Electrophotographic copying apparatus of wet developing type

摘要

The copying apparatus is of the so-called visual image transfer type, in which a developing solution including toner dispersed in a carrier liquid is used for both developing and cleaning purposes. A cleaning device, having a roller and/or doctor blade, is disposed beneath a rotatable photosensor drum and developing and transfer-printing devices are disposed upstream and downstream, respectively, of the cleaning device with respect to the rotating direction of the drum. The cleaning device is brought into engagement with the drum surface after each transfer-printing has been effected and supplied with developing solution, as a cleanser, from the developing device to easily remove residual toner from the drum surface. A bundle of light focussing glass fibres is used as an exposure optical scanning device in order to make the apparatus into a compact structure. The drum makes two rotations during each copying cycle, with the drum being discharged and cleaned during the second rotation.