| 摘要 |
PURPOSE:To decrease a number of part items, improve characteristic of assembling a device and reduce costs, by using a reduction gear mechanism which provides a pinion gear, ring gear meshed with this pinion gear and a track control plate controlling motion of the pinion gear. CONSTITUTION:If a motor shaft 17 rotates, an eccentric shaft 18 provided in its shaft end causes a pinion gear 19 to rotate eccentrically. Here the pinion gear 19 is limited only to its reciprocating movement in the direction of an X-axis because guide pins 20 provided in the pinion gear 19 are fitted into long holes 25 of a track control plate 21. While the pinion gear 19 is limited only to its reciprocating movement also in the direction of Y-axis because arms 26 sliding in slots 24 of a gear case 23 are provided in the track control plate 21. Under this limitation in the directions of the X and Y axes, the pinion gear 19 revolves around a core of the motor shaft 17 serving as the center. Then, a ring gear 22 meshed with the pinion gear 19 is driven in a rotary direction equal to that of the motor shaft 17, thus reducing speed. |
