Patent GB-1246697-A (GB)
Title: Improvements relating to apparatus for feeding a wire longitudinally
IPC: B21D43/00
Filed: 1969-01-30
Abstract: 1,246,697. Wire feed; making strapping elements; bending cutters; embossing. INTERNATIONAL BUSINESS MACHINES CORP. 30 Jan., 1969 [2 Feb., 1968], No. 5521/69. Headings B3A, B3E, B3Q and B3W. Apparatus for feeding a wire longitudinally a controlled amount comprises a first clutch 108, July 8, engageable at any position of rotation to drive the wire in a longitudinal direction, rollers 116 and 118 for engaging the wire, a shaft 112 for operatively connecting the drive clutch and the rollers and having substantially no free play, a second clutch 109 engageable at any position of rotation and mounted in reverse relationship to the first clutch 108 for locking the roller 116 and 118 against reverse rotation, and gears 110 and 111 for operatively connecting the second clutch and the first clutch and having essentially no free play. In the production of miniaturized hybrid circuit modules, L-shaped bridging elements 41 and 42 are formed by driving a feed bar 104 upwards by feed cam 64 which causes clutch 108 to lock on shaft 112 causing the shaft to rotate clockwise as in Fig. 8. Spring 117 is attached between the clutch 108 and feed mounting 105 so as to urge lever 106 against feed bar 104. As feed bar 104 drops, lever 106 rotates counterclockwise thereby rotating clutch 108 in the same direction which freewheels on shaft 112. To lock shaft 112 against reverse rotation clutch 109 is mounted in reverse relationship to clutch 108. On the feed stroke clutch 109 freewheels but as feed bar 104 drops, it locks on shaft 113 so that counterclockwise rotation on shaft 112 is prevented via the gears 110 and 111. Wire is fed from spools through wire feed rolls 116 and 118, and 114 and 119 respectively and through duct 164 so as to abutt against stop 168. Vacuum probe 152 having vacuum passages 153 slides within forming tool 154. After the bridging element has been formed by the forming tool 154, anvil 166 is pushed by a push pin on shaft 151 out of the path of the vacuum probe 152 so that the vacuum probe can carry the strips down to the substrate 48. A dimpler mechanism which provides a socket in the straps is provided which is actuated by cam 63 which-causes, via rocker arm 96, tool arm 81 to reciprocate in a vertical motion. This movement of tool arm 81 cooperating with the groove in dimpler pivot arm 126 causes the latter to pivot about pin 128, which urges dimpler arm 140 clockwise thus dimpling the strip with punch 142. Fig. 1 shows an automated device assembly apparatus which comprises a tape loader 5 which loads substrate 35 on to tapes 1, a dimpler 6 which dimples a flat area on each of the pads of the substrate which will subsequently receive the terminals of clips or the ends of the L-shaped strapping elements, a flux dispenser 9 wherein droplets of flux are discharged on to the substrate area in the approximate locations preparatory to affixing the chips or strip elements to the substrate 48, a flux flattener to flatten and spread the droplets of flux, a rotary semi-conductor slip placement head 17, the strip forming and position apparatus 30 as described above, a sensor 22 for determining if the required number of clips and bridging elements have been positioned thereon and finally an inboard station 23.