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US3696982A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film-driving roller with device for stopping the drive mechanism if the film is overloaded
Assignee: Framo Morat GmbH and Co KG
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Filing: 1970-12-02
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Granted: 1972-10-10
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Expires: 1990-12-02
Abstract
Abstract In an optical-electronic scanning device wherein a control film is passed by film driving means and a film cassette, a means for reacting to excessive tension or pull which stops the driving means when a preselected tension is exceeded on the film.
Inventors
- 👤 Gernot Gottschall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:17
CPC Classifications
G; G03; G03B; G03B1/00; G03B1/42; G06; G06K; G06K13/00; G06K13/18; G06K13/24
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
143 words
In a film driving system having a baseplate and a plurality of means mounted for driving a film with perforations, a pressure sensitive drive means for stopping said film when a pre-selected tension is exceeded comprising at least one resilient compression means, a toothed member mounted on a drive shaft adapted to rotate against the pressure of said compression means, said compression means having one end connected to a pin on said baseplate and the other end connected to a hub on said drive shaft, switch means normally in a closed position, and a pawl pivotably mounted on said hub adapted to hold said switch means in a closed position so that when a preselected tension is exceeded on said film said compression means is decompressed and said pawl is pivoted and said switch contact is open to deactivate driving of said film.
Claim 2
Dependent Claim
143 words
In a film driving system having a baseplate and a plurality of means mounted for driving a film with perforations, a pressure sensitive drive means for stopping said film when a pre-selected tension is exceeded comprising at least one resilient compression means, a toothed member mounted on a drive shaft adapted to rotate against the pressure of said compression means, said compression means having one end connected to a pin on said baseplate and the other end connected to a hub on said drive shaft, switch means normally in a closed position, and a pawl pivotably mounted on said hub adapted to hold said switch means in a closed position so that when a preselected tension is exceeded on said film said compression means is decompressed and said pawl is pivoted and said switch contact is open to deactivate driving of said film.
Claim 3
Dependent Claim
14 words
The system according to claim 1 wherein said compression means is a compression spring.
Claim 4
Dependent Claim
60 words
The system according to claim 1 wherein said pawl is pressed against said drive shaft of said pressure sensitive drive means by a leaf spring being spaced from said pin when said compression means is decompressed, but being moved away from said drive shaft by said pin, against the force of said leaf spring, when said compression spring is compressed.
Claim 5
Dependent Claim
89 words
The system according to claim 1 wherein said drive shaft is hollow and mounted displaceably in said drive shaft by a spring, is a grooved rod actuating said switch means whereby said rod after being displaced against the force of said spring by means of said pawl engaging in the groove of said rod is capable of being locked in position and brought into a second position when the tension in the film is too high by said pawl being forced out of said groove by said compression means.
Claim 6
Dependent Claim
44 words
A system according to claim 4 including a permanent magnet attached to one end of said rod (31), said magnet holding said switch means closed in one position of said rod, and holding said switch means open in the other position of said rod.
Claim 7
Dependent Claim
14 words
The system according to claim 1 wherein said system is in a film cassette.
Claim 8
Dependent Claim
30 words
The system according to claim 1 which includes a plurality of drive shafts having toothed discs for driving sAid film, all of said drive shafts rotating at the same speed.
Claim 9
Dependent Claim
27 words
The system according to claim 1 including a pressure roller mounted on said baseplate capable of moving in a reciprocating motion so as to change the film.
References Cited (Backward Citations)
US1988980A
Cited
US3025751A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |