| 摘要 |
An intermittent drive member comprises a shaft with a spiral groove formed in the outer periphery of the shaft. The spiral groove includes a plurality of groove portions each having a linear bottom portion with a lead angle of zero degrees and a plurality of chamfered portions. The groove portions are successively formed by being axially shifted one after one along the shaft, and each of the chamfered portions forms the connection between adjacent groove portions. The intermittent drive member is employed in a mechanism which includes an electric motor for driving the shaft and a movable member having a tip end portion slidably fitted in the spiral groove so that the movable member is displaced when the shaft is rotated. The shaft is rotated to move the movable member in a predetermined direction when the tip end portion is in each of the chamfered portions, while the motor is deenergized to stop the movement of the shaft when the tip end portion is in each of the groove portions. |
