Patent US4276910A successfully refreshed from Google Patents.
US4276910A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoelectrical bobbin feeler
Assignee: Loepfe AG Gebrueder
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Filing: 1980-02-22
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Granted: 1981-07-07
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Expires: 2000-02-22
Abstract
Abstract A photoelectrical bobbin feeler, in particular weft bobbin feeler, comprises one light source and two light sensors, or vice versa, two light sources and one light sensor. At least one polaroid filter is arranged in front of the one light source, or one light sensor, respectively, for polarizing the light which is specularly as well as diffusely reflected from the bobbin, and provides for a safer detection of the "bobbin empty" condition.
Inventors
- 👤 Werner Eichenberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:45
CPC Classifications
D; D03; D03D; D03D45/00; D03D45/02; D03D45/04; D03D45/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
116 words
A photoelectrical bobbin feeler for monitoring the winding condition of a textile bobbin, comprising a light source, first and second light sensors for receiving light emitted by the light source and reflected specularly and diffusely, respectively, from the bobbin, wherein the light source and light sensors have optical axes defining a scanning plane, the optical axes of the light source and first light sensor form an obtuse angle α, the optical axes of the light source and the second light sensor form an angle β of at least 30°, and a polaroid screen is arranged in front of the light source such as to pass light components oscillating in a plane perpendicular to the scanning plane.
Claim 2
Dependent Claim
116 words
A photoelectrical bobbin feeler for monitoring the winding condition of a textile bobbin, comprising a light source, first and second light sensors for receiving light emitted by the light source and reflected specularly and diffusely, respectively, from the bobbin, wherein the light source and light sensors have optical axes defining a scanning plane, the optical axes of the light source and first light sensor form an obtuse angle α, the optical axes of the light source and the second light sensor form an angle β of at least 30°, and a polaroid screen is arranged in front of the light source such as to pass light components oscillating in a plane perpendicular to the scanning plane.
Claim 3
Dependent Claim
24 words
The bobbin feeler as claimed in claim 1, wherein the angle β is an acute angle not greater than half the obtuse angle α.
Claim 4
Dependent Claim
99 words
A photoelectrical bobbin feeler for monitoring the winding condition of a textile bobbin, comprising first and second alternately pulsed light sources, a light sensor for receiving light emitted by said light sources and reflected specularly and diffusely, respectively, from the bobbin, wherein said light sources and light sensor have optical axes defining a scanning plane, the optical axes of the first light source and the light sensor form an obtuse angle α, and a polaroid screen is provided in front of the light sensor such as to pass light components oscillating in a plane perpendicular to the scanning plane.
Claim 5
Dependent Claim
99 words
A photoelectrical bobbin feeler for monitoring the winding condition of a textile bobbin, comprising first and second alternately pulsed light sources, a light sensor for receiving light emitted by said light sources and reflected specularly and diffusely, respectively, from the bobbin, wherein said light sources and light sensor have optical axes defining a scanning plane, the optical axes of the first light source and the light sensor form an obtuse angle α, and a polaroid screen is provided in front of the light sensor such as to pass light components oscillating in a plane perpendicular to the scanning plane.
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) | 1984-07-06 | 1985-01-05 | 1985-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-06 | 1989-01-05 | 1989-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-06 | 1993-01-05 | 1993-07-07 | $7700.00 | Window Closed / Lapsed |