| 摘要 |
1282475 Screw-cutting lathes; screwing; chucks SORENSON ENG Inc 3 Oct 1969 [7 Oct 1968] 48707/69 Headings B3B B3N and B3T An automatic machine tool comprises a rotatable and reoiprocable auxiliary spindle 17 and collet assembly 16 which is driven via rods 70 which are slidable in a pulley 18. The spindle 17 is mounted by bearings 76 in a housing 74 which can be reciprocated via parts 46, 48 by cam 44. A collet 72 is attached to a draw bar 73 and holds a workpiece 38 which is machined by tools x<SP>1</SP>, y<SP>1</SP> and z<SP>1</SP>. Movement of the tools is controlled by cam 60 and a locking pin 62 engages in one of holes x, y or z to align the workpiece with a respective tool. The collet 72 is spring biased open and is controlled by a collet control head 19. To shut the collet a spool 36 is moved forward, movement being controlled by a trip dog holder cam 22, so that ends 114 of levers 94 are moved inward in which case heel 112 of foot 108 pushes drawbar flange 96 rearward. The flange 96 is a press fit on the drawbar 73 and thus the flange moves the drawbar rearward. Between housing 74 and spindle 17 there is positioned a felt lubrication wick 82. Within the drawbar there is an ejector rod 100 which is fixed and of such length to operate when assembly 16 reciprocates to a rearward position. Workpieces 38 are obtained by parting off from bar stock 12 which is fed through spindle 10 and worked on by tools mounted in holders, one of which is designated 14. |
