Leveraging servo technology, the new software functionality lets designers reduce the number of wear-prone components, including pneumatics, in production and packaging machines. As a result, dancer-less web handling can reduce machine footprint, OEM engineering times and end user maintenance tasks.
Dancer-less film winding and unwinding uses synchronized servo-driven film reel and nip roll assemblies for web draw and tension control. Typically, the designer replaces a dancer arm assembly with a rigidly mounted guide roll to incorporate a force transducer providing feedback allowing the PacDrive automation controller to perform real-time proportional integral (PI) control for tensioning.
However, for simple applications, motor current feedback may be used instead of a transducer. An advanced algorithm continuously calculates the change in web roll diameter to automatically maintain the proper synchronization between the servos controlling the web wind/unwind reel and nip rolls.
Available as an optional upgrade in the IEC 61131-3 conforming library UnWinder, the Function Block allows the programmer to simply enter parameters for a given application. It is offered as an alternative to the library’s existing dancer-based winding Function Block.
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Schneider Electric ELAU Packaging Solutions is the only automaton system in the world purpose-built for packaging machinery. Schneider Electric ELAU Packaging Solutions equips over $1 billion worth of packaging machines annually, with over 45,000 systems already deployed worldwide.
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