Patent GB-706908-A (GB)
Title: Improvements in or relating to control mechanisms
Inventor: SHORTLAND ARTHUR
IPC: D03C3/24
Filed: 1950-05-08
Abstract: 706,908. Loom jacquards. MELLOR, BROMLEY & CO., Ltd. April 23, 1951 [May 8, 1950], No. 11396/50. Class 142(2)[Also in Group VIII] In the selective control of individually operable elements by a two-ended strip having formed therein holes or impressions and/or embossings and passed over a driving roller or cylinder provided with peripheral pins or teeth engaging in regularly spaced holes formed along the margins of the strip, the driving roller or cylinder has associated therewith means by which it can be intermittently rotated. in either direction, so as to propel the strip back and forth step-by-step, past the means to be influenced thereby. A two-ended jacquard strip 6, is driven by a drum 22 which can be racked in either direction, the strip being drawn off the appropriate one of drums 26, 27 and wound on the other. The winding- on torque for the drums may be produced by springs or weights, or by a common weight 32. The strip may be formed of a series of cards connected together and stored in collapsed condition in bins. The strip is provided with a series of rows of perforations or the like, controlling the pattern when the strip moves in one direction and alternating with a second series operative when the strip moves in the opposite direction. Pins 23 on the drum 22 drive the strip by engagement with marginal holes pitched at the same distance as that between successive rows of perforations and each rack of the drum is twice this pitch, except at a reversal of movement, when a lost motion arrangement provides for an initial single. pitch rack to cause the change from one series of rows to the other. As shown, the jacquard controls needle jacks 1. To select jacks, selector 3 is pushed towards butts 2 on the jacks, against the action of springs 12, by a bar 10. A bar 15 then pivots all of a row of selecting members 5, about a bar 76, so that webs 13 on them are lifted from the strip. The drum 22 is then racked, the webs 13 are replaced on the strip and the bar 10 is restored to its original position. Those selectors 3 corresponding to members 5 whose webs have found holes in the strip will be held forward by lugs 5a on the members; but the other selectors will be free to move away from their jacks: thus a fresh selection is made. The drum 22 may be driven by studs 58 on a take-up drive gear ring 59, star wheel 49, shaft 44, gear 43, a lost motion device, coaxial shaft 36 and worm and worm-wheel 35, 34. To control the direction of rotation of the drum, the gear 43 is made free to rotate on shaft 44 and is driven in one direction or the other as a clutch member 53, slidably keyed to shaft 44, connects the gear to that shaft directly or via a second gear 50, also free to rotate on shaft 44, and an intermediate gear 51. A disc 42, fast with the gear 43, bears a dog 41 which coacts with a semicircular plate 40 on the shaft 36, to transmit the drive and provide the lost motion at reversal. The clutch 53 is controlled by a pivoted arm 62 urged upwardly by a spring 64 and positioned in one or other of its two positions by an element 65 having alternate high and low abutment faces 65a, 65b and racked round by a pawl 67 on a. spring-urged 68 when that slide is released by withdrawal of a sear 70 by a feeler 75 operated by the jacquard strip. The slide 68 is re-set by a cam 80 on the disc 40, acting, through a lever-79, on a pin 82. Alternatively, Fig. 9, the drum may be racked round by a pawl mechanism operated through connections 89, 87, from a cam on the cylinder driving gear 20 and acting on a ratchet-wheel 83 on the drum 22. The ratchet assembly comprises two ratchets 84, 85, pivoted at 86 and pulled together by a spring 94, either one being forced to inoperative position and the other allowed to engage the ratchet, by a polygonal element 95 having an odd number of faces 95a and racked round by ratchet 96 and a spring-urged pawl-bearing slide 98 controlled by the jacquard strip in a manner similar to that used for the slide 68. The reverse racking may be such as to enable the entire strip to make a complete pass or to allow portions thereof to be passed backwards and forwards.