US4188112A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Out-of-frame detector for motion picture film duplicating equipment
Assignee: Individual
•
Filing: 1978-06-21
•
Granted: 1980-02-12
•
Expires: 1998-06-21
Abstract
Abstract A system is provided for a step optical printer to detect an out-of-frame condition in the printer projector and/or camera sections. The out-of-frame detector comprises a free wheeling encoder driven by film entering a gate of the printer and a second encoder driven by the printer drive mechanism. A comparator is connected to the outputs of the encoders to detect a lack of correspondence between the length of film entering the gate and the length of film being driven. Such lack of correspondence being indicative of an out-of-frame condition.
Inventors
- 👤 Michael D. Hamilton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:34
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/46; G03B27/475
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
156 words
In a printer of the type comprising: a takeup reel, a supply reel, means for transporting film along a path between said supply reel and said takeup reel, means for continuously driving said transport means, and a gate wherein film is positioned for exposure during cycles of said gate the improvement comprising: first encoder means driven by said film positioned along the path of said film between the supply reel and gate, said first encoder being adapted to generate signals indicative of the length of film driving the encoder between cycles of said gate; second encoder means driven by said transport means, said second encoder being adapted to generate signals indicative of the length of film driven by said transport between cycles of said gate; and comparator means connected to said first and second encoder means and adapted to generate a signal in the event said first encoder signal and second encoder signal do not match.
Claim 2
Dependent Claim
156 words
In a printer of the type comprising: a takeup reel, a supply reel, means for transporting film along a path between said supply reel and said takeup reel, means for continuously driving said transport means, and a gate wherein film is positioned for exposure during cycles of said gate the improvement comprising: first encoder means driven by said film positioned along the path of said film between the supply reel and gate, said first encoder being adapted to generate signals indicative of the length of film driving the encoder between cycles of said gate; second encoder means driven by said transport means, said second encoder being adapted to generate signals indicative of the length of film driven by said transport between cycles of said gate; and comparator means connected to said first and second encoder means and adapted to generate a signal in the event said first encoder signal and second encoder signal do not match.
Claim 3
Dependent Claim
17 words
The invention in accordance with claim 1 wherein said printer is an optical printer having a shuttle-gate.
Claim 4
Dependent Claim
16 words
The invention in accordance with claim 1 wherein said first encoder includes a free wheeling sprocket.
Claim 5
Dependent Claim
19 words
The invention in accordance with claim 1 further comprising a feedback loop between said comparator and said drive means.
Claim 6
Dependent Claim
56 words
The invention in accordance with claim 1 further comprising a supply sprocket in said film path between said supply reel and said gate, a loop in said film path between said supply sprocket and said gate, and feeler switches positioned adjacent said loop to detect if said film slackens or tightens said loop beyond preset limits.
Claim 7
Dependent Claim
55 words
The invention in accordance with claim 1 further comprising a takeup sprocket in said film path between said supply reel and said gate, a loop in said film path between said takeup sprocket and gate, and feeler switches positioned adjacent said loop to detect if said film slackens or tightens said loop beyond preset limits.
Claim 8
Dependent Claim
41 words
The invention in accordance with claim 1 further comprising a supply sprocket in said film path between said supply reel and said gate and film tension sensing means positioned in said film path between said supply reel and said supply sprocket.
Claim 9
Dependent Claim
41 words
The invention in accordance with claim 1 further comprising a takeup sprocket in said film path between said takeup reel and said gate and film tension sensing means positioned in said film path between said takeup reel and said takeup sprocket.
Claim 10
Dependent Claim
22 words
The invention in accordance with claim 1 wherein said projector includes said takeup reel, supply reel, transport means, gate and first encoder.
Claim 11
Dependent Claim
22 words
The invention in accordance with claim 1 wherein said camera includes said takeup reel, supply reel, transport means, gate and first encoder.
Claim 12
Dependent Claim
26 words
The invention in accordance with claim 1 wherein each of said projector and camera include a takeup reel, supply reel, transport means, gate and first encoder.
References Cited (Backward Citations)
US1933787A
Cited
US1969465A
Cited
DE943334C
Cited
US3040619A
Cited
US3414353A
Cited
US3768905A
Cited
US3902802A
Cited
US3881820A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-02-11 | 1983-08-13 | 1984-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-11 | 1987-08-13 | 1988-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-11 | 1991-08-13 | 1992-02-12 | $7700.00 | Window Closed / Lapsed |