US3881446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic brush developing apparatus
Assignee: Minolta Co Ltd
•
Filing: 1974-01-17
•
Granted: 1975-05-06
•
Expires: 1994-01-17
Abstract
Abstract An efficient magnetic brush developing apparatus for the development of an electrostatic latent image which generally comprises a housing with an opening adjacent to a photoreceptor surface, a magnetic brush developing roller, a toner powder dispenser, and a rotatable vaned cylinder with a plurality of outwardly extending vanes forming buckets for transporting developer material, the mixing and diffusion for the developer material being carried out during the rotation of the vaned cylinder without causing the fatigue of developer material, and thus uneven density of the developed image being eliminated.
Inventors
- 👤 Takaji Kurita
- 👤 Takao Fujiwara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:56
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/09
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
136 words
A magnetic brush developing apparatus for developing an electrostatic latent image which comprises a housing structure with an opening adjacent to a photoreceptor surface, a magnetic brush developing roller provided at the lower part of said housing and adjacent to said photoreceptor surface, a toner powder supplying means provided above said developing roller, a vaned cylinder having a plurality of outwardly extending vanes which form buckets for transporting developer material rotatably provided close to the surface of said developing roller and a used developer material sump provided under said vaned cylinder, the majority of developer material on said developer roller being scraped off by vane tips of said vaned cylinder, carried upward in said buckets, and subsequently emptied into said used developer sump for mixing and diffusing of said developer material as said vaned cylinder rotates.
Claim 2
Dependent Claim
136 words
A magnetic brush developing apparatus for developing an electrostatic latent image which comprises a housing structure with an opening adjacent to a photoreceptor surface, a magnetic brush developing roller provided at the lower part of said housing and adjacent to said photoreceptor surface, a toner powder supplying means provided above said developing roller, a vaned cylinder having a plurality of outwardly extending vanes which form buckets for transporting developer material rotatably provided close to the surface of said developing roller and a used developer material sump provided under said vaned cylinder, the majority of developer material on said developer roller being scraped off by vane tips of said vaned cylinder, carried upward in said buckets, and subsequently emptied into said used developer sump for mixing and diffusing of said developer material as said vaned cylinder rotates.
Claim 3
Dependent Claim
63 words
A magnetic brush developing apparatus as claimed in claim 1, which further comprises a developer material sump provided under said used developer material sump and said developing roller, and also a slit adjusting plate movably attached to the underside of said used developer material sump for adjusting the width of a slit between said used developer material sump and said developer material sump.
Claim 4
Dependent Claim
29 words
A magnetic brush developing apparatus as claimed in claim 1, further comprising a second developing roller below said firstmentioned developing roller, said developing rollers rotating in the same direction.
Claim 5
Dependent Claim
27 words
A magnetic brush developing apparatus as claimed in claim 1, further comprising a magnetic brush bristle tip adjusting plate provided under and close to said developing roller.
Claim 6
Dependent Claim
161 words
A magnetic brush developing apparatus for developing an electrostatic latent image which comprises a housing structure with an opening adjacent to a photoreceptor surface, an upper developing roller and a lower developing roller in said housing structure in parallel to each other and close to said photoreceptor surface, a vaned cylinder having a plurality of outwardly extending vanes which form buckets for transporting developer material rotatably provided above said lower developing roller and also close to said upper developing roller, a toner supplying means provided over said vaned cylinder, and a used developer material sump provided under said vaned cylinder, the majority of developEr material on said lower developing roller being scraped off by vane tips of said vaned cylinder and carried upward in said buckets being subsequently emptied into said used developer sump for mixing and diffusion with the remaining part of said developer material in said buckets being supplied onto said upper developing roller as said vaned cylinder rotates.
Claim 7
Dependent Claim
161 words
A magnetic brush developing apparatus for developing an electrostatic latent image which comprises a housing structure with an opening adjacent to a photoreceptor surface, an upper developing roller and a lower developing roller in said housing structure in parallel to each other and close to said photoreceptor surface, a vaned cylinder having a plurality of outwardly extending vanes which form buckets for transporting developer material rotatably provided above said lower developing roller and also close to said upper developing roller, a toner supplying means provided over said vaned cylinder, and a used developer material sump provided under said vaned cylinder, the majority of developEr material on said lower developing roller being scraped off by vane tips of said vaned cylinder and carried upward in said buckets being subsequently emptied into said used developer sump for mixing and diffusion with the remaining part of said developer material in said buckets being supplied onto said upper developing roller as said vaned cylinder rotates.
Claim 8
Dependent Claim
57 words
A magnetic brush developing apparatus as claimed in claim 5, which further comprises a developer material sump provided under said lower developing roller and a slit adjusting plate movably attached to the underside of said used developer material sump for adjusting the width of a slit between said used developer material sump and said developer material sump.
Claim 9
Dependent Claim
28 words
A magnetic brush developing apparatus as claimed in claim 5, wherein a magnetic brush bristle tip adjusting plate is provided under and close to said lower developing roller.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |