Patent GB-847939-A (GB)
Title: Improvements in or relating to machines adapted for use in assembling electrical conductor wires on workpieces
IPC: H05K13/04
Filed: 1957-01-03
Abstract: 847,939. Assembling electrical conductor wires on circuit boards; shearing. BRITISH UNITED SHOE MACHINERY CO. Ltd. Jan. 3, 1957 [Jan. 5, 1956], No. 300/57. Classes 83 (2) and 83 (4). [Also in Group VII] A machine for use in assembling electrical conductor wires upon circuit boards comprises an inside former, outside forming means cooperative with the inside former to bend over end portions of a conductor wire lying across the inside former, an inserting device arranged (a) to provide with the inside former a closed passageway to receive the conductor wire and (b) to thrust legs of the formed wire through holes in the circuit board, and means for feeding the wire endwise through said passageway preparatory to the foiming operations. Conductor wire W from a reel 72 is fed by in steps by co-operating rolls 80, 82, through a tube 84 and nozzle 86 and over an inside former 60 to abut a stop 110. A driver bar 64, in a housing 30 vertically reciprocable, by an air motor 42 through adjustable linkage 50, 54, in a head 24 adjustable about its axis, is formed at its lower end with a groove 170 which may be longitudinally concave and which co-operates with the inside former 60 to guide the wire W. A pivoted cutter 66 is then swung by levers 152, 158, 162 actuated by a cam surface 166 in the housing 30, to co-operate with the end of the nozzle 86 to sever a length of the wire W. An outside former 62 also mounted in the housing 30 then descends to bend the ends of the severed length of wire W over the inside former 60 to form legs. The inside former 60 is then retracted horizontally by a cam surface 204 on the outside former 62 and the driver bar 64 is moved down to insert the legs into holes 70 in a circuit board 68 positioned on supports 300 thereunder. The driver bar 64 and outside former 62 are moved suitably relatively to one another as the housing 30 descends by levers 178, 190, respectively pivoted on the housing 30 and rocked by engagement with fixed cam surfaces. Such movement of the bar 64 and former 62 relative to the housing 30 is effected against the action of springs 172. Anvil elements 212 adjustable about individual vertical axes on a support 263 have previously been raised to support the board 68 by a link 250 and toggle means 254 as the legs of the bent wire are inserted through the holes 70 in the board 68 then engage the upper ends of the elements 212 and are deflected by inclined concave upper surfaces thereof to be clinched over until permanent securing can be effected by soldering. Wire feed. The feed roll 80 is intermittently turned by pawl and ratchet means, the pawl being mounted on a bell-crank 88 rocked by an adjustable link 90 with a bell-crank 92, 94 itself rocked against a spring 104 by a cam surface 102 on the reciprocated housing 30. The bell-crank 92, 94 is latched in a position to which it is moved by the cam 102 by a rod 108 which is unlatched at a suitable point in the cycle, to allow the spring 104 to rotate the feed roll 80, by a lever 122 rocked by a cam surface 129 on the housing 30. Modified anvil means, Figs. 13, 14, 17, 18, comprises a housing 222 moved vertically by a toggle 254 and lever 250 actuated by a solenoid 246. Anvil elements 238 formed at their upper ends with arcuate slots 240 are rotatable through 90 degrees in the housing 222 by rack 236, and pinions, actuated by a pinion 242 turned by a ring-gear 232 oscillated by a lever 266 moved by a solenoid 262. In operation the anvil elements 238 are first raised to support the circuit board 68 and deflect wire legs pushed through holes in the board, Fig. 17. Time delay mechanism then de-energizes the solenoid 246 to lower the elements 238, then energizes the solenoid 262 to turn the elements 238 through 90 degrees, then again energizes the solenoid 246 to raise the elements 238 to cause them to butt and clinch the previously deflected legs, Fig. 18. Unreeling. Wire from a reel 328, Fig. 20, passes over a pulley 304, on a member 318 yieldingly supported on a lever 55 which is rocked about its pivot 52 to reciprocate the housing 30 in the head 24, thence over a spring- mounted pulley 302 to the intermittentlyrotated feed-rolls 80, 82. In operation, the pulley 304 descends to withdraw wire from the reel 328 so that when the pulley 304 later rises the feed-rolls 80, 82 act on slack wire. Specifications 802,658 and 812,170 are referred to.