Patent GB-1171835-A (GB)
Title: Machine for Feeding Transverse Wires to a Mesh Welding Machine.
IPC: B21F23/00
Filed: 1967-02-23
Abstract: 1,171,835. Welding by pressure. EVG ENTWICKLUNGS - U. VERWERTUNGS G.m.b.H. 23 Feb., 1967 [9 March, 1966], No. 8749/67. Heading B3R. A machine for feeding transverse wire into a mesh welding machine comprises a main shaft 13 carrying a wheel 11 for advancing the transverse wire and a mechanism for rotating the shaft 13 intermittently in one direction so that the required length is advanced in each cycle, the mechanism including two bevel wheels 10, 10<SP>1</SP> rotatably mounted on the shaft 13, a driving means 9 for rotating the bevel wheels in opposite directions, a sleeve 15 axially movable on but rotatable with the shaft 13 and arranged to be connected alternately to the bevel wheels by a pair of switching rings, one connected between each bevel wheel and the sleeve and each having adjacent the sleeve a set of finely spaced teeth engageable with a similar set of teeth on the sleeve and having adjacent the respective bevel wheel a permanent coupling with the bevel wheel which permits some rotational play before the sleeve is fully engaged with the switching ring, the arrangement being such that when the bevel wheels start to rotate after their directions of rotation have changed, the sleeve is forced out of engagement with one switching ring and into engagement with the other. A driving wheel 1 driven at a speed dependent on the advancing stroke of the longitudinal wires being fed to a resistance welding machine carries a radial guide 2 in which a slide 4 supporting a crank-pin 35 adjustably arranged. The crankpin 3 is connected to one end of a connecting rod 5 having a rack 5a at its other end engaging a pinion 8 mounted in the frame to rotate the pinion alternately in opposite directions. The pinion 8 is connected to a large bevel wheel 9 engaging the two small bevel wheels 10, 10<SP>1</SP> rotatably mounted on the shaft 13 and the bevel wheels 10, 10<SP>1</SP> engage switching rings 14, 14<SP>1</SP> through claw couplings 16, 16<SP>1</SP> which permit some rotation and axial movement of the rings 14, 14<SP>1</SP> relative to the bevel wheels 10, 10<SP>1</SP>, the couplings being spring urged apart. Fine teeth on the other faces of the rings 14, 14<SP>1</SP> are engageable with fine teeth on the sleeve 15 axially slidable on but rotatable with the shaft 13 and carrying an annular control blade 21. A roller blade 22 mounted on a lever 20 is, by means of a cam follower 20b engaging cams 19a, 19b on the periphery of the wheel 1, caused to engage the blade 21 to lock the sleeve 15 in position. The teeth on the coupling sleeve 15 are shown fully engaged with the teeth on the switching ring 14<SP>1</SP> in Fig. 2 and the ring 14<SP>1</SP> fully engaged with the bevel wheel 10<SP>1</SP> while the sleeve is disengaged from the wheel 14 and the wheel 14 in its minimum position of engagement with the wheel 10. When the direction of rotation of the pinion 8 and bevel wheel 9 changes the sleeve 15 is caused by the engagement of the ring 14<SP>1</SP> and coupling 16<SP>1</SP> to slide axially to the right in Fig. 2 to engage with the ring 14 and the ring 14 is caused to move relatively to bevel wheel 10 to come into full engagement therewith. A pinion 17 on the shaft 13 engages a pinion 17<SP>1</SP>, Fig. 1, on a shaft 18 carrying a wheel 11<SP>1</SP>, the wheels 11 and 11<SP>1</SP> feeding the transverse wire between them. The claw coupling between the switching rings and bevel wheels may be replaced by a steep, non-selflocking thread.