Flexo Folder Gluer-Automatic Corrugated Box Folding Gluing Machine

Flexo Folder Gluer-Automatic Corrugated Box Folding Gluing Machine

Corrugated carton box folding machine relates to an apparatus for folding and gluing paperboard blanks (such as corrugated blanks or sheets) and in particular to an apparatus and method for automatically repositioning a helix blank contacting member When the machine is restarted and for automatically adjusting Which panel is folded first in the final stages of folding.
Corrugated carton box folding machine for folding and gluing of corrugated blanks, typically called a folder-gluer, is used in the corrugated board industry to convert a cut-out blank into a corrugated box. The folder-gluer is typically grouped as one in a series of machines operating in timed relationship to convert paperboard blanks, one-by-one, into boxes. The folder-gluer usually receives its feed from a creasing-slotting unit or a rotary die-cutter Which receives its feed directly or indirectly from a feeding unit. Between the feeding unit and the creasing-slotting unit or the rotary die-cutter can be one or more printing units. After the folder-gluer there is usually a counter-ejector. The folder-gluer ordinarily receives a blank with four side-by-side panels which are separated from one another by longitudinal creases and slots and With a glue tab associated With one of the outboard panels. The folder-gluer applies glue to the glue tab and folds each outboard panel relative to an adjacent inboard panel along the intervening crease and discharges fattened tube-shaped boxes.

Flexo folder gluer for corrugated box has been recognized to have a folder-gluer mechanism having a conveyor mechanism, a plurality of elongated helix folding assemblies for folding paperboard blanks and a mechanism to rotate each of the elongated helix folding assemblies. By using such a folder-gluer, the chance of “fish tailing” is substantially reduced independently of speed matching, the chance of folding in a cross machine direction is substantially eliminated, and folding is carried out smoothly (rather than abruptly) without any impacting force being applied.
The folder-gluer folds paperboard blanks fed one by one in timed sequence into the machine. The blanks each have a first panel and a second panel Which is separated from the first panel by an intervening crease. The first panel is folded With respect to the second panel along the intervening crease from an initial angular relationship between the panels, denoted herein as an entrance angle (the angle included between the first and second panels as the blank enters the folding operation), to a resulting angular relationship between the panels, denoted herein as an exit angle (the angle included between said first and second panels as the blank leaves the folding action).
The conveyor of the folder-gluer is adapted to transport the blanks one-by-one in a direction of travel with the second panel of each blank being moved along a plane of travel. The elongated helix folding mechanism has an elon gated helix blank contacting member and a shaft Which supports the helix blank contacting member. The helix blank contacting member has a longitudinal axis extending generally in the direction of travel. The shaft extends coaxially With and is rotatable about the longitudinal axis to cause rotation of the helix blank contacting member about the longitudinal axis. The mechanism rotating the elongated helix folding member includes a servo motor mounted to the shaft to rotate the shaft such that the helix blank contacting member is rotated about its longitudinal axis. The shaft has ends positioned to accommodate the entrance angle between the first and second panels and to fold the first panel until preselected exit angle between the panels is attained.

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