| 摘要 |
A motor is mounted on a base having a pair of horizontal rails on which a series of workpieces are mounted. A lifting frame and a transfer bar are mounted beneath the rails. The lifting frame carries four cam rollers. Four cams mounted on the base support the cam rollers such that as the lifting frame is moved back and forth, it either rises or falls on the base depending upon the frame's direction of motion. A motor is mounted on the base and connected by a linkage to the lifting frame to reciprocate it in a motion parallel to the rails. The transfer bar is mounted, on rollers on the lifting frame to rise and fall with the lifting frame as well as being horizontally moveable with respect to the lifting frame. A second linkage connects the motor to the transfer bar. The transfer bar has structure for engaging the workpiece such that as the motor is rotated, the transfer bar moves in a series of four-sided cycles in which it rises toward the rails to engage and lift the workpieces, then moves parallel to the guide rails to advance the workpiece in a step, then drops to deposit the workpieces on the rails, and then returns to its initial position. This cycle is repeated each time the motor shaft is rotated.
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