| 摘要 |
A finger chuck for use with a machine tool comprises a chuck main body having a front wall and a rear wall, the front wall and the rear wall defining a space therebetween. A centering device is supported by the front wall for centering the workpiece on the axis of the chuck main body. Jaws are supported by the front wall for holding the workpiece. A rearwardly protruding portion is provided on the front wall toward the rear wall within the space, and a cavity is defined in the protruding portion so as to open in the front surface of the front wall, the cavity accommodating at least part of the centering device. A drawing member extends through the rear wall in the axial direction, and is shifted by a drive source in the axial direction. A guide portion is disposed in the space integrally with the drawing member, so as to be guided on the protruding portion in the axial direction. A seat surface is formed around the guide portion, and a spider is supported on the seat surface for movement therealong. Axial movement of the drawing member causes opening and closing movements of the jaws through the spider. The distance of the workpiece mounting surface from the front wall is shortened so that the mechanical rigidity of the chuck is increased and its overall thickness is reduced with effective utilization of the interior space of the chuck. |
