US5075734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sheet transport system with improved registration
Assignee: Xerox Corp
•
Filing: 1990-12-20
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Granted: 1991-12-24
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Expires: 2010-12-20
Abstract
Abstract An apparatus which advances a sheet through a transfer zone and into registration with information developed on a moving member. The sheet is advanced to a position wherein a leading portion thereof is within the transfer zone and a trailing portion thereof is immediately behind the transfer zone relative to the forward direction of movement of the moving member. The leading portion of the sheet is advanced through the transfer zone at a first velocity and the trailing portion of the sheet is advanced in a region immediately behind the transfer zone at a second velocity, which is greater than the first velocity, so as to create a buckle in the trailing portion of the sheet in the region. The buckle functions to eliminate relative velocity between the photoconductive belt and any portion of sheet within the transfer zone so as to substantially eliminate slip between the sheet and the photoconductive belt.
Inventors
- 👤 Scott C. Durland
- 👤 James R. Cassano
- 👤 Richard M. Dastin
- 👤 Michele D. Taber
- 👤 Vittorio Castelli
- 👤 Daniel R. Shavers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:22
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/65; G03G15/6529; B; B65; B65H; B65H29/00; B65H29/02; B65H29/04; B65H29/042; G03G15/14; G03G15/16; G03G15/163; G03G15/1635; G03G15/165; G03G15/1655; G03G2215/00; G03G2215/00362; G03G2215/00919; G03G2215/00945
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
95 words
An apparatus for advancing a sheet through a transfer zone and into registration with information developed on a moving member, comprising: means for advancing the sheet through the transfer zone; means, acting in unison with said advancing means and positioned in a region immediately behind the transfer zone relative to the forward of direction of movement of the moving member, for eliminating relative velocity between the moving member and any portion of the sheet in the transfer zone so as to substantially eliminate slip between the sheet and the moving member in the transfer zone.
Claim 2
Independent Claim
95 words
An apparatus for advancing a sheet through a transfer zone and into registration with information developed on a moving member, comprising: means for advancing the sheet through the transfer zone; means, acting in unison with said advancing means and positioned in a region immediately behind the transfer zone relative to the forward of direction of movement of the moving member, for eliminating relative velocity between the moving member and any portion of the sheet in the transfer zone so as to substantially eliminate slip between the sheet and the moving member in the transfer zone.
Claim 3
Dependent Claim
21 words
The apparatus of claim 1, wherein said eliminating means forms a buckle in a portion of the sheet in the region.
Claim 4
Dependent Claim
55 words
The apparatus of claim 2, wherein: said advancing means advances a leading portion of the sheet at a first velocity in the transfer zone; and said eliminating means advances the trailing portion of the sheet at a second velocity, which is greater than the first velocity, in the region so as to form the buckle.
Claim 5
Dependent Claim
33 words
The apparatus of claim 2, wherein said eliminating means comprises a rotatable substantially hollow roller having a plurality of vacuum ports on its surface, said roller further having a vacuum source attached thereto.
Claim 6
Dependent Claim
11 words
The apparatus of claim 4, wherein said vacuum source is stationary.
Claim 7
Dependent Claim
20 words
The apparatus of claim 4, wherein said vacuum source is applied to a segment of the surface of said roller.
Claim 8
Dependent Claim
17 words
The apparatus of claim 6, wherein the segment comprises about 110° of the surface of said roller.
Claim 9
Dependent Claim
106 words
A printing machine of the type having a toner image developed on a moving member with a sheet being advanced through a transfer zone and into registration with the toner image, comprising: means for advancing the sheet through the transfer zone; means, acting in unison with said advancing means and positioned in a region immediately behind the transfer zone relative to the forward of direction of movement of the moving member, for eliminating relative velocity between the moving member and any portion of the sheet in the transfer zone so as to substantially eliminate slip between the sheet and the moving member in the transfer zone.
Claim 10
Dependent Claim
106 words
A printing machine of the type having a toner image developed on a moving member with a sheet being advanced through a transfer zone and into registration with the toner image, comprising: means for advancing the sheet through the transfer zone; means, acting in unison with said advancing means and positioned in a region immediately behind the transfer zone relative to the forward of direction of movement of the moving member, for eliminating relative velocity between the moving member and any portion of the sheet in the transfer zone so as to substantially eliminate slip between the sheet and the moving member in the transfer zone.
Claim 11
Dependent Claim
22 words
The printing machine of claim 8, wherein said eliminating means forms a buckle in a portion of the sheet in the region.
Claim 12
Dependent Claim
56 words
The printing machine of claim 9, wherein: said advancing means advances a leading portion of the sheet at a first velocity in the transfer zone; and said eliminating means advances the trailing portion of the sheet at a second velocity, which is greater than the first velocity, in the region so as to form the buckle.
Claim 13
Dependent Claim
34 words
The printing machine of claim 9, wherein said eliminating means comprises a rotatable substantially hollow roller having a plurality of vacuum ports on its surface, said roller further having a vacuum source attached thereto.
Claim 14
Dependent Claim
12 words
The printing machine of claim 11, wherein said vacuum source is stationary.
Claim 15
Dependent Claim
21 words
The printing machine of claim 11, wherein said vacuum source is applied to a segment of the surface of said roller.
Claim 16
Dependent Claim
18 words
The printing machine of claim 13, wherein the segment comprises about 110° of the surface of said roller.
Claim 17
Dependent Claim
28 words
The printing machine of claim 8, wherein each of a plurality of toner images are successively developed on the moving member and advanced into registration with the sheet.
Claim 18
Dependent Claim
16 words
The printing machine of claim 15, wherein each of the toner images is a different color.
References Cited (Backward Citations)
US4118025A
Cited
US4421306A
Cited
US4441390A
Cited
US4558944A
Cited
US4697512A
Cited
US4669853A
Cited
US4941021A
Cited
US4849795A
Cited
US4928141A
Cited
US4905052A
Cited
US5012290A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-23 | 1995-06-24 | 1995-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-23 | 1999-06-24 | 1999-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-23 | 2003-06-24 | 2003-12-24 | $7700.00 | Window Closed / Lapsed |