadvantageous effect in the open-end spinning process, since Fibers can get caught in the crevices.

The sets of lickerin rollers for the open-end spinning process are subject to rapid wear. The service life of a set is often the same when processing synthetic fibers only about one to two weeks. It is therefore It is of great importance that the lickerin can easily be reupholstered.

The invention is based on the object of a lickerin roller To create the type mentioned at the beginning, which can be produced easily and with little Can garnish effort again.

The solution to this problem is to be seen in the fact that the sawtooth wire Is preformed helically with a diameter approximately corresponding to the diameter the outer surface of the roller body. This makes it a much harder one Wire can be used as with conventional Vorreierwalzen, in which the sawtooth wire is wound onto the outer surface, where it is curved. Another advantage consists in »that the helically wound sawtooth wire is available as a spare part and can be plugged onto the lickerin on the spot.

Preferably, at least that end is at the front in the direction of rotation of the sawtooth wire attached to the roller body.

This ensures that the sawtooth wire is not loosened during operation is, but presses with an increased force on the outer surface of the roller body.

A further development is that the rear in the direction of rotation The end of the sawtooth wire engages in a groove-like recess in the lateral surface. This prevents the sawtooth wire from slipping sideways.

According to another development, this is the rear in the direction of rotation End held by a clamping device. This allows increased tension generate in the sawtooth wire, which is an unconditionally firm support of the same on the Guaranteed outer surface of the roller body.

A simple and safe way of fixing is to that the end or ends of the sawtooth wire in groove-like depressions in the lateral surface and are clamped in place by screws acting on the side.

The invention is described below with reference to schematic drawings several exemplary embodiments described in addition.

Figure 1 is an axial section through a lickerin according to the invention.

FIG. 2 is a cross section along the line II-II of FIG.

FIG. 3 shows a perspective view of the shape of a wire spiral.

The lickerin roller shown in Figure 1 comprises a roller body 1, which has a circular cylindrical outer surface 2, which at their front ends through Beltline 3 is limited. One beltline can be designed as a flange disk 4 which is screwed to the roller body 1.

A sawtooth wire lies on the jacket surface 2 in spiral windings 5, the beginning and the end of the same in each case in a groove 6 of the lateral surface 2 engages and by means of an axially parallel through the roller body into the Groove extending screw 10 is clamped.

In the force-free state, the sawtooth wire has that shown in FIG Shape, so it is already curved in a spiral »with a smaller diameter than that of the outer surface 2 of the lickerin. For applying the sawtooth wire the board plate 4 is unscrewed and the sawtooth wire 5 with his one end 7 is applied first to the lateral surface 2 by means of a rotary movement. The diameter of the wire spiral 9 is slightly increased by the rotary movement, so that the wire spiral, despite its smaller diameter in the force-free state than the diameter of the lateral surface 2 of the roller body 1 easily separated on this leaves. As soon as the beginning of the wire 7 and the end of the wire 8 in the corresponding groove 6 of the Engage roller body 1, the individual turns of the sawtooth wire are optionally brought at an even distance from each other and tightened the screws 10 and then the board plate 4 is screwed tight again.

The lickerin is then ready for operation.

A groove 6 or other fastening device should at least be fastened to the roller body 1 with the end lying at the front in the direction of rotation.

Due to the forces acting on the sawtooth wire during operation, the Sawtooth wire with a thickness that depends on these forces on the outer surface 2 so that the sawtooth wire never loosens. The bigger the on the same acting frictional forces are, the more firmly it is pressed onto the outer surface.

Such a lickerin can easily be garnished without that special expertise is required. Since the sawtooth wire is already in the almost finished shape is bent, there are no large bending stresses same on.

Claims (5)

Claims Licker-in roller for open-end spinning machines, with one roller body with a square-cylindrical surface and with a helical one on the surface overlying sawtooth wire, d u r c h e -k e n n n z e i c h n e t that the Sawtooth wire (5) is preformed in a helical shape with a diameter approximately corresponding the diameter of the lateral surface (2) of the roller body (1). 2. Licker-in roller according to claim 1, d a d u r c h g e -k e n n z ei c h n e t that at least the end of the sawtooth wire which is at the front in the direction of rotation (5) is attached to the roller body (1). 3. Lickerin according to claim 2, d a d u r c h g e -k e n n z e i c h n e t that the end of the sawtooth wire lying behind in the direction of rotation in engages a groove-like recess in the lateral surface (2). 4. Lickerin according to claim 2 or 3, d ad u r c h g e k e n n z e i c h n e t that the rear end of the sawtooth wire in the direction of rotation of a Clamping device is held. 5. Lickerin according to claim 1 or 2, d a d u r c h -g e k e n n z e i c h n e t that the end or ends of the sawtooth wire in groove-like depressions the lateral surface and are clamped by screws acting on the side Blank page