| 摘要 |
A toner replenishing device having a stable performance without causing variation of the toner suction pressure, even if the toner characteristics vary in a toner vessel in a volume-reducing type toner carrying device. In the toner replenishing device comprising a flexible toner storing vessel, a sucking means for arrying the toner in the toner storing vessel to a prescribed place by a negative pressure, and a substantially airtight toner carrying passage, the toner storing vessel being reduced in volume by sucking the toner, the sucking means is a single-shaft eccentric screw pump, whose operation time is longer than the time for generating a maximum pressure.
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