US3866053A
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: 1974-05-30
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Granted: 1975-02-11
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Expires: 1994-05-30
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 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 bandshaped material travelling on the delivery system.
Inventors
- 👤 Tokumatsu Emura
- 👤 Shigeo Kawabata
- 👤 Takashi Shimoma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:06
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/26; G01D5/32; G01D5/34; G01D5/342; G01B; G01B11/00; G01B11/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
315 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 spatially arranged along said lengthwise edge, in the direction of which it travels on the delivery system so as to detect the position of said edge, each detector comprising a first lens for focusing light from a light projector, a view mask bored with an opening in that section where light is Focused by said first lens, a second lens for further focusing the light image already obtained in the view mask, a photoelectric conversion element disposed in a position where light is focused by the second lens, a scanning drum located between the view mask and the second lens and perforated with at least one scanning slit and a synchronizing pulse generator associated with said scanning drum; and the means for generating a signal indicating the parallelism of the band-shaped material comprises means for shaping the wave form of outputs from the first and second detectors, a clock pulse generator, a first and a second AND gate supplied with outputs from the wave shaping means and clock pulse generator, a subtracting gate designed to produce a signal representing the difference between the numbers of output pulses from the first and second AND gates, a counter for counting a number of pulses generated with the rotation of the cutter of the shearing machine, an AND gate supplied with carry signals from the counter and outputs from the subtracting gate, and a display unit, an upper-lower limit alarm unit and a rejection output unit, the three last-mentioned members being supplied with outputs from the last-mentioned AND gate.
Claim 2
Independent Claim
315 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 spatially arranged along said lengthwise edge, in the direction of which it travels on the delivery system so as to detect the position of said edge, each detector comprising a first lens for focusing light from a light projector, a view mask bored with an opening in that section where light is Focused by said first lens, a second lens for further focusing the light image already obtained in the view mask, a photoelectric conversion element disposed in a position where light is focused by the second lens, a scanning drum located between the view mask and the second lens and perforated with at least one scanning slit and a synchronizing pulse generator associated with said scanning drum; and the means for generating a signal indicating the parallelism of the band-shaped material comprises means for shaping the wave form of outputs from the first and second detectors, a clock pulse generator, a first and a second AND gate supplied with outputs from the wave shaping means and clock pulse generator, a subtracting gate designed to produce a signal representing the difference between the numbers of output pulses from the first and second AND gates, a counter for counting a number of pulses generated with the rotation of the cutter of the shearing machine, an AND gate supplied with carry signals from the counter and outputs from the subtracting gate, and a display unit, an upper-lower limit alarm unit and a rejection output unit, the three last-mentioned members being supplied with outputs from the last-mentioned AND gate.
References Cited (Backward Citations)
US2643117A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |