US3765582A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synchronized generator for a photographic film printer
Assignee: Bell and Howell Co
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Filing: 1971-09-13
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Granted: 1973-10-16
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Expires: 1991-09-13
Abstract
Abstract A motor drives a pulse generating detent disc through a power transmission train. The detent disc is coupled to a film drive sprocket and the sprocket draws the film across the exposure aperture of the printer. The detent disc defines a plurality of apertures which permit light to pass through onto a photocell so that as the disc and the sprocket are rotated pulses are generated by the photocell related to the amount of film passing through the printer. When the printer aperture gate is opened a pawl is forced against the detent disc causing it to lock in one of a plurality of preselected detent positions until the drive motor is energized.
Inventors
- 👤 A Balint
- 👤 W Engel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:16
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/02; G03B27/04; G03B27/08; G03B1/00; G03B1/60; G03B21/00; G03B21/14; G03B21/32; G03B21/43
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
135 words
An apparatus for generating a signal related to the quantity of film passing through a film printer having an exposure aperture comprising: power drive means, film drive means coupled to said power drive means and engaging the film for driving the film through the printer and across the exposure aperture, signal generating means coupled to said film drive means providing a signal related to the length of film transported through said printer across the exposure aperture and means for synchronizing the start of said signal generating means to the occurrence of a relative alignment of a predetermined point on said film with respect to the exposure aperture of the printer, said synchronizing means including a member rotatably driven with said film drive means and means for locking said rotatably driven member in a preselected position.
Claim 2
Independent Claim
135 words
An apparatus for generating a signal related to the quantity of film passing through a film printer having an exposure aperture comprising: power drive means, film drive means coupled to said power drive means and engaging the film for driving the film through the printer and across the exposure aperture, signal generating means coupled to said film drive means providing a signal related to the length of film transported through said printer across the exposure aperture and means for synchronizing the start of said signal generating means to the occurrence of a relative alignment of a predetermined point on said film with respect to the exposure aperture of the printer, said synchronizing means including a member rotatably driven with said film drive means and means for locking said rotatably driven member in a preselected position.
Claim 3
Dependent Claim
46 words
An apparatus as set forth in claim 1 which further includes manual drive means coupled to said film drive means and said rotatably driven member to permit manual positioning of said member and said film drive means with respect to the exposure aperture of the printer.
Claim 4
Dependent Claim
58 words
An apparatus as set forth in claim 1 wherein said rotatably driven member comprises a disc, the circumference of said disc defining at least one detent and a pawl selectively positionable for mating contact with the circumference of said disc for engagement with said detent so as to restrain the movement of said disc in said preselected position.
Claim 5
Dependent Claim
29 words
An apparatus as set forth in claim 3 wherein said disc carries said signal generating means and wherein the circumference of said disc defines a plurality of spaced detents.
Claim 6
Dependent Claim
47 words
An apparatus as set forth in claim 4 wherein said detents defined by said disc are equally spaced about the circumference of said disc by an arcuate Distance related to the format of the film and wherein said disc defines a plurality of spaced light transmitting apertures.
Claim 7
Dependent Claim
92 words
The apparatus of claim 5 wherein each of said light transmitting apertures defined by said disc are radially aligned with one of said detents defined by said disc and are positioned in a circular path concentric with said disc and photocell means aligned with the circular path of said light apertures defined by said disc so that rotation of said disc intermittently interrupts the passage of light to said photocell to produce a pulse rate related to the rotation of said disc and to the movement of the film through the printer.
Claim 8
Dependent Claim
34 words
The apparatus of claim 3 which further includes electrically operable means coupled to said pawl, said electrically operable means serving to move said pawl selectively into mating engagement with the circumference of said disc.
Claim 9
Dependent Claim
72 words
The apparatus of claim 7 which further includes a gate closing member selectively positionable from a first position assuring engagement of said film with said film drive means and against said printer aperture to second position which facilitates threading of said film in the printer and switch means controlling said electrically operable means so as to engage said pawl with said disc when said gate closing member is in said second position.
Claim 10
Dependent Claim
39 words
The apparatus of claim 8 which further includes manual drive means coupled to said film drive means and said disc to permit manually positioning of said film drive means and said disc with respect to the printer exposure aperture.
Claim 11
Dependent Claim
31 words
The apparatus of claim 8 which further includes a control means for maintaining said electrically operable means in an energized condition while said power drive means is in a de-energized condition.
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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |