GB715676A - Improvements in or relating to straight bar knitting machines - Google Patents

Abstract

715,676. Knitting-machines..THIEDE, W. O. April 9, 1951 [April 12, 1950], No. 8955/50. Class 74 (2) In a straight-bar machine a device such as a lead screw for adjusting thread carrier travel is intermittently actuated through a consantly rotating driving member having at least one ,projection slidable thereon between a position in which it will engage one of a plurality of slots spaced equidistantly around and extending inwardly from the periphery of a rotatable driven member and a position in which it will avoid the driven member. Shaft 8, Fig. 1, is intermittently rotated by a constantly rotating shaft 1, by the engagement, under pattern control, of pins 4 or 5, carried on a drum 2 on shaft 1, with slots 23 or 24 of a Maltese Cross 9 on shaft 8. The pins are mounted in pairs 4, 5 on slides 3 carried around part of the circumference of the drum 2 and movable longitudinally thereof, one way or the other, by cam plate 11 or 12 lowered into the path of pins 4 or 5. Plate 11 or 12, when operative, causes the associated pins 4 or 5 to follow such a path that each of the other pins 5 or 4, in turn, engages a slot 23 or 24 to turn shaft 8 through 90 degrees in one direction or the other. A fixed cam plate 20 returns the pins to their former path. Between successive rotations, the shaft 8 is located by coaction of the nose of a spring-urged' lever with notches in a disc 10 on shaft 8. The pairs of pins may be of two or more differing lengths, and the cam plates movable from the inoperative position into different operative positions, in which they engage some or all of the pins. In a modification, Figs. 8 and 9, driving pins 84 are carried by slides 83 movable radially of a constantly rotating disc 82 by means of a groove 91b in a gate 91 swingable from the position of Fig. 8, in which the pins are caused to follow a circular path 101 into a position in which the groove diverts the pins into a V-shaped track 88, 89 which causes them to enter the slot 98 of a Maltese cross 97 and so rotate' shaft 96, a quarter-revolution at a time. The gate 91 is swung to the shaft driving position for differing periods by cams 103 or 104 into the path of one or other of which a cam follower 94 is brought by one or other of lugs 113, 114 of differing height on a chain 112. The direction of rotation of a shaft 119, driven by shaft 96, is determined by a cam drum 124 which, through a spring- returned bell-crank 120, shifts a clutch 118, slidably keyed to shaft 119, from one to the other of bevel gears 116, 117, rotatable on shaft 119 and driven by a bevel wheel 115 on shaft 96. The device may be used to rack a lead screw controlling the stroke of thread carrier rods Fig. 7 (not shown) or controlling splicing stops or narrowing points, or for racking control shafts or control drums.