US3878540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paper feed stoppage detection means in an electronic photocopying machine
Assignee: Minolta Co Ltd
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Filing: 1973-10-01
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Granted: 1975-04-15
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Expires: 1993-10-01
Abstract
Abstract A plurality of sensors detect the passage of a sheet of copying paper through a copying machine. A plurality of storage circuits having set and reset states are associated with the sensors. Each sensor, on detecting the paper, sets its associated storage circuit and resets the preceding storage circuit. Timers actuate an alarm if any storage circuit remains set longer than a predetermined time and indicator lights show which storage circuit is set. In order to allow for variable exposure times, one of the storage circuits is set by detection of the paper at the exposure position and is reset by the start of the exposure. The next storage circuit is set by the termination of the exposure and reset by detection of the paper''s leaving the exposure position. Thus the paper may remain at the exposure position for any length of time without producing an alarm as long as exposure is in process.
Inventors
- 👤 Yoshihisa Kawai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:33
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/70
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
303 words
A paper jam detecting means for use in an electrophotographic copying machine and the like, comprising: a plurality of detectors located at various points along the path of travel of a sheet of copying paper through said machine, each of said detectors producing an output signal upon detection of passage of a sheet of copying paper; a plurality of storage circuits, each having set and reset states and producing an output signal only when in the set state, a first of said plurality of storage circuits being set by an input signal supplied thereto at the start of feed of a sheet of copying paper, a first of said plurality of detectors operatively coupled thereto, whereby said first storage circuit is reset by the output of said first detector, a second of said plurality of storage circuits operatively coupled to a detector located at the entrance to an exposure chamber and adapted to be reset by an input signal generated upon the commencement of exposure of a sheet of copying paper, a third of said plurality of storage circuits operatively coupled to a detector located at the exit of the exposure chamber and adapted to be set by a signal generated upon completion of exposure of the sheet of copying paper, the remaining ones of said plurality of storage circuits each operatively coupled to two successive detectors, one detector setting said storage circuit, thereby producing an output signal, the second detector resetting said storage circuit thereof; a plurality of timers, each coupled to one of said storage circuits and activated by the output thereof, each of said timers producing an output if actuated for more than a predetermined time; and alarm means coupled to all of said timers and adapted to be actuated by an output signal of any one of said timers.
Claim 2
Dependent Claim
303 words
A paper jam detecting means for use in an electrophotographic copying machine and the like, comprising: a plurality of detectors located at various points along the path of travel of a sheet of copying paper through said machine, each of said detectors producing an output signal upon detection of passage of a sheet of copying paper; a plurality of storage circuits, each having set and reset states and producing an output signal only when in the set state, a first of said plurality of storage circuits being set by an input signal supplied thereto at the start of feed of a sheet of copying paper, a first of said plurality of detectors operatively coupled thereto, whereby said first storage circuit is reset by the output of said first detector, a second of said plurality of storage circuits operatively coupled to a detector located at the entrance to an exposure chamber and adapted to be reset by an input signal generated upon the commencement of exposure of a sheet of copying paper, a third of said plurality of storage circuits operatively coupled to a detector located at the exit of the exposure chamber and adapted to be set by a signal generated upon completion of exposure of the sheet of copying paper, the remaining ones of said plurality of storage circuits each operatively coupled to two successive detectors, one detector setting said storage circuit, thereby producing an output signal, the second detector resetting said storage circuit thereof; a plurality of timers, each coupled to one of said storage circuits and activated by the output thereof, each of said timers producing an output if actuated for more than a predetermined time; and alarm means coupled to all of said timers and adapted to be actuated by an output signal of any one of said timers.
Claim 3
Dependent Claim
59 words
A paper jam detection means as claimed in claim 1, further comprising a plurality of indicating means each associated with a respective one of said storage circuits, said indicating means adapted to be energized when a corresponding storage circuit is set and to be deenergized when reset, whereby indication is provided of an exact position where jamming has occurred.
Claim 4
Dependent Claim
222 words
A paper jam detection means in an electrophotographic copying machine and the like, comprising: a plurality of detectors provided on a feed path of copying papers through said machine, at least one of said detectors located at the entrance of an exposure chamber and a second detector located at the exit of the exposure chamber, each of said detectors adapted to sense the arrival of a sheet of copying paper and producing an output responsive thereto; a plurality of storage circuits associated with said detectors; a plurality of timers, each associated with a respective one of said storage circuits, one of said storage circuits coupled to said detector located at the entrance of the exposure chamber and adapted to be set by a signal from said detector to actuate the associated timer and adapted to be reset by a signal indicating the commencement of exposure, another of said storage circuits coupled to the detector located at the exit of the exposure chamber and adapted to be set by a signal indicating the completion of exposure to actuate the associated timer and adapted to be reset by a signal from said detector; and a warning means coupled to each of said timers, said means being actuated with any of said storage circuits fails to be reset within a time set by said timers.
Claim 5
Dependent Claim
222 words
A paper jam detection means in an electrophotographic copying machine and the like, comprising: a plurality of detectors provided on a feed path of copying papers through said machine, at least one of said detectors located at the entrance of an exposure chamber and a second detector located at the exit of the exposure chamber, each of said detectors adapted to sense the arrival of a sheet of copying paper and producing an output responsive thereto; a plurality of storage circuits associated with said detectors; a plurality of timers, each associated with a respective one of said storage circuits, one of said storage circuits coupled to said detector located at the entrance of the exposure chamber and adapted to be set by a signal from said detector to actuate the associated timer and adapted to be reset by a signal indicating the commencement of exposure, another of said storage circuits coupled to the detector located at the exit of the exposure chamber and adapted to be set by a signal indicating the completion of exposure to actuate the associated timer and adapted to be reset by a signal from said detector; and a warning means coupled to each of said timers, said means being actuated with any of said storage circuits fails to be reset within a time set by said timers.
Claim 6
Dependent Claim
78 words
A paper jam detection means as claimed in claim 3 wherein each of said storage circuits includes a set input terminal, a reset input terminal and a first output terminal, whereby each storage circuit may be set by the application of a signal to the set input terminal to actuate a corresponding one of the timers through the output terminal and whereby the circuit may be reset by the application of a signal to the reset input terminal.
Claim 7
Dependent Claim
42 words
A paper jam detection means as claimed in claim 4, wherein each of said storage circuits further includes a second output terminal connected to a lamp, said lamp being energized when said circuit is set and deenergized when said circuit is reset.
Claim 8
Dependent Claim
153 words
A paper jam detection means as claimed in claim 3 wherein the setting time for the timer associated with the storage circuit corresponding to the detector located at the entrance of the exposure chamber is determined by T1 (l1/S1) + Alpha 1 wherein T1 is the setting time, l1 is the distance from said detector to the exposure position, S1 is the trAveling speed of a copying paper over said distance l1 and Alpha 1 is a suitable time allowance and wherein the setting time for the timer associated with the storage circuit corresponding to the detector located at the exit of the exposure chamber and is determined by T2 (l2 /S2) + Alpha 2 wherein T2 is the setting time, l2 is the distance from the exposure position to said detector, S2 is the travelling speed of a copying paper for said distance l2 and Alpha 2 is a suitable time allowance.
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) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |