US3851839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compliance roll
Assignee: Xerox Corp
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Filing: 1973-09-21
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Granted: 1974-12-03
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Expires: 1993-09-21
Abstract
Abstract A compliance roll structure suitable for use in processing a web of film within a thermal developing cavity. The roll is adapted to accommodate for a change in the web geometry caused by one curved surface of the developing cavity being brought into contact therewith. The compliance roll delivers a constant load to the film thus placing the film under a uniform tension during development.
Inventors
- 👤 F Hynes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:01
CPC Classifications
G; G03; G03D; G03D13/00; G03D13/002
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
170 words
In apparatus for processing a web of film having a developing system including a curvilinear surface adapted to move into contact with said film whereby the film is tensioned against said curvilinear surface, the improvement comprising means to secure said film on both sides of said developing system to form a fiLm loop of predetermined length therebetween having at least one straight run thereon, means to place said curvilinear surface into contact with said film along said straight run, a compliance roll movably positioned between said curvilinear surface and one of said film securing means whereby said compliance roll contacts said film, said compliance roll being arranged to move in compliance with the change in the film loop geometry caused by the curvilinear surface moving into contact with said film, bias means operatively associated with said compliance roll for tensioning said roll under a constant load against said film throughout the range of roll movement, said bias means including a compression spring of substantially constant compression force throughout its displacement.
Claim 2
Dependent Claim
170 words
In apparatus for processing a web of film having a developing system including a curvilinear surface adapted to move into contact with said film whereby the film is tensioned against said curvilinear surface, the improvement comprising means to secure said film on both sides of said developing system to form a fiLm loop of predetermined length therebetween having at least one straight run thereon, means to place said curvilinear surface into contact with said film along said straight run, a compliance roll movably positioned between said curvilinear surface and one of said film securing means whereby said compliance roll contacts said film, said compliance roll being arranged to move in compliance with the change in the film loop geometry caused by the curvilinear surface moving into contact with said film, bias means operatively associated with said compliance roll for tensioning said roll under a constant load against said film throughout the range of roll movement, said bias means including a compression spring of substantially constant compression force throughout its displacement.
Claim 3
Dependent Claim
31 words
The apparatus of claim 1 wherein said film has an emulsion on one side thereof and said compliance roll is adapted to contact the side of said film opposite said emulsion.
Claim 4
Dependent Claim
23 words
The apparatus of claim 1 wherein said film is adapted to be indexed in a frame by frame sequence through said developing system.
Claim 5
Dependent Claim
25 words
The apparatus of claim 3 wherein said roll is adapted to move in a direction substantially normal to the path of travel of said film.
Claim 6
Dependent Claim
14 words
The apparatus of claim 1 wherein said compression spring comprises a helix spring member.
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) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |