Patent GB-984582-A (GB)
Title: Apparatus for yarn severing in circular knitting machines
IPC: D04B35/00
Filed: 1961-07-11
Abstract: 984, 582. Knitting machines. SINGER CO. July 11, 1961 [July 12, 1960], No. 25036/61. Heading D1C.  A circular knitting machine having a cutter for yarn inserted and withdrawn at a feed station has guide means to direct the withdrawn yarn from the feed station to the cutter, below a suction tube therebetween, has elevator means 57 underlying the yarn to elevate it above the surface of the dial cap and reduce the drag thereon to permit the suction tube to maintain correct tension on the yarn at the feed station. A multifeed circular knitting machine comprises a rotary cylinder mounting a circle of needles 15, a toothed ring 23 mounted for rotation with the cylinder, a stationary dial cap 31 and at least feed stations having feed fingers operable between active and inactive positions to respectively introduce yarn into and withdraw yarn from the needle circle, and cams to actuate the needles to the stitch draw position, a yarn cutter 29 for yarn inserted and withdrawn from one feed station 34, the cutter comprising a cutter blade 51 mounted on the dial cap and co-operating with the ring to sever the yarn, the cutter being positioned beyond a subsequent feed station 33 to sever the yarns inserted and withdrawn following actuation of the needles at the subsequent feed station 33. The yarn Y-1 withdrawn from action by feed finger 36-2 at station 33 is carried round by the needle circle to be cut by the blade 46 of a cutter 28, the severed end being disposed under the wire 48 and below the suction tube 39, the latter then drawing up the severed end to lie adjacent the end of the other inactive yarns Y2 extending from the other inactive feed fingers 36. A yarn Y-3 inserted by feed finger 36-1 prior to the withdrawal of yarn Y-1 is also carried round by the needles, the unknit end finally extending from the cutter blade 46 to the suction tube 39 which withdraws the severed end then cut by the blade. At feed station 34 a yarn Y-5 is inserted by feed finger 38-3 and a yarn Y-4 withdrawn by feed finger 38-2. The last group of needles, 15-4, to receive the yarn Y-4 are not drawn down at feed station 34 and receive the yarn Y-3 at station 33. At this latter station the stitch cam lowers the needles and the latches are closed to entrap the yarn Y-4 which is then severed by the blade 52 of cutter 29. At this point the yarn Y-4 extends from its finger 36-2 under wire 56, over elevator wire 57, around pins 58-63 to pass below a suction tube 40 which draws in the severed end to lie adjacent the end of an unselected yarn Y-6. A similar action occurs when the free end of the newly inserted yarn Y-5 moves round with the needle ring and is cut by blade 52, the severed end being removed by the tube 40. The feeding stations are stated to be controlled by conventional pattern mechanism, (not shown) including a pattern drum and pattern chain. In a second embodiment, Fig. 10, the cutter 28 is replaced by a cutter 128 pivoted at 134 to the dial cap. The blade 130 is pivoted to the cutter assembly and biased against the toothed ring. A member 138 connected to the blade is actuable by the pattern mechanism to elevate the blade to allow yarns inserted at 34 to pass the cutter without severance. Members similar to member 138 may be provided to disengage the blades 44 and 51 when there is no insertion or withdrawal of yarns at the respective feed stations. Specifications 912,855 and 984,583 are referred to.