| 摘要 |
An image forming apparatus including a transmission mechanism transmitting a driving force in a transmission direction from a driving source to an output unit, the transmission mechanism including a movable gear configured to move between a transmission position where, when the driving source generates the driving force in a first rotational direction, and a clutch is in a rotating state, the movable gear is allowed to rotate without contacting a lock member, and a restriction position where, when the driving source generates the driving force in a second rotational direction, the clutch is in an idling state, the movable gear is restricted from rotating by contact with the lock member. |
| 主权项 |
1. An image forming apparatus comprising:
a driving source configured to generate a driving force in a first rotational direction and a second rotational direction; an output unit configured to output the driving force transmitted from the driving source; and a transmission mechanism configured to transmit the driving force in a transmission direction from the driving source to the output unit, the transmission mechanism comprising:
a gear train comprising:
a first gear;a second gear having a rotational axis that is positionally coincident with a rotational axis of the first gear;a movable gear disposed downstream relative to the second gear in the transmission direction; andan output gear connected with the output unit, the output gear being configured to be un-rotatable relative to the output unit;a clutch configured to switch between:
a rotating state to cause the second gear to rotate in accordance with rotation of the first gear; andan idling state to allow the first gear to idle relative to the second gear; anda lock member configured to restrict rotation of the movable gear, when contacting the movable gear, wherein the movable gear is configured to move between:
a transmission position where, when the driving source generates the driving force in the first rotational direction, and the clutch is in the rotating state, the movable gear is allowed to rotate without contacting the lock member, while engaging with an upstream gear and a downstream gear relative to the movable gear in the transmission direction; anda restriction position where, when the driving source generates the driving force in the second rotational direction, the clutch is in the idling state, and the rotation of the first gear is transmitted to the second gear by an idling torque of the clutch, the movable gear is restricted from rotating, by contacting the lock member, while engaging with the upstream gear and the downstream gear relative to the movable gear in the transmission direction. |
