Sheet post-processing apparatus

Abstract

[Problem]A sheet bundle can be stacked with no displacement, a stacking property of the sheet bundle is improved, and sheet receiving time is shortened, which allows improvement of productivity. [Solving Means]A sheet post-processing apparatus 1 includes sheet conveying means 10 for conveying a sheet 100 discharged by an image forming apparatus to a stacking tray 3 , jogger and stack means 30 including a pair of left and right joggers 31 that stacks the sheet 100 discharged by the sheet conveying means 10 while supporting and jogging the sheet 100 , and a support 20 that is able to be progressed and retreated, and supports a rear end portion of the sheet 100 discharged by the sheet conveying means 10 at a progressing position. In the sheet post-processing apparatus 1 , the jogger and stack means 30 is arranged above the stacking tray 3 , the support 20 is arranged between the stacking tray 3 and the jogger and stack means 30 , the sheet 100 discharged by the sheet conveying means 10 is supported by the pair of left and right joggers 31 , the rear end portion of the sheet 100 is placed on and jogged by the support 20 located at the progressing position to form a sheet bundle 110 , the pair of left and right joggers 31 is opened to drop the jogged sheet bundle 110 on the stacking tray 3 , the support 20 is retreated, and the rear end portion of the sheet bundle 110 placed on the support 20 is dropped and stacked on the stacking tray 3.

1 . A sheet post-processing apparatus comprising:
 sheet conveying means for conveying a sheet discharged by an image forming apparatus to a stacking tray;   jogger and stack means including a pair of left and right joggers that stacks the sheet discharged by the sheet conveying means while supporting and jogging the sheet; and   a support that is able to be progressed and retreated, and supports a rear end portion of the sheet discharged by the sheet conveying means at a progressing position,   wherein the jogger and stack means is arranged above the stacking tray,   the support is arranged between the stacking tray and the jogger and stack means,   the sheet discharged by the sheet conveying means is supported by the pair of left and right joggers, the rear end portion of the sheet is placed on and jogged by the support located at the progressing position to form a sheet bundle,   the pair of left and right joggers is opened to drop the jogged sheet bundle on the stacking tray, and   the support is retreated to drop and stack the rear end portion of the sheet bundle placed on the support on the stacking tray.   
     
     
         2 . The sheet post-processing apparatus according to  claim 1 , wherein the support supports an inside in a width direction of the rear end portion of the sheet. 
     
     
         3 . The sheet post-processing apparatus according to  claim 1 , wherein the pair of left and right joggers supports and jogs a leading end side portion and a leading end bottom portion of the sheet discharged by the sheet conveying means, and
 the pair of left and right joggers is opened to drop a leading end side of the jogged sheet bundle on the stacking tray.   
     
     
         4 . The sheet post-processing apparatus according to  claim 1 , wherein the pair of left and right joggers is horizontally movable with respect to a sheet discharge center position,
 operation to move the sheet bundle in one of the horizontal directions while the sheet bundle is jogged at the sheet discharge center position, open the pair of left and right joggers at a stacking position, and retreat the support to drop and stack the sheet bundle on the stacking tray, and   operation to move the sheet bundle in the other of the horizontal directions while the sheet bundle is jogged at the sheet discharge center position, open the pair of left and right joggers at the stacking position, and retreat the support to drop and stack the sheet bundle on the stacking tray are repeated, and   the sheet bundle is stacked on the stacking tray while alternately displaced.   
     
     
         5 . The sheet post-processing apparatus according to  claim 1 , wherein the pair of left and right joggers is horizontally movable with respect to a sheet discharge center position,
 operation to move the sheet bundle in one of the horizontal directions while the sheet bundle is jogged at the sheet discharge center position, open the pair of left and right joggers at the stacking position, and retreat the support to drop and stack the sheet bundle on the stacking tray is repeated, and   the sheet bundle is stacked on the stacking tray while not alternately displaced.   
     
     
         6 . The sheet post-processing apparatus according to  claim 1 , further comprising stapling means for stapling the sheet bundle jogged by the pair of left and right joggers,
 wherein the pair of left and right joggers is opened to drop the leading end side of the sheet bundle stapled by the stapling means on the stacking tray, only the rear end portion of the sheet bundle is placed on the support, and   the support is retreated to drop and stack the rear end portion the sheet bundle placed on the support on the stacking tray.   
     
     
         7 . The sheet post-processing apparatus according to  claim 6 , wherein the pair of left and right joggers is horizontally movable with respect to a sheet discharge center position,
 operation to move the sheet bundle in one of the horizontal directions while the sheet bundle is jogged at the sheet discharge center position, and staple the sheet bundle at a stapling position using the stapling means,   operation to move and open the pair of left and right joggers at one of stacking positions, and retreat the support to drop and stack the sheet bundle on the stacking tray,   operation to move the sheet bundle in one of the horizontal directions while the sheet bundle is jogged at the sheet discharge center position, and staple the sheet bundle at a stapling position using the stapling means, and   operation to move and open the pair of left and right joggers at the other of stacking positions, and retreat the support to drop and stack the sheet bundle on the stacking tray are repeated, and   the sheet bundle is stacked on the stacking tray while alternately displaced.   
     
     
         8 . The sheet post-processing apparatus according to  claim 6 , wherein the pair of left and right joggers is horizontally movable with respect to a sheet discharge center position,
 operation to move the sheet bundle only in one of the horizontal directions while the sheet bundle is jogged at a sheet discharge center position, and staple the sheet bundle at a stapling position using the stapling means, and   operation to move and open the pair of left and right joggers at one of stacking positions, and retreat the support to drop and stack the sheet bundle on the stacking tray are repeated, and   the sheet bundle is stacked on the stacking tray while not alternately displaced.   
     
     
         9 . The sheet post-processing apparatus according to  claim 6 , wherein a sheet bundle holder is arranged at a position where the sheet bundle jogged by the pair of left and right joggers is stapled, and
 the sheet bundle holder acts as a holding member for the sheet bundle to be stapled, and as a cover covering the stapling means.   
     
     
         10 . The sheet post-processing apparatus according to  claim 1 , wherein the sheet post-processing apparatus is arranged above the image forming apparatus, and
 the sheet conveying means conveys the sheet sent from an upper portion of the image forming apparatus to the stacking tray.