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Fill Level Monitoring When Unwinding Labels with Retro-Reflex Sensors

When automatically rolling out and applying labels, it is important to ensure that there is enough material on the roller and that there is no interruption in the process. The retro-reflex sensor serves as an early warning system to permanently check the material supply of label or film unwinders and thus prevent idle running. If there is too little material on the roller, it detects the reflector installed opposite it and switches. This allows the operator to replace the roller in good time. The required roller thickness can be individually adjusted thanks to the visible light spot.

Retro-Reflex Sensors

Retro-reflex sensors for roller conveyors work according to the through-beam mode. Light is sent to a reflector mounted opposite the sensor that is then reflected back. If the light beam is interrupted by the object on the conveyor, the sensor is switched. The use of red light enables even shiny and black objects to be detected.

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