GB717878A - Improvements in carrier rod drive mechanism for knitting machines - Google Patents

Abstract

717,878. Knitting-machines. TEXTILE MACHINE WORKS. June 3, 1952 [June 7, 1951], No. 14025/52. Class 74(2). The friction box 44 for driving the thread carriers of a straight-bar machine is positively driven at the commencement of each traverse in addition to receiving a frictional drive from the friction bar, and is gradually retarded at the end of its traverse to reduce shock on the end stops. In addition to driving the friction bar 55, the coulier mechanism also drives a bar 84 to which is coupled, by means of a clutch, a head 86. The clutch comprises spring loaded rollers 94, one of which is operative in each direction of movement of the bar 84 to securely couple the head to the bar. A projection 102 from the head 86 engages between collars 100 so as to transmit the reciprocatory motion of the bar 84 to a rod 98, and thereby positively drives the friction box 44 by a projection 118 on the box engaging between blocks 116 secured to the rod 98. At the commencement of its traverse therefore, the friction box is directly coupled to the bar 84 and is thereby accelerated without substantial frictional slippage on its rod 55. Stops 122, 123 limit the movement of the friction box, but before it strikes its stop the drive from the bar 84 is disengaged by a plunger 96 of the clutch engaging a block 128. The block 128 is slidably mounted and is coupled through levers with a cam follower 165 which is adapted to ride on a cam 152 of a bar 134, which is reciprocated at half the speed of the friction bar by the coulier mechanism. As the friction bar 55 and bar 134 approach the end of their traverse, the cam follower 165 rides down the cam 152 so that the block 128 moves in the same direction as the friction bar and head 84 and so that the impact between the plunger 96 and the block 128 is reduced. After it has released the clutch, the block gradually stops the movement of the head 86 and the friction bar is brought up to its stop 48 by a second friction box 172. Reverse movement of the friction bar and bar 84 reconnects bar 84 to head 86 to again positively drive the friction box in this direction, where it is again stopped at the end of its traverse by a similar stopping arrangement.