JPH01203149A - Web position control device - Google Patents

Abstract

PURPOSE:To maintain quickly a meandering width within an allowable limit by correcting the width directional position of a web on the basis of a first control quantity corresponding to the width directional velocity of the web and a second control quantity corresponding to the position (width directional displacement) information. CONSTITUTION:The width directional displacement of a web (a) running along guide rollers 2, 5a, 5b, and 1 is measured by a measuring sensor head 4 consisting of a CCD line sensor or the like. And, a control unit 10 obtains the width directional position and width directional velocity of the web (a), and on the basis of these values, calculates a first control quantity corresponding to the width directional velocity and a second control quantity corresponding to the deviation in both the width directional position and the target position, and on the basis of these two control values, the positions of guide rollers 5 are controlled via a driving circuit 9, so that the edge of the web (a) can be automatically, quickly and properly positioned in a specified position required for printing. Thus, the width directional variation due to meandering can be always restrained within an allowable limit.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applied to a running web (web) in a rotary printing press.
This invention relates to a web position control device that maintains the edge position in the width direction of the web and the meandering width during running within permissible limits.

[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 traveling path between the paper feed section and the printing section, which controls 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, when the web is fed to the folding machine after printing in the printing section, a web guide device is installed just before the folding machine so that the relative positional relationship between the folding section and the slit section and the pattern is constant. Causes of misalignment in the width direction of the web include tension fluctuations, paper quality variations, printing speed changes, web splicing, and the like.

Conventional web guide devices cannot control the position of the web in the width direction due to constraints on the printed position of the design on the web or the relative position of the fold or slit part and the design.
It was sufficient to satisfy the ability within 1mrr1. However, depending on the printing item, there are stricter restrictions, and printing machines need to be automated.

As labor savings progress, higher precision position control in the width direction of the web is required. Therefore, not only is it necessary to improve the accuracy of the web position detection sensor at the web side edge, but also the web guide device for stable running of the web and the drive control method for this device are required to have precise control capabilities. .

[Problem to be Solved by the Invention] Now, in the conventional web position control device, the edge position of the web is measured intermittently at certain time intervals, and if the edge position of the web deviates from the allowable value, the edge position is adjusted to a predetermined position. A movement correction operation is being performed. Therefore, since the correction operation cycle is relatively long, even if a web edge running position shift occurs during the non-correction time, it will be overlooked. There is a risk that Furthermore, there was no function for stabilizing running by reducing the meandering width that occurs in the running web.

The present invention has been made in order to solve the above-mentioned problems, and it is possible to maintain the edge position in the width direction of the web running in a printing machine within an allowable limit, and to reduce the meandering width that occurs while the web is running. An object of the present invention is to provide a web position control device that can maintain the web position within acceptable limits in a short period of time.

[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 the running web in the width direction in a rotary printing press. web position measuring means for measuring the edge position of the web at regular time intervals, and determining the speed in the width direction of the web from the web position information obtained from the web position measuring means, and different calculation methods depending on the magnitude of the speed. determining a deviation from a target position of web position control from web position information obtained from a first control amount calculating means for determining a first control amount for correcting the position of the web and a web position measuring means; and second control amount calculation means for determining a second control amount for correcting the position of the web from the deviation, and first and second control obtained from the first and second control amount calculation means. web position determining means for determining the amount of actual web position correction based on the amount, and attitude control means for moving the position of the web in the width direction based on the amount of web position correction determined by the web position determining means. ing.

[Operations] Therefore, in the web position control device of the present invention, the first control amount corresponds to the speed in the width direction of the web, and the second control amount corresponds to the web position information (width direction deviation). By correcting the widthwise position of the web in two steps based on the two control variables, it is possible to automatically and quickly properly position the edge of the web at the specified position required for printing. In addition, it is possible to control and stabilize widthwise fluctuations due to meandering during steady running of the web within the permissible limit value, thereby reducing register fluctuations in the pattern printed on the web due to disturbances in web running. can be made significantly smaller.

[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 Figure 2, web a is fed from the paper feed side of the printing press through each guide roller, passes between printing units such as a printing cylinder and impression cylinder, and is discharged to the paper output side where a sheeter or folding machine is located. be done. On the other hand, a web kite device 3 is installed between the guide roller 1.2 between the paper feed side and the printing unit entrance side, or between the tunoid rollers between the printing unit exit side and the paper discharge side. The web a fed from the paper feed side passes through each kite roller 2 on the paper feed side, is introduced into the web tsunoite device 3 installed immediately after the kite roller 2, and then passes through the full + constant sensor hesen'4. . Further, the web guide device 3 is provided with one or a pair of swingable guide rollers 5 facing each other in parallel, and the support shaft 5a of the kite roller 5 is supported by brackets 6 on both sides. 6 is integrally supported by a direction changing rotation drive shaft 7. here,
The rotation center of the direction conversion rotation drive shaft 7 is the above-mentioned rocking 111.
When there is only one kite roller 5, its support shaft 5
If the kite roller 5 is provided in a direction perpendicular to a, and if the kite roller 5 is composed of a pair of rollers, the pair of guide rollers 5 parallel to the car are aligned perpendicularly to the intersection of the diagonals of the opposing quadrilaterals. installed in the direction of passage.

On the other hand, the rotation of the direction conversion rotation drive shaft 7 is designed so that it can be repeatedly rotated within a predetermined rotation angle limit (for example, ±2°) for safety, and is equipped with an encoder as necessary, and is equipped with a helical gear, a worm gear, etc. It is connected to the driving shaft of the pulse motor 8 through the motor. The pulse motor 8 is controlled to rotate forward, stop 7, or rotate reversely depending on the number of pulses generated from a drive circuit 9 such as a pulse generator. Furthermore, the measurement sensor head 4 and the drive circuit 9 are connected to a control box 10 that contains a web position 4(]j constant circuit, a central processing circuit, and a predictive control amount storage circuit'', (J).

FIG. 1 is a block diagram showing an example of the configuration of a web position control device according to the present invention. As shown in FIG. 1, it is comprised of a web position measuring section 11, a central processing section 12, a control amount storage section 3, and an attitude control section 4.

Here, the web position measuring section]1 includes a CCD line sensor 11-1, an A/D converter]]-2, a pulse generator]1-3, a FIFO section]]-4, a comparison section, and a delay Department,
It is composed of a data selector []-5 consisting of a counter and a part of the central processing unit [2], which measures the edge position of the web a in the web width direction at regular time intervals, that is, using a pulse motor, and uses the measured data to Amount of deviation AI from the required setting position target value Ao of the web a
, A2 , -, A'n-1, A'n, A'n+
1. −・− is calculated. As this web position measuring unit 11, for example, a CC
It is possible to use a device that measures the edge position of the web with high precision using a line sensor such as D, or use other single or combination detection sensors and detection signal calculation devices, including but not limited to this. You can also do that.

In addition, the central processing unit 12 calculates the speed in the width direction of the web from the web position information received from the web position measurement unit 11, and calculates the web position using a different calculation method depending on the magnitude of the speed. web position control based on the web position information obtained from the web position measurement unit] A second control variable that determines the deviation from the target position of the web, and determines a second control variable (control variable corresponding to web position information (width direction deviation)) for correcting the web position from the deviation. It has a calculation function and a web position determination function that determines the actual web position correction amount based on the first and second control amounts obtained by the first and second control amount calculation functions.

First of all, the first control amount calculation function is 5t.
Vector mP of movement of web a every a period.

−(A2 Ao), Pl = (A7 A5
), ・−−.

Find P n = (A'5n+2-A5n). Then, the movement of the web a is divided into three stages depending on the magnitude of the vector amount, and if the vector amount is the smallest, the first control amount is applied.If the vector amount is the second, the first control amount is applied. If the amount is αx P n % and the third one is determined, the first controlled amount is determined to be β×Pn. In addition, as the second control amount calculation function, '5t
When A5n≧Xs, that is, exceeds the predetermined F value for each cycle a, the deviation amount Ql-(A5'
Q2= (Ago XS), --, Qn=
Find (A'5n Xs). This Qn is a scalar quantity that has no direction, unlike the above-mentioned Pn.

Then, this deviation amount Q n is multiplied by a coefficient γ to determine the second control amount as γxgn.

Here, α and β are coefficients that are appropriately determined depending on the speed in the width direction of the web and are multiplied by the vector quantity, and are assumed to be within the ranges of 0≦α and β≦1, respectively. Furthermore, γ is a coefficient multiplied by the scalar quantity, and is assumed to be within the range of 0≦γ≦1. The values of these coefficients α, β, and γ are variable,
The optimum value can be selected as appropriate depending on the practical model. The optimal values of these coefficients α, β, and γ can be determined by simulation by calculating the results of adding the control of the present invention to the data of the movement of the web a.

Furthermore, the control amount storage unit 1B stores the above-mentioned coefficients α, β, and γ.
a coefficient storage section 13-1 for storing the above-mentioned first control mPn; a control amount storage section 13-2 for storing the above-mentioned first control mPn;
and a second control amount storage section 13-3 for storing.

Furthermore, the attitude control unit 14 is composed of a drive circuit (pulse generator) 9 and a pulse motor 8,
Based on the web position correction amount determined by the central processing unit 12, the web guide device 3 is controlled to control the web running attitude, thereby moving the position of the web a in the width direction.

Next, the operation of the web position control device configured as above will be explained.

FIG. 3 shows the movement of the web a before and after the control is applied. In FIG. 3, the horizontal axis represents time (in 10 ta(s)), and the vertical axis represents the amount of deviation from the target value. In addition, the various conditions are: ta: measurement interval of web a by the sensor, t: calculation time of the movement of web a, t2: dead time until the guide roller starts moving due to backlash of the pulse motor, etc., Pn: A
5n+2-A 5n.

First, the central processing unit 12 calculates A2 at t, (s).
-Ao is calculated, and it is determined which of the diagrams in FIG. 4 the vector quantity falls within. If it falls within the third position, the first control quantity is determined to be Δx1-βXPo. Then, when a signal is applied to the pulse motor 8 via the pulse generator 9 at time tl (S), a delay time t2
(s) t after elapsed = t 1 + t 2 (S )
At this point, the guide roller begins to move. As a result, ta(
's) moves by Δx1/2mm, t; t, +t2
At +ta(s) time A'4= A4-ΔX1/2
．． 1=2+t2+2ta A '5= A at (S)
5-ΔX1, and the first control using the first control amount ends.

Next, in Fig. 5, the movement of web a after being controlled by the first control amount is indicated by a dashed-dotted line A'n, and the movement of web a after being controlled by the second controlled variable is indicated by two points. In FIG. 3, the horizontal axis represents time (11'' ta(s)), and the vertical axis represents the amount of deviation from the target value. Further, as conditions, t3 is the time it takes for the edge guide roller to move and the edge of web a moves to a predetermined position, and Qn is the amount of deviation from the threshold value.

Central processing unit] 2, at the time of 5ta(s),
If A'5≧Xs, calculate Q,=A'5-Xs, and determine the second control amount as ΔX2-γXQ. Then, when a signal is given to the pulse motor 8 via the pulse generator 9, the guide roller starts moving after the dead time tz (S) has elapsed, and the web a is moved by ΔX between tq (S).
After moving by 2 mm, the first control using the second control amount is completed.

Thereafter, in the same manner as described above, the edge position in the web width direction is controlled by performing control using the first control amount and control using the second control amount in parallel at intervals of 5ta. The details of the above control contents are as shown in the flow diagram of FIG.

FIG. 7 and FIG. 8 show the above-mentioned first control amount.

The simulation results using the second control amount are shown respectively, and FIG. 7 shows the peak-to-peak value of the deviation amount when the values of the coefficients β and γ are changed, and FIG.
The standard deviation of each movement is shown. In addition, as shown in the figure
The dashed dotted lines indicate the peak-to-peak values and standard deviation values of the original data, respectively.

As shown in the figure, when the value of the coefficient γ is fixed and the value of the coefficient β is varied, the closer the value of the coefficient β is from 0 to 1, the better the control result becomes. Also, if the value of coefficient β is fixed and the value of coefficient γ is changed, the value of coefficient γ will change from 0 to close to 1.
<>, the control result becomes worse. - For example, γ=0.1
．． When β=0.9, when control is applied to the sudden movement, it can be seen that the web a meandering.

Also, if you look at the standard deviation, there is no data that is larger than the original data. This shows that control is working effectively for things other than sudden movements.

The original data of the movement of web a used for simulation is shown in FIG. 9, and γ=0.1. Figure 10 shows the movement when control is applied as β-〇. As shown, the peak-to-peak values range from 1.90 mm to 1.24
and 65%, with a standard deviation of 0.27 to 0.18.
The dispersion also decreased to 66%. Conversely, γ-0.9
．． The first diagram shows how meandering occurs when β = 0.1.
It is shown in Figure 1. Furthermore, the movement of web a during paper splicing is shown in FIG. 12, with β=0.5 fixed and γ=0.9.
γ-0.5. Figures 13 and 14 show the movement of web a when γ is changed to 0.1.

Each is shown in FIG. As shown in the figure, the closer the value of γ is from 0 to 1, the faster the recovery time after paper splicing.

As described above, the web position control device of this embodiment measures the edge position of the running web a in the width direction at every minute time interval ta, and adjusts the running position of the web a in the width direction based on the position information. This is controlled by changing the axial direction of the guide device, and the web mounting on the paper feed side is controlled so that the running web edge is at the specified position required for printing before or immediately after the web a starts running. -16= By performing the control according to this embodiment after adjusting the position of the deposited sprawl, it is possible to automatically and quickly properly position the edge of the web a at the specified position required for printing, and The fluctuation in the width direction due to meandering during steady running of the web a can be controlled and stabilized in the direction of always keeping it within the threshold value, thereby reducing the registration fluctuation of the pattern printed on the web due to the misalignment of the running part of the web a. It becomes possible to significantly reduce the size.

The gist of the present invention is to control the first control amount corresponding to the speed of the web a using the coefficients α and β, and the second control amount corresponding to the web position information (width direction deviation) using the coefficient γ. By determining each control amount and modifying the widthwise position of the web a in two steps (14) based on these two control amounts,
These coefficients α control the attitude of the web guide device 3 in real time to maintain stable web running.

By appropriately variably setting the values of β and γ depending on the type of practical machine, it is possible to select and set the optimum value when installing the practical machine.

-17= In addition, in the above embodiment, the case was described in which the edge position in the web width direction was measured at a pulse period ta, but the measurement is not limited to this, for example, by controlling pulses synchronized with the rotation period of a printing press. However, it is also possible to replace the above-mentioned time axis t with the print number axis S.

By repeatedly performing the above-described control processing, the position of the web W in the width direction is controlled.

[Effects of the Invention] As explained above, according to the present invention, the first control amount corresponding to the speed in the width direction of the web and the web position information (
The position of the web in the width direction is corrected in two steps based on two control variables, the second control variable corresponding to The edge position in the direction is always kept within the permissible limits, and
It is possible to provide a web position control device that can maintain the meandering width that occurs during web travel within an allowable limit in a short period of time.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a 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 FIGS. 3 and 5 are FIG. 4 is a diagram showing the motion vector threshold for determining the first control amount, and FIG. 6 is a diagram showing the motion of the web before and after the control is applied in the same embodiment. Flowcharts for explaining the simulation, FIGS. 7 and 8 show the coefficient β. Figures showing the difference in peaks and changes in standard deviation when γ is changed, Figure 9 is a diagram showing the original data of web movement used for simulation, Figures 10 and 11
The figure shows the movement of the web when the control is applied,
FIG. 12 is a diagram showing the original data of the movement of the web during paper splicing, and FIGS. 13 to 15 are diagrams each showing the movement of the web when control is applied. 1... Guide roller, 2 Guide roller, 3...
Web guide device, 4...Measuring sensor head, 5...
・Guide roller, 5a...Support shaft of guide roller 5, 6.Bracket on both sides, 7.Direction conversion rotation drive shaft,
8...Pulse motor-19...Drive circuit, 10...
Control box, 11... Web position measurement unit, 12...
Central processing unit, ]3... Controlled amount storage unit, 13-1.
. . . coefficient storage unit, 13-2 . . . first control amount storage unit,
13-3...Second control amount storage unit, 14...Attitude control unit. Applicant's agent Patent attorney Takehiko Suzue-20=

Claims (1)

[Scope of Claims] A web position control device for controlling the widthwise position of a running web in a rotary printing press, comprising: a web position measuring means for measuring the edge position of the web in the web width direction at regular time intervals; A first control amount for determining the speed in the width direction of the web from the web position information obtained from the web position measuring means and correcting the web position using different calculation methods depending on the magnitude of the speed. a first control amount calculation means for determining the web position, and a second control amount calculation means for determining the deviation from the target position of the web position control from the web position information obtained from the web position measuring means, and correcting the web position based on the deviation. a second control amount calculation means for determining a control amount; and a first control amount calculation means obtained from the first and second control amount calculation means.
and a web position determining means for determining an actual web position correction amount based on a second control amount, and an attitude control means for moving the position of the web in the width direction based on the web position correction amount determined by the web position determination means. A web position control device comprising: