Patent GB-795900-A (GB)
Title: Needle actuating mechanism for knitting machines
IPC: D04B7/04
Filed: 1956-04-10
Abstract: 795,900. Knitting-machines. KAHLSSON, E. A., and DAHLQVIST, G. A. April 10, 1956 [April 12, 1955], No. 10923/56. Class 74 (2). A pattern-controlled unit provides needleactuating impulses which are distributed to predetermined needles of a flat-bed sliding-needle machine, through a second unit operatively connected to the first unit and including a series of independently movable members which extend parallel to the needle bed and have needle actuating arms detachably connected thereto. As a chain 5 is driven by a pulley 7 (to reciprocate the cam carriage 2 through a link 4), cams 8, 9 on the chain each, in turn, rock an arm 10 and so, through a Bowden wire 12, rock an arm 14, to rack round a pattern chain, through pawl 16 and ratchet wheel 18. The upper part 26 of each of a series of swingable arms 25 is slotted to carry a rocket lever 28 linked by a wire 32 to an arm 30 urged by a relatively strong spring (not shown) to bear against the surface of the pattern chain, the members 28, 30 having then the full-line configuration of Fig. 3. When, however, a stud 43 on the chain passes under the arm 30, a relatively weak spring 34 is enabled to swing the members 28, 30 into the dotted-line position of Fig. 3, the obliquely cut lower end of the arm 28 abutting against the similarly cut end of its containing slot, which acts as a stop. Any arm in this dotted-line position of Fig. 3 (also shown in full line in Fig. 2) is in the path of a rod 23 carried by plates 22 which are rocked clockwise, through a projection 20, by the arm 14, as it swings. Thus any arm 25 having an arm 28 influenced by a lug on the pattern chain will be swung counterclockwise (Fig. 2) as the arm 14 swings clockwise and, through a wire 35 and arm 36, will oscillate a rod 37 bearing, at predetermined positions thereon, arms 40 linked to needle actuators. The members 37, 40 and the needle actuators thus distribute to selected needles an impulse from the pattern chain. In the modification of Fig. 5, the pattern chain is replaced by a perforated jacquard band 65 advanced by a drum 63 racked round by a pawl 67. By means of eccentrics operated by the machine driving motor, the pawl 67 is operated, plates 50 carrying a rod 51 are swung about a pivot 45 and a plate 53 bearing a row of holes 55 is swung around a pivot 52, all in properly timed relationship. In operation, the jacquard band is racked on by a stroke of the pawl 67 and the plate 53 is swung upwardly. Any pins 58 to which holes have been presented by the jacquard band will be able to remain stationary, by reason of the holes in the frame 53. The remaining pins will be lifted and will lift the hooked ends 61 of associated bars 60 into the path of rod 51 as it now swings back. The bars 60 are connected by wires 62 to the arms 36 of Fig. 1 and, hence, as before, a pattern impulse is distributed to selected needles. The plate 53 and the rod 51 are now returned to their rest positions and, as the pawl 67 makes its next stroke a rod 73 on an arm assembly 71 pivoted at 70 is swung down to force all the bars 60 to their rest positions. Some of the arms 25 or bars 60 may be connected to a yarn changing device.