Patent GB-124951-A (GB)
Title: Improvements in and connected with the Thread Parting Mechanism of Weft-replenishing Looms.
Inventor: WADE HAROLD
IPC: D03D45/50
Filed: 1918-05-22
Abstract: 124,951. Wade, H., (Hopedale Manufacturing Co.). May 22, 1918. Weft, cutting.-Weft-cutting mechanism for use in connexion with weftreplenishing mechanism comprises blades mounted on a stationary part of the loom and connected with the weftreplenishing mechanism so that they are moved out of their normal raised position into a lowered operative position to cooperate with the reed dents in severing the incoming weft on the beat-up following weft-replenishment; in feeler-controlled looms, the cutting-mechanism also severs the outgoing weft on the weftreplenishing beat-up, and mechanism is provided to stop the loom if either the outgoing or the incoming weft is absent when the blades are moved into operative position. As shown, blades 28 extend between the dents 24 of the reed and each has a rearwardly directed knife-edge 32. The blades are secured to a head 29 on the inner end of a rod 30 with a cranked middle part 31 normally held down by a cam 39 on a controller 40 pivoted in a pin 42, which passes through a slot 41 therein. When a shaft 13 is rocked and an arm 14 thereon is swung forwards on initiation of weft-replenishment, a shoulder 54 on a latch lever 55 pivoted at 56 on an adjustable bracket on the upper end of the arm 14 is moved from under the front end of a release lever 53, also pivoted on the pin 42, so that the front end of the lever falls and acts through a slot 51 therein on a pin 50 on the controller. The hooked front end 46 of the controller descends into position to be engaged by a bunter 47 on the lay, and the controller is moved forwards, releasing the cranked part 31 of the rod 30, and a spring-pressed slide 61 raises the part 31 and depresses the front ends of the blades 28 into position to engage and sever the weft as the lay moves it forwards. As the controller moves forwards, the pin 50 raises the release lever 53, but, as the shoulder 54 is not returned to the normal position until the return movement of the arm 14 takes place after weft-replenishment, the release lever is not held up by the shoulder until after two cutting operations for the outgoing and incoming wefts respectively. A spring returns the controller to its rearward position and raises the blades 28. Forward movement of the controller frees a cross-bar 70, on arms 69 secured to collars on a pivot pin 72, from a slot 84 in a cam-piece 85 secured to the controller, so that the cross-bar 70 is moved down by the upper edge of the slot into position to be engaged by a barb 82 on an actuator 81 connected to the lay. The pivot pin 72 is mounted in the upper end of a lever 74 pivoted at 75 and connected by a rod 76 and an arm 77 to a stop-shaft 78 connected to means for stopping the loom. When weft is present to be severed by the blades 28, the forward pull on the blades moves the inner end of the rod 30 forwards in a slot in the boss 37 supporting this end, and, through an arm 90 and check-nuts 91 on a rod 80 connected to the rod 30, a rocking movement is given to the pin 72, and the cross-bar 70 is momentarily raised so that it is not engaged by the barb 82. If weft is not present, the cross-bar is engaged by the barb, the lever 74 is rocked, and the loom is stopped. The supports for the rod 30 are adjustable so that the blades 28 may be adjusted to co-operate with any of the dents of the reed according to the width of the fabric to be woven. In detector-controlled looms, the stopping-mechanism is disconnected and only the incoming weft is severed.