Patent GB-1098812-A (GB)
Title: Improvements in the driving mechanism of knitting machines
Inventor: WAINWRIGHT HERBERT CARLYLE
IPC: D04B15/94
Filed: 1963-09-04
Abstract: 1,098,812. Knitting-machines. BENTLEY ENGINEERNG CO. Ltd. Sept. 1, 1964 [Sept. 4, 1963; July 23, 1964], Nos. 34915/63 and 29218/64. Heading D1C. [Also in Division F2] In a friction clutch control in aknitting (particularly circular knitting) machine drive, wherein a collar 27 in screw engagement with a non-rotatable sleeve 8 is rotated to axially move, through a bearing 25, a driven friction plate 22 into engagement with, a driving plate 11, power assisted quick release means comprises a toothed wheel 26. rotatable with the driven plate 22 and a catch lever 29 which is pivoted at 28 on a lug 27c of the collar 27 and which, when manually or automatically tripped to engage a cranked end 129b thereof with a tooth of the rotating wheel 26, rotates the collar 27 in the clutch disengaging direction. The driving plate 11 is secured to. an internal gear 13 electric motor driven through a V-belt drive and a pinion. The driven friction plate 22 is riveted to a wide pulley 23 engaged by a belt in selective engagement with one of a set of change speed pulleys. Operation. To engage the clutch, a control lever at the front of the machine is lifted to depress a vertical bar so that a peg thereon depresses an end 129a of the catch lever 29. The latter is thereby rocked about its pivot 28 to press its end 129a on to an arm 27b of the collar 27 to rotate the latter to engage the clutch. The end 129a is then held down by the engagement of a projection 129c thereof by a spring-loaded latch on a fixed pivot so as to hold the catch lever 29 clear of the wheel 27 and to prevent clutch disengagement. The control lever may then be released. To manually disengage the clutch the control lever is depressed to lift the vertical bar so that a further peg thereon pivots the latch to release the catch lever 29 so that its cranked end 129b is spring urged to engage a tooth of the wheel 26 which is rotating with the pulley 23. The catch lever 29 is then pulled round by the wheel 26 thereby rotating the collar 27 in a clutch disengaging direction whereupon a spring 30 assists the rotation of the collar to a position where a fixed stop pin first acts on the catch lever end 129a (as the collar is rotated to disengage the end 129b from the wheel 26 and then acts through the end 129a and the arm-27b to stop rotation of the collar. The clutch may be automatically disengaged by a solenoid actuated by fault detectors associated with the yarn or knitting elements, the solenoid having a hook acting on the spring-loaded latch. To adjust clutch engaging pressure the vertical bar is depressed so that the projection 129c is nicely engaged by the latch; then, with the motor running, a screw 52 is adjusted to axially move the sleeve 8 sufficiently to effect clutch engagement without slip, excess loading of the pulley 23 due to a machine fault causing slip in the clutch and minimising machine damage. The screw 52 has friction means preventing unscrewing by vibration. The toothed wheel 26 may be fixed to the pulley 23 or gripped thereagainst by the collar 27 during clutch engagement in which latter case it is unnecessary to disengage the catch lever 29 from the wheel 26 on clutch release.