Clearer roller holding device for drafting arrangements in spinning groups

Abstract

A drafting arrangement for spinning groups with at least one upper roller carrier and weighting arm held by a machine frame in which clearer rollers are rotatably mounted on an axis and can shift in a guide of a bearing element transversely to their axis of rotation in such a manner on the upper roller carrier and weighting arm that they rest on the particular associated upper roller during the spinning process. At least one end of the axis of a clearer roller is designed with a holding device that extends behind the guide of the bearing element, which guide is designed as a connecting link guide.

Description

CROSS-REFERENCES TO RELATED APPLICATIONS [0001] This application claims the benefit of German patent application 10231102.1 filed Jul. 10, 2002, herein incorporated by reference. BACKGROUND OF THE INVENTION [0002] The invention is relative to a drafting arrangement for spinning units. [0003] The fibrous material to be spun is customarily supplied to the spinning groups in the form of slubbings that are drafted in front of the spinning group. Drafting arrangements are used for this purpose. Waste fibers can wind around the rollers or cylinders of the drafting arrangement in an undesired manner during the operation of spinning. If this fibrous material clinging to the roller separates again from the roller and passes into the stubbing path, that is also called the track, the slubbing can receive undesired knots or thickened areas. This can result in intolerable defects in the yarn. It is known that the waste fibers can be removed from the drafting arrangement rollers by clearer roller...

AI Technical Summary

Benefits of technology

[0011] A holder is present with the design in accordance with the invention that permits a simple and rapid assembly and disassembly. The number of structural parts to be manufactured and assembled is reduced. The holder in accordance with the invention has a simple design and can be universally used for clearer rollers mounted between two upper roller carrier and weighting arms overlapping two tracks as well as for clearer rollers for one track.

[0012] A holding device designed as a collar can be manufactured in a particularly simple and economical manner.

[0013] A connecting link guide comprising a spring element on each side of the bearing element, with which spring the axis of the clearer roller can be loaded with a force that presses the clearer roller against the upper roller, assures that the clearer roller always has contact with the upper roller and thus results in a better clearing action. At the same time the play between the connecting link guide in the axis of the clearer roller is eliminated and a stabilization of the direction of the clearer roller achieved.

[0014] An electrostatic charging of the clearer roller is avoided with an electrically conductive connection between clearer roller and machine frame. Such an electrostatic charge can result in functional disturbances and yarn defects.

Problems solved by technology

Waste fibers can wind around the rollers or cylinders of the drafting arrangement in an undesired manner during the operation of spinning.

If this fibrous material clinging to the roller separates again from the roller and passes into the stubbing path, that is also called the track, the slubbing can receive undesired knots or thickened areas.

This can result in intolerable defects in the yarn.

In the case of cleaner rollers mounted in this manner the upper rollers of the two outer tracks of a spinning machine cannot be loaded with a cleaner roller.

However, such a procedure has the significant disadvantage that production losses must be accepted.

Also, the device according to Swiss Patent Publication CH 402 690 is not suitable for cleaning the upper rollers of the outer track.

These embodiments are associated with disadvantages, depending on design.

The manipulating of such clearer rollers during assembly and disassembly is relatively complex compared with a simple insertion of the clearer rollers, as is possible in the design of Swiss Patent Publication CH 402 690.

The construction of the holder is relatively complex.

The use of clearer rollers that are inserted between two upper roller carrier and weighting arms and overlap two tracks is not possible in the device according to German Patent Publication DE 195 21 265 A1.

This is a disadvantage in as far as significantly less expense for assembly and disassembly is required in the cleaning of the clearer roller on the plurality of drafting arrangements of a spinning machine with rollers overlapping two tracks.

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