GB933218A - Work-transferring apparatus in lathes - Google Patents

Abstract

933,218. Lathes. E. C. HAHN, [trading as INDEX-WERKE KOMM. GES. HAHN & TESSKY]. Nov. 17, 1961 [Dec. 17, 1960], No. 41233/61. Class 83 (3). In an automatic lathe, work 50 is transferred from the spindle-nose 92 to another position for further treatment by a bevel-closing collet 30 which is rotatable by a clutch 54, 55 to index the work. A screw 50 may be severed from a stock-bar 94 by a tool 95 and transferred to a grinding station, or one in which intersecting slots are cut in the screw-head by a saw 105, the screw being indexed between saw cuts. A pivoted and axially-movable arm 12 carries the collet 30 in a rotatable sleeve 20 formed with clutch-teeth 55. Co-operating teeth 54 are on a ring 52 pressed by a spring 57 towards the teeth 55 and formed with an inclined slot 60 engaged by a peg 62 on a plunger 69. Movement of the plunger against its return spring 68 indexes the collet, which is held during return movements of the ring 52 by a spring-pressed tooth, Fig. 5 (not shown), engaging locking grooves 80 in the sleeve 20. Alternatively, a screw-and-nut and toothed gears may form the driving elements between the plunger 69 and ring 52. In operation, the transfer arm 12 is moved axially to engage the work, which it transfers to a clamping position, between the spindle-nose 92 and the saw 105, in which the collet is pressed by a stop 96 into the bevel-closing sleeve 20 for clamping the work. The work is then transferred to the saw 105 and moved against the saw, in the direction D. If a second slot is required, the arm is withdrawn to carry the plunger 69 against an abutment and index the work. To eject the work, the arm 12 is withdrawn against a stop (not shown), which engages a collar 45 on the end of the collet, releasing the collet. A resilient ejector with the stop bears on a rod 42 in the collet and ejects the work.