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US 7,787,980 B2Granted
Methods and a device for the regulation of the web tension in a multi-web system
AssigneeKoenig & Bauer Aktiengesellschaft
InventorsHarald Karl Gretsch, Reinhard Georg Groβ
Life of this patent
Estimating the term…
Abstract
The tension of a web in a multi-web system is regulated. At least two webs initially run through a first processing step independently of each other and are subsequently combined with each other to form one resultant web strand. The web tensions of these two initially independent webs are adjusted to each other through a first regulation process. Each of these webs has its web tension regulated on the separate web path by a dedicated second regulation process which is different from the first regulation process.
Claims38
A method for controlling web tensions in a multi-web system including:
- providing at least first and second separate webs;
- passing said first web through a first web processing step and through a following first web traction element;
- providing a first local tension control process for controlling web tension in said first separate web;
- measuring said first web's tension and generating a first web tension measurement value;
- controlling said first web's tension using said first local tension control process to generate a first local tension control value;
- passing said second web through a second web processing step and through a following second web traction element;
- providing a second local tension control process for controlling a web tension in said second web;
- measuring said second web's tension and generating a second web tension measurement value;
- controlling said second web's tension using said second local tension control process to generate a second local tension control value;
- combining said at least first and second separate webs into a web strand, said first and second local tension control processes controlling said web tension in each of said at least first and second separate webs prior to combining said at least first and second webs into said web strand;
- providing a global tension control process for controlling relative web tension between said first and second separate webs, said global tension control process being responsive to said first web tension measurement value and to said second web tension measurement value;
- generating, in said global tension control process, at least one desired tension value for one of said first web's tension and said second web's tension;
- out-putting, from said global tension control process, said at least one desired tension value to one of said first and second local control processes in response to the measured web tension in one of said first and second separate webs deviating from a selected tension level;
- and
- controlling individual web tensions in said at least first and second separate webs using at least one of said at least first and second web traction elements.
12 more elements
A device for the control of web tensions in a multi-web system comprising:
- at least first and second webs;
- a first web processing stage and a first web traction element located after, in a direction of web travel, of said first web processing stage;
- a second web processing stage and a second web traction element located after, in a direction of web travel of said second web, said second web processing stage;
- means combining said first and second webs into a web strand after, in said directions of web travel, said first and second web process steps;
- and
- a web tension control system usable for setting web tensions in said first and second webs, said web tension control system including a global control device and at least first and second local control devices, each of said at least first and second local control devices being adapted to perform a control function directed to a respective one of said at least first and second webs by use of a measured value of a web tension of a selected one of said first and second webs, said global control device being adapted to perform a control task directed to all of said webs combined into said web strand, said global control device being adapted to generate a value for said at least first and second local control devices on the basis of measured valued of said web tensions brought together.
3 more elements
Dependencies are inferred from the claim text.