| 摘要 |
616,452. Chucks. BECHLER, A. Sept. 4, 1946, No. 26526. Convention date, June 17. [Class 83 (iii)] In a chuck for automatic lathes in which an operating sleeve for a collet is actuated by levers fulcruming against a fixed point on the spindle, at least one inclined surface is interposed between two of a series of parts between the fixed point and the operating sleeve, the position of the latter being adjusted by a method of feeling the diameter of the workpiece before the levers operate the collet. A ring 36, having an inclined surface 35, is anchored on the spindle 10 to provide the fixed point against which the inclined surface 34 on a sliding ring 33 bears. The ring 33 carries bevel teeth engaging a bevel pinion 28 which, when turned, causes the inclined surfaces 34, 35 to retract the ring 33 and hence a sleeve 21 carrying dogs 20 which actuate the collet 15 by means of the operating sleeve 16. The bevel pinion 28 is turned by an integral pinion 29 engaging a rack 30 on a rod held in a friction grip 40, 41 carried on the yoke-operated sleeve 26. When the workpiece is lightly gripped by the collet, the friction grip slips and a cam surface 25 on the sleeve 26 then contacts levers 22 pivoted on the sleeve 21 which is thus moved to grip the work firmly. |
