Patent GB-1045518-A (GB)
Title: Apparatus for operating upon workpiece means
IPC: H05K13/04
Filed: 1965-08-13
Abstract: 1,045,518. Shearing; angular bending. AMP. Inc. Aug. 13, 1965 [Aug. 24, 1964; June 9, 1965], No. 34806/65. Headings B3E and B3W. An apparatus in which a power shaft is arranged to drive in reciprocating motion a plurality of tools comprises a plurality of actuator levers 60, 62, 64, 66, pivotally mounted on a jack shaft 58 which extends parallel to a power shaft 48 on which are mounted a corresponding number of cams 102, 110, 114 and 126, a plurality of rods 88, 90 coupled to the tools 38, 40 and mounted for swinging movement and connecting levers 100, 108 acting between the rods and the actuator levers, so that as the cams 102 and 110 oscillate the actuator levers 64, 68 respectively, the rods 88, 90 move to reciprocate the tools. The connecting lever 100 acts on the rod 88 through a toggle linkage 92, 94 and a similar toggle linkage 104, 106 connects the rod 90 and the connecting lever 108. The rods 88, 90 are freely pivoted on the shaft 48. The apparatus is described with reference to assembling a socket connector 2, Figs. 1 and 2 (not shown), to a printed circuit board 18 and comprises tools for shearing the connector 2 from carrier strips 12 and 14, inserting the connector into the board, bending the legs 8 and 10 against the lower face of the board and feeding the carrier strips forward to bring another connector to the shearing station. Shearing.-The shearing tool is connected to a rod 118 which is pivotally attached at 116 to a rod 112 which is connected to the lever 66 so that as the lever 66 is rotated anti-clockwise the rod 118 moves to the left and shears the connector from the strips 12 and 14 by cooperating with an aperture 91 in a tube 40 which has previously been lowered by movement of the rod 90. In its lowered position the tube 40 also clamps the circuit-board 18. Inserting connector in circuit-board.-The plunger 38 is lowered by the rod 90 and passes through the tube 40 to push the legs 8,10 of the connector through the board 18. Bending.-The bending tools are operated by a rod 120 which is pivotally attached to a lever 122 which is fulcrummed on the shaft 58 and is connected at its upper end to the lever 62, so that as the lever 62 is rotated anticlockwise by the cam 126 the rod 120 moves to the right. The left-hand end of the rod 120 is bifurcated and is connected by a pin 168, Figs. 11-15 (not shown), to toggle links 170, 172 which are connected to pins 154, 162. Also mounted on the pin 154 are a pair of arms 150, 152 which have bending fingers 44 at their upper ends and opposed cam surfaces 160 which are engaged by the pin 162. Each of the pins 154, 162 passes through over-size openings in a pair of supporting side plates 156, 158 and the pin 162 is biased towards the pin 154 by springs 164 anchored to pins 166 fixed in the plates 156 and 158. During the inserting operation the fingers 44 project through the board 18 to guide the connector. As the rod 120 moves to the right the pin 154 moves downwards and the fingers are withdrawn from the board. Further movement of the rod causes the pin 162 to move downwardly against the springs 164, and the pin 154 acts on the cam surfaces 160 to move the fingers 44 apart and bend the legs 8, 10 against the board 18. Feeding mechanism.-The feeding mechanism is driven by a rod 84 pivotally connected to the lever 60. A link 128, Figs. 6 to 8 (not shown), is connected to the rod 84 and to a fixed block 134 and a further link 130 is connected to the rod 84 and to a pin 140 which extends through a slot in the block 134. A feed pawl is also mounted on the pin 140 and is biased in an anti-clockwise sense by a spring 142. As the rod 84 moves to the left the pawl 138 engages the strip of connectors to move them to the right (as seen in Fig. 6) between guide plates 135 and through a recess 136 in the block 134. The complete machine is controlled by a pedal-operated one-revolution clutch and the return movement of the levers 60, 62, 64, 66 is effected by springs. In a modification to the linkage for moving the rods 88 and 90, which increases the thrust available at the beginning and end of the stroke, Figs. 16 and 17 (not shown), the rod 178, which corresponds to either of the rods 88 or 90 is driven by a lever 176 which comprises spaced-apart parallel plates pivotally mounted to the jack shaft 58. A link 184 is attached to the lever 176 by a pin-and-slot connection 186, 188 and to the rod 178 by toggle links 190, 192. A second link 196 is attached to the lever 176 by a pin-and-slot connection 198, 200 and to the rod 178 by toggle links 202, 206 so that when the lever 176 is rotated anti-clockwise by the cam 182 the link 196 acts on the rod through the toggle links 202, 206 which are initially almost straight so that a considerable force is applied to the rod 178. During this movement the toggle links 190, 192 are partially straightened and as the movement of the lever continues the pin 186 engages the left-hand end of the slot 188 and applies thrust to the rod 178.