Minolta Company, Ltd.

Masato Yasui

Kazunobu Maekawa

Kuniaki Ishiguro

Seiichi Munemori

An image forming apparatus equipped with a monochrome mode and color mode, in which the transfer drum is made to rotate without any paper wrapped around it to clean the transfer drum each time a series of copy operations is completed. By controlling the cleaning period through increasing or decreasing the number of non-paper rotations in response to the last copy operation mode, the transfer drum may be adequately cleaned at all times, and the amount of wear on the transfer drum and cleaning device caused by the cleaning operation is reduced.

Image forming apparatus equipped with cleaning device

The present invention relates to an image forming apparatus having a first forming device forming a first toner image on a first surface of a sheet, a second forming device forming a second toner image on a second surface of the sheet, a detecting device detecting the amount of adhered toner on the first surface of the sheet, a setting device setting an forming output according to the amount of adhered toner detected by detecting device, and inputting device inputting the forming output to the second forming device in order to form the second toner image by the settled forming output. The object of the present invention is to provide a reliable image forming.

Transfer device and image forming apparatus using said transfer device

The invention relates a sheet separation apparatus including a sheet carrying member which is capable of holding a sheet thereon, a device positioning a sheet on the surface of the sheet carrying member, a device separating the held sheet from the sheet carrying member by predetermined sheet separating power, said separating means capable of changing the sheet separating power, and a device selecting sheet separating power of the separating device according with the surface of the sheet positioned by the positioning device. The object of the invention is to provide a reliable separation of the sheet from said sheet carrying member.

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Toyokawa, Japan

Masato Yasui