US3736056A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for imparting intermittent rotation to a first member in rotating registry with a second member
Assignee: DYK RESEARCH CORP VAN
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Filing: 1972-01-27
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Granted: 1973-05-29
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Expires: 1992-01-27
Abstract
Abstract An office copier in which a rotating photoconductive drum is exposed by an intermittently rotating scan mirror. A slip-free clutch intermittently couples the scan mirror to a shaft which rotates in synchronism with the photoconductive drum. When the clutch is engaged, the scan mirror is caused to rotate in a given direction in precise synchronism with rotation of the photoconductive drum, thus insuring that there is substantially no scan slip in the resulting latent image formed on the drum surface. When the scan mirror has completed its scan, the clutch is disengaged and a spring rapidly returns the scan mirror to an initial rest position in preparation for the next scan. Since the amount of rotation of the scan mirror may be varied by varying the time of engagement of the slip-free clutch, this arrangement is especially suitable for office copiers requiring variable scan length capability.
Inventors
- 👤 R C Burnet
- 👤 W F Slack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:23
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/28; G03G15/30
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
191 words
Scanning apparatus for forming an image of an object on a surface, comprising: a rotatable drive shaft; drive means for rotating said drive shaft and moving said surface in mutually synchronous slip-free relationship; an optical element mounted for rotation on a second shaft to scan said object and project an image thereof on said surface when said second shaft is rotated in synchronous relationship with the motion of said surface; means for biasing said second shaft at a given initial angular orientation with respect to said object; means including a slip-free clutch for coupling said shafts for mutually synchronous slip-free rotation whenever said object is to be scanned by said optical element, any change in the angular velocity of said drive shaft resulting from the sudden increase in the load presented to said drive means when said clutch is engaged being transmitted to said moving surface, so that the synchronous relationship between said optical element and said moving surface is unaffected by said angular velocity change, said biasing means returning said second shaft to said initial angular orientation when said clutch is disengaged after said optical element has scanned said object.
Claim 2
Dependent Claim
191 words
Scanning apparatus for forming an image of an object on a surface, comprising: a rotatable drive shaft; drive means for rotating said drive shaft and moving said surface in mutually synchronous slip-free relationship; an optical element mounted for rotation on a second shaft to scan said object and project an image thereof on said surface when said second shaft is rotated in synchronous relationship with the motion of said surface; means for biasing said second shaft at a given initial angular orientation with respect to said object; means including a slip-free clutch for coupling said shafts for mutually synchronous slip-free rotation whenever said object is to be scanned by said optical element, any change in the angular velocity of said drive shaft resulting from the sudden increase in the load presented to said drive means when said clutch is engaged being transmitted to said moving surface, so that the synchronous relationship between said optical element and said moving surface is unaffected by said angular velocity change, said biasing means returning said second shaft to said initial angular orientation when said clutch is disengaged after said optical element has scanned said object.
Claim 3
Dependent Claim
19 words
The apparatus according to claim 1, wherein said surface is photoconductive and said image is an electrostatic charge pattern.
Claim 4
Dependent Claim
13 words
The apparatus according to claim 2, wherein said biasing means comprises a spring.
Claim 5
Dependent Claim
16 words
The apparatus according to claim 3, wherein said surface is the exterior of a rotatable drum.
Claim 6
Dependent Claim
11 words
The apparatus according to claim 4, wherein said shafts are collinear.
Claim 7
Dependent Claim
19 words
The apparatUs according to claim 5, wherein said drive shaft and said drum are interconnected by a belt drive.
Claim 8
Dependent Claim
43 words
The apparatus according to claim 6, wherein said belt drive includes a third shaft upon which said drum is rotatably mounted, a first sheave secured to the drive shaft, a second sheave secured to said third shaft, and a belt engaging said sheaves.
Claim 9
Dependent Claim
28 words
The apparatus according to claim 7, wherein said sheaves include generally cylindrical belt engaging surfaces, said belt being flat and in operative engagement with said belt engaging surfaces.
Claim 10
Dependent Claim
147 words
A scan system for a copying apparatus, comprising: a first mirror; first mounting means for mounting said first mirror for rotation about a first longitudinal axis; photoconductive drum means; second mounting means for mounting said photoconductive drum means for rotation about a second longitudinal axis, said second longitudinal axis being spaced from and parallel to said first longitudinal axis; coupling means for selectively coupling said first mirror and said photoconductive drum means for registered rotation, said coupling means including a clutch means; motive means for imparting rotation to said first mirror and said photoconductive drum, said motive means causing rotation of said first mirror in a first angular direction when said clutch means is engaged; and means for rotating said first mirror in a second angular direction opposite said first angular direction, said means for rotating being operable in response to the disengagement of said clutch means.
Claim 11
Dependent Claim
147 words
A scan system for a copying apparatus, comprising: a first mirror; first mounting means for mounting said first mirror for rotation about a first longitudinal axis; photoconductive drum means; second mounting means for mounting said photoconductive drum means for rotation about a second longitudinal axis, said second longitudinal axis being spaced from and parallel to said first longitudinal axis; coupling means for selectively coupling said first mirror and said photoconductive drum means for registered rotation, said coupling means including a clutch means; motive means for imparting rotation to said first mirror and said photoconductive drum, said motive means causing rotation of said first mirror in a first angular direction when said clutch means is engaged; and means for rotating said first mirror in a second angular direction opposite said first angular direction, said means for rotating being operable in response to the disengagement of said clutch means.
Claim 12
Dependent Claim
69 words
A scan system according to claim 9, including: longitudinally extending first shaft means secured to said first mirror, said longitudinally extending first shaft means being coaxially with the first longitudinal axis; longitudinally extending second shaft means secured to said photoconductive drum means, said longitudinally extending second shaft means being coaxial with said second longitudinal axis; and wherein said clutch means is in operable engagement with said first shaft means.
Claim 13
Dependent Claim
23 words
A scan system according to claim 9, wherein said first mounting means comprises first bearing means for rotatably supporting said first shaft means.
Claim 14
Dependent Claim
27 words
A scan system according to claim 9, wherein the response time for achieving 25 percent maximum torque upon engagement of said clutch is less than 3 milliseconds.
Claim 15
Dependent Claim
25 words
A scan system according to claim 9, wherein said coupling means includes a belt drive for rotatably connecting said first mirror and said photoconductive drum.
Claim 16
Dependent Claim
46 words
A scan system according to claim 13, wherein said belt drive includes a first sheave operably secured to said first mirror, a second sheave operably secured to said photoconductive drum, and belt means engaging said first and second sheave means for imparting said registered rotation therebetween.
Claim 17
Dependent Claim
18 words
A scan system according to claim 14, wherein said motive means is operably connected to said transfer drum.
Claim 18
Dependent Claim
27 words
A scan system according to claim 10, wherein said coupling means includes a belt drive for rotatably connecting said first shaft means and said second shaft means.
Claim 19
Dependent Claim
46 words
A scan system according to claim 16, wherein said belt drive includes a first sheave secured to said first shaft means, a second sheave secured to said second shaft means, and belt means engaging said first and second sheave means for imparting said registered rotation therebetween.
Claim 20
Dependent Claim
30 words
A scan system according to claim 17, wherein said clutch means is in operable engagement with said first shaft and disposed between said first sheave means and said first mirror.
Claim 21
Dependent Claim
51 words
A scan system according to claim 9, wherein said means for rotating said first mirror in a second angular direction comprises a spring operably secured to said first shaft means, said spring being displaced and subject to load in response to rotation of said first mirror in said first angular direction.
Claim 22
Dependent Claim
42 words
A scan system according to claim 10, wherein said clutch is operable between enGaged and disengaged positions without regard to the angular position of said first shaft means whereby to permit selective rotation of said mirror to achieve any desired scan length.
References Cited (Backward Citations)
US2593088A
Cited
US3630608A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |