Patent GB-528566-A (GB)
Abstract: 528.566. Knitting-machines. SCOTT & WILLIAMS, Inc. Feb. 7, 1939, No. 4009. Convention date, Aug. 30, 1938. [Class 74 (ii)] A circular machine having yarn - changing means including a selector member 24, the position of which determines the yarn changes, has primary and secondary patterning devices for positioning the member 24, and control means through which each patterning device can independently position the member 24. The secondary patterning device normally operates through a number of cycles for each cycle of the primary patterning device and the secondary patterning device can be stopped or allowed to advance while the member 24 is controlled by the primary patterning device. The invention is described in connection with the machine described in Specification 301,350, [Class 74 (ii)], i.e., a machine in which the yarn guides b of a superposed cylinder machine 2, 4 are selectively moved into feeding position by means including levers 8 pivoted at 10 and rocked by cams 16 driven by ratchets 18 advanced by pawls 20 mounted on a continuously oscillating frame 26 ; as the frame rises from the position shown the pawls are selectively allowed to engage the ratchets by an endwise movable scalloped selector member or slide 24. The control for the slide 24 comprises a lever 32 which engages the slide at 34 and is rocked on its pivot 33 by connections 35, 37 from the primary pattern chain 39, and a supplementary pattern chain 80 which controls cyclical striping of a stocking, e.g., of the leg and instep. The yarn changes for the production of heels and toes and for tipping are controlled by the pattern chain 39 acting on the member 37. The chain 39 may also have lugs thereon acting to produce striping additional to the cyclical striping produced by the chain 80. The connection between the pattern chain 80 and the slide 24 comprises a pin 38 on the lever 32 and a cam 40 which moves the pin a selected distance. The cam 40 is formed on an angle lever 42 pivoted at 44 and rocked anticlockwise by the engagement of a block 64 thereon by a screw 62 on a lever 56 pivoted at 44 and having a follower 76 raised by lugs 78 on the chain 80. The chain 80 is advanced by a cam 104 which urges clockwise a lever 98 pivoted at 83 and having a pawl 96 which engages a ratchet 86 secured to the chaincarrying sprocket 82. A brake 88 prevents overrun of the chain. When the stocking leg is finished, and the heel formation is to take place a cam 128 on a cam drum 136 advanced under control of the chain 39 depresses one arm 126 of a lever 118 pivoted at 120 and raises the other arm, thereby (1) causing a stud 74 to move the (pivoted) block 64 out of the way of the screw 62, so that the connection between the chain 80 and slide 24 is broken, and (2) raising a link 114 to interpose a bluff between the pawl 96 and the ratchet 86. The chain 39 then controls the slide 24 to effect yarn changes in the heel. When the heel is completed the cam 128 moves off the arm 126 and the movements (1) and (2) above are reversed. When the toe is reached the low cam 130 rocks the lever 118 to disconnect the parts 62, 64, but not to such an extent that the pawl 96 is immediately bluffed; instead, a cam 138 on the lever 118 is moved into the path of a pin 140, Fig. 4 (not shown), on the chain 80, the pin raises the cam 138 and hence the lever 118 and link 114, and the pawl 96 is again bluffed, the chain 80 stops and the lever 118 remains propped up on the chain with the chain in its initial position. The chain 39 then controls the slide 24 to effect yarn changes in the toe. That position of the chain 80 in which the pin props up the lever 118 is the initial position thereof. When the next stocking is begun and an unpatterned rib top is being made, the cam 130 moves off the arm 126, but the lever 118 remains propped up by the pin. When the leg is to be made the high cam 134 raises the lever 118 high and causes a pawl 112 connected to the said lever to advance the ratchet 86, thus disengaging the pin 140 (not shown) from the cam 138, allowing the lever 118 to drop, unbluffing the pawl 96 and allowing the chain 80 to effect cyclical striping in the leg. Non-cyclical striping may be produced in the leg or instep by engaging the arm 126 with a cam as high as the cam 128.