| 摘要 |
PROBLEM TO BE SOLVED: To prevent the variable density of an image from being generated by constituting the opposite part to the head of a roller of an easily deformable material when an outer force is inflicted and keeping the roller distant as specified from a hole using the end part of a spacer which keeps an end part in close proximity to the upstream side of the hole, in contact with the roller, between the roller and the head. SOLUTION: A sleeve 12 is formed of a thin film made of a conductive material and has an inside dia. slightly larger than the outside dia. of a drive roller 13. In addition, in a part of a partition 26 formed of a non-conductive material and in a region where the sleeve 12 are opposed to a back electrode roller 20, plural circular through holes 34 are formed at a specified interval in a line in parallel with the center axis of the drive roller 13. Further, a spacer 50 is arranged in an upstream direction to the rotating direction of the drive roller 13 (and the sleeve 12) and the end part of the spacer 50 is in contact lightly with the sleeve 12. The base between the through hole 34 of the partition 26 and the outer periphery of the sleeve 12 opposed to the former is equal regardless of positions such as both end parts of the sleeve 12 or its center part. |
