GB565684A - Improvements in or relating to automatic or semi-automatic lathes and like machine tools - Google Patents

Abstract

565,684. Turning. ARON, E. May 17, 1943, No. 7842. [Class 83 (iii)] In a lathe or other machine tool wherein a saddle is fed by a cam rotatably mounted thereon acting against a fixed abutment, the saddle 12 carries a vertical shaft 18 on which are rotatably mounted cams 16, 17 and a worm-wheel 19, the two cams being connected by serrations 34 and the worm-wheel having dogs 29 engaging a diametrical slot in the cam 17 so that after removal of the shaft 18 the cams may be withdrawn for changing to suit different feeds. The cams engage rollers 23 on levers 21, 22, the former acting through dogs 51 on an arm 55 which feeds the cross slide 13 through a pin 56 and the latter having an arm 24 whose forked end is attached to an abutment pin 50 fixed to the machine frame. Springs 57, 58 return the saddle and cross slide respectively after feeding by the cams. The worm-wheel 19 is driven by a worm 20 mounted in bearings 35 in the saddle and rotated from a shaft 38 travelling with the saddle through a dog clutch 36 operated by a hand lever 41. Alternatively, the clutch may be between the wormwheel and its shaft. A trip lever 44 holds the lever in clutch-engaged position against a spring 43 until a pin on the worm-wheel 19 engages a cam surface thereon to release the clutch and stop the saddle traverse. The shaft 38 slides through a pinion in a change-speed box, or, alternatively, the shaft and worm may' be stationary, the worm-wheel then rolling along the worm as the saddle is traversed.