GB483289A - Straight-bar full-fashioned hosiery machines - Google Patents

Abstract

483,289. Knitting. MILLER, M. C. Oct. 14, 1936, No. 27852. Convention date, Feb. 28. [Class 74 (ii)] A straight-bar full-fashioned foot and leg knitting-machine is provided with an instepfabric supporting bar 224 having a series of loop-lifting points 228 and with means for moving the bar 224 for removing the instep needle loops from the needles so that they are held behind the needle line during the knitting of the heel flaps. Knock-over elements, each having two substantially parallel knock-over surfaces at slightly different levels, as described in Specification 480,686, are employed. The narrowing mechanism for the leg and foot narrowings comprises bars 148, 150, 152, 154 which are actuated by the usual narrowing cams 176 on the main cam-shaft 80, and can be locked in inoperative position by a manually-operated lever 190. The main cam-shaft 80 is moved axially for narrowing by a roller 194 and cam discs 196, 198 under control of the pattern chain 135. Automatic welt setting-up and closing mechanism, and mechanism for laying in a welt wire, as described in Specification 456,145 are provided. An instep bar 224 is provided for each section of the machine, and is supported upon the hanging frame 216 for the welt bar 200. The frame 216 is pivotally mounted upon a rock-shaft 218, which is in turn supported upon arms 220 secured to a shaft 222. The bars 200, 224 are moved forwardly and backwardly of the needles 69 by pivoting about the shaft 218, and vertically with the needles by movement of the arms 220. The instep bar 224, shown in operative position in Fig. 10, is supported upon arms 230 secured to a shaft 232 mounted in bearings formed in the pivot pins 214 for the welt bar 224 so as to have axial movement thereof lengthways of the needle bed. Screws 238 allow the bar 224 and points 228 carried thereby to be adjusted angularly with respect to the arm 230. Extensions 242 of the arms 230 connect the arms 230 rigidly to the frame 212 which carries the welt bar, and angular and axial adjustment of the arms 230 with respect to the welt bar is facilitated by screws 244, 246. The relative positions of the instep bar and welt bar are changed by the machine operator, and a toggle spring arrangement comprising springs 250 holds either bar in operative position. The movements of the frame 216 during removal of the instep needle loops are controlled by cams upon a sleeve member 289 which rotates with, but is axially movable with respect to, the secondary cam shaft 270 for the welt bar controlling cams. The vertical motion cams 286, 288, Figs. 1 and 4, engage rolls upon a cam lever 298 which is mounted upon the shaft 222 so as to be adjustable with respect to the lever 220. During normal knitting, the rolls carried by the lever 298 are centred between and out of engagement with both cams. In and out cams 290, 292 are provided upon a second sleeve 294 and actuate a cam lever 310, Fig. 2, rigidly secured to a rock-shaft 312. A lever 218 also secured to the shaft 312 is connected by a link 322 and lever 328 to the rock-shaft 318 for the frame 216. A pin-and-slot connection 326, 324 allows the link 322 to be released from the lever 328 when the link is raised by a cam-actuated lever 330. A shift rod 296 secured to each of the sleeves 289, 294 is controlled by a cam lever 430, Fig. 1A, having a roll 434 which, by movement of the lever, is brought into engagement with either of three cam tracks upon cam discs 435, 436. The outer track corresponds to normal knitting ; engagement of the roll with each of the inner tracks moves the shift rod to cause the instep cams 288, 292 to be moved beneath their follower rolls 308, 316, and the link 322 to drop into locking engagement with the lever 328. The lever 430 is actuated by stops in the pattern chain 135. Means are provided for aligning the hooks of the welt bar with the needles during setting-up and closing the welt, and for positioning the instep bar lengthways of the needle bed during removal and return of the instep loops, comprising stationary stop screws 492 carried upon th welt-wire guideway 263, Fig. 1. Movement of the instep bar one half a needle index to allow the points to pass between the needles is obtained by endways movement under pattern control of a rock-shaft 496, Fig. 2, supported upon the machine table 65 and carrying stop levers 494 which engage the sides of the guideways 263. Stitch regulating mechanism comprising levers 602 engaging the cam levers 85 for imparting the forward and back movements to the needles is provided. A fabric guideway or support comprising a plate 273 is provided for use when the fabric is disconnected from the usual take-up and the knock-over elements are utilized for fabricholding and taking-up. Mechanism is provided, controlled by the pattern chain 135, to hold the knock-over elements in retracted position during the knitting of the setting-up course. The loop lifting points 724, Fig. 64, of the instep bar 224, may have a notch 725 undercut towards the tip of the point. The edges of the notched portion are bevelled inwardly so that the points may be withdrawn readily.