GB631947A - Improvements in and relating to mechanisms for limiting the feed motion in a lathe or other machine tool - Google Patents

Abstract

631,947. Lathe &c. details. SKODA WORKS, PLZEN. July 24, 1946, No. 22084. Convention date, March 7, 1942. [Class 83 (iii)] Mechanism for limiting the feed motion in a lathe or other machine tool comprises a stop member on a rotatable stop drum and a stop lever which is brought into the path of the stop member by an auxiliary control drum provided in the feed drive. In an arrangement for limiting the traverse of a lathe saddle, a toothed wheel 2, secured to the feed pinion shaft 1 (Fig. 2, extended view in plane of paper for convenience), drives a stop drum 60. A number of adjustable stops 32 are provided in different planes on this drum and one of these is adapted to strike against the end of a selected lever 45 which is rotated into the path of the stop by a spring 5, the other end of the lever bearing against an adjustable ring member 4 on an auxiliary control drum 61. A gap in the ring adjusted previously into a predetermined position allows the lever to rock over at the desired moment to stop rotation of the drum 60 and thus limit the traverse movement of the saddle. A number of levers 45 equal to the number of stops on the drum 60 are provided and the drum' 61 is driven at a slower speed than the stop drum 60, either from the pinion 1 or from a separate pinion 7 meshing with the feed rack 6. Selector mechanisms.-A further control device for the levers 45 comprises a shaft 10 against which extension pieces, Fig. 1, on the levers bear, this shaft has flats arranged at predetermined positions around its circumference and a lever can only operate to stop the feed when its extension piece is adjacent a flat. The shaft 10 may be rotated by a hand lever or may be geared to rotate with a turret to stop the traverse at selected points according to the turret tool operating.