Sheet conveyance apparatus and image forming apparatus

Abstract

A sheet conveyance apparatus includes a moving unit configured to move a conveyance unit nipping the sheet in the width direction such that in a case where the position of the end of the sheet in the width direction detected by the detection unit is separated from a reference position by an amount which is greater than a first predetermined amount and less than or equal to a second predetermined amount, the moving unit to move the conveyance unit by a third predetermined amount which is less than or equal to the first predetermined amount, and to perform control, in a case where the position of the end of the sheet in the width direction detected by the detection unit is separated from the reference position by an amount which is greater than the second predetermined amount, to perform abnormality processing.

What is claimed is: 
     
         1 . A sheet conveyance apparatus comprising:
 a conveyance unit configured to nip and convey a sheet;   a detection unit configured to detect an end of a sheet in a width direction perpendicular to a sheet conveying direction;   a moving unit configured to move the conveyance unit nipping the sheet in the width direction; and   a control unit configured to control, in a case where the position of the end of the sheet in the width direction detected by the detection unit is separated from a reference position by an amount which is greater than a first predetermined amount and less than or equal to a second predetermined amount, the moving unit to move the conveyance unit by a third predetermined amount which is less than or equal to the first predetermined amount, based on a detection result of the detection unit, and to perform control, in a case where the position of the end of the sheet in the width direction detected by the detection unit is separated from the reference position by an amount which is greater than the second predetermined amount, to perform abnormality processing based on a detection result of the detection unit.   
     
     
         2 . The sheet conveyance apparatus according to claim  1 , wherein the third predetermined amount is the same amount as the first predetermined amount. 
     
     
         3 . The sheet conveyance apparatus according to  claim 1 , wherein the control unit stops driving the conveyance unit as the abnormal processing. 
     
     
         4 . The sheet conveyance apparatus according to  claim 1 , wherein the control unit controls, in the case where the position of the end of the sheet in the width direction detected by the detection unit is separated from the reference position by an amount which is less than or equal to the first predetermined amount, the moving unit to move the conveyance unit by the separated amount. 
     
     
         5 . The sheet conveyance apparatus according to  claim 1 ,
 wherein the third predetermined amount is the same amount as the first predetermined amount, and   wherein the control unit controls, in the case where the position of the end of the sheet in the width direction detected by the detection unit is separated from the reference position by an amount which is less than or equal to the first predetermined amount, the moving unit to move the conveyance unit by the separated amount.   
     
     
         6 . The sheet conveyance apparatus according to claim  1 , wherein the control unit calculates a displacement amount of the position of the end of the sheet in the width direction detected by the detection unit from the reference position, and controls the moving unit based on the calculated displacement. 
     
     
         7 . The sheet conveyance apparatus according to  claim 1 , wherein the control unit displays, in the case where the position of the end of the sheet in the width direction detected by the detection unit is separated from the reference position by an amount which is greater than the first predetermined amount and less than or equal to the second predetermined amount, a warning on a display unit. 
     
     
         8 . The sheet conveyance apparatus according to  claim 1 ,
 wherein the conveyance unit includes a registration roller pair configured to convey a sheet to an image forming unit, and   wherein the reference position is a position to be a reference when the image forming unit forms an image on a sheet.   
     
     
         9 . A sheet conveyance apparatus comprising:
 a conveyance unit configured to nip and convey a sheet;   a detection unit configured to detect an end of a sheet in a width direction perpendicular to a sheet conveying direction;   a moving unit configured to move the conveyance unit nipping the sheet in the width direction; and   a control unit configured to control, in a case where the position of the end of the sheet in the width direction detected by the detection unit is separated from a reference position by an amount which is less than or equal to a first predetermined amount, the moving unit to move the conveyance unit by the separated amount, configured to control, in a case where the position of the end of the sheet in the width direction detected by the detection unit is separated from the reference position by an amount which is greater than the first predetermined amount and less than or equal to a second predetermined amount, the moving unit to move the conveyance unit by the first predetermined amount, and configured to perform control, in a case where the position of the end of the sheet in the width direction detected by the detection unit is separated from the reference position by an amount which is greater than the second predetermined amount, to stop driving the conveyance unit, based on a detection result of the detection unit.   
     
     
         10 . The sheet conveyance apparatus according to  claim 9 , wherein the control unit calculates a displacement amount of the position of the end of the sheet in the width direction detected by the detection unit from the reference position, and controls the moving unit based on the calculated displacement. 
     
     
         11 . The sheet conveyance apparatus according to  claim 9 , wherein the control unit displays, in the case where the position of the end of the sheet in the width direction detected by the detection unit is separated from the reference position by an amount which is greater than the first predetermined amount and less than or equal to the second predetermined amount, a warning on a display unit. 
     
     
         12 . The sheet conveyance apparatus according to  claim 1 ,
 wherein the conveyance unit includes a registration roller pair configured to convey a sheet to an image forming unit, and   wherein the reference position is a position to be a reference when the image forming unit forms an image on a sheet.   
     
     
         13 . An image forming apparatus comprising:
 a conveyance unit configured to nip and convey a sheet;   an image forming unit configured to form an image on the sheet conveyed by the conveyance unit;   a detection unit configured to detect an end of a sheet in a width direction perpendicular to a sheet conveying direction;   a moving unit configured to move the conveyance unit nipping the sheet in the width direction; and   a control unit configured to control, in a case where the position of the end of the sheet in the width direction detected by the detection unit is separated from a reference position by an amount which is greater than a first predetermined amount and less than or equal to a second predetermined amount, the moving unit to move the conveyance unit by a third predetermined amount which is less than or equal to the first predetermined amount, based on a detection result of the detection unit, and configured to perform control, in a case where the position of the end of the sheet in the width direction detected by the detection unit is separated from the reference position by an amount which is greater than the second predetermined amount, to perform abnormality processing based on a detection result of the detection unit.