US3610751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for controlling automatically the suction zones of vacuum back in photomechanical camera
Assignee: Dainippon Screen Manufacturing Co Ltd
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Filing: 1968-11-20
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Granted: 1971-10-05
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Expires: 1988-11-20
Abstract
Abstract Device for controlling automatically the suction zones of vacuum back in photomechanical camera, wherein the position of the vacuum back determines the size of the vacuum zone activated for holding the film and secondly a large vacuum zone is activated for holding the screen.
Inventors
- 👤 Yoshio Miyauchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:06
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/52; G03B27/58; G03B27/60
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
268 words
A device for controlling automatically the suction zones of vacuum back in a photomechanical camera, comprising: a vacuum film holder in the rear case of the camera; means for moving said vacuum film holder in said camera in a direction perpendicular to the optical axis of said camera; said vacuum film holder including an edge airpassage located along one end of said holder perpendicular to the direction of movement of said holder, and a plurality of substantially Ushaped airpassages on its front surface, thereby forming a plurality of rectangular vacuum contact zones, a cylinder communicating with a vacuum means, said cylinder having an opening at a first end thereof to receive a piston and having a plurality of openings along said cylinder, connecting said cylinder with various said airpassages, the number of said openings being equal to the number of said zones and the effective distance between the openings being related to the distances between zones; a piston inserted into said cylinder, the axis of said cylinder being in the same direction with that of the movement of the vacuum film holder, said cylinder mounted with respect to said piston to enable movement of said vacuum film holder to relatively move said cylinder and piston to change the number of said airpassages communicating with said vacuum means; and control means for changing the size of the actuated vacuum zones by one size by causing a fixed relative motion between said piston and said cylinder, and for simultaneously actuating air suction through said edge airpassage, thereby enabling a contact screen to be held over said film by a vacuum.
Claim 2
Independent Claim
268 words
A device for controlling automatically the suction zones of vacuum back in a photomechanical camera, comprising: a vacuum film holder in the rear case of the camera; means for moving said vacuum film holder in said camera in a direction perpendicular to the optical axis of said camera; said vacuum film holder including an edge airpassage located along one end of said holder perpendicular to the direction of movement of said holder, and a plurality of substantially Ushaped airpassages on its front surface, thereby forming a plurality of rectangular vacuum contact zones, a cylinder communicating with a vacuum means, said cylinder having an opening at a first end thereof to receive a piston and having a plurality of openings along said cylinder, connecting said cylinder with various said airpassages, the number of said openings being equal to the number of said zones and the effective distance between the openings being related to the distances between zones; a piston inserted into said cylinder, the axis of said cylinder being in the same direction with that of the movement of the vacuum film holder, said cylinder mounted with respect to said piston to enable movement of said vacuum film holder to relatively move said cylinder and piston to change the number of said airpassages communicating with said vacuum means; and control means for changing the size of the actuated vacuum zones by one size by causing a fixed relative motion between said piston and said cylinder, and for simultaneously actuating air suction through said edge airpassage, thereby enabling a contact screen to be held over said film by a vacuum.
Claim 3
Dependent Claim
35 words
The structure of claim 1 wherein said control means includes a valve means coupling at least one opening in said cylinder to said vacuum film holder after the film has been contacted to said holder.
Claim 4
Dependent Claim
79 words
The structure of claim 1 wherein: said cylinder has a valve means attached to at least one opening on the second end thereof and connected to said edge airpassage, and said control means is a means for moving said cylinder a fixed distance with respect to said piston so as to change the number of airpassages communicating with said vacuum means by one and simultaneously actuating said valve to place said edge airpassage in communication with said vacuum means.
Claim 5
Dependent Claim
73 words
The structure of claim 3 wherein: said piston is connected to the frame of said camera; said cylinder is connected to said vacuum film holder through a motor-lead screw means; said valve means is a linearly actuated valve; and said control means is comprised of said motor-lead screw means and a mechanical stop which actuates said valve means when said cylinder approaches one end of its travel relative to said vacuum film holder.
Claim 6
Dependent Claim
20 words
The structure of claim 4 wherein said means for moving said vacuum film holder is a second motor-lead screw means.
References Cited (Backward Citations)
US2376416A
Cited
US2895706A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-04 | 1975-04-05 | 1975-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-04 | 1979-04-05 | 1979-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-04 | 1983-04-05 | 1983-10-05 | $7700.00 | Window Closed / Lapsed |