Drive transmission device and image forming apparatus including the same

摘要

A drive transmission device includes rotatable shafts, a first transmission mechanism that transmits first driving force, and a second transmission mechanism that transmits second driving force. The first driving force causes a specific rotatable shaft to rotate in a first rotation direction. The second driving force causes the specific rotatable shaft to rotate in a second rotation direction. The second transmission mechanism includes first and second gears, and a switching member that switches between coupling and decoupling of the first and second gears. While the first and second gears are coupled, the second driving force is transmitted to the specific rotatable shaft. The first transmission mechanism includes a cut-off member that cuts off transmission of the first driving force to the specific rotatable shaft upon the second driving force being transmitted to the specific rotatable shaft while the first driving force is being transmitted to the specific rotatable shaft.

主权项

1. A drive transmission device for transmitting driving force to a plurality of rotatable shafts, comprising:
the plurality of rotatable shafts; a drive source that generates driving force; a first transmission mechanism that transmits first driving force to a specific rotatable shaft among the plurality of rotatable shafts in accordance with driving force from the drive source, the first driving force causing the specific rotatable shaft to rotate in a first rotation direction; and a second transmission mechanism that transmits second driving force to the specific rotatable shaft in accordance with driving force from the drive source, the second driving force causing the specific rotatable shaft to rotate in a second rotation direction opposite to the first rotation direction, wherein the first transmission mechanism includes a cut-off member that cuts off transmission of the first driving force to the specific rotatable shaft upon the second driving force being transmitted to the specific rotatable shaft from the second transmission mechanism while the first driving force is being transmitted to the specific rotatable shaft, the second transmission mechanism includes
a first gear that rotates in accordance with driving force from the drive source,a second gear configured relative to the specific rotatable shaft such that driving force is transmitted therebetween, anda switching member that switches between enabling transmission of driving force from the first gear to the second gear and cutting off transmission of driving force from the first gear to the second gear, and while transmission of driving force from the first gear to the second gear is enabled, the second driving force is transmitted from the second transmission mechanism to the specific rotatable shaft and the specific rotatable shaft rotates in the second direction.