| 摘要 |
PURPOSE:To enable the correct transmission of power to be performed, by utilizing a star gear mechanism or a planet gear mechanism, in which at least a pair of intermediate gears are meshed interposing between a sun gear and an internal gear, and placing the backlash, when rotation of a transmission shaft is switched to normal and reverse directions, substantially in a zero condition. CONSTITUTION:A shaft 9 of one intermediate gear 8 can be movably adjusted substantially along a circumferential direction, with the axial center of a sun gear 5 serving as the center, by a movement adjusting mechanism comprising a rod 10 or the like. And under a condition that rotation of the sun gear 5 is stopped, the shaft 9 of the intermediate gear 8, which moves its position to be adjusted removing the backlash of the gear, is locked to that position. Under this condition, since a gear train in a side, where power is not transmitted, maintains a contact condition only performing a follow-up rotation, a side of the gear train, performing a follow-up motion in the contact condition, immediately performs power transmitting action at the moment when the rotation is switched from a normal direction C to a reverse direction R or from the reverse direction R to the normal direction C, and the direction of rotation is switched substantially in a zero backlash condition. |
