Patent US4529294A successfully refreshed from Google Patents.
US4529294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Document scanning drum and flash exposure copier
Assignee: Xerox Corp
•
Filing: 1984-03-16
•
Granted: 1985-07-16
•
Expires: 2004-03-16
Abstract
Abstract An electrostatographic printing system is disclosed as having a document supporting drum and an optical system for scanning a document for exposing the same to a moving photoreceptor belt. The drum has its surface moved in synchronism with the belt by an a.c. synchronous motor and includes 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 the drum motor drive.
Inventors
- 👤 William G. Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:39
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/60; G03G15/602; G03G15/22; G03G15/28; G03G15/283
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
147 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 for rotating the same, an electrostatographic processor having a photoreceptor member in belt form and a belt 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 and 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 arranged to measure the positional relationship of the document sheet and said belt to apply a signal in accordance therewith 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.
Claim 2
Dependent Claim
147 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 for rotating the same, an electrostatographic processor having a photoreceptor member in belt form and a belt 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 and 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 arranged to measure the positional relationship of the document sheet and said belt to apply a signal in accordance therewith 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.
Claim 3
Dependent Claim
17 words
The printing system of claim 1 wherein each of said drive means includes an a.c. synchronous motor.
Claim 4
Dependent Claim
16 words
The printing system of claim 1 wherein said signal is applied to said drum drive means.
Claim 5
Dependent Claim
28 words
The printing system of claim 1 wherein said signal is applied when an area of the drum not supporting a document sheet is in a document scanning position.
Claim 6
Dependent Claim
166 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 for rotating the same, an electrostatographic processor having a photoreceptor member in belt form and a belt drive means for moving the same along a path to the processing stations of said processor, said drum drive means arranged to drive said drum at a higher speed than the photoreceptor member is driven, optical means for scanning a document sheet on said drum during rotation thereof and 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 measure the positional relationship of the document sheet and said belt and to apply a signal in accordance therewith to said drum drive means in the event the peripheral speed of the document sheet is not equal to the speed of said belt.
Claim 7
Dependent Claim
166 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 for rotating the same, an electrostatographic processor having a photoreceptor member in belt form and a belt drive means for moving the same along a path to the processing stations of said processor, said drum drive means arranged to drive said drum at a higher speed than the photoreceptor member is driven, optical means for scanning a document sheet on said drum during rotation thereof and 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 measure the positional relationship of the document sheet and said belt and to apply a signal in accordance therewith to said drum drive means in the event the peripheral speed of the document sheet is not equal to the speed of said belt.
References Cited (Backward Citations)
US3796486A
Cited
US3917396A
Cited
US3790270A
Cited
US3790271A
Cited
US3944794A
Cited
US3936180A
Cited
US4054380A
Cited
US3989371A
Cited
US4350750A
Cited
US4110033A
Cited
US4097138A
Cited
US4167321A
Cited
US4221480A
Cited
US4279496A
Cited
US4286706A
Cited
US4344693A
Cited
US4413900A
Cited
US4355882A
Cited
US4408867A
Cited
JPS5818643A
Cited
JPS5823023A
Cited
JPS5823066A
Cited
US4397538A
Cited
US4412740A
Cited
JPS5878176A
Cited
JPS5878169A
Cited
US4427286A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-15 | 1989-01-14 | 1989-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-15 | 1993-01-14 | 1993-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-15 | 1997-01-14 | 1997-07-16 | $7700.00 | Window Closed / Lapsed |