JPH05139617A - Web follow controller - Google Patents

Abstract

PURPOSE:To figure out the edge position of a traveling web spaced from a measuring position. CONSTITUTION:A shape calculating section 21 calculates the edge shape of a traveling web 1 in positions A, B from an edge position measuring value to store the edge shape corresponding to the tracking pulse of a pulse generator 5 in a shape storing section 22. An edge position calculating section 23 calculates the edge position of the web in a position E from data in the shape storing section 22, the edge position measuring value in a position C and tracking pulses. A control section 24 controls an operating body 8 provided in the position E to correspond to a calculated edge position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traveling web control device for measuring the edge shape of a traveling web and performing follow-up control to the edge position of the web at a predetermined position apart from the measurement position.

[0002]

2. Description of the Related Art Thin steel plates, papers, synthetic resin films and the like are often manufactured and processed while continuously running as a band (web). FIG. 2 shows such a web running device. This device is to bond three webs together, and controls the edge position for aligning and aligning the edges of the webs H and I with the web G as a reference. If it has been printed on the web or otherwise processed,
Due to the meandering of the printing and processing steps, the edges of the web are uneven.

Therefore, if the products are stuck together as they are, the finished product will be defective and the products will not be uniform. The measuring nozzles J, K and L are set at positions determined by the cylinder M, the guide roll N is controlled so as to pass through the center of the measuring nozzle K, and the guide roll O is controlled so as to pass through the center of the measuring nozzle L. To do.

The same applies to the case where a trimmer that processes an edge instead of the webs H and I is controlled so as to follow the edge, or when a mark is placed at a certain distance from the edge of the web. 1 and 14 illustrate a trimmer, and FIG. 9 illustrates a marking device.

[0005]

By the way, the web does not always have a straight shape in the traveling direction due to the distortion generated in the manufacturing and processing steps. FIG. 3 shows a state in which the web is bent, the solid line shows the edge shape of the web, and the broken line shows the state without bending. Especially with a hard material such as a metal plate, the bent shape is maintained even if tension is applied to the web. Therefore, when following the edge position, the work body must follow the edge shape. ..

In order to measure the edge of the position where the running web passes, a detector may be installed at that position. Usually, there is a printing machine or a processing machine at that position.
The position of the edge cannot be detected and the detector can be installed only in the vicinity thereof. As shown in Fig. 3, the edge of the web is not always straight, and because the detector cannot be installed near the position where you want to measure the edge and you can only install it at a distant position, you can obtain the correct edge position at the required position. In many cases, if there is a relationship between the edge shape and the measurement position and the required position, processing or printing cannot be performed at the correct position.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a web follow-up control device that can realize an edge position at a position apart from a measurement position with respect to a running web as accurately as possible. And

[0008]

In order to achieve the above-mentioned object, a first measurement point and a second measurement point are provided at a distance ΔL from the upstream side in the traveling direction of the web, and the end portion of the web has a constant traveling length p. The difference H between the simultaneously measured values is calculated by repeating the simultaneous measurement for each time, and x = Σp, y = Σ (H · p / ΔL)
The shape measuring means for measuring the edge shape of the web, the speed detecting means for detecting the speed of the web, and the edge position of the web arranged at the third measurement point which is a distance k1 downstream from the second measurement point. The third measurement based on the third measurement unit that measures the speed, the end shape measured by the shape measurement unit, the web speed detected by the speed detection unit, the distance k1, and the detection value of the third measurement unit. Work position web edge calculation means for calculating the web end position of the work position at a distance k2 downstream of the section, a work body for performing work on the web provided at the work position, and the work position for the work body. Workpiece control means for outputting a control signal corresponding to the edge position of the web based on the output value of the web edge calculation means.

The first measurement point, the second measurement point,
At the third measurement point, only one end of the same side of the web is measured.

Further, at the first measurement point, the second measurement point, and the third measurement point, both ends of the web are measured.

[0011] Further, the first side from the upstream side in the running direction of the web.
The measurement point and the second measurement point are provided at a distance ΔL, and the edge of the web is repeatedly measured at every constant running length p, and the difference H between the simultaneously measured values is calculated, and x = Σp, y = Σ
(H · p / ΔL), a shape measuring means for measuring the edge shape of the web, a speed detecting means for detecting the speed of the web, and a first speed measuring means provided downstream of the second measurement point at a distance k1. 3 measurement points and a distance k3 downstream from the third measurement point
Has a fourth measurement point, the measurement values at the third measurement point and the fourth measurement point, the edge shape detected by the shape measuring unit, the detected web speed, and the distance k1. And k3
From the above, a work position web end calculation means for calculating the end position of the web at a work position at a distance k2 from the third measurement point between the third measurement point and the fourth measurement point; A work body provided for performing work on the web and a work body control means for outputting a control signal corresponding to the end position of the web to the work body based on the output value of the work position web edge calculation means are provided. It is a thing.

Further, the first measurement point, the second measurement point,
At the third measurement point and the fourth measurement point, only one end of the same side of the web is measured.

The first measurement point, the second measurement point,
At the third measurement point and the fourth measurement point, both ends of the web are measured.

[0014]

FIG. 4 is a diagram for explaining a method for measuring the edge shape of the web. A and B are measurement positions separated from each other by ΔL, and
It is assumed that the web has no twist between points A and B. Simultaneously measure a1 and b1 of the shape shown by the solid line. Next, the shapes indicated by the broken lines at which the web at point A reaches point B are simultaneously measured to obtain a2 and b2. Similarly, ai, b
get i. Since the distance between the A point and the B point is ΔL, the gradient is represented by Hi / ΔL when the change amount Hi = bi−ai.

FIG. 5 shows an edge shape passing through the measurement points A and B. FIG. 6 is a diagram in which the edge shape is reproduced with ΣΔL on the horizontal axis and ΣHi on the vertical axis with the start point set to 0. Thus, the running edge shape can be represented by taking ΔL on the horizontal axis and accumulating the variation amount Hi on the vertical axis.

FIG. 5 shows an example of simultaneous measurement at both A and B points for each running length ΔL for convenience of measurement and data processing, but the running length does not necessarily have to be set for each ΔL, and an appropriate constant running length is possible. Simultaneous measurement for each p is recommended. In this case, the total in the X-axis direction is x = Σp, and the total value in the y-axis direction is y =
Σ (Hi · p / ΔL). Hereafter, for practical purposes, p =
This will be described as ΔL.

In FIG. 13, the position A is the first measuring portion and the position B is the second measuring portion.
The measurement unit, the position C is the third measurement unit, the position D is the roll position, or the fourth measurement unit, and the distance between B and C is k1,
The distance between C and E is k2, and the distance between C and D is k3.
Here, the position E indicates a work position where the work body works on the end portion of the web. The exact position of the web edge in this working position is required.

With Si = ΣHi, the web speed is v, B
If the point at the distance x from the point is taken as the X point, the web shape measured between A and B reaches the X point after t = x / v time. Therefore, from the speed of the web and the distance from the position B, the measured shape of the web at that distance can be obtained. Si in FIG.
Represents this end shape. Sri is the r side of the web, Ssi
Represents the shape of the web on the s side, and Si represents the shape of the web of either r or s.

By the way, the running web shakes in a direction perpendicular to the running direction (width direction of the web). That is, a meandering phenomenon occurs. In FIG. 13, it is often the case that the meandering state detected at the position C reaches the position E of the downstream working body as it is without any problem in practical use. That is, it can be considered that the meandering amount and the edge shape directly move from the point C to the point E.

FIG. 7 is a view for explaining the end portion of the web when the position where the web passes at the position E is the same as the point C. It is assumed that the edge shape measured at the positions A and B is displaced in parallel by the width direction a. Sm is the end shape at position E, Sn
Is the end shape at position C. Wc is a measured value at position C.

That is, when the shift is measured at the position C by "a", the edge position of the position E is determined on the assumption that the position E is also shifted by "a". Thereby, the edge of the position E can be obtained by the following formula: Wc-Sn + Sm (1)

Next, the case where meandering occurs at the position D will be described. In this case, the fourth measuring unit 7 is provided at the position D. Figure 8
The method of obtaining the web meandering amount from the measurement values of the third measuring unit 6 (position C) and the fourth measuring unit 7 (position D) shown in FIG. To do. Wc is the edge measurement value at C, and Wd is the edge measurement value at position D.

In FIG. 8, the meandering amounts at the positions C, D and E are as follows. Meandering amount at position C = Wc-Sn = c Meandering amount at position D = Wd-Sl = d Meandering amount at position E = e + f e = (k3-k2) .c / k3 (2) f = k2.d / k3 (3) End position of position E = Sm + e + f = Sm + ((k3-k2) .c + k2.d) / k3 ... (4)

Since the shape of the web at the predetermined position can be reproduced as described above, the operation of the web following control device using this method will be described. First, a case will be described in which it is assumed that the web meandering amount at the point C reaches the target point E as it is, and there is no problem. The shape measuring means measures the edge shape of the web passing between the first measuring point and the second measuring point, and the speed detecting means detects the traveling speed of the web.
The third measuring unit measures the position of the edge at that position (position C). The work position web edge computing means is configured to measure the edge shape measured by the shape measuring means, the web speed, and the distances k1 and k2.
Then, the edge position of the web at the work position downstream of the third measuring unit by the distance k2 described in FIG. 7 is calculated from the edge measurement value of the third measuring unit. The work body control means outputs a control signal corresponding to the calculated edge position to the work body.

The above is the case where the meandering amount at the point C does not fluctuate as it is at the position E, but there is no limitation, that is, the case where the meandering while the web is running is taken into consideration will be described. The fourth measuring unit 7 is provided at the position of the distance k3 downstream from the third measuring unit 6, and the third measuring unit 6 is provided with the third measuring unit 7 by the method described in FIG.
The edge position of the web at the work position (position E) between the fourth measuring units is calculated. The work body is controlled in accordance with this edge position.

[0026]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a block diagram of a first embodiment of the present invention. 1 is a running web, 2 is a pinch roll, 3 is a first measuring unit provided at a position A for measuring the edge of the web 1, and 4 is a second measurement provided at a position B downstream from the position A at a distance ΔL. , 5 is a pulse generator that is provided on the pinch roll 2 and oscillates a pulse in proportion to the speed of the web 1, and 6 is a third measuring unit provided at a distance k1 downstream from the position B, and a position E
Is a working position where the working body works on the end portion of the web 1. Reference numeral 8 denotes a work body that works using the edge position information at the position E. As a working body, there are a trimmer that adjusts the edge width with a cutter, a line that neatly aligns the edge, and a marking device that marks a certain position from the edge.

FIG. 9 is a configuration diagram when a marking device is used as the working body 8. The marking device 8 moves the printing unit 11 in the width direction of the web 1 by the cylinder 10 to print the mark 12 at a position d from the edge end of the web 1.

Returning to FIG. 1, the shape calculation unit 21 includes the first measurement unit 3
From the measurement values of the second measurement unit 4 and the positions A and B described in FIG.
The cumulative value Si of the edge change amount Hi is calculated. The shape storage unit 22 sequentially stores the shape data Si, but stores the shape data Si in correspondence with the tracking pulse from the pulse oscillator 5. That is, a predetermined length of the web 1 is assigned to each pulse of the pulse oscillator 5, and when the web 1 runs, pulses are generated according to the running length. Data such as the web width and the curve of the web detected by the first and second measuring units 3 and 4 are sequentially stored by this pulse, and the stored data is output when the web 1 travels to a predetermined position. To do. Tracking refers to chasing the position of the web 1 to a predetermined position according to the running of the web 1.

The edge position calculation unit 23 calculates the edge position of the web 1 at the position E (that is, the value represented by the equation (1)) from the data of the third measurement unit 6 at the position C, the data of the shape storage unit 22 and the tracking pulse. To do. The control unit 24 controls the marking device 8 based on the calculated value so that the marking device 8 is marked at a predetermined position.

Next, the operation of the shape calculator 21 will be described. FIG. 10 is a flowchart showing the operation of the shape calculation unit 21.
The data measured at the points Ar, As, Br, Bs on both sides of the web are converted from the video signal into binary data (step 30). The data at the Ar point is input as fi (step 31), and the data at the Br point is input as gi (step 32). The same applies to the data at the points Ar and Br. These data are tracked by the pulse generator 5 into tracking pulses (steps 33 and 34).

FIG. 11 is a diagram for explaining tracked data. That is, each measured value is the distance ΔL between the positions A and B.
Are transmitted as pi and qi for each pulse corresponding to. Figure
Returning to 10, the difference between this pi and qi is calculated and set as Hi.

Next, moving to FIG. 12, the cumulative value ΣHr from 1 to i
Find i and ΣHsi and set them as Sri and Ssi respectively (step
35, 36). These Sri and Ssi are sent to the shape memory unit 22 by a tracking pulse.

FIG. 13 shows the shape data Sri, Ssi at each position on the web. When the web 1 is conveyed and reaches each position, the shape data at that position can be obtained.

The equation (1) described as the value calculated by the edge position calculating section 23 shows the case where the measurement is performed on only one side of the web 1 at the positions A, B and C in FIG. This applies when the working body 8 at the position E is only on one side on the same side as the measuring units at the positions A to C.

When the edge positions on both sides of the web are measured at the positions A, B and C, and the work 8 is provided on both sides at the position E as well, the edge position calculator 23 calculates the following equation.
In this case, it is assumed that the two work bodies are connected in the width direction of the web 1 at a predetermined interval.

Δ = (Wrc-Srn + Srm)-(Wsc-Ssn + Ssm) (5) where Wrc: r-side measurement value at position C Wsc: s-side measurement value at position C Srn, Srm, Ssn, Ssm Values shown in Figure 13

The control unit 24 outputs a control signal so that the center position of the connected work bodies 8 is displaced by δ.

When such control is performed, the mark printed near the edge by the marking device 8 at the position E in FIG. 1 is marked according to the edge shape of the web 1, so that the mark is formed according to the edge shape of the web. It will be printed.

Next, a second embodiment will be described with reference to FIG.
In the first embodiment, it is assumed that the meandering amount a detected at the third measurement point C moves to the position E of the work body 8 as it is. But,
In many cases, such a condition cannot be satisfied, and the web 1 performs meandering during traveling (that is, a combination of parallel movement and diagonal movement in the web width direction). The present embodiment is a device for calculating the edge position at the position E of the web 1 running while meandering in this way, and controlling the position of the work body 8 corresponding to this edge position.

The second embodiment differs from the first embodiment in that the fourth measuring unit 7 is provided at the position D and the roll 2 is provided downstream of this. In this embodiment, the edge position of the web 1 at the position E can be expressed by the equation (4) as described in FIG.

When the measuring section at the positions A, B, C and D and the work 8 at the position E are provided only at one end on the same side of the web 1, the edge position at the position E is expressed by the formula (4). It is represented by the value shown by, and this value is set to U, and the work body 8 is controlled corresponding to this U. U = Sm + (k3-k2) (Wc-Sn) / k3 + k2 (Wd-Sl) / k3 (6) The values of Sl, Sm, and Sn are the values on the r or s side in FIG. Wc is a measurement value of the third measurement unit 6, Wd is a measurement value of the fourth measurement unit 7.

Next, as shown in FIG. 14, when the measuring section and the working body 8 are provided on both sides of the web 1, the procedure is as follows. δ = Ur-Us (7) Ur = Srm + (k3-k2) · (Wrc-Srn) /
k3 + k2 (Wrd-Srl) / k3 Us = Ssm + (k3-k2). (Wsc-Ssn) /
k3 + k2 (Wsd-Ssl) / k3 Ur: Calculated value of r-side edge position at position E Us: Calculated value of s-side edge position at position E Here, the work body 8 is arranged on both sides of the web 1, and both are It is mechanically connected. In this case, the central positions of both working bodies 8 are controlled so as to move corresponding to δ. Also Srr ~
The value of FIG. 13 is used for Ssn.

In the present embodiment, when the working body 8 is a marking device, even if the web 1 has a large meandering amount, a mark is printed along the unevenness of the edge of the web 1 as in the first embodiment.

[0044]

As is apparent from the above description, according to the present invention, the edge of a running web can be measured at two points at the same time, the edge shape can be obtained from the value, and the edge position at an arbitrary position can be calculated. Therefore, even if the work body is provided at a position where it cannot be directly measured, the work body can be controlled according to the calculated value of the work body installation position.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a first embodiment of the present invention.

FIG. 2 is a diagram showing a conventional example of a web traveling device.

FIG. 3 is a diagram for explaining bending of a web and unevenness of an edge.

FIG. 4 is a diagram illustrating a method for measuring an edge shape of a web.

5 is a diagram showing an edge shape passing through measurement points A and B. FIG.

FIG. 6 is a diagram in which a measured edge shape is reproduced.

FIG. 7 is an explanatory diagram for calculating the edge position of the web at position E when the meandering amount at position C remains unchanged at position E.

FIG. 8 is an explanatory diagram for calculating an edge position in consideration of meandering at a position E from edge measurement values at positions C and D.

FIG. 9 is a configuration diagram of a marking device.

FIG. 10 is an operation flowchart of the shape calculation unit.

FIG. 11 is a diagram illustrating tracked data.

FIG. 12 is a flowchart following on from FIG.

FIG. 13 is a diagram showing tracking data at each position.

FIG. 14 is a configuration diagram of a second embodiment.

[Explanation of reference numerals] 1 web 2 pinch roll 3 first measuring unit 4 second measuring unit 5 pulse generator 6 third measuring unit 7 fourth measuring unit 8 working body 21 shape calculation unit 22 shape storage unit 23, edge position calculation Part 24 Control unit

Claims (6)

[Claims] 1. A first measurement point and a second measurement point are provided at a distance .DELTA.L from the upstream side in the running direction of the web, and the edge of the web is repeatedly measured at a constant running length p at the same time. The value difference H is calculated, and x = Σp, y = Σ (H
p / ΔL), a shape measuring means for measuring the edge shape of the web, a speed detecting means for detecting the speed of the web, and a third measuring point located a distance k1 downstream from the second measuring point. From the third measurement unit that measures the end position of the, the end shape measured by the shape measurement unit, the web speed detected by the speed detection unit, the distance k1, and the detection value of the third measurement unit. Distance k downstream from the third measuring unit
2 work position web edge calculating means for calculating the web edge position of the work position, a work body provided at the work position for performing work on the web, and the work position web edge calculating means for the work body. A web follow-up control device comprising: a work body control means for outputting a control signal corresponding to an end position of the web based on the output value. 2. The first measuring point, the second measuring point, and the third measuring point are configured to measure only one end of the same side of the web. Web tracking control device. 3. The web follow-up control device according to claim 1, wherein both ends of the web are measured at the first measurement point, the second measurement point, and the third measurement point. .. 4. The first measurement point and the second measurement point are provided at a distance .DELTA.L from the upstream side in the running direction of the web, and the edge portion of the web is repeatedly measured simultaneously for each constant running length p to perform simultaneous measurement. The value difference H is calculated, and x = Σp, y = Σ (H
p / ΔL), a shape measuring means for measuring the edge shape of the web, a speed detecting means for detecting the speed of the web, and a third measuring point provided at a distance k1 downstream from the second measuring point. And a fourth measurement point provided at a position of a distance k3 downstream of the third measurement point, the measurement values of the third measurement point and the fourth measurement point, and the end shape detected by the shape measuring unit. ,
From the detected web speed and the distances k1 and k3,
Work position web edge calculating means for calculating an edge position of the web at a work position at a distance k2 from the third measurement point between the third measurement point and the fourth measurement point, and a web provided at the work position. And a work body control means for outputting a control signal corresponding to the end position of the web to the work body based on the output value of the work position web edge calculation means. Web tracking control device. 5. At the first measurement point, the second measurement point, the third measurement point, and the fourth measurement point, only one end of the same side of the web is measured. The web following control device according to claim 4. 6. The end portions on both sides of the web are measured at the first measurement point, the second measurement point, the third measurement point, and the fourth measurement point. The described web following control device.