Method and apparatus for calibration and adjustment of inserter for sheeted material

Apparatus for calibration and adjustment of an inserter working with air suction for picking up a sheeted or folded material one at a time from a bundle for insertion in a machine, comprising:

• an inserter (5) including means for producing air suction to pick up a sheeted or folded material one at a time from a bundle for insertion of the picked up sheeted or folded material into a machine;
• a sensor (24) positioned adjacent said inserter (5) and arranged for transmitting different output signals which correspond respectively to no sheet of material picked up, one sheet of material picked up or several sheets of material picked up;
• said means for producing air suction in said inserter (5) including an individually driven variable air suction source (19);
• and
• means coupled to said sensor (24) for controlling said variable air suction source (19) responsive to the output signal from said sensor (24) such that said air suction source produces increased suction if said sensor output signal corresponds to no sheet of material picked up or decreased suction if said sensor output signal corresponds to more than one sheet of material picked up.