Screw pump, toner conveying device using the same and toner filling system
US5953567A · kind A · utility
78Cited by
5References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 9, 1998 |
| Grant date | Sep 14, 1999 |
| Priority date | — |
| Expiry date | Jul 9, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S222/01
- WIPO fieldOptics
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.