Weft thread monitor with control circuit to eliminate false weft

Details Weft thread monitor with control circuit to eliminate false weft Weft thread monitor with control circuit to eliminate false weft

1989-12-22

1991-07-16

Falik, Andrew M.

Textiles: weaving

Stopping

Weft

1394351, 1394355, 139452, D03D 4730, D03D 5134

Patent

active

050316699

ABSTRACT:
A weft thread monitor for an air weaving loom with air jets for inserting weft thread yarns of different qualities such as coarse, fine, thick or thin yarns into the loom shed, has an amplifier or comparator controlled in response to control signals which represent the different yarn qualities for providing a loom control signal which is substantially independent of these yarn qualities. The different quality yarns are pulled off from thread storage spools. The air jets of the main nozzles and of relay nozzles are controlled by an air jet insertion control forming part of a central processing unit. The weft thread monitor with its monitoring or sensor element or elements is arranged at the exit side of the air channel formed by profiled reed teeth of the air jet loom. The output of the sensor element is connected to the input of the amplifier or comparator. A uniform output signal from the amplifier or comparator is assured for all types of weft threads regardless of the yarn specific quality, by controlling the amplifier gain or the comparator threshold, for compensation in response to these yarn qualities. Thus, a very thin smooth yarn or a very thick, corase yarn will yield the same resulting output signal.

REFERENCES:
patent: 4565224 (1986-01-01), Keller
patent: 4607668 (1986-08-01), Tholander

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