| 摘要 |
1,214,288. Work-holders. H. HABEGGER. 30 Jan., 1969 [9 Feb., 1968], No. 5271/69. Heading B3B. A guiding sleeve for atuomatic lathes with a sliding headstock comprises rollers 7 wherein radial clearance with bar stock 4 is controlled by axial movement of a chuck 8 in housing 1 wherein a conical surface 18 of housing 1 cooperates with a conical surface 17 of the chuck 8 to operate its jaws (16), Fig. 2 (not shown), these conical surfaces could have a relatively small opening angle, axial clearance is controlled by a control member 9 which abuts a projection 12 of a nut 11, variation in clearance being achieved by a spacing ring 24 clamped between the nut 11 and body 1. Closing and opening of jaws (16) is brought about by relative rotary moveme t between member 9 and the chuck 8 so that screw threads 19 and 22 produce axial movement of the chuck. Body 1 and the chuck are held together for rotary motion by a stud 6 engaging a slot 15. The jaws of the chuck are defined by angled slots 14 engaging with slots 15, see Fig. 2 (not shown). Projection 12 has three radial slots 25 and the parts of the projections are slightly bent inwards to grip member 9 to avoid undesired rotation of the member. The rollers are preferably made of sintered metallic carbide and remain in position when no bar stock is in the sleeve due to very small clearances between adjacent rollers. The operation of member 9 could be automatic. |
