Ricoh Company, Ltd.

Masatoshi Saitou

Hidenori Tomono

Hiromichi Komai

Toshio Kawakubo

Tohru Maruyama

Eriko Chiba

Tomoaki Sugawara

Masaru Shinkai

Sotohiro Tsujihara

Tarou Terashi

Tsutomu Sato

Yutaka Ebi

Masao Yoshikawa

Fuyuhiko Matsumoto

Tsutomu Ishida

Kunihiko Ikeda

Shuichi Tsushima

Shuichi Karasawa

An image forming substance removing apparatus for preventing an unstabilizing liquid from being excessively applied to a sheet material unnecessarily, preventing a bad state of transporting the sheet material, and not requiring a long time for drying the sheet material is provided. In the above-mentioned apparatus, an unstabilizing liquid supplying unit applies the unstabilizing liquid to the transfer material and is constructed with an applying roller for pumping up the unstabilizing liquid by an action of its rotation, a restriction roller for bringing the applying roller into contact with the transfer paper, and others. And further, in order to move the restriction roller between a position of coming into contact with the applying roller and a position of departing therefrom, a tip end sensor for sensing the tip end of the transfer paper, a spring, and a solenoid, etc. are provided in the apparatus.

Liquid applying apparatus and an image forming substance removing

In a toner removing apparatus in which, after toner attached to transferring paper is heated and adheres to a peeling-off belt, transferring paper is separated from the belt and thereby toner is peeled off from transferring paper, the peeling-off belt is cooled by a cooling fan and thereafter toner is removed therefrom. The transferring paper is tightly attached to the peeling-off belt, and a cleaning fan is provided so as to oppose to the peeling-off belt passing through the pressurizing portions of upper and lower heating rollers for heating the belt and moving to the cleaning portion in the belt cleaning apparatus. The temperature of toner is lowered in order to harden toner to an extent that the condensation of the image forming substance sticking on the peeling-off belt turns out to be larger than the sticking force between the image forming substance and the peeling-off belt member.

Method of and an apparatus for removing image forming substance from an

A copying method for producing duplicates of an original of at least two colors by using a composite photosensitive member including more than two photosensitive layers, wherein the photosensitive member is subjected to charging more than twice and exposed to an optical image of the original more than once by changing charging and exposing conditions, to vary charge carried on the surface and in the interior of the photosensitive member. This causes two types of electrostatic image to be formed on the surface of the photosensitive member; one type includes image regions having a positive surface potential, a negative surface potential and a substantially zero surface potential respectively and the other type includes two image regions having different surface potentials of same polarity respectively, and one image regions of substantially zero surface potential, depending on differences in color between image regions of the original corresponding to the image regions on the photosensitive member. By suitably selecting charging and exposing conditions, it is possible to selectively carry out, by using a single copying apparatus, a copying mode in which duplicates are produced in several colors, a copying mode in which duplicates are produced in one color and a copying mode in which image regions of one color are erased.

Copying method and apparatus

An electrostatic charge is applied to a dielectric peripheral surface of a transfer drum and a copy sheet is fed between the transfer drum and a photoconductive drum to transfer a toner image from the photoconductive drum to the copy sheet. The drums rotate at the same surface speed and in the same direction at adjacent portions thereof. The surface speed is maintained at a first value for a first toner transfer operation and then changed to a second value for a subsequent toner transfer operation. A voltage sensor in combination with a variable voltage source adjusts the value of the electrostatic charge on the transfer drum to a predetermined value at either surface speed.

Electrostatic copying apparatus

Growing community of inventors

Machida, Japan

Masatoshi Saitou