Patent ID: 7684740
Filing Date: 2010-03-23
Classification: G03G

Abstract:
1. A belt driving controller, which executes driving control of a belt that is wound around a plurality of sustaining rotation bodies including a driven sustaining rotation body that is rotated together with a movement of the belt and a driving sustaining rotation body that transmits driving force to the belt, comprising: a control unit, which executes the driving control of the belt so that a moving velocity fluctuation of the belt caused by a PLD (pitch line distance) fluctuation in the belt circumference direction becomes small, based on rotation information of rotation angle displacement or rotation angle velocities in two of the sustaining rotation bodies in the plural sustaining rotation bodies, in which two sustaining rotation bodies the diameters thereof are different from each other and/or the degrees to which the PLDs of parts of the belt which wind around the two sustaining rotation bodies influence the belt moving velocity and the rotation angle velocities of the two sustaining rotation bodies are different from each other, wherein the control unit executes the driving control of the belt, by using a process result in which one of two rotation fluctuation information items whose phases are different included in the rotation information of the two sustaining rotation bodies is processed to be small, and wherein the two sustaining rotation bodies are disposed so that a ratio of a belt moving route length between the two sustaining rotation bodies to a belt total circumference length becomes 1 to 2Nb (Nb is an integer), and in the process, an adding process is applied to the two rotation fluctuation information items whose phases are different included in the rotation information of the two sustaining rotation bodies, and in the adding process, rotation fluctuation information to which a delay time which is a time that the belt needs to pass through a distance between the two sustaining rotation bodies on a belt moving route is given and also to which a gain is given based on the degrees of the two sustaining rotation bodies are added to the rotation fluctuation information, and the adding process is repeated by Nb times, and in the adding process, as the gain at an nth adding process, where n represents an integer between 1 and Nb, the 2n−1 power of the gain G of the first adding process is used, and as the delay time of the nth adding process, the 2n−1 times of the delay time of the first adding process is used.