Patent GB-783934-A (GB)
Title: Improvements in or relating to wire shaping machine
Inventor: JR EDWARD L BRONSTIEN
IPC: B21F1/00
Filed: 1955-10-03
Abstract: 783,934. Making wire articles; feeding wire. UNITED STATES BEDDING CO. Oct. 3, 1955, No. 28081/55. Class 83 (4). A wire shaping machine comprises a mandrel or guide about which wire is formed into a loop, a rotatable looping member mounted within the guide and projecting radially therefrom, means for moving the member longitudinally to permit it to pass over the wire and engage the other side and means for rotating the member to form a loop in the wire. The invention is described as applied to a machine for forming stabilizers for bed springs as shown in Fig. 30. A length of wire 13 sufficient for forming one stabilizer is fed into the machine by a pair of feed rolls 14, 15, driven by a rack 24, Fig. 9, reciprocated by a pair of compressed-air cylinder and piston assemblies 19, 22 and 21, 23 and engaging the driving gears 25a, 26a of roller clutches 25, 26 on the shafts of the feed rolls. The arrangement is such that as the rack moves in one direction, one of the rolls is rotated to feed half the length of wire and on the return stroke the other roll feeds the remainder of the length. Air is then fed to a cylinder 28 to actuate a cutter 27 to sever the length. The wire is then resting on guides as shown in Fig. 2 between a fixed die 38 and a reciprocating die 42. The fixed die is of general rectangular shape with slightly concave upper and lower faces and is adjustably bolted to a front supporting plate 32. The lower die 42 is mounted on a block 46 reciprocable in guides 47, Fig. 6, and having a projection 45 riding in a slot 48 in the plate 32. A cylinder and piston assembly 52 serves to move the die 42 up to and away from the die 38. Above the fixed die 38 is another pneumatically reciprocable die 53 having a downwardly extending finger 54 at one corner. At each side of the die 38 is a looping device comprising a mandrel or guide 63 within which is pivoted between its ends, a coiling dog 62. The member 63 is bolted to a gear 75 which together with the similar gear of the other looping device is rotated by a pneumatically operated rack 78. As the guide 63 rotates it carries the dog around with it and the lip of the dog is gradually raised by a cam surface formed on a plate 72 so that it passes over the wire to be looped and is then lowered behind it. The free end of the dog 62 may be raised to release a shaped wire from beneath it by a plunger 66 normally held by a spring in the position shown in Fig. 6. Around the die 38 are two pairs of stripper plates 84, 85 which may be acutated by plungers 88, 89 engaged by levers 98, 99 which can be rocked by a bar 95 secured to the piston of a compressed-air cylinder 104. The bar 95 also actuates the plungers 66 to release the wire from the dog 62. The supply of compressed air to the various cylinders is controlled by a cam so that the parts of the machine operate in sequence. After the feeding in and severing of a length of wire, the die 42 moves up to the fixed die and the looping devices rotate to form a double loop at each side of the die as shown in Fig. 4, the sides of the partially shaped object being held within clips 83 attached to the stripper plates. The upper die 53 then moves down to complete the shaping of the wire, which is ejected. The stabilizer is completed by welding together the adjoining ends of the wire.