| 摘要 |
1,241,182. Chucks. CRI-DAN. 25 Sept., 1968 [2 Oct., 1967], No. 45576/68. Heading B3B. A clamping chuck for machine tools, e.g. a lathe, comprises a body supporting a set of clamping jaws 2 operated by a mechanism compensating for eccentricity of a workpiece 7 to be machined, the mechanism including an annular member 15 and a sleeve 16 coaxial with the chuck, the annular member 15 being movable radially relative to the sleeve, there being a locking element 17, 18 between the annular member and sleeve capable of locking the annular member in a required position. The chuck also includes a set of centring jaws 3 operated by a second mechanism independent of the first one which effects equal displacement of said centring jaws in relation to the axis of rotation of the chuck, and the centring jaws are each moved along an inclined path towards the workpiece so that they contact the surface to be machined at a distance in front of the chuck body to centre the workpiece in the machining zone. 'The centring jaws 3 are retracted after the clamping jaws 2 are actuated. The centring jaws 3 include workpiece engaging dogs 28 and are moved through inclined bores 27 by an actuating mechanism including an electric or hydraulic motor driven gear ring 37 driving axially fixed nuts 33 that axially move screws 32 to move an annular ring 31. The centring .jaws 3 are connected by a dovetail and slot arrangement to an annular ring 29 which is acted upon by the annular ring 31. The clamping jaws 2, include workpiece engaging dogs 24 and members 25 individually adjusted by screws 26. The clamping jaws are operated'by a pivoted lever 8 actuated by a cam surface 14 on the annular member 15 that is moved axially -via locking element 17, 18, sleeve 16, and thrust bearing 23, by a member 22 that is moved by a hydraulic or pneumatic piston. The locking element comprises interengaging discs that allow radial movement of the annular member 15 before they frictionally grip each other. The chuck is attached to e.g. a lathe spindle 5, by screws 4. |
