Machine for manufacturing flat bottom bags

A system for making flat bottom bags comprising:

• a blank of flattened tubular form;
• a machine that engages the blank, the machine comprising:
• a rotating drum to drive the blank of flattened tubular form in a direction of advance, wherein the rotating drum comprises:
• a first element carrying a front pincher that pinches a front edge of the blank on the drum, in an opening stage, and drives the blank;
• and
• a second element carrying a first lateral pincher that pinches lateral edges of the blank at the first fold line, wherein the second element is pivotally mounted in relation to the first element around a rotational axis of the rotating drum;
• and
• a first scoring apparatus upstream of the rotating drum that marks on the blank a first fold line transverse to a direction of advance;
• a first adjusting apparatus that introduces an offset into a drive movement between the first element and the second element to adjust, during production, while the rotating drum is rotating and the blank is being processed by the machine, both a distance between the front edge and the first fold line and a relative angular position of the front pincher and the first lateral pincher, wherein the first adjusting apparatus comprises a reduction gear allowing an angular offset to be introduced between a first drive of the first element and a second drive of the second element, wherein the reduction gear comprises:
• a first planetary gear wheel having a first rotation axis and meshing with a first satellite;
• and
• a second planetary gear wheel having a second rotation axis and meshing with a second satellite, wherein the first rotation axis is identical to the second rotation axis and the first satellite and the second satellite are attached to a satellite rotation shaft;
• a first reduction ratio of the first wheel and the first satellite is different than a second reduction ratio of the second wheel and the second satellite;
• the satellite rotation shaft is rotatably mounted on a satellite holder, which is pivotally mounted around the first rotation;
• the first planetary gear receives movement from a motor, and the second planetary gear transmits the movement to one of the first drum element and the second drum element;
• wherein modification of a position of the satellite holder introduces an offset into the movement between the first element and the second element and the first element and the second element are angularly offset even when the drum is rotating.