US3906899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Developer seal
Assignee: Xerox Corp
•
Filing: 1974-06-10
•
Granted: 1975-09-23
•
Expires: 1994-06-10
Abstract
Abstract A developer housing seal for electrophotographic apparatus in which an image developer material comprising magnetic particles is applied to a photoreceptor surface inside a developer housing held adjacent the photoreceptor. A magnetic seal is provided for retaining the developer in the developer housing, utilizing the magnetic particles, which are magnetically attracted by the magnetic fields of the seal. The seal is U-shaped, having a channel with two parallel spaced thin magnetic pole edge seal areas and a much wider recess therebetween to contain captured magnetic material. A seal is formed which reduces the likelihood of photoreceptor damage. A thin non-magnetic overlying protective shield slides off for cleaning of the seal.
Inventors
- 👤 Ganesh L Harpavat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:38
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0896; G03G15/0898; G03G15/0801
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
154 words
In electrostatographic copying apparatus wherein an image on an imaging surface is developed with imaging development material comprising magnetically attractable material in a developing station, and wherein a magnetic seal is provided adjacent said imaging surface to at least partially confine said developer material, the improvement in said magnetic seal wherein said magnetic seal comprises: a pair of elongated magnetizable pole pieces extending across said imaging surface, said pole pieces having thin edges extending toward, but spaced from, said imaging surface, said pole piece edges being substantially spaced apart; and spacing means between said pole pieces forming between said pole pieces edges an open channel recess extending away from said imaging surface and said pole piece edges, said channel recess being open to receive said magnetically attractable material between said pole pieces, said magnetic seal having a magnetic field magnetically attracting said magnetically attractable material to said pole pieces and into said channel recess.
Claim 2
Dependent Claim
154 words
In electrostatographic copying apparatus wherein an image on an imaging surface is developed with imaging development material comprising magnetically attractable material in a developing station, and wherein a magnetic seal is provided adjacent said imaging surface to at least partially confine said developer material, the improvement in said magnetic seal wherein said magnetic seal comprises: a pair of elongated magnetizable pole pieces extending across said imaging surface, said pole pieces having thin edges extending toward, but spaced from, said imaging surface, said pole piece edges being substantially spaced apart; and spacing means between said pole pieces forming between said pole pieces edges an open channel recess extending away from said imaging surface and said pole piece edges, said channel recess being open to receive said magnetically attractable material between said pole pieces, said magnetic seal having a magnetic field magnetically attracting said magnetically attractable material to said pole pieces and into said channel recess.
Claim 3
Dependent Claim
18 words
The apparatus of claim 1, wherein said magnetic seal has a U-shaped configuration opening toward said imaging surface.
Claim 4
Dependent Claim
22 words
The apparatus of claim 1, wherein one said pole piece edge is positioned substantially closer to said imaging surface than the other.
Claim 5
Dependent Claim
19 words
The apparatus of claim 1, wherein said pole piece edges and said channel are overlaid with a non-magnetizable shield.
Claim 6
Dependent Claim
19 words
The apparatus of claim 4, wherein said shield is removable to remove said developer material from saiD magnetic seal.
Claim 7
Dependent Claim
66 words
The apparatus of claim 5, wherein said shield covers said channel recess and said pole piece edges and said magnetically attractable material is confined against said shield only by said magnetic field of said magnetic seal acting through said shield whereby upon the removal of said shield from said magnetic seal said magnetic material is removed with said shield and is freely removable from said shield.
Claim 8
Dependent Claim
24 words
The apparatus of claim 6, wherein said shield is slidably mounted to said magnetic seal and slidably removable therefrom transversely of said imaging surface.
Claim 9
Dependent Claim
48 words
The apparatus of claim 4, wherein said magnetic seal has a U-shaped configuration opening toward said imaging surface, and said shield is M-shaped with the outer portions thereof closely overlying said pole piece edges and with the central portion thereof conforming to the U-shape of said channel recess.
References Cited (Backward Citations)
US3015305A
Cited
US3133834A
Cited
US3332328A
Cited
US3635196A
Cited
US3814515A
Cited
US3809012A
Cited
US3840879A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |