US4641948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and device for preventing disturbance of unfixed visible image
Assignee: Canon Inc
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Filing: 1979-02-02
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Granted: 1987-02-10
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Expires: 1999-02-02
Abstract
Abstract In a method of or a device for preventing disturbance of an unfixed image in an image formation process wherein an electrostatic image on an electrostatic image bearing member is developed by a developer, whereafter the developed visible image is transferred to a transfer medium and then the transfer medium is separated from the electrostatic image bearing member and conveyed for utilization, charge remover is provided along the conveyance path of the transfer medium to remove the charge on the surface of the transfer medium as it passes through the conveyance path, thereby preventing the visible image on the transfer medium from being disturbed.
Inventors
- 👤 Kimio Nakahata
- 👤 Tsutomu Toyono
- 👤 Atsushi Takagi
- 👤 Yoshinori Aguro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:50
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/14; G03G15/16; B; B65; B65H; B65H2301/00; B65H2301/50; B65H2301/51; B65H2301/513; B65H2301/5133
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
172 words
A method of preventing disturbance of an unfixed visible image in an image formation process wherein an electrostatic image on an electrostatic image bearing member is developed into a visible image with a developer, thereafter the developed visible image is electrostatically transferred to a transfer medium in contact therewith at a transfer station and then the transfer medium is mechanically separated from and conveyed away from the image bearing member, said method comprising the steps of disposing charge removing means having a plurality of distinct discharging portions so that the plurality of distinct discharging portions are adjacent to but spaced from the transfer medium as the transfer medium is conveyed away from the image bearing member and past the charge removing means, and maintaining the plurality of district discharging portions at a potential such that an electric field is created across the space between the transfer medium and the plurality of distinct discharging portions to electrically discharge the transfer medium and thereby prevent disturbance of the unfixed image on the transfer medium.
Claim 2
Independent Claim
172 words
A method of preventing disturbance of an unfixed visible image in an image formation process wherein an electrostatic image on an electrostatic image bearing member is developed into a visible image with a developer, thereafter the developed visible image is electrostatically transferred to a transfer medium in contact therewith at a transfer station and then the transfer medium is mechanically separated from and conveyed away from the image bearing member, said method comprising the steps of disposing charge removing means having a plurality of distinct discharging portions so that the plurality of distinct discharging portions are adjacent to but spaced from the transfer medium as the transfer medium is conveyed away from the image bearing member and past the charge removing means, and maintaining the plurality of district discharging portions at a potential such that an electric field is created across the space between the transfer medium and the plurality of distinct discharging portions to electrically discharge the transfer medium and thereby prevent disturbance of the unfixed image on the transfer medium.
Claim 3
Dependent Claim
31 words
A method according to claim 1, wherein said charge removing means includes a grounded electrode so that the charge on the surface of the transfer medium is discharged to said electrode.
Claim 4
Dependent Claim
23 words
A method according to claim 2, wherein said electrode has a toothed portion in which pointed tooth-like projections are arranged at predetermined intervals.
Claim 5
Dependent Claim
17 words
A method according to claim 2, wherein said electrode has thin wires arranged thereon at predetermined intervals.
Claim 6
Independent Claim
165 words
A device for preventing disturbance of an unfixed visible image in an image formation apparatus wherein an electrostatic image on an electrostatic image bearing member is developed into a visible image with a developer, thereafter the developed visible image is electrostatically transferred to a transfer medium in contact therewith at a transfer station and then the transfer medium is mechanically separated from and conveyed away from the image bearing member, said device comprising: charge removing means having a plurality of distinct discharging portions which portions are disposed adjacent to but spaced from the transfer medium as the transfer medium is conveyed away from the image bearing member and past the charge removing means; and means for maintaining said plurality of distinct discharging portions at a potential such as to create an electric field across the space between the transfer medium and said plurality of distinct discharging portions to electrically discharge the transfer medium and thereby prevent disturbance of the unfixed image on the transfer medium.
Claim 7
Independent Claim
165 words
A device for preventing disturbance of an unfixed visible image in an image formation apparatus wherein an electrostatic image on an electrostatic image bearing member is developed into a visible image with a developer, thereafter the developed visible image is electrostatically transferred to a transfer medium in contact therewith at a transfer station and then the transfer medium is mechanically separated from and conveyed away from the image bearing member, said device comprising: charge removing means having a plurality of distinct discharging portions which portions are disposed adjacent to but spaced from the transfer medium as the transfer medium is conveyed away from the image bearing member and past the charge removing means; and means for maintaining said plurality of distinct discharging portions at a potential such as to create an electric field across the space between the transfer medium and said plurality of distinct discharging portions to electrically discharge the transfer medium and thereby prevent disturbance of the unfixed image on the transfer medium.
Claim 8
Dependent Claim
15 words
A device according to claim 5, wherein said charge removing means includes a grounded electrode.
Claim 9
Dependent Claim
24 words
A device according to claim 6, wherein said electrode of said charge removing means includes a plurality of discharging portions having a predetermined pitch.
Claim 10
Dependent Claim
19 words
A device according to claim 7, wherein said plurality of discharging portions of said electrode are each tooth shaped.
Claim 11
Dependent Claim
20 words
A device according to claim 7, wherein said plurality of discharging portions of said electrode are each a thin wire.
Claim 12
Dependent Claim
25 words
A device according to claim 7, wherein the pitch of each of said plurality of discharging portions of said electrode is 15 mm or less.
Claim 13
Dependent Claim
25 words
A device according to claim 8, wherein the tip angle of each of said plurality of discharging portions of said electrode is 110° or less.
Claim 14
Dependent Claim
17 words
A device according to claim 5, wherein said charge removing means includes a plurality of grounded electrodes.
Claim 15
Dependent Claim
21 words
A device according to claim 5, further comprising a guide member provided between said charge removing means and the transfer medium.
Claim 16
Dependent Claim
15 words
A device according to claim 13, wherein said guide member is in a screen-like form.
Claim 17
Dependent Claim
12 words
A device according to claim 13, wherein said guide member is insulative.
Claim 18
Dependent Claim
19 words
A device according to claim 12, wherein said plurality of grounded electrodes are disposed adjacent to the transfer medium.
Claim 19
Dependent Claim
22 words
A device according to claim 12, wherein said plurality of grounded electrodes are disposed such that the transfer medium is conveyed therebetween.
Claim 20
Dependent Claim
19 words
A device according to claim 12, wherein the discharging portions of said plurality of electrodes have different contours, respectively.
Claim 21
Dependent Claim
24 words
A device according to claim 12, wherein each of said plurality of grounded electrodes includes a plurality of discharging portions having a predetermined pitch.
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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) | 1990-02-09 | 1990-08-11 | 1991-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-09 | 1994-08-11 | 1995-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-09 | 1998-08-11 | 1999-02-10 | $7700.00 | Window Closed / Lapsed |