Patent ID: 7182336

Claim:
A terminal edge position detecting method for detecting a terminal edge position of a recording sheet in a recording apparatus for recording an image on a recording sheet while the recording sheet is transported in a fixed direction at a predetermined transportation quantity, comprising the steps of: detecting a passage of the terminal edge of the recording sheet and obtaining a detected position of the terminal edge of the recording sheet by a sheet detector which detects the recording sheet by contacting therewith; acquiring a transporting speed of the recording sheet at a time point of the passage of the terminal edge of the recording sheet; computing a detect delay error transportation quantity of the recording sheet which is performed in the fixed direction during a detect delay time defined between an instant that the terminal edge of the recording sheet leaves the sheet detector and an instant that the sheet detector detects the passage of the terminal edge of the recording sheet; and computing the terminal edge position of the recording sheet by correcting the detected position of the terminal edge detected by the sheet detector with the detect delay error transportation quantity.