BELT CONVEYING DEVICE, IMAGE FORMING APPARATUS, AND ADJUSTMENT METHOD OF BELT SKEW CONTROLLER IN BELT CONVEYING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a belt conveying device capable of stabilizing the skew control of an endless belt without relying on the coefficient of friction of a drive roller by a simple structure and an image forming apparatus.;SOLUTION: A belt conveying device includes: at least three rollers 11, 12, 13, about which an endless belt to convey an object, is entrained, including an oscillation roller 12 having a rotation shaft, whose one end is fixed and the other end is oscillatably supported; an oscillator oscillating the oscillation roller 12; a belt detection sensor provided adjacent to a side edge of the belt, which detects presence of the be and a belt skew controller which controls the oscillator to oscillate the oscillation roller according to a preset control value in a predetermined range to correct skew. The oscillator moves a rotation center y of a movable edge of the oscillation roller 12 along a tangential line OT of an ellipse O having elliptical focuses corresponding to rotation centers x, z of rotation shafts of the two rollers 11, 12 other than the oscillation roller, positioned respectively in upstream and downstream of and adjacent to the oscillation roller 12 in a belt conveyance direction.;COPYRIGHT: (C)2008,JPO&INPIT