US3756491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for intermittently driving a film
Assignee: Canon Inc
•
Filing: 1971-08-05
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Granted: 1973-09-04
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Expires: 1991-08-05
Abstract
Abstract In a device for intermittently driving a film having means for intermittently driving the film while a driving claw is in engagement with a perforation of the film, and means for restoring the claw from a position of completion of the driving to a position of start of the film driving, and for permitting the film to be maintained at a static state while the driving claw is disengaged with the perforation, improvements comprising an auxiliary means for restricting the driving claw, positioned in a position to restrict an impulsive action of the driving claw at least when the driving claw is engaged or disengaged with the perforation of the film in order to prevent the impulsive action of the driving claw.
Inventors
- 👤 I Moriyama
- 👤 T Takigawa
- 👤 H Shibuya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:29
CPC Classifications
G; G03; G03B; G03B1/00; G03B1/18; G03B1/20; G03B1/22
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
265 words
In a device for intermittently driving film containing perforations, the combination comprising: a film-driving claw engageable with and disengageable from the perforations of the film; carrying means supporting said film-driving claw and operable to move said claw through a normal operating cycle for intermittently transporting a predetermined length of the film; means for swingingly driving said carrying means in a direction substantially perpendicular to the direction of film transport in order to engage and disengage said driving claw from the film perforations; and auxiliary means for restricting the action of said film-driving claw to prevent an irregular action during the normal operating cycle, said auxiliary means including a movable member engageable with said carrying means supporting said filmdriving claw and a stationary member arranged in engagement with said movable member for normally biasing said movable member in a direction away from the film during the normal operating cycle of said claw, said movable member is a spring member, said stationary member having a planor portion engageable with said movable member when the claw is in engagement with the perforation in the film and a projected portion contiguous to said planor portion and extending toward said movable member and said projected portion being engageable with said movable member when said claw disengages from the perforation in the film for exerting a force larger than the force upon said carrying means in a direction perpendicular to the direction of film transport for restricting the swinging movement of said carrying means to prevent an irregular action of said claw when it disengages from the perforation of the film.
Claim 2
Dependent Claim
265 words
In a device for intermittently driving film containing perforations, the combination comprising: a film-driving claw engageable with and disengageable from the perforations of the film; carrying means supporting said film-driving claw and operable to move said claw through a normal operating cycle for intermittently transporting a predetermined length of the film; means for swingingly driving said carrying means in a direction substantially perpendicular to the direction of film transport in order to engage and disengage said driving claw from the film perforations; and auxiliary means for restricting the action of said film-driving claw to prevent an irregular action during the normal operating cycle, said auxiliary means including a movable member engageable with said carrying means supporting said filmdriving claw and a stationary member arranged in engagement with said movable member for normally biasing said movable member in a direction away from the film during the normal operating cycle of said claw, said movable member is a spring member, said stationary member having a planor portion engageable with said movable member when the claw is in engagement with the perforation in the film and a projected portion contiguous to said planor portion and extending toward said movable member and said projected portion being engageable with said movable member when said claw disengages from the perforation in the film for exerting a force larger than the force upon said carrying means in a direction perpendicular to the direction of film transport for restricting the swinging movement of said carrying means to prevent an irregular action of said claw when it disengages from the perforation of the film.
Claim 3
Dependent Claim
22 words
A device according to claim 1 wherein said means for driving said carrying means include rotatable means engageable with said carrying means.
Claim 4
Dependent Claim
26 words
A device according to claim 2 wherein said rotatable means further comprise an end cam and an eccentrically arranged member mounted thereon engaging said carrying means.
Claim 5
Dependent Claim
28 words
A device according to claim 3, wherein said carrying means comprise a projection member engageable with said end cam and an opening engageable with said eccentrically arranged member.
Claim 6
Dependent Claim
23 words
A device according to claim 1, wherein said carrying means further comprise biasing means normally pressing said carrying means against said driving means.
Claim 7
Dependent Claim
86 words
A device according to claim 1, wherein said movable member of said auxilliary means is engageable with said stationary member when said film driving claw comes into a position engaging a perforation of said film, said auxilliary means being arranged to exert a force upon said carrying means in a direction perpendicular to the direction of film transport for restricting the swinging movement of said carrying means thereby to prevent irregular action of said claw when it comes into engagement with a perforation of the film.
Claim 8
Dependent Claim
227 words
In a device for intermittently driving film containing perforations, the combination comprising: a film-driving claw engageable with and disengageable from the perforations of the film; carrying means supporting said film driving claw and operable to move said claw through a normal operating cycle to intermittently transport a predetermined length of said film; means for swingingly driving said carrying means in a direction substantially perpendicular to the direction of film transport in order to engage and disengage said driving claw from said film perforations; and auxiliary means for restricting the action of said film-driving claw during said normal operating cycle, said auxiliary means including a stationary member and a movable member engageable with said stationary member at least during the portion of said claw operating cycle when said claw is disengaging from a perforation of the film, said auxiliary means being arranged to exert a force upon said carrying means in a direction perpendicular to the direction of film transport thereby restricting the swinging movement of said carrying means to prevent irregular action of said claw when it disengages from the perforation of the film biasing means normally pressing said carrying means against said driving means, said biasing means comprise a resilient member applying a variable resilient force against said carrying means, and means for determining said resilient force in accordance with the driving speed of said film.
Claim 9
Dependent Claim
227 words
In a device for intermittently driving film containing perforations, the combination comprising: a film-driving claw engageable with and disengageable from the perforations of the film; carrying means supporting said film driving claw and operable to move said claw through a normal operating cycle to intermittently transport a predetermined length of said film; means for swingingly driving said carrying means in a direction substantially perpendicular to the direction of film transport in order to engage and disengage said driving claw from said film perforations; and auxiliary means for restricting the action of said film-driving claw during said normal operating cycle, said auxiliary means including a stationary member and a movable member engageable with said stationary member at least during the portion of said claw operating cycle when said claw is disengaging from a perforation of the film, said auxiliary means being arranged to exert a force upon said carrying means in a direction perpendicular to the direction of film transport thereby restricting the swinging movement of said carrying means to prevent irregular action of said claw when it disengages from the perforation of the film biasing means normally pressing said carrying means against said driving means, said biasing means comprise a resilient member applying a variable resilient force against said carrying means, and means for determining said resilient force in accordance with the driving speed of said film.
Claim 10
Dependent Claim
18 words
A device according to claim 7 wherein said biasing means further comprise a film driving speed setting means.
References Cited (Backward Citations)
US3212840A
Cited
US3463373A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |