device for folding schließklappen to umschlagrohlingen

摘要

A machine for making envelopes and the like includes apparatus for folding both a top closure flap and a second latex fold flap in the bottom flap portion of the envelope blank. A feed roll feeds the envelope blank with the closure flap trailing onto a closure flap cylinder. The body of the envelope blank is conveyed along the surface of a folding cylinder onto support slats until the envelope blank front edge engages a stop member. The closure flap is engaged by vacuum on the closure flap cylinder and the latex fold flap is engaged by a second flap cylinder. A cam actuated tucker engages the bottom flap adjacent the score line for the latex fold flap and urges the envelope blank downwardly on the support slats. The rotating folding cylinder engages the body portion of the envelope blank and conveys the envelope blank toward a delivery device. Both the closure flap and the latex fold flap are engaged by the respective closure flap cylinders and are folded along the score lines by rotation of the respective flap cylinders in a direction opposite to the folding cylinder. Both of the flaps are creased along the fold line by the closure flap cylinder. The envelope blank is then transferred from the folding cylinder to a suitable spiral delivery.