GB337003A - Improvements in grinding or abrading machines - Google Patents

Abstract

337,003. Triggs, W. W., (Norton Co.). July 19, 1929. Disc apparatus.-A grinding-machine comprises grinding-wheels 18 and 19 mounted on a spindle 13 which is capable of continuous axial reciprocation during grinding or of axial movement to a predetermined position in which it is held during grinding, means being also provided for the automatic withdrawal of the grinding-wheels at the completion of the operation. A worm 30 on the spindle engaging a worm wheel 31 imparts, through a cam 35, reciprocatory movement to a resiliently held follower 36 and an arm 37. Inward movement of a handle 60, Fig. 2, causes clutch teeth 56 to engage the arm 37 with a yoked lever 45, shoes 46 on which enter an annular groove 51 on the spindle and hence impart axial reciprocation thereto. If it is desired to bring the wheel repeatedly to the same position, the clutch is disengaged and a lever 70, Fig. 4, operated to rotate a gear segment 77 and, through a pinion 78, a cam 80, which bears on the yoked arm 45 and brings the grinding-wheel to a definite position, predetermined by adjustable set screws, the same being of such a shape that the wheels are definitely held in position. A cam 105 is adjusted in timed relationship with the feed screw so that reversal of the feed at the end of the cut is adapted to rotate the cam and cause a valve piston 109 to admit compressed air &c. through tubes 115 and 118 into a cylinder 120, Fig. 1, which, through a connecting rod 98, operates the gear segment 77 and releases the wheels axially.