Textiles: weaving – Warp manipulation – Traversing
Patent
1998-06-04
1999-12-07
Falik, Andy
Textiles: weaving
Warp manipulation
Traversing
D03C 708
Patent
active
059966467
DESCRIPTION:
BRIEF SUMMARY
DE 128 364 discloses a device for decorating material by means of cord twisters. Hereby, up to four threads are twisted around a core. The twisting occurs outside of the shed, so that the weft thread cannot be tied off. Finally, this device is not a device for producing a leno selvedge.
The US-A 36 13 741 discloses a leno selvedge device showing a driven rotating element, which is provided at its ends with tubes arranged crosswise for guiding the leno threads. The rotating element has at its ends a turntable connected with the rotating element for receiving spools for the leno threads. This entails that the spools are always rotating together with the rotating element, meaning that a high mass has to be sped up and braked down again.
A device as mentioned above is known out of DE-PS 44 05 776. Hereby, an electrically drivable servomotor is provided which drives a doup disc, the doup disc forming the rotor of the electrically drivable servomotor. The stator itself is mountable onto the loom by means of a carrying element, preferrably in a free space between the longitudinal braces and the healds in front of the first heald frames of the loom. More particularly the doup disc, which forms the rotor of the electrically drivable servomotor, has two opposite openings through which one leno thread at a time is led, these openings serving as guide elements. This known rotator for producing a leno selvedge in a loom works so that it completes several hundred revolutions in one direction and ties off one weft thread after each revolution. A full leno selvedge is thus achieved. On the feeding side of the two leno threads, the leno threads are twisted according to the number of revolutions of the doup disc so that, in order to undo this twisting, an inversion of the douping direction is indicated, the doup disc having to rotate in exactly the opposite direction. The number of revolutions in either direction has hereby to be the same in an average period of time. If the douping direction were not inverted, the leno threads would, some time or other, tear due to the increasing tension occasioned by the growing twisting.
In case of the known fast-running looms making up to 1200 werfts per minute, it was ascertained that after approximately 100 to 1000 revolutions in one direction an inversion of the douping direction should occur. That means that, according to the state of the art, the rotor and thus the douping disc of the electrically drivable servomotor has to be reversed every 10 to 100 second. Due to the number of strokes of a loom, the time available for inversion is of 100 milliseconds (msec) maximum. That means that the rotor of the motor has to stand still and to rotate in the reversed douping direction at full speed within 100 msec. Due to the high mass of the douping disc and of the rotor respectively, this performance can be achieved with known motors only at high cost. The idea to reduce the moved mass of the motor by choosing a rightaway smaller motor will naturally arise. The danger incurred in this case is that, if the rotor and thus the douping disc are given a smaller diameter, the shedding occurring between the two leno threads guided through the douping disc is not sufficient, so that the weft thread cannot be inserted accurately. Moreover, the threads can still stick together, impeding the formation of a clean selvedge.
SUMMARY OF THE INVENTION
The object of the invention is therefore to provide a device of the abovementioned type, which makes it possible to manufacture a correct full leno selvedge even in fast running looms.
The solution of the object is to design the guide elements as arms provided at their ends with eyes through which the leno threads are passed. The arms themselves are easy to form, since they are hardly ever subjected to stress. They thus represent a relatively neglectable mass. Due to the arrangement of the arms on the rotor of an electromotor, the dimensions of the rotor is independent of the desired aperture angle of the shed. That means that a small motor with an accordin
REFERENCES:
patent: 3613741 (1971-10-01), Ravella
patent: 4166480 (1979-09-01), Muller
patent: 4421141 (1983-12-01), Brouwer
patent: 5518039 (1996-05-01), Haeussler et al.
Patent Abstracts of Japan, vol. 13, No. 451 (C-643), Oct. 11, 1989 (Translated Abstract) 174633 A.
JP 01 174633A (Nissan Motor Co. Ltd), Jul. 11, 1989.
Hockemeyer Kurt
Klocker Matthias
Schwemmlein Christoph
Falik Andy
Klocker Entwicklungs GmbH
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