5 Station A-Frame Powered Unwind

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As material is pulled from the parent material roll, tension on the material web causes the dancer to begin to swing forward while the pneumatic cylinders attempt to resist this motion.

At the same time, the dancer position encoder senses this movement and sends a signal telling the VFD to engage, thus allowing the parent material roll to begin unwinding more material at a controlled rate based on the dancer position.

Once the tension of the web is overcome by the resistance provided by the dancer cylinders, the dancer swings back to a stable position providing a stable web tension. As the web tension decreases, the dancer moves back, and more brake is automatically applied, via the VFD, to the parent material roll... always trying to maintain the dancer in "mostly" vertical position. The relationship between the dancer and the VFD is essential in establishing a smooth, stable material web for the sheeter to process accurately and at the fastest speeds possible.

Each material unwind module is connected to the sheeter/stacker controls via an Ethernet cable where the major changes necessary for proper operation of each unwind can be made at a single touchscreen interface.    

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Specifications: (as pictured)

• 5 each A – frame unwinds

• 1,000 pound roll maximum

• 5 each 3” airshafts

• 48” roll outside diameter

• 60” maximum web width

• Unwinds tied together to allow running 5 webs at one time

• Air brake system on the unwind

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*Full customization available‍

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