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US 5,000,032 AGranted
Web position detecting method
AssigneeFuji Photo Film Co., Ltd.
InventorsHiroshi Nakashima, Kiyoshi Okutsu, Sanshirou Fukuhara
Life of this patent
Estimating the term…
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.
Claims13
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.
2 more elements
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.
1 more element
Dependencies are inferred from the claim text.