Abstract: A sheet processing apparatus includes a processing tray on which sheets are stacked in a bundle form, an intermediate portion stapler which staples the intermediate portion of the sheet bundle stacked on the processing tray, a sheet bundle conveying member which conveys the stapled sheet bundle, a curved sheet bundle conveying path which is downwardly curved on the downstream side of the processing tray with respect to the sheet conveying direction and adapted to guide the sheet bundle conveyed by the sheet bundle conveying member, and a folding device which is arranged in the intermediate portion of the curved sheet bundle conveying path and which folds the stapled sheet bundle, wherein the processing tray is set to be lower on the upstream side than on the downstream side with respect to the sheet conveying direction, and wherein the curved guide path has an extended portion extending to a position under the stacking portion.

Abstract: The sheet processing apparatus is equipped with a process tray on which sheets conveyed are stacked, a return belt which moves the sheets stacked on the process tray, a trailing edge stopper which receives an end portion of the sheets moved by the return belt, and a conveyance assist roller which comes into contact with the sheets on the upstream side of the return belt with respect to the sheet moving direction and imparts a load to the movement of the sheets. The return belt moves the sheets to which a load has been imparted by the conveyance assist roller and causes them to be abutted on the trailing edge stopper.

Abstract: A feeding tray for feeding sheets from the left side thereof and a feeding tray for feeding sheets from the right side thereof are disposed on a multiple inserter, and selectively employing the feeding tray for feeding sheets from the left side thereof and the feeding tray for feeding sheets from the right side thereof allows reversal actions of sheets to be eliminated.

Abstract: A sheet processing device has a sheet conveying section for conveying sheets to a sheet processing section. The sheet conveying section has a sheet standby unit including a stacking device for stacking a predetermined number of sheets in a linear state, and a bundle conveying device for conveying the sheet bundle stacked in a linear state, whereby the predetermined number of sheets are conveyed to the sheet processing section after having been stacked in a linear state.

Abstract: An image forming apparatus which includes: an image forming apparatus main body provided with an image forming portion for forming an image on a sheet; an upstream-side sheet feed unit which is juxtaposed to the image forming apparatus main body and feeds a sheet contained therein to the image forming portion; a sheet treatment portion for treating a sheet fed thereto; and a downstream-side sheet feed unit which is juxtaposed between the image forming apparatus main body and the sheet treatment portion and feeds a sheet contained therein to the sheet treatment portion, in which each of the upstream-side sheet feed unit and the downstream-side sheet feed unit is selectively attachable to the image forming apparatus main body, and the upstream-side sheet feed unit and the downstream-side sheet feed unit have the same construction.

Abstract: A feeding tray for feeding sheets from the left side thereof and a feeding tray for feeding sheets from the right side thereof are disposed on a multiple inserter, and selectively employing the feeding tray for feeding sheets from the left side thereof and the feeding tray for feeding sheets from the right side thereof allows reversal actions of sheets to be eliminated.

Abstract: There is provided a sheet processing apparatus that is capable of allowing a decrease in the speed at which sheets are discharged to a stacking device even if sheets are conveyed into the sheet processing apparatus at short time intervals, or capable of eliminating the necessity of using an aligning device that can perform each alignment at a high speed, or capable of reducing the number of times of operations to be performed by the aligning device, and an image forming apparatus that is provided with the sheet processing apparatus. A plurality of sheets being conveyed is superposed. The sheets conveyed from the sheet superposing device are stacked. The sheets stacked in the stacking device are aligned. A sheet superposing device superposes a plurality of sheets being conveyed. A stacking device stacks thereon the sheets conveyed from said sheet superposing device are stacked. An aligning device aligns the sheets stacked in said stacking device.

Abstract: An image forming apparatus has an image forming section for forming images on sheets; a sheet supply section for holding the sheets and supplying them to the image forming section; and a reverse section, disposed between the sheet supply section and the image forming section, for selectively reversing the sheets from the sheet supply section. An inserter set holds and supplies sheets for insertion between sheets having images formed thereon by the image forming section.

Abstract: A sheet processing device has a sheet conveying section for conveying sheets to a sheet processing section. The sheet conveying section has a sheet standby unit including a stacking device for stacking a predetermined number of sheets in a linear state, and a bundle conveying device for conveying the sheet bundle stacked in a linear state, whereby the predetermined number of sheets are conveyed to the sheet processing section after having been stacked in a linear state.

Abstract: The present invention discloses a sheet processing unit which can control the timing in conveying successively fed sheets to a sheet ejecting mechanism in accordance with operating conditions. The sheet processing unit comprises a sheet overlapping mechanism which overlaps successively fed sheets together, a conveying mechanism which conveys the sheets from the sheet overlapping mechanism, an ejecting mechanism which ejects the sheets conveyed by the conveying mechanism, and a control unit which electrically controls operations of the sheet overlapping mechanism, the conveying mechanism, and the ejecting mechanism. The control unit changes the number of sheets to be overlapped together at the sheet overlapping mechanism in accordance with information on the conditions for operation of the sheet processing unit inputted from an input unit.

Abstract: An image forming apparatus which includes: an image forming apparatus main body provided with an image forming portion for forming an image on a sheet; an upstream-side sheet feed unit which is juxtaposed to the image forming apparatus main body and feeds a sheet contained therein to the image forming portion; a sheet treatment portion for treating a sheet fed thereto; and a downstream-side sheet feed unit which is juxtaposed between the image forming apparatus main body and the sheet treatment portion and feeds a sheet contained therein to the sheet treatment portion, in which each of the upstream-side sheet feed unit and the downstream-side sheet feed unit is selectively attachable to the image forming apparatus main body, and the upstream-side sheet feed unit and the downstream-side sheet feed unit have the same construction.

Abstract: The invention provides a sheet processing apparatus including a sheet processing portion for processing a sheet, and a sheet conveying portion for conveying a sheet to the sheet processing portion, wherein the sheet conveying portion includes a sheet conveying unit having a sheet intake port, a sheet discharge port, and a linear sheet conveying path for conveying the sheet from the sheet intake port to the sheet discharge port, and a plurality of sheet conveying units are disposed in parallel such that respective sheet conveying paths thereof are positioned on the substantially same plane and in a rearrangeable fashion.

Abstract: A sheet treating apparatus for avoiding electrostatic charge accumulation discharges the sheet P, bearing an image thereon, onto discharge sheet stacking trays provided on the side part of the main body, and receives the trailing end of the sheet by the side part of the main body, and is provided with a grounding member for grounding the sheet by contact with the trailing end of the sheet.

Abstract: A sheet treating apparatus for avoiding electrostatic charge accumulation discharges the sheet P, bearing an image thereon, onto discharge sheet stacking trays provided on the side part of the main body, and receives the trailing end of the sheet by the side part of the main body, and is provided with a grounding member for grounding the sheet by contact with the trailing end of the sheet.

Abstract: A sheet punching device includes a punch and a die which cut a hole in a sheet, a punch debris conveying device for conveying punch debris produced when the punch and the die cut a hole in the sheet, and a punch debris box for receiving the punch debris which has been conveyed by the punch debris conveying device.

Abstract: The present invention provides a sheet process apparatus comprising a sheet discharge means for discharging a sheet, a first stacking means for stacking the sheet discharged by the sheet discharge means, a bundle discharge means for discharging a sheet bundle rested on the first stacking means, and a second sheet stacking means for stacking the sheet bundle discharged by the bundle discharge means. Wherein the number of sheets in the sheet bundle to be discharged onto the second stacking means is selected to become smaller, when a sheet size in a sheet conveying direction is great, than when a sheet size in the sheet conveying direction is small.

Abstract: A sheet processing apparatus has a first stacker for stacking discharged sheets; a feeder for feeding a set of sheets from the first stacker; and second stacker for stacking the set of sheets fed by the feeder. A shifting device shifts the sheets stacked on the first stacker and; a controller groups the sheets in a set into a plurality of groups of sheets, and stacks, shifts and feeds the sheets, for each group, to the first stacker, and stacks the set of sheets on the second stacker.

Abstract: A sheet processing apparatus has a sheet stacking tray supported for upward and downward movement, a lifting/lowering unit for lifting and lowering the sheet stacking tray, a first sensor for sensing the uppermost surface position of a batch of sheets on the stacking tray and lowering the stacking tray a prescribed amount through the lifting/lowering unit, and a second sensor for sensing that the batch of sheets on the stacking tray is partly drawn out and lifting the stacking tray through the lifting/lowering means to thereby return the stacking tray to a position proper to discharge sheets.

Abstract: A sheet processing apparatus has a tray supported in a vertically movable manner and adapted to support sheets discharged from the main body of the sheet processing apparatus, and an elevate/lower unit for elevating or lowering the tray and having a detector for outputting a detection signal by detecting an uppermost one from among the sheets discharged in succession and stacked on the tray and a controller for controlling the elevate/lower unit so as to lower the tray in response to the detection signal inputted from the detector. The controller, after the input of the detection signal from the detector, if the input of the detection signal is not terminated even after lowering of the tray by a predetermined amount, executes a serial control of lowering the tray until the input of the detection signal is terminated, then elevating the tray until the detection signal is inputted, and lowering the tray until the detection signal is terminated.

Abstract: A sheet transport apparatus has a puncher for punching a hole in a sheet as the sheet is being transported through a transport path, and a transport device for clamping and transporting the sheet, the transport device being disposed downstream of the puncher and having a first rotation member and a second rotation member for pressing the sheet into contact with the first rotation member, the transport device being disposed at a position where a hole punched by the puncher passes through.