| 摘要 |
PROBLEM TO BE SOLVED: To adjust a phase without disjointing a once assembled gear by reducing the number of parts by a method wherein one end is connected to a first screw, the other end is connected to a transmission shaft, an idler spur gear, and an idler shaft, and two ounces of idler helical gears are fitted to the other end of the idler shaft. SOLUTION: A transmission shaft 13 is connected to a first screw 11, a thrust bearing 43 receiving a large trust load owing to the first screw 11 is fitted to the transmission shaft 13, and a motor 30 is connected to the output shaft 19. A second screw 12 is connected to a transmission shaft 41 wherein a helical gear 42 method with an opposed part of a pair or idler helical gears 39 is fitted. The idler helical gear 39 is fitted to an idler shaft 37, an idler spur gear 35 is fitted to an opposed end of the idler spur gear 35 is fitted to an opposed end of the idler helical gear 39 of the idler shaft 37, and an idler spur gear 35 meshes simultaneously with a spur gear 34 fitted to the transmission shaft 13 to which the first screw 11 is connected. |
