A new or improved machine or device for cutting, or slotting metal particularly suitable for cutting internal or external teeth upon or in connection with wheels

摘要

155,112. McLoughlin, P. Dec. 15, 1919. Gear-cutting; slotting.-A machine for cutting or slotting particularly suitable for cutting gear teeth has the work supported on a table which is horizontally reciprocated for feeding and withdrawing the work to and from the tool, and is provided with automatic indexing-means. The tool ram 1 is reciprocated by a crank-pin 7 engaging a slot in the ram, and the work is carried in a holder on a table 10. The table carries a cross shaft 11 carrying ratchet-wheels 12, 13 and a crank-pin engaging an anchor rod 15. The pawl-lever 18 is oscillated by a pin 19 on the ram and carries pawls 20, 21. The pawl 20 engages the small ratchet teeth on the wheel 12 and gives slow intermittent feed to the table towards the cutting-tool, the pawl 21 meanwhile sliding idly on the smooth part 23 of the small ratchet-wheel. When the table commences the return movement the pawl 21 engages the ratchet-wheel 13 and accelerates the movement of the table while the work is withdrawn and positioned for the next cut. During this withdrawal a rod 31 operates a lever 30, causing a pawl 34 to engage a lever 35 and withdraw the spring-controlled plunger 28 from an index plate 24 which is concentric with the work. A second pawl 32 moves the work into position for the next cut. In a modification, the bed may be hinged to the headstock so that the work may be inclined to the horizontal for cutting bevel-gears or inclined slots.