Patent US5386279A successfully refreshed from Google Patents.
US5386279A
Expired / Lapsed
US
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Transfer device in an image-forming apparatus
Assignee: Kyocera Mita Industrial Co Ltd
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Filing: 1994-02-25
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Granted: 1995-01-31
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Expires: 2014-02-25
Abstract
Abstract An image carrier of an organic photosensitive material containing a charge-generating agent and a charge-transporting agent, and a transfer roller using an electrically conducting polyurethane rubber composition which is so cured as to exhibit a rubber hardness of higher than 50° (JIS A), are disposed being spaced apart maintaining a small gap which is greater than the thickness of the transfer material enabling the toner to be transferred onto the transfer material. This makes it possible to prevent the occurrence of image defects such as white spots and the like, to form transferred image favorably and stably over an extended period of time maintaining a high density without fogging and consuming a small transfer current.
Inventors
- 👤 Toshiyuki Fukami
- 👤 Masashi Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:32
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/14; G03G15/16; G03G15/163
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
120 words
A transfer device in an image-forming apparatus which has an image carrier and a transfer roller, and permits a transfer material to pass therethrough so that the toner on the image carrier is transferred onto the transfer material, wherein said image carrier is an organic photosensitive material containing a charge-generating agent and a charge-transporting agent, said transfer roller is made of an electrically conducting polyurethane rubber composition which is so cured as to exhibit a rubber hardness of higher than 50° (JIS A), and said image carrier and said transfer roller are disposed being spaced apart maintaining a small gap which is greater than the thickness of the transfer material enabling the toner to be transferred onto the transfer material.
Claim 2
Dependent Claim
120 words
A transfer device in an image-forming apparatus which has an image carrier and a transfer roller, and permits a transfer material to pass therethrough so that the toner on the image carrier is transferred onto the transfer material, wherein said image carrier is an organic photosensitive material containing a charge-generating agent and a charge-transporting agent, said transfer roller is made of an electrically conducting polyurethane rubber composition which is so cured as to exhibit a rubber hardness of higher than 50° (JIS A), and said image carrier and said transfer roller are disposed being spaced apart maintaining a small gap which is greater than the thickness of the transfer material enabling the toner to be transferred onto the transfer material.
Claim 3
Dependent Claim
17 words
A transfer device according to claim 1, wherein said small gap is from 0.2 to 2 mm.
Claim 4
Dependent Claim
34 words
A transfer device according o claim 1, wherein said transfer roller is made of a polyurethane rubber composition which is so cured as to exhibit a rubber hardness of 70° (JIS A) or higher.
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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) | 1998-01-30 | 1998-08-01 | 1999-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-01-30 | 2002-08-01 | 2003-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-01-30 | 2006-08-01 | 2007-01-31 | $7700.00 | Window Closed / Lapsed |