Patent US3881820A successfully refreshed from Google Patents.
US3881820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for automatic reel-film enlarger printer
Assignee: INFORMATION INTERNATIONAL Inc
•
Filing: 1974-06-17
•
Granted: 1975-05-06
•
Expires: 1994-06-17
Abstract
Abstract A control system for automatically printing a sequence of frames stored on a reel of film operates on marks positioned opposite the frames on the film, one mark per frame. Each mark sensed will normally stop the film drive and print the frame. Once exposure for printing has occurred, the film drive is restarted to automatically print the next frame, until the number of frame marks counted is equal to the number of frames selected. To print alternate frames of the sequence only, a gate is enabled to cause a flip-flop to alternate states with each mark sensed and thereby to inhibit every other mark sensed from stopping the film drive and printing a frame.
Inventors
- 👤 Max K Muir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:04
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/52; G03B27/62; G03B27/6271; G03B27/6285
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
162 words
In a control system for automatically printing a sequence of frames stored on a reel of film in response to marks sensed on the film, said sensed marks producing mark pulses, one for each frame, said mark pulses stopping a film drive mechanism and actuating a mechanism for printing a frame, said printing mechanism emitting a go signal to automatically restart said film drive mechanism to advance film to the next frame, means for causing only alternate frames to be printed comprising a gate means for transmitting said mark pulses to said film drive mechanism and printing mechanism, a bistable means for enabling said gate means while in a first of two stable states, means for transmitting said go signal to said bistable means to set it in a second state, thereby causing said gate means to block the next mark pulse, and means for transmitting said mark pulses to said bistable means for resetting said bistable means to said first state.
Claim 2
Dependent Claim
162 words
In a control system for automatically printing a sequence of frames stored on a reel of film in response to marks sensed on the film, said sensed marks producing mark pulses, one for each frame, said mark pulses stopping a film drive mechanism and actuating a mechanism for printing a frame, said printing mechanism emitting a go signal to automatically restart said film drive mechanism to advance film to the next frame, means for causing only alternate frames to be printed comprising a gate means for transmitting said mark pulses to said film drive mechanism and printing mechanism, a bistable means for enabling said gate means while in a first of two stable states, means for transmitting said go signal to said bistable means to set it in a second state, thereby causing said gate means to block the next mark pulse, and means for transmitting said mark pulses to said bistable means for resetting said bistable means to said first state.
Claim 3
Dependent Claim
53 words
Apparatus as defined by claim 1 wherein said means for transmitting said go signal to said bistable means to set it in a second state comprises a coupling means and means for selectively enabling said coupling means for printing alternate frames and disabling said coupling means for printing every frame of said sequence.
Claim 4
Dependent Claim
66 words
Apparatus as defined by claim 2 including a counter connected to receive and count every mark pulse and means for comparing the count of said counter with an end count corresponding to the last frame of said sequence, and means responsive to said comparator for inhibiting a go signal from restarting said film drive when said counter has reached a count equal to said end count.
References Cited (Backward Citations)
US3558226A
Cited
US3600089A
Cited
US3634006A
Cited
US3672769A
Cited
US3685902A
Cited
US3768905A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |