IMAGE FORMING APPARATUS

摘要

The image forming apparatus has a drive shaft; a drive coupling supported in an axial direction to couple the drive shaft and a flange with play; a taper coupling supported inside the drive coupling with play to hold the drive shaft and the flange; and a pressing member for pressing the taper coupling, which consists of a tip portion having a tapered chuck structure and coming in surface contact with the drive shaft and the flange by the elastic force of the tapered chuck structure and the pressing force of the pressing member, and an axial portion having a cylindrical structure whose outer diameter is smaller than the inner diameter of the drive coupling.

主权项

1. An image forming apparatus which transfers toner images formed on an image bearing member to a transfer target medium, and comprises:
a drive shaft structured to transmit a rotation force to the image bearing member; a drive coupling supported movably in an axial direction of the drive shaft and structured to couple the drive shaft and a flange of the image bearing member with play; a taper coupling supported inside the drive coupling with play and structured to hold the drive shaft and the flange of the image bearing member; a pressing member structured to press the taper coupling in the axial direction of the drive shaft, the taper coupling comprising: a tip portion having a tapered chuck structure and coming in surface contact with the drive shaft and the flange of the image bearing member by an elastic force of the tapered chuck structure and a pressing force of the pressing member; and an axial portion having a cylindrical structure whose outer diameter is smaller than the inner diameter of the drive coupling.