US3684890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photosensitive misfeed detector
Assignee: Xerox Corp
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Filing: 1970-01-28
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Granted: 1972-08-15
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Expires: 1990-01-28
Abstract
Abstract A misfeed detector for sensing the presence of a properly fed sheet of support material prior to the sheet being conveyed to the photoconductive surface of a xerographic machine for transfer of a developed image thereto. A photocell system utilizes two reflections from an area where both a sheet should be located and a gripper member is situated to determine whether a sheet is correctly positioned to be conveyed for an image transfer. If a misfeed of the sheet is detected by the photocells, a shutdown of the xerographic machine is effected.
Inventors
- 👤 Thomas F Hayne
- 👤 Charles A Whited
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:48
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/70
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
162 words
An apparatus for detecting the non-feed and mis-feed of positioning of a sheet material supported on a conveying surface including energy beaming means to direct a plurality of energy beams against a conveying surface adapted to convey a sheet material to a utilization station, energy sensing means to sense the plurality of levels of energy produced by the plurality of energy beams directed against the conveying surface, control means responsive to the plurality of levels of energy sensed by the energy sensing means to indicate the feed and non-feed of positioning of a sheet material on the conveying surface upon the plurality of levels of energy being substantially equal to each other, and said control means further including a timing means to measure a pre-determined time interval beginning upon the application of power to said control means and again recommencing upon the sensing of an unequal energy level whereby the control means is conditioned prior to the beginning of each sensing cycle.
Claim 2
Independent Claim
162 words
An apparatus for detecting the non-feed and mis-feed of positioning of a sheet material supported on a conveying surface including energy beaming means to direct a plurality of energy beams against a conveying surface adapted to convey a sheet material to a utilization station, energy sensing means to sense the plurality of levels of energy produced by the plurality of energy beams directed against the conveying surface, control means responsive to the plurality of levels of energy sensed by the energy sensing means to indicate the feed and non-feed of positioning of a sheet material on the conveying surface upon the plurality of levels of energy being substantially equal to each other, and said control means further including a timing means to measure a pre-determined time interval beginning upon the application of power to said control means and again recommencing upon the sensing of an unequal energy level whereby the control means is conditioned prior to the beginning of each sensing cycle.
Claim 3
Dependent Claim
26 words
The apparatus of claim 1 wherein the energy beaming means directs two beams of raDiant energy against the conveying surface and a non-reflective member positioned thereon.
Claim 4
Dependent Claim
29 words
The apparatus of claim 2 wherein the energy sensing means senses the reflective level of the two beams of radiant energy from the conveying surface and the non-reflective member.
Claim 5
Dependent Claim
127 words
A detector apparatus for detecting the improper positioning of a sheet member on a conveying surface having a sheet securing means comprising a first energy means to direct a first beam of energy against the conveying surface, a second energy means to direct a second beam of energy against the sheet securing means, energy sensing means to sense the magnitudes of the energy produced by the first beam of energy and the second beam of energy directed against the conveying surface and the sheet securing means respectively, control means responsive to the relative magnitudes of energy sensed by the energy sensing means to indicate the improper positioning of a sheet material on the conveying surface upon the magnitudes of energy remaining balanced for a predetermined time interval.
Claim 6
Dependent Claim
127 words
A detector apparatus for detecting the improper positioning of a sheet member on a conveying surface having a sheet securing means comprising a first energy means to direct a first beam of energy against the conveying surface, a second energy means to direct a second beam of energy against the sheet securing means, energy sensing means to sense the magnitudes of the energy produced by the first beam of energy and the second beam of energy directed against the conveying surface and the sheet securing means respectively, control means responsive to the relative magnitudes of energy sensed by the energy sensing means to indicate the improper positioning of a sheet material on the conveying surface upon the magnitudes of energy remaining balanced for a predetermined time interval.
Claim 7
Dependent Claim
22 words
The apparatus of claim 4 wherein the first energy means and the second energy means each direct a beam of radiant energy.
Claim 8
Dependent Claim
42 words
The apparatus of claim 4 wherein the magnitude of energy produced by the second beam of energy is unequal to the magnitude of energy produced by the first beam of energy directed against the conveying surface having a properly positioned sheet material.
Claim 9
Dependent Claim
15 words
The apparatus of claim 4 wherein the time interval is measured by a timing circuit.
Claim 10
Dependent Claim
37 words
The apparatus of claim 4 wherein the conveying surface supporting a sheet member moves relative to the detector apparatus to produce unbalanced magnitudes of energy during the time interval upon the sensing of a properly positioned sheet.
Claim 11
Independent Claim
126 words
A method of sensing the presence of a properly positioned sheet of material being conveyed by a conveying surface including a sheet securing means comprising the steps directing a first beam of energy against a conveying surface having a first energy reflective level to produce a first magnitude of energy, directing a second beam of energy against a sheet securing means having a second energy reflective level to produce a second magnitude of energy, moving the surface and sheet securing means relative to the first and second energy beams, and sensing the proper positioning of a sheet of material on the conveying surface upon at least one of the first magnitude of energy and the second magnitude of energy changing value during a predetermined time interval.
Claim 12
Independent Claim
126 words
A method of sensing the presence of a properly positioned sheet of material being conveyed by a conveying surface including a sheet securing means comprising the steps directing a first beam of energy against a conveying surface having a first energy reflective level to produce a first magnitude of energy, directing a second beam of energy against a sheet securing means having a second energy reflective level to produce a second magnitude of energy, moving the surface and sheet securing means relative to the first and second energy beams, and sensing the proper positioning of a sheet of material on the conveying surface upon at least one of the first magnitude of energy and the second magnitude of energy changing value during a predetermined time interval.
References Cited (Backward Citations)
US2936886A
Cited
US3026419A
Cited
US3169476A
Cited
US3461248A
Cited
US3414732A
Cited
US3446978A
Cited
US3566132A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |