Loom method and apparatus for avoiding beat up markings in a fab

Details Loom method and apparatus for avoiding beat up markings in a fab Loom method and apparatus for avoiding beat up markings in a fab

1993-09-17

1995-04-11

Falik, Andrew M.

Textiles: weaving

Weft manipulation

Means for withdrawing defective weft

139 1E, D03D 4730

Patent

active

054049164

ABSTRACT:
When a faulty weft thread must be removed after it has been bound into the fabric and beat-up, it is necessary to perform a so-called reverse weaving operation following the stopping of the normal weaving operation in response to a stop signal signifying that a faulty weft thread has been detected. For this purpose the loom main shaft and the heald drive shaft are rotated for a number of rotational degrees in the same direction in which these shafts are rotated just prior to the stopping of a weaving operation in response to the above mentioned signal. Next, the drive between the main shaft and the heald shaft is interrupted. Next, the main shaft and thus also the reed shaft and with it the reed, are rotated back within a predetermined angular range between two successive reed beat-up motions. During this time the heald shaft is rotated back, preferably to the so-called detection point with a higher r.p.m., or rather with a higher angular speed than the main shaft. This function is accomplished by an auxiliary step-up transmission gear between the main shaft and the heald shaft. The auxiliary gear is bypassed during normal operation when there is no weft fault and it is connected in series during the operation for removing of a faulty weft thread.

REFERENCES:
patent: 4989644 (1991-02-01), Tanaka et al.
patent: 5224520 (1993-07-01), Shinbara et al.
patent: 5228480 (1993-07-01), Tamura

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