Patent GB-626934-A (GB)
Title: Improvements in knitting machines
IPC: D04B11/06
Filed: 1946-01-09
Abstract: 626,934. Knitting-machines. DEHN, F. B. (Textile Machine Works). Jan. 9, 1946, No. 823. [Class 74 (ii)] The narrowing head of a full fashioned machine having a reciprocating actuator 47 with pawls 50 ... 54 which drive ratchets 57, 58, 59, 61, and thereby rotate spindles 34 and 36 to determine the traverse of the carrier rods and the position of the transfer points, is provided with a latch-lever 161 which engages the ratchet 57 on the carrier rod stop spindle 34 to prevent rotation of the spindle in a widening direction when a carrier rod strikes its stop during widening. The actuator 47 is operated by cams on the main cam-shaft to impart a motion to the pawls such that they rotate the ratchets and spindles in either a narrowing or widening direction. Two pawls 50, 52 operate to move the spindles in a narrowing direction and the pawls 51, 53, 54 move the spindles in a widening direction, pawl 54 operating on the downward movement of the actuator and the other pawls operating on the upward movement of the actuator. Cams 67, 68 connected by a rod 69 are mounted on spindles 34, 36 respectively and are operated through a link 136, controlled by mechanism connected to the pattern chain, to move either the narrowing pawls 50, 52 or widening pawls 51, 53 to an inoperative position, pawl 54 being rendered inactive by cams through linkage 81, 83. A linkage 86, 81 connects pawls 51 and 54 such that the rendering of pawl 54 inoperative renders pawl 51 inoperative. Discs 141, 142 are fixed on spindles 34, 36, and are provided with notches engaged by plungers 143, 144 to hold the spindles in an indexed relation to the needles. The plunger 144 engages the disc 142 on the narrowing points spindle 36, and is raised and lowered by action of the notches on the end of the plunger as the disc is rotated with the spindle 36. The notches in the disc 141 on the spindle 34 are of buttress formation to prevent rotation of the spindle in response to impact of the carrier rods on their stops. A plunger 145 connected to plunger 143 is raised by a lug 149 on a plate 148, attached to a lever 62 pivoted about the shaft 34, so that plunger 143 is disengaged from the disc 141. During widening by the carrier rods only, when pawls 21, 53 and 54 are operative and the narrowing machine is inoperative, a position is attained when the plunger 143 is removed from engagement with disc 141 and at the same time a carrier rod strikes its stop. To prevent rotation of the spindle 34 in a widening direction when the plunger 143-is inoperative, the latch 161 pivoted about a shaft 84 engages the ratchet 57. An arm 162 fixed to the lever 62 which is connected to the actuator 47 at 64, pivotally supports a finger 164 carrying a projection 176. A bolt 169 protrudes from the latch 161 so that when the lever 62 is rotated on the downward movement of the actuator the projection 176 slides over the bolt and drops below the level of the bolt. Upward movement of the actuator swings arm 162 and causes the projection 176 to engage beneath the bolt 169 to raise the latch 161 and permit the pawl 51 to rotate the spindle in a widening direction, plunger 143 being raised by the action of the lug 149 on plunger 145. As lever 62 is further rotated, the projection 176 is disengaged from the bolt 169 allowing the latch to drop and engage ratchet 57 at the same time as the pawl 51 comes to the end of its motion. A link 160 connected to a depending arm 159 of the latch 161 moves the latch to an inoperative position when the pawl 50 is disengaged from the ratchet 57 so that the spindle may be readily moved to a widening position.