GB487067A - Improvements in or relating to circular knitting machines of the double axially opposed needle cylinder type - Google Patents

Abstract

487,067. Knitting- machines. STIBBE & CO., Ltd., G., STIBBE, E. V., and BARSBY, E. S. Jan. 1., 1937, No. 77. [Class 74 (ii)] In circular knitting-machines of the double axially opposed, e.g. superposed, needle cylinder type having double-ended needles and associated sliders, the sliders 7, or jacks associated therewith, have triangular patterning butts 8 which are selectively engaged by the bevelled ends of a bank of sliding blades 11, actuated by a pattern drum 28, to effect endwise movement of the sliders for, e.g. initiation of transference of selected needles. The blades 11, or the butt-engaging ends thereof, are inclined to the horizontal, e.g. at 30‹, and are normally held inoperative against the action of springs 25 by engagement of offset lugs 12 thereon with one end 30 of pivoted levers 27 cam-rocked from the pattern drum 28. Each blade 11. is bevelled at one end 13 and at one edge 14. When a blade 11 is moved inwards the engaged slider rides down the slope thereof, the large butt 71 engages a yieldingly-mounted cam 68 and rides down the inclined surface thereof and the transfer butt 69 engages a fixed portion 70<1> of a twopart cam 70 whereby full transference of the needle is effected. The part, 70<11> of the cam 70 is spring-controlled and moved from timing mechanism, and normally held out of the way of the transfer butts of unselected sliders. The blades may be held inoperative by springs and moved to operative position by the levers 27 ; or, instead of the blades 11 being spring controlled, the levers 27 may be spring controlled ; or the levers 27 may be replaced by sliding members acting on the outer ends of the blades; or the blades may be pivoted and controlled by springs and the pattern drum ; the drum may act direct on the outer ends of the blades which ends may be chamfered, mitred or rounded. The drum 28 is rotated by a pawl-and-ratchet device from a cam 47 on the rib cylinder shaft 48 via a pivoted link 50. The pawl-and-ratchet device may be rendered inoperative at predetermined intervals by the interposition between the pawl and the ratchet of a bluff 55 formed on a circular plate 54 rotated by a link 56 moved by a bell-crank 58 from timing mechanism ; at such intervals all the blades 11 are withdrawn from action by means of an element 64 connected to one arm 59 of the bell-crank 58, the element engaging the recessed portions 66 of the levers 27 and rocking them clockwise.