| 摘要 |
PROBLEM TO BE SOLVED: To provide a toner supplying roller without causing lateral white stripe failure. SOLUTION: When air supplying pressure required for passing 5 L/min flow amount of air in a flow path from a hole with an opening area of 1.2 mm<SP>2</SP>formed on one point on a periphery in a central position in a lengthwise direction of a pipe to a notched part with width of 15 mm notched over an angle for half the periphery in an exactly opposite position of the hole in a position in the direction of the periphery is called roller ventilation resistance, when roller ventilation resistance when an inner diameter of a pipe 20A is made to be the same as an outer diameter of an elastic layer is uncompressed ventilation resistance P1, and when roller ventilation resistance when the inner diameter of a pipe 20B is made a size which is two times indention amount in a pressed part with a developing roller subtracted from the outer diameter of the elastic layer is compressed ventilation resistance P2, in the toner supplying roller 10, the difference between P1 and P2 is≤5 kPa. COPYRIGHT: (C)2009,JPO&INPIT |
