Spinners

Details Spinners Spinners

1984-08-01

1987-03-03

Rimrodt, Louis K.

Textiles: fiber preparation

Working

Drafting

19239, 19293, 73862, 57100, D01H 574

Patent

active

046463917

DESCRIPTION:

BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS

This application is a National Phase application corresponding to PCT/DE No. 84/00095 filed Apr. 26, 1984 and based upon German application P No. 33 15 247.0 filed Apr. 27, 1983 under the International Convention.


FIELD OF THE INVENTION

Spinners of this type have a drawing roller arrangement either on both long sides of the machine or only on one of the sides. The latter particularly applies to flyers and similar speeders. On the other hand, in the case of ring spinners, it is quite common to provide drawing roller arrangements at both long sides of the machine. The bottom rollers of a drawing roller arrangement can be driven by a common electric motor or by several electric motors, or, if there are two drawing roller arrangements, all the bottom rollers of these arrangements can be driven by the same electric motor. However, it also possible to drive two or several bottom rollers individually by separate electric motors.
In modern spinning mills, this type of spinner runs frequently without operator supervision as, due to the extensive automation, it hardly requires manual operation. For instance, in most cases the full spools or bobbins are replaced automatically by empty ones. Even thread breakages are often automatically eliminated by the thread fixing carriage which runs alongside the machine. However, through this extensive automation the machine may subjected to malfunction caused by fiber laps (also known as sliver laps, or laps for short) that may form in the bottom or top roller of the drawing roller arrangement as a consequence of thread breakages. If such a lap is not eliminated in time by hand, it will gradually increase in size and ultimately increasingly block sections of the drawing roller arrangement. This can damage the relevant drawing roller arrangement.
As far as long spinners are concerned, it is also known that at least the long bottom rollers, which limit the main drafting zones of the spinners' drawing roller arrangement or arrangements, are not interlocked at only one location by means of a toothed gearing, but at several locations which are arranged at great distances from one another, particularly at both longitudinal ends of the bottom roller. During a change in the draft caused by exchanging the gears of the toothed gearing, it may in some cases occur that, due to carelessness on the part of the operators, varying gears are inserted which, in turn, leads to varying gear ratios. After the machine has been started, the relevant roller arrangement is then considerably twisted to a varying degree, which may cause damage to the toothed gearing and the relevant bottom rollers.
It is, therefore, the task of this invention to eliminate malfunctions by a simple method, which may be caused by the errors described hereinabove.


SUMMARY OF THE INVENTION

With a spinner, this problem is solved by the distinguishing features of at least one drawing roller arrangement with a plurality of bottom rollers which are driven by at least one electric motor, characterized by the fact that the electric motor (22), or at least one of the electric motors, is provided with a monitor (23; 23'; 23") for monitoring its power input and/or torque, which has a sensor (29; 29') responding to at least one predetermined high threshold value, i.e., an upper power input and/or torque limit value and/or an anamalous rapid power input and/or torque increase in time of the electric motor, which, as a consequence of an excess in the corresponding threshold value, releases the alarm device (34; 34') and/or switches off the electric motor (22) or the spinner.
As the described lap formation at the top or bottom rollers gradually slows down the bottom rollers and possibly the top rollers, due to the winding of sliver at the lap location, simply because such a lap pushes in between adjacent bottom and top rollers and thus increasingly slows down their rotation, each such lap causes, after some time, a considerable increase in torque, which is required for driving the relevant bo

REFERENCES:
patent: 4195389 (1980-04-01), Schulz et al.
patent: 4314388 (1982-02-01), Hartmannsgruber et al.
patent: 4336684 (1982-06-01), Hartmannsgruber et al.
patent: 4473924 (1984-10-01), Hartmannsgruber et al.
patent: 4561152 (1985-12-01), Niimi et al.
German Publication No. 2,650,287 published 5-1978.

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