Patent GB-806737-A (GB)
Title: Capacitor assembly machine
IPC: H01G13/00
Filed: 1956-01-17
Abstract: 806,737. Making condensers; bending; soldering. AEROVOX CORPORATION. Jan. 17, 1956 [Jan. 18, 1955], No. 1607/56. Classes 83 (2) and 83 (4). [Also in Groups XVII and XXX] Apparatus for fixing leads to disc-type condensers or the like comprises means for advancing a strip, means to fix pairs of lead wires to the strip, each lead extending beyond one of the longitudinal edges of the strip, means to insert a condenser between the ends of each pair of leads and means to connect the leads to the disc condenser. Standards such as 21, 22 on a table 23 carry pairs of sprocket wheels over which run two parallel-spaced endless chains 39, 41. Each inner plate 43<SP>1</SP> of each chain has an inwardly extending arm 44, Fig. 19, carrying a depending pin 45, the pins of one chain being staggered relatively to those of the other. As the chains move forwards a sleeve 89 is reciprocated by a compressed air cylinder assembly 83 to wind a wire W around the pins in zig-zag form. Excessive vibration of the chains, which might dislodge the wire, is prevented by spaced guide strips 61, 62 above and below each chain. Paper strips 5, 5<SP>1</SP> are fed around guides 78, 73, Fig. 8, to positions beneath and the wire between the pins 45 and then pass between the presser foot 66 and presser plate 67 of a sewing machine 35 having two spaced needles so that the zig-zag wire is stitched between the strips with the bent ends or loops 111 and 111<SP>1</SP> protruding as seen in Fig. 2. The tape thus formed is moved forwards and also downwardly away from the chains 39, 41 by the lower run of a belt 117 so that the loops are stripped from the pins 45. The loops at one side of the tape are then cut by co-operating cutting wheels 137, 138, Fig. 2, to leave separate leads 145, 146. These cut leads are then bent downwards slightly by a finger 152 which terminates adjacent the leading edge 154 of a separator plate 155, the edge being inclined at approximately the same angle as the forward lead 146 of each pair, Fig. 3. As such forward leads ride off the under edge of the finger 152 they snap upwardly over the edge 154 to the upper side of the plate 155. By the time the other leads 145 are completely free of the finger 152, they have already moved beneath the plate 155. During this separation of the leads, the loops 111<SP>1</SP> on the other side of the tape are pressed against a guide strip by a gravity or spring-pressed roller 158 to prevent slipping of the leads through the tape. The leads 145 and 146 are then bent in a horizontal plane by a driven star-wheel 165 and by a fixed finger 181 respectively so that the leads cross each other in a vertical plane. The next operation is to insert a capacitor disc between each pair of crossed leads, the mechanism for this, Fig. 2, comprising a strip 192 adjacent one edge of the tape and carrying a hopper containing a stack of discs which are pushed out one at a time by a pusher bar operated by a rod 201 from one end of a lever 203 which is rocked by a driven disc 173 having pins 213 engaging a cam 214 on the underside of the other end of the lever. As a pair of leads 145, 146 approaches the end 218 of the separator plate 155, the lead 146 is raised by an inclined strip 216 and a disc 147 is pushed forward from the hopper on to the top of the plate 155. The lead 146 is then allowed to snap back on to the disc which is carried along gripped between the two crossed leads still carried by the tape which next passes beneath a roller 221 at the end of the table 23 and on to a table 23<SP>1</SP>. Here the tape passes around a roller 228, Fig. 16, associated with a heated flux bath 225, a curved guide strip 234 and a roller 229 associated with a heated solder bath 226, the rollers being inclined to the surface of the flux and solder as shown in Fig. 17 so that the portions of the disc having the leads in engagement therewith will be dipped and soldered. The tape carrying the soldered discs then passes to a third table 23<SP>11</SP> where the loops 111<SP>1</SP> are severed by oppositely rotating cutting wheels 249, Fig. 24, and 251 (not shown). Beyond the cutting wheels, the discs successively engage fingers 261 on the top of a rotatable timing disc 262, a single finger beneath the disc being arranged to actuate a switch controlling the operation of a tapesevering mechanism 268, Fig. 26, so that predetermined lengths of tape are cut off, each having a given number of discs corresponding to the number of fingers on the top of the disc 262. Between the disc 262 and the severing mechanism, however, the discs pass a pair of pulling rollers arranged obliquely to the tape so that the discs are moved outwardly from the tape as shown in Fig. 24 and then pass a testing device 335. Specification 806,738, [Group XVII], is referred to. Reference has been directed by the Comptroller to Specification 774,073, [Group XVII].