US4297969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic powder transporting device
Assignee: Canon Inc
•
Filing: 1979-10-30
•
Granted: 1981-11-03
•
Expires: 1999-10-30
Abstract
Abstract A magnetic powder transporting device for use in a developing or cleaning unit in an image forming apparatus such as an electrophotographic copier or magnetic printer. A magnet functioning as the transporting means is provided at the ends thereof with magnetic field generating portions for magnetically displacing the magnetic powder toward the inner position. Said magnetic field generating portions are formed by inclined end portions of main magnetic poles or by auxiliary magnetic poles separate from said main magnetic poles.
Inventors
- 👤 Akiyoshi Torigai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:16
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/09; G03G15/0921; G03G21/00; G03G21/10; G03G21/105
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
100 words
A transporting device for transporting magnetic powder with magnetic force, comprising: transport means provided with a magnet having principal magnetic poles for transporting the magnetic powder; and drive means for driving said transport means, wherein said magnet has magnetic field generating portions provided at the end portions thereof for displacing the magnetic powder toward the internal portions of the magnet by magnetic force, said magnetic field generating portions being composed of a part of each of said principal magnetic poles, and wherein each said part is inclined with respect to the remaining part of each of said principal magnetic poles.
Claim 2
Dependent Claim
100 words
A transporting device for transporting magnetic powder with magnetic force, comprising: transport means provided with a magnet having principal magnetic poles for transporting the magnetic powder; and drive means for driving said transport means, wherein said magnet has magnetic field generating portions provided at the end portions thereof for displacing the magnetic powder toward the internal portions of the magnet by magnetic force, said magnetic field generating portions being composed of a part of each of said principal magnetic poles, and wherein each said part is inclined with respect to the remaining part of each of said principal magnetic poles.
Claim 3
Dependent Claim
94 words
A transporting device for transporting magnetic powder with magnetic force, comprising: transport means provided with a magnet having principal magnetic poles for transporting the magnetic powder; and drive means for driving said transport means, wherein said magnet has magnetic field generating portions provided at the end portions thereof for displacing the magnetic powder toward the internal portions of the magnet by magnetic force, said magnetic field generating portions being composed of auxiliary magnetic poles separate from said principal magnetic poles and having the same polarities as the principal poles with which they are associated.
Claim 4
Dependent Claim
94 words
A transporting device for transporting magnetic powder with magnetic force, comprising: transport means provided with a magnet having principal magnetic poles for transporting the magnetic powder; and drive means for driving said transport means, wherein said magnet has magnetic field generating portions provided at the end portions thereof for displacing the magnetic powder toward the internal portions of the magnet by magnetic force, said magnetic field generating portions being composed of auxiliary magnetic poles separate from said principal magnetic poles and having the same polarities as the principal poles with which they are associated.
Claim 5
Dependent Claim
35 words
A transporting device according to claim 2, wherein said auxiliary magnetic poles are of lower field intensity than, and are positioned in a spaced relation from, said principal magnetic poles at the end portions thereof.
Claim 6
Dependent Claim
45 words
A transporting device according to claim 2, wherein said auxiliary magnetic poles are paired and have the same polarities as those of corresponding principal magnetic poles but are of lower field intensity and are positioned between said corresponding principal poles at the end portions thereof.
Claim 7
Dependent Claim
38 words
A transporting device according to any of the preceding claims 1 to 4, wherein said magnet is adapted to transport the magnetic powder in a developing unit for the development of a latent images with the magnetic powder.
Claim 8
Dependent Claim
39 words
A transporting device according to any of the preceding claims 1 to 4, wherein said magnet is adapted to transport the magnetic powder in a cleaning unit for removing the magnetic powder remaining on a latent image carrying member.
Claim 9
Dependent Claim
31 words
A transporting device according to any of the preceding claims 1 to 4, wherein said transport means includes a non-magnetic member encircling said magnet device and rendered movable with respect thereto.
Claim 10
Dependent Claim
30 words
A transporting device according to claim 7, wherein said magnet is adapted to transport the magnetic powder in a developing unit for developing a latent image with the magnetic powder.
Claim 11
Dependent Claim
22 words
A transporting device according to claim 7, wherein said transport means includes a scraper positioned in facing relationship to said non-magnetic member.
Claim 12
Dependent Claim
32 words
A transporting device according to claim 9, wherein said magnet is adapted to transport the magnetic powder in a cleaning unit for removing the magnetic powder from a latent image carrying member.
Claim 13
Dependent Claim
17 words
A transporting device according to claim 10, wherein said scraper is integrally formed with said non-magnetic member.
Claim 14
Dependent Claim
35 words
A transporting device according to any of the preceding claims 1-4, wherein said magnet is mounted for rotation, and wherein said transport means includes a fixed scraper positioned in facing relationship with said rotary magnet.
Claim 15
Dependent Claim
30 words
A transporting device according to claim 12, wherein said magnet is adapted to transport the magnetic powder in a developing unit for developing a latent image with the magnetic powder.
Claim 16
Dependent Claim
32 words
A transporting device according to claim 12, wherein said magnet is adapted to transport the magnetic powder in a cleaning unit for removing the magnetic powder from a latent image carrying member.
References Cited (Backward Citations)
US3233587A
Cited
US3437074A
Cited
US3402698A
Cited
US3659311A
Cited
US3665891A
Cited
US3939801A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-02 | 1985-05-04 | 1985-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-02 | 1989-05-04 | 1989-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-02 | 1993-05-04 | 1993-11-03 | $7700.00 | Window Closed / Lapsed |