Patent US3787690A successfully refreshed from Google Patents.
US3787690A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tension transducer
Assignee: Bell and Howell Co
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Filing: 1971-12-17
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Granted: 1974-01-22
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Expires: 1991-12-17
Abstract
Abstract A strip tension transducer includes a pair of strip guide rollers around which strip material, in which tension is to be measured, is passed so that the strip path is through the axis of rotation of a guide roller carrier which has its axis parallel to and midway between the axes of the guide rollers. Resilient bias means are coupled to the carrier for biasing it to rotate toward a limit of its rotation against strip tension forces applied to the guide rollers. The bias means are disposed coaxially of the carrier and are adjustable for varying the bias force applied to the carrier. An electro-optical signal generator is coupled to the carrier for generating a signal indicative of the angular position of the carrier.
Inventors
- 👤 J Neff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:48
CPC Classifications
G; G01; G01L; G01L5/00; G01L5/04; G01L5/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
309 words
In a strip tension transducer which includes sensing means engageable with a moving strip for the application of a force thereto by tension in the strip, the sensing means being mounted for movement toward and away from a limit of motion thereof in response to decreases and increases in strip tension force applied to sensing means and being biased toward said limit against strip tension force applied thereto, and electrical signal generating means coupled to the sensing means for generating a signal indicative of the position of the sensing means relative to said limit, the improvement in the electrical signal generating means comprising a pair of photocells, means for illuminating the photocells, and a light modulating member coupled to the sensing means for movement in response to movement of the sensing means and disposed between the illuminating means and the photocells, light modulating member defining an opaque portion, a transparent portion, and a light transmissive portion in which the light transmissivity varies proceeding along the extent thereof, the modulating member being coupled to the sensing means so that when the seNsing means is disposed away from its limit of motion the transmissive portion of the modulating member is interposed between the light source and one photocell and the transparent portion of the modulating member is interposed between the illuminating means and the other photocell, the modulating member further being coupled to the sensing means so that when the sensing means is at its limit of motion the opaque portion of the modulating member is interposed between the illuminating means and the other photocell, whereby the output of the other photocell is usable to control the operation of strip drive means in an on-off manner and whereby the output of the one photocell is usable to regulate the operation of the strip drive means to vary tension in the strip.
Claim 2
Dependent Claim
309 words
In a strip tension transducer which includes sensing means engageable with a moving strip for the application of a force thereto by tension in the strip, the sensing means being mounted for movement toward and away from a limit of motion thereof in response to decreases and increases in strip tension force applied to sensing means and being biased toward said limit against strip tension force applied thereto, and electrical signal generating means coupled to the sensing means for generating a signal indicative of the position of the sensing means relative to said limit, the improvement in the electrical signal generating means comprising a pair of photocells, means for illuminating the photocells, and a light modulating member coupled to the sensing means for movement in response to movement of the sensing means and disposed between the illuminating means and the photocells, light modulating member defining an opaque portion, a transparent portion, and a light transmissive portion in which the light transmissivity varies proceeding along the extent thereof, the modulating member being coupled to the sensing means so that when the seNsing means is disposed away from its limit of motion the transmissive portion of the modulating member is interposed between the light source and one photocell and the transparent portion of the modulating member is interposed between the illuminating means and the other photocell, the modulating member further being coupled to the sensing means so that when the sensing means is at its limit of motion the opaque portion of the modulating member is interposed between the illuminating means and the other photocell, whereby the output of the other photocell is usable to control the operation of strip drive means in an on-off manner and whereby the output of the one photocell is usable to regulate the operation of the strip drive means to vary tension in the strip.
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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |