Patent US4924263A successfully refreshed from Google Patents.
US4924263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quality control for magnetic images
Assignee: Xerox Corp
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Filing: 1989-04-10
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Granted: 1990-05-08
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Expires: 2009-04-10
Abstract
Abstract A printing machine in which magnetically permeable marking particles develop a latent image recorded on a photoconductive member. A read head is positioned adjacent the photoconductive member to detect magnetic field intensity effects produced by the marking particles. In addition, an optical device may be used to transmit a light beam onto the marking particles developed on the latent image and to sense the intensity of the light rays reflected therefrom. The read head alone or in combination with the optical device, generates a control signal. The control signal may be used to regulate one of the processing stations of the printing machine.
Inventors
- 👤 Jan Bares
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:20
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0822; G03G15/0848; G03G15/0849; G03G15/0853; G03G15/50; G03G15/5033; G03G15/5041; G03G2215/00; G03G2215/00025; G03G2215/00029; G03G2215/00033; G03G2215/00037; G03G2215/00042; G03G2215/0013
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
53 words
A printing machine of the type in which magnetically permeable marking particles develop a latent image recorded on a member, wherein the improvement includes a read head positioned adjacent the member to detect magnetic field intensity effects produced by the marking particles developed on the member and, in response thereto, generates a signal.
Claim 2
Dependent Claim
53 words
A printing machine of the type in which magnetically permeable marking particles develop a latent image recorded on a member, wherein the improvement includes a read head positioned adjacent the member to detect magnetic field intensity effects produced by the marking particles developed on the member and, in response thereto, generates a signal.
Claim 3
Dependent Claim
28 words
A printing machine according to claim 1, wherein said read head is positioned adjacent the surface of the member opposed from the surface having the marking particles thereon.
Claim 4
Dependent Claim
22 words
A printing machine according to claim 2, further including means for recording a test patch as the latent image on the member.
Claim 5
Dependent Claim
43 words
A printing machine according to claim 1, further including optical means which transmits a light beam onto the marking particles developed on the test patch and which senses the intensity of the light rays reflected therefrom and, in response thereto, generates a signal.
Claim 6
Dependent Claim
40 words
A printing machine according to claim 4 in which the member moves the developed test patch, wherein the developed test patch includes a plurality of spaced lines with the lines being perpendicular to the direction of movement of the member.
Claim 7
Dependent Claim
34 words
A printing machine according to claim 5, wherein the marking particles developed on the test patch interact with said read head so that the signal generated by said read head is an AC signal.
Claim 8
Dependent Claim
33 words
A printing machine according to claim 6, wherein the marking particles developed on test patch interact with said optical means so that the signal generated by said optical means is an AC signal.
Claim 9
Dependent Claim
39 words
A printing machine according to claim 7, further including means, responsive to the signal from said read head and the signal from said optical means, for generating a control signal to regulate a processing station of the printing machine.
Claim 10
Dependent Claim
37 words
A printing machine according to claim 8, wherein said read head generates a substantially constant magnetic flux field and detects the variations of the magnetic flux field caused by the marking particles developed on the test patch.
Claim 11
Dependent Claim
28 words
A printing machine according to claim 8, wherein said read head magnetizes the marking particles and detects the intensity of the magnetic field generated by the marking particles.
Claim 12
Dependent Claim
60 words
A printing machine according to claim 8, wherein said optical means includes: a light source for transmitting light rays onto at least the marking particles developed on the test patch recorded on the member; and a light sensor for detecting the intensity of the light rays reflected from the marking particles developed on the test patch recorded on the member.
Claim 13
Dependent Claim
114 words
An electrophotographic printing machine of the type in which a latent image recorded on a moving photoconductive member is developed with magnetically permeable toner particles, wherein the improvement includes: means, positioned adjacent the photoconductive member, for detecting the magnetic field intensity effects produced by the toner particles developed on the photoconductive member and, in response thereto, generating a signal; means for transmitting a light beam onto the toner particles developed on the photoconductive member and which senses the intensity of the light rays reflected therefrom and, in response thereto, generates a signal; and means, responsive to the signal from said detecting means and the signal from said transmitting means, for generating a control signal.
Claim 14
Dependent Claim
114 words
An electrophotographic printing machine of the type in which a latent image recorded on a moving photoconductive member is developed with magnetically permeable toner particles, wherein the improvement includes: means, positioned adjacent the photoconductive member, for detecting the magnetic field intensity effects produced by the toner particles developed on the photoconductive member and, in response thereto, generating a signal; means for transmitting a light beam onto the toner particles developed on the photoconductive member and which senses the intensity of the light rays reflected therefrom and, in response thereto, generates a signal; and means, responsive to the signal from said detecting means and the signal from said transmitting means, for generating a control signal.
Claim 15
Dependent Claim
26 words
A printing machine according to claim 12, further including means, responsive to the toner particles being non-magnetic, for decoupling said control means from said detecting means.
Claim 16
Dependent Claim
30 words
A printing machine according to claim 12, wherein said detecting means is positioned adjacent the surface of the photoconductive member opposed from the surface thereof having the toner particles thereon.
Claim 17
Dependent Claim
24 words
A printing machine according to claim 14, further including means for recording a test patch as the latent image on the photoconductive member member.
Claim 18
Dependent Claim
32 words
A printing machine according to claim 15, wherein the developed test patch includes a plurality of spaced lines with the lines being perpendicular to the direction of movement of the photoconductive member.
Claim 19
Dependent Claim
34 words
A printing machine according to claim 16, wherein the toner particles developed on the test patch interact with said detecting means so that the signal generated by said detecting means is an AC signal.
Claim 20
Dependent Claim
33 words
A printing machine according to claim 17, wherein the toner particles developed on the test patch interact with said transmitting means so that the signal from said transmitting means is an AC signal.
Claim 21
Dependent Claim
28 words
A printing machine according to claim 18, wherein said detecting means magnetizes the toner particles and detects the intensity of the magnetic field generated by the toner particles.
Claim 22
Dependent Claim
36 words
A printing machine according to claim 18, wherein detects means generates a substantially constant magnetic flux field and detects the variations of the magnetic flux field caused by the toner particles developed on the test patch.
Claim 23
Dependent Claim
22 words
A printing machine according to claim 18, the control signal from said generating means regulates a processing station of the printing machine.
Claim 24
Dependent Claim
62 words
A printing machine according to claim 21, wherein said transmitting means includes: a light source for transmitting light rays onto at least the toner particles developed on the test patch recorded on the photoconductive member; and a light sensor for detecting the intensity of the light rays reflected from the toner particles developed on the test patch recorded on the photoconductive 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) | 1993-05-07 | 1993-11-06 | 1994-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-07 | 1997-11-06 | 1998-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-07 | 2001-11-06 | 2002-05-08 | $7700.00 | Window Closed / Lapsed |