| 摘要 |
<p>1,121,390. Automatic lathes. E. C. HAHN, [trading as INDEX-WERKE K.G. HAHN & TESSKY]. 20 Dec., 1966 [21 Dec., 1965], No. 56992/66. Heading B3T. An automatic lathe comprises a control shaft 10 having cams 26 adjustable in grooves 28 thereon, which actuate valves 22 each of which controls the movement of a tool slide 20, and a lever system 90 for each control valve, which actuates a switch 96, to thus interrupt the control shaft drive when a slide 20 is being moved, so as to prevent more than one slide operating at the same time. Shaft 10 is driven by a motor 12 thourgh a variable speed drive 14 and gears 16, 18. Each of the slides 10 is moved by a double-acting cylinder 30 connected to a valve 22 by conduits 36, 38, a reversing valve 42, a check valve 50, and a quantity control valve 40. Each valve 22 comprises a slider 66, a spool 62, locking detents 74, 76, and spring urged pins 72, 70, and a reversing device 54 is aligned with slider 66. In operation, shaft 10 is rotated, cam 26 actuates a roller 68 carried by the slider 66 of one of the valves 22 and the spool 62 is moved downwardly, Fig. 1, to thus supply fluid to the relevant tool slide 10. Lever 110 pivots about an axis 118, a cam 92 actuates lever 120, to thus force a rod 116 downwardly so that lever 94 is pivoted about spindle 99, and switch 96 is actuated to switch off motor 12. Slide 10 continues to be fed to the workpiece 24 until slider 66 operates reversing device 54, and the direction of spool 62 of valve 22 is reversed, so that slide 10 is retracted. In a modification, the control valve (130), Fig. 3 (not shown), comprises a spool (132), having one locking pin (140) and the reversing device 54 acts on the spool.</p> |
