| 摘要 |
A developing device ( 100 ) according to the present invention is provided with a housing ( 102 ) for holding toner, conveying screws ( 104, 105 ) arranged in the housing ( 2 ) and each including a rotary shaft ( 107 ) and a blade ( 106 ) arranged on the rotary shaft ( 107 ) for conveying the toner from one end of the rotary shaft ( 107 ) toward the other end thereof by the rotation of the rotary shaft ( 107 ), and a developing roller ( 103 ) provided in the housing with a part of the developing roller ( 103 ) being exposed from the housing, and rotatable to obtain the toner conveyed by the conveying screws ( 104, 105 ). The conveying screws ( 104, 105 ) are constructed, for the efficient agitation of the toner, such that toner pressing forces of the blades ( 106 ) differ depending the angle of rotation of the rotary shaft ( 107 ).
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