| 摘要 |
PROBLEM TO BE SOLVED: To reduce a rotational load when a development roll, which is rotatively supported by a first rotating body, is rotatively driven at a preliminarily fixed rotation position of the first rotating body.SOLUTION: When the first rotating body 52 rotates and the development roll 54 rotatively moves from a non-counter position to a counter position, a gear 74 rotatively moves, while contacting the contact surface of a guide part 98A; and the gear 74 gradually moves, by the pressing force of a compression coil spring 90, to a transmission position on a supporting member 78 side along the slope of the contact surface. According to this, a pin 82 is inserted into the groove part 84 of the gear 74, and driving force from a driving motor 72 is transmitted from the gear 74 to a rotary shaft 76, and then the development roll 54 rotates. The compression coil spring 90 becomes longer then, as compared with the case that the gear 74 is located at a non-transmission position, and the pressing force acting on the gear 74 is consequently decreased, and the rotational load is reduced. |
