Textiles: weaving – Special-type looms – Pushed shed pocket
Patent
1997-11-25
1999-09-14
Falik, Andy
Textiles: weaving
Special-type looms
Pushed shed pocket
1391162, D03D 5108, D03D 4700
Patent
active
059506849
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a method as well as to an apparatus for removing a weft thread in a series shed weaving machine.
A series shed weaving machine has a roller-shaped weaving rotor which is partially encircled by warp threads. Shed forming elements are arranged on the surface of the weaving rotor which hold the warp threads in a high shed position or a low shed position respectively so that a shed moving in the direction of motion of the weaving rotor arises through which weft threads can be inserted by means of a fluid such as air. A weaving rotor has a plurality of simultaneously opened sheds so that a plurality of weft threads can be inserted into the weaving rotor simultaneously.
A disadvantage of the known series shed weaving machine is to be seen in the fact that a weft thread inserted into the weaving rotor can no longer be removed, in particular when the weft thread has already been cut at the weft insertion side. A removal of this type is required for example if the weft thread was not completely inserted into the shed due to a weft thread break or to a wad formation in the region of the weft thread tip. Furthermore, a warp thread break can arise, for example, for the elimination of which it may be necessary to remove a completely inserted weft thread.
SUMMARY OF THE INVENTION
The object of the invention is thus to provide a method as well as an apparatus for removing a weft thread in a series shed weaving machine.
The advantages of the invention are to be seen in the fact that, on the occurrence of an incorrectly inserted weft thread and/or a warp thread break, which are detected by a sensor, the weaving rotor is stopped before the inserted weft thread is beat up against the cloth edge so that the weft thread can be grasped and removed with high reliability by a weft thread removal apparatus. The invention has the further advantage that the cloth edge is treated very carefully during the removal of the weft thread so that no start-up places result on resuming the weaving process.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1a is an elevational view schematically illustrating a removing means executed in hook shape;
FIGS. 1b, 1c, 1f are elevational views schematically illustrating a removing means executed in comb shape;
FIG. 1d is an elevational view schematically illustrating a removing means executed in winder shape, i.e. in the shape of a hook winder;
FIG. 1e is an elevational view schematically illustrating a cutter device fastened to the removal means;
FIGS. 2a-2d are elevational views schematically illustrating various positions of the weaving rotor as well as of the weft thread removal device during the removal of weft threads;
FIG. 3 is a perspective view of a series shed weaving machine;
FIG. 4 is a further perspective view of the part of a further series shed weaving machine at the weft insertion side;
FIG. 5 is a section through a cloth with auxiliary edges.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 3 is a perspective view of components of a series shed weaving machine, in particular a weaving rotor 1 with a weft thread distributor apparatus 22, a weft thread removal device 13 as well as a holder device 21a on the weft thread insertion side 1a and a holder device 21b on the weft thread arrival side 1b. The roll-like weaving rotor 1 has shed holder members 4 on its surface which are arranged adjacent to one another, extend in a straight line over the entire breadth B of the weaving rotor 1 and thereby place the warp threads 8a, 8b, which partially encircle the weaving rotor 1, into a high shed or a low shed position respectively. In this way a shed 16 arises between the warp threads 8a, 8b through which a weft thread 10a, 10b, 10c, 10d, 10e can be inserted. At the surface of the roller shaped weaving rotor 1 shed holder, members 4 are arranged to be distributed over the entire periphery in such a manner that a plurality of sheds 16 moving in parallel through each of which a weft thread 10a, 10b, 10c, 10d, 10e can be inserted are simultaneously o
REFERENCES:
patent: 4502512 (1985-03-01), Suzuki et al.
patent: 4962793 (1990-10-01), Dussart et al.
patent: 5349990 (1994-09-01), Gacsay
patent: 5469896 (1995-11-01), Christe et al.
patent: 5564473 (1996-10-01), Schaich et al.
Degen Werner
Schaich Urs
Falik Andy
Sulzer Rueti AG
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