Patent GB-851896-A (GB)
Title: Improvements in and relating to fabricating machines
IPC: H05K13/04
Filed: 1957-01-16
Abstract: 851,896. Assembling electronic components. PHILCO CORPORATION. Jan. 16, 1957 [Jan. 16, 1956], No. 1674/57. Class 83 (2). [Also in Group XXIV] Apparatus for assembling elements such as electronic components Q on articles such as circuit panels P, Fig. 1, comprises a conveyer device 31 for moving the article past a plurality of fabricating heads 29, 30 and supervising means for checking the fabricating operations. Printed circuit panels P are supplied from a mechanized or manual supply station 21; they may be bare or have some components already attached. The panels pass on to an intermittently-moving chain conveyer 31 which has panel engagement members 30p, Fig. 5, for moving the panels stepwise past componentinserting heads 29, 30. The heads are driven by a common electric motor 100 through an adjustable speed-drive 101 and a longitudinal shaft 103 connected through chain transmission 104, which permits universal adjustment of each head, to the main clutch 50 thereof. The heads are adjustable at their respective stations by a handle 188, Fig. 6, which effects longitudinal movement along base 179 indicated by. a dial 193, a handle 191 which effects transverse movement indicated by a dial 194, and a handle 192 which effects rotary movement indicated by a dial 195. Each head comprises an upper ram 109 carrying an inserting-tool T and a lower ram 110 carrying an anvil R, both rams being driven simultaneously from the clutch 50 by cams 107, 108, Fig. 5, and pivoted spring-loaded levers 221, 227, Fig. 7 (not shown). The strokes of the upper and lower rams are adjustable independently by knobs 232, 234, Fig. 7 (not shown). Components are fed from a container 207 to the tool T by a belt conveyer 208, bucket 209 vibrated by a vibrator 210, and shoot 211. An electric eye 213 detects any depletion in the component supply. The conveyer 31, Fig. 5, is moved intermittently by a roller 113 driven from the motor 100 and having a helical groove 130 engageable by one of a number of spring- biased pins 129 connected to a chain 138 coupled to the chain 143 of the conveyer 131. Further gearing 115 drives a cam 116 actuating a spring-biased longitudinal rod 64 and programme control clutch 68 which, when engaged, drives cams 120, 121 and spring-biased longitudinal rods 63, 62 and a cam 122 which controls the engagement of the pin 129 for moving the conveyer. The rods 62, 63, 64 control mechanism for supervising both the transfer of the panels and the insertion of the components. In operation, when a panel P arrives at an inserting head 30, it engages and moves a pivoted lever 163 causing alignment of holes 167, 168 and thus permits a bell-crank lever 152, actuated by a collar 154 on a spring-biased cable 155, to pass a rod 159 through the aligned holes 167, 168. This movement of the cable 155 causes engagement of the head clutch 50, Figs. 8, 9 (not shown). If, however, no panel arrives at any particular head, the rod 159 cannot be moved and this prevents movement of the cable 155 and engagement of the particular head clutch; the other heads meanwhile continue to operate. If a component fails to be inserted properly in its panel or if the component supply at any head is depleted, as detected by the electric eye 213 or other detection means, a second cable 171 is prevented by mechanism 170, 269, 277, Fig. 8 (not shown), from being lowered and this prevents movement to the right of rod 64 by spring 64s. Programme clutch 68 is thus not engaged and hence pin 129 remains disengaged from helical groove 130 and the transfer of panels is interrupted. The operating head which caused the stoppage continues to operate so as to attempt to renew the supply of components but the other heads are stopped. A starting switch 328, Fig. 1, speed adjusters 326 and speed indicators 327 are fitted. A manually-operated control-handle 333, Fig. 8 (not shown) on each head is used to select automatic, single-cycle, continuous cycles or stopping of the head. The heads may be used to perforate the panels or to test inserted components.