Veb Polygraph Leipzig Kombinat Fur Polygraphische Maschinen Und

Veb Polygraph Leipzog Kombinat Fur Polygraphische Maschinen Und

Klaus Schanze

Karl-Heinz Forster

Werner Lein

Albrecht Johne

Lothar Vetter

Kurt Reichenberger

A sheet printing station is arranged between a sheet pick-up station and a sheet discharge station. A plurality of linear motors is provided, including electrically conductive rails which constitute the stators of the motors and are mounted at opposite lateral sides of the stations. Each of the rails form an endless loop which connects all of the stations. One or more carriages are mounted on the rails for travel along the same and constitute the armature of the respective motors. Sheet grippers are arranged on the carriage or carriages, and a control arrangement controls the travel of the carriage or carriages along the rails.

Printing machine

A sheet-representing signal is registered by successive shift-register stages in simulation of the travel of a sheet through a printing machine. Signal detectors connected to different register stages actuate moving units which in turn change the state of activation of the functional units of the printing machine. Upon a changeover from one-side to two-side printing, there arises a sheet travel path length change composed of a fixed component determined by machine geometry and a variable component determined by sheet length. Each moving unit moves cyclically and can move the associated functional unit only during a certain portion of the cycle. Upon a printing mode changeover, moving units undergo a phase shift of their cycles of motion and signal detectors are disconnected from certain register stages and reconnected to others, thereby compensating for the variable and fixed components of the sheet travel path length change.

Control system for multi-color rotary printing machines, especially for

In first and second modes, the arrangement prints on only one side or on both sides of a sheet, respectively. A sheet is transported along a predetermined path through the arrangement and passes printing devices cooperating to effect printing of the sheet. Changeovers from one to the other mode alter a portion of the sheet transport path, changing its length. A control system for the arrangement includes a shift register. When a sheet arrives at a predetermined location along the path, a sheet-representing signal is applied to the shift register. Shifting pulses applied to the shift register in synchronism with sheet travel cause the sheet-representing signal to travel through the shift register in simulation of sheet travel. As the sheet-representing signal reaches preselected shift-register stages, it causes an actuator associated with such stage to actuate a respective printing device. Thus, the printing devices are controlled in dependence upon the arrival of the sheet at predetermined portions of the path. Upon a change of operating mode, a compensating unit is operable for at least partially offsetting changes in the correlation between shift register stages of the shift register and the associated portions of the path.

Growing community of inventors

Coswig, Germany

Klaus Schanze