Data processing: measuring – calibrating – or testing – Measurement system – Measured signal processing
Reexamination Certificate
2002-03-26
2004-10-05
Hoff, Marc S. (Department: 2857)
Data processing: measuring, calibrating, or testing
Measurement system
Measured signal processing
C706S003000, C700S128000
Reexamination Certificate
active
06801879
ABSTRACT:
BACKGROUND OF THE INVENTION
FIELD OF THE INVENTION
The invention relates to a method of monitoring processes, in particular the printing process, in a web-processing printing machine. The invention relates in particular to a method according to which process variables are identified in a process space as operating values, which include at least the web tension and the web speed, a measurement of actual values of the operating values is carried out, a presetting or a measurement of actual values of at least one operating parameter that influences these operating values is performed and operating values are assessed as a function of the operating parameters.
It is generally known to measure individual process variables in a printing machine and also to evaluate them as a function of the process state. In the set of individual process variables for the case of a web-processing printing machine, particular significance is attached to the operating values of web tension and web speed. One source of risk for the nonproductivity of a printing machine for a printing material web is, in particular, a web break, which can frequently be attributed to an inappropriate web tension and/or web speed. The risk of the occurrence of such a situation is often only poorly known or can only be poorly estimated. Known monitoring devices for printing machines from time to time permit subsequent analysis of a problem situation but not its avoidance through the use of a prewarning or prediction of inappropriate operating values in the process space of the process variables.
An appropriate and user-friendly visualization of process states of a technical plant is often difficult, because of a multidimensional interdependence and is associated with a large computational outlay. For example, in Published European Patent Application No. EP 0 829 809 A1, a method for the multidimensional display of process states of a technical plant is disclosed, being suitable in particular for the display of process states in a power station plant. In order to permit simultaneous and coherent assessment and display of relevant process variables of the plant, it is proposed to evaluate the relevant process variables in a relationship with one another through the use of a neural analysis on the basis of self-organizing maps by a topology-maintaining, nonlinear projection of data of the relevant process variables onto a multidimensional neural map being implemented. Through the use of dynamic visualization of win rates of individual neurons, a projection of the physical plant states onto a developed map is carried out, so that through the use of a neural “winner takes all” algorithm, the current winner neuron is determined and the summed winner rates of the individual neurons on the map can be displayed in encoded form. Through the use of the method described, each plant state which is determined by a plurality of independent process variables can be represented through the use of a projection onto only two or three dimensions, so that improved clarity relating to the actual process states is achieved. Therefore, according to the invention, a projection is carried out onto nonlinear surfaces, so-called main manifolds, which are covered by the topology-maintaining maps in the state space.
The disadvantage when applying such a method to the display of process states of a printing machine for a printing material web is, in particular, the high computational outlay. Furthermore, the process space can be broken down into operating values, to which an actual value and a desired value can be assigned, and operating parameters that influence these operating values. In other words: in the case of the process space of a printing machine for a printing material web, there are low-dimensional, typically two- or three-dimensional hypersurfaces or hyperplanes in the process space whose position is determined by a specific combination of operating parameters. This fact simplifies the procedures in the process space considerably.
SUMMARY OF THE INVENTION
It is accordingly an object of the invention to provide a method of monitoring processes, in particular a printing process, of a web-processing printing machine and an associated apparatus for implementing the method, which overcome the above-mentioned disadvantages of the heretofore-known methods and devices of this general type and which allow the machine operator to make a simple analysis of the actual values of specific operating values and helps avoid operating the machine in a region of critical operating values and operating parameters.
With the foregoing and other objects in view there is provided, in accordance with the invention, a method for monitoring processes of a web-processing printing machine, the method includes the steps of:
identifying process variables in a process space as operating values including at least a web tension and a web speed;
carrying out a measurement of actual values of the operating values;
presetting and/or measuring actual values of at least one operating parameter that influences the operating values;
assessing the operating values in dependence on the at least one operating parameter; and
generating a map of the process space by allocating at least a subset of points of the process space to at least two classes representing a measure of a risk of an operating state of the web-processing printing machine.
In other words, the method according to the invention of monitoring processes, in particular the printing process, in a web-processing printing machine, process variables being identified in a process space as operating values, which include at least the web tension and the web speed, a measurement of actual values of the operating values being carried out, a predefinition or a measurement of actual values of at least one operating parameter that influences these operating values being performed and operating values being assessed as a function of the operating parameters, is distinguished by the fact that a map of the process space is generated, an allocation of at least one subset of points of the process space to at least two classes being performed, which represents a measure of the risk of the operating state of the printing machine. In other words, it is distinguished by the fact that there is a map of at least one subset of the process space, typically of the subspace of the operating values or a process space of the operating values as a function of the operating parameters, which subjects the possible operating values to a classification with at least two classes. The process space is formed by the value set of all process variables, a subset of the process variables being referred to or identified as operating values if their special significance for the process has been detected or realized. For example, these are process variables which have to be varied actively or monitored by the machine operator during operation, such as typically the web speed and the web tension. An assessment of operating values can be carried out through the use of simple functional relationship using numerical values from a value set. The group of operating parameters in this case includes printing material characteristics, the time since the last web cut, the time since the last rubber blanket cleaning, parameters of the dryer, the rate of printing material defects on the running reel and the like.
In other words, the process space is the set of all possible operating states which are characterized by process variables, so-called operating values and operating parameters, that is to say the set of all possible combinations of operating values and operating parameters. In other words: the process space is covered by the operating values and the operating parameters. Here, the operating values form a process subspace. A hyperplane or hypersurface in the process space, which is covered i.e. defined by at least two process variables from the set of operating values with the operating parameters fixed, is therefore typically an affine subspace of the entire proces
Hoff Marc S.
Kim Paul L
LandOfFree
Method and apparatus for monitoring processes in a... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for monitoring processes in a..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for monitoring processes in a... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3309450