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US4737846A
Expired / Lapsed
US
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Device for detecting defects in single faced corrugated fiberboards
Assignee: Rengo Co Ltd
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Filing: 1987-05-28
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Granted: 1988-04-12
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Expires: 2007-05-28
Abstract
Abstract A device for detecting any defects in single faced corrugated fiberboard while it is running. A light is irradiated to the corrugated surface of the fiberboard and the striped image is scanned by an image pick-up unit and the picture signal is converted to binary-coded signal to discriminate the number of stripes or corrugations. The number is counted by a counter and compared with a normal number by a microcoputer. If there is too large a difference between them, the scanned part is judged as defective. This device can detect any defects in a running web at a sufficiently high speed to follow the line speed of a corrugating machine.
Inventors
- 👤 Masateru Tokuno
- 👤 Tetsuya Sawada
- 👤 Yasuharu Mori
- 👤 Ikuo Yoshimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:22
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/89; B; B31; B31F; B31F1/00; B31F1/20; B31F1/24; B31F1/26; B31F1/28; B31F1/2831; G01N21/8851; G01N2021/8887; G01N21/8914; G01N2021/8917; G01N2201/00; G01N2201/10; G01N2201/102
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
147 words
A device for detecting defects in a web of single faced corrugated fiberboard while it is running, said device comprising: a light source disposed near the track of said web for irradiating a light to the corrugated surface of said web to produce a striped image; an image pick-up means for scanning the striped image at a predetermined period by interlaced scanning in a direction perpendicular to the stripes on the striped image to convert the striped image to picture signals and giving the picture signals in a time series manner in synchronization with said period; a comparator means for converting said picture signals to binary-coded signals, the number of which corresponds to the number of stripes; a counter for counting the binary-coded signals; and a computer for comparing the count from said counter with a preset number to detect defects in the single faced corrugated fiberboard.
Claim 2
Independent Claim
147 words
A device for detecting defects in a web of single faced corrugated fiberboard while it is running, said device comprising: a light source disposed near the track of said web for irradiating a light to the corrugated surface of said web to produce a striped image; an image pick-up means for scanning the striped image at a predetermined period by interlaced scanning in a direction perpendicular to the stripes on the striped image to convert the striped image to picture signals and giving the picture signals in a time series manner in synchronization with said period; a comparator means for converting said picture signals to binary-coded signals, the number of which corresponds to the number of stripes; a counter for counting the binary-coded signals; and a computer for comparing the count from said counter with a preset number to detect defects in the single faced corrugated fiberboard.
Claim 3
Dependent Claim
22 words
The device as claimed in claim 1, wherein said light source is a stroboscope controlled by signals produced at predetermined time intervals.
Claim 4
Dependent Claim
30 words
The device as claimed in claim 1, wherein said image pick-up means is provided with a shutter, the opening of which is controlled by signals produced at predetermined time intervals.
Claim 5
Dependent Claim
52 words
The device as claimed in claim 1 further comprising a synchronized cursor generating means for generating cursor signals synchronized with said binary-coded signals and having a predetermined width, an error discriminating means for receiving said cursor signals to discriminate error to produce an error signal, said counter means counting said error signals.
Claim 6
Dependent Claim
22 words
The device as claimed in claim 4, wherein said light source is a stroboscope controlled by signals produced at predetermined time intervals.
Claim 7
Dependent Claim
30 words
The device as claimed in claim 4, wherein said image pick-up means is provided with a shutter, the opening of which is controlled by signals produced at predetermined time intervals.
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) | 1991-04-12 | 1991-10-12 | 1992-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-12 | 1995-10-12 | 1996-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-12 | 1999-10-12 | 2000-04-12 | $7700.00 | Window Closed / Lapsed |