Patent US2440193A successfully refreshed from Google Patents.
Patent US4339196A successfully refreshed from Google Patents.
US4339196A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Eccentric cam for electrophotocopier developer unit
Assignee: Pitney Bowes Inc
•
Filing: 1980-11-28
•
Granted: 1982-07-13
•
Expires: 2000-11-28
Abstract
Abstract An improvement in an electrophotocopying machine having a photoconductive surface and a retractable, pivotably mounted developer unit for developing an electrostatic image on the photoconductive surface. The improvement comprises at least one eccentric cam for moving said developer unit into and out of developing engagement with said photoconductive surface, said cam having a curved, cantilevered arm extending therefrom, said arm increasing the effective radius of said cam starting from the junction of the arm with the cam to the end of the arm remote from said junction, and means for reciprocally rotating said cam whereby said cam moves said developer unit into and out of developing engagement with said photoconductive surface.
Inventors
- 👤 Christian A. Beck
- 👤 Paul J. Macaluso
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:57
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0896
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
109 words
In an electrophotocopying machine having a photoconductive surface and a retractable, pivotably mounted developer unit for developing an electrostatic image on the photoconductive surface, the improvement comprising at least one eccentric cam for moving said developer unit into and out of developing engagement with said photoconductive surface, said cam having a curved, cantilevered arm extending therefrom, said arm increasing the effective radius of said cam starting from the junction of the arm with the cam to the end of the arm remote from said junction, and means for reciprocally rotating said cam whereby said cam moves said developer unit into and out of developing engagement with said photoconductive surface.
Claim 2
Dependent Claim
109 words
In an electrophotocopying machine having a photoconductive surface and a retractable, pivotably mounted developer unit for developing an electrostatic image on the photoconductive surface, the improvement comprising at least one eccentric cam for moving said developer unit into and out of developing engagement with said photoconductive surface, said cam having a curved, cantilevered arm extending therefrom, said arm increasing the effective radius of said cam starting from the junction of the arm with the cam to the end of the arm remote from said junction, and means for reciprocally rotating said cam whereby said cam moves said developer unit into and out of developing engagement with said photoconductive surface.
Claim 3
Dependent Claim
20 words
The improvement of claim 1, wherein there are a pair of cams located at either end of the developer unit.
Claim 4
Dependent Claim
14 words
The improvement of claim 2, wherein the developer unit employs single component developer material.
Claim 5
Dependent Claim
14 words
The improvement of claim 3, wherein the photoconductive surface is mounted on a drum.
Claim 6
Dependent Claim
21 words
The improvement of claim 4, wherein the developer unit includes a magnetic brush for applying developer material to the electrostatic image.
Claim 7
Dependent Claim
32 words
The improvement of claim 5, additionally comprising a pair of spacer wheels situated at either end of the magnetic brush, said wheels able to ride on the drum adjacent the photoconductive surface.
References Cited (Backward Citations)
US3462217A
Cited
US3357325A
Cited
US3957367A
Cited
US3924944A
Cited
US3970042A
Cited
US4087168A
Cited
US4097139A
Cited
US4294534A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-07-12 | 1986-01-11 | 1986-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-12 | 1990-01-11 | 1990-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-12 | 1994-01-11 | 1994-07-13 | $7700.00 | Window Closed / Lapsed |