Method and device for monitoring web bagginess
OwnerTodd E. Clapp, John J. Costelloinventors
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Abstract
A method of monitoring bagginess of a web transverse to a longitudinal direction of the web is disclosed. The method includes projecting a first reference light onto a front face of the web transverse to the web, and projecting a first measurement light onto the front face of the web non-perpendicular to the front face and transverse to the web. The longitudinal distance on the front face of the web between a point along the first reference light and a corresponding point along the first measurement light are compared to determine bagginess of the web. A method of monitoring bagginess of a web in the longitudinal direction of the web is also disclosed.
Claims21
A method of monitoring bagginess of a web transverse to a longitudinal direction of the web, comprising the steps of:
- projecting a first reference light at a first angle from a first light source onto a front face of the web transverse to the web;
- projecting a first measurement light at a second angle from a second light source onto the front face of the web non-perpendicular to the front face and transverse to the web, wherein the first angle is different from the second angle;
- and
- comparing a longitudinal distance on the front face of the web between a point along the first reference light and a corresponding point along the first measurement light to determine bagginess.
An apparatus for monitoring bagginess of a web, comprising:
- a first light source which projects a first reference light onto the front face of the web in a direction that is perpendicular to the front face of the web and is one of generally transverse and generally longitudinal to the web;
- and
- a second light source which projects a first measurement light onto the front face of the web in a non-perpendicular direction to the front face of the web and generally parallel to the first reference light so that any perpendicular distance between a point along the first reference light and a point along the first measurement light can be viewed to determine web bagginess.
A method of monitoring bagginess of a web in a longitudinal direction of the web, comprising the steps of:
- projecting a first reference light at a first angle from a first light source onto a front face of the web longitudinal to the web;
- projecting a first measurement light at a second angle from a second light source onto the front face of the web non-perpendicular to the front face and longitudinal to the web, wherein the first angle is different from the second angle;
- and
- comparing a transverse distance on the front face of the web between a point along the first reference light and a corresponding point along the first measurement light to determine bagginess.
Dependencies are inferred from the claim text.