US5339144A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recording paper separating device with constant current control
Assignee: Sharp Corp
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Filing: 1991-08-29
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Granted: 1994-08-16
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Expires: 2011-08-29
Abstract
Abstract A recording paper separating device for use in a copying machine, the device including a transfer charger for transferring a toner image from a photosensitive member onto a recording paper by discharge effected by a charging wire accommodated in a shield casing, a bias-loaded recording paper discharger, a transfer-power source, and a control for keeping a current supplied from the power source to the charging wire constant except for the current flowing through the recording paper discharger.
Inventors
- 👤 Yukio Nakai
- 👤 Hiroshi Kida
- 👤 Masashi Hirai
- 👤 Masahiko Fujita
- 👤 Takahiro Fukunaga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:05
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/65; G03G15/6532; G03G15/6535; G03G15/14; G03G15/16; G03G15/163; G03G15/1635; G03G15/1645
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
142 words
A recording paper separating device for use in an electrophotographic apparatus, comprising: a transfer charger for transferring a toner image from a photosensitive means onto a recording paper by discharge effected by a charging wire accommodated in a shield casing, a bias-loaded recording paper discharging means, a power source, and a control means for mainlining a current supplied from the power source to the charging wire constant except for current flowing through the recording paper discharging means, wherein the discharging means includes a conductive thin plate extending transverse to a direction in which the recording paper is fed, and said conductive thin plate having a straight edge adjacent to the recording paper being fed, the straight edge being covered with an electrically resisting material that is provided with openings spaced at intervals to that the discharging means is exposed through the openings.
Claim 2
Dependent Claim
142 words
A recording paper separating device for use in an electrophotographic apparatus, comprising: a transfer charger for transferring a toner image from a photosensitive means onto a recording paper by discharge effected by a charging wire accommodated in a shield casing, a bias-loaded recording paper discharging means, a power source, and a control means for mainlining a current supplied from the power source to the charging wire constant except for current flowing through the recording paper discharging means, wherein the discharging means includes a conductive thin plate extending transverse to a direction in which the recording paper is fed, and said conductive thin plate having a straight edge adjacent to the recording paper being fed, the straight edge being covered with an electrically resisting material that is provided with openings spaced at intervals to that the discharging means is exposed through the openings.
Claim 3
Dependent Claim
158 words
A recording paper separating device for use in an electrophotographic apparatus, comprising: a transfer charger for transferring a toner image from a photosensitive means onto a recording paper by discharge effected by a charging wire accommodated in a shield casing, a bias-loaded recording paper discharging means, a power source, and a control means for mainlining a current supplied form the power source to the charging wired constant except for current flowing through the recording paper discharging means, wherein the discharging means includes a conductive thin plate extending transverse to a direction in which the recording paper is fed, and is provided with a plurality of recesses in the upstream side of the thin plate relative to the paper feeding direction, the recesses being spaced at intervals along an edge of the thin plate that is adjacent to the recording paper and having a depth in the paper feeding direction of less than the thickness of the thin plate.
Claim 4
Dependent Claim
158 words
A recording paper separating device for use in an electrophotographic apparatus, comprising: a transfer charger for transferring a toner image from a photosensitive means onto a recording paper by discharge effected by a charging wire accommodated in a shield casing, a bias-loaded recording paper discharging means, a power source, and a control means for mainlining a current supplied form the power source to the charging wired constant except for current flowing through the recording paper discharging means, wherein the discharging means includes a conductive thin plate extending transverse to a direction in which the recording paper is fed, and is provided with a plurality of recesses in the upstream side of the thin plate relative to the paper feeding direction, the recesses being spaced at intervals along an edge of the thin plate that is adjacent to the recording paper and having a depth in the paper feeding direction of less than the thickness of the thin plate.
Claim 5
Dependent Claim
22 words
A recording paper separating device according to claim 1, wherein the thickness of the thin plate is between 0.05 and 0.2 millimeters.
Claim 6
Dependent Claim
18 words
A recording paper separating device according to claim 1, wherein the openings are in the shape of trapezoids.
Claim 7
Dependent Claim
28 words
A recording paper separating device according to claim 2, wherein the depth D of the recesses and the thickness E of the thin plate satisfy the equation: 0.1(E)<D<0.9(E)
Claim 8
Dependent Claim
22 words
A recording paper separating device according to claim 2, wherein the thickness of the thin plate is between 0.05 and 0.2 millimeters.
Claim 9
Dependent Claim
18 words
A recording paper separating device according to claim 2, wherein the thin plate is made of phosphor bronze.
Claim 10
Dependent Claim
18 words
A recording paper separating device according to claim 2, wherein the thin plate is made of stainless steel.
Claim 11
Dependent Claim
27 words
A recording paper separating device according to claim 2, wherein the recesses are in the shape of triangles with the apexes pointed away from the recording paper.
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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) | 1997-08-15 | 1998-02-14 | 1998-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-08-15 | 2002-02-14 | 2002-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-08-15 | 2006-02-14 | 2006-08-16 | $7700.00 | Window Closed / Lapsed |