Patent ID: 7684734
Filing Date: 2010-03-23
Classification: G03G

Abstract:
1. A method for assembling a drum drive unit comprising: disposing a plurality of drums which are separated from each other with a predetermined center distance, said drums carrying a belt body by making the belt body contact outer peripheral surfaces thereof; disposing driving force transmission members respectively on rotary shafts of the plurality of drums coaxially with the rotary shafts, each of the driving force transmission members having the same fluctuations per round in a distance between the center of rotation and the driving force transmission position, the fluctuations forming a cycle of fluctuations; obtaining a rotation angle of the drum when the belt body is made to contact the drum and carried for a distance which is equal to the center distance; calculating a difference in the angle between the rotation angle and 360 degrees; and positioning and assembling each of the driving force transmission members by shifting a certain point in the cycle of fluctuations of the driving force transmission members by the difference in the angle.