| 摘要 |
An electric chuck for machine tools, which is not provided with any special drive means for opening and closing a gripping pawl of the chuck, and is easy to change a gripping force and simple in construction. Chuck fixing means (40) is a fixing mechanism for fixing a chuck body (20) to a spindle stock (1). A positioning pin drive mechanism (42) has a positioning pin (43), on which a piston (44) is formed. When a pressure air is supplied to a cylinder (46), a tip end of the positioning pin (43) is inserted into a positioning hole (41). When a built-in motor (4) is actuated to rotate a scroll (17) together with rotation of a spindle (2), a jaw (30) is radially driven to grip or release a workpiece. <IMAGE> |
