Online tread length
The manufacturing tolerance of the skiver cutting process on tyre treads is often 10-15mm and is a significant source of waste when they are cut oversize. Commonly operators periodically measure tread length with a tape measure which is inaccurate, variable and unable to detect variations in the skiver cutting process.
Several attempts have been made to automate the measurement process using camera systems with external lighting. However these systems are sensitive to ambient light and are unable to reliably detect the cut edges.
Sigmavision’s online tread length measurement system comprises two laser sheet of light sensors that are positioned above the conveyor to detect the leading and trailing edges of the tread as it passes beneath the sensors. Multiple laser lines are projected in order to correct for any lateral misalignment of the tread. By calibrating the position of the sensors the tread length can be calculated. Read more