GB572064A - Improvements relating to grinding and like machines - Google Patents

Abstract

572,064. Grinding-machines. MARX, E. Feb. 21, 1944, No. 3196. [Class 60] In a grinding-machine in which combined rotary and reciprocating motion is imparted by a power drive to the tool spindle, a clutch is provided to allow of disconnection of the reciprocating drive without disconnecting the rotary drive, and means is provided by which the spindle can be reciprocated by hand. The spindle 3, Fig. 2, having thereon a socket 4 for a honing-tool, is splined in a sleeve 5 rotated, through belt and worm gearing by an electric motor 10 mounted on the frame 1. The spindle 3 is also reciprocated axially by the motor 10 through gearing 18 ... 23, the gear 23 being fixed on a shaft 24 carrying a crank disc 25 having therein a diametral slot in which is adjustably secured a pivot pin 27 ; the pin engages one end of a connecting-rod 28, adjustable in length, and engaging a crank 30 which carries one part of a spring clutch, the other part of which effects the operation of a gear segment 42 meshing with a toothed wheel 43 on a shaft 44, which also carries a pinion 45 engaging a rack formed on a sleeve 47 slidable in a bearing 48 on the frame 1 and adapted to move the spindle 3 axially by means of ball bearings 49, 50. When the clutch is disengaged by turning a knob 38, the power reciprocation ceases, and the sleeve may be reciprocated by hand through a clutch on the end of the shaft 44; the clutch is engaged by pressure on the operating arms against a spring. The machine may be reset to the position obtaining before disconnection of the power drive by hand operation of the clutch members in the power train.