GB361288A - Improvements relating to punching, drilling, reamering and like machines - Google Patents

Abstract

361,288. Punching and drilling machines. SEDGWICK, C. H. and SEDGWICK, E. B., 36, West Ferry Road, Millwall, London. Aug. 15, 1930, No. 24507. [Classes 83 (iii) and 83 (iv).] Spacing racks and like bars.-A tool head 4 carrying a punch 13 and die 14, or a drill, slides on fixed guides 2, 3 and is traversed step-by-step through the agency of a rack 20 reciprocated by the joint action of a face cam 24 and a continuously driven pinion 19. The gearing in the head 4 is driven from a pinion 5, Fig. 2, sliding with the head on a shaped shaft 6 constantly driven from forward and reverse driving pulleys 7, 8. This gearing comprises the pinion 19, Fig. 5, meshing with the rack 20, so that as the latter moves to the left in Fig. 1, the head 4 remains stationary owing to friction and as the rack moves to the right the head 4 is advanced thus providing a movement in steps with definite dwells for the punching &c. operations. The extent of each step depends on the ratio of a gear pair 16, 17 which may be changed or replaced by variable gearing. The cam 24, which is constantly driven from shaft 6 through a pair 26, 25, Fig. 2, actuates the rack 20 through a sector lever 21, Fig. 1. The work is supported with its edge on aT-bar 30, Fig. 5, and held by clamps 31, Fig. 1, or it may be adjustable by grippers movable by screws. To throw the punch out of action as required to leave gaps in a row of holes, a templet 36, Fig. 5, may be provided. This lifts a lever 33 on the tool head 4 which withdraws a packing-piece 32, or breaks a toggle, and so prevents the punch making a hole. The templet 36 may consist of a plank on edge with a series of holes 36<1>, Fig. 2, into which mushroom-head studs 35 are set wherever a hole is not to be punched. A pusher 42 coacts with tappets 43, 44 to rock a shaft 41 and so operate reversing belt-shifter 47.