DEVIATION CORRECTING METHOD OF CONVEYOR BELT OF BELT DRIVING DEVICE

PROBLEM TO BE SOLVED: To stably travel a belt for a short time at the time of a first use starting by fixing and mounting a belt driving device provided with a deviation control mechanism to a printer, etc. such that a deviation control roller is approximately parallel to the other roller and releasing the fixing when the belt driving device is operated. SOLUTION: A shaft end portion 3a is fixed between a side wall of a cut-in portion of support member 6 and a pinion 33 by attaching a fixing tool 60 such that a deviation control roller is positioned in approximately parallel to a driving roller and a tension roller. This is assembled to a printer as such and this fixing tool 60 is removed prior to firstly using the printer. At the time of first use, a time until a flat belt repeats a reciprocation deviation to a width direction to obtain a stable traveling is shortened as compared with the case where a deviation detection member attached to a movable shaft end portion 3a of the deviation control roller is positioned at a position deviated from an equilibrium position. When the stable traveling is obtained, a deviation control of the flat belt is carried out from the position at the time of next use by engaging a rack with the pinion 33.