| 摘要 |
PROBLEM TO BE SOLVED: To prevent developer from being excessively supplied and to secure the flowability of the developer by providing a sheet member with a long hole having an inclined edge in the rotating direction of the sheet member. SOLUTION: The plural long holes 421 having the inclined edges in the rotating direction A of the rectangular film being the sheet member are formed at the rectangular film. Thus, since the surface area of the rectangular film becomes small, the non-magnetic one-component developer is prevented from being excessively supplied to a supply roller. Besides, the parallelogram long holes are also included in the holes 421 and the holes 421 are symmetrically arranged by making the downstream parts 422 thereof in the rotating direction face the center 423 of the rectangular film in the longitudinal direction. To put it more concretely, the plural parallelogram long holes 421 are arranged at the pitch of 5 to 7 mm at a shaft-side part obtained by leaving 2 to 5 mm from the leading edge of the rectangular film, for example. Besides, the area of the parallelogram hole is about 30 to 60 mm<2> and the inclined angle thereof is about 50 to 65 deg.. |
