Method of regulating a web tension

Details Method of regulating a web tension Method of regulating a web tension

1998-01-09

2001-04-03

Coles, Edward (Department: 2622)

Facsimile and static presentation processing

Static presentation processing

Plural marking means

C358S001120, C399S165000, C399S278000

Reexamination Certificate

active

06211968

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a method for regulating a web tension of webs in a web-fed rotary printing press.
DESCRIPTION OF THE PRIOR ART
The regulation of the web tension of webs in a web-fed rotary printing press is a complex procedure. A multitude of variables, in particular a multitude of not exactly quantifiable variables, are all a part of this web tension regulation procedure, and must all be linked with each other while taking them into consideration. This linkage is typically the job of an operator and depends on his experience.
It is disadvantageous that the quality of the regulation of the web tension which can be achieved in this way is a function of the subjective judgements and experiences of the operator, and is very difficult to reproduce.
WO-A-86/01155 discloses a method for the regulation of the web tension of webs in a web-fed rotary printing press. In this case a value of the web tension of each web involved is detected as the input quality for regulation.
JP-A-2 043 159 describes a funnel inlet roller with several webs. The web tension of these webs is fixed in such a way that the web tension of the lowermost web is the greatest.
JP-A-3 180 205 describes a regulation of a web tension by means of fuzzy regulation.
SUMMARY OF THE INVENTION
It is the object of the invention to create a method for regulating the web tension of webs web-fed rotary printing press.
This object is attained in accordance with the invention by detecting a value for the tension of each web in the web-fed rotary printing press. Various other input quantities, such as those describing the state of the press, or method-related input quantities are also detected and are processed. These input quantities are quantitatively characterized by linguistic rules and are described by association functions. True values are formed from these association functions. So-called fuzzy logic rules are formulated and are linked together to process these true values. The association values formed on the basis of fuzzy logic rules are backformed into defined numerical values for the generation of discrete manipulated variables for affecting the tension of the web. In a web-fed press which utilizes a funnel-inlet roller, the web tension of the lowermost web is the greatest and the web tension of the uppermost web is the least. The tension of each web is initially performed by one draw-in unit.
The advantages which can be attained by means of the present invention reside in particular in that the operation of web-fed rotary printing presses is made simpler, and no highly qualified, experienced operators are required. The danger of web tearing is reduced, and the web tension is optimized by the regulation of the present invention, which to a large extent, is independent of people. This leads to higher print quality and to increased productivity. Next to exact adjustment values, for example minimal and maximal web tension, it is also possible to process vague statements, for example in relation to the material, such as the paper quality, rubber blanket projection, dampening water guidance, by means of which it is possible to more exactly model the regulated behavior of the web-fed rotary printing press. It is then possible to employ sensors of lesser resolution or with discrete output areas. It is possible to process large amounts of data in a short time by means of the method in accordance with the present invention.


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