GB642682A - Heel fashioning mechanism for straight bar knitting machines - Google Patents

Abstract

642,682. Knitting- machines. LIEBERKNECHT, Inc., K. Sept. 11, 1947, No. 24985. [Class 74 (ii)] A straight-bar machine is adapted for knitting heel tabs by the inclusion of elements which press end groups of needles from behind against the presser bar, the normal pressing movement of the needle bar being prevented during the formation of the heel, the elements resting on and rising and falling with the the needle bar. The elements 100, 101 are pivoted at 102 to rise and fall with the needle bar 20. Their pressing movements are derived from a cam 111 on the main cam-shaft 30 through a roller 110 and an arm 109, a lever 112 on the pivot shaft 105 of the arm 109 engaging a stop 113 to limit this movement and being acted upon by a spring 115 to produce the return strokes. The elements 100, 101 are moved towards and away from each other as follows. The element 100 is attached to a nut secured against rotation, the connection being a rod 116 extending along the machine. The nut is carried on a screwed shaft 120 having opposite ratchet-wheels 129, 130 attached. The ratchetwheels 129, 130 are revolved by pawls 131, 132 oscillated by a cam 137 on the shaft 30 through a roller 136 and lever 133, Fig. 8. Fingers 146, 147 are operated through a shaft 149 and bellcrank 150 by a projection 153a carried on one of the machine's " automatic " shafts 72, and these fingers engage one or other of the pawls 131, 132, and cause motion of the shaft 120 in one direction or the other. The means for moving the element 101 is identical and is controlled by a cam 167 on the shaft 30. Operation.-Upon the completion of the leg portion, the roller on the cam controlling normal pressing movement of the needle-bar is shifted to the idle position by a fork 39, the fork 39 being attached to a rod 40 controlled through levers 211, 213, 215 by projections 210a, 210b carried on a lower " automatic " shaft 73. Projections 223a on the shaft 73 also operate, through levers 222, 221, 220, a shaft 219 carrying a fork 218 which shifts the roller 110 into engagement with the cam 111. Rollers are shifted into engagement with the cams 137, 167 by forks 177, 178, the forks being carried on spring-loaded rods 179, 180 which are moved through stops 187, 188 by further spring- loaded rods 191, 192. The rods 191, 192 are operated by projections on the auxiliary pattern chain 95 through connections 197, 198. The elements 100, 101 are shifted outwardly, say, two needles at alternate courses, thread carriers 50, 51 being correspondingly moved, to form the heel cheeks AEB, DCF, Fig. 16. The elements and yarn guides are then moved inwardly at the same or at a different rate to form heel cheeks EGB, CHF. Courses of normal knitting may be interposed between the cheeks AEB, DCF and EGB, CHF. The " automatic " shafts 72, 73 are operated from cams on the shaft 30 by ratchet-wheels and pawls, the operation being controlled by the main pattern chain. Specification 619,490 is referred to.