Patent US2808754A successfully refreshed from Google Patents.
Patent US3907421A successfully refreshed from Google Patents.
US3907421A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transfer apparatus for electrostatic reproducing machines
Assignee: Xerox Corp
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Filing: 1974-02-22
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Granted: 1975-09-23
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Expires: 1994-02-22
Abstract
Abstract In an electrostatic reproducing machine, a latent electrostatic image is formed and developed on a photoreceptor belt and transferred to a copy sheet at a transfer station where a transfer roller is mounted to be in contact with the photoreceptor belt. Suitable means are provided for engaging the transfer roller into a position to be in contact with said photoreceptor belt when the machine is in operation and disengaging the transfer roller and moving it away from the photoreceptor belt so that the transfer roller does not touch the photoreceptor belt when the machine is not in operation. A brush roller may be provided for removing the residual toner particles remaining on the transfer roller and means may be provided for vacuuming the transfer roller and vicinity.
Inventors
- 👤 William E Jordan
- 👤 Edward B Barton
- 👤 Kenton W Fiske
- 👤 Roger M Swanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:56
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/14; G03G15/16; G03G15/1665; G03G15/167
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
183 words
In an electrostatic reproducing machine wherein a latent image is formed and developed by image forming particles on a moving photoreceptor surface and a transfer roller is used to transfer the image onto a copy sheet, the improvement which comprises means for engaging said transfer roller into contact with the photosensitive surface to effect the image transfer when the machine is in operation and disengaging said transfer roller away from said photosensitive surface so that the transfer roller surface is not in contact with the photosensitive surface when the machine is not in operation; and control means for generating an enabling control signal when said machine is conditioned to be ready to actuate a copy operation and for generating a disabling control signal when said machine completes a copy run or the machine operation enters into an interrupt mode due to jam or other malfunction conditions, said engaging and disengaging means responsive to said enabling control signal for engaging said roller in contact with said photoreceptor surface and responsive to said disabling control signal for disengaging said roller away from said photoreceptor surface.
Claim 2
Dependent Claim
183 words
In an electrostatic reproducing machine wherein a latent image is formed and developed by image forming particles on a moving photoreceptor surface and a transfer roller is used to transfer the image onto a copy sheet, the improvement which comprises means for engaging said transfer roller into contact with the photosensitive surface to effect the image transfer when the machine is in operation and disengaging said transfer roller away from said photosensitive surface so that the transfer roller surface is not in contact with the photosensitive surface when the machine is not in operation; and control means for generating an enabling control signal when said machine is conditioned to be ready to actuate a copy operation and for generating a disabling control signal when said machine completes a copy run or the machine operation enters into an interrupt mode due to jam or other malfunction conditions, said engaging and disengaging means responsive to said enabling control signal for engaging said roller in contact with said photoreceptor surface and responsive to said disabling control signal for disengaging said roller away from said photoreceptor surface.
Claim 3
Dependent Claim
26 words
The combination according to claim 1, including means for cleaning said transfer roller to remove the image forming particles adhering thereto after the image transfer operation.
Claim 4
Dependent Claim
39 words
The combination according to claim 2, said cleaning means includes a brush roller, means for driving said brush roller to brush the surface of said transfer roller and means for vacuuming the particles from the transfer roller and vicinity.
Claim 5
Dependent Claim
24 words
The combination according to claim 1, including means for vacuuming image forming particles remaining on said transfer roller and vicinity after the image transfer.
Claim 6
Dependent Claim
201 words
An electrostatic reproducing machine comprising: movable photoreceptor means, having photosensitive surface, means for forming and developing images on said photosensitive surface using toner particles, a copy sheet medium, a transfer roller, means for engaging said transfer roller in contact with said photoreceptor and driving them while they are in contact, means for feeding said copy sheet medium through the nip between said photosensitive surface and transfer roller, means for disengaging said transfer roller from said photosensitive surface to remove pressure applied by the roller against said surface, means for sensing a status of said machine, said sensing means producing a first signal when said machine is ready to make electrostatic copies, said sensing means producing a second signal when an operation is complete or when said machine is in a status resulting from a jam condition or other malfunction, and control means for actuating said engaging and said disengaging means to form the contact to make copies in response to said first signal and deactuating said engaging and said disengaging means for moving said transfer roller away from the photoSensitive surface to break the contact so that said roller does not touch the photosensitive surface in response to said second signal.
Claim 7
Dependent Claim
201 words
An electrostatic reproducing machine comprising: movable photoreceptor means, having photosensitive surface, means for forming and developing images on said photosensitive surface using toner particles, a copy sheet medium, a transfer roller, means for engaging said transfer roller in contact with said photoreceptor and driving them while they are in contact, means for feeding said copy sheet medium through the nip between said photosensitive surface and transfer roller, means for disengaging said transfer roller from said photosensitive surface to remove pressure applied by the roller against said surface, means for sensing a status of said machine, said sensing means producing a first signal when said machine is ready to make electrostatic copies, said sensing means producing a second signal when an operation is complete or when said machine is in a status resulting from a jam condition or other malfunction, and control means for actuating said engaging and said disengaging means to form the contact to make copies in response to said first signal and deactuating said engaging and said disengaging means for moving said transfer roller away from the photoSensitive surface to break the contact so that said roller does not touch the photosensitive surface in response to said second signal.
Claim 8
Dependent Claim
17 words
The machine according to claim 5, including vacuum cleaning means for cleaning said transfer roller and vicinity.
Claim 9
Dependent Claim
15 words
The machine according to claim 5, including a cleaning roller for brushing the transfer roller.
Claim 10
Dependent Claim
21 words
The machine according to claim 7, including vacuum means for cleaning the transfer roller and the cleaning roller and vicinity thereof.
Claim 11
Dependent Claim
47 words
The machine according to claim 8, including means for manually lifting the transfer and cleaning rollers to provide working space between the transfer roller and the photosensitive surface for enabling an operator to remove matters such as a jammed copy sheet between the rollers and the surface.
Claim 12
Dependent Claim
29 words
The machine according to claim 9, including means for driving said transfer roller and said cleaning roller, and a unitary housing means for confining said rollers within an area.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |