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One Company's Dilemma

Eliminates Need for Manually Inverting Sheets Reducing Risk of Injury to Personnel

Previously the only way to invert sheets printed on a top-printing machine for taping, gluing or stitching was to invert handfuls of sheets manually. The sheets could be small and light to very large and heavy requiring two individuals to invert the heavier sheets such as triple wall. The risk of injury (back, shoulders, etc.) was very likely. Inverting sheets manually is very time consuming as well. Cost and space requirements prohibited the use of a load-turner in such a small entity as ours. We therefore were compelled to find another way to safely and more efficiently invert sheets resulting in the SHEET INVERTER. It has served our purpose extremely well and working in conjunction with a folding attachment, enabled us to do custom work requiring the folding-in-half of individual sheets in the stacker backstop.

Inverts Sheet Sizes Equal to Your Machine's Design Limits

The length of the lifting fingers and the height to which they are lifted determines the maximum width of sheet that can be inverted. With the present design of the SHEET INVERTER, we are able to invert sheets up to 80" wide. The length of the sheet is limited only by the printing machine capabilities. To compensate for longer sheets, additional fingers may be added to the rotating beam. Alternately, fingers could be spaced farther apart. The present design inverts 140" sheets with no difficulty.

Inverts Single Sheets or Stacks of Sheets


The inverting process requires time. Larger sheets at lower machine speeds may not present a problem if running at a speed within the inverting process time requirements. However, smaller sheets must run at higher speeds. By interrupting the layboy drive through a clutch/brake arrangement, sheets can be stacked on the layboy conveyor belts in quantities sufficient to accommodate the inverting process. The SHEET INVERTER has been used to invert stacks of up to 10 sheets enabling normal machine production rates. Quantities will vary depending on the sheets.

Inverts Single Wall through Triple Wall Sheets

The dynamics of inverting single wall and triple wall sheets are dramatically different. Due to the rigidity of double and triple wall sheets they are easily inverted. However, light weight single wall sheets with deep flaps will tend to fold at the score line when being lifted at the lead edge of the flap. The lifting finger contact point on the flap is therefore adjustable by rotating lifting finger beam downwardly allowing fingers to reach further into the flap nearer the score line thereby reducing the tendency to fold. On sheets with especially deep flaps, pneumatic cylinders mounted on select fingers, can be extended moving the contact point yet further in on the flap. Stacking of sheets will also create additional rigidity. The present design has inverted single wall sheets with flaps up to 20" deep.

Universal Retrofit to any Stacker

The simplicity of the "bolt-on" design enables retrofitting to virtually any conventional stacker.

Utilizes Unused Space Above Stacker Bed

Most stackers will have unused space above the main conveyor bed. By utilizing this unused space, interference with normal operation or other attachments is minimized or eliminated.

No Pit or Additional Conveyor Systems Required

Most load-turners require a floor modification, such as a pit, to accommodate the turning process. Additional conveyors to load and unload sheets are also necessary. Valuable floor space must be used for equipment installation. With installation being above the main conveyor bed, the SHEET INVERTER uses no additional floor space or conveyor systems.

Minimal Air and Electrical Requirements

Energy requirements for the SHEET INVERTER are minimal, utilizing 3A. @ 120VAC and 35 CFM @ 120 PSI resulting in very cost effective operation.

User-friendly State-of-the-Art Electronic Process and Pneumatic Controls

Large LED readout control panel utilizes push button data entry. Panel-mounted pneumatic controls provide easy operator access. Adjustments can be made "on-the-fly".

Setup for Various Size Sheets Made Quickly

Changes to accommodate varying sheet sizes are made quickly through the control panel push button data entry feature.

Flip of Switch Places Inverter in Bypass Position Allowing Normal Operation


Simply flipping a switch places the SHEET INVERTER in "Bypass"
mode allowing conventional non-inverting operation of stacker. When in bypass mode, fingers are lifted to their uppermost position clear of any interference with normal sheet movement through stacker.

Click Here to watch a MPG movie of the Inverter in action!
(1.77 Meg File Size)

Greene Line Manufacturing will custom build a Die Cut Stacker-Sheet Inverter to your specifications and we will guarantee it to meet the specifications. Contact Us we are here to help you.


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