| 摘要 |
1,038,705. Lathes. E. C. HAHN. Feb. 20, 1964 [Feb. 20, 1963], No. 7148/64. Heading B3T. A lathe tool slide 12, has hydraulic means 76, 74, Figs. 1 and 3 (not shown), for producing fast approach and retraction, and cam means 60, 62 for producing the cutting feed. In an automatic lathe several slides may be provided, the shape of the cams 62 allowing for holding back of the respective slides during actuation of the other slides. Carriage 12 is slidable towards work 14 on a support 10 against the action of a spring 80; and the carriage body 20 is connected to a piston 22. The latter is located in an hydraulic cylinder 18 slidable in the body, and having a rack 40 on its periphery. Fluid is supplied to cylinder 18 from a motor-driven pump 76, through a valve 74 and conduits 28, 31, 24a, 24b. A pinion 38 is carried by body 20 and cooperates with rack 40. A lever 42 is secured to a shaft 36, and is connected to a link 48, which in turn is connected to the bell-crank lever 52 of cam follower 60. An actuator 66 carrying adjustable lugs 68, 70 is driven synchronously with cam 62, and co-operates with a plunger 72 on valve 74. In operation, one revolution of cam 62 is required to complete the operation on work 14. Cam 62 rotates from the position of Fig. 1 (not shown) until the radius C engages roller 60, and lug 68 actuates valve 74. Fluid is supplied to chamber 32 to move cylinder 18 to the left, which rotates lever 42 through 180 degrees. Tool 26a, along with the slide is moved through distance a at a fast speed. Cam 62 continues to rotate, and the rising cam profile turns lever 50 clockwise, to provide the feed movement, through distance b. Lug 70 actuates valve 74 to produce movement of cylinder 18 to the right, to retract the slide through distance a<SP>1</SP> at a fast rate, and spring 80 moves the slide through distance b<SP>1</SP>. In a modification, Figs. 4 and 6 (not shown) pinion 38 is replaced by a quadrant 94. A fluid pressure motor comprises a number of vanes 120 on shaft 114 which are located in a hub 118 of lever 102, and are forced into engagement with radial walls 122 in the hub by fluid supplied through conduit 142 to provide the fast feed. A stop 160 is provided to limit the working stroke. |
