Patent GB-623403-A (GB)
Title: Improvements in or relating to knitting machines
IPC: D04B27/08
Filed: 1946-07-08
Abstract: 623,403. Knitting-machines. DEHN, S. G. (Vanity Fair Mills, Inc.). July 8, 1946, No. 20355. [Class 74 (ii)] The hook needles 162 and hook closing tongues 165 of a warp knitting-machine have an arcuate motion combined with a vertical reciprocating motion, and the sinkers 158 have vertical as well as horizontal movement. The various knitting elements of the machine are operated from two cam-shafts 13, 14, Fig. 40, the shaft 14 running at twice the speed of the shaft 13. Needles, tongues and sinkers.-The vertical reciprocating motion of the needles and tongues is transmitted from an eccentric 240 on the shaft 13 to a rod 71, the head 72 of .which carries needle and tongue bars 75, 83. The tongue bar 83 has supporting shafts 81 sliding in bearings in the head 72. The rod 71 is slidable in a bearing 70 secured to a rock-shaft 22. The rock-shaft 22 is actuated by eccentrics 228, 229 on the shafts 13, 14, the straps of which connect to a cross-beam 232 joined by a link 234 to an arm 233 rigidly secured to the shaft 22. The arm 232 is steadied by a bearing 237 and a plunger 238. A similar eccentric drive to that rocking the shaft 22 serves to operate the tongues to close the needle hooks by rocking a bell-crank lever 245 on a shaft 244. One end 250 of the lever 245 is connected by a pivoted adjustable rod 247 to a plunger 248 operating in a bearing 243 and attached to the tongue bar 83. The bearing 243 is attached to a bracket secured to the shaft 22, the bracket having a vertical guide similar to the bearing 70, in which a supporting plunger attached to the tongue bar 83 is arranged to slide. The sinkers 158 are operated from an eccentric on the shaft 13 through a bell-crank lever 265 mounted on a shaft 264. One end 266 of the lever 265 is attached to a pivoted adjustable rod 270 operating a plunger 269 to which is attached the sinker bar 101. The plunger 269 slides in a bearing 268 secured to the shaft 22. To eliminate the rocking of the sinkers, the bearing 268 may be left free on the shaft 22 and secured by an adjustable rod to a part of the machine frame. Thread guides 178 are carried on guide bars 177 attached to bearings 175, Fig. 5, secured on splined thread guide racking rods 171, 172. The rods are operated by pattern cams on a shaft 185, Fig. 1, driven by the shaft 13 through worm gearing 18, 188. Each shaft 171 or 172 is adjustably attached to a lever 184 pivoting on a shaft 182, by adjustable pivoted connections 202, 203. Each lever 184 is rocked by two of the pattern cams acting on adjustable trucks 194. Thread control mechanism.-An upper and a lower thread control mechanism are each operated by an eccentric mechanism similar to that rocking the shaft 22, the mechanisms rocking arms 23, Fig. 5, turning on the shaft 22. Each arm 23 is connected by a rod 50 to a carriage 214 sliding in brackets 205, 222 attached to the machine frame and having cuffs bearing on the rods 171, 172. Each carriage 214 carries a plate 219, the lip 220 of which engages the thread T stretching between spring-loaded rollers 211, 213. The raising of the carriage 214 lets off thread, the amount let off being adjustable by means of an adjustable plate 216, secured to the bracket 205 or 222, having a lip 217 which takes the thread off the lip 220 as the carriage 214 is raised. The thread passes over plates 223 to the thread guides. In the case of the upper thread, a roller 221 is placed between the roller 211 and the plate 223, the thread passing over it. Fabric take-off mechanism.-The fabric may pass from the sinkers over a roller 283, Fig. 40, to a take-off beam 288. The roller 283 may be oscillated by the shaft 22 through an arm 284 connected by links 285, 282 to swing the roller 283 about a shaft 281. In the above mechanisms, the arms 23, 233, 245, 265, 284 and the eccentric cross-beams are slotted for adjustment. In an alternative embodiment of the invention the sinkers and tongues may be operated by horizontal bellcrank levers 122, 114, Fig. 5, pivoted in bearings 92, 93 carried by a bracket 91 secured to the shaft 22. One arm of each bell-crank lever connects with a swivelled block 117 or 124 attached to shafts 119, 126 sliding in bearings in the bracket 91. The other arm of the lever 122 is joined to the vertical guide 77 in which the plunger 80 attached to the tongue bar 83 slides, while the other arm of the lever 114 is joined to the sinker bar 101 by a lever 120. The sinker bar 101 is also supported by a rod secured to it and which slides in a horizontal guide 98 forming part of the bracket 91. The tongue bar 83 has supporting rods 81 which slide in horizontal bearings 73 carried by the needle operating plunger 71. The rods 119, 126 are rocked by cams on a cam-shaft driven by worm gearing from the shaft 13, the cams operating levers to which they are pivotally attached. At least two of each of the eccentric drives for the needles, tongues, sinkers, yarn let-off and fabric take-off are incorporated in the machine. Specification 601,020 is referred to.