JPH01187160A - Web traveling position control device - Google Patents

Abstract

PURPOSE:To keep the web cross direction position constant at a required position by providing two detectors for detecting the web traveling position. CONSTITUTION:A detector 10 is disposed just before a folding portion inlet 14, thereby detecting whether a web keeps a correct traveling position or not at that position. A control device 11 is adapted to supervise output of the detector 10 and drive a driving device 12 to move a detector 6 in the direction of an arrow 6 in such a manner as to correct shifting on judging that the traveling position shifts. That is, a control set point of web edge position of an edge guide controller is changed. The air quantity or light quantity detected by the detector 6 is varied by the above change, whereby a moving frame 3 is rotated to control the traveling position of the web.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a web handling device such as a rotary printing press, a coater, a slitter, etc., and in particular, a method for correcting web meandering,
The present invention relates to a web running position control device that allows a web to always run at a constant position.

[Prior Art] As mentioned above, there are many known web handling devices such as rotary printing machines, but the web encounters many guide rolls while running, and the running direction is sometimes changed. Therefore, the web may meander during running.For this reason, web handling devices are generally equipped with a running position control device to maintain the widthwise position of the web, that is, the running position, at an appropriate position. The control methods include: ■ A method that controls the edge of one side of the web to be at a constant position based on the displacement of one end of the web (hereinafter referred to as edge guide controller); ■ A method that controls the edge of the web based on the displacement of both ends of the web. There are two known methods: one that controls the center position at a constant position, and one that controls the line drawn on the web at a constant position.In either of these control methods, the web position control is (a) A method in which a guide roll is provided in the web traveling path and the guide roll is tilted with respect to the web,
(b) @Method of moving the output reel and take-up reel, part 2
One example is the method.

Among the web controls classified as above, control that adopts ■ and (a), that is, the guide roll provided in the web running path is tilted with respect to the web so that the edge of the wave is at a fixed position. A conventional web running position control device will be described below, taking as an example a case where an edge guide controller for controlling the web position is adopted in a rotary printing press.

Figure 7 is a diagram showing a rotary printing press, in which 35 is a paper feed section;
6 is an infeed section, 37 is a first edge guide controller, 38 is a printing section, 39 is a drying section, 40 is a cooling section,
41 is a second edge guide controller, 42 is a web path section, 43 is a folding section, and 14 is a folding section entrance. In FIG. 7, the web pulled out from the paper feed section 35 is subjected to tensile run control etc. in the infeed section 36, and first guided to the first edge guide controller 37. The first edge guide controller 37 controls the traveling position of the web so that the printing section 38 prints at a predetermined position on the paper. The web that has exited the first edge guide controller 37 is subjected to well-known color printing such as offset printing in the order of black, blue, red, and yellow in a printing section 38, and then passes through a drying section 39 and a cooling section 40. It is guided to the edge guide controller 41 of No. 2. The second edge guide controller 41 controls the running position of the web so that the folding and cutting at the folding section 43 are performed at predetermined positions. The web exiting the second edge guide controller 41 passes through the web path section 42 and the folding section entrance 14 and enters the folding section 43.
Processing such as bending and cutting is performed here.

The configuration of the rotary printing press has been described above, and the first edge guide controller 37 and the second edge guide controller 41 are configured as shown in FIG. 8, for example. The configuration shown in FIG. 8 is well known, and the web is changed in running direction approximately at right angles by a roll L, and runs along a guide roll 4 attached to a movable frame 3 on a fixed frame 2. Then, the running direction can be changed again using roll 7.

The detector 6 detects whether or not the web is running at a predetermined position. If it is detected that the web is running at a predetermined position, it drives the hydraulic device 8 to move the moving frame 3 using the hydraulic cylinder 5. The fixed frame 2 is rotated clockwise or counterclockwise by an angle corresponding to the deviation. This causes the web to return to its determined running position. 9 is a power source for the hydraulic system. The configuration of the detector 6 includes one that blows air from one side and detects wind pressure from the other.
Alternatively, one may be used that emits light on one side and detects the amount of light on the other side. These are also well known.

The detector 6 can be moved in the direction of the arrow in the figure (the width direction of the web) manually or automatically by input using a numeric keypad or the like so that it can accommodate various paper widths.

[Problems to be Solved by the Invention] However, in the conventional type, even if the running position is controlled by the edge guide controller, the running position may still shift. That is, since the distance between the first edge guide controller 37 and the printing section 38 in FIG. Since there is a distance of about 10m, the traveling position may shift during that time, and as a result, the bending position or cutting position may shift.

To solve such problems, (1) the second edge guide control and roller 41 are installed immediately before the folding section entrance 14;
(2) Detector 6 of second edge guide controller 41
There are two possible solutions: providing the folding section at the entrance 14. However, method 1) is not possible due to the large size of the edge guide controller itself, and also because the web is sometimes divided into multiple rows by a slitter downstream of the current edge guide controller. , there is a problem that an edge guide controller corresponding to the number of web rows is required, and the method (2) also has the problem that the detector and guide control are too far apart, and when the web meandering occurs at high speed in the width direction of the web. There is a drawback that hunting occurs because appropriate control is not performed for objects that move. This has been confirmed by computer simulation, and as a practical matter, satisfactory control characteristics cannot be obtained unless the detector is placed near the guide roll as shown in FIG.

The present invention solves the above-mentioned problems, and even when there is a long distance between the time when the traveling position is controlled and the time when the next processing is performed, the position in the web width direction is not required. An object of the present invention is to provide a web running position control device that maintains a web running position at a constant position.

[Means for Solving the Problems] In order to achieve the above object, the web running position control device of the present invention is characterized in that two detectors for detecting the running position of the web are provided.

[Function] Since two detectors are provided in the present invention, the running position of the web can be controlled well even if the distance between the detector and the main body of the position control device is considerable.

[Example] Examples will be described below with reference to the drawings.

FIG. 1 is a diagram showing the configuration of one embodiment of the web running position control device according to the present invention, in which 10 is a detector, 11 is a control device, 12 is a drive device such as a motor, and 13 is a turn bar. , the same parts in the figures are given the same numbers. The same applies below.

The configuration of FIG. 1 is the same as that of FIG. 8 with a detector 10 and a control device 1.
1 drive device 12 is added.

The detector 10 is placed just in front of the folding section entrance 14, and detects whether the web is maintaining the correct running position at that position. The configuration of the detector 10 may be the same as that of the detector 6.The IJ control device 11 monitors the output of the detector 10, and when it determines that the traveling position has shifted, it drives the drive device 12 to detect it. The container 6 is moved in the direction of the arrow in the figure (the width direction of the web) so that the misalignment is corrected. In other words, the control target value of the web edge position of the conventional edge guide controller is changed. As a result, the amount of air or light detected by the detector 6 differs, and the moving frame 3 rotates accordingly, thereby controlling the running position of the web. In addition, in FIG. 1, the roll 7 and the detector 10 are
Although only one turner 13 is shown between the rollers and the rollers, in reality, a web path section consisting of many rolls is provided as shown by 42 in FIG. Control circuit 11
can be configured as shown in FIG. 2, for example. In Fig. 2, 15 is a CPU, 16 is a ROM, and 17 is a RAM.

18 is an A/D converter, 19 is a timer, 20 is an I10 bonito, and 21 is an SSR (solid state relay).The operation thereof will be explained with reference to the flowchart shown in FIG.

First, the output of the detector 10 when the web is running at a predetermined position is A/D converted by the A/D converter 18, and the R
Store in AM17 as the reference value of the traveling position (process A)
, the CPU 15 A/D converts the output of the detector 10 at predetermined time intervals, compares it with the reference value, and calculates the amount of deviation (process opening). If there is no difference as a result of the calculation, the CPU 15 waits until the next sampling. (Step C, Step 2) If there is a difference, calculate the direction and amount of movement of the detector 6 of the conventional edge guide controller from the amount of deviation, and based on that, calculate the direction and amount of movement of the detector 6 of the conventional edge guide controller.
The rotation direction and conduction time of the drive device 12 for moving the motor, for example, the motor, are calculated (Steps C and E). The time obtained as a result of the calculation is managed by the timer 19, and the I10 port is used for the time period during which the drive device 12 is turned on. Sets 20 specific bits.

Then, the I10 port 20 drives the 5SR21, and the drive device 12 is turned on for that time (to the process), and when the process is completed, it waits until the next sampling (process ①), and repeats the process from step ②.

What is important here is that, as mentioned in the section [Problems to be Solved by the Invention], if the distance between the detector and the main body of the control device is large, the control device is likely to become uncontrollable. I1m device for that purpose! It is necessary to optimally set the control characteristics by lowering the gain of l.

These series of processes are performed by the CPU 15;
Needless to say, the necessary programs and data are stored in the ROM 16, and the timer 19 is also stored in the A/D
It also manages the conversion sampling period. Furthermore, since the running speed of the web may vary depending on the object to be printed, the control timing can be automatically changed by detecting the rotational speed of the rotary press using an encoder (not shown). The timing of this control may be changed by inputting the traveling speed or rotational speed of the rotary press using a numeric keypad or the like.

Although the embodiment in which the web running position control device of the present invention is applied to a rotary printing press has been described above, the present invention is not limited to this and various modifications are possible. Some modified examples will be explained below.

In the embodiment shown in FIG. 1, the control target value was changed by moving the detector 6, but as shown in FIG.
Change the target value electrically by adding via
Guide rolls 4 can also be controlled. The configuration of the control device 11 in this case is shown in FIG.
The operation is the same as that shown in FIG. 2, except that the signal is output to the amplifier 23 as an analog signal.

Further, the control device 11 shown in FIG. 1 can also be configured with an analog circuit as shown in FIG. 6. In FIG. 6, a differential amplifier 30 receives the output of the detector 10 and the voltage value of the variable power supply 31, which is a reference value, and detects the difference between the two. If the variable power supply 31 is adjusted so that the reading on the voltmeter 33 is zero when the running position of the web is normal, it is possible to determine whether or not the web is meandering by monitoring the voltmeter 33. . The output of the differential amplifier 30 is converted into a corresponding pulse width by a voltage/pulse width conversion circuit 32, and is input to a motor drive circuit 34 for moving the detector 6.

In the above explanation, the guide rolls are hydraulically driven, but they can also be driven using a motor or the like. Furthermore, although the edge guide controller has been used as a method of controlling the traveling position, the present invention can be similarly applied to other control methods such as those described above. Furthermore, the present invention is not limited to rotary printing presses, but can be applied to any type of processing that applies some kind of processing to a continuously flowing wide running web.

Therefore, the web may be made of a wide variety of materials such as paper, film, and rolled steel plates.

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention, even if there is a considerable distance between the position where web running position control is performed and the position where processing is performed, the position where the web enters the processing section is determined. The position can be moved. Therefore, there is no need for the operator to manually adjust the position, reducing the workload and contributing to automatic operation of the machine.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of one embodiment of the web running position control device according to the present invention, FIG. 2 is a diagram showing one configuration example of the control device in FIG. 1, and FIG. 3 is a diagram showing the operation of the control device. A diagram showing a flowchart, FIG. 4 is a diagram showing another example of the control method, FIG. 5 is a diagram showing one configuration example of the control device in FIG. 4, and FIG. 6 is an example in which the control device is configured with an analog circuit. FIG. 7 is a diagram showing the configuration of a rotary printing press, and FIG. 8 is a diagram showing a conventional edge guide controller. DESCRIPTION OF SYMBOLS 1... Roll, 2... Fixed frame, 3... Moving frame, 4... Guide roll, 5... Hydraulic cylinder, 6... Detector, 7... Roll, 8...・Hydraulic system, 9... Power source, lO... Detector, 11... Control device, 12... Drive device, 13... Turn bar,
14...Folding section entrance, 15...CPU, 16...R
OM, 17...RAM, 18...A/D converter,
19...Timer, 20... I10 port, 21.
...SSR, 22, 23...Amplifier, 24...CP
U, 25. ...ROM, 26...RAM, 27...
・A/D converter, 28...timer, 29...D/A
Converter, 30... Differential amplifier, 31... Variable power supply,
32... Voltage/pulse width conversion circuit, 33... Voltmeter, 34... Motor drive circuit, 35... Paper feeding section, 36
... Infeed section, 37... First edge guide controller, 38... Printing section, 39... Drying section,
40... Cooling section, 41... Second edge guide controller, 42... Web path section, 43... Folding section. Applicant Dai Nippon Printing Co., Ltd. Representative Patent Attorney Hideo Sugai (4 others) Figure 2 Figure 5

Claims (5)

[Claims] (1) A web running position control device characterized by being provided with two detectors for detecting the running position of the web. (2) The web running position control device according to claim 1, wherein one of the detectors is arranged near the main body of the running position control device, and the other detector is arranged further away from the main body of the running position control device. (3) The web running position control device according to claim 1 or 2, wherein the material of the web is paper. (4) The web running position control device according to claim 1 or 2, wherein the material of the web is a film. (5) The web running position control device according to claim 1 or 2, wherein the material of the web is a steel plate.