Printing arrangement alternatively operated for one-side printing and two-side printing with control system therefor

US3946669A · kind A · utility

Assignee

• VEB Polygraph Leipzig, Kombinat fur Polygraphische Maschinen und Ausrustungen · DE

Inventors

• Albrecht Johne · Dresden, DE
• Karl-Heinz Forster · Dresden, DE
• Klaus Schanze · Coswig, DE

Key dates

• Filing date: Nov 9, 1973
• Grant date: Mar 30, 1976
• Expiry date: Nov 9, 1993

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B41F33/08
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

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 regi…