Device for printing-pressure control

US4351237A · kind A · utility

Assignee

• VEB Kombinat Polygraph Werner Lamberz Leipzig · DE

Inventors

• Hans-Jurgen Tappert · Coswig, DE
• Horst Schulz · Friedrichshafen, DE
• Hans Johne · Radebeul, DE
• Albrecht Johne · Dresden, DE

Key dates

• Filing date: Jun 5, 1980
• Grant date: Sep 28, 1982
• Expiry date: Jun 5, 2000

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B41F13/24
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

A pressure control arrangement for controlling pressure between a printing roller and an offset roller by measuring a force exerted in a bearing of the printing roller when the latter rotates with an angle .psi.. The arrangement includes a piezoelectric pickup positioned on the internal surface of the bearing of the printing roller, a measured pressure value processor for receiving a signal from the piezoelectric pickup, an indicator generating a signal corresponding to a desired pressure value and means to compare the first abovementioned signal with the second mentioned signal. The arrangement also includes a positioner circuit which receives the compared signal and applies the same to a drive member which adjusts the position of the bearing of the offset roller thereby adjusting printing pressure between two contacting rollers for printing on sheets of paper.