JPH0557879A - Operation control device of offset press - Google Patents

Abstract

PURPOSE:To accurately control the amount of damping water in an offset press. CONSTITUTION:The disturbance of an offset press 11 is collected by a data collecting part 17. Data satisfying the collected data according to conditions is extracted by a fuzzy cluster 18 to be stored in a fuzzy clustered data part 19. A rule function and a membership function are respectively formed in a rule generator 20 and a membership generator 21 on the basis of the stored data to be stored in memories 22, 23. The data stored in the memories 22, 23 and the disturbance after the start of the operation of the offset press are inferred by a fuzzy inference mechanism part 24. The offset press 11 is controlled on the basis of this inferred value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation control device for an offset printing machine which controls the amount of dampening water in the offset printing machine.

[0002]

2. Description of the Related Art As is well known, offset printing is a printing method utilizing the chemical action of water and oil (ink). In this printing method, the image area is oleophilic, and the ink adheres to the non-image area. Is processed to be hydrophilic, and water is deposited there to repel ink to form an image. The obtained image is transferred to paper through a blanket cylinder and printed.

As described above, in offset printing, water is used to form an image, so the supply amount of dampening water affects print quality. These influences include fluctuations in print density, sharpness of printed matter, and gloss. By the way, in order to control the amount of dampening water, an optical method for irradiating the plate surface with light and detecting the reflected light to judge the amount of water on the plate surface, and several kinds of dampening water amount curves that function as machine speed, temperature, etc. In general, it is made and PID feedback control is performed.

[0004]

The above method is used to control the amount of dampening water in an offset printing machine. However, the above method causes disturbance (ink temperature, humidity,
The image quality, paper quality, paper size, printing speed, ink viscosity, etc.) have a great influence, and the final dampening water amount is adjusted by the operator by judging the printed state of the printed matter.
This operator's control of the amount of dampening water always has a subjectively qualitative "ambiguity" of the operator such as "a little more" or "a little less", so it does not become a uniform control curve of water volume. .. Moreover, since the control of the amount of dampening water is a multivariable control, it is difficult to make a mathematical model. Due to such a problem, it was extremely difficult to appropriately control the dampening water amount in the offset printing machine.

The present invention has been made in view of the above circumstances, and since the dampening water amount control in the offset printing machine is fuzzy clustered based on the operation of the operator, the control rule and the membership function are automatically generated. Therefore, it is an object of the present invention to provide an operation control device for an offset printing machine, which is capable of appropriately controlling the amount of water.

[0006]

In order to achieve the above object, the present invention relates to an offset printing machine, and disturbances such as ink temperature, humidity, ink viscosity, etc., which are operation variables of the offset printing machine, and a dampening water amount. A fuzzy control rule and membership function learning unit that automatically inputs fuzzy control rules and membership functions from them, and a fuzzy control rule and membership function generated by this learning unit and the offset printing machine are input. It is provided with a fuzzy inference mechanism section which is supplied with the disturbance generated when the operation is performed and fuzzy infers both of them to output an output for controlling the water roll speed of the offset printing machine.

Further, the learning section includes a data collecting section for collecting data of manipulated variables related to disturbance and water volume, and a fuzzy cluster for taking out data satisfying conditions such as printing conditions from the data collected by the data collecting section, It consists of a fuzzy clustered data part that stores the data extracted by this fuzzy cluster, and a rule generator and membership function generator that automatically generate fuzzy control rules and membership functions using the data in this data part. ..

[0008]

The control section for the disturbance of the offset printing machine and the dampening water amount and the membership function are generated in advance by the learning section. And when the operation of the offset printing machine is started,
The control rules and membership functions generated by the learning unit and the actual disturbance are input to the fuzzy inference mechanism unit for fuzzy inference. This fuzzy inference output controls the operation of the offset printing machine.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a system configuration diagram showing an embodiment of the present invention. In FIG. 1, 11 is an offset printing machine, and the offset printing machine 11 has a dampening water regulator 1 for an operator.
2 are connected via a changeover switch 13. The offset printing machine 11 includes an inverter 11a and an induction motor 11
b and a water roller 11c are provided. The disturbance of the offset printing machine 11 is changed through the changeover switch 14 to the fuzzy dampening water amount control device 15 with a learning function and the data collecting unit 1 of the membership function learning unit 16.
Input to 7. The output of the dampening water regulator 12 for the operator is also input to the data collecting unit 17.

From the data collected by the data collection unit 17, data satisfying the conditions such as the printed state is taken out by the fuzzy cluster 18 and the fuzzy clustered data unit 1
9 is stored. The data stored in the data section 19 serves as a basis for creating control rules and membership functions. The data of the fuzzy clustered data unit 19 is supplied to a rule generator 20 and a membership function generator 21 that automatically generate control rules and membership functions.

The rules and membership functions automatically generated by the rule generator 20 and the membership function generator 21 are stored in the memories 22 and 2, respectively.
3 is stored. Reference numeral 24 is a fuzzy inference mechanism section. The control rules and membership functions of the memories 22 and 23 and the disturbance of the offset printing machine 11 are input to the mechanism section 24. The fuzzy inference mechanism section 24 fuzzy infers the inputted rule function and the disturbance value and gives the output to the offset printing machine 11 for control.

The changeover switch 13 switches between the manual mode M and the automatic operation mode A, and the changeover switch 14 switches between the learning mode Lg and the automatic operation mode A.

Next, the operation of the above embodiment will be described. Disturbances and operator operating variables are ink temperature T, humidity H, ink viscosity S, printing speed V, image area A, paper quality P,
Assuming that the paper size is L and the operation amount is U, when the changeover switch 14 is in the learning mode Lg, the above-mentioned variables (T to U) are stored in the data collection unit 17. The data of the data collection unit 17 is supplied to the fuzzy cluster 18, where a combination of data satisfying the conditions (Ti,
Hi, Si, Vi, Ai, Pi, Li, Ui) are extracted by the fuzzy cluster 18 and stored in the fuzzy clustered data unit 19. However, i = 1 to n.

The control rule generator 20 uses the data stored in the fuzzy clustered data section 19.
Generate with. For example, a variable (T to U) is changed to an input variable (T to
L) and the output variable (U) are divided, and a rule is generated as in the following equation.

[0015]

[Equation 1]

Next, the generation of the membership function will be described. Tk (k = 1-n) is obtained by arranging the data Ti (i = 1-n) of the variable T stored in the fuzzy clustered data section 19 in ascending order. j), the fuzzy label

[0017]

[Equation 2]

Membership function for μTk (k =
1 to j) are determined as shown in FIG.

If the rules and membership functions are determined as described above and they are input to the memories 22 and 23, then the changeover switches 13 and 14 are switched to the automatic operation mode A, respectively, to operate the offset printing machine 11. Start. The input value of the disturbance is input from the offset printing machine 11 to the fuzzy inference mechanism section 24, and the operation amount U is obtained by the fuzzy inference mechanism section 24. The operation amount obtained by the mechanical unit 24 is supplied to the inverter 11a of the offset printing machine 11. The inverter 11a is controlled by this to control the speed of the induction motor 11b to perform ideal offset printing.

[0020]

As described above, according to the present invention,
Control rules and membership functions are automatically generated to perform fuzzy clustering based on the operations of skilled operators, which enables accurate control of water volume in offset printing, resulting in extremely good print results. it can. In addition, all measurable data can be taken into the fuzzy control, and the number of rules can be reduced because all the fuzzy labels of the input variables are not matrix rules. Furthermore, because it uses fuzzy inference, it is possible to flexibly deal with the non-linear effects of disturbances, and even if the installation location is changed, it can be used immediately after learning once. Is obtained.

[Brief description of drawings]

FIG. 1 is a system configuration diagram showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a membership function.

[Explanation of symbols]

11 ... Offset printing machine, 12 ... Damping water regulator for operator, 13, 14 ... Changeover switch, 15 ... Fuzzy dampening water amount control device with learning function, 16 ... Fuzzy rule and membership function learning unit, 17 ... Data collection Part, 18
... fuzzy cluster, 19 ... fuzzy clustered data section, 20 ... rule generator, 21 ... membership function generator, 22, 23 ... memory, 24 ... fuzzy inference mechanism section.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tadashi Ichigo Kazuma 2-1-117 Osaki, Shinagawa-ku, Tokyo Stock company inside Meidensha (72) Inventor Shingo Suzuki 2-1-17-1 Osaki, Shinagawa-ku, Tokyo Stocks Inside the company Meidensha (72) Inventor Masayoshi Kawamura 2-1-1 Osaki, Shinagawa-ku, Tokyo Stock company Inside Meidensha

Claims (2)

[Claims] 1. An offset printing press and an operation amount relating to the amount of dampening water or disturbance such as ink temperature, humidity, ink viscosity, etc., which are operation variables of the offset printing press, are inputted, and a fuzzy control rule and a membership function are inputted from these. A fuzzy control rule and membership function learning unit that is automatically generated, the fuzzy control rule and membership function generated by this learning unit, and the disturbance that occurs when the offset printing machine is operated are supplied, and both are fuzzy. An operation control device for an offset printing press, comprising: a fuzzy inference mechanism section that infers and outputs an output for controlling the offset printing press. 2. The data learning unit, wherein the learning unit collects data of manipulated variables related to disturbance and water volume, and a fuzzy cluster that extracts data satisfying conditions such as printing conditions from the data collected by the data collection unit, It consists of a fuzzy clustered data part that stores the data extracted by this fuzzy cluster, and a rule generator and membership function generator that automatically generate fuzzy control rules and membership functions using the data in this data part. The operation control device for an offset printing machine according to claim 1.