Patent US3593065A successfully refreshed from Google Patents.
US3593065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sheet detection apparatus
Assignee: Xerox Corp
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Filing: 1969-07-14
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Granted: 1971-07-13
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Expires: 1989-07-14
Abstract
Abstract Apparatus which inactivates a xerographic machine in response to a copy sheet misspuff. A sheet of paper remaining on the xerographic drum beyond the stripping station causes a change in light intensity at a photocell which receives reflected light from the drum. This intensity change results in a change in resistance within the circuit to cause a current flow through a capacitor. This, in turn, energizes a threshold switching means to energize a control relay to stop the machine.
Inventors
- 👤 Robert A Domalski
- 👤 Donald J Quant
- 👤 Richard C Kahler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:01
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/70; G03G15/706
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
424 words
Apparatus for use in detecting misfed sheets in an automatic xerographic reproducing machine and for inactivating the machine in response to detected misfed sheets including, control means adapted to permit the operation of the machine when said control means is in a first state and to shut down the machine when said control means is in a second state, threshold switching means coupled with said control means to control current flow through said control means, a light source positioned in the xerographic reproducing machine, photocell means electrically coupled with said threshold switching means and positioned in the xerographic reproducing machine to receive light from said light source and capacitor means coupled to said threshold switching means and said photocell means to prohibit the flow of current to said threshold switching means during normal operatons of the reproducing machine so that the control means may be held in its first state, the capacitor means also being adapted, when the resistance of said photocell means is rapidly decreased by the sensing of a misfed sheet in the xerographic reproducing machine to cause a flow of current to said threshold switching means whereby said threshold switching means conducts current to render said control means in its second state to thereby inactivate the xerographic reproducing machine. 2. A circuit for use in detecting misfed sheets in an automatic machine including control means adapted to permit operation of the machine when in a first state and to shut down the machine when in a second state, a threshold switching means coupled with said control means to control current flow through said control means, photocell means electrically coupled to said threshold switching means, capacitor means coupled to said threshold switching means and said photocell means to prohibit the flow of current to said threshold switching means during normal operations of the machine, said capacitor means also being adapted, when said photocell means changes resistance through the detection of a misfed sheet, to cause a circuit imbalance and flow current through said capacitor whereby said threshold switching means is energized to reverse the state of said control means, a voltage divided network to provide a stabilizing voltage to said capacitor for a predetermined time upon energization of the circuit, transistor means in series with said control means and said threshold switching means, said transistor means being in a nonconducting state prior to activation of the circuit and means to energize said transistor means a predetermined time after the energization of the circuit to thereafter permit current flow through said control means.
Claim 2
Dependent Claim
424 words
Apparatus for use in detecting misfed sheets in an automatic xerographic reproducing machine and for inactivating the machine in response to detected misfed sheets including, control means adapted to permit the operation of the machine when said control means is in a first state and to shut down the machine when said control means is in a second state, threshold switching means coupled with said control means to control current flow through said control means, a light source positioned in the xerographic reproducing machine, photocell means electrically coupled with said threshold switching means and positioned in the xerographic reproducing machine to receive light from said light source and capacitor means coupled to said threshold switching means and said photocell means to prohibit the flow of current to said threshold switching means during normal operatons of the reproducing machine so that the control means may be held in its first state, the capacitor means also being adapted, when the resistance of said photocell means is rapidly decreased by the sensing of a misfed sheet in the xerographic reproducing machine to cause a flow of current to said threshold switching means whereby said threshold switching means conducts current to render said control means in its second state to thereby inactivate the xerographic reproducing machine. 2. A circuit for use in detecting misfed sheets in an automatic machine including control means adapted to permit operation of the machine when in a first state and to shut down the machine when in a second state, a threshold switching means coupled with said control means to control current flow through said control means, photocell means electrically coupled to said threshold switching means, capacitor means coupled to said threshold switching means and said photocell means to prohibit the flow of current to said threshold switching means during normal operations of the machine, said capacitor means also being adapted, when said photocell means changes resistance through the detection of a misfed sheet, to cause a circuit imbalance and flow current through said capacitor whereby said threshold switching means is energized to reverse the state of said control means, a voltage divided network to provide a stabilizing voltage to said capacitor for a predetermined time upon energization of the circuit, transistor means in series with said control means and said threshold switching means, said transistor means being in a nonconducting state prior to activation of the circuit and means to energize said transistor means a predetermined time after the energization of the circuit to thereafter permit current flow through said control means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |