US3812348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for electro-optically ascertaining holes in moving webs
Assignee: Individual
•
Filing: 1972-11-20
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Granted: 1974-05-21
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Expires: 1992-11-20
Abstract
Abstract A device for electro-optically ascertaining holes in moving webs of paper and the like, in which on opposite sides of the path over which the web is moved there are respectively arranged a light source and light sensitive means the inlet signals of which are conveyed to amplifiers. The light source includes a threadshaped filament extending transverse to the direction of movement of the web to be checked, and the light sensitive means are arranged in pairs with the elements of each pair respectively arranged in two common rows located one behind the other and substantially parallel to the longitudinal direction of the filament, the elements of the light sensitive means of each pair being electrically opposed to each other in such a way that light simultaneously hitting both elements of one and the same pair of light sensitive means will not initiate a signal.
Inventors
- 👤 R Hiemke
- 👤 P Lippke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:36
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/89; G01N21/8901; G01N21/892; G01N21/894
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
191 words
A device for electro-optically ascertaining holes in a moving web, especially web of paper, which includes: a source of illumination comprising a thread-shaped light source, light sensitive means adapted to initiate a signal, said light sensitive means being arranged in pairs one behind the other so that the two light sensitive means of all of said pairs are respectively arranged in two common seperate rows substantially parallel to each other and to the longitudinal extension of said thread-shaped light source, said light sensitive means also having outlets for releasing signals, said source of illumination and said light sensitive means being arranged one above the other in spaced relationship to each other, and conveying means for conveying a web between and in spaced relationship to said source of illumination and said light sensitive means, said threadshaped light source having Its direction of length arranged transverse to the conveying direction of said conveying means, and the light sensitive means of each of said pairs of light sensitive means electrically opposing each other so that light simultaneously hitting both light sensitive means of one and more of said pairs will not initiate a signal.
Claim 2
Independent Claim
191 words
A device for electro-optically ascertaining holes in a moving web, especially web of paper, which includes: a source of illumination comprising a thread-shaped light source, light sensitive means adapted to initiate a signal, said light sensitive means being arranged in pairs one behind the other so that the two light sensitive means of all of said pairs are respectively arranged in two common seperate rows substantially parallel to each other and to the longitudinal extension of said thread-shaped light source, said light sensitive means also having outlets for releasing signals, said source of illumination and said light sensitive means being arranged one above the other in spaced relationship to each other, and conveying means for conveying a web between and in spaced relationship to said source of illumination and said light sensitive means, said threadshaped light source having Its direction of length arranged transverse to the conveying direction of said conveying means, and the light sensitive means of each of said pairs of light sensitive means electrically opposing each other so that light simultaneously hitting both light sensitive means of one and more of said pairs will not initiate a signal.
Claim 3
Dependent Claim
27 words
A device according to claim 1, in which the light source comprises at least one tubular incandescent lamp with a thin filament in a clear glass bulb.
Claim 4
Dependent Claim
48 words
A device according to claim 1, which includes a voltage divider, and differential amplifier means having inlets respectively electrically connected to the outlets of the pairs of said light sensitive means through said voltage divider for compensating for the influence of undesired light hitting said light sensitive means.
Claim 5
Dependent Claim
28 words
A device according to claim 1, in which said light sensitive means are protected against the influence of undesired surrounding light from surrounding foreign light sources by shields.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |