| 摘要 |
A fixed length collet chuck assembly for holding a workpiece in which the collet only translates radially and not axially is provided. The fixed length collet chuck has a longitudinal, central axis and includes a chuck body assembly and a collet. As a draw tube is pulled toward the spindle of a machine, such as a lathe, a tapered actuator forces ball bearings against a retaining plate and the ball bearings are forced radially outwards causing a taper ring to move axially away from the spindle and into contact with a bushing ring. The bushing ring is connected to a collet sleeve through three bushings which are radially and equally spaced around the longitudinal, central axis of the assembly. The inner surface of the collet sleeve tapers outward from the longitudinal, central axis of the assembly. A collet bears against the inner tapered surface of the collet sleeve. As the bushing ring moves axially away from the spindle, the collet sleeve moves in the same direction with its inner tapered surface bearing against the collet and causing the collet to collapse and move radially inward, thus gripping a workpiece. By actuating the fixed length collet chuck on a pull stroke, the collet will achieve greater clamping force by concentrating the actuating force in the direction of the machine spindle. This new and improved design is also compatible with the pull stroke of servo stop type bar feeders.
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