Rundschalttisch

摘要

853,517. Drilling-machine details. WITZIG, K. E., and FRANK, R., [trading as WITZIG & FRANK MASCHINENBAUGESELLSCAFT]. Dec. 17, 1956 [Dec. 17, 1955], No. 38409/56. Class 83 (3). A turret work-holder 13 for a machine-tool comprises work-grippers depending downwardly to enable swarf to fall away from the turret. One or both jaws 15, 16, Fig. 2, of each gripper on the turret 13 may be operated by a cam, electromagnet, electric motor or, as shown, by fluid-pressure acting on a piston 14 connected to the jaw 15, and preferably also to the jaw 16 by racks 22, 23, and a pinion 24. The closing force may be transmitted through springs. In Fig. 3, the grippers 27, 47, which are rotated about their own axis in the turret by gears 56 as this is indexed, are closed by an hydraulic ram 31 operating through a lever 30 bearing on a plunger 28 in the gripper. The end of the plungerbears against balls 35 in a sleeve 38 carried adjustably in a tube 54 by a nut 53. Depression of the plunger, from the position shown in broken lines, forces the balls over the conical end 40 of the sleeve into engagement with the conical end 39 of a jaw-carrier 41, which is thereby moved downwardly by the balls as they are cammed outwardly by the nose of the plunger. Upward movement of the lower jaw 47 is caused by a lever 43 engaged in pockets in the jaw-carrier 45 and in carrier 41 for the upper jaw 27. The movement of the balls 35 by the plunger 28 is irreversible, a cam 50 engaging followers 51 on the plungers to raise them when they arrive at the discharging-position, and a return-spring 42 opening the jaws. Swarf falls into a receptacle 55.