US4563086A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copy quality monitoring for magnetic images
Assignee: Xerox Corp
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Filing: 1984-10-22
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Granted: 1986-01-07
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Expires: 2004-10-22
Abstract
Abstract An electrophotographic printing machine in which a magnetic toner image is transferred to a copy sheet from a photoconductive member and fused thereto. The toner image fused to the copy sheet is magnetized and the intensity of the magnetic field generated by the toner image detected to provide a continuous indication of the quality of the toner image fused to the copy sheet.
Inventors
- 👤 John F. Knapp
- 👤 Robert J. Gruber
- 👤 Steven B. Bolte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:34
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/50; G03G15/5062; G03G2215/00; G03G2215/00025; G03G2215/0013
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
83 words
An electrophotographic printing machine of the type in which a magnetic toner image is transferred to a copy sheet from a photoconductive member and fused thereto, including: means for magnetizing the toner image fused to the copy sheet; and means for detecting the intensity of the magnetic field generated by the toner image fused to the copy sheet with the magnetic field intensity being proportional to the ratio of the mass of toner particles to area of toner particles on the copy sheet.
Claim 2
Dependent Claim
83 words
An electrophotographic printing machine of the type in which a magnetic toner image is transferred to a copy sheet from a photoconductive member and fused thereto, including: means for magnetizing the toner image fused to the copy sheet; and means for detecting the intensity of the magnetic field generated by the toner image fused to the copy sheet with the magnetic field intensity being proportional to the ratio of the mass of toner particles to area of toner particles on the copy sheet.
Claim 3
Dependent Claim
50 words
A printing machine according to claim 1, further including means for comparing the intensity of the magnetic field detected by said detecting means and being generated by the toner image to a reference for providing a continuous monitor of the quality of the toner image fused to the copy sheet.
Claim 4
Dependent Claim
17 words
A printing machine according to claim 2, wherein the copy sheet is a continuous web of paper.
Claim 5
Dependent Claim
52 words
A printing machine according to claim 3, further including means for forming a magnetic toner sample on the web of copy paper in the region between adjacent toner images, said magnetizing means magnetizing the toner sample and said detecting means sensing the intensity of the magnetic field generated by the toner sample.
Claim 6
Dependent Claim
37 words
A printing machine according to claim 4, further including means, responsive to the intensity of the magnetic field sensed by said sensing means, for generating a control signal to regulate a processing station of the printing machine.
Claim 7
Dependent Claim
19 words
A printing machine according to claim 5, wherein said generating means controls the processing station charging the photoconductive member.
Claim 8
Dependent Claim
23 words
A printing machine according to claim 5, wherein said generating means controls the processing station exposing the charged portion of the photoconductive member.
Claim 9
Dependent Claim
22 words
A printing machine according to claim 5, wherein said generating means controls the processing station discharging toner particles into the developer mixture.
Claim 10
Dependent Claim
28 words
A printing machine according to claim 5, wherein said generating means controls the processing station depositing toner particles onto the photoconductive member to form the toner image thereon.
Claim 11
Dependent Claim
27 words
A printing machine according to claim 5, wherein said generating means controls the processing station transferring the toner image from the photoconductive member to the copy sheet.
Claim 12
Independent Claim
74 words
An apparatus for monitoring the quality of a magnetic toner image fused to a copy sheet, including: mean for magnetizing the toner image fused to the copy sheet; and means for detecting the intensity of the magnetic field generated by the toner image fused to the copy sheet with the magnetic field intensity being proportional to the ratio of the mass of toner particles to the area of toner particles on the copy sheet.
Claim 13
Independent Claim
74 words
An apparatus for monitoring the quality of a magnetic toner image fused to a copy sheet, including: mean for magnetizing the toner image fused to the copy sheet; and means for detecting the intensity of the magnetic field generated by the toner image fused to the copy sheet with the magnetic field intensity being proportional to the ratio of the mass of toner particles to the area of toner particles on the copy sheet.
Claim 14
Dependent Claim
49 words
An apparatus according to claim 11, further including means for comparing the intensity of the magnetic field detected by said detecting means and being generated by the toner image to a reference for providing a continuous monitor of the quality of the toner image fused to the copy sheet.
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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) | 1989-01-06 | 1989-07-08 | 1990-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-06 | 1993-07-08 | 1994-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-06 | 1997-07-08 | 1998-01-07 | $7700.00 | Window Closed / Lapsed |