Patent ID: 7802781
Filing Date: 2010-09-28
Classification: B26D,B26F,B65H,G03G,Y10T

Abstract:
1. A sheet processing apparatus comprising: a conveying motor for conveying a sheet along a conveying path; a skew detecting unit configured to detect a quantity of skew at a forward edge and a rear edge of the sheet conveyed along the conveying path; a hole punching section arranged downstream from the skew detecting unit and orthogonally to the conveying path of the sheet and configured to perform punching processing to the conveyed sheet; an attitude control unit configured to carry out skew correction by changing tilt angle of the hole punching section in accordance with the quantity of skew detected by the skew detecting unit; a first detecting unit configured to detect the forward edge and the rear edge of the sheet conveyed into the hole punching section; and a control unit configured to control the conveying motor to control the conveying speed of the sheet, and to control the skew correction and the punching processing to the sheet in accordance with the conveying of the sheet; wherein during a period from when the first detecting unit detects the forward edge of the sheet until the first detecting unit detects the rear edge, the control unit decelerates the sheet from a first conveying speed to a second conveying speed, and after the first detecting unit detects the rear edge of the sheet, the control unit stops the conveying of the sheet and executes the punching processing to the sheet when the conveying is stopped.