US4706320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic charging and cleaning brushes
Assignee: Xerox Corp
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Filing: 1985-12-04
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Granted: 1987-11-17
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Expires: 2005-12-04
Abstract
Abstract A cylindrical fiber brush useful in electrostatic charging and cleaning in an electrostatographic imaging process comprises an elongated cylindrical core having bound thereto a spirally wound conductive pile fabric strip forming a spiral seam between adjacent windings of the fabric strip, the fiber fill density of said fabric strip at the strip edge being at least double the fiber fill density in the center portion of the fabric strip. The increased fiber fill density at the strip edges provides additional fibers to fill the seams between the adjacent windings and improves the charging and cleaning performance at low rotational speeds.
Inventors
- 👤 Joseph A. Swift
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:03
CPC Classifications
H; H05; H05F; H05F3/00; H05F3/02; A; A46; A46B; A46B9/00; A46B9/02; A46D; A46D1/00; G; G03; G03G; G03G15/00; G03G15/02; G03G15/0208; G03G15/0216; G03G15/0233; G03G21/00; G03G21/0005; G03G21/0035; Y; Y10; Y10S; Y10S15/00; Y10S15/06
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
57 words
A cylindrical fiber brush comprising an elongated cylindrical core having bound thereto a spirally wound conductive pile fabric strip forming a spiral seam between adjacent windings of said fabric strip, the fiber density of said fabric strip at the strip edges being at least double the fiber fill density in the center portion of the fabric strip.
Claim 2
Dependent Claim
57 words
A cylindrical fiber brush comprising an elongated cylindrical core having bound thereto a spirally wound conductive pile fabric strip forming a spiral seam between adjacent windings of said fabric strip, the fiber density of said fabric strip at the strip edges being at least double the fiber fill density in the center portion of the fabric strip.
Claim 3
Dependent Claim
17 words
The cylindrical fiber brush of claim 1 wherein said fabric is a cut plush pile woven fabric.
Claim 4
Dependent Claim
17 words
The cylindrical fiber brush of claim 1 wherein said fabric is adhesively bound to said cylindrical core.
Claim 5
Dependent Claim
15 words
The cylindrical fiber brush of claim 3 wherein said core and said adhesive are conductive.
Claim 6
Dependent Claim
12 words
The cylindrical fiber brush of claim 3 wherein said core is non-conductive.
Claim 7
Dependent Claim
23 words
The cylindrical fiber brush of claim 1 wherein said fibers are conductive having a resistivity of between 10 -6 and 10 9 ohm-cm.
Claim 8
Dependent Claim
23 words
The cylindrical fiber brush of claim 6 wherein said fibers have a resistivity of from about 10 3 to about 10 7 ohm-cm.
Claim 9
Dependent Claim
36 words
The cylindrical fiber brush of claim 1 wherein fiber fill density at the outermost pile ends at the strip edges is at least double the fiber fill density in the center portion of the fabric strip.
Claim 10
Dependent Claim
31 words
The cylindrical fiber brush of claim 1 wherein said fabric strip comprises a fabric backing with a plush pile, said backing forming a small flange on each side of the pile.
Claim 11
Dependent Claim
63 words
The cylindrical fiber brush of claim 9 wherein the abutment of the flanges of the spiral fabric strip between adjacent windings is imperfect thereby forming a space between the adjacent piles at the strip edges of at least 1 mm in width and wherein the increased fiber fill density at the fabric strip edges substantially fills this space at the adjacent pile ends.
Claim 12
Dependent Claim
56 words
The cylindrical fiber brush of claim 1 wherein said brush is a cleaning brush for an electrostatographic reproducing apparatus having a fiber fill density of about 14,000 to 40,000 fibers per square inch of from about 7 to about 25 denier per filament fibers and a pile height of from about 1/4 inch to 1 inch.
Claim 13
Dependent Claim
55 words
The cylindrical fiber brush of claim 1 wherein said brush is a charging brush for an electrostatographic reproducing apparatus having a fiber fill density of about 100,000 to 250,000 fibers per square inch of from about 7 to about 25 denier per filament fibers and a pile height of from about 0.1 to 0.5 inches.
Claim 14
Dependent Claim
28 words
The cylindrical fiber brush of claim 1 wherein said fibers of said brush are carbon filled rayon, carbon coated nylon, carbon filled nylon, carbonized polyacrylonitrile or stainless steel.
Claim 15
Independent Claim
112 words
An apparatus for cleaning an electrostatographic imaging member of residual toner comprising an elongated cylindrical core having bound thereto a spirally wound conductive pile fabric strip having a spiral seam between adjacent windings of said fabric strip, the fiber fill density of said fabric strip at the strip edges being at least double the fiber fill density in the center portion of the fabric strip; means for electrically biasing said brush to a polarity opposite to that of the charge on said toner and means to provide rotational contact of said brush fiber with said imaging member whereby said toner is attracted to said brush when said brush contacts said imaging member.
Claim 16
Independent Claim
112 words
An apparatus for cleaning an electrostatographic imaging member of residual toner comprising an elongated cylindrical core having bound thereto a spirally wound conductive pile fabric strip having a spiral seam between adjacent windings of said fabric strip, the fiber fill density of said fabric strip at the strip edges being at least double the fiber fill density in the center portion of the fabric strip; means for electrically biasing said brush to a polarity opposite to that of the charge on said toner and means to provide rotational contact of said brush fiber with said imaging member whereby said toner is attracted to said brush when said brush contacts said imaging member.
Claim 17
Dependent Claim
20 words
The apparatus of claim 14 including at least one insulative member adapted to contact said brush for removing toner therefrom.
Claim 18
Dependent Claim
19 words
The apparatus of claim 15 including blade means supported for contact with said insulative member for removing toner therefrom.
Claim 19
Dependent Claim
97 words
Apparatus for uniformly charging an electrostatographic imaging member comprising an elongated cylindrical core having bound thereto a spirally wound conductive pile fabric strip having a spiral seam between adjacent windings of said fabric strip, the fiber fill density of said fabric strip at the strip edges being at least double the fiber fill density in the center portion of the fabric strip; means for electrically biasing said brush to a polarity the same as the polarity of charge desired on said imaging member and; means to provide rotational contact of said brush fiber with said imaging member.
Claim 20
Dependent Claim
97 words
Apparatus for uniformly charging an electrostatographic imaging member comprising an elongated cylindrical core having bound thereto a spirally wound conductive pile fabric strip having a spiral seam between adjacent windings of said fabric strip, the fiber fill density of said fabric strip at the strip edges being at least double the fiber fill density in the center portion of the fabric strip; means for electrically biasing said brush to a polarity the same as the polarity of charge desired on said imaging member and; means to provide rotational contact of said brush fiber with said imaging 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) | 1990-11-16 | 1991-05-18 | 1991-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-16 | 1995-05-18 | 1995-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-16 | 1999-05-18 | 1999-11-17 | $7700.00 | Window Closed / Lapsed |