US3574460A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-pressure gate for photographic contact printing
Assignee: APT FINANCAL CORP A CORPOF NV
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Filing: 1968-11-14
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Granted: 1971-04-13
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Expires: 1988-11-14
Abstract
Abstract A new photographic printing apparatus with which contact prints are made by exposing the original film and the printing stock material at a time when they are brought into intimate contact with one another by pneumatic pressure. The sandwich arrangement of film and printing stock is passed over a drum above which is contiguously disposed a ''''shoe'''' mechanism that is contoured to be partially concentric with the drum, a small or narrow air gap separating the drum and shoe whereat they are concentric. The air, under pressure, is applied to the film from the shoe side and escapes through the air gap, the entire arrangement providing the pressure distribution needed to achieve fine contact printing.
Inventors
- 👤 Alvin A Snaper
- 👤 Frank R Gibson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:42
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/02; G03B27/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
110 words
A high-pressure gate for photographic printing, said gate comprising: a cylindrical drum; apparatus mounted contiguously to the lateral surface of said drum and concentrically with a portion thereof, said apparatus being pivotally mounted at one end and including a device for fixing the other end in position, said device including means for adjusting the degree of contiguity between said drum and said apparatus, said apparatus including a space therein whereat photographic film passing between said drum and apparatus may be exposed to radiant energy, a transparent pressure-tight window mounted in and covering said space, and means within said apparatus and extending therethrough for propagating gas under pressure to said space.
Claim 2
Dependent Claim
110 words
A high-pressure gate for photographic printing, said gate comprising: a cylindrical drum; apparatus mounted contiguously to the lateral surface of said drum and concentrically with a portion thereof, said apparatus being pivotally mounted at one end and including a device for fixing the other end in position, said device including means for adjusting the degree of contiguity between said drum and said apparatus, said apparatus including a space therein whereat photographic film passing between said drum and apparatus may be exposed to radiant energy, a transparent pressure-tight window mounted in and covering said space, and means within said apparatus and extending therethrough for propagating gas under pressure to said space.
Claim 3
Dependent Claim
98 words
A high-pressure gate for photographic printing, said gate comprising: a cylindrical drum; apparatus mounted contiguously to the lateral surface of said drum and concentrically with a portion thereof, said apparatus including a space therein whereat photographic film passing between said drum and apparatus may be exposed to radiant energy, the wall of said apparatus surrounding said space being beveled and serrated to prevent spurious reflections of radiant energy from reaching the film, a transparent pressure-tight window mounted in and covering said space, and means within said apparatus and extending therethrough for propagating gas under pressure to said space.
Claim 4
Dependent Claim
98 words
A high-pressure gate for photographic printing, said gate comprising: a cylindrical drum; apparatus mounted contiguously to the lateral surface of said drum and concentrically with a portion thereof, said apparatus including a space therein whereat photographic film passing between said drum and apparatus may be exposed to radiant energy, the wall of said apparatus surrounding said space being beveled and serrated to prevent spurious reflections of radiant energy from reaching the film, a transparent pressure-tight window mounted in and covering said space, and means within said apparatus and extending therethrough for propagating gas under pressure to said space.
Claim 5
Dependent Claim
117 words
A high-pressure gate for photographic printing, said gate comprising: a cylindrical drum; apparatus mounted contiguously to the lateral surface of said drum and concentrically with a portion thereof, said apparatus including a space therein whereat photographic film passing between said drum and apparatus may be exposed to radiant energy, a transparent pressure-tight window mounted in and covering said space, means within said apparatus and extending therethrough for propagating gas under pressure to said space, and an electro-optical and mechanical arrangement for automatically applying and releasing gas pressure to and from, respectively, the film, said arrangement including regulating means for applying the pressure during the period the film is to be exposed and for releasing it immediately thereafter.
Claim 6
Dependent Claim
117 words
A high-pressure gate for photographic printing, said gate comprising: a cylindrical drum; apparatus mounted contiguously to the lateral surface of said drum and concentrically with a portion thereof, said apparatus including a space therein whereat photographic film passing between said drum and apparatus may be exposed to radiant energy, a transparent pressure-tight window mounted in and covering said space, means within said apparatus and extending therethrough for propagating gas under pressure to said space, and an electro-optical and mechanical arrangement for automatically applying and releasing gas pressure to and from, respectively, the film, said arrangement including regulating means for applying the pressure during the period the film is to be exposed and for releasing it immediately thereafter.
Claim 7
Dependent Claim
87 words
The gate defined in claim 3 wherein said arrangement includes a fluidic amplifier device having two outlet channels and adapted to selectively Direct a gas stream flowing therethrough to one of said two outlet channels, one outlet channel venting to the atmosphere and the other outlet channel feeding the means within said apparatus that propagates the gas to said space, and control apparatus coupled to said fluidic device to selectively direct the gas stream between said two outlet channels in accordance with the position of the film.
Claim 8
Dependent Claim
30 words
The gate defined in claim 4 wherein said fluidic device is a monostable fluidic amplifier biased to normally direct a gas stream to its outlet channel venting to the atmosphere.
Claim 9
Dependent Claim
66 words
The gate defined in claim 4 wherein said control apparatus includes pressure means for diverting the gas stream from said one to the other of said outlet channels when coupled to said fluidic device, and a valve connected between said pressure means and said fluidic device, said valve being constructed to open in response to an electrical signal and adapted to close a set time thereafter.
Claim 10
Dependent Claim
47 words
The gate defined in claim 6 wherein said control apparatus further includes a film code detector for generating an electrical signal when a frame on the film is to be exposed for printing purposes, said detector being coupled to said valve and applying said electrical signal thereto.
Claim 11
Dependent Claim
55 words
The gate defined in claim 7 wherein said gate further includes exposure means comprising a printing light source that is selectively operable, and a pressure-sensitive microswitch coupled between said light source and the other outlet channel of said fluidic amplifier device, said microswitch operating said light source when gas flows through said other outlet channel.
References Cited (Backward Citations)
CH438938A
Cited
US3468606A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |