| 摘要 |
PURPOSE: To prevent toner from flowing out, leaking and scattering from the both-end surface part of a first toner carrying roller and a second toner carrying roller in a double developing system. CONSTITUTION: The length of a second toner carrying roller 2 in the longitudinal direction is made to be shorter than the effective length of photoreceptor layer of an image carrier, and the length of the first toner carrying roller in the longitudinal direction is made to be longer than the length of the second toner carrying roller 2 in the longitudinal direction, and the bottom surface 5a of a developing hopper 5 is extended to the lower part of the first toner carrying roller 9, and an end surface seal 8 is provided at the both-end peripheral surface part of the first toner carrying roller 9 which is a non-contact part with the second toner carrying roller 2 so as to cover interstice from the bottom surface 5a to the side plate of the developing hopper 5. |
