Blow moulding machine with compressed air recycling

Apparatus for shaping plastic preforms into plastic containers, comprising:

• a plurality of blow moulding stations, each of which has a cavity in which the plastic preforms can be shaped into plastic containers, said blow moulding stations being arranged on a movable carrier, each moulding station having
• a stretching rod which stretches the plastic containers in their longitudinal direction by a movement in a stretching direction;
• and
• a drive device for driving the stretching rod in the stretching direction;
• a guide cam which is arranged in a stationary manner and by means of which the stretching rod is movable counter to the stretching direction as a function of a movement of the blow moulding station, at least one portion of said guide cam being adjustable,
• wherein, by virtue of said adjustment, a dependency of the movement of the stretching rod counter to the stretching direction on the movement of the blow moulding station is variable, and
• wherein the guide cam is arranged on a holding device in such a way as to be displaceable along a predefined displacement travel and the holding device is a further guide cam which serves at least at times for moving the stretching rod, and wherein an arresting of the guide cam relative to the holding device is controlled by a valve device.

Apparatus for shaping plastic preforms into plastic containers, comprising:

• a plurality of blow moulding stations, each of which has a cavity in which the plastic preforms can be shaped into plastic containers, said blow moulding stations being arranged on a movable carrier, each moulding station having
• a stretching rod which stretches the plastic containers in their longitudinal direction by a movement in a stretching direction;
• and
• a drive device for driving the stretching rod in the stretching direction;
• a guide cam which is arranged in a stationary manner and by means of which the stretching rod is movable counter to the stretching direction as a function of a movement of the blow moulding station, at least one portion of said guide cam being adjustable;
• and
• a display device which outputs information characteristic of a position of the guide cam,
• wherein, by virtue of said adjustment, a dependency of the movement of the stretching rod counter to the stretching direction on the movement of the blow moulding station is variable.