Envelope blank forming machine

An envelope blank forming machine to form either generally rectangular booklet envelope blanks or generally diagonal envelope blanks from a web comprising,

• pull rolls including means to pull the strip of paper from the web and feed the strip into the blank forming machine, said pull rolls positioned in a perpendicular position relative to the axis of the machine to feed the strip axially into the machine when forming booklet envelope blanks, means to move said pull rolls to an angular position relative to the axis of the machine to feed the strip at an angle to the axis of the machine for forming diagonal blanks,
• a rotatable cutoff knife positioned in a perpendicular position relative to the axis of the machine and perpendicular to the strip to cut booklet envelope blanks from the strip having a generally rectangular configuration, means to move said rotatable cutoff knife to an angular position relative to the axis of the machine and the strip to cut the strip diagonally to the strip axis to form a blank having a diagonal configuration,
• a first removable turnbar positioned upstream of said pull rolls, said first turnbar arranged at an angle to the axis of the blank forming machine, said turnbar including means to angularly change the direction of the strip from a direction aligned with the axis of the machine to an angular direction, said first turnbar being removed from the machine during the forming of booklet envelope blanks,
• a second removable turnbar positioned in spaced relation to said first turnbar and arranged at an angle to the axis of the blank forming machine, said second turnbar including means to control the direction of movement of the strip to said pull rolls so that said strip moves at an angle to the axis of the machine, said second turnbar being removed from the machine during the forming of booklet envelope blanks,
• separating rolls rotating at a peripheral speed greater than the linear speed of said strip positioned downstream of said cutoff knife to separate and space said blanks from each other,
• retractable, rotatable trimmer knives positioned downstream from said separating rolls to trim the pointed ends from a diagonal blank, retracting said rotatable trimmer knives into an inoperative position when forming rectangular envelope blanks,
• seal flap cutters positioned downstream of said trimmer knives, said seal flap cutters including means to remove portions of said envelope blank and form seal flaps on booklet envelope blanks and seal flap corners on diagonal blanks,
• first bottom flap cutters positioned downstream of said seal flap cutters, said first bottom flap cutters including means to remove portions of said envelope blank and form a portion of the bottom flap on both the booklet envelope blank and the diagonal envelope blank, and
• rotatable second bottom flap cutters positioned downstream of said first bottom flap cutters, said second bottom flap cutters including means to remove other portions of said booklet envelope blank and form a bottom flap on said booklet envelope blank, said rotatable second bottom flap cutters also including means to remove portions of the diagonal envelope blanks and trim the bottom seal flap edge of the diagonal envelope blank.