Patent GB-1112831-A (GB)
Title: Set screw driver
IPC: B23P19/06
Filed: 1965-05-12
Abstract: 1,112,831. Screwdriving apparatus; indexing table. CHICAGO PNEUMATIC TOOL CO. 12 May, 1965 [29 July, 1964], No. 20011/65. Headings B3B and B3N. An automatic machine for continuously orienting and screwing up screws, comprises a vibratory hopper 58, Fig. 4, a screw selector and delivery unit 60, a screwdriving assembly 42, and a flexible hose 44 extending between the two assemblies. The machine can be positioned on a fixed circular table 56, Fig. 1, along with other machines e.g. a drilling machine, and a tapping machine 52, the workpieces 50 being secured on an indexable table 46 by wbrkholders 48. Selector unit 60 comprises a slide 80, Fig. 8, and a block 82 arranged so that the slide and block can slide horizontally independently, or together, depending on whether a screw is supplied in the oriented or improperly oriented manner. Block 82 has a passage 84 through which the screws pass, when it is aligned with feed tubes 72, 74. Slide 80 has a similar passage 86 which carries a selector disc 88. The slide is moved by a yoke 94 actuated by an air motor 98 and this movement may be transmitted to block 82 by a screw, when supplied in an improperly oriented manner. If the screw is supplied in an oriented manner, slide 80 is moved relative to block 82. In the position of Fig. 14 (not shown), block 82 and slide 80 are moved together until screw 64 is aligned with a passage 100, whereupon an air blast is supplied through a passage 104, Fig. 15 (not shown), and the disoriented screw is blown through passage 100 back to hopper 58. In the position of Fig. 12 (not shown), slide 80 moves relative to block 82 and the oriented screw 64 falls through passage 106 into feed tube 78. Blades 118, 126, 150 and 142, Fig. 8, are operated to provide a controlled supply of screws to a pivotal member 166, Fig. 10. Member 166 has a passage 168 which can be aligned with either tube 78, Fig. 10, or with a tube 44, by a fluid-actuated motor 170. Screwdriving assembly 42, Fig. 19, comprises a base 190, a crosshead 198 slidable on rods 196, by a piston, and an air motor 200 mounted on the crosshead for rotating a screwdriver 202. A pivoting member 226, Fig. 21, similar to member 166 is provided for aligning the screw with tube 44, or with screwdriver 202, and also with collet 260, the latter having two sets of spring- urged balls (262), Figs. 26, 27 (not shown). Cylinder 204 is mounted on a head 274 slidable on guides 278, Fig. 19. Switches Ls 1, 4, 5, 6, 7, Fig. 19, are provided, which switches are actuated by sliding members to control the machine units desired sequence. In operation, screws are supplied from hopper 58 to feed tube 72, Figs. 4, 8, and yoke 94 is moved to the left, Fig. 8. The improperly oriented screws are blown back to the hopper through passage 100, and the properly oriented screws pass to member 166, Fig. 10, their movements being controlled by blades 118, 126, 150, 142, Fig. 8. Member 166 is pivoted and a screw passes into tube 44, whereupon air is supplied at point 188, Fig. 10, and the screw is blown down to member 226, Fig. 21. Motor 200 is started, Figs. 19, 21, fluid is supplied to cylinder 204 and crosshead 198 is moved towards the work. A rod 244, Figs. 19, 21, is actuated, to thus pivot member 226, so that the screw is aligned with screwdriver 202, and further movement of the driver forces the screw through collet 260, and screws it into the work.