US5000032A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Web position detecting method
Assignee: Fujifilm Corp
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Filing: 1989-11-17
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Granted: 1991-03-19
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Expires: 2009-11-17
Abstract
Abstract A web position detecting method and apparatus for a device which conveys a web floated with air streams jetted from air jetting holes. Pressure detecting units are positioned along both side edges of the web to detect the pressures of the air streams thereby to determine the position of the web in its widthwise direction by a difference of the pressures.
Inventors
- 👤 Hiroshi Nakashima
- 👤 Kiyoshi Okutsu
- 👤 Sanshirou Fukuhara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:50
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/42; G01D5/44; B; B65; B65H; B65H23/00; B65H23/02; B65H23/0204; B65H23/0212
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
191 words
A method for detecting a lateral position of a web, comprising the steps of: conveying a web over an air jetting box; jetting air streams through air jetting holes in said air jetting box toward said web, a plurality of said air jetting holes jetting air toward said web to support said web and at least one other of said air jetting holes jetting air toward said web and adjacent at least one edge of said web for use in detecting a lateral position of said web, said plurality of said air jetting holes and said at least one other air jetting hole being of substantially the same size and being in communication with a common source of air; positioning at least one pressure detecting unit adjacent at least one edge of said web facing said at least one other air jetting hole and on a side of said web opposite said air jetting box; detecting a total pressure in said at least one pressure detecting unit; using said detected pressure as an indication of a position of said web transverse to said direction in which said web is being conveyed.
Claim 2
Independent Claim
191 words
A method for detecting a lateral position of a web, comprising the steps of: conveying a web over an air jetting box; jetting air streams through air jetting holes in said air jetting box toward said web, a plurality of said air jetting holes jetting air toward said web to support said web and at least one other of said air jetting holes jetting air toward said web and adjacent at least one edge of said web for use in detecting a lateral position of said web, said plurality of said air jetting holes and said at least one other air jetting hole being of substantially the same size and being in communication with a common source of air; positioning at least one pressure detecting unit adjacent at least one edge of said web facing said at least one other air jetting hole and on a side of said web opposite said air jetting box; detecting a total pressure in said at least one pressure detecting unit; using said detected pressure as an indication of a position of said web transverse to said direction in which said web is being conveyed.
Claim 3
Dependent Claim
36 words
A method as recited in claim 1, wherein said positioning step positions two pressure detecting units adjacent opposite edges of said web and said detecting step detects a differential pressure between said two pressure detecting units.
Claim 4
Dependent Claim
34 words
A method as recited in claim 2, wherein said pressure detecting units have respective measuring apertures and wherein said positioning step aligns said apertures to be perpendicular to a major surface of said web.
Claim 5
Dependent Claim
43 words
A method as recited in claim 2, wherein said pressure detecting units have respective measuring apertures and wherein said positioning step aligns said apertures to be inclined toward a middle of said web in opposing directions to a major surface of said web.
Claim 6
Dependent Claim
24 words
A method as recited in claim 1, further comprising aligning said transverse position of said web according to said indication of said transverse position.
Claim 7
Dependent Claim
162 words
A position detecting device, comprising: an air jetting box having a plurality of air jetting holes for jetting air streams through said air jetting holes to support a web conveyed above said air jetting holes; and at least one other air jetting hole for jetting an air stream toward said web adjacent at least one edge thereof for use in detecting a lateral position of said web, said plurality of air jetting holes and said at least one other air jetting hole being of substantially the same size and being in communication with a common source of air; and at least one pressure detecting unit disposed adjacent an edge of said web facing said at least one other air jetting hole on a side of said web opposite said air jetting box, said at least one pressure detecting unit having a relatively large opening for receiving a total pressure of said air stream from said at least one other air jetting hole.
Claim 8
Dependent Claim
162 words
A position detecting device, comprising: an air jetting box having a plurality of air jetting holes for jetting air streams through said air jetting holes to support a web conveyed above said air jetting holes; and at least one other air jetting hole for jetting an air stream toward said web adjacent at least one edge thereof for use in detecting a lateral position of said web, said plurality of air jetting holes and said at least one other air jetting hole being of substantially the same size and being in communication with a common source of air; and at least one pressure detecting unit disposed adjacent an edge of said web facing said at least one other air jetting hole on a side of said web opposite said air jetting box, said at least one pressure detecting unit having a relatively large opening for receiving a total pressure of said air stream from said at least one other air jetting hole.
Claim 9
Dependent Claim
40 words
A position detecting device as recited in claim 6, wherein there are two pressure detection units disposed adjacent opposite edges of said conveyed web and further comprising means for measuring a differential pressure measured by said two pressure detecting units.
Claim 10
Dependent Claim
31 words
A position detecting device as recited in claim 7, wherein said two pressure detecting units have respective measuring apertures aligned to be perpendicular to a major surface of said conveyed web.
Claim 11
Dependent Claim
41 words
A position detecting device as recited in claim 7, wherein said two pressure detecting units have respective measuring apertures aligned to be inclined toward a middle of said conveyed web in opposing directions to a major surface of said conveyed web.
Claim 12
Dependent Claim
34 words
A position detecting device as recited in claim 6, further comprising means for controlling a transverse positioning of said conveyed web in response to an output of said at least one pressure detecting unit.
Claim 13
Dependent Claim
28 words
A method as recited in claim 1, wherein said pressure detecting step is performed by receiving an air stream from said air jetting holes having a uniform size.
Claim 14
Dependent Claim
51 words
A method as recited in claim 1, wherein said step of jetting air streams through air jetting holes comprises jetting air through air jetting holes in a surface of said air jetting box which faces said web and which is planar in a direction transverse to said direction of web movement.
Claim 15
Dependent Claim
32 words
A position detecting apparatus as recited in claim 6, wherein an surface of said air jetting box facing said web is planar in a direction transverse to a direction of web movement.
References Cited (Backward Citations)
US2539131A
Cited
US2687885A
Cited
US2884495A
Cited
US3039483A
Cited
US3159170A
Cited
US3243993A
Cited
US3342284A
Cited
US3363453A
Cited
US3494177A
Cited
US3608797A
Cited
DE1965231A1
Cited
US3863491A
Cited
SU506677A1
Cited
JPS60244806A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-03-18 | 1994-09-17 | 1995-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-03-18 | 1998-09-17 | 1999-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-03-18 | 2002-09-17 | 2003-03-19 | $7700.00 | Window Closed / Lapsed |