The WSA Top Print Dual Inverter Prefeeder was first introduced in 2004 and features a unique dual block inverter system which minimizes cycle time. This model is designed for midsize and larger high speed top print flexo folder gluers which run up to 350 sheets per minute. Some of the standard features of the WSA Top Print Dual Inverter Prefeeder are as follows: 
 

• Auxiliary Stack Separation and Stack Centering Zone with Plastic Belt Infeed Conveyor 
• Finger Style Block Pusher for improved handling of warped board. 
• Block Squaring Arms for re-squaring of sheets before shingle gate.
• Deck Snubbing Wheels for control of sheets entering press hopper
• Side and Rear Hopper Tampers for squaring sheets in hopper
• Fully Automatic Setup interfaced with Press
• Color Touch Screen Operator Interface with complete machine diagnostics. 
• Automatic Bottom Sheet Waste Discharge to Operator Side
• Omron Allen Bradley (or Allen Bradley) PLC
• SICK Safety Sensors 
• All name brand and commercially available components. 
• Optional Air Infusion System for improved handling of E flute.