Patent GB-630008-A (GB)
Title: Knitting method and machine
IPC: D04B9/26
Filed: 1946-01-02
Abstract: 630,008. Knitting. NEWTON, E. P. (Scott & Williams, Inc.). Jan. 2, 1946, No. 185. [Class 74 (ii)] A circular sliding-needle knitting-machine comprises at least two means for feeding wrap yarn to needles, means for effecting simultaneous rotation of said wrap yarn feeding means and the needle cylinder and means for effecting individual and independent shogging movements of the wrap yarn feeding means relative to the needle cylinder. Wrap-finger shogging.-Wrap-fingers 70, 78, having butts at four different levels, are carried on externally-toothed rings 58, 60, rotated with the needle cylinder through planetary geartrains. Either ring can be shogged by a translatory movement given (through linkwork) to the final gear in its driving train by pins 178 or other elements on a disc 182 driven from a pattern drum 194. Selecting and actuating wrap-finger cams.- Pattern elements 196 carried on the drum have butts 198 which, through rock-shaft and levers, move wrap-finger actuating edge cams 246, 264 vertically from one to another of three positions. To move cam 264 from the position in which it engages the uppermost wrap-finger butts to that in which it engages the next lowest, a plunger 277 is depressed to compress its spring 279. This " pre-selects " the cam until a projected wrap-finger, by engaging a rod 274, swings a lever 272 and disengages a collar 269 from a plate 268 so that a slide 261 carrying the cam 264 can be snapped by the spring to its next lowest position, with the plate 268 resting on a member 281 held up by a stronger spring 282. When the wrap-finger clears the rod 274, a spring 273 swings lever 272 to bring collars 269, 270 above and below plate 268. To bring cam 264 to its lowest, inoperative, position, plunger 277 is further depressed, to depress member 281 positively, so compressing spring 282 until another projecting wrapfinger engages rod 274, whereupon plate 268 is freed and spring 279 snaps it down on to member 281. On release of rod 274 by the wrap-finger, flange 270 is swung over plate 268. Upon release of plunger 277, reverse movement occurs, under spring action, when rod 274 is engaged by a projected wrap-finger. Rod 274 may be moved from the paths of projected wrap-fingers by means of wire 275. In a modification, Fig. 28 (not shown) there are wrap-finger butts at two levels only and the upper edge cam has only two positions, between which it is moved by an arrangement in which, in effect, one of the collars 269, 270, and the member 281 and spring 282 are dispensed with. Wrap-yarn placing.-Any tendency for the needles to miss a wrap-yarn is corrected by a yarn placer arm 314 carried by an element 310 pivoted on an inclined pin 300; a spring 318 normally urges an extension 312 of the element 310 into engagement with an abutment screw 308. As a wrap-finger approaches the wrapping point, its lower end, moved outwardly by its edge cam, clears arm 314, but engages an arm 322 positioned slightly beyond and above arm 314. Arm 322 is pivoted on the element 310, but is held back against a stop by a spring 326 which is stronger than spring 318. Element 310 is therefore rotated against the action of spring 318 and at such a rate that a point on the arm 314 which has been engaged by the yarn will move forwardly and downwardly faster than the adjacent needles, the yarn being swept to a position in front of the first needle rising to take it and extending approximately radially across the needle cylinder. As the yarn engages a wrap-horn abutment 292 and the first needle engages the wrap yarn, the extension 312 engages an ear 304 and element 310 is arrested. Arm 322 now swings on alone (extending spring 326) until the wrap-finger clears it, when it is snapped back by spring 326, the other elements being thereafter returned by spring 318. Needle selection and reverse plating.-Selector cams may move the lower ends of pattern jacks selectively to any one of three positions, namely, an outer position, resulting in the associated needle being raised at the first wrap point ; an intermediate position, leading to rise of the associated needles at the second wrap point ; and an inner position, resulting in associated needles being raised after missing both wrap points. As a needle rises at a wrap point, it carries up its presser jack 24 until a projection 25 thereon snaps past an associated slider 28. The needle then takes a wrap yarn or not, depending on whether or not one is presented to it, and subsequently takes yarn from one or more main yarn fingers and knits. At the point where the stitches are drawn, the sliders 28 may be engaged by a cam and those needles which were raised at either wrap point will be deflected inwardly, about associated cleaning jacks 14 as fulcra, to produce reverse plating of the main yarns. For reverse plating on needles lying between closely adjacent wrapped panels, the needles are not raised at either wrap point ; but the presser jacks 24 are provided with butts of differing lengths, and certain thereof, which have previously been raised to reverse plating level are lowered selectively. Needle support and alignment and loop transfer.-Those, 28a of the sliders 28 associated with the cylinder needles which are active during rib knitting have the upper portions of their outer edges cut away to miss a cam 332 which is swung in to active position by the main cam drum at the end of rib knitting. The sliders 28b associated with the idle cylinder needles have continuous outer edges and are engaged by the cam when the previously inactive cylinder needles are raised to receive the dial loops. Their needles are therefore deflected about their cleaning jacks to align them with the dial loops. The cleaning jacks also impart rigidity to those cylinder needles knitting during rib work. Fabrics.-Fig. 27 and Figs. 30-32 (not shown) illustrate, diagrammatically, portions of patterned fabrics : reverse plating is indicated by shading, and wraps by crosses and circles or by -heavy cross-hatching.