Control provision operation for printing machines

Control provision for final control elements of a printing machine wherein a rotatable final control element is driven by a motor, comprising a pulse generating disk attached to the final control element of the printing machine and axially centered therewith, said disk having recesses regularly spaced from the axis;

• sensing means having two sensing points disposed at a radial distance from the axis suitable for engaging the recesses of the disk, said sensing means sensing the position of the recesses at said two sensing points;
• a recognition circuit connected to said sensing means and processing signals coming from said sensing means for recognizing the rotary direction of the final control element;
• an electronic counter connected to said recognition circuit and counting signals provided by said sensing means;
• a comparison circuit connected to the electronic counter;
• a set value provision connected to said comparison circuit and providing preset setting values, said comparison circuit comparing the results of counting with values provided by said set value provision to obtain a deviation signal;
• a device for reversal of a direction of rotation of the motor connected to said comparison circuit and to said recognition circuit and providing for reversal of direction of rotation of the motor upon appropriate deviation signal;
• gate means connected to the set value provision and to said device for reversal and providing a gate signal;
• and a motor control circuit connected to the motor and to the gate means and operative for controlling the final control element by employing the gate signal.