US3833816A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for detecting the condition of an opaque band-shaped material travelling on a delivery system
Assignee: JFE Engineering Corp
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Filing: 1973-04-05
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Granted: 1974-09-03
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Expires: 1993-04-05
Abstract
Abstract An apparatus for detecting the parallelism between the lengthwise edge of an opaque band-shaped material travelling on a delivery system relative to the longitudinal axis of the delivery system wherein a first and a second detector are spatially arranged along the lengthwise edge, in the direction of travel of the lengthwise edge on the delivery system, so as to detect the position of the lengthwise edge, each detector including of a light projector and a light receiver facing said projector across the lengthwise edge of the travelling material. Each light receiver preferably includes an aggregate of numerous fine optical fibers and numerous photoelectric conversion elements connected to the individual fibers. Outputs from the first and second detectors are conducted from the numerous photoelectric conversion elements supplied with light from the light projectors to two input terminals of a differential amplifier which in turn generates outputs for detecting the parallelism of the edge of the band-shaped material travelling on the delivery system.
Inventors
- 👤 T Shimoma
- 👤 T Emura
- 👤 S Kawabata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:59
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/26; G01D5/32; G01D5/34; G01D5/342; B; B21; B21C; B21C51/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
258 words
An apparatus for detecting the parallelism between the lengthwise edge of an opaque band-shaped material travelling on a delivery system and the longitudinal axis of said delivery system which is set at a right angle to the cutting blade of a shearing machine to which the band-shaped material is to be delivered, comprising: a first and a second detector spaced from each other and arranged along said lengthwise edge in the direction of travel of said lengthwise edge on the delivery system so as tO detect the position of said lengthwise edge, each detector comprising: a light projector; a light receiver including a plurality of photoelectric conversion elements which are so disposed as to face said light projector across said lengthwise edge of the band-shaped travelling material, and a plurality of fine optical fiber elements supplied with light from the projector, said plurality of photoelectric conversion elements being optically connected to said optical fiber elements; and a plurality of switching circuits connected to said photoelectric conversion elements; and means coupled to the outputs of the switching circuits of the first and second detectors for generating a signal indicating the parallelism of the band-shaped material travelling on the delivery system upon receipt of outputs from the first and second detectors, said generating means comprising: a comparison circuit supplied with said outputs from the first and second detectors; an average circuit supplied with outputs from said comparison circuit during a prescribed length of time; and a display unit and an alarm unit both supplied with outputs from said average circuit.
Claim 2
Independent Claim
258 words
An apparatus for detecting the parallelism between the lengthwise edge of an opaque band-shaped material travelling on a delivery system and the longitudinal axis of said delivery system which is set at a right angle to the cutting blade of a shearing machine to which the band-shaped material is to be delivered, comprising: a first and a second detector spaced from each other and arranged along said lengthwise edge in the direction of travel of said lengthwise edge on the delivery system so as tO detect the position of said lengthwise edge, each detector comprising: a light projector; a light receiver including a plurality of photoelectric conversion elements which are so disposed as to face said light projector across said lengthwise edge of the band-shaped travelling material, and a plurality of fine optical fiber elements supplied with light from the projector, said plurality of photoelectric conversion elements being optically connected to said optical fiber elements; and a plurality of switching circuits connected to said photoelectric conversion elements; and means coupled to the outputs of the switching circuits of the first and second detectors for generating a signal indicating the parallelism of the band-shaped material travelling on the delivery system upon receipt of outputs from the first and second detectors, said generating means comprising: a comparison circuit supplied with said outputs from the first and second detectors; an average circuit supplied with outputs from said comparison circuit during a prescribed length of time; and a display unit and an alarm unit both supplied with outputs from said average circuit.
Claim 3
Dependent Claim
54 words
A detecting apparatus according to claim 1 wherein said light receivers are partially blocked by said band-shaped material and wherein the switching circuits include a plurality of relays which are actuated when photoelectric outputs from the photoelectric conversion elements account for more than 50 percent of the output obtained when they are fully illuminated.
Claim 4
Dependent Claim
40 words
A detecting apparatus according to claim 1 wherein said alarm unit is activated when the difference between the values of the outputs of said detectors, which is a function of the output of said average circuit, exceeds a predetermined value.
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) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |