| 摘要 |
PROBLEM TO BE SOLVED: To suppress unevenness of hand movement etc., due to a backlash while suppressing an increase in rotational torque.SOLUTION: There is provided a gear body 41 to which a transmission gear transmits rotational force from a power source. The gear body includes: an axle 60 rotatable around an axis O; a first gear 62 which is fixed to the axle and has a tooth part 62a formed to mesh with the transmission gear; a second gear 63 which is fitted rotatably to the axle and has a tooth part 63a formed to mesh with the transmission gear; and a power transmission body 64 which rotates the first bear and second gear inversely to each other according to the rotational force transmitted to the second gear. The first gear and second gear rotate inversely to each other and then the tooth part of the first gear and the tooth part of the second gear come into contact with at least one tooth part of the transmission gear, so that the rotational force is transmitted from the transmission gear. |
