Patent GB-852328-A (GB)
Title: Improvements in or relating to machines adapted for use in operating upon electricalcomponents
Inventor: AINSWORTH JOHN RICHARD
IPC: H05K13/00
Filed: 1956-07-25
Abstract: 852,328. Straightening electrical leads. BRITISH UNITED, SHOE MACHINERY CO. Ltd. July 24, 1957 [July 25, 1956; July 23, 1957], Nos. 22941/56 and 23234/57. Class 83(4). [Also in Group XVII] The leads of coaxiallead electrical components are straightened by being rolled between relatively - moving cooperating surfaces. A gear 68 mounted on a platform 62, Fig. 1, is continuously driven from a motor 72 by a chain and sprocket and meshes with a gear 67 on a shaft 66 to which are keyed two flanged bushes 74 carrying discs 76, Fig. 4. Each disc has eight evenly - spaced radial slots 78 and mounted between the discs is a wooden spacer. This assembly forms a component - feeding wheel. On each bush 74 is a rotary inner leadstraightening member 82 provided with four arcuate peripheral surfaces 84, Fig. 6, which may be serrated or roughened if desired and which taper from a broad end 86 to a narrow end 85 which extends as a parallel-sided portion 87. Each member 82 is driven at twice the speed of the discs 76 from a gear 67 (or from a similar gear at the other end of the shaft 66) through gears 92, 94 and a gear 96 secured to the member. Concave outer lead - straightening members 106 with surfaces complementary in shape to the surfaces 84 and having narrow parallel-sided insert portions 107, are pivotally mounted on the platform and are urged towards the members 82 by springs 110 but do not quite touch them. In operation, surfaces 84 move past the surfaces of the members 106, the narrow ends meeting just as a slot 78 in the feeding discs 76 lies in the same radial plane so that the leads are subjected to a spinning and straightening action from the component body outwards. If the leads are waxed it is desirable to warm the members 82 and 106. As the leads move between the narrow extensions of the members 82, 106, the components are given an initial spin by engagement with a resilientlymounted arcuate rubber-faced friction-pad 136. Components are fed to the disc assembly 76 by a feed-wheel 150 into the slotted peripheral discs of which the components are placed. The wheel is frictionally driven by a spring belt 152 from the shaft 66 and, if necessary, its rotation is arrested until a slot 78 is positioned to receive the leads of a component, the transfer being assisted by a brush 149. When the components leave the disc assembly 76 they pass by way of a slotted extension 212 into a helical raceway R, described in Specification 850,689, and thence to another feed-wheel assembly comprising inner and outer wheels 174, 172, Fig. 2. These wheels are keyed to a shaft 164 driven through a clutch 166 by a belt 168 from the motor 72 and reduction gearing 70, 71. The wheels are adjusted longitudinally of the shaft by screws 170 and have aligned slots to receive the component leads. The hub portions of the outer wheels 172 have rubber rings 176 on to which rubber-faced presser rolls 178 carried by a pivoted arm 182 are urged by a spring 184. Two spaced-apart adhesive tapes are fed adhesive-side uppermost from reels 192 over guide-rolls 200 and over the rubber rings 176. Two other adhesive tapes are fed from reels 192 over guide rolls 202 and then over the presser rolls 178. The leads of components C are fed by the wheels to the pass between the rings 176 and rolls 178 where they are pressed between the adhesive tapes to form a belt B of components which is wound on to a frictionallydriven take-up reel 204. Reels 192 and 194 are frictionally restrained to prevent slack in the tapes. In order that the components will be taped together at uniformly-spaced intervals, the raceway R serves also as a reservoir. Two light-sensitive cells 214, 216 are provided at the top and bottom of the raceway. When it is filled up to the level of cell 214, clutch 166 is engaged to drive the taping means which is stopped if the column of components falls below the cell 216. In a modification, the feed disc assembly 76, feed-wheel 150 and friction pad 136 are replaced. Components are fed by hand into guides 250, 252, Fig. 8, and pass by way of a raceway 256 to a ledge 258 between fed discs 761 which are formed with slots 78 and cam portions 262 that lift components off the ledge so that they fall into the slots 78. Towards their point of discharge from the straightening- device the components are guided by curved guides 272 towards guide-plates 274, Fig. 9, which lead them down a curved path to a position beneath a shaft 278 where they are supported by the curved upper edges 285 of brackets 284. The shaft 278 carries two pick-up discs 282 with slots 288 which receive the component leads and carry them along the upwardly-curved parts 285 of brackets 284 during which travel the components are supported only near the ends of their leads. If the leads conform to a desired standard of straightness and coaxiality, portions of the leads near the component bodies will pass over pointed end portions 292 of adjacent guides 294 and the components will ride up the guides to be discharged into the raceway R. If, however, the leads do not conform to the required standard, one of the leads at least will not pass over the pointed end 292, but will go below it, causing the component to fall into a shoot 308. This component selecting device may be incorporated into the form of machine described with reference to Figs. 1, 4 and 6, replacing the slotted extension 212. Specification 802,658 is referred to.