US5159393A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image forming apparatus having transfer device and image bearing member traveling at different speeds
Assignee: Canon Inc
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Filing: 1990-08-01
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Granted: 1992-10-27
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Expires: 2010-08-01
Abstract
Abstract An image forming apparatus includes a movable image bearing member, an image forming device for forming the image bearing member, and an image transfer device contactable to the image bearing member at an image transfer position. The transfer device transfers the image formed by the image forming device onto a transfer material while the transfer material is conveyed through the transfer position together with the image bearing member, wherein the transfer device has a hardness of 20-40 degrees (Asker-C), and it is pressed to the image bearing member at a pressure of 50-200 g/cm 2 , and wherein a peripheral speed of the transfer device at the transfer position during a transfer operation is higher than a peripheral speed of the image bearing member at the transfer position.
Inventors
- 👤 Koichi Hiroshima
- 👤 Yukihiro Ohzeki
- 👤 Junji Araya
- 👤 Yasushi Sato
- 👤 Tatsunori Ishiyama
- 👤 Kimio Nakahata
- 👤 Koichi Tanigawa
- 👤 Akihiko Takeuchi
- 👤 Takayasu Yuminamochi
- 👤 Yoshiro Tsuchiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:24
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/14; G03G15/16; G03G15/1665; G03G15/167
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
129 words
An image forming apparatus, comprising: a movable image bearing member; image forming means for forming a toner image on said image bearing member; and transfer means contactable to said image bearing member at a transfer position, said transfer means transferring the toner image formed by said image forming means onto a transfer material while the transfer material is conveyed through the transfer position together with said image bearing member; wherein said transfer means has a hardness of 20-40 degrees (Asker-C), and it is pressed to said image bearing member at a pressure of 50-200 g/cm 2 , and wherein a peripheral speed of said transfer means at the transfer position during a transfer operation is higher than a peripheral speed of said image bearing member at the transfer position.
Claim 2
Dependent Claim
129 words
An image forming apparatus, comprising: a movable image bearing member; image forming means for forming a toner image on said image bearing member; and transfer means contactable to said image bearing member at a transfer position, said transfer means transferring the toner image formed by said image forming means onto a transfer material while the transfer material is conveyed through the transfer position together with said image bearing member; wherein said transfer means has a hardness of 20-40 degrees (Asker-C), and it is pressed to said image bearing member at a pressure of 50-200 g/cm 2 , and wherein a peripheral speed of said transfer means at the transfer position during a transfer operation is higher than a peripheral speed of said image bearing member at the transfer position.
Claim 3
Dependent Claim
14 words
An apparatus according to claim 1, wherein said transfer means includes a rotatable member.
Claim 4
Dependent Claim
17 words
An apparatus according to claim 2, wherein said transfer means is in the form of a roller.
Claim 5
Dependent Claim
32 words
An apparatus according to claim 2, wherein said transfer means includes a belt-like member contactable to said image bearing member and a roller contacted to said belt-like member at an opposite side.
Claim 6
Dependent Claim
12 words
An apparatus according to claim 1, wherein said transfer means is elastic.
Claim 7
Dependent Claim
15 words
An apparatus according to claim 5, wherein said transfer means has a layer comprising EPDM.
Claim 8
Dependent Claim
20 words
An apparatus according to claim 1, wherein said transfer means is supplied with a voltage in an image transfer operation.
Claim 9
Dependent Claim
23 words
An apparatus according to claim 1, wherein said image forming means includes developing means for developing said image bearing member with a developer.
Claim 10
Dependent Claim
25 words
An apparatus according to claim 8, wherein said developing means uses a developer having toner particles and particles treated with silicone oil or silicone varnish.
Claim 11
Dependent Claim
16 words
An apparatus according to claim 1, wherein said image bearing member comprises an organic photoconductive material.
Claim 12
Dependent Claim
26 words
An apparatus according to claim 1, wherein said transfer means has a peripheral speed which is larger than that of said image bearing member by 1.0-3.0%.
Claim 13
Dependent Claim
14 words
An apparatus according to claim 5, wherein said transfer means includes a sponge layer.
Claim 14
Dependent Claim
41 words
An apparatus according to claim 1, wherein a magnification of the latent image formed on said image bearing member by said image forming means in a direction of movement of a periphery of said image bearing member is smaller than 1.0.
Claim 15
Dependent Claim
14 words
An apparatus according to claim 1, wherein the transfer material is a resin sheet.
Claim 16
Dependent Claim
136 words
An image forming apparatus, comprising: a movable image bearing member; image forming means for forming a toner image on said image bearing member; transfer means for transferring the toner image formed by said image forming means onto a transfer material at a transfer position, while the transfer material is conveyed through the transfer position with said image bearing member; and conveying means for conveying the transfer material to the transfer position while a part of the transfer material is present at the transfer position; wherein a peripheral speed of said transfer means at the transfer position during an image transfer operation is larger than a peripheral speed of said image bearing member at the transfer position, and wherein a conveying speed by said conveying means is higher than the peripheral speed of said image bearing member.
Claim 17
Dependent Claim
136 words
An image forming apparatus, comprising: a movable image bearing member; image forming means for forming a toner image on said image bearing member; transfer means for transferring the toner image formed by said image forming means onto a transfer material at a transfer position, while the transfer material is conveyed through the transfer position with said image bearing member; and conveying means for conveying the transfer material to the transfer position while a part of the transfer material is present at the transfer position; wherein a peripheral speed of said transfer means at the transfer position during an image transfer operation is larger than a peripheral speed of said image bearing member at the transfer position, and wherein a conveying speed by said conveying means is higher than the peripheral speed of said image bearing member.
Claim 18
Dependent Claim
14 words
An apparatus according to claim 15, wherein said transfer means includes a rotatable member.
Claim 19
Dependent Claim
17 words
An apparatus according to claim 16, wherein said transfer means is in the form of a roller.
Claim 20
Dependent Claim
32 words
An apparatus according to claim 16, wherein said transfer means includes a belt-like member contactable to said image bearing member and a roller contacted to said belt-like member at an opposite side.
Claim 21
Dependent Claim
12 words
An apparatus according to claim 15, wherein said transfer means is elastic.
Claim 22
Dependent Claim
14 words
An apparatus according claim 19, wherein said transfer means has a layer comprising EPDM.
Claim 23
Dependent Claim
20 words
An apparatus according to claim 15, wherein said transfer means is supplied with a voltage in an image transfer operation.
Claim 24
Dependent Claim
27 words
An apparatus according to claim 15, wherein said image forming means includes developing means for developing a latent image on said image bearing member with a developer.
Claim 25
Dependent Claim
25 words
An apparatus according to claim 22, wherein said developing means uses a developer having toner particles and particles treated with silicone oil or silicone varnish.
Claim 26
Dependent Claim
16 words
An apparatus according to claim 15, wherein said image bearing member comprises an organic photoconductive material.
Claim 27
Dependent Claim
26 words
An apparatus according to claim 15, wherein said transfer means has a peripheral speed which is larger than that of said image bearing member by 1.0-3.0%.
Claim 28
Dependent Claim
14 words
An apparatus according to claim 19, wherein said transfer means includes a sponge layer.
Claim 29
Dependent Claim
41 words
An apparatus according to claim 16, wherein a magnification of the latent image formed on said image bearing member by said image forming means in a direction of movement of a periphery of said image bearing member is smaller than 1.0.
Claim 30
Dependent Claim
14 words
An apparatus according to claim 15, wherein the transfer material is a resin sheet.
Claim 31
Dependent Claim
21 words
An apparatus according to claim 15, wherein the transfer material is plain paper having basis weight of 64-105 g/m 2 .
Claim 32
Dependent Claim
21 words
An apparatus according to claim 15, wherein the conveying speed is 1.01-1.10 times the peripheral speed of said image bearing member.
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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) | 1995-10-27 | 1996-04-27 | 1996-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-27 | 2000-04-27 | 2000-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-27 | 2004-04-27 | 2004-10-27 | $7700.00 | Window Closed / Lapsed |