VMI Group - Technology meets success
VMI Group - Technology meets success

Wig-Wag Electric Stacker

The Wig-Wag Electric (WWE) Stacker is designed for the automatic stacking of one, two or more strips of rubber compound up to 200 mm wide in one or two boxes or on pallets.

The stacking is based on moving the strip at a fixed height, longitudinally and laterally over the box or pallet. The system pulls the strips out of a strip cooling system or cooling rack. It is electrically operated, with frequency controlled continuously variable speeds of all movements.

Product highlights

  • Easy accessible and maintenance friendly design
  • Accurate stacking in boxes and on pallets
  • Available in single, dual and triple strip stacking and various drive versions


The strips are pulled out of a preceding cooler by the strip stacker's pull-in rollers. At the start, the leading ends of the cooled (and dried) strips are to be taken out of the preceding equipment manually and to be fed manually into the stacker heads with the pull-in rollers.

For this reason the stacker heads can be moved manually over a short distance when the leading ends are to be introduced. As soon as the leading end of each strip is caught by the pull-in rollers of the stacker head, the process of stacking the strip can continue automatically.

The frequency controlled motor drives the stacker arm (or arms) via a timing belt which move in lateral and longitudinal direction. The length of travel in lateral direction of the stacker arm(s) can be adjusted to the exact width of your boxes or pallets by shifting two inductive sensors. On top of the main frame, a long horizontal guiding roller and some vertical adjustable guiding rollers are mounted to guide the strips towards two diabolic-shaped guiding rollers which are mounted overhead of the stacker heads.  A motor is connected to the stacker head by means of a timing belt. This allows the stacker head to move in longitudinal direction and drives the pull-in rollers.

Ten inductive sensors limit the longitudinal and lateral movements of the two stacker heads. Shifting these sets of sensors adapts the travel of the stacker heads to the width and to the length of the boxes or pallets which are used for stacking the strips.

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