Screw pump, toner conveying device using the same and toner fill

Details Screw pump, toner conveying device using the same and toner fill Screw pump, toner conveying device using the same and toner fill

1998-07-09

1999-09-14

Grimley, Arthur T.

Electrophotography

Image formation

Development

399258, 399260, 222DIG1, 239 73, 406 55, G03G 1508, B65G 5308

Patent

active

059535679

ABSTRACT:
A screw pump for use in an image forming apparatus for conveying toner has a female screw type stator formed with a double pitch spiral groove in its inner periphery, and a male screw type rotor rotatably received in the stator. Assuming that the rotor has a sectional diameter of RA, and that the stator has a minimum inside diameter of S.MIN, the rotor and stator bite into each other such that a dimensional ratio of RA/S.MIN satisfies a relation of RA/S.MIN.ltoreq.1.04. A toner conveying device using such a screw pump and a toner filling system are also disclosed.

REFERENCES:
patent: 4211506 (1980-07-01), List et al.
patent: 5046666 (1991-09-01), Ono
patent: 5329340 (1994-07-01), Fukuchi et al.
patent: 5561506 (1996-10-01), Kasahara
patent: 5638159 (1997-06-01), Kai et al.

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