Online width measurement and alignment

The problem

Camera systems with backlit illumination are often used to measure sheet width online and to provide closed loop feedback to alignment systems. However, these systems can only detect the edges of a sheet or extrusion using a shadow principle and are not able to measure the cross sectional profile of the product. This is a major problem where the product needs to be aligned according to the positions of features on the product, eg treads shoulders, rather than the edges. In addition conventional backlit camera systems:

 

Must be mounted high above the line and are problematic where access is limited around production equipment

Cannot be used if the product is on a continuous belt conveyor or is produced on a backing sheet

Cause alignment errors when edges are feathered

 

The solution

Sigmavision offers bespoke laser sheet of light sensor solutions to measure product width or cross sectional profile and to provide digital or analogue feedback to alignment systems. Sensors may be configured depending on the total product width and measurement accuracy required and software tailored to the product features that need to be detected such as the stepped edges of a cushion / liner complex or shoulders of a tread extrusion. Read more