Patent Number: 7,043,179

Title: Toner replenishing device with timing control of toner replenishing device

Abstract: 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.

Inventors: Matsumoto; Junichi (Kanagawa, JP), Iwata; Nobuo (Kanagawa, JP), Muramatsu; Satoshi (Tokyo, JP)

Assignee: Ricoh Company, Ltd.

International Classification: G03G 15/08 (20060101)

Expiration Date: 5/09/02018