| 摘要 |
PROBLEM TO BE SOLVED: To improve the positional accuracy of a transfer means. SOLUTION: The twist direction of the projection part 22 of a drum flange 21 fixed at the end part of a photoreceptor drum 11 is made to be the same as that of a transfer roller driving gear 24. In this case, the projection part 22 is a triangular pole twisted in an axial direction, the projection part 22 is drawn into the twisted recessed part of a driving shaft(not shown in figure) of the device main body by thrust (in a direction shown by an arrow A) arising at rotating. The gear 24 is a helical gear. Since thrust by the tooth load of the transfer roller gear 25 attached to the transfer roller 9 works in a direction shown by an arrow C, the transfer roller 9 comes into a thrust check 29, then, the axial position of the roller 9 is fixed. |
