Patent ID: 8998192
Filing Date: 2015-04-07
Classification: B26D,B26F,Y10T

Abstract:
1. A sheet punching device, comprising: a punching unit configured to perform punching on a sheet; a sheet edge detector configured to detect an edge portion of the sheet in parallel with a conveying direction of the sheet; a moving unit configured to move the punching unit and the sheet edge detector each in a direction intersecting the sheet conveying direction; and an entrance sensor, disposed downstream of the sheet edge detector in the conveyance direction of the sheet, configured to detect a leading end and a trailing end of the sheet to perform respective sheet process timings in conjunction with the sheet edge detector, wherein in an operation of detecting an edge portion of a sheet when the punching unit performs the punching on the sheet, the sheet edge detector is moved in a direction towards the sheet from a home position at a given timing without stopping to detect an edge portion of a first sheet, and for second and subsequent sheets, the sheet edge detector is moved in advance to near a sheet edge portion of the second and subsequent sheets with reference to the detected position of the sheet edge of the first sheet as a standby position, at a given time.