Patent ID: 7606516
Filing Date: 2009-10-20
Classification: G03G

Abstract:
1. An image printing apparatus, comprising: a control unit which controls a rotational speed of an image carrier; a detecting unit which detects data of the rotational speed; a storage unit which stores the rotational speeds up to n past rotation cycles of the image carrier; a determining unit which determines whether a rotational speed difference between a latest rotational speed in a current rotation cycle and a rotational speed in the n past rotation cycle before the current rotation cycle at a predetermined interval, which includes a same rotational position in respective rotation cycles and its near position, is more than a predetermined reference value; and a real time control unit which controls the rotational speed of the image carrier by feeding back the rotational speed of the image carrier in real time, wherein the control unit controls the rotational speed of the image carrier by using the data of the rotational speeds at the predetermined interval including the same rotational position in one or n past rotation cycles before the current rotation cycle, and further the control unit controls a rotational speed in a subsequent rotation cycle next to the current rotation cycle in accordance with a determination result obtained by the determining unit, and wherein when the determining unit determines that the rotational speed difference is more than the predetermined reference value, the control unit performs a rotational speed control by making use of a feedback control by the real time control unit without performing repetitive rotational speed control, which controls the rotational speed of the image carrier by using the data of the rotational speeds at the predetermined interval including the same rotational position in one or n past rotation cycles before the current rotation cycle.