Abstract: A sheet feed device that includes a sheet feed tray configured to be enabled to be drawn from a main body of an image forming apparatus; a bottom plate arranged in the sheet feed tray and configured to stack thereon a plurality of sheets; a driving unit configured to move the bottom plate upward; a drive transmitting unit configured to transmit a driving force from a drive source arranged on the main body to the driving unit; and a one-way rotation transmitting unit configured to unidirectionally transmit input from the drive transmitting unit to the driving unit and configured to be arranged on one side of the drive transmitting unit opposite to a side connected to the driving unit.

Abstract: In the present invention, when a status of clogging a paper due to some cause occurs, controls of inverting a conveyance roller and returning the jammed paper in a paper feeding tray is performed. At this time, the position of a paper damming up member is lowered by an actuator when the jammed paper is returned to the paper feeding tray and the conveyance roller is inverted so as to avoid a state in which the paper damming up member 33 hinders the returning of the paper and the paper cannot be returned to the paper feeding tray. The paper damming up member is lowered to a position that is lower than a conveyance guide plate at a downstream side in a paper conveying direction. Then, the paper is returned to the paper feeding tray without damage. The returned paper can be reused.

Abstract: A sheet feed device comprises: a sheet feed tray configured to be enabled to be drawn from a main body of an image forming apparatus; a bottom plate arranged in the sheet feed tray and configured to stack thereon a plurality of sheets; a driving unit configured to move the bottom plate upward; a drive transmitting unit configured to transmit a driving force from a drive source arranged on the main body to the driving unit; and a one-way rotation transmitting unit configured to unidirectionally transmit input from the drive transmitting unit to the driving unit and configured to be arranged on one side of the drive transmitting unit opposite to a side connected to the driving unit.

Abstract: In the present invention, when a status of clogging a paper due to some cause occurs, controls of inverting a conveyance roller and returning the jammed paper in a paper feeding tray is performed. At this time, the position of a paper damming up member is lowered by an actuator when the jammed paper is returned to the paper feeding tray and the conveyance roller is inverted so as to avoid a state in which the paper damming up member 33 hinders the returning of the paper and the paper cannot be returned to the paper feeding tray. The paper damming up member is lowered to a position that is lower than a conveyance guide plate at a downstream side in a paper conveying direction. Then, the paper is returned to the paper feeding tray without damage. The returned paper can be reused.