Online tread length - Products

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The problem

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.

The solution

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

An important feature of the system is that the trailing edge sensor has an extended 800mm field of view meaning treads of up to 800mm length variation can be measured at random with no alteration to the system of movement of sensors.

System features:

Turnkey solution including laser sensor assemblies, mechanical frames, free standing controller and display.

Sensors mounted in a fixed position above the line.

Multiple laser lines for automatic tread alignment correction.

800mm of length variation possible with no alteration to system.

Real-time display of measured and target lengths.

Statistical reporting and network compatible.

Simple to set up, operate and maintain.

Measurement accuracy to <0.5mm.

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Mechanical assembly

Operator interface

Trend analysis