Dancer Control System Replacement
by CSI Technical Group
Dancer control can take on several different forms. The original method is an arm on a pivot connected to a resistor that usually provides an analog signal representing the position of the pivot arm as it rides on a loop of material. An encoder or pulse generator is yet another way, just more sophisticated, of providing dancer control feedback. All of these methods contact the material which is a potential disadvantage if the material is sensitive to touch or contact. A mechanical system could also have a system response time as an issue.Worse yet is the mechanical wear and tear on the dancer as it ages. Potentiometers can get dirty and quit working.A new method is to use laser distance sensors.A laser distance sensor is non-contact, and highly focused in one single spot. Note, there are versions that will give you a broad spot to average over large rough and uneven areas.The work to rip out an old mechanical control dancer and re-install another arm just do the same thing is, well, a lot of work.By using an analog distance sensor this sensor could be fastened above or below the web control loop with much greater success of integration both into the analog signal and the ease of mechanical installation.Sick has introduced an extremely low cost distance sensor to take advantage of state-of-the-art technology.Be sure to contact Control Source for the distance sensor catalogue.
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