Patent GB-711523-A (GB)
Title: Improvements in draw off tensioning means for knitting machines
IPC: D04B15/88
Filed: 1952-04-10
Abstract: 711,523. Knitting-machines. TEXTILE MACHINE WORKS. April 10, 1952 [April 12. 1951], No. 9268/52. Class 74 (2) A multi-section straight-bar machine has welt wire engaging hooks attached to straps which are moved by the draw-off shaft towards or away from the needles, the draw-off rollers being releasable from the draw-off shaft for locking in a fixed position. The straps 133 are wound on collars 91 at the end of each draw-off roller 87, the collars 91, Figs. 10, 14, having a spring connection with elements 96 secured to the draw-off shaft 65. The rollers 87 are normally connected to the collars 91 for rotating with the shaft 65, by sliding bolts 83, but the bolts 83 may be withdrawn by stops 80, Figs. 2, 5, 10, carried on a shaft 70. The stops 80 lock the rollers in fixed position and release the collars 91, enabling the shaft 65 to be rotated to advance the straps .33 towards the needles in slideways 143. Prior to the locking of the rollers 87, the shaft 65 is located in a predetermined angular position. The shaft 70 is rotated by a handle 75, Figs. 17, 22, and the shaft 65 rotated by hand so that a cam 68 on an arm 69 secured to the shaft 70 engages a surface 67 on a disc 66 secured to the shaft 65. The shaft 70 is then further rotated to drive home the elements 80. The final movement of the shaft 70 causes the arm 69 to set a latch 108 to lock the shaft 70 against return. The latch 108 carries a spindle 157 on which slides a traveller 160, Figs. 17, 18, and the setting of the latch places the traveller in a worm 164 on the shaft 65. The shaft 70 carries an arm 191 and the above final movement causes this arm to release a pawl 117 connecting the shaft 65 to a weightoperated pulley 118. The shaft 65 is turned in the reverse to draw-off direction by a handle 130 and gears 121, 122 at the same time advancing the welt hooks 64 towards the needles, winding up the weight on the pulley 118 and causing the traveller 160 to move to the right. When the hooks are sufficiently advanced, the traveller 160 engages an arm 159 tripping a latch (not shown) which locks the shaft 65 in fixed position. A welt wire 136 is then introduced into guideways 166 in rails 58 via slots 178, Figs. 2, 5, 14. .When part of the welt has been knit, the welt turning means which may be as described in Specifications 598,468 and 598,526 advances the welt-hooks 54 to a half-way position towards the needles. This movement causes the shaft 65 to be released and to rotate under the action of the weight, winding up the straps 133 and drawing off the fabric., The traveller 160 moves to the left and eventually is thrown off the worm by a stop 186, Fig. 18, tripping the latch 108. The shaft 70 returns under the action of a spring 74, releasing the rollers 87 which are then locked to the shaft 65 by the bolts 83. A projection 226 on the pulley 118 moves a lever 213, Figs. 17, 22, to bring a rod 227 into engagement with an arm 230 or. the madhine presser shaft 231, whereby the drawing off is taken over by a spring motor, the arrangements for achieving this being substantially as described in Specification 598,468. Specification 594,290 also is referred to.