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US 5,332,007 AGranted
Faulty weft control on air nozzle looms
AssigneeLindauer Dornier GmbH
InventorAdnan Wahhoud
Life of this patent
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AssigneeLindauer Dornier GmbH
InventorAdnan Wahhoud
Estimating the term…
The inclusion of faulty weft threads into a fabric being woven on an air nozzle loom is prevented with a minimal effort and expense for equipment and control components. For this purpose a sensor upstream of the weft thread insertion components provides the signal of a fault and this signal starts a thread removal program under the control of the loom control unit. The program is stored in the memory of the central computer of the control unit. According to the program the beat up motion is stopped and a predetermined length of weft thread is passed entirely through the insertion channel. When a predetermined number of weft shots have been made or a predetermined length of time has passed, the program provides a signal for the cut off of the faulty section of the weft thread and the faulty section is sucked out of the insertion channel and collected in a container. When the end of the cut off faulty section of weft thread passes an exit monitor, a respective signal is provided to terminate the discarding program and resume normal operation.
A method for removing a faulty weft thread length from a weft thread in an air nozzle loom and preventing a beat-up of the faulty weft thread length in a fabric being woven on said air nozzle loom, comprising the following steps:
An air nozzle loom in combination with an apparatus for removing a faulty weft thread length from a weft thread in said air nozzle loom and for preventing a beat-up of the faulty weft thread length in a fabric being woven on said air nozzle loom, said combination comprising a reed (13) with a weft insertion channel (13A) having a weft entrance and a weft exit, a weft thread supply device (6) for supplying weft thread into said loom, a prewinding device (7) positioned downstream of said weft thread supply device (6) as viewed in a direction of weft thread advance, at least one main nozzle (8, 8A) positioned downstream of said prewinding device (7) for inserting said weft thread into said weft insertion channel (13A), a weft cutter (20) between said main nozzle (8, 8A) and said weft entrance, a weft monitor (22) at said weft exit for producing a restart signal, a suction device (18) at said weft exit for collecting said faulty weft thread length, a weft thread quality sensor (9) positioned downstream of said weft thread supply device for producing a weft fault signal, a central control unit including a memory (11A) having a fault removal program stored in said memory, electrical conductors connecting said quality sensor (9) and said weft monitor (22) to said central control unit, and electrical control conductors connecting said central control unit to said prewinding device (7), to said main nozzle (8), and to said weft cutter (20) for operating said loom and for performing said fault removal program for removing said faulty weft thread length without beat-up and without cutting until a predetermined weft length has been removed by said suction device.
Dependencies are inferred from the claim text.