Method and apparatus for forming notches for gussets for expandable envelopes

Method for folding and notching a pleated gusset member to form the end walls and the bottom wall of an expandable envelope comprising the steps of:

• placing the bottom wall portion of a gusset member on a first ridged surface of crests and grooves adapted to receive the pleats of the bottom wall portion with an end wall portion of the gusset member projecting beyond an end portion of the ridged surface,
• pressing the pleats of the bottom wall portion of the gusset member into the grooves of the ridged surface, and
• urging the pleats of the end wall portion of the gusset member against a second ridged surface of crests and grooves intersecting the first ridged side surface with the crests and grooves being commonly aligned, the urging of the pleats of the end wall against the second ridged surface folding the gusset member at the intersection of an end wall portion and the bottom wall portion of the gusset member and forming a notch extending from adjacent each groove of the end wall portion into the corresponding groove of the bottom portion adjacent the fold in the gusset member,
• providing a chamfered surface adjacent the intersection of the first ridged surface and the second ridged surface for accommodating the entry of notches upon the formation thereof during the step of urging, the step of urging the pleats of the end wall of the gusset member against the second ridged surface comprising the step of rolling a rotatable element against the end wall portion with respect to the grooves of the second ridged surface to force the pleats of the end wall portion into the second ridged surface, the rolling proceeding in an upward direction, while the rotatable element is in rolling engagement with the end wall portion of the gusset member, to adjacent the intersection of the first ridged surface and the second ridged surface to fold the end wall portion of the gusset member and to form the notches adjacent to the fold.

Apparatus for folding and notching a pleated member to form a folded corner in the pleated member comprising:

• a frame,
• a table mounted to said frame having a ridged upper surface of crests and grooves adapted to receive the pleats of the main portion of a pleated member when disposed thereon with an end portion of the pleated member projecting beyond an end portion of the table extending transversely to the crests and grooves of the ridge surface, the table having a ridged side surface of crests and grooves intersecting the ridged upper surface with the respective crests and grooves in alignment with one another,
• means mounted to said frame for pressing the pleats of the main portion of the pleated member into the grooves of the ridged upper surface of the table, the pressing means including an iron having a ridged lower surface of crests and grooves adapted to nest with respect to the ridged upper surface of the table to press the pleats of the main portion of the pleated member into the ridged upper surface of the table, the iron further having a vertical side wall intersecting the ridged lower surface, the vertical side wall being chamfered adjacent the intersection with the ridged lower surface to accommodate the entry of notches during the formation thereof,
• means mounted to said frame for urging the pleats of the end portion of the pleated member against the ridged side surface of the table adjacent the intersection of the ridged side surface and the ridged upper surface of the table to fold the pleated member at the intersection of an end portion and a main portion of a pleated member and to form a notch extending from adjacent each groove of the end portion into the corresponding groove of the main portion adjacent the fold in the pleated member, and
• means mounted to said frame for cyclically moving the urging means downwardly into engagement with the end portion of the pleated member, laterally to press the pleats of the end portion into the ridged side surface of the table, and upwardly while the urging means is in contact with the end portion of the pleated member to form the notches therein.

Method for folding and notching a pleated member to form a folded corner in the pleated member, comprising the steps of:

• placing the main portion of a pleated member on a first ridged surface of crests and grooves adapted to receive the pleats of the main portion with an end portion of the pleated member projecting beyond an end portion of the ridged surface,
• pressing the pleats of the main portion of the pleated member into the grooves of the ridged surface, and
• urging the pleats of the end portion of the pleated member against a second ridged surface of crests and grooves intersecting the first ridged side surface with the crests and grooves being commonly aligned, the urging of the pleats of the end portion against the second ridged surface folding the pleated member at the intersection of an end portion and the main portion of the pleated member and forming a notch extending from adjacent each groove of the end portion into the corresponding groove of the main portion adjacent the fold in the pleated member,
• providing a chamfered surface adjacent the intersection of the first ridged surface and the second ridged surface for accommodating the entry of notches upon the formation thereof during the step of urging, the step of urging the pleats of the end portion of the pleated member against the second ridged surface comprising the steps of moving a rotatable element downwardly into engagement with the end portion of the pleated member, laterally to press the pleats of the end portion into the ridged side surface of the table, and upwardly while the rotatable element is in contact with the end portion of the pleated member to form the notches therein.

Apparatus for folding and notching a pleated gusset member to form the end walls and the bottom wall of an expandable envelope, comprising:

• a frame,
• a table mounted to said frame having a ridged upper surface of crests and grooves adapted to receive the pleats of the bottom wall portion of a gusset member when disposed thereon with an end wall portion projecting beyond an end portion of the table extending transversely to the crests and grooves of the ridged surface, the table having a ridged side surface of crests and grooves intersecting the ridged upper surface with the respective crests and grooves in alignment with one another,
• means mounted to said frame for pressing the pleats of the bottom wall portion of the gusset member into the grooves of the ridged upper surface of the table, the pressing means comprising an iron having a ridged lower surface of crests and grooves adapted to nest with respect to the ridged upper surface of the table to press the pleats of the bottom wall portion of the gusset member into the ridged upper surface of the table, the iron further comprising a ridged side surface intersecting the ridged lower surface thereof, the crests and grooves of the ridged side surface of the iron being in alignment with those of the ridged side surface of the table when the iron is pressing the pleats of the bottom wall portion of the gusset member into the grooves of the ridged upper surface of the table, and
• means mounted to said frame for urging the pleats of the end wall portion of the gusset member against the ridged side surface of the table adjacent the intersection of the ridged side surface and the ridged upper surface of the table to fold the gusset member at the intersection of an end wall portion and a bottom wall portion of a gusset member and to form a notch extending from adjacent each groove of the end wall portion into the corresponding groove of the bottom portion adjacent the fold in the gusset member.

Apparatus for folding and notching a pleated gusset member to form the end walls and the bottom wall of an expandable envelope comprising:

• a frame,
• a table mounted to said frame having a ridged upper surface of crests and grooves adapted to receive the pleats of the bottom wall portion of a gusset member when disposed thereon with an end wall portion projecting beyond an end portion of the table extending transversely to the crests and grooves of the ridged surface, the table having a ridged side surface of crests and grooves intersecting the ridged upper surface with the respective crests and grooves in alignment with one another,
• means mounted to said frame for pressing the pleats of the bottom wall portion of the gusset member into the grooves of the ridged upper surface of the table, the pressing means comprising an iron having a ridged lower surface of crests and grooves adapted to nest with respect to the ridged upper surface of the table to press the pleats of the bottom wall portion of the gusset member into the ridged upper surface of the table, the ridged lower surface of the iron being curved to enable the iron to be rolled into a nesting relationship with the ridged upper surface of the table, and
• means mounted to said frame for urging the pleats of the end wall portion of the gusset member against the ridged side surface of the table adjacent the intersection of the ridged side surface and the ridged upper surface of the table to fold the gusset member at the intersection of an end wall portion and a bottom wall portion of a gusset member and to form a notch extending from adjacent each groove of the end wall portion into the corresponding groove of the bottom portion adjacent the fold in the gusset member.