Patent US4125326A successfully refreshed from Google Patents.
US4125326A
Expired / Lapsed
US
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Paper feed cut off for photographic printer
Assignee: Pako Corp
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Filing: 1977-03-11
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Granted: 1978-11-14
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Expires: 1997-03-11
Abstract
Abstract A photographic printer has a paper feed system for automatically advancing print paper by a predetermined feed length after each exposure. A paper feed cut off circuit terminates the paper feed after a predetermined time period in the event that the paper feed has not been previously terminated. This prevents waste of large amounts of print paper in the event of a malfunction in the automatic paper feed system.
Inventors
- 👤 Victor R. Baert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:59
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/46; G03B27/462; G03B27/52; G03B27/58; G03B27/587
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
63 words
In a photographic printer having a paper feed system for advancing print paper by a predetermined feed length after each exposure, the improvement comprising: paper feed cut off means for terminating paper feed after a predetermined period if paper feed has not been previously terminated, wherein the predetermined period exceeds the time normally required for advancing the print paper the predetermined feed length.
Claim 2
Dependent Claim
63 words
In a photographic printer having a paper feed system for advancing print paper by a predetermined feed length after each exposure, the improvement comprising: paper feed cut off means for terminating paper feed after a predetermined period if paper feed has not been previously terminated, wherein the predetermined period exceeds the time normally required for advancing the print paper the predetermined feed length.
Claim 3
Dependent Claim
37 words
The invention of claim 1 wherein the paper feed cut off means also produces a signal which inhibits further printing operation of the photographic printer if the paper feed cut off means has terminated the paper feed.
Claim 4
Dependent Claim
42 words
The invention of claim 1 wherein the paper feed cut off means comprises: counter means for counting in response to clock signals; and cut off signal generator means for producing a cut off signal when the counter means reaches a predetermined count.
Claim 5
Dependent Claim
30 words
The invention of claim 3 wherein the paper feed system includes paper drive means for advancing the print paper and paper brake means for halting advance of the print paper.
Claim 6
Dependent Claim
47 words
The invention of claim 4 and further comprising: paper drive circuit means for halting the paper drive means in response to the cut off signal; and paper brake circuit means for actuating the paper brake means when the paper drive circuit means halts the paper drive means.
Claim 7
Dependent Claim
72 words
The invention of claim 5 and further comprising: paper feed length determining means for determining the predetermined feed length; and paper feed length monitoring means for monitoring print paper being advanced and producing a signal when the print paper has been advanced the predetermined feed length; and wherein the paper drive circuit means is also responsive to the signal from the paper feed length monitoring means to halt the paper drive means.
Claim 8
Dependent Claim
27 words
The invention of claim 6 wherein the paper feed length monitoring means produces, except in the case of an error condition, its signal within the predetermined period.
Claim 9
Dependent Claim
23 words
The invention of claim 3 and further comprising: exposure cycle inhibit means for inhibiting further exposure cycles upon receiving the cut off signal.
Claim 10
Dependent Claim
27 words
The invention of claim 8 and further comprising: clear circuit means for providing a clear signal to the exposure cycle inhibit means to allow further exposure cycles.
References Cited (Backward Citations)
US3045540A
Cited
US3928772A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-11-13 | 1982-05-15 | 1982-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-13 | 1986-05-15 | 1986-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-13 | 1990-05-15 | 1990-11-14 | $7700.00 | Window Closed / Lapsed |