US4684240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Document scanning drum and flash exposure copier
Assignee: Xerox Corp
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Filing: 1984-03-16
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Granted: 1987-08-04
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Expires: 2004-03-16
Abstract
Abstract An electrostatographic printing system is disclosed as having a document supporting drum and an optical means for scanning a document for exposing the same to a moving photoreceptor belt. The belt and the drum have their surfaces moved in synchronism by a motor drive for each and including a control system devised to sense the relative velocities of the compared velocities of the belt and drum surfaces and to produce a correction signal for one of the motor drives.
Inventors
- 👤 William G. Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:01
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/50; G03G15/5033; G03G2215/00; G03G2215/00025; G03G2215/00071; G03G2215/00075
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
182 words
An electrostatographic printing system comprising: a document scanning assembly having a drum upon which a document sheet is applied and a drum drive means having a servo motor for rotating the same, an electrostatographic processor having a photoreceptor member in belt form and a drive means for moving the same along a path to the processing stations of said processor, optical means for scanning a document sheet on said drum during rotation thereof for producing imaging rays and directing the rays on said photoreceptor member in flowing sequence during movement thereof, and control means associated with said drum drive means and said belt drive means adapted to produce a correction signal and to apply the same to one of said drive means in the event the peripheral speed of the document sheet is not equal to the speed of said belt, said control means also being adapted to produce a positional signal indicative of the relative positions of said drum and said belt and to apply the same to one of said drive means during an inactive scanning position on said drum.
Claim 2
Dependent Claim
182 words
An electrostatographic printing system comprising: a document scanning assembly having a drum upon which a document sheet is applied and a drum drive means having a servo motor for rotating the same, an electrostatographic processor having a photoreceptor member in belt form and a drive means for moving the same along a path to the processing stations of said processor, optical means for scanning a document sheet on said drum during rotation thereof for producing imaging rays and directing the rays on said photoreceptor member in flowing sequence during movement thereof, and control means associated with said drum drive means and said belt drive means adapted to produce a correction signal and to apply the same to one of said drive means in the event the peripheral speed of the document sheet is not equal to the speed of said belt, said control means also being adapted to produce a positional signal indicative of the relative positions of said drum and said belt and to apply the same to one of said drive means during an inactive scanning position on said drum.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-03 | 1991-02-02 | 1991-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-03 | 1995-02-02 | 1995-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-03 | 1999-02-02 | 1999-08-04 | $7700.00 | Window Closed / Lapsed |