| 摘要 |
PROBLEM TO BE SOLVED: To prevent toner particles from being stuck and deposited onto a brush roller when the toner particles attached to a developing blade are removed by the brush roller. SOLUTION: The brush roller 3 is constituted of a roller part constituted by flocking semiconductive synthetic resin fiber (resistivity value: 1×103 to 1×108Ω.cm) such as rayon or nylon on a conductive cylinder and a shaft part made of metal, and the same voltage as developing voltage VD is applied to the roller 3 in the midst of developing operation. A reservoir 5 where the roller 3 is immersed in liquid developer in the midst of the developing operation is constituted of a plate metallic member, and the same developing voltage VD as that of the roller 3 is applied to the reservoir 5 together with a brush blade 6 made of metal and always coming in contact with the roller 3. Since the toner particles attached to a developing roller 1 by an inverse developing phenomenon in the midst of printing and removed by the developing blade 2 are electrified to be at the developing voltage VD, they are mostly separated from the roller 3 and dispersed in the liquid developer again, and the toner particles left without being separated are removed by the blade 6.
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