Patent GB-189709347-A (GB)
Title: Improvements in Yarn Feeding Mechanism for Knitting Machines.
Inventor: BURLEIGH JOSEPH ALBERT
Filed: 1897-04-13
Granted: 1897-06-12
Abstract: 9347. Burleigh, J. A. April 13. Circular knitting - machines. - Relates to the machine described in Specifications No. 2756, A.D. 1896, and No. 1466, A.D. 1895. The object of the invention is a yarn-changing mechanism which enablestwoyarns of different colour or quality to be fed alternately. The main yarn 800 for feet and legs of stockings is carried on a fixed plate 50 and passes through guides 61, 671, 712 and through the hole 538 in the main thread-carrier. The alternate yarn 810 for heels and toes is carried by a spool on a spindle on a cross-bar 700 on the frame 670, 680 which is carried by and rotates with the cam cylinder 240. The yarn 810 passes through the eyes 691, 721, 722, 741, 713 and hole 548 of the alternate threadcarrier. The eye 741 is on a tension spring 740, the heel of which is provided with a spring 746 and cord 745 fixed to an adjustable collar 797. The threadcarrier consist of inner parts 535, 545, with holes 538,548, sliding on pivoted outer pirts 531, 541. The inner parts arepulled by springs 534,544 against pins 513, 514, so that, when the carriers are raised on their pivots, the inner parts are forced inwards by the pins, thus bringing the yarn into an inoperative position inside the needles, as in Fig. 7. The carriers are raised on their pivots by cams 551, 552 on a sliding bar 550 moved to the right by a pin 555, connecting-rod 590, 581, and.disc 580, and to the left by a cam 600. The disc 580, and cam 600 are on a stud 570, which has a star-wheel 610 with eight teeth which come in contact with studs 625, 626 on a slide 620 which is moved inwards at the required times by a lever operated by bits on a pattern-wheel. In commencing a heel or toe, the parts are in the position of Fig. 10, the main carrier 535 being in the operative position, its shank being between the cams 551, 552, and the other carrier in the raised inoperative position, its shank being on the raised part of the cam to the left of 552. When the pin 625 strikes the star-wheel, it rotates one-eighth of a revolution, and the cam 600 moves the bar 550 to the left and the carriers 545 become operative ; both yarns are knitted till the pin 626 strikes the star-wheel, which causes the cam 551 to raise the main carrier 535 out of action, Fig. 12. Before the pouch is completed, the slide 620 is again operated and the star-wheel moved a quarter of a revolution without affecting the position of the carriers. When the pouch is completed, the slide 620 is again moved inwards and remains in this position for two revolutions; the pin 625 strikes the wheel 610, and by means of the rod 590 moves the bar 550 to the right, and both carriers knit till the projection 626 moves the bar another step and throws the carriers 545 out of the main carrier 535 in action : the other two motions of the wheel bring the parts to the initial position without altering the carriers. When not in use the yarns form long loose loops inside the fabric. The carriers are provided with projections which fill the gap in the latch guard 520.