US3582661A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoelectric yarn measurer having reference channel
Assignee: US Philips Corp
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Filing: 1968-09-23
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Granted: 1971-06-01
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Expires: 1988-09-23
Abstract
Abstract A yarn cleaner for measuring the absolute yarn diameter includes a light source optically coupled to first and second photocells arranged in a measuring channel through which the yarn passes and a reference channel without yarn, respectively. The respective yarn and reference signals from the first and second photocells are summed together to derive a signal proportional to the absolute yarn diameter. The latter signal is applied to one input of an amplitude discriminator and a threshold voltage is applied to a second input thereof. A control loop is formed is formed by a comparison circuit and a source of variable voltage in cascade between the second photocell and the light source. An external source of adjustable reference voltage is applied to one input of the comparison circuit whereby the control loop operates to match the second photocell reference signal to the external reference voltage.
Inventors
- 👤 Hermanus Stephanus Josep Pijls
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:41
CPC Classifications
B; B65; B65H; B65H63/00; B65H63/06; B65H63/062; B65H63/065; G; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/89; G01N21/8914; G01N21/8915; B65H2701/00; B65H2701/30; B65H2701/31
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
165 words
A yarn cleaner for measuring the absolute diameter or the absolute mass of a yarn, comprising a variable energy supply source, a measuring channel coupled to the supply source through which the yarn can be passed and comprising means for converting the diameter or the mass per unit of length of the yarn into an electric yarn signal, and comprising furthermore an amplitude discriminator, a reference channel without yarn coupled to the same variable source as the measuring channel and including means for producing an electric reference signal, an external source of absolute reference signal, a control-loop including said variable source and said reference channel for equalizing the reference signal to the external absolute reference signal, a summation device having inputs for receiving the yarn signal and the reference signal and an output at which a signal proportional to the absolute diameter or the absolute mass per unit of length of the yarn appears, and means for applying the latter signal to the amplitude discriminator.
Claim 2
Dependent Claim
165 words
A yarn cleaner for measuring the absolute diameter or the absolute mass of a yarn, comprising a variable energy supply source, a measuring channel coupled to the supply source through which the yarn can be passed and comprising means for converting the diameter or the mass per unit of length of the yarn into an electric yarn signal, and comprising furthermore an amplitude discriminator, a reference channel without yarn coupled to the same variable source as the measuring channel and including means for producing an electric reference signal, an external source of absolute reference signal, a control-loop including said variable source and said reference channel for equalizing the reference signal to the external absolute reference signal, a summation device having inputs for receiving the yarn signal and the reference signal and an output at which a signal proportional to the absolute diameter or the absolute mass per unit of length of the yarn appears, and means for applying the latter signal to the amplitude discriminator.
Claim 3
Dependent Claim
32 words
A yarn cleaner as claimed in claim 1 further comprising means for adjusting the amplitude of the external absolute reference signal in accordance with the size of the yarns to be tested.
Claim 4
Dependent Claim
120 words
A yarn cleaner as claimed in claim 1 wherein the variable energy supply source includes a source of voltage coupled to a point light source and a lens which converts the light from the light source into a parallel light beam, a light dividing member arranged to split up the parallel light beam into two portions, one portion being operative in a yarn gap of the measuring channel and the other in a part of the reference channel, a first photoelectric cell for developing said yarn signal and a second photoelectric cell for developing said reference signal, and one or more lenses arranged to focus said two portions of the light beam onto said first and second photoelectric cells, respectively.
Claim 5
Dependent Claim
17 words
A yarn cleaner as claimed in claim 3 further comprising a mask arranged behind the yarn gap.
Claim 6
Dependent Claim
19 words
A yarn cleaner as claimed in claim 3 wherein the point light source comprises a light emitting semiconductor element.
Claim 7
Dependent Claim
17 words
A yarn cleaner as claimed in claim 1 wherein the controllable supply source delivers a pulsatory voltage.
Claim 8
Dependent Claim
47 words
A yarn cleaner as claimed in claim 2 further comprising a source of adjustable threshold voltage coupled to a second input of said amplitude discriminator, said amplitude discriminator producing a control signal at its output whenever said proportional signal exceeds the adjusted value of the threshold voltage.
Claim 9
Dependent Claim
41 words
A yarn cleaner as claimed in claim 7 wherein said control loop includes signal comparison means having first and second inputs for receiving said reference signal and said absoluTe reference signal, respectively, and an output coupled to said variable energy source.
Claim 10
Dependent Claim
49 words
A yarn cleaner as claimed in claim 1 wherein said variable energy source comprises, a light source, first and second photoelectric cells arranged in said measuring channel and said reference channel, respectively, and optically coupled to said light source, and a pulse voltage source coupled to said light source.
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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |