To provide a motor-driven chuck device capable of driving holding jaws to open/close even during the rotation of the main spindle of a machine tool.
This device has a chuck provided on an end of the main spindle 5 rotatably supported on a headstock of the machine tool and provided with an opening/closing mechanism for opening/closing the holding jaws for holding an object to be held, a driving motor provided on the headstock to drive the jaws to open/close, a draw tube 4 rotatably provided in a through hole in the spindle and driven to rotate relative to the spindle by the motor, a screw mechanism provided between the tube and the opening/closing mechanism to convert the rotational motion of the tube into axial rectilinear motion of the spindle, and a connect/non-connect switching means 7 provided between the spindle and the tube to bring the spindle and the tube into a non-connected state when the jaws make opening/closing motion and to bring the spindle and the tube into a connected state while the jaws hold the object.
| JP2018015893 | TENSION RELEASE UNIT |
| JPH11300512 | CHUCKING DEVICE |
| WO/2010/040681 | RECEPTACLE UNIT FOR TOOLS OR WORK PIECES AND SPINDLE ARRANGEMENT FOR TOOLS OR WORK PIECES |
MIYAGAWA KEIICHI
SASAZAWA YUKINAGA
