The WSA Top Print Overturn Prefeeder was first introduced in 2003 and is designed for today’s most advanced top printing Mini-line and Mid-Size Flexo Folder Gluers that run at speeds of up to 450 sheets per minute and which feature very quick setups. This model inverts the entire stack in one motion, advances the stack onto an extendo conveyor and into a pre-hopper, and then delivers a continuous shingle of board to the press. This design maximizes the amount of board which can be stored on the extendo conveyor and delivers the most consistent stream of board to the press even when handling very small blank sizes. Some of the standard features of the WSA Top Print Overturn Prefeeder are as follows: 
 
 

• Auxiliary Stack Separation and Centering Zone with Plastic Belt Infeed Conveyor 
• Small Blank Stabilizer Arm for handling very narrow sheets
• Stack Inverter with vacuum control of bottom sheet 
• Bottom Sheet Waste Discharge system for only removing the bottom sheet
• Pre-hopper with sheet squaring arms 
• 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. 
• 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.
• Optional Automatic Bottom Sheet Waste Discharge to Operator Side