Method and apparatus for image forming capable of effectively transferring various kinds of powder
US6542707B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 13, 2001 |
| Grant date | Apr 1, 2003 |
| Priority date | — |
| Expiry date | Nov 13, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S222/01
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A powder pump includes a stator and a rotor. The stator has a through-hole formed with two grooves extended in a stator spiral form. The rotor is rotated inside the through-hole of the stator. The rotor extends in a rotor spiral form such that spaces for accommodating a powder are formed between an outer circumferential surface of the rotor and an inner circumferential surface of the through-hole of the stator. The rotor is rotated to move the spaces and to transfer the powder. A cross-sectional engagement amount formed in the stator. An outer diameter engagement amount is formed in the rotor. When the rotor has a cross-sectional diameter RA millimeters and an outer diameter RB millimeters, and the through-hole of the stator has a least inner diameter SN millimeters and a largest inner diameter SX millimeters, RA, RB, SN, and SX are defined to satisfy formulas ofRA−SN≧0.4 andRB−(SN+SX)/2≧0.4.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.