Sheet conveyance apparatus, image reading apparatus, and image forming apparatus

Abstract

A sheet conveyance apparatus includes a stacking portion, a feeding portion, first and second detection units, a controller, and a setting unit. The feeding portion separates and feeds sheets stacked on the stacking portion. Of a sheet fed by the feeding portion, the first detection unit detects skewing, and the second detection unit detects flip-up. The controller stops feeding where skewing of the sheet is detected by the first detection unit and where flip-up of the sheet is detected by the second detection unit. The setting unit sets a different-width mixed document mode in which a plurality of sheets having different widths is stacked on the stacking portion. In a case where the different-width mixed document mode is set by the setting unit, the controller does not stop feeding based on skewing detected by the first detection unit but stops feeding based on flip-up detected by the second detection unit.

What is claimed is: 
     
         1 . A sheet conveyance apparatus comprising:
 a stacking portion on which sheets are to be stacked;   a feeding portion configured to separate and feed the sheets stacked on the stacking portion one by one;   a first detection unit configured to detect skewing of the sheet fed by the feeding portion;   a second detection unit configured to detect flip-up of the sheet fed by the feeding portion;   a controller configured to stop feeding executed by the feeding portion in a case where skewing of the sheet is detected by the first detection unit and in a case where flip-up of the sheet is detected by the second detection unit; and   a setting unit configured to set a different-width mixed document mode in which a plurality of sheets having different widths is stacked on the stacking portion,   wherein, in a case where the different-width mixed document mode is set by the setting unit, the controller does not stop feeding based on skewing detected by the first detection unit but stops feeding based on flip-up detected by the second detection unit.   
     
     
         2 . The sheet conveyance apparatus according to  claim 1 ,
 wherein the first detection unit includes a first sensor that is for detecting the sheet fed by the feeding portion and a second sensor that is for detecting the sheet fed by the feeding portion and is arranged next to the first sensor in a width direction, and   wherein the controller stops feeding executed by the feeding portion in a case where any one of the first sensor or the second sensor does not detect a sheet before a prescribed period of time elapses since the other one of the first sensor or the second sensor detected the sheet.   
     
     
         3 . The sheet conveyance apparatus according to  claim 2 , wherein the controller starts feeding of a subsequent sheet which follows a preceding sheet when a trailing edge of the preceding sheet is detected by the second sensor. 
     
     
         4 . The sheet conveyance apparatus according to  claim 1 ,
 wherein the second detection unit includes a light emitting portion and a light receiving portion arranged above the stacking portion, and   wherein the controller stops feeding executed by the feeding portion in a case where a light path from the light emitting portion to the light receiving portion is intercepted by a sheet after feeding is started by the feeding portion.   
     
     
         5 . The sheet conveyance apparatus according to  claim 1 ,
 wherein the setting unit is capable of setting the different-width mixed document mode and a same-width mixed document mode in which plural sheets having the same widths and different lengths in a conveyance direction is stacked on the stacking portion, and   wherein, in a case where the same-width mixed document mode is set by the setting unit, the controller stops both of the feeding based on skewing detected by the first detection unit and the feeding based on flip-up detected by the second detection unit.   
     
     
         6 . The sheet conveyance apparatus according to  claim 1 , further comprising a display portion configured to display a message
 wherein, in a case where skewing is detected by the first detection unit and in a case where flip-up is detected by the second detection unit, the display portion displays a message indicating that the sheets stacked on the stacking portion are likely to be bound documents.   
     
     
         7 . A sheet conveyance apparatus comprising:
 a stacking portion on which sheets are to be stacked;   a feeding portion configured to separate and feed the sheets stacked on the stacking portion one by one;   a first detection unit configured to detect skewing of the sheet fed by the feeding portion;   a second detection unit configured to detect flip-up of the sheet fed by the feeding portion;   a controller configured to determine that the sheets stacked on the stacking portion are bound documents in a case where skewing of the sheet is detected by the first detection unit and in a case where flip-up of the sheet is detected by the second detection unit; and   a setting unit configured to set a different-width mixed document mode in which a plurality of sheets having different widths is stacked on the stacking portion,   wherein, in a case where the different-width mixed document mode is set by the setting unit, the controller does not execute determination of bound documents based on skewing detected by the first detection unit but executes determination of bound documents based on flip-up detected by the second detection unit.   
     
     
         8 . A sheet conveyance apparatus comprising:
 a stacking portion on which sheets are to be stacked;   a feeding portion configured to separate and feed the sheets stacked on the stacking portion one by one;   a first detection unit which includes a first sensor that is for detecting the sheet fed by the feeding portion and a second sensor that is for detecting the sheet fed by the feeding portion and is arranged next to the first sensor in a width direction;   a second detection unit which includes a light emitting portion and a light receiving portion arranged above the stacking portion;   a controller configured to stop feeding executed by the feeding portion in a case where any one of the first sensor or the second sensor does not detect a sheet before a prescribed period of time elapses since the other one of the first sensor or the second sensor detected the sheet and in a case where a light path from the light emitting portion to the light receiving portion is intercepted by a sheet; and   a setting unit configured to set a different-width mixed document mode in which a plurality of sheets having different widths is stacked on the stacking portion,   wherein, in a case where the different-width mixed document mode is set by the setting unit, the controller does not stop feeding based on a detection result by the first detection unit but stops feeding based on a detection result by the second detection unit.   
     
     
         9 . A sheet conveyance apparatus comprising:
 a stacking portion on which sheets are to be stacked;   a feeding portion configured to separate and feed the sheets stacked on the stacking portion one by one;   a first detection unit configured to detect skewing of the sheet fed by the feeding portion;   a second detection unit configured to detect flip-up of the sheet fed by the feeding portion;   a controller configured to stop feeding executed by the feeding portion in a case where skewing of the sheet is detected by the first detection unit and in a case where flip-up of the sheet is detected by the second detection unit; and   a setting unit configured to set a first setting for enabling or disabling detection of skewing of a sheet executed by the first detection unit and a second setting for enabling or disabling detection of flip-up of a sheet executed by the second detection unit.   
     
     
         10 . An image reading apparatus comprising:
 the sheet conveyance apparatus according to  claim 1 ; and   a reading unit configured to read images of sheets conveyed by the sheet conveyance apparatus.   
     
     
         11 . An image forming apparatus comprising:
 an image reading apparatus having the sheet conveyance apparatus according to  claim 1 , and having a reading unit configured to read images of sheets conveyed by the sheet conveyance apparatus; and   an image forming unit configured to form images on a recording material based on image information of a sheet read by the image reading apparatus.