Patent ID: 8757617

Claim:
An image forming device comprising: a roller configured to rotate and to convey a sheet in a conveying direction; an image forming unit configured to form an image on the sheet conveyed by the roller; a sensor disposed between the roller and the image forming unit in the conveying direction and configured to detect the sheet; a photosensitive member; a transfer member facing the photosensitive member; and a control device configured to: upon feeding a sheet by the roller, waiting for a sheet feed waiting interval before feeding a next sheet by the roller; determine, using the sensor, a sensed sheet interval between at least two of the fed sheets; determine whether the sensed sheet interval is equal to or greater than a reference value; and in response to determining that the sensed sheet interval is equal to or greater than the reference value, reduce the sheet feed waiting interval for subsequent feeding of at least one sheet, wherein the control device is configured to reset the sheet feeding waiting interval to an initial value when a print operation is finished.