| 摘要 |
756,947. Lathe details. BATIGNOLLES CHATILLON, [formerly COMPAGNIE GENERALE DE CONSTRUCTION DE LOCOMOTIVES BATIGNALLES - CHATILLON July 21, 1953 [Nov. 5, 1952], No. 20230/53. Class 83 (3). The cycle of movement of a tool-carriage 10, Fig. 1, of a machine tool, e.g. a lathe, which cycle consists of the rapid approach, operative feed of the tool into the work, and rapid withdrawal, is effected by a piston 13, Fig. 3, operated by hydraulic-fluid under the control of a valve 22, Fig. 5. The fluid is supplied by pump 30 to cylinder-space 32 via line 33, and to cylinder-space 39 via line 40 and bore 41 in the piston, the pressure in space 39 being controlled by the valve which, when the solenoid 26 is energized, is pressed down by spring 24 to open port 42 and connect line 40 to the fluid reservoir 31 via line 43. The piston then causes the carriage to approach the work and is stopped when the valve abuts a part 21 of a rack 18 slidable endwise in the carriage-support 1. The rack meshes with a pinion 19 on a shaft 44 engaging a worm-wheel 47 through a free-wheel 45, and wheel 47 meshes with worm-shaft 49, the device holding the rack stationary when shaft 49 is stationary. Rotation of the shaft is controlled by solenoid 58 and in one direction, the free-wheel is released permitting spring 24 to lower the valve and the rack, whereby the tool is fed into the work. At the required depth the carriage actuates contacts to de-energize the coil 26, whereupon the piston causes rapid withdrawal of the carriage which carries with it the rack. The feeding-speed of the tool into the work is variable by varying the speed of shaft 49, and the direction of rotation of the shaft is reversible to raise the tool. Support 1 is mounted on bars 2a, 2b and clamped in the required position. Shaft 49 is driven from the headstock spindle 54 via pulleys 53, 57 and change-speed gears 60, 61. |
