Patent GB-891378-A (GB)
Title: Riveting machine
IPC: B21J15/32
Filed: 1960-07-25
Abstract: 891,378. Riveting machines. MIAMI RIVET CO. July 25, 1960 [Nov. 27, 1959], No. 25856/60. Class 83 (4). A riveting machine comprises a frame 5, a rivet hopper 21, a rivet setting device 58 and a rivet holder 75, an anvil 13, a rivet feed shoot 24 that communicates with the hopper 21 at its upper end and with its lower end adjacent the rivet holder, rivet-ejecting means 89 actuated by the rivet-setting device and a yieldable coupling between the rivetsetting device and the rivet holder whereby the rivet holder is biased downwardly to dispose a rivet in engagement with a workpiece supported on the anvil, and which permits a further downward movement of the rivet-setting device to force the rivet from the rivet holder and to set it in the workpiece, the return movement of the rivet-setting device biasing the rivet holder to a point adjacent the discharge end of the shoot 24 and the rivet-setting device at its top position actuating the rivet-ejecting means. Feed hopper.-The hopper 21 has a partition 21a and an inclined bottom 23 which feeds rivets to a vertically reciprocating shuttle plate 25. The plate which is driven by a crank-arm 28 carries a group of rivets to the top of a trackway 24. Also mounted on the hopper is a serrated wheel 40 which returns surplus rivets to the hopper. The shuttle plate and the wheel 40 are driven from a common prime mover 38. Feed shoot.-The feed shoot 24 comprises spaced rails 47, the separation of which can be adjusted by screws 48, and a third rail 51 adjustable by screws 52 to clear the rivet heads. At the lower end of the shoot the rivets are forced by a reciprocating bar 89 into a rivetholder 75. The bar 89 is driven forward by a spring 98 acting through a cranked lever 96, and is returned by a spring and plunger 92, 94 when the spring 98 is overcome by the cam action of a slide 58 on a roller 100. Rivet holder.-Rivets ejected from the shoot are received by a holder 75 comprising at its lower end two resilient plates 85 each of which has a block 86 attached to its lower end. The blocks together define a bore 88 to receive the rivet shank and a tapered bore 87 to permit the rivet head to be forced through by the setting device. Rivet-setting device.-A setting punch 60 is mounted on a block 58 which reciprocates in a housing 9 and is controlled by a rocker arm 63, attached to an eccentric 69 driven by a prime mover 72. One face of the block 58 abuts a face of the holder 75 and each face has formed therein a semi-cylindrical groove 76 and 77. Mounted within the grooves are plugs 78 and 78 biased apart by a spring 80, thus providing a yieldable lost-motion coupling between the rivet-setting device and the rivet holder. Operation.-When the prime movers 38 and 72 are set in operation rivets are fed by the shuttle plate 25 to the top of the shoot and fall by gravity to the discharge end. Operation of a pedal 74 engages a one revolution clutch, the eccentric 69 rotates and drives the head 58 downwards carrying with it the rivet holder 75. Movement of the holder is limited by a stop screw 83 which positions the rivet just above a workpiece resting on the anvil. The head 58 continues and the rivet is forced out of the holder and set in the workpiece. During this downward movement of the head the roller 100 is forced backwards against the spring 98 and the bar 89 is rearwards by the spring and plunger 93, 94. As the head 58 returns the roller 100 is released and the lever 96 moves forward under the influence of the spring 98 and feeds another rivet from the shoot into the rivet holder.