US 8,931,411 B2Granted

Method for regulating a web tension in a processing machine

AssigneeRobert Bosch GmbH

InventorsHolger Schnabel, Stephan Schultze, Mario Goeb

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Abstract

A method for regulating a web tension in a processing machine for processing a product web, in particular a shaftless printing press, includes separating a first product-web section from a second product-web section by a delay section. The web tensions in the first and second product-web sections are influenced by first and second actuators, respectively. To regulate the web tension in the first product-web section, the method further includes defining a regulation output value from which an actuating command for the first actuator is derived. An actuating command for the second actuator is defined from the regulation output value and a delay element to decouple the web tension in the second product-web section from the regulation of the web tension in the first product-web section. The delay element delays the effect of the regulation output value on the actuating command for the second actuator by a delay time.

Claims11

Dependent claims

A method for regulating a web tension in a processing machine for processing a product web, comprising:

separating a first product-web section from a second product-web section by a delay section, which includes at least one roll, at least 25% of which is wrapped around by the product web:
influencing a first web tension in the first product-web section by a first actuator and influencing a second web tension in the second product-web section by a second actuator;
defining a regulation output value to regulate the first web tension in the first product-web section;
deriving a first actuating command for the first actuator from the regulation output value;
deriving a delay element corresponding to a delay time defined as a quotient of a length of the delay section and a speed of the product web in the delay section;
deriving a second actuating command for the second actuator from the regulation output value and the delay element to delay an effect of the regulation output value on the second actuating command for the second actuator by the delay time in such a way that the second web tension in the second product-web section is decoupled from the influencing of the first web tension in the first product-web section;
and
driving the second actuator based on the second actuating command.

5 more elements

Dependencies are inferred from the claim text.