Apparatus and method for detecting defects in a moving web
AssigneeYoung Engineering, Inc.
InventorEbun A. Surka
Life of this patent
Estimating the term…
Abstract
Apparatus and method for monitoring a moving web for structural defects at a plurality of independent locations across the width of the web, determining the location and magnitude of a detected defect and controlling movement of the web responsive thereto. A plurality of light sensing elements may be employed operatively connected to a microprocessor. A separate edge sensor may be employed and is claimed.
Claims16
Apparatus for detecting discontinuity defects in a moving web comprising a plurality of light sensitive elements located across an intended path of travel for said web with said web being passable thereby between said elements and a source of light, said elements being actuatable by light from said source passing through a discontinuity defect in said web, said elements having a predetermined width and a predetermined spacing therebetween and monitoring substantially the full width of the web, and a programmable controller operatively associated with said elements to receive input therefrom when said elements are actuated by light passing through a discontinuity in said web, to determine the location and magnitude of a discontinuity in said web responsive to said input, to compare said input to preprogrammed defect data, and to control web movement dependent upon said comparison so that web stoppage is achieved only for those detected defects whose location, magnitude, or combined location and magnitude dictate same.
Apparatus for detecting separation defects in a moving web comprising:
- (a) a plurality of light sensitive elements located along a web path with a web being passable thereby between said elements and a source of light, said elements having a predetermined spacing therebetween and monitoring substantially the entire width of said web between opposite edges of same,
- (b) programmed control means operatively associated with said elements and operatively associable with means for moving said web, said control means being preprogrammed for different control outputs dependent upon the locations and sizes of detected defects, receiving input from elements actuated by light passing through a defect in said web, comparing said input to said preprogrammed data and providing control output dependend thereon;
- and
- (c) web edge separation detector means operatively associated with said control means, said edge detector means comprising means biased into engagement with a surface of said edge and being movable to an opposite surface of said edge upon detecting a separation in said edge, said control means providing web control output upon detection of an edge separation.
A method of detecting discontinuity defects in a moving web, comprising the steps of:
- (a) monitoring said web as it moves past a plurality of predetermined, independent locations spaced at substantially equal distances across the width of said web;
- (b) programming a control means with data for different control outputs dependent upon the location and sizes of possible defects;
- (c) generating a data signal from each of said locations when a defect is detected while monitoring said web;
- (d) transmitting said signals to said control means;
- (e) comparing data received from said signals with said programmed data to determine the location and size of said detected defects;
- and
- (f) controlling movement of said web dependent upon the location and/or size of said detected defects.
A method of detecting discontinuity defects in a moving web, comprising the steps of:
- (a) monitoring said web as it moves past a plurality of predetermined spaced independent locations acorss the width of said web;
- (b) programming a control means with data relating to known defects and expected consequences therefrom;
- (c) generating data relating to the magnitude and location of detected defects;
- (d) comparing said data generated from detected defects with data relating to said known defects and consequences;
- and
- (e) controlling further movement of said web in response to output signals resulting from said comparison.
Dependencies are inferred from the claim text.