Mita Industrial Co., Ltd.

Tohru Ueno

Toshiyuki Fukami

Hiroshi Mishima

Yuji Tanaka

Hiroki Morishita

Eiichi Miyamoto

Yoshifumi Okauchi

Nariaki Tanaka

Tetsuro Tomoe

Hiroaki Iwasaki

Keizo Kimoto

Ichiro Yamazato

An image-forming apparatus using a rubber blade having a rubber hardness of not smaller than 73.degree. for cleaning the residual toner on the photosensitive material drum, wherein a maximum rotational deviation r (mm) of said photosensitive material drum satisfies the following formula,

Image-forming apparatus including a photosensitive material drum and a

This invention relates to an image forming apparatus in which a cleaning device is arranged above a photosensitive drum close thereto. The image forming apparatus has an image processing unit provided with the photosensitive drum. The photosensitive drum is constructed such that a gear portion formed in a flange member at one axial end of the photosensitive drum has a diameter not greater than an outer diameter of the photosensitive drum. The image processing unit is constructed such that a driving force from the image forming apparatus is transmitted to the photosensitive drum via the gear portion formed in the one flange member to rotate the photosensitive drum and is transmitted to at least one of image processor means via a gear portion formed in a flange member at the opposite axial end of the photosensitive drum. With this arrangement, a poor image formation due to a blocking phenomenon resulting from long stay of toner residues can be prevented and downsizing of the image forming apparatus is realized.

Photosensitive drum and image processing unit

The photosensitive material of the present invention is provided in contact with a developing roller and has a surface potential decay characteristic in which when the photosensitive material is charged to a surface potential of 800 V and is contacted with the developing roller to which a voltage (VR) is applied, the surface potential (VD) of the photosensitive material after contacting is represented by the formula (1):

Electrophotographic photosensitive material

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Osaka, Japan

Tohru Ueno