US4243891A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for detecting holes in webs of photographic paper or the like
Assignee: Agfa Gevaert AG
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Filing: 1978-06-26
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Granted: 1981-01-06
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Expires: 1998-06-26
Abstract
Abstract Apparatus for detection of holes in a running web of photographic paper has a U-shaped housing with two spaced-apart legs between which a portion of the web travels toward a severing device. One leg of the housing contains several photoconductive detectors, and the other leg of the housing contains the light emitting portion of a light conducting prism whose light admitting portion is adjacent to a light source mounted in the housing inwardly of the detectors. The prism disperses the incoming light so as to uniformly illuminate the web portion in the gap between the two legs of the housing. The light source, the detectors and an amplifier for signals which are transmitted by the detectors are mounted on a plate which further carries conductors connecting the detectors with the amplifier.
Inventors
- 👤 Rudolf Dobler
- 👤 Klaus Weber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:38
CPC Classifications
G; G03; G03D; G03D15/00; G03D15/04; G03D15/043; G03D15/046; B; B26; B26D; B26D5/00; B26D5/20; B26D5/30; B26D5/34; B26D7/00; B26D7/01; B26D7/015
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
131 words
Apparatus for scanning a running web for the presence of holes, particularly for monitoring a web of exposed and developed photographic paper for the presence of holes which are associated with successive prints, comprising means for advancing the web lengthwise along a predetermined path; photoconductive detector means adjacent to one side of said path; a light source remote from and located at said one side of said path; and means for optically coupling said source with said detector means, said coupling means having a light admitting portion adjacent to said source and a light emitting portion located opposite said detector means at the other side of said path so that said detector means is exposed to light when a hole is located between said light emitting portion and said detector means.
Claim 2
Dependent Claim
131 words
Apparatus for scanning a running web for the presence of holes, particularly for monitoring a web of exposed and developed photographic paper for the presence of holes which are associated with successive prints, comprising means for advancing the web lengthwise along a predetermined path; photoconductive detector means adjacent to one side of said path; a light source remote from and located at said one side of said path; and means for optically coupling said source with said detector means, said coupling means having a light admitting portion adjacent to said source and a light emitting portion located opposite said detector means at the other side of said path so that said detector means is exposed to light when a hole is located between said light emitting portion and said detector means.
Claim 3
Dependent Claim
33 words
Apparatus as defined in claim 1, wherein said coupling means includes a light conducting coupling portion interconnecting said light admitting and light emitting portions and located at said other side of said path.
Claim 4
Dependent Claim
16 words
Apparatus as defined in claim 1, wherein said detector means comprises a plurality of discrete detectors.
Claim 5
Dependent Claim
18 words
Apparatus as defined in claim 3, wherein said discrete detectors form a row extending transversely of said path.
Claim 6
Dependent Claim
13 words
Apparatus as defined in claim 3, wherein said source includes a single lamp.
Claim 7
Dependent Claim
30 words
Apparatus as defined in claim 3, wherein said light emitting portion includes means for substantially uniformly illuminating that portion of the web which is adjacent to said plurality of detectors.
Claim 8
Dependent Claim
36 words
Apparatus as defined in claim 1, wherein said coupling means comprises a light conductor including a first end portion which constitutes said light admitting portion and a second end portion which constitutes said light emitting portion.
Claim 9
Dependent Claim
25 words
Apparatus as defined in claim 7, wherein said light conductor includes means for uniformly dispersing the emitted light upon the adjacent portion of the web.
Claim 10
Dependent Claim
13 words
Apparatus as defined in claim 8, wherein said light conductor is a prism.
Claim 11
Dependent Claim
31 words
Apparatus as defined in claim 9, wherein said prism is a triangular prism having a base, said light admitting and light emitting portions of said prism being adjacent to said base.
Claim 12
Dependent Claim
16 words
Apparatus as defined in claim 10, wherein at least one apex of said prism is flattened.
Claim 13
Dependent Claim
56 words
Apparatus as defined in claim 9 for scanning a running web for the presence of holes having a predetermined width, as considered in the longitudinal direction of the web, wherein the width of said second end portion of said prism, as considered in the direction of movement of the web, at least equals said predetermined width.
Claim 14
Dependent Claim
19 words
Apparatus as defined in claim 1, further comprising a common support for said light source and said detector means.
Claim 15
Dependent Claim
30 words
Apparatus as defined in claim 13, further comprising amplifier means provided on said support and conductor means provided on said support and connecting said detector means with said amplifier means.
Claim 16
Dependent Claim
17 words
Apparatus as defined in claim 1, wherein said coupling means consists of a transparent synthetic plastic material.
Claim 17
Dependent Claim
11 words
Apparatus as defined in claim 15, wherein said material is Plexiglas.
Claim 18
Dependent Claim
67 words
Apparatus as defined in claim 1, further comprising a housing including first and second portions respectively adjacent to said one and said other side of said path, said portions defining a gap through which a portion of said path extends, said detector means being located in said first portion and said light emitting portion of said coupling means being located in said second portion of said housing.
Claim 19
Dependent Claim
45 words
Apparatus as defined in claim 17, wherein said housing is substantially U-shaped, said first and second portions constituting two substantially parallel legs of said housing and said housing further including a web for said light source and said light admitting portion of said coupling means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-06 | 1984-07-07 | 1985-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-06 | 1988-07-07 | 1989-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-06 | 1992-07-07 | 1993-01-06 | $7700.00 | Window Closed / Lapsed |