US3693969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic apparatus
Assignee: Canon Inc
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Filing: 1971-01-25
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Granted: 1972-09-26
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Expires: 1991-01-25
Abstract
Abstract A device for detecting the jamming of copy material in a photocopying machine or the like is provided which can detect not only jamming of copy material occured at any portion of the whole path thereof but also jamming occured in a particular device or station where the jamming tends to occur or causes a serious dangerous condition. The actual time intervals required for copy material to pass through the whole path and through the particular station are compared with the reference time intervals respectively so that when the actual time intervals are longer than the reference time intervals, a warning signal is generated. The warning signal may be used to automatically stop the operation of the photocopying machine or its particular station such as a fixing station in order to prevent a fire hazard.
Inventors
- 👤 Hisashi Sakamaki
- 👤 Yoshimasa Kimura
- 👤 Osamu Sawamura
- 👤 Susumo Sugiura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:28
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/70
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
115 words
A device for detecting the jamming of copy material in a photocopying machine or the like comprising means for transporting copy material along a predetermined path through said machine, sensing means disposed in the path of said copy material, timer means for counting a reference time interval required for said copy material to pass through said sensing means under normal conditions, said timer means including means for initiating said reference time interval as a leading edge of said copy material passes through said sensing means, and means for generating an output signal when the actual time interval required by said copy material to pass through said sensing means is longer than said reference time interval.
Claim 2
Independent Claim
115 words
A device for detecting the jamming of copy material in a photocopying machine or the like comprising means for transporting copy material along a predetermined path through said machine, sensing means disposed in the path of said copy material, timer means for counting a reference time interval required for said copy material to pass through said sensing means under normal conditions, said timer means including means for initiating said reference time interval as a leading edge of said copy material passes through said sensing means, and means for generating an output signal when the actual time interval required by said copy material to pass through said sensing means is longer than said reference time interval.
Claim 3
Independent Claim
150 words
A device for detecting the jamming of copy material in a photocopYing machine or the like comprising means for transporting copy material along a predetermined path through said machine, means for feeding said copy material to said transporting means, a first switching means, control means for actuating said first switching means in response to actuation of said feeding means, timer means actuated in response to the actuation of said first switching means for counting a reference time interval Ts required for said copy material to pass along the whole length of said predetermined path, second switching means disposed at the end of said predetermined path of said copy material, and means for generating an output signal when a time interval from the time when said first switching means is actuated to the time when said copy material actuates said second switching means is longer than said reference time interval Ts.
Claim 4
Independent Claim
150 words
A device for detecting the jamming of copy material in a photocopYing machine or the like comprising means for transporting copy material along a predetermined path through said machine, means for feeding said copy material to said transporting means, a first switching means, control means for actuating said first switching means in response to actuation of said feeding means, timer means actuated in response to the actuation of said first switching means for counting a reference time interval Ts required for said copy material to pass along the whole length of said predetermined path, second switching means disposed at the end of said predetermined path of said copy material, and means for generating an output signal when a time interval from the time when said first switching means is actuated to the time when said copy material actuates said second switching means is longer than said reference time interval Ts.
Claim 5
Dependent Claim
29 words
The device according to claim 1, wherein said sensing means comprises a light source, and a photo-responsive element opposed to said light source and connected to said timer means.
Claim 6
Dependent Claim
38 words
The device according to claim 1, wherein said machine includes means for fixing an image produced on said copy paper, and wherein said sensing means is disposed in the vicinity of a discharge end of said fixing means.
Claim 7
Independent Claim
250 words
A device for detecting the jamming of copy material for use in a photocopying machine or the like comprising means for transporting copy material along a predetermined path through said machine, means for feeding said copy material to said transporting means, first switching means, control means for actuating said first switching means in response to actuation of said feeding means, first timer means actuated in response to the actuation of said first switching means for counting a reference time interval Ts required for said copy material to pass along the whole length of said predetermined path, second switching means disposed at the end of said predetermined path of said copy material, first output generating means for generating a first output signal when a time interval To from the time when said first switching means is actuated to the time when said copy material actuates said second switching means is longer than said reference time interval Ts, sensing means disposed adjacent the end of said predetermined path of said copy material, second timer means for counting a reference time interval Ts'' required for said copy material to pass through said sensing means under normal conditions, second output generating means for generating a second output signal when a time interval T required for said copy material to pass through said sensing means is longer than said second reference time interval Ts'', and means for generating a warning signal when either of said first or second output generating means generates a said output.
Claim 8
Independent Claim
250 words
A device for detecting the jamming of copy material for use in a photocopying machine or the like comprising means for transporting copy material along a predetermined path through said machine, means for feeding said copy material to said transporting means, first switching means, control means for actuating said first switching means in response to actuation of said feeding means, first timer means actuated in response to the actuation of said first switching means for counting a reference time interval Ts required for said copy material to pass along the whole length of said predetermined path, second switching means disposed at the end of said predetermined path of said copy material, first output generating means for generating a first output signal when a time interval To from the time when said first switching means is actuated to the time when said copy material actuates said second switching means is longer than said reference time interval Ts, sensing means disposed adjacent the end of said predetermined path of said copy material, second timer means for counting a reference time interval Ts'' required for said copy material to pass through said sensing means under normal conditions, second output generating means for generating a second output signal when a time interval T required for said copy material to pass through said sensing means is longer than said second reference time interval Ts'', and means for generating a warning signal when either of said first or second output generating means generates a said output.
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) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |