| 摘要 |
A collet assembly for a bending apparatus has a support ring the support ring being connected coaxially to a tubular support member, five jaws being pivotally connected to the free end of the support ring by means of parallelogram linkages, each of the parallel linkages having a pair of links one disposed radially inwardly of the other to permit movement of the jaws transverse to the axis of the support rings, the jaws being spaced angularly around the circumference of the support ring; an actuating assembly has an outer ring connected to a control sleeve slidably mounted on the tubular support member and an inner ring disposed on the internal diameter of the support ring, the inner ring defines a cam formation for engagement with corresponding formations on the inner link of each parallelogram linkage, the inner ring of the actuating assembly being connected to the outer ring through elongate slots in the support ring, so that the actuating assembly may be moved axially with respect to the support ring between a position in which the jaws clamp the outer surface of an elongate workpiece and a position in which the jaws are released from the outer surface of the elongate workpiece.
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