Patent US4425034A successfully refreshed from Google Patents.
US4425034A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for suppressing vibrations of a photoconductive belt in a processing zone of an electrostatic copying machine
Assignee: Canon Production Printing Netherlands BV
•
Filing: 1982-01-22
•
Granted: 1984-01-10
•
Expires: 2002-01-22
Abstract
Abstract Vibrations in a taut flight of a photoconductive belt moving through the image projection zone or another processing zone of an electrostatic copying machine are suppressed by means of a closed flat plate surface disposed parallel to the belt flight at a small distance therefrom, such as a distance of 1 to 2 millimeters.
Inventors
- 👤 Sake P. Roodbergen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:49
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/75; G03G15/754
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
90 words
In an electrostatic copying machine comprising a photoconductive belt movable through a processing zone in which a flight of the belt is held flat by tension between belt guiding members arranged at opposite sides of said zone, means for suppressing vibrations in said belt flight comprising a rigid plate having a closed flat surface corresponding substantially in dimensions to the dimension of said processing zone and disposed parallel to said belt flight at a distance therefrom sufficiently small that vibrations in the belt being moved through said zone are suppressed.
Claim 2
Dependent Claim
90 words
In an electrostatic copying machine comprising a photoconductive belt movable through a processing zone in which a flight of the belt is held flat by tension between belt guiding members arranged at opposite sides of said zone, means for suppressing vibrations in said belt flight comprising a rigid plate having a closed flat surface corresponding substantially in dimensions to the dimension of said processing zone and disposed parallel to said belt flight at a distance therefrom sufficiently small that vibrations in the belt being moved through said zone are suppressed.
Claim 3
Dependent Claim
15 words
A copying machine according to claim 1, said distance being of 1 to 2 mm.
Claim 4
Independent Claim
96 words
A method of suppressing vibrations in a photoconductive belt as it is moved through a processing zone of an electrostatic copying machine in which zone a flight of the belt is held flat by tension between belt guiding members arranged at opposite sides of said zone, which method comprises passing the belt through said zone on a thin layer of air constrained between said belt flight and a closed flat plate surface disposed parallel to said belt flight at a distance therefrom sufficiently small that vibrations in the belt being moved through said zone are suppressed.
Claim 5
Independent Claim
96 words
A method of suppressing vibrations in a photoconductive belt as it is moved through a processing zone of an electrostatic copying machine in which zone a flight of the belt is held flat by tension between belt guiding members arranged at opposite sides of said zone, which method comprises passing the belt through said zone on a thin layer of air constrained between said belt flight and a closed flat plate surface disposed parallel to said belt flight at a distance therefrom sufficiently small that vibrations in the belt being moved through said zone are suppressed.
Claim 6
Dependent Claim
14 words
A method according to claim 3, said distance being of 1 to 2 mm.
References Cited (Backward Citations)
USRE27313E
Cited
US3796488A
Cited
US3836245A
Cited
US3931940A
Cited
US3973846A
Cited
US4008801A
Cited
US4183658A
Cited
US4314696A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-09 | 1987-07-11 | 1988-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-09 | 1991-07-11 | 1992-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-09 | 1995-07-11 | 1996-01-10 | $7700.00 | Window Closed / Lapsed |