US4750018A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pre-transfer copy sheet cleaning apparatus
Assignee: Xerox Corp
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Filing: 1987-06-26
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Granted: 1988-06-07
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Expires: 2007-06-26
Abstract
Abstract A copier/printer having a transfer station for transferring images from an imaging member to copy sheets includes the improvement of removing debris from the surfaces of copy sheets facing the imaging member before the copy sheets reach the transfer station. At least a pair of cooperating rolls are positioned to form a nip for driving the copy sheets therebetween toward the transfer station. The cooperating rolls include a drive roll and a dielectric roll with the dielectric roll being electrostatically charged by the drive roll and paper through contact and separation during the intercopy gaps between copy sheets in transit to the transfer station through contact with the copy sheets to electrostatically attract debris from the copy sheets.
Inventors
- 👤 Arthur M. Gooray
- 👤 Dennis A. Abramsohn
- 👤 Stephen M. Borostyan
- 👤 Joseph Mammino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:39
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/65; G03G15/6555; G03G15/6558; G03G15/14; G03G15/16; G03G15/1695; G03G15/1665; G03G15/22; G03G15/23; G03G15/231; G03G15/232; G03G15/234; G03G15/235; G03G2215/00; G03G2215/00362; G03G2215/00367; G03G2215/00409; G03G2215/00535; G03G2215/00607; G03G2215/00679
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
126 words
In a copier/printer having a transfer station for transferring images from an imaging member to copy sheets, the improvement of removing debris from the surfaces of the copy sheets in particular facing the imaging member before the copy sheets reach the transfer station, characterized by: at least a pair of cooperating rolls positioned to form a nip for driving the copy sheets therebetween toward the transfer station, said at least a pair of cooperating rolls includes a drive roll and a dielectric roll with the dielectric roll being initially electrostatically charged by said drive roll through triboelectrification during the intercopy gaps between copy sheets in transit with the charging level being maintained by the copy sheets and positioned to electrostatically attract debris from the copy sheets.
Claim 2
Dependent Claim
126 words
In a copier/printer having a transfer station for transferring images from an imaging member to copy sheets, the improvement of removing debris from the surfaces of the copy sheets in particular facing the imaging member before the copy sheets reach the transfer station, characterized by: at least a pair of cooperating rolls positioned to form a nip for driving the copy sheets therebetween toward the transfer station, said at least a pair of cooperating rolls includes a drive roll and a dielectric roll with the dielectric roll being initially electrostatically charged by said drive roll through triboelectrification during the intercopy gaps between copy sheets in transit with the charging level being maintained by the copy sheets and positioned to electrostatically attract debris from the copy sheets.
Claim 3
Dependent Claim
18 words
The improvement of claim 1, including means for cleaning the copy sheet contacting surface of said dielectric roll.
Claim 4
Dependent Claim
16 words
The improvement of claim 2, wherein said means for cleaning said dielectric roll is a brush.
Claim 5
Dependent Claim
33 words
The improvement of claim 3, wherein said dielectric roll comprises an acetal polymer mounted on a shaft with a covering dielectric layer taken from a group consisting of acrylic, fluorocarbon, polyurethane, epoxy, etc..
Claim 6
Dependent Claim
13 words
The improvement of claim 4, wherein said drive roll is made of rubber.
Claim 7
Dependent Claim
21 words
The improvement of claim 5, wherein said rubber drive roll is selected from a group consisting of butyl, polyisoprene, neoprene, etc..
Claim 8
Dependent Claim
114 words
In a printer apparatus having a transfer station for transferring images from an imaging member to copy sheets, the improvement of removing debris from the surfaces of the copy sheets facing the imaging member before the copy sheets reach the transfer station, characterized by: at least a pair of cooperating rolls positioned to form a nip for driving the copy sheets therebetween toward the transfer station, said at least a pair of cooperating rolls includes a drive roll and a metal roll having a dielectric coating with the dielectric coating being charged by an energy source which biases said metal roll, and means for cleaning the copy sheet contacting surface of said dielectric coating.
Claim 9
Dependent Claim
114 words
In a printer apparatus having a transfer station for transferring images from an imaging member to copy sheets, the improvement of removing debris from the surfaces of the copy sheets facing the imaging member before the copy sheets reach the transfer station, characterized by: at least a pair of cooperating rolls positioned to form a nip for driving the copy sheets therebetween toward the transfer station, said at least a pair of cooperating rolls includes a drive roll and a metal roll having a dielectric coating with the dielectric coating being charged by an energy source which biases said metal roll, and means for cleaning the copy sheet contacting surface of said dielectric coating.
Claim 10
Dependent Claim
120 words
In a copier/printer having a transfer station for transferring images from an imaging member to copy sheets, the improvement of removing debris from the surfaces of the copy sheets facing the imaging member before the copy sheets reach the transfer station in order to prevent toner contamination, characterized by: at least a pair of cooperating rolls positioned to form a nip for driving the copy sheets therebetween toward the transfer station, said at least a pair of cooperating rolls includes a drive roll and a dielectric roll, and charging means in the form of a small roll adapted to contact and charge said dielectric roll such that debris will be electrostatically attracted to the dielectric roll from the copy sheets.
Claim 11
Dependent Claim
120 words
In a copier/printer having a transfer station for transferring images from an imaging member to copy sheets, the improvement of removing debris from the surfaces of the copy sheets facing the imaging member before the copy sheets reach the transfer station in order to prevent toner contamination, characterized by: at least a pair of cooperating rolls positioned to form a nip for driving the copy sheets therebetween toward the transfer station, said at least a pair of cooperating rolls includes a drive roll and a dielectric roll, and charging means in the form of a small roll adapted to contact and charge said dielectric roll such that debris will be electrostatically attracted to the dielectric roll from the copy sheets.
Claim 12
Dependent Claim
33 words
The improvement of claim 8, wherein said dielectric roll comprises an acetal polymer mounted on a shaft with a covering dielectric layer taken from a group consisting of acrylic, fluorocarbon, polyurethane, epoxy, etc.
Claim 13
Dependent Claim
13 words
The improvement of claim 9, wherein said drive roll is made of rubber.
Claim 14
Dependent Claim
21 words
The improvement of claim 10, wherein said rubber drive roll is made from a group consisting of butyl, polyisoprene, neoprene, etc.
Claim 15
Dependent Claim
19 words
The improvement of claim 8, wherein charging of said dielectric roll is by contact and separation in said nip.
Claim 16
Dependent Claim
13 words
The improvement of claim 12, wherein slip is denuminus between said cooperating rolls.
Claim 17
Dependent Claim
30 words
The improvement in claim 1, wherein charging of said dielectric roll is accompished through contact and separation with said drive roll and through contact with and separation from copy sheets.
Claim 18
Dependent Claim
126 words
In a copier/printer having a transfer station for transferring images from an imaging member to copy sheets, the improvement of removing debris from the surfaces of the copy sheets in particular facing the imaging member before the copy sheets reach the transfer station, characterized by: at least a pair of cooperating rolls positioned to form a nip for driving the copy sheets therebetween toward the transfer station, said at least a pair of cooperating rolls includes a drive roll and a dielectric roll with the dielectric roll being charged by said drive roll through contact and separation during the intercopy gaps between copy sheets in transit with the charging level being maintained by the copy sheets and positioned to electrostatically attract debris from the copy sheets.
Claim 19
Dependent Claim
126 words
In a copier/printer having a transfer station for transferring images from an imaging member to copy sheets, the improvement of removing debris from the surfaces of the copy sheets in particular facing the imaging member before the copy sheets reach the transfer station, characterized by: at least a pair of cooperating rolls positioned to form a nip for driving the copy sheets therebetween toward the transfer station, said at least a pair of cooperating rolls includes a drive roll and a dielectric roll with the dielectric roll being charged by said drive roll through contact and separation during the intercopy gaps between copy sheets in transit with the charging level being maintained by the copy sheets and positioned to electrostatically attract debris from the copy sheets.
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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) | 1991-06-07 | 1991-12-07 | 1992-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-07 | 1995-12-07 | 1996-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-07 | 1999-12-07 | 2000-06-07 | $7700.00 | Window Closed / Lapsed |