Sheet finisher and image forming system equipped therewith

Abstract

A sheet finisher connected to an image forming apparatus, includes: an aligning unit having an aligning plate which aligns in a primary scanning direction a recording sheet that has been conveyed from the apparatus; and a controller which receives any one of correction information of an image forming position and detection information of a recording sheet edge for each sheet feed tray on a side of the apparatus, and determines an alignment position by referring to any one of the information.

1 . A sheet finisher connected to an image forming apparatus, comprising:
 an aligning unit having an aligning plate which aligns in a primary scanning direction a recording sheet that has been conveyed from the apparatus; and   a controller which receives any one of correction information of an image forming position and detection information of a recording sheet edge for each sheet feed tray on a side of the apparatus from the apparatus, and determines an alignment position by referring to any one of the information.   
   
   
       2 . A sheet finisher connected to an image forming apparatus, comprising:
 an aligning unit having an aligning plate which aligns in a primary scanning direction a recording sheet that has been conveyed from the apparatus; and   a controller which receives any one of correction information of an image forming position for each sheet feed tray and detection information of a recording sheet edge on a side of the apparatus, and determines a standby position of the aligning plate by referring to any one of the information.   
   
   
       3 . The sheet finisher of  claim 1 , wherein when a sheet is outputted from a plurality of sheet feed trays, the controller determines the alignment position by referring to information on a sheet tray which is used most frequently. 
   
   
       4 . The sheet finisher of  claim 1 , wherein the aligning plate comprises two aligning plates which press both edges of the recording sheet in the primary scanning direction that has been conveyed from the apparatus, toward a center position of the sheet from a standby position to align the sheet. 
   
   
       5 . The sheet finisher of  claim 2 , wherein the aligning plate comprises two aligning plates which press both edges of the recording sheet in the primary scanning direction that has been conveyed from the apparatus, toward a center position of the sheet from the standby position to align the sheet. 
   
   
       6 . An image forming system comprising:
 an image forming apparatus which forms an image onto a recording sheet; and   a sheet finisher comprising:   an aligning unit having an aligning plate which aligns in a primary scanning direction a recording sheet that has been conveyed from the apparatus; and   a controller which receives any one of correction information of an image forming position for each sheet feed tray and detection information of a recording sheet edge on a side of the apparatus, and determines an alignment position by referring to any one of the information.   
   
   
       7 . An image forming system comprising:
 an image forming apparatus which forms an image onto a recording sheet; and   a sheet finisher comprising:   an aligning unit having an aligning plate which aligns in a primary scanning direction a recording sheet that has been conveyed from the apparatus; and   a controller which receives any one of correction information of an image forming position for each sheet feed tray and detection information of a recording sheet edge on a side of the apparatus, and determines a standby position of the aligning plate by referring to any one of the information.   
   
   
       8 . The image forming system of  claim 6 , wherein when a sheet is outputted from a plurality of sheet feed trays, the controller determines the alignment position by referring to information on a sheet tray which is used most frequently. 
   
   
       9 . The image forming system of  claim 6 , wherein the aligning plate comprises two aligning plates which press both edges of the recording sheet in the primary scanning direction that has been conveyed from the apparatus, toward a center position of the sheet from the standby position to align the sheet. 
   
   
       10 . The image forming system of  claim 7 , wherein the aligning plate comprises two aligning plates which press both edges of the recording sheet in the primary scanning direction that has been conveyed from the apparatus, toward a center position of the sheet from the standby position to align the sheet.