US3746865A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Threadline defect detector
Assignee: Celanese Corp
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Filing: 1971-07-06
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Granted: 1973-07-17
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Expires: 1991-07-06
Abstract
Abstract A detector for indicating the presence of partially broken, frizzed or knotted sections of threadlines, such as may occur during fiber forming operations, includes a housing, a lamp for directing light onto a rapidly moving threadline, a photoelectric cell for receiving such light and generating an electrical signal in response to it, guide means for snubbing the moving threadline and maintaining it in substantially constant positional relationship with the light, and an electronic signal amplification circuit in the housing, utilizing controlled capacitive buildup and decay of electronic signals responsive to those from the photoelectric cell, with the controlled buildup and decay being such that breaking of thread filaments, frizzing or knotting occuring over a length of from 2 to 50 times the width of the threadline actuates a counter, marker, cutter, visual or audio signal or other indicator or responsive device when the broken filaments are of a thickness from 1 to 30 percent of the threadline. Other aspects of the invention include the mechanical structure of the detector, electronic circuitry and use of the device.
Inventors
- 👤 J Burch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:20
CPC Classifications
B; B65; B65H; B65H63/00; B65H63/06; B65H63/062; B65H63/065; B65H2701/00; B65H2701/30; B65H2701/31
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
267 words
A detector for indicating the presence of defects in a moving threadline which comprises a housing, an incandescent lamp or light emitting diode having a diameter less than 1 centimeter for providing radiation, a planar photoelectric cell having an area less than 1 square centimeter for receiving radiation, said lamp and said photoelectric cell being secured within hollow ceramic cylinders with a passageway between them defined by the ends of said cylinders said passageway allowing for the passage of a moving threadline so that the threadline partially interrupts the radiation from the emitter to the receiver, ceramic rod guide means of diameters less than that of said cylinders for maintaining said moving threadline in substantially constant positional relationship with the path of emitted radiation, said cylinders being secured between said rods and said rods being secured to the exterior of said housing, an electronic signal amplification circuit enclosed by said housing the input voltage to which is less than 25 volts, said circuit including capacitive means for producing an amplified signal which is changed in response to partially broken and frizzed or knotted sections of threadlines in which the break of one or more thread filaments and resulting frizzing or knotting occur over a length which is from about two to fifty times the width of the threadline and in which the broken filaments are of a thickness of from 1 to 30 percent that of the threadline, and a receptacle on said housing to which an operating signal from said electronic signal amplification circuit is communicated and from which it is transmittible to a counting device.
Claim 2
Dependent Claim
267 words
A detector for indicating the presence of defects in a moving threadline which comprises a housing, an incandescent lamp or light emitting diode having a diameter less than 1 centimeter for providing radiation, a planar photoelectric cell having an area less than 1 square centimeter for receiving radiation, said lamp and said photoelectric cell being secured within hollow ceramic cylinders with a passageway between them defined by the ends of said cylinders said passageway allowing for the passage of a moving threadline so that the threadline partially interrupts the radiation from the emitter to the receiver, ceramic rod guide means of diameters less than that of said cylinders for maintaining said moving threadline in substantially constant positional relationship with the path of emitted radiation, said cylinders being secured between said rods and said rods being secured to the exterior of said housing, an electronic signal amplification circuit enclosed by said housing the input voltage to which is less than 25 volts, said circuit including capacitive means for producing an amplified signal which is changed in response to partially broken and frizzed or knotted sections of threadlines in which the break of one or more thread filaments and resulting frizzing or knotting occur over a length which is from about two to fifty times the width of the threadline and in which the broken filaments are of a thickness of from 1 to 30 percent that of the threadline, and a receptacle on said housing to which an operating signal from said electronic signal amplification circuit is communicated and from which it is transmittible to a counting device.
Claim 3
Dependent Claim
91 words
The apparatus of claim 1 wherein said rods are solid rods which are cemented to said cylinders, the opposite ends of said cylinders being closed and said lamp and photoelectric cell are held in place by opaque silicone rubber ceMent, which is removable when it is desired to change said lamp or said photoelectric cell element, said electronic circuit is substantially of the printed circuit type and means are provided, on said housing, for adjustably affixing said detector in place with respect to a moving threadline to be inspected or monitored.
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) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |