Patent ID: 8764007

Claim:
A sheet conveying device comprising: first and second detection sensors that are disposed in a direction crosswise to a conveying direction for conveying an index tab sheet having an index tab, for detecting the index tab sheet; an acquiring unit configured to acquire a size of the index tab; first and second conveying units that are disposed in a direction crosswise to the conveying direction, for conveying the index tab sheet; a timer configured to measure a leading edge detection time from when one of the first or second detection sensor detects a leading edge of the index tab sheet to thereby output a first signal to when the other of the first or second detection sensor detects the leading edge of the index tab sheet to thereby output a second signal; and a skew correction unit configured to control respective conveying speeds of the first and second conveying units independently of each other so that a skew corresponding to the leading edge detection time is corrected, wherein, in a case where the index tab sheet is conveyed, when the leading edge detection time measured by the timer is not smaller than a predetermined threshold value since one of the first or second detection sensor detects the index tab of the index tab sheet, the skew correction unit determines a skew correction amount based on the measured leading edge detection time and size of the index tab acquired by the acquiring unit, and wherein when the leading edge detection time measured by the timer is smaller than the predetermined threshold value since both the first and second detection sensors do not detect the index tab, the skew correction unit determines the skew correction amount based on the measured leading edge detection time, regardless of the size of the index tab.