Patent ID: 7871073

Claim:
A sheet conveying device, comprising: a drive source; a drive roller driven by the drive source; a driven roller to press against the drive roller and rotate with the drive roller; an angular velocity detector to detect an angular velocity of the drive roller; a timing estimation unit to estimate a timing when a sheet-type recording medium enters between the drive roller and the driven roller; and a controller to control the drive source based on detection results obtained by the angular velocity detector, the controller including: a feedback control unit to perform feedback control based on data obtained by the angular velocity detector, and a feed-forward control unit to perform feed-forward control based on data obtained by the timing estimation unit, wherein a feed-forward target value stored in the controller is corrected by detected speed variation data, wherein based on the detected speed variation data during the feed-forward control, a feed-forward correction value is obtained through processes of removing offset from detected speed variation data, inversing positive and negative values, and cutting off a part including the speed variation, and wherein the obtained feed-forward correction value is added to the feed-forward target value, thereby correcting the feed-forward target value.