Patent GB-483884-A (GB)
Title: Improvements in or relating to wire-drawing machines
IPC: B21C19/00
Filed: 1937-04-20
Abstract: 483,884. Drawing wire; straightening ; forging bolts ; breaking-pieces for relieving strain. AJAX MANUFACTURING CO. April 20, 1937, No. 11277. Convention date, May 21, 1936. [Class 83 (iv)] [Also in Group XXIV] A wire-drawing machine has an inching mechanism for starting the stock through the die comprising grippers which operate intermittently to advance the stock. A gripping device between the die and feeding device grips the stock intermittently to prevent backward movement. The inching mechanism is provided in a machine of the reciprocating-die type. A die carrier 25 is slidable in a guideway 24 and is engaged for reciprocation by the head of a lever 46 which is actuated from a further machine for treating the wire, such as a bolt header, through a rod 16 of adjustable stroke. The machines may be combined as described in U.S.A. Specification 1,934,466. Rods 52 connected to the die slide produce reciprocation of a straightening device comprising a conical die 63 and rolls 64. Springs 56 between sleeves 53 and the die carrier are normally compressed by stops 54 and are further compressed during working by stops 105 to tend to return the die, the stops being removed during inching to render the springs inoperative. A gripping device 22, which is described in Specification 457,233, comprises a pair of tapered grippers 58, sliding on rollers 59, which grip the stock during the working movement of the die, but permit rolls 15 to feed the stock while the die floats with it under the action of the springs 56. The grippers may be released manually by a lever 61. A stock feeder 20 and gripper 20A are of identical construction and comprise pivoted fingers 69, 70 with tapering gripping grooves 73, and having intermeshing teeth 74. They may be manually disengaged by a lever 75, but are normally urged to gripping position by a spring-pressed plunger 79. A locking bolt 83 holds the jaws apart during normal working. The slide 67 is reciprocated by a link 88 engaging adjustably the lever 46. A rack 95 and clamp 96, 97 holds the slide 68 in adjusted position. The link 88 is raised to disengaged position during normal working by the head 101 of a pivoted latch operated by a lever 99, the same latch operating a rocker 108, 106 to move the stops 105 which are disengaged during inching, when the die slide performs only a short stroke. When the stock is sufficiently advanced, the die slide 25 is advanced manually by a hand lever 115 to insert the stock between the rolls 15. A pin 117 connecting the rod 16 and lever 46 is adapted to shear under excess load, the part 120 of the rod being extended so that it drops on to a stirrup 121. In a modification, a bolt 125, Fig. 7, breaks and allows the portion 123 of the lever to pivot about a bushing 124 without actuating the lever 46. Die-holders ; lubricating.-The die 29, Fig. 5, is retained by a set screw 30 in a holder comprising a chamber 31 for a drawing compound. A cover with a bushing 36 is clamped by a bayonet plate 37. The filling aperture is closed by a cover 41 retained by a bail type latch 42. A bushing 39 beyond the die is secured by a screw 40.