Back to results
US 6,647,874 B1Granted
Good register coordination of printing cylinders in a web-fed rotary printing press
AssigneeMaschinenfabrik Wifag
InventorsWalter Siegl, Andreas Helfenstein
Life of this patent
Estimating the term…
Abstract
The present invention pertains to the register coordination of cylinders of a web-fed rotary printing press which print on a web, wherein a first cylinder printing on one side of the web is driven by a first motor and a second cylinder printing on the same side of the web is driven by a second motor. An angular position of the second cylinder is coordinated with the first cylinder in good register by a controller. In the case of a change in a production condition, at least one controller parameter (kP, kD, kI, kf) of the controller is changed and the controller setting is adapted to the production condition as a result.
Claims30
A process for register coordinating cylinders of a web-fed rotary printing press, the process comprising the steps of:
- providing a web;
- printing on one side of said web with a first cylinder print group;
- driving said first cylinder print group with a first motor;
- printing on said one side of said web with a second cylinder print group;
- driving said second cylinder print group with a second motor;
- sensing a registry of said first and second cylinder print groups and generating a registration signal;
- providing a controller for coordinating an angular position of said second cylinder print group in register with said fist cylinder print group according to one of a plurality of control characteristics, said controller receiving said registration signal and actuating one of said motors;
- changing a production condition from a first production condition to a second production condition;
- detecting said second production condition;
- changing said one of said control characteristics to another said control characteristic based on said second production condition;
- said control characteristics including a controller parameter based on one of a production-specific parameter basic value kP Basis, kD Basis, kI Basis, and kf Basis where said controller is a PID controller.
8 more elements
A device for coordinating registration of cylinders of a web-fed rotary printing press which print on a web, the device comprising:
- a first cylinder print group printing on one side of the web;
- a first motor driving said first cylinder print group;
- a second cylinder print group printing on said one side of the web;
- a second motor driving said second cylinder print group;
- a controller for coordinating in good register said second cylinder print group with said first cylinder print group, said controller including one of controller parameters kP, kD, kI, and kf which is changed during a change in a production condition of the press.
2 more elements
A process for register coordinating cylinders of a web-fed rotary printing press, the process comprising the steps of:
- providing a web;
- printing on one side of said web with a first cylinder print group;
- driving said first cylinder print group with a first motor;
- printing on said one side of said web with a second cylinder print group;
- driving said second cylinder print group with a second motor;
- sensing a registry of said first and second cylinder print groups and generating a registration signal;
- providing a controller for coordinating an angular position of said second cylinder print group in register with said first cylinder print group according to one of a plurality of control characteristics, said controller receiving said registration signal and actuating one of said motors;
- changing a production condition from a first production condition to a second production condition;
- detecting said second production condition;
- changing said one of said control characteristics to another said control characteristic based on said second production condition;
- said controller includes one of controller parameters kP, kD, kI, and kf, said controller parameters (kP, kD, kI, kf) of said controller are changed in an adapted manner.
8 more elements
A process for register coordinating cylinders of a web-fed rotary printing press, the process comprising the steps of:
- providing a web;
- printing on one side of said web with a first cylinder print group;
- driving said first cylinder print group with a first motor;
- printing on said one side of said web with a second cylinder print group;
- driving said second cylinder print group with a second motor;
- sensing a registry of said first and second cylinder print groups and generating a registration signal;
- providing a controller for coordinating an angular position of said second cylinder print group in register with said first cylinder print group according to one of a plurality of control characteristics, said controller receiving said registration signal and actuating one of said motors;
- changing a production condition from a first production condition to a second production condition;
- detecting said second production condition;
- changing said one of said control characteristics to another said control characteristic based on said second production condition;
- a disturbance variable (v2) is sent to an output variable (du2.R) of said controller for said second cylinder print group to compensate a reproducible register deviation (Y12) of said second cylinder print group in relation to said first cylinder print group, said deviation being typical of a phase of press operation and foreseeable.
8 more elements
A process for register coordinating cylinders of a web-fed rotary printing press, the process comprising the steps of:
- providing a web;
- printing on one side of said web with a first cylinder print group;
- driving said first cylinder print group with a first motor;
- printing on said one side of said web with a second cylinder print group;
- driving said second cylinder print group with a second motor;
- sensing a registry of said first and second cylinder print groups and generating a registration signal;
- providing a controller for coordinating an angular position of said second cylinder print group in register with said first cylinder print group according to one of a plurality of control characteristics, said controller receiving said registration signal and actuating one of said motors;
- changing a production condition from a first production condition to a second production condition;
- detecting said second production condition;
- changing said one of said control characteristics to another said control characteristic based on said second production condition;
- said second motor includes a motor controller;
- a disturbance variable (v2) is sent to said motor controller of said second motor to form a command variable (u2.Soll) for synchronous running of said first and second cylinder print groups to compensate for a reproducible register deviation (Y12) of said second cylinder print group from the said first cylinder print group, said register deviation (Y12) being typical of a particular phase and foreseeable.
9 more elements
A process for register coordinating cylinders of a web-fed rotary printing press, the process comprising the steps of:
- providing a web;
- printing on one side of said web with a first cylinder print group;
- driving said first cylinder print group with a first motor;
- printing on said one side of said web with a second cylinder print group;
- driving said second cylinder print group with a second motor;
- sensing a registry of said first and second cylinder print groups and generating a registration signal;
- providing a controller for coordinating an angular position of said second cylinder print group in register with said first cylinder print group according to one of a plurality of control characteristics, said controller receiving said registration signal and actuating one of said motors;
- changing a production condition from a first production condition to a second production condition;
- detecting said second production condition;
- changing said one of said control characteristics to another said control characteristic based on said second production condition;
- values determined from a measurement or a simulation of a phase of acceleration or deceleration for register deviations (Y12) of said second cylinder print group at different circumferential velocities (v2) of said second cylinder print group are stored in a digital memory of one of a control member and a higher control means.
8 more elements
A process for register coordinating cylinders of a web-fed rotary printing press, the process comprising the steps of:
- providing a web;
- printing on one side of said web with a first cylinder print group;
- driving said first cylinder print group with a first motor;
- printing on said one side of said web with a second cylinder print group;
- driving said second cylinder print group with a second motor;
- sensing a registry of said first and second cylinder print groups and generating a registration signal;
- providing a controller for coordinating an angular position of said second cylinder print group in register with said first cylinder print group according to one of a plurality of control characteristics, said controller receiving said registration signal and actuating one of said motors;
- changing a production condition from a first production condition to a second production condition;
- detecting said second production condition;
- changing said one of said control characteristics to another said control characteristic based on said second production condition;
- a third cylinder print group printing on said one side of the web is uncoupled from a correction of a register deviation (Y12) of said second cylinder print group, said correction being performed for said second cylinder print group by sending a variable (du2.R) for said second cylinder print group to an uncoupling member EG234 and by mixing an output signal (E234) of said uncoupling member with a setting variable (du3,R) for correcting register deviations (Y13) of said third cylinder print group, said variable bringing about said correction of said register deviation (Y12) of said second cylinder print group.
8 more elements
Dependencies are inferred from the claim text.