US3923391A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic photographic copying apparatus
Assignee: Kyocera Mita Industrial Co Ltd
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Filing: 1973-09-21
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Granted: 1975-12-02
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Expires: 1993-09-21
Abstract
Abstract An electrostatic photographic copying apparatus comprising a frame member having a transparent plate on which to place an original to be copied, a rotatable photosensitive drum having an electrostatic photographic material on its periphery, an optical system for projecting an image of the original onto the surface of the photographic material, an image-forming zone disposed exteriorly of, and alongside, the periphery of said photosensitive drum for forming on said sensitive material an electrostatic latent image corresponding to the image of the original or a developed image corresponding to the latent image, a transfer zone for transferring said image to a transfer paper, and a transfer paper forwarding system for feeding the transfer paper on which the image has been transferred to a discharge end through a desired treating zone.
Inventors
- 👤 Takaji Washio
- 👤 Koichi Sasaki
- 👤 Tatsuo Aizawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:20
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/70; G03G15/22; G03G15/28; G03G15/30
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
413 words
An electrostatic photographic copying apparatus comprising: a frame defining a housing with a top surface having a transparent plate on which an original to be copied is placed, a rotatable photosensitive drum for rotation in one direction as the apparatus copies having an electrostatic photographic material on the periphery thereof, an image-forming zone disposed adjacent to the periphery of said photosensitive drum for forming on said photosensitive material an electrostatic latent image corresponding to the image of the original and a developed image corresponding to the latent image, a transfer zone for transferring said image to a transfer paper, and a transfer paper forwarding system for feeding the transfer paper on which the image has been transferred to said transfer zone and through a desired treating zone to a discharge end; wherein said photosensitive drum is disposed within the housing with the top of the periphery thereof approaching and confronting an inner surface of the top plate of the housing adjacent a location on the inner surface; wherein said transfer zone is positioned at an angle exceeding 180* in the direction of rotation of the photosensitive drum from the location on the inner surface of the top plate; wherein said transfer paper forwarding system forwards a transfer paper in a substantially linear, upwardly inclined passage extending from an inlet end through the transfer zone to the discharge end; wherein said inlet end is preceded by a nip roller adjacent thereto; wherein said image forming zone includes at least one charging member for electrically charging said photographic material, an optical system for projecting an image of the original onto the surface of the photographic material and a developing device for developing the electrostatic latent image formed on said photographic material which are all housed within a first area defined on at least three sides of the top surface of said housing, the circumferential surface of the photosensitive drum extending from the top thereof to the transfer zone in the direction of rotation of the photosensitive drum and the transfer paper forwarding system; and wherein a transfer paper removing member and a photosensitive drum cleaning member are housed within a second area defined on at least three sides by the top surface of the housing, the circumferential surface of the photosensitive drum which extends from thE top of the photosensitive drum to the transfer zone in a direction opposite to the direction of rotation of the photosensitive drum and by the transfer paper forwarding system.
Claim 2
Dependent Claim
413 words
An electrostatic photographic copying apparatus comprising: a frame defining a housing with a top surface having a transparent plate on which an original to be copied is placed, a rotatable photosensitive drum for rotation in one direction as the apparatus copies having an electrostatic photographic material on the periphery thereof, an image-forming zone disposed adjacent to the periphery of said photosensitive drum for forming on said photosensitive material an electrostatic latent image corresponding to the image of the original and a developed image corresponding to the latent image, a transfer zone for transferring said image to a transfer paper, and a transfer paper forwarding system for feeding the transfer paper on which the image has been transferred to said transfer zone and through a desired treating zone to a discharge end; wherein said photosensitive drum is disposed within the housing with the top of the periphery thereof approaching and confronting an inner surface of the top plate of the housing adjacent a location on the inner surface; wherein said transfer zone is positioned at an angle exceeding 180* in the direction of rotation of the photosensitive drum from the location on the inner surface of the top plate; wherein said transfer paper forwarding system forwards a transfer paper in a substantially linear, upwardly inclined passage extending from an inlet end through the transfer zone to the discharge end; wherein said inlet end is preceded by a nip roller adjacent thereto; wherein said image forming zone includes at least one charging member for electrically charging said photographic material, an optical system for projecting an image of the original onto the surface of the photographic material and a developing device for developing the electrostatic latent image formed on said photographic material which are all housed within a first area defined on at least three sides of the top surface of said housing, the circumferential surface of the photosensitive drum extending from the top thereof to the transfer zone in the direction of rotation of the photosensitive drum and the transfer paper forwarding system; and wherein a transfer paper removing member and a photosensitive drum cleaning member are housed within a second area defined on at least three sides by the top surface of the housing, the circumferential surface of the photosensitive drum which extends from thE top of the photosensitive drum to the transfer zone in a direction opposite to the direction of rotation of the photosensitive drum and by the transfer paper forwarding system.
Claim 3
Dependent Claim
80 words
The apparatus of claim 1, wherein said transfer paper forwarding system includes means for feeding a continuous web of transfer paper to said nip roller, a cutting device for cutting the continuous web, an insertion opening for a separated sheet-like transfer paper, means for feeding the sheet-like transfer paper inserted from said insertion opening to said nip roller and means for bringing the web of transfer paper and sheet-like transfer paper into contact with the surface of the photographic material.
Claim 4
Dependent Claim
66 words
The apparatus of claim 2, wherein said means for feeding the sheet-like transfer paper feeds the paper into an extension of the substantially linear, upwardly inclined passage from said insertion opening to said nip roller, wherein said passage and said extension combine to make a single, continuous linear passage, whereby the sheet-like transfer paper is forwarded substantially linearly from said insertion opening to said discharge end.
Claim 5
Dependent Claim
206 words
The apparatus of claim 3, wherein said transfer paper forwarding system includes a synchronizing transfer roller provided downstream of the insertion opening, a sheet-like transfer paper detecting switch provided adjacent to the nip position of the synchronizing transfer roller, a drive system for rotating said photosensitive drum at substantially the same speed as the transfer speed of the sheet-like transfer paper, a switch means which emits a signal upon detecting arrival of a forward edge of an area of the photosensitive drum on which an image is formed, said switch means being spaced from a position of contact between the photosensitive drum and the sheet-like transfer paper by a distance equal to the distance between said contact position and the sheet-like transfer paper detecting switch in a direction opposite to the direction of rotation of the drum, means for stopping rotation of said synchronizing transfer roller when the leading edge of the sheet-like transfer paper has touched the detecting switch and for resuming rotation thereof in response to the signal from said switch means, whereby the leading edge of the sheet-like transfer paper reaches the transfer zone in synchronization with the forward edge of the area on the photosensitive drum on which an image is formed.
Claim 6
Dependent Claim
41 words
The apparatus of claim 1, wherein the transfer paper is dispensed from a roll in a continuous web, wherein said roll is contained in a space adjacent said first area to place said first area between said drum and said roll.
Claim 7
Dependent Claim
50 words
The apparatus of claim 5, wherein means are provided for feeding separate sheets of the transfer paper and wherein said means includes a downwardly directed linear extension of said upwardly inclined passage positioned upstream of said nip roller, said extension extending below said space in which said roll is contained.
Claim 8
Dependent Claim
39 words
The apparatus of claim 1, wherein a substantially empty space is provided in said housing below said upwardly inclined passage, said space extending downstream of said transfer zone to said discharge end to facilitate access to said transfer passage.
Claim 9
Dependent Claim
20 words
The apparatus of claim 7, wherein said discharge end is positioned in a plane above the bottom of 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) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |