Patent ES-335813-A1 (ES)
Title: Wire feed and cutoff
IPC: H01R43/28
Filed: 1967-01-19
Abstract: A method of loading with a predetermined length of wire, a pair of spaced-apart wire grippers moved along a given path, in which the wire is fed along a path extending transversely of the given path and through one of the grippers, the leading end of the wire is turned to position it in the other gripper, and the grippers are closed on the wire which is then severed between the one gripper and the wire source so that a loop of wire is held in the grippers with the ends facing in the same direction and transversely of the given path. An apparatus for carrying out the method comprises a base 10 on which are mounted a feeding and measuring unit A, a wire guiding station B, a conveyer C and a shearing unit D. Wire feeding unit.-A pair of feed rollers 12 on shafts 14 are driven by belts 18 from a motor 24. Each of the shafts 14 is mounted at the end of an arm 26 pivoted at 28, linked by a pin-andslot 30 and drawn together by a spring 32. Before reaching the feed rollers the wire passes over and drives a measuring wheel 42. Dark and light segments on the wheel cause photocells 46 to emit pulses which are counted to measure the length of wire passing, the counter stopping the motor 24 when the required length has been fed. The wire passes into a telescopic guide comprising inter-fitting tubes 58 and 60, the tube 58 ends in a collar 174 which has an annular groove 176, Fig. 3. Wire guiding station.-The leading end of the wire is received between clamping jaws 120 by which it is carried round to form a U-shaped loop similar to that shown between the grippers 1681 and 170<1> in Fig. 1. The clamps 120 are formed at the free ends of arms 116, 118, Fig. 3, which are pivoted on a pin 114 between the sides of a channel member 110. The arms are closed by a toggle mechanism (128, 130) actuated from a cam-operated pivoted lever (138, 144), Fig. 2 (not shown). The channel member 110 is mounted on a pinion 102, which meshes with a rack 94, which is slidably mounted in a bracket 92, but is normally held in the position shown in Fig. 3 by the spring 98. The pinion 102 is mounted in bearings in a slide 66 which is movable along guide rods 64. The slide has rack teeth on its underside which are engaged by a toothed segment (74), Fig. 8 (not shown) which is oscillated by a crank arm actuated by a cam (86), Fig. 2 (not shown). Movement of the slide 66 along the rods 64 causes the pinion 102 to rotate, as it rolls on the rack 94, until the member 110 strikes a stop 164. Continued movement of the rack thereafter causes the slide 66 and the rack 94 to move as a unit, so that the clamps 120 are adjacent a wire gripper 170. A further rack-and-pinion mechanism (180, 182, 184), Fig. 7 (not shown), simultaneously causes the wire guide 58 to extend to a point adjacent the wire gripper 168. Conveyer unit.-The ends of the wire loop are held between grippers 168, 170 which are moved in the direction of the arrow X, Fig. 1, to convey the loops to a machine for crimping connectors to the ends. Shearing unit.-A pair of cutter jaws 214 pivoted at 220 are connected by toggle links 210 to an extension 200 of a piston-rod 206 which is moved by unspecified means. The pivot pins 220 are supported in a slide 194 which reciprocates in guides 192, its forward movement being limited by a shoulder 216 engaging a pin 218. The piston-rod extension 200 is slidable in the slide 194 and is biased to a rearward position by two springs 198. When the piston is actuated the extension 200 and the slide 194 move together, due to the stiffness of the springs until the slide is stopped by the pin 218. Further movement of the piston then causes the extension 200 to move relative to the slide and operate the cutters 214 through the toggle links 210.