Enveloping device

An enveloping device comprising:

• film feeding means for feeding a film in folded form in a longitudinal, feeding direction, said film having two overlapping webs extending in a transverse, width direction from a fold on one edge;
• an envelope making device for forming an envelope by cutting and fusing the folded film by pressing a heat cutter, that extends in the width direction of the film, against the film to divide and fuse the film in the middle of the longitudinal, feeding direction;
• envelope conveying means for conveying the envelope in the longitudinal, feeding direction;
• and
• an inserting device, disposed adjacent the conveying means, for inserting content into the envelope,
• wherein the envelope making device presses the heat cutter against the film while moving the heat cutter forward in the longitudinal, feeding direction while the envelope is being conveyed by the conveying means;
• wherein the inserting device inserts the content into the envelope while moving the content forward in the longitudinal, feeding direction while the envelope is being conveyed by the conveying means;
• and
• wherein the envelope conveying means comprises:
• a belt conveyor including a plurality of belts arranged to move parallel to each other in the longitudinal direction, each belt having formed therein a plurality of air vents extending along the longitudinal direction;
• a support body, disposed beneath and supporting the plurality of belts, said support body having formed therein a plurality of air grooves extending parallel to each other in the longitudinal direction below the plurality of air vents in the belts;
• suction means for generating suction in an air duct for applying suction to the plurality of air grooves and thereby to the plurality of air vents;
• and
• opening/closing means connecting the air duct with selected ones of said plurality of air grooves, for permitting and, alternatively, blocking the air duct from applying suction to said selected air grooves.