Method of operating a rotary printing press

Patent metadata

Field	Value
Publication number	US-2021178747-A1
Application number	US-202017119178-A
Country	US
Kind code	A1
Filing date	Dec 11, 2020
Priority date	Dec 17, 2019
Publication date	Jun 17, 2021
Grant date	—

Abstract

In a method for operating a rotary printing press, preferably a flexographic printing press that processes webs, disturbances of a rotating printing cylinder are detected and reduced by changing the printing speed. Here, the disturbances are detected at an actuating drive of the printing cylinder. This leads to a cost-efficient way of printing without disturbances.

First claim

1 . A method of operating a rotary printing press, the method comprising:
during an operation of the printing press, detecting disturbances of a rotating printing cylinder by monitoring an actuating drive of the printing cylinder; and when disturbances at the printing cylinder are detected via the actuating drive of the printing cylinder, changing a printing speed of the rotary printing press in order to reduce or eliminate the disturbances.

2 . The method according to claim 1 , which comprises, when disturbances at the printing cylinder are detected via the actuating drive, reducing the printing speed of the rotary printing press.

3 . The method according to claim 1 , wherein the actuating drive is a rotary drive with a servomotor.

4 . The method according to claim 3 , which comprises detecting the disturbances at a transducer of the servomotor.

5 . The method according to claim 4 , wherein the transducer is an encoder providing output signals.

6 . The method according to claim 5 , which comprises examining the output signals of the encoder for vibration.

7 . The method according to claim 1 , wherein the actuating drive is an actuating drive of a device for controlling a position of the printing cylinder.

8 . The method according to claim 1 , wherein the actuating drive is an actuating drive of a device for controlling a contact pressure between the printing cylinder and an impression cylinder.

9 . The method according to claim 1 , which comprises detecting further disturbances that are dependent on the printing speed of the rotary printing machine at an actuating drive of at least one further rotating cylinder and reducing the disturbances and the further disturbances by changing the printing speed of the rotary printing machine.

10 . The method according to claim 9 , which comprises decreasing or increasing the printing speed of the rotary printing machine until the disturbance and the further disturbance are reduced to below a predefined maximum disturbance threshold.

11 . The method according to claim 1 , wherein the disturbances are dependent on a print image on a printing forme at the printing cylinder.

Assignees

• Heidelberger Druckmasch Ag

Inventors

• Putzer Marcus
• Schadl Hans

Classifications

• B41F31/307

  Sliding bearings · CPC title

• B41F33/00 Primary

  Indicating, counting, warning, control or safety devices (arrangements of counting devices in platen presses B41F1/00 {, B41F1/58; arrangements of counting devices} in cylinder presses B41F3/84; ink supply or metering devices B41F31/02) · CPC title

• B41F5/04

  for printing on webs · CPC title

• B41F13/085 Primary

  with means for preventing or damping vibrations or shocks · CPC title

• B41F5/24 Primary

  for flexographic printing · CPC title