Abstract: There are provided a sheet processing apparatus which can perform a punching process while suppressing decrease in productivity, and an image forming apparatus including the sheet processing apparatus. In a third carry-in route R3 branching from a first carry-in route, a discharge roller and a buffer roller convey a sheet for which the punching process has been performed by a punching unit, so that an upstream end in a sheet conveyance direction of the sheet for which the punching process has been performed precedes an upstream end in the sheet conveyance direction of a succeeding sheet following the sheet for which the punching process has been performed.

Abstract: In order to stack a larger number of sheets on trays by reducing a total thickness of the trays and enabling the trays to ascend and descend actually over long distances, a sheet stacking device includes an upper-tray and a lower-tray which are ascendible and descendible and on which sheets delivered from a delivery roller pair are stacked, a motor and a belt for allowing both the trays to ascend and descend, a clutch for disconnecting the upper-tray and the belt from each other, and a claw and a rack for stopping self-weight descent of the upper-tray when the clutch effects the disconnection. A clearance between the upper-tray under the disconnection by the clutch and in the stop of the self-weight descent by the claw engaged with the rack and the lower-tray connected to the belt is adjustable by ascent and descent of the lower-tray by the motor.

Abstract: In order to stack a larger number of sheets on trays by reducing a total thickness of the trays and enabling the trays to ascend and descend actually over long distances, a sheet stacking device includes an upper-tray and a lower-tray which are ascendible and descendible and on which sheets delivered from a delivery roller pair are stacked, a motor and a belt for allowing both the trays to ascend and descend, a clutch for disconnecting the upper-tray and the belt from each other, and a claw and a rack for stopping self-weight descent of the upper-tray when the clutch effects the disconnection. A clearance between the upper-tray under the disconnection by the clutch and in the stop of the self-weight descent by the claw engaged with the rack and the lower-tray connected to the belt is adjustable by ascent and descent of the lower-tray by the motor.

Abstract: There are provided a sheet processing apparatus which can perform a punching process while suppressing decrease in productivity, and an image forming apparatus including the sheet processing apparatus. In a third carry-in route R3 branching from a first carry-in route, a discharge roller and a buffer roller convey a sheet for which the punching process has been performed by a punching unit, so that an upstream end in a sheet conveyance direction of the sheet for which the punching process has been performed precedes an upstream end in the sheet conveyance direction of a succeeding sheet following the sheet for which the punching process has been performed.

Abstract: A sheet processing apparatus includes: a buffer unit which stores plural supplied sheets with upstream edges in a conveying direction thereof aligned; a processing tray on which sheets discharged from the buffer unit are stacked; and an oscillation roller pair and a return roller which convey the sheet stacked on the processing tray to bring the sheet into abutment against a stopper for receiving the upstream edge of the sheet. The buffer unit is adapted to align the upstream edges of only sheets to be stored before a sheet to be supplied last among the sheets to be stored.

Abstract: A sheet processing apparatus is provided with a processing tray on which sheets are to be stacked and subjected to a processing, a stack tray provided in the downstream of the processing tray with respect to the sheet conveying direction on which sheets are to be stacked, an oscillation roller pair for conveying the sheets stacked on the processing tray to the stack tray, and a trailing edge assist for conveying the sheet stacked on the processing tray toward the stack tray. The sheets stacked on the processing tray are discharged to the stack tray by the oscillation roller pair and the trailing edge assist.

Abstract: A sheet processing apparatus is provided with a processing tray on which sheets are to be stacked and subjected to a processing, a stack tray provided in the downstream of the processing tray with respect to the sheet conveying direction on which sheets are to be stacked, an oscillation roller pair for conveying the sheets stacked on the processing tray to the stack tray, and a trailing edge assist for conveying the sheet stacked on the processing tray toward the stack tray. The sheets stacked on the processing tray are discharged to the stack tray by the oscillation roller pair and the trailing edge assist.

Abstract: A sheet processing apparatus includes: a buffer unit which stores plural supplied sheets with upstream edges in a conveying direction thereof aligned; a processing tray on which sheets discharged from the buffer unit are stacked; and an oscillation roller pair and a return roller which convey the sheet stacked on the processing tray to bring the sheet into abutment against a stopper for receiving the upstream edge of the sheet. The buffer unit is adapted to align the upstream edges of only sheets to be stored before a sheet to be supplied last among the sheets to be stored.

Abstract: A sheet processing apparatus is provided with a processing tray on which sheets are to be stacked and subjected to a processing, a stack tray provided in the downstream of the processing tray with respect to the sheet conveying direction on which sheets are to be stacked, an oscillation roller pair for conveying the sheets stacked on the processing tray to the stack tray, and a trailing edge assist for conveying the sheet stacked on the processing tray toward the stack tray. The sheets stacked on the processing tray are discharged to the stack tray by the oscillation roller pair and the trailing edge assist.

Abstract: A sheet processing apparatus includes: a buffer unit which stores plural supplied sheets with upstream edges in a conveying direction thereof aligned; a processing tray on which sheets discharged from the buffer unit are stacked; and an oscillation roller pair and a return roller which convey the sheet stacked on the processing tray to bring the sheet into abutment against a stopper for receiving the upstream edge of the sheet. The buffer unit is adapted to align the upstream edges of only sheets to be stored before a sheet to be supplied last among the sheets to be stored.

Abstract: A sheet processing apparatus includes: a buffer unit which stores plural supplied sheets with upstream edges in a conveying direction thereof aligned; a processing tray on which sheets discharged from the buffer unit are stacked; and an oscillation roller pair and a return roller which convey the sheet stacked on the processing tray to bring the sheet into abutment against a stopper for receiving the upstream edge of the sheet. The buffer unit is adapted to align the upstream edges of only sheets to be stored before a sheet to be supplied last among the sheets to be stored.

Abstract: A sheet processing apparatus includes: a buffer unit which stores plural supplied sheets with upstream edges in a conveying direction thereof aligned; a processing tray on which sheets discharged from the buffer unit are stacked; and an oscillation roller pair and a return roller which convey the sheet stacked on the processing tray to bring the sheet into abutment against a stopper for receiving the upstream edge of the sheet. The buffer unit is adapted to align the upstream edges of only sheets to be stored before a sheet to be supplied last among the sheets to be stored.

Abstract: A sheet processing apparatus is provided with a processing tray on which sheets are to be stacked and subjected to a processing, a stack tray provided in the downstream of the processing tray with respect to the sheet conveying direction on which sheets are to be stacked, an oscillation roller pair for conveying the sheets stacked on the processing tray to the stack tray, and a trailing edge assist for conveying the sheet stacked on the processing tray toward the stack tray. The sheets stacked on the processing tray are discharged to the stack tray by the oscillation roller pair and the trailing edge assist.

Abstract: A sheet processing apparatus is provided with a processing tray on which sheets are to be stacked and subjected to a processing, a stack tray provided in the downstream of the processing tray with respect to the sheet conveying direction on which sheets are to be stacked, an oscillation roller pair for conveying the sheets stacked on the processing tray to the stack tray, and a trailing edge assist for conveying the sheet stacked on the processing tray toward the stack tray. The sheets stacked on the processing tray are discharged to the stack tray by the oscillation roller pair and the trailing edge assist.

Abstract: A sheet processing apparatus includes: a buffer unit which stores plural supplied sheets with upstream edges in a conveying direction thereof aligned; a processing tray on which sheets discharged from the buffer unit are stacked; and an oscillation roller pair and a return roller which convey the sheet stacked on the processing tray to bring the sheet into abutment against a stopper for receiving the upstream edge of the sheet. The buffer unit is adapted to align the upstream edges of only sheets to be stored before a sheet to be supplied last among the sheets to be stored.

Abstract: A sheet processing apparatus is provided with a processing tray on which sheets are to be stacked and subjected to a processing, a stack tray provided in the downstream of the processing tray with respect to the sheet conveying direction on which sheets are to be stacked, an oscillation roller pair for conveying the sheets stacked on the processing tray to the stack tray, and a trailing edge assist for conveying the sheet stacked on the processing tray toward the stack tray. The sheets stacked on the processing tray are discharged to the stack tray by the oscillation roller pair and the trailing edge assist.