Patent US3667283A successfully refreshed from Google Patents.
US3667283A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for measuring thickness of sheet material
Assignee: Fujifilm Holdings Corp
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Filing: 1970-05-01
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Granted: 1972-06-06
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Expires: 1990-05-01
Abstract
Abstract A stationary thickness gauge is combined with a movable thickness gauge to measure the true thickness in the lateral direction of a running web or sheet material. The movable thickness gauge is moved in a direction transverse to the running direction of the web or sheet.
Inventors
- 👤 Haruo Takenaka
- 👤 Hiroshi Okuyama
- 👤 Noburo Hibino
- 👤 Eiichi Ohta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:26
CPC Classifications
G; G01; G01B; G01B5/00; G01B5/02; G01B5/06; G01B5/068
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
251 words
Apparatus for measuring the thickness of an advancing continuous sheet material comprising: a. stationary thickness gauge means for measuring the thickness of said sheet as said sheet advances past said stationary thickness gauge means in the longitudinal direction; b. first calculating means, coupled to the output of said stationary thickness gauge means, for calculating the average value of the output of said stationary thickness gauge means; c. second calculating means, coupled to the output of said stationary thickness gauge means and the first calculating means, for calculating the difference between the outputs of the stationary thickness gauge means and the first calculating means; d. movable thickness gauge means adapted to move in a direction transverse to the direction of movement of the advancing sheet for measuring the thickness of said advancing sheet; e. third calculating means, coupled to the output of said movable thickness gauge means, for calculating the average value of the output of the movable thickness gauge means; f. fourth calculating means, coupled to the output of said movable thickness gauge means and said third calculating means, for calculating the difference between the outputs of the movable thickness gauge means and the third calculating means; and g. fifth calculating means, coupled to the output of said second calculating means and said fourth calculating means, for calculating the difference between the outputs of the second calculating means and the fourth calculating means whereby the output of the fifth calculating means is equal to the true thickness of said continuous sheet.
Claim 2
Dependent Claim
251 words
Apparatus for measuring the thickness of an advancing continuous sheet material comprising: a. stationary thickness gauge means for measuring the thickness of said sheet as said sheet advances past said stationary thickness gauge means in the longitudinal direction; b. first calculating means, coupled to the output of said stationary thickness gauge means, for calculating the average value of the output of said stationary thickness gauge means; c. second calculating means, coupled to the output of said stationary thickness gauge means and the first calculating means, for calculating the difference between the outputs of the stationary thickness gauge means and the first calculating means; d. movable thickness gauge means adapted to move in a direction transverse to the direction of movement of the advancing sheet for measuring the thickness of said advancing sheet; e. third calculating means, coupled to the output of said movable thickness gauge means, for calculating the average value of the output of the movable thickness gauge means; f. fourth calculating means, coupled to the output of said movable thickness gauge means and said third calculating means, for calculating the difference between the outputs of the movable thickness gauge means and the third calculating means; and g. fifth calculating means, coupled to the output of said second calculating means and said fourth calculating means, for calculating the difference between the outputs of the second calculating means and the fourth calculating means whereby the output of the fifth calculating means is equal to the true thickness of said continuous sheet.
Claim 3
Dependent Claim
98 words
ApparatUs for measuring the thickness of a sheet material as defined in claim 1, wherein said stationary thickness gauge means is separated from said movable thickness gauge means in the longitudinal direction of said advancing sheet material, and wherein said apparatus further includes a means for memorizing a first measured thickness and reproducing said first measured thickness after a predetermined time so that said first measured thickness may be compared with a second measured thickness at a point on the same lateral line of said advancing sheet material as that at which said first measured thickness was measured.
Claim 4
Dependent Claim
31 words
Apparatus for measuring the thickness of a sheet material as defined in claim 1, wherein said stationary thickness gauge means is disposed in close relationship with said movable thickness gauge means.
Claim 5
Dependent Claim
72 words
Apparatus for measuring the thickness of a sheet material as defined in claim 1 further including coating means for applying a coating layer to said sheet material wherein said stationary thickness gauge means measures the thickness of said material prior to the application of said coating and said movable thickness gauge means measures the combined thickness of said material and said coating whereby said apparatus measures the true thickness of said coating.
Claim 6
Independent Claim
195 words
A method for measuring the thickness of an advancing continuous sheet material comprising the steps of: a. measuring the thickness of said sheet with a stationary thickness gauge means as said sheet advances past said stationary thickness gauge means in the longitudinal direction; b. calculating the average value of the output of said stationary thickness gauge means; c. calculating a first difference equal to the difference between the output of said stationary thickness gauge means and the calculated average of the output of the stationary thickness gauge means; d. measuring the thickness of said advancing sheet with a movable thickness gauge means adapted to move in a direction transverse to the direction of movement of the advancing sheet; e. calculating the average value of the output of said movable thickness gauge means; f. calculating a second difference equal to the difference between the output of the movable thickness gauge means and the calculated average of the output of the movable thickness gauge means; and g calculating a third difference equal to the difference between said first difference and said second difference whereby said third difference is equal to the true thickness of said continuous sheet.
Claim 7
Independent Claim
195 words
A method for measuring the thickness of an advancing continuous sheet material comprising the steps of: a. measuring the thickness of said sheet with a stationary thickness gauge means as said sheet advances past said stationary thickness gauge means in the longitudinal direction; b. calculating the average value of the output of said stationary thickness gauge means; c. calculating a first difference equal to the difference between the output of said stationary thickness gauge means and the calculated average of the output of the stationary thickness gauge means; d. measuring the thickness of said advancing sheet with a movable thickness gauge means adapted to move in a direction transverse to the direction of movement of the advancing sheet; e. calculating the average value of the output of said movable thickness gauge means; f. calculating a second difference equal to the difference between the output of the movable thickness gauge means and the calculated average of the output of the movable thickness gauge means; and g calculating a third difference equal to the difference between said first difference and said second difference whereby said third difference is equal to the true thickness of said continuous sheet.
Claim 8
Dependent Claim
69 words
Apparatus for measuring the thickness of a coated layer comprising a stationary thickness gauge means disposed on an uncoated portion of a continuous advancing sheet material, and a movable thickness gauge means disposed on a coated portion of said sheet material calculating means coupled to said stationary thickness gauge means and said movable thickness gauge means for calculating the true thickness of said sheet material with said coated layer.
Claim 9
Dependent Claim
69 words
Apparatus for measuring the thickness of a coated layer comprising a stationary thickness gauge means disposed on an uncoated portion of a continuous advancing sheet material, and a movable thickness gauge means disposed on a coated portion of said sheet material calculating means coupled to said stationary thickness gauge means and said movable thickness gauge means for calculating the true thickness of said sheet material with said coated layer.
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) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |