Patent GB-954727-A (GB)
Title: An installation for deforming wires and the like
IPC: B21C1/30
Filed: 1962-06-21
Abstract: 954,727. Drawing Wire. F. K. KOCH, [trading as PELTZER & EHLERS]. June 21, 1962 [July 27, 1961], No. 23915/62. Heading B3P. In a wire-working installation which comprises ram tongs, a drawing mechanism having a draw die and drawing tongs which move relative to the die, a wireworking machine making alternate working and idle strokes, and a feed device for the wire-working machine, the draw die and drawing tongs are also arranged to move as a unit in the direction of the wire feed on a guide the length of which is a multiple of the length of wire fed on each stroke of the wire-working machine. The draw die 9 carries on either side a double-acting hydraulic cylinder 11 the piston rods 13 of which are connected by a member wherein are mounted wedge-type drawing tongs 18. The cylinders 11 are actuated by a control cylinder 15 which is driven by a motor 17 through a transmission gearing 16. The assembly of draw die and tongs is free to slide in a guide 20 secured to a frame 6, but can be locked in a rearward position in which the holes 40 and 41 coincide. The ram tongs 7 comprise a wedge-type gripper 42 free to move in the direction of the wire feed and drawn rearwards by springs 35 against adjustable stops 36. Free to slide in the body of the ram tongs are two rods 37 which have stops 38 at their rear ends and at their forward ends have couplings 39 which engage with couplings 14a on the piston rods 14 of the cylinders 11. Mounted on the frame 6 are three contacts 22, 23 and 24 and on the draw die 9 is a contact arm 21. A roll feed device 4 feeds wire to the wire-working machine 5. Operation.-The draw die 9 is locked in the rearward position and the couplings 39 and 14a engaged. Wire 2 from a reel 1 is inserted in the gripper 42 and the control cylinder 15 is actuated so that during the latter part of the stroke of the cylinders 11 the stops 38 engage the ram tongs 7 and push the wire through a guide 43 towards the die 9. Successive strokes of the cylinders result in the wire being forced through the die until it can be gripped by the drawing tongs 18. The gripper 42 is then released, and the wire is drawn through the die 9 until its leading end reaches the feed device 4. The assembly of draw die and tongs is unlocked, the couplings 39 and 14a are disengaged and the electrical contacts 22, 23 and 24 are made operative. The wire 2 is then drawn continuously by relative movement of the tongs 18 and the die 9, and the drawn wire is taken up by the roll feed device 4. If the rate of drawing exceeds the requirements of the press 5 then the drawing mechanism moves rearwards until the arm 21 engages the contact 22 and disengages the drive to the control cylinder 15. As the drawn wire is taken up by the feed device the drawing mechanism is pulled forward until the arm 21 engages the contact 23 and re-starts the control cylinder 15. If the drawing mechanism fails to produce sufficient wire the arm 21 engages the contact 24 and stops the press 5. The swept volume of the control cylinder 15 is greater than that of the cylinders 11 so that excess fluid is by-passed through the valves 31.