US3609737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for article detection utilizing corona discharge
Assignee: Xerox Corp
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Filing: 1968-06-28
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Granted: 1971-09-28
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Expires: 1988-06-28
Abstract
Abstract A sensor for detecting the presence or absence of support material passing in a predetermined path of movement. The sensor comprises a pair of spaced electrodes positioned adjacent the path of support material movement with the support material passing therebetween. The electrodes are supported by a suitable insulator and the spacing and voltage differential therebetween predetermined to generate a current which indicates the presence or absence of a support material passing between the electrodes. The output from the sensors is coupled to a suitable detector to control the operation of the automatic xerographic reproducing machine in accordance with the passage of the support material.
Inventors
- 👤 Martin Howard Lustig
- 👤 Norman Robert Lafond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:12
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/65; G01; G01V; G01V3/00; G01V3/02; G01V3/04; G03G2215/00; G03G2215/00362; G03G2215/00367; G03G2215/00371; G03G2215/00409; G03G2215/00413; G03G2215/00535; G03G2215/00548; G03G2215/00611; G03G2215/00632; G03G2215/00717; G03G2215/00721
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
226 words
Apparatus for detecting the passage of an article along a predetermined path of movement comprising: means for transporting an article along a predetermined path of movement extending into and out of a processing station said article being acted upon while in said processing station, first switch means positioned at the entrance to said processing station and adapted to be actuated by said article passing in operative contact therewith, second switch means positioned at the exit of said processing station and adapted to be actuated by said article passing in operative contact therewith said first and second switch means each comprising a pair of spaced electrodes having a current flow therebetween and positioned in said path of movement so that an article transported therealong passes between said electrodes, a control circuit electrically coupled to said first and second switch means comprising bistable means actuable to generate a first output signal in response to said article passing between the electrodes of said first switch means and a second output signal in response to said article passing between the electrodes of said second switch means, and timing means actuable in response to said first output signal of said bistable means for generating a signal indicative of the failure of said article to pass through said processing station when said first output signal continues for a predetermined lapse of time.
Claim 2
Dependent Claim
226 words
Apparatus for detecting the passage of an article along a predetermined path of movement comprising: means for transporting an article along a predetermined path of movement extending into and out of a processing station said article being acted upon while in said processing station, first switch means positioned at the entrance to said processing station and adapted to be actuated by said article passing in operative contact therewith, second switch means positioned at the exit of said processing station and adapted to be actuated by said article passing in operative contact therewith said first and second switch means each comprising a pair of spaced electrodes having a current flow therebetween and positioned in said path of movement so that an article transported therealong passes between said electrodes, a control circuit electrically coupled to said first and second switch means comprising bistable means actuable to generate a first output signal in response to said article passing between the electrodes of said first switch means and a second output signal in response to said article passing between the electrodes of said second switch means, and timing means actuable in response to said first output signal of said bistable means for generating a signal indicative of the failure of said article to pass through said processing station when said first output signal continues for a predetermined lapse of time.
Claim 3
Dependent Claim
40 words
The apparatus of claim 1 wherein said bistable means is disabled by said article passing between the electrodes of said second switch means said bistable means thence providing a second output signal to stop the running of said timing means.
Claim 4
Dependent Claim
18 words
The apparatus of claim 2 wherein said first and second switch means are spaced approximately one-half inch apart.
Claim 5
Dependent Claim
25 words
The apparatus of claim 3 wherein said apparatus includes an approximately 1,000 ohm resistor in series with each of said first and second switch means.
Claim 6
Dependent Claim
149 words
Apparatus for detecting the passage of an article from the input side of a processing station to the output side of said processing station comprising: support means carrying a first and second pair of oppositely positioned needlepoint electrodes, each of said pair of needlepoint electrodes being spaced a predetermined distance apart, a voltage source coupled to said electrodes for maintaining a predetermined current flow between said first and second pair of electrodes, bistable means responsive to a change in current through said first and second pair of electrodes for changing from a first state to a second state and back to a first state upon the passage of said article through said processing station, and timing means coupled to said bistable means for indicating failure of said article to exit from said pRocessing station when said bistable means remains in said second state for a predetermined lapse of time.
Claim 7
Dependent Claim
149 words
Apparatus for detecting the passage of an article from the input side of a processing station to the output side of said processing station comprising: support means carrying a first and second pair of oppositely positioned needlepoint electrodes, each of said pair of needlepoint electrodes being spaced a predetermined distance apart, a voltage source coupled to said electrodes for maintaining a predetermined current flow between said first and second pair of electrodes, bistable means responsive to a change in current through said first and second pair of electrodes for changing from a first state to a second state and back to a first state upon the passage of said article through said processing station, and timing means coupled to said bistable means for indicating failure of said article to exit from said pRocessing station when said bistable means remains in said second state for a predetermined lapse of time.
Claim 8
Dependent Claim
35 words
The apparatus of claim 5 wherein said voltage means coupled to each of said first and second switch means maintains an approximately 6,000 volt potential between the electrodes of said first and second switch means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |