GB162132A - Improvements in or relating to file cutting machines - Google Patents

Abstract

162,132. Oxley, G. H., Hirst, A., and Jackson, R. E. Feb. 21. 1020. File-cutting.-In a file-cutting machine having a cutter-head lifted by a cam and a feed-screw operated by ratchet-gear, the pawl of the ratchet gear is carried by one end of a lever, the other end of which engages an operating-cam. The half-nut which engages the feed-screw is operated by an eccentric or an eccentrically-slotted plate, and the hammer-head and presser-bar can be raised by means of a lever. In the form shown, the cutter-head 4 is inclined at 10‹ to the vertical, and the bed 2 at 5‹ to the horizontal. The cuttercarrier 9 is lifted by a cam 8 on a spindle driven through bevel-gearing by a shaft 6. This carries a cam 14, which operates a ratchet-wheel 21 by means of a lever 15, carrying a spring-pressed pawl, and pivoted at 16 in an oil bath 17. The spindle of the ratchet-wheel 21 and the feedscrew 5 carry changeable toothed wheels 23, 24, which are geared together by a changeable toothed wheel 27 adjustable in a slot in a radial arm 25. The latter is rotatable about the feedscrew and can be clamped in position. The halfnut 30, which engages the feed-screw 5, slides in guides in the table 3 and is operated by a slot in a plate 34 turned by a handle 32. A lever 39, which may be operated by a treadle 41, is formed with a boss 43 engaging a projection on the cuttercarrier 9, and is connected to the presser-bar 38 by a slotted link 45. Depression of the treadle 41 first disengages the cutter-carrier from the cam 8 and then lifts the presser-bar 38.