Sheet processing apparatus

Abstract

A sheet processing apparatus includes an aligning member and a shift conveying unit. The aligning member is movable in a width direction perpendicular to a sheet conveying direction and presses a sheet stack loaded on a sheet processing tray so as to align the sheet stack in the width direction. The unit is provided on the upstream side of the tray and conveys a sheet, shifting the sheet in the width direction. Being shifted by the unit, sheets are loaded at first and second loading positions on the tray. When sheets are loaded at the first loading position, the aligning member is moved to a first standby position corresponding to the first loading position in advance. When sheets are loaded at the second loading position, the aligning member is moved in advance to a second standby position corresponding to the second loading position.

What is claimed is: 
     
       1. An apparatus comprising:
 a shift conveying unit that conveys a sheet in a sheet conveying direction and shifts the sheet in a width direction perpendicular to the sheet conveying direction; 
 a sheet tray on which sheets shifted by the shift conveying unit are loaded at a first loading position and a second loading position that is offset from the first loading position in the width direction; and 
 an aligning member that aligns the sheet stacked on the sheet tray in the width direction, the aligning member is movable between a first position corresponding to the first loading position and a second position corresponding to the second loading position in the width direction, 
 wherein the aligning member is moved at a first position corresponding to the first loading position and thereafter aligns the sheets loaded on the sheet tray at the first loading position in the case that the sheets are loaded at the first loading position, and 
 wherein the aligning member is moved at to the second position corresponding to and thereafter aligns the sheets loaded on the sheet tray at the second loading position in the case that the sheets and aligned are loaded at the second loading position. 
 
     
     
       2. An apparatus according to  claim 1 , further comprising a position detecting unit that detects a position of the sheet in the width direction, wherein the shift conveying unit shifts the sheet in the width direction according to the position of sheet detected by the detecting sensor position detecting unit. 
     
     
       3. An apparatus according to  claim 2 , wherein the position detecting unit detects an end edge parallel to the conveying direction of the sheet. 
     
     
       4. An apparatus according to  claim 1 , wherein a shift distance of the sheet by the shift conveying unit is set according to sheet size. 
     
     
       5. An apparatus according to  claim 1 , wherein the aligning member aligns sheets by moving from a standby the first position every time the sheets are loaded onto the sheet tray in the case that the sheets are loaded at the first loading position, and the aligning member aligns the sheets by moving from the second position every time the sheets are loaded onto the sheet tray in the case that the sheets are loaded at the second loading position. 
     
     
       6. An apparatus according to claim 1, further comprising:
 a discharging member that discharges the sheets aligned by the aligning member; and   a discharging tray on which sheets discharged by the discharge member are loaded.    
     
     
       7. An apparatus, comprising:
 a shift conveying unit that conveys a sheet in a sheet conveying direction and shifts the sheet in a width direction perpendicular to the sheet conveying direction;   a sheet tray on which sheets shifted by the shift conveying unit are loaded at a first loading position and a second loading position that is offset from the first loading position in the width direction; and   an aligning member that aligns the sheet stacked on the sheet tray in the width direction, the aligning member is movable between a first position corresponding to the first loading position and a second position corresponding to the second loading position in the width direction,   wherein the aligning member aligns the sheet, loaded at the first loading position, at the first position in the case that the sheets are loaded at the first loading position, and   wherein the aligning member aligns the sheet, loaded at the second loading position, at the second position in the case that the sheets are loaded at the second loading position.    
     
     
       8. An apparatus according to claim 7, further comprising a position detecting unit that detects a position of the sheet in the width direction, wherein the shift conveying unit shifts the sheet in the width direction according to the position of sheet detected by the position detecting unit.  
     
     
       9. An apparatus according to claim 8, wherein the position detecting unit detects an end edge parallel to the conveying direction of the sheet.  
     
     
       10. An apparatus according to claim 7, wherein a shift distance of the sheet by the shift conveying unit is set according to sheet size.  
     
     
       11. An apparatus according to claim 7, wherein the aligning member aligns sheets by moving from the first position every time the sheets are loaded onto the sheet tray in the case that the sheets are loaded at the first loading position, and the aligning member aligns the sheets by moving from the second position every time the sheets are loaded onto the sheet tray in the case that the sheets are loaded at the second loading position.  
     
     
       12. An apparatus according to claim 7, further comprising:
 a discharging member that discharges the sheets aligned by the aligning member; and   a discharging tray on which sheets discharged by the discharge member are loaded.