US4739363A
Expired / Lapsed
US
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Image forming apparatus
Assignee: Canon Inc
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Filing: 1986-03-24
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Granted: 1988-04-19
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Expires: 2006-03-24
Abstract
Abstract An image forming apparatus provided with an image transfer discharger for electrostatically transferring the toner image from an image bearing member to a transfer material. It is further provided with charge removing member for removing charge so as to allow the electrostatically attached transfer material from the image bearing member. The charge removing electrode is supplied with a bias voltage from a power source for the developing device, thus the additional means required for the charge removing electrode is minimized. The discharging electrode extends from a bottom of a recess formed by an insulating member. The recess is larger away from the free end of the discharging electrode toward the outside.
Inventors
- 👤 Norihisa Hoshika
- 👤 Hiroyuki Adachi
- 👤 Kimio Nakahata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:17
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/65; G03G15/6532; G03G15/6535; G03G15/14; G03G15/16; G03G15/163; G03G15/1635; B; B65; B65H; B65H2301/00; B65H2301/50; B65H2301/51; B65H2301/513; B65H2301/5133
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
113 words
An image forming apparatus, comprising: an image bearing member; transferring means for electrostatically transferring a toner image formed on said image bearing member onto a transfer material; a charge removing electrode disposed downstream of said transferring means with respect to movement of the transfer material; and power source means for applying to said charge removing electrode a voltage not higher than a voltage with which a self discharge starts; developing means for forming the toner image on said image bearing member; and power source means for supplying a developing bias to said developing means, wherein said power source means for said charge removing electrode uses said power source means for said developing bias.
Claim 2
Dependent Claim
113 words
An image forming apparatus, comprising: an image bearing member; transferring means for electrostatically transferring a toner image formed on said image bearing member onto a transfer material; a charge removing electrode disposed downstream of said transferring means with respect to movement of the transfer material; and power source means for applying to said charge removing electrode a voltage not higher than a voltage with which a self discharge starts; developing means for forming the toner image on said image bearing member; and power source means for supplying a developing bias to said developing means, wherein said power source means for said charge removing electrode uses said power source means for said developing bias.
Claim 3
Dependent Claim
18 words
An apparatus according to claim 1, wherein said power source means for said electrode includes a rectifying circuit.
Claim 4
Dependent Claim
14 words
An apparatus according to claim 1, wherein said charge removing electrode has discharging portions.
Claim 5
Dependent Claim
17 words
An apparatus according to claim 3, wherein said discharging portions are each in a form of needle.
Claim 6
Dependent Claim
19 words
An apparatus according to claim 3, wherein said discharging portions are each in a form of a saw tooth.
Claim 7
Dependent Claim
29 words
An apparatus according to claim 1 or 3, wherein said charge removing electrode has a width larger than a maximum width of the transfer material usable with said apparatus.
Claim 8
Dependent Claim
45 words
An apparatus according to claim 1 or 3, further comprising an insulating member at least upstream of said charge removing electrode and which forms a wall adjacent said charge removing electrode, which wall defines a space which increases in width toward said image bearing member.
Claim 9
Dependent Claim
23 words
An apparatus according to claim 7, further comprising insulating transfer material conveying means which defines a wall downstream of said charge removing electrode.
Claim 10
Dependent Claim
100 words
An image forming apparatus, comprising: an image bearing member; transferring means for electrostatically transferring a toner image formed on said image bearing member onto a transfer material; a charge removing electrode, disposed downstream of said transferring means with respect to movement of the transfer material, for removing charge from the transfer material using self-discharge; and power source means for applying to said charge removing electrode a voltage not higher than a voltage with which the self-discharge starts; an insulating member defining space in which said charge removing electrode is exposed, said space increasing in width toward the image bearing member.
Claim 11
Dependent Claim
100 words
An image forming apparatus, comprising: an image bearing member; transferring means for electrostatically transferring a toner image formed on said image bearing member onto a transfer material; a charge removing electrode, disposed downstream of said transferring means with respect to movement of the transfer material, for removing charge from the transfer material using self-discharge; and power source means for applying to said charge removing electrode a voltage not higher than a voltage with which the self-discharge starts; an insulating member defining space in which said charge removing electrode is exposed, said space increasing in width toward the image bearing member.
Claim 12
Dependent Claim
20 words
An apparatus according to claim 9, wherein said insulating member forms walls downstream and upstream of said charge removing electrode.
Claim 13
Dependent Claim
28 words
An apparatus according to claim 10, further comprising transfer material conveying means for conveying a transfer material which is insulating, and the conveying means defines the downstream wall.
Claim 14
Dependent Claim
14 words
An apparatus according to claim 9, wherein said charge removing electrode has discharging portions.
Claim 15
Dependent Claim
18 words
An apparatus according to claim 12, wherein said discharging portions are each in a form of a needle.
Claim 16
Dependent Claim
19 words
An apparatus according to claim 12, wherein said discharging portions are each in a form of a saw tooth.
Claim 17
Dependent Claim
27 words
An apparatus according to claim 12, wherein said charge removing electrode has a width larger than a maximum width of the transfer material usable with said apparatus.
Claim 18
Dependent Claim
26 words
An apparatus according to claim 9, wherein the space expands in a downsteam direction with respect to the movement of the transfer material which is insulating.
Claim 19
Dependent Claim
114 words
An image forming apparatus, comprising: an image bearing member; transferring means for electrostatically transferring a toner image formed on said image bearing member onto a transfer material; a charge removing electrode, disposed downstream of said transferring means with repsect to movement of the transfer material, for removing charge from the transfer material using self-discharge; and power source means for applying to said charge removing electrode a voltage to higher than a voltage with which the self-discharge starts; an insulating member defining a wall upstream of said charge removing means, said wall providing a surface, at a downstream side thereof, which is inclined to an upstream side in a direction toward the image bearing member.
Claim 20
Dependent Claim
114 words
An image forming apparatus, comprising: an image bearing member; transferring means for electrostatically transferring a toner image formed on said image bearing member onto a transfer material; a charge removing electrode, disposed downstream of said transferring means with repsect to movement of the transfer material, for removing charge from the transfer material using self-discharge; and power source means for applying to said charge removing electrode a voltage to higher than a voltage with which the self-discharge starts; an insulating member defining a wall upstream of said charge removing means, said wall providing a surface, at a downstream side thereof, which is inclined to an upstream side in a direction toward the image bearing member.
Claim 21
Dependent Claim
32 words
An apparatus according to claim 17, further comprising transfer material conveying means for conveying the transfer material which is insulating, and the conveying means provides an additional downstream said charge removing electrode.
Claim 22
Dependent Claim
14 words
An apparatus according to claim 17, wherein said charge removing electrode has discharging portions.
Claim 23
Dependent Claim
18 words
An apparatus according to claim 19, wherein said discharging portions are each in a form of a needle.
Claim 24
Dependent Claim
19 words
An apparatus according to claim 19, wherein said discharging portions are each in a form of a saw tooth.
Claim 25
Dependent Claim
27 words
An apparatus according to claim 19, wherein said charge removing electrode has a width larger than a maximum width of the transfer material usable with said apparatus.
Claim 26
Dependent Claim
24 words
An apparatus according to claim 17, wherein the space expands toward downstream with respect to the movement of the transfer material which is insulating.
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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) | 1991-04-19 | 1991-10-19 | 1992-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-19 | 1995-10-19 | 1996-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-19 | 1999-10-19 | 2000-04-19 | $7700.00 | Window Closed / Lapsed |