Sheet conveying apparatus and image forming system

Abstract

According to an embodiment, a sheet conveying apparatus includes a roller conveying mechanism, a sheet conveying sensor, an aligning mechanism, and a conveying controller. The conveying controller causes the paper feed roller of the roller conveying mechanism to be driven to convey the sheet. Furthermore, the conveying controller causes the adjustment roller of the aligning mechanism to be driven on the basis of a detection output of the sheet conveying sensor such that a deviation between the course of the sheet and a predetermined standard course is corrected.

What is claimed is: 
     
         1 . A sheet conveying apparatus, comprising:
 a roller conveying mechanism that conveys a sheet by causing the sheet to come in contact with at least one paper feed roller;   a sheet conveying sensor that detects a course of the sheet conveyed by the roller conveying mechanism;   an aligning mechanism that has at least one adjustment roller, the adjustment roller correcting the course of the sheet, conveying the sheet, and aligning an edge position of the sheet; and   a conveying controller configured to
 cause the paper feed roller of the roller conveying mechanism to be driven to convey the sheet, and 
 cause the adjustment roller of the aligning mechanism to be driven on the basis of a detection output of the sheet conveying sensor such that a deviation between the course of the sheet and a predetermined standard course is corrected. 
   
     
     
         2 . The sheet conveying apparatus according to  claim 1 , wherein
 the adjustment roller includes
 a course correcting roller that corrects the course of the sheet conveyed by the paper feed roller and conveys the sheet, and 
 a resist roller that aligns the edge position of the sheet conveyed by the course correcting roller. 
   
     
     
         3 . The sheet conveying apparatus according to  claim 2 , further comprising:
 a first contact/separate mechanism that selectively switches a state of the course correcting roller between a first state that the course correcting roller presses the sheet and a second state that the course correcting roller does not press the sheet.   
     
     
         4 . The sheet conveying apparatus according to  claim 3 , wherein
 the conveying controller is configured to
 cause the first contact/separate mechanism to switch the state of the course correcting roller to the first state, and 
 cause the first contact/separate mechanism to switch the state of the course correcting roller to the second state after the edge of the sheet conveyed by the course correcting roller in the first state is nipped between the course correcting roller and the resist roller. 
   
     
     
         5 . The sheet conveying apparatus according to  claim 4 , wherein
 the first contact/separate mechanism selectively switches between the first state that the course correcting roller presses the sheet and the second state that the course correcting roller does not press the sheet on the basis of a control signal from the conveying controller.   
     
     
         6 . The sheet conveying apparatus according to  claim 1 , further comprising:
 a second contact/separate mechanism that selectively switches a state of the paper feed roller between a third state that the paper feed roller presses the sheet and a fourth state that the paper feed roller does not press the sheet.   
     
     
         7 . The sheet conveying apparatus according to  claim 6 , wherein
 the conveying controller is configured to
 cause the second contact/separate mechanism to switch the state of the paper feed roller to the third state, and 
 cause the second contact/separate mechanism to switch the state of the paper feed roller to the fourth state after the edge of the sheet conveyed by the paper feed roller in the third state arrives at the aligning mechanism. 
   
     
     
         8 . The sheet conveying apparatus according to  claim 7 , wherein
 the second contact/separate mechanism selectively switches between the third state that the paper feed roller presses the sheet and the fourth state that the paper feed roller does not press the sheet on the basis of the control signal from the conveying controller.   
     
     
         9 . An image forming system, comprising:
 a printer that forms an image on a sheet; and   a sheet conveying apparatus that conveys the sheet to the printer,
 the sheet conveying apparatus including
 a roller conveying mechanism that conveys a sheet by causing the sheet to come in contact with at least one paper feed roller, 
 a sheet conveying sensor that detects a course of the sheet conveyed by the roller conveying mechanism, 
 an aligning mechanism that has at least one adjustment roller, the adjustment roller correcting the course of the sheet, conveying the sheet, and aligning an edge position of the sheet, and 
 a conveying controller configured to
 cause the paper feed roller of the roller conveying mechanism to be driven to convey the sheet, and 
 cause the adjustment roller of the aligning mechanism to be driven on the basis of a detection output of the sheet conveying sensor such that a deviation between the course of the sheet and a predetermined standard course is corrected. 
 
 
   
     
     
         10 . The image forming system according to  claim 9 , wherein
 the adjustment roller includes
 a course correcting roller that corrects the course of the sheet conveyed by the paper feed roller and conveys the sheet, and 
 a resist roller that aligns the edge position of the sheet conveyed by the course correcting roller.