| 摘要 |
When a rotary drive source on a body is energized, a drive pulley is rotated, and the rotary drive power from the drive pulley is transmitted to a driven pulley by a drive power transmitting belt. A slotting mechanism integrally coupled to the driven pulley is rotated and inserted into a larger end hole defined in a connecting rod. A cutter of the slotting mechanism forms a first slot having a substantially V-shaped cross section in the inner circumferential surface of the larger end hole and then a second slot having a substantially V-shaped cross section in the inner circumferential surface of the larger end hole at a position facing the first slot across the axis of the connecting rod. The first and second slots have a symmetrical shape.
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