Liquid-development full-color electrophotographic device

摘要

A development section uses a liquid toner as a liquid developer and forms a toner image according to an electric field established between the development section and a photosensitive drum. The toner image is transferred from the photosensitive drum onto an intermediate transfer roller 15 according to an electric field established between the same and the photosensitive drum. The toner image is further transferred from the intermediate transfer roller to an intermediate transfer belt 16 and then transferred to a transfer-and-fixation section, which melt-transfers the toner image onto a printing medium. Photosensitive drums 11-14 are provided so as to correspond to a plurality of colors. Toner images formed on the corresponding photosensitive drums are sequentially transferred and superposed on the intermediate transfer roller. An electric field for transferring a toner image from each of the photosensitive drums to the intermediate transfer roller is established through application, to the corresponding photosensitive drums, of a voltage controlled according to electric characteristics peculiar to a color toner on the photosensitive drums while the intermediate transfer roller is grounded. In order to suppress reverse transfer of a previously transferred toner image from the intermediate transfer roller to a photosensitive drum, a toner cohesion enhancement unit is provided for enhancing the degree of toner cohesion of a toner image transferred onto the intermediate transfer roller.