Patent GB-686333-A (GB)
Title: Improvements in knitting machines
IPC: D04B7/04
Filed: 1950-06-15
Abstract: 686,333. Knitting-machines. GRANOV, W. June 15, 1950. No. 14983/50. Class 74 (ii). To enable narrowing to be carried out on a parallel machine, the needles of both beds are actuated by a dual jack arrangement whereby at the end of a course of knitting the loop on a needle at the end of the row of one bed is transferred to an adjacent needle of the other bed and prior to knitting the next course the loop is transferred back to a needle of the first bed adjacent but inwardly of the end needle of the row on which it was initially positioned. The needles 22, 22a of the machine have spring clips 25 secured to them on one side. To enable narrowing to be effected symmetrically at both ends of the needle beds, the clips at one end of each bed are oppositely disposed in respect of the needles to those at the other end. The needles are actuated by their butts 22b engaging knitting cams 34, 35, 37 on the cam plates 23, 24 and are also actuated when selected by transfer cams 30, 31. The needles are also influenced by jacks 26, 27, the jacks 26 having butts 26a operable by cams 38, 39, 41, 42, 43, 44 on the cam plates. The jacks 26 also have rearward extensions which are engaged by a jacquard mechanism situated adjacent the ends of the needle tricks of each needle bed. Jacks 27 effect movement of the needles only through the jacks 26 and have butts 27a which engage cams 45, 46 on the cam plates. The ends of the jacks 27 also engage the jacquard mechanism. During a course of knitting when narrowing is being effected the cam plates traverse the rows of needles and jacks in one direction, Fig. 3. Initially the jacquard mechanism of one bed is operated and selects jacks 26 which will effect their corresponding needles and cause them to be operated by the knitting cams. The jacquard mechanism also selects a jack 27 corresponding to the end needle of the row of needles of the bed. The cams 44 are withdrawn during traverse of the cam plate 23 in the direction of movement shown in Fig. 3 and do not effect movement of the jacks 26. The cams 45, 46 at the leading end of the plate 23 are hinged so as to merely ride over the butt 27a of the jack 27. The needles are raised to their knitting cams 34, 35, 37 by the butts of the jacks 26 engaging the leading cam 38, the jacks 26 being immediately lowered by the cam 39 and following cam 38. After passing through the knitting cams the leading end needle is raised by the jack 27 engaging the following hinged cam 45 which causes the corresponding jack 26 to be raised into engagement with the leading cam 42 and at the same time raising the end needle into engagement with the transfer cams 30, 31. The remainder of the needles pass over reverse transfer cam 33. The projection of the end needle by the cams 30, 31 causes the loop on this needle to extend down over the clip 25 on the needle beneath its latch, Fig. 9. Simultaneously, the needles of the other bed also passing over the cam 33 of the plate 24 causes a needle 22a opposite the extended needle 22 to project between the clip 25 and the needle 22. Subsequent action of the transfer cam 30 withdraws the needle 22 and at the same time the needle 22a is withdrawn leaving the loop on the needle 22a. At the end of movement of the cam plates in this direction the jacquard mechanisms are adjusted to make a fresh selection. In this case the jack 26 operating the end needle 22a of the second bed is raised and as the plates move in the reverse direction, Fig. 6, engages leading cam 44 of the plate 24 whereupon the needle 22a is raised to engage transfer cams 30, 31 of plate 24 which project the needle so that the loop extends over the clip 25 of the needle 22a. Simultaneously the needle inwardly adjacent the end needle of the last course is raised by cam 33 and extends between the needle 22a and its clip. The two needles are then withdrawn by their transfer cams and the knitting proceeds in the reverse direction, the needle at the opposite end of the row having its loop transferred inwardly by similar action of the jacks, the cams 42 being withdrawn and the cams 44 being projected. Also the leading cams 45, 46 are inoperative in this direction. Widening is effected by needle selection.