A multi-cylinder driven movement unit comprising:
- a first cylinder means having a unitary length drive stroke;
- a second cylinder means having a drive stroke twice the length of said first cylinder means drive stroke unitary length;
- a third cylinder means with a drive stroke four times the drive stroke of said first cylinder means;
- with said cylinders by activation singularly and in combinations providing drive of said driven movement unit in steps of one, two, three, four, five, six and seven unitary length settings in the cylinder drive determined position of said driven movement unit;
- a lead screw is included along with an internally threaded slider block means mating said lead screw and driven back and forth by said lead screw dependent on the rotational drive direction the lead screw is driven through a stroke of unitary length between travel limits equal in length to the unitary length drive stroke of said first cylinder;
- and support and guide means for said lead screw driven slider block means;
- a drive motor including a drive connection is mounted on said support and guide means for said lead screw;
- all said cylinder means are double acting cylinders power activated alternatively in both directions subject to fluid pressure being applied to one or the other of the two chambers of the respective cylinders and the other chamber opened to relieve pressure;
- valve means is connected for selectively feeding fluid pressure to one or the other of the two chambers of the respective cylinders and opening the other of the two chambers to relieve pressure;
- said valve means is a plurality of solenoid valves one for each of said cylinders;
- programmable logic controller means is connected to said plurality of solenoid valves for selective programmed control of said movement unit;
- a power source controlled by said programmable logic control is connected to said drive motor;
- rotation sensing means is mounted on the drive connection to said lead screw;
- and signal pickup and transmitting means is connected to control means having a switch control output for switch-off of power to said drive motor upon said lead screw having been rotated to a programmed position for finely determined controlled positioning of said slider block means;
- said movement unit is mounted on a vertically moveable carriage means;
- drive means for vertically positioning said carriage means;
- vertically extended mount and guide means positioned on a rotatable base for vertically guiding said carriage means;
- and drive means for rotating said rotatable base;
- and wherein said movement unit has a first section and a second section;
- a plurality of said cylinders on said second section connected for moving said first section through a range of travel;
- rail guide and mount means on said first section mounted on said carriage means;
- and said rail guide and mount means being of sufficient length to accomodate the full range of travel of the said first section.