US4560268A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image forming apparatus with pretransfer discharger
Assignee: Toshiba Corp
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Filing: 1983-09-08
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Granted: 1985-12-24
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Expires: 2003-09-08
Abstract
Abstract In an image forming apparatus, a main charger, an exposure section, a developing device, a pair of restart rollers, a transfer device, a separator, a cleaning unit and a discharger surround an image carrier and are arranged successively along a rotating direction of the drum. One of the restart rollers on the image carrier side includes a discharge lamp.
Inventors
- 👤 Fuminobu Nishimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:23
CPC Classifications
G; G03; G03G; G03G21/00; G03G21/06; G03G21/08; G03G15/00; G03G15/22; G03G15/28; G03G15/30
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
146 words
An image forming apparatus comprising: a rotatable image carrier for carrying an image formed thereon; developing means for developing the image formed on the image carrier with a developer to form a developer image; transfer means for transferring the developer image from the image carrier to a transfer paper, said developing means and transfer means both being arranged around the image carrier and with a space therebetween; and paper supplying means for supplying the transfer paper to said space between the transfer means and the image carrier, said paper supplying means including a pair of paper feed rollers, arranged beside the image carrier and between the developing means and transfer means, for clamping and conveying the transfer paper, one of said paper feed rollers including discharge means therein for attenuating the holding force of the electric charges defining the electrostatic latent image on the image carrier.
Claim 2
Dependent Claim
146 words
An image forming apparatus comprising: a rotatable image carrier for carrying an image formed thereon; developing means for developing the image formed on the image carrier with a developer to form a developer image; transfer means for transferring the developer image from the image carrier to a transfer paper, said developing means and transfer means both being arranged around the image carrier and with a space therebetween; and paper supplying means for supplying the transfer paper to said space between the transfer means and the image carrier, said paper supplying means including a pair of paper feed rollers, arranged beside the image carrier and between the developing means and transfer means, for clamping and conveying the transfer paper, one of said paper feed rollers including discharge means therein for attenuating the holding force of the electric charges defining the electrostatic latent image on the image carrier.
Claim 3
Dependent Claim
16 words
An image forming apparatus according to claim 1, wherein said discharging means includes a discharge lamp.
Claim 4
Dependent Claim
63 words
An image forming apparatus according to claim 2, wherein said one paper feed roller includes a cylindrical body which has light transmitting capability and whose outer surface is engageable with the transfer paper, and wherein said discharging lamp includes a light source contained in the cylindrical body which light source radiates through the cylindrical body a light beam for de-electrifying the electric charges.
Claim 5
Dependent Claim
43 words
An image forming apparatus according to claim 3, further comprising a filter on a peripheral surface of said cylindrical body for intercepting those components of light beam from the lamp which correspond to wavelengths which would cause the image carrier to heat up.
Claim 6
Dependent Claim
16 words
An image forming apparatus according to claim 1, wherein said discharging means includes a corona charger.
Claim 7
Dependent Claim
47 words
An image forming apparatus according to claim 5, wherein said one paper feed roller includes a cylindrical body which contains the corona charger, and has an outer peripheral wall with a number of holes through which the corona from the corona charger passes to the image carrier.
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) | 1988-12-23 | 1989-06-24 | 1989-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-23 | 1993-06-24 | 1993-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-23 | 1997-06-24 | 1997-12-24 | $7700.00 | Window Closed / Lapsed |