US4197813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic brush development apparatus with developer supply detecting means
Assignee: Ricoh Co Ltd
•
Filing: 1978-11-30
•
Granted: 1980-04-15
•
Expires: 1998-11-30
Abstract
Abstract The magnetic brush development apparatus for developing a latent electrostatic image on a photoconductive material by a magnetic brush formed on a development sleeve comprises a hopper whose outlet for supplying one-component type magnetic developer to the development sleeve is positioned in proximity to the surface of the development sleeve, and a developer detecting apparatus comprising a light emitting element and a light receiving element is positioned in proximity to the outlet of the hopper and the surface of the development sleeve. The light emitting element and the light receiving element are positioned so as to hold therebetween a transparent container for allowing the developer to pass therethrough.
Inventors
- 👤 Takashi Yano
- 👤 Mitsuo Shibusawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:39
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/09; G03G15/0914; G03G15/0822; G03G15/0848; G03G15/0849; G03G15/0855; G03G15/0856; G03G2215/00; G03G2215/06; G03G2215/0602; G03G2215/0604; G03G2215/0614; G03G2215/08; G03G2215/0888; G03G2215/0891; G03G2215/0894; G03G2215/0897; Y; Y10; Y10S; Y10S222/00; Y10S222/01
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
111 words
In a magnetic brush development apparatus in which a latent electrostatic image formed on a photoconductive material is developed by a magnetic brush formed on a development sleeve having a magnet therein by supplying one-component type magnetic developer to said development sleeve, the improvement wherein an outlet of a hopper for supplying said developer to said development sleeve is positioned in proximity to the surface of said development sleeve, and a developer detecting means comprising a light emitting element and a light receiving element for detecting the presence of said developer in said hopper is positioned in proximity to said outlet of said hopper and the surface of said development sleeve.
Claim 2
Dependent Claim
111 words
In a magnetic brush development apparatus in which a latent electrostatic image formed on a photoconductive material is developed by a magnetic brush formed on a development sleeve having a magnet therein by supplying one-component type magnetic developer to said development sleeve, the improvement wherein an outlet of a hopper for supplying said developer to said development sleeve is positioned in proximity to the surface of said development sleeve, and a developer detecting means comprising a light emitting element and a light receiving element for detecting the presence of said developer in said hopper is positioned in proximity to said outlet of said hopper and the surface of said development sleeve.
Claim 3
Dependent Claim
53 words
A magnetic brush development apparatus as claimed in claim 1, wherein said developer detecting means comprises a container made of a transparent material capable of allowing said developer to pass therethrough, and said light emitting element and said light receiving element are respectively positioned across said container so as to face each other.
Claim 4
Dependent Claim
28 words
A magnetic brush development apparatus as claimed in claim 2, said container of said developer detecting means is formed in a part of a wall of said hopper.
Claim 5
Dependent Claim
26 words
A magnetic brush development apparatus as claimed in claim 2, wherein said light emitting element and said light receiving element are rockably supported on a bracket.
Claim 6
Dependent Claim
21 words
A magnetic brush development apparatus as claimed in claim 3, wherein said container is detachable from said wall of said hopper.
Claim 7
Dependent Claim
22 words
A magnetic brush development apparatus as claimed in claim 3, wherein said container is formed integrally with said wall of said hopper.
References Cited (Backward Citations)
US3765654A
Cited
US3872825A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-15 | 1983-10-15 | 1984-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-15 | 1987-10-15 | 1988-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-15 | 1991-10-15 | 1992-04-15 | $7700.00 | Window Closed / Lapsed |