Patent GB-119478-A (GB)
Title: Improvements in and relating to Circular Knitting Machines.
IPC: D04B9/10
Filed: 1916-01-24
Abstract: 119,478. Marks, E. C. R., (Georgetown Foundry & Machinery Co.). Jan. 24, 1916. Circular machines.-Comprises improved needle and cam arrangements for circular machines having superposed rotary cylinders. Double-heeled jacks and needles are employed, of which the heels 94<a>, Fig. 25, engage the transfer cams, whilst the heels 95a engage the knitting-cams. The jacks are cut away to permit rocking without necessitating wide spacing of the cams from the cylinders. The upper cylinder cams comprise knitting-grooves 107, 108, Fig. 17, into which the heels of the jacks and needles are directed by a cam 111, a transfer track 113 into which the heels are directed by a cam 112, and idle tracks 106, 198. The lower cylinder cams comprise knitting- tracks 118, 119 furnished with double knitting- cams 120, 123, non-knitting tracks 116, 117, transfer cam 125, switch cam 133, pivoted cam 124, guard-cam 135, and narrowing and widening pickers 128, 129, the picker 128 being notched at 136 for the passage of the lower heels. The cams 111, 112, 125 are movable radially and are controlled through levers &c. by a pattern drum 47, Fig. 1, the jacks and needles being provided with long and short heels so that the cams can be introduced in two stages. In the top cylinder are arranged dummy jacks b. Fig. 25, alternating at the back with transfer jacks g, h, co-operating with transfer needles 93 and at the front with jacks g and non-transfer needles a; whilst in the bottom cylinder are arranged transfer jacks g and non- transfer needles e at the back and dummy jacks b, transfer jacks f and non-transfer needles d at the front. The needles and jacks in the front of the lower cylinder are provided with long upper heels for engagement with the switch-cam 133 which is controlled from the pattern drum 47, Fig. 1, through a lever 164 and link 165. The pickers 128, 129 are provided with levers 147, 150, Fig. 20, under the influence of springs 149, 152, the picker 129 being brought into operation by means of a member 146 carrying stop-pins 148 and operated by pins 144 on a ring which is positioned by a lever operated by a cam on the pattern drum 47, Fig. 1, and is actuated by a cam on a vertical shaft 6 which is oscillated during reciprocating knitting. The invention is shown embodied in a complete machine which includes the following features:-(1) Change-motion: A shaft 1, Figs. 1, 3, and 5, fitted with a fast pulley 2 and a slow drive pulley 3 having internal reducing-gear, drives a countershaft 4 through sprocket trains 13, 14; 15, 16, and 17, 18, and clutch members 19, 29. A crank-pin 24 on the sprocket 16 imparts an oscillatory drive through a slotted bar 26 connected at 28 to a chain 22 passing over a sprocket 21 connected to a clutch 20 on shaft 4. The shaft 4 drives through bevel gear 5 the shaft 6 which drives, through gears, the top and bottom cylinders and the fabric take-up supporting-disk 12. Control of the clutch member 29 on the shaft 4 is effected by a slide 70 furnished with upper and lower arms adapted to be engaged by a cam 71 on a sleeve 72 keyed to the shaft 6, the sleeve being controlled by the pattern drum 47 through a lever 74. The fast and slow drive through the pulleys 2, 3, is controlled by a belt-shifter 78 which is moved by a #-shaped cam 82 on the shaft 4 engaging either of two spring bolts 80 on the belt-shifter slide 76. The bolts are normally raised out of range of the cam by springs and are depressed by inclines 84 on a slide 83 which is moved in and out by an arm 86 on a rock-shaft 85 operated by a pattern drum 49 through cams 90 and a lever 88. (2) Fabric take-up : Rollers 32 mounted in standards 31 on the disk 12 are connected by gears 34, Fig. 16, pressed together by springs 33 and are driven through a gear 35 and worm gear 39 by an internal gear 41 frictionally held by a brake 42. To enable the work to be pulled back for examination, the gear 35 is connected to the roller spindle by a spring clutch 195, Fig. 3. (3) Pattern drive: The shaft 48, Fig. 1, carrying the pattern drums 47, 49 is driven through a ratchet 67 by a pawl 68 connected to a lever 57 operated through a rod 53 by a cam 52 on a cross-shaft 50 geared to the shaft 1. The pawl 68 normally rides idle over a rod 65 supported by pins 66; the rod being drawn back, to render the pawl operative, by a lever 64 operated by indications 63 on a pattern chain 61 passing over a sprocket 60 loose on the shaft 48 and operated by a pawl 58 connected to the lever 56. (4) The spring take-up lever 177 is controlled by cams 183 on the drum 47 acting through a rod 186.