Method and device for feeding weft yarn
A weft yarn and blowing device technology, which is applied in textiles, papermaking, looms, textiles, etc., can solve the problems of high weft yarn tension, weft yarn arriving too late, weft yarn breakage, etc., and achieve the effect of avoiding weft yarn entanglement and increasing weaving speed
Inactive Publication Date: 2015-10-14
PICANOL NV
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Problems solved by technology
Such a method has the disadvantage that if a certain weft thread is supplied too slowly to the storage element, this weft thread will be introduced too slowly into the weaving shed, so that the weft thread arrives too late in the weaving cycle at the opposite side of the weaving shed and may Weft defects appear
Such a method also has the disadvantage that if a certain weft thread is supplied to the storage element too quickly, this weft thread will be introduced too quickly into the weaving shed, so that the weft thread arrives at the opposite side of the weaving shed too early in the weaving cycle, and Subjecting the arriving weft yarns to high tensions so that weft yarn breakage can occur
Method used
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[0038] figure 1 The loom shown comprises four devices 1 for feeding weft threads 2 . Such a device 1 is known from WO 2010 / 006774 A2, the description of which forms part of the present patent application. Each device 1 comprises a weft feeder 3 onto which a weft thread 2 from a bobbin 4 is wound. Each device 1 also comprises a main blower 5 positioned next to the weaving shed 6 and arranged to blow the weft thread 2 into the weaving shed 6 . The weaving shed 6 is formed by warp threads 7 and 8 . Each device 1 also comprises a yarn brake 9, a blowing device 10 and a weft storage element 11, which are arranged to guide the weft thread 2 successively from the weft feeder 3 via the yarn brake 9, the blowing device 10 and the weft storage element 11 to main injector 5. A plurality of auxiliary nozzles 12 are shown, which can enter into the weaving shed 6 and are arranged to support the weft thread 2 introduced into the weaving shed 6 . In a preferred embodiment, the main blowe...
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Method and device for feeding weft thread (2) in a weaving machine, wherein a reference moment in the weaving cycle is determined that is a measure of the stretching moment in which during the insertion of weft thread (2) into the weaving shed (6) the weft thread (2) stored in the storage element (11) changes from stored condition into stretched condition and wherein a thread holder (20) arranged between a prewinder (3) and a storage element (11) is controlled by a control unit (31) as a function of the determined reference moment in the weaving cycle.
Description
technical field [0001] The invention relates to a method for feeding weft threads in a weaving machine. The invention also relates to a device for supplying a weft thread in a weaving machine designed to employ the method according to the invention. Background technique [0002] Devices for feeding weft threads to the weaving shed of an air-jet loom are known from US 4,947,898 or WO 2010 / 006774 A2. The device comprises a storage element for storing weft threads, the storage element comprising a cavity delimited by side walls, the cavity having an inlet and an outlet for the weft threads. Openings are provided in the side walls to allow compressed air to escape. The device comprises a clamping element for clamping the weft thread, which clamping element is arranged near the outlet of the cavity. The clamping elements can be closed for storing weft threads and can be opened for removing weft threads. The clamping element can also close the outlet of the chamber for compres...
Claims
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IPC IPC(8): D03D47/36
CPCD03D47/36D03D47/362D03D47/368
Inventor P.普伊桑特
Owner PICANOL NV