JPH01203150A - Web position control device - Google Patents

Abstract

PURPOSE:To control the position of a web with high accuracy and good responsiveness by selecting either feedback control or prediction control in accordance with the conditions of the web and a rotary press, and determining the control quantity from the deviation of the web. CONSTITUTION:The width directional position of the edge of a web W being fed to a rotary press along guide rollers 32 is measured by a measuring sensor head 31. In a control unit 36 into which the above measured signal is input, when a paper feeding signal, a winding diameter signal, and a tension variation signal from the feeding part of the press are input, there is the possibility that the control method is subjected to a change before the deviation from the reference position of the web W is not sufficiently controlled, so that prediction control is selected, while at the time of the other ordinary operating condition feedback control is selected. And, the control quantity is obtained through the deviation from the reference position of the web W, and the positions of guide rollers 32 are controlled via a driving circuit 35 and a pulse motor 34. Thus, the width directional position of the web can be controlled with high accuracy and good responsiveness.

Description

[Detailed Description of the Invention] U Industrial Field of Application The present invention relates to a web (web) running in a rotary printing press.
The present invention relates to a web position control device used in a web guide device that controls the position in the width direction of a web.

[Prior Art] Usually, in a rotary printing press (hereinafter simply referred to as a printing press),
A web guide device is provided in the web travel path between the paper feed section and the printing section to control the position of the web in the width direction to be constant so that the pattern is always printed at a constant position on the web. In addition, a web guide device is installed just before the folding machine so that when the web is fed to the folding machine after printing in the printing section, the relative positional relationship between the folds or slits and the pattern is constant. It is equipped.

Causes of web misalignment in the width direction include tension fluctuations, paper quality variations, printing speed changes, and winding splice changes. The web guide device maintains the edge position of the measuring end of the web and the reference position of the web, that is, the position where the pattern is printed at a certain position on the web, or the relative positional relationship between the fold or slit and the pattern. In order to match these positions, the take-up shaft of the paper feed section is moved in the axial direction or the guide rollers in the web travel path are oscillated according to feedback control or other automatic control methods.

Conventional web guide devices have somewhat loose or ambiguous constraints on the printing position of the design on the web or the relative position of the fold or slit part and the design.
To control the position of the web in the width direction, the runout width is ±1
It was sufficient to satisfy the ability within +n+++. However, depending on the printing item, there are stricter constraints, and as rotary printing presses become more automated and labor-saving, more precise position control in the width direction of the web is required.

[Problems to be Solved by the Invention] Several control methods have been adopted in conventional web position control devices. For example, a feedback control method or a plan as seen in ``Japanese Patent Application No. 112096/1982'' and Japanese Patent Application No. 112149/1983''
This is a new control method such as a llll-like control method.

However, although the feedback control method is effective when the web position variation is small, it is impossible to perform highly accurate control when the web position variation is large. Furthermore, new control methods such as predictive control methods require time to obtain control amounts when complex processing is performed, resulting in poor responsiveness. Therefore, there is a strong demand for a control device that can perform stable, accurate, and responsive web position control no matter what state the web or printing press is in.

The present invention was made to solve the above-mentioned problems, and it is possible to always maintain a stable web position at a high angle of 1 degree and with good responsiveness, even under conditions such as the web or printing machine. It is an object of the present invention to provide a web position control device that can control the web position.

[Means for Solving the Problems] In order to achieve the above object 1), the present invention provides a web position control device that controls the position of a running web in the width direction in a rotary printing press. edge position determining means for measuring the position of the web at regular time intervals, and whether a signal indicating that a condition affecting the fluctuation of the edge position of the web is being output from the rotary printing press or its peripheral equipment. A detection means for detecting the edge position, and a control method for selecting either feedback control or predictive control as appropriate depending on the detection result by the detection means, and for determining the web reference position and the web reference position from the edge position information obtained from the edge position measurement means. calculation control means for determining the amount of deviation of the web and determining a control amount according to a control method selected based on the amount of deviation; and a drive means for moving the position of the web in the width direction based on the control amount from the calculation control means. It is configured by dividing f1ii+.

[Operation] Therefore, in the web position control device of the present invention, the optimal control method of either feedback control or predictive control is selected depending on the state of the web and the rotary printing press, and the web base is controlled according to this control method. By moving the web in the width direction by determining the control amount from the amount of deviation from the ramie position, it becomes possible to control the position of the web in the width direction with high precision and good responsiveness.

[Embodiment] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 2 is a perspective view showing a configuration example of a web guide device including a web position control device according to the present invention. In FIG. 2, the web W is fed from the paper feed side of the printing machine through each guide roller, passes through a guide roller 32, and is introduced into a measurement sensor head 31, which is an edge position measurement means.

The guide roller 32 is connected to a pulse motor 34 via a rotational drive shaft 33. Further, this pulse motor 34 is driven based on a pulse signal from a drive circuit 35. Furthermore, the control box 36 is configured to /+111 f
Position signal (position information) extracted from the sensor head 31
and No. 1.5 indicating the rJ=#-i state of the web W extracted from the printing press, calculation processing is performed to obtain the web position correction amount, which is a control amount.

FIG. 1 is a block diagram showing a configuration example of a web position control device according to the present invention. In FIG. 1, reference numeral 1 indicates a webtonite device, and reference numeral 2 indicates a printing machine. The web guide device 1 is equipped with the above-mentioned measurement sensor head 31, a control section 4 which is an arithmetic control means, and a drive section 5, and the printing machine 2 is equipped with a tension meter and a detector (not shown). It is being

Here, a signal indicating the running state of the web W is taken in from the printing machine to the control unit 4, and a constant sensor is sent to the controller 4.
The position signal X of the edge portion of the web W is always inputted to the control unit 4 from '31. On the other hand, the control unit 4 controls the web W
Depending on the signal indicating the running state of the vehicle, one of the control methods, feedback control or predictive control, is selected as appropriate;
In addition, the amount of deviation from the web reference position is determined from the position signal X of the edge portion of the web W obtained from the measurement sensor spatula +:31, and based on this amount of deviation, the control amount ( web position correction amount),
This is sent as a drive signal Y to the drive unit 5.

In this embodiment, as a signal indicating the running state of the web W,
A paper splicing signal P and winding diameter transmission are input from the paper feed section of the printing machine 2, and a number T is input as tension fluctuation from a tension meter.

Here, the paper splicing signal P is output from a detector (not shown) that detects passage of the paper splicing portion each time the paper splices pass. Further, the winding diameter signal is output when the diameter becomes smaller than a certain constant value using, for example, a length measuring method using a phototube. Further, the tension fluctuation signal T is outputted from the tension meter when the tension fluctuation of the web W exceeds a certain specified amount.

Next, the operation of the web position control device configured as described below will be explained using the flow diagram shown in FIG.

First, the control unit 4 determines the reference position of the web W in step s1. Here, the reference position of the web W can be determined by manually inputting it by the operator of the printing press 2, or by taking in the edge position signal X of the web W from the measurement sensor head 31 for a certain period of time and calculating the average value. How to calculate or all constant sensor send 3
For example, a method is used in which an edge position signal X of the web W is taken in from 1 to 1 and the edge position at a certain moment is used as a reference position.

Next, after determining the reference position of the web W in this manner, the presence or absence of a signal indicating the running state of the web W from the printing press 2 is determined in the next step. (Here, the signal indicating the running state of the web W needs to have a certain length in order to ensure sufficient web W position ib! control time. This is because if the signal is short, (This is because there is a risk that the control method may change while the amount of deviation from the web reference position is not sufficiently controlled.) In other words, first, step S
2, the presence or absence of the paper splicing signal P from the paper feed section of the printing press 2 is determined, and if the paper splicing signal P is output, the r measurement control method is unconditionally selected and the process proceeds to the next step S6. , if the paper splicing signal P is not output, the process moves to step S3. In step S3, it is determined whether there is a take-up diameter signal from the paper feed section of the printing press 2, and if the take-up diameter signal is output, the predictive control method is unconditionally selected and the next step S6 is performed. The process moves to step S4, and if only the winding diameter signal is output, the process moves to step S4. In step S4, the tension fluctuation signal T from the tension meter of the printing press 2 is
If the tension fluctuation signal T is output, the predictive control method is selected and the process moves to the next step S6, and if the tension fluctuation signal T is not output, the feedback control method is selected and the next step is performed. The process moves to step S5.

As a result of determining the presence or absence of a signal indicating the running state of the web W as described above, if the pre/l1ll control method is selected, the measurement sensor head 3 is activated in step S6.
1, the position signal X of the web W is input, and in step S8, the difference from the above-mentioned web reference position is determined as the amount of deviation, and based on this amount of deviation, the control amount is calculated according to the predictive control method. On the other hand, if the feedback control method is selected as a result of the determination of the presence or absence of a signal indicating the running state of the web W, the position signal X of the web W is manually input from the measurement sensor head 31 in step S5, and the above-mentioned The difference from the web reference position is determined as the amount of deviation, and based on this amount of deviation, the control amount is calculated according to the feedback control method.

Thereafter, in step S9, the control amount calculated in step S8 or step S7 is transferred to the drive unit 5, and the process returns to step S2 to repeat the control process as described above, thereby controlling the width direction of the web W. Position control is performed.

As described above, when there is a signal indicating that the running web W is subjected to sudden force among the signals P, L, and T indicating the running state of the web W from the printing machine 2, that is, in this case For example, if there is a decrease in the diameter of one roll of paper splicing or a large change in tension, the amount of deviation of the edge position of the web W from the reference position will increase. Therefore, in such a case, a predictive control method is used to control the position of the edge portion of the web W with high precision. On the other hand, signals P and L indicating the running state of the web W from the printing machine 2.

If there is no signal in T indicating that the running web W is subjected to a sudden force, the amount of deviation of the edge position of the web W from the reference position is small. Therefore, in such a case, a normal feedback control method is used to control the position of the edge portion of the web W, which has high responsiveness.

Note that the feedback control method referred to here is based on position information (position signal) This is a method of controlling the position of the running web W in the width direction using the amount of deviation as a control amount (web position correction amount). Also, what is the predictive control method?
Continuous from among the position information (position No. 15) X of the web W taken in from the measurement sensor head 31. Or - location information Xn-3, Xn-2 extracted at fixed time intervals.

Differences are made for Xn-1 and Xn respectively, and the edge position displacement direction on the line in the web width direction (is the + direction one direction?)
and the edge position displacement m (Xn -Xn-1) are expressed as displacement vectors Vn-2, Vn-1, and Vn, and several types of displacement vectors Vn-2 and Vn-1 are expressed based on the running information of the web edge measured in advance. ,Vn.

The control amount for correcting the web edge position to the normal position (correction f
f1) At least one prediction table consisting of Co is recorded in advance as shown in FIGS. In this method, a control amount (web position correction amount) is determined by comparison with a combination of detected displacement vectors, and the position of the running web W in the width direction is controlled based on this control amount.

As described above, the web position control device of this embodiment overcomes the low accuracy that only one type of control method has in the conventional web position control devices.

Problems such as poor responsiveness can be resolved by selecting the most suitable control method, either feedback control or predictive control, depending on the conditions of the web W and the printing press 2, resulting in constant stability. This makes it possible to control the web position with high precision and good responsiveness.

In the above embodiment, the signals indicating the running state of the web W include the paper splicing signal P from the paper feed section of the printing machine 2, the winding diameter signal L1, and the low tension signal T from the tension meter.
However, the present invention is not limited to this, and if there is a signal that affects the fluctuation of the edge position of the web W, the control unit 4 may receive the signal.

[Effects of the Invention] As explained above, according to the present invention, the optimum control method of either feedback control or pre-Δ1 control is selected depending on the state of the web and the rotary printing press, and this control method is Accordingly, the control amount is determined from the amount of slippage with the web reference position and the web is moved in the width direction.
It is possible to provide a web position control device that can always stably control the web position with high accuracy and responsiveness even under conditions such as a web or a printing machine.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the web position control device according to the present invention, FIG. 2 is a perspective view showing a web guide device including the web position control device in the same embodiment, and FIG. 3 is a block diagram showing an embodiment of the web position control device according to the present invention. A flowchart for explaining the operation, and FIGS. 4(a) and 4(b) are diagrams showing prediction tables, respectively. 1 Webtonoid device, 2 Printing machine, 3 Measurement sensor head, 4 Control unit, 5 Drive unit. Applicant's agent Patent attorney Takehiko Suzue
Pre-soaked retail A (a)

Claims (1)

[Scope of Claims] A web position control device for controlling the position of a running web in the width direction in a rotary printing press, comprising: edge position measuring means for measuring the position of a web edge in the web width direction at regular time intervals; a detection means for detecting whether or not a signal indicating that a condition affecting a change in the edge position of the web is being outputted from the rotary printing press or its peripheral equipment; to select either feedback control or predictive control as appropriate, determine the amount of deviation from the web reference position from the edge position information obtained from the edge position measuring means, and calculate the amount of deviation from the web reference position based on the amount of deviation. A web comprising: arithmetic control means that determines a control amount according to a selected control method; and a drive means that moves the position of the web in the width direction based on the control amount from the arithmetic control means. Position control device.