Patent GB-314625-A (GB)
Title: Wire spring making machine
IPC: B21F3/06
Filed: 1928-04-23
Abstract: 314,625. Ziler, C. H. April 23, 1928. Angular bending; dies; coiling; twisting wires together; shearing- adjuncts.-In a machine for coiling springs and knotting one or both end coils thereof, the spring after coiling, is transferred from the coiling mechanism to a reciprocating knotter mechanism which is operated to form the knot during its reciprocation. The wire is fed by rolls 2 through guide rolls 4 and against a roll in a pivoted arm 6 which is rocked by a cam 11 and levers 10, 8 and adjustable tappet 9 to vary the diameter of the coil. The pitch of the coil is determined by a block 95 on which is placed an arm 96 having a finger 97 so that the coils are set by pressure against the arm after leaving the pitch block. The wire is cut after the coil is received in the knotter mechanism by a reciprocating cutter 26, Fig. 13, engaging the part 27 of the arm 6. When only one end is knotted the other end is offset at 28 by a former 29 on the cutter engaging a former 30 on the arm 6. The stock is slightly retracted after the coil is cut off, by a gripper 18, 19, Fig. 11, carried by a lever 14 which is normally pressed forward by a spring 16 but is retracted by a cam 24 and lever 23. The jaw 19 which is pressed by a spring 21 is disengaged in its forward position by a stop 22, but is moved by the spring 21 to grip the wire in its backward motion. The knotter mechanism comprises a slotted-pinionslide 38, a cam bar 62 and a carriage 40, reciprocating in guides and having limited motion with respect to each other. The pinion in the slide engages a fixed rack 42 so as to rotate it during reciprocation to knot the end coil. The, carriage 40 has a pair of transverse clamps 46, 47, Fig. 8, which are pressed apart by a spring 55 but are closed by a cam 52 on the cam member 62 to grip the two end coils 50, 51. An adjustable hardened block 58 may coact with the cam to take up wear. The slide and carriage are reciprocated by a connecting-rod attached at one end to the cam bar and at the other to a crank on a shaft 34 driven by sprocket gear from the main shaft. The slide and carriage reciprocate towards the coiling mechanism with the jaws 46, 47 open. The slide 38, which carries a pivoted dog 63 normally locked in a notch in the cam bar, is first stopped by a fixed cam 65, Fig. 10, which disengages the dog and brings it into contact with a shoulder 66 on the frame. The dog is re-engaged during the return movement of the carriage 40 by a spring pressed plunger 67. After stoppage of the slide, the cam bar and carriage continue to move, the carriage finally engaging a stop, whereupon the cam moves in the carriage to close the jaws 46, 47. A spring- pressed pivoted dog 69 in the carriage is thus raised to lock the cam to the carriage. On the return of the carriage the spring is brought into the slot in the pinion and the pinion slide is then moved back with the carriage, the pinion knotting the end coil. The pinion then engages a plain portion of the rack, one of its teeth being shortened to engage the bar to keep the slot in position for disengagement of the spring. When the dog 69 engages an end stop it is released and the cam bar withdrawn to open the jaws 46, 47. The spring is withdrawn from the pinion by a pair of spring pressed jaws 73 pivoted at 74 in a rock shaft 75, the jaws being held open for insertion of the spring by a fixed cam 84. The rock shaft has a pinion 78 engaging a rack 79 driven forward against the action of a spring 83 by a cam 81 on a chain driven shaft 80 engaging a pin 82 on the rack. The jaws are swung downwards to place the spring in a nesting guide 85, the jaws being opened by a fixed cam 86. The end of the spring engages the front of a curved plate 87 to prevent it being lifted during return of the jaws 73. For knotting both ends of a spring, a duplicate knotting mechanism arranged on a parallel guide is used, the wrist pin connecting the cam bars to the connecting rod having pinions at each end engaging equalizing racks. Specification 314,744 is referred to.