GB211248A - Improvements in metal shaping machines - Google Patents

Abstract

211,248. Smith & Coventry, Ltd., and Wright, I. H. Nov. 24, 1922. Shaping curved surfaces.-A shaping machine, specially adapted for cutting curved-sided slots for the reception of a spring band in the peripheries of floating-coupling members, Fig. 10, has a pair of tools disposed in tandem and guided so as to produce simultaneously the oppositely curved faces of each slot. The tools i, Fig. 5, one in advance of the other, are clamped in slides d actuated through connecting-rods 22 by a crankoperated sliding head 21, Fig. 1. The tool slides are mounted in arcuate guides 11, Fig. 3, carried by brackets 12 which, through the medium of cam levers 17, are slightly displaced at the end of each stroke by the wedge end of a rod 13, cam-actuated by the main shaft, in order to lift the tools clear of the work, the cut being restored by springs 18. The tool slides may be adjusted by handwheels 20, operating on toepieces 19. The work e, Fig. 1, is mounted on a spindle a having an indicating worm-wheel w at its lower end, and carried by a slide b which is advanced to the cutters at a slow speed and returned rapidly by a lever f actuated by a cam g mounted on a cross shaft r. The slow feed is obtained from a worm shaft, intermittently rotated by a ratchet-wheel j driven from the mainshaft, the rapid return being effected by shifting a running belt from a loose pulley p to the pulley o, fast on the worm shaft, by means of a striker v actuated through the link u by a cam q on the cross shaft. The work is indexed when a constantly driven friction-wheel 2 is permitted to drive the worm-shaft x', the latter being geared through change-gearing to a wheel which is normally locked by a pawl. On the disengagement of the pawl by a cam-operated rod, the wheel 2 drives the shaft x<1> by means of spring-pressed friction pads y thereby indexing the work through an angle determined by the change-gear train.