JPH05139589A - Running web control device - Google Patents

Abstract

PURPOSE:To control the edge position of a running web shifted away from a measuring position. CONSTITUTION:A shape computing part computes edge shapes of a running web 1 at positions A, B in accordance with measured value of edge positions of the running web 1, and thus computed edge shapes is stored in a shape memory part 22, corresponding to tracking pulses from a pulse generator 5, and an edge position computing part 23 computes edge positions of the web at a position E in accordance with data from the shape memory part 22, edge position measured values at a position C, and the tracking pulses. The control part 24 control an intermediate guide roll 9 so as to eliminate the difference between the edge position calculated values and desired values.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a running web control device for measuring the end shape of a running web and controlling the end 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. An intermediate guide roll device is provided between the two sets of pinch rolls to detect the deviation in the traveling direction of the web and correct it in the correct direction. The detector detects the edge of the web, and the EPC (Edge Position Controller) adjuster operates the operating cylinder so that the difference between the target value and the detected value becomes zero. This causes the intermediate guide roll to rotate about the pivot point and hold the web in the correct running direction.

[0003]

By the way, a relatively hard web such as a steel plate does not necessarily have a straight shape in the running direction due to a distortion generated in the manufacturing and processing steps. .. FIG. 3 shows the state in which the web is bent, and the solid line shows the edge shape of the web.
The broken line shows the state without bending.

To measure the edge of the position where the running web passes, a detector may be installed at that position. Normally, however, there is a printing machine at that position, and the position cannot be detected. Only the detector can be installed.
As shown in Fig. 3, the edge of the web is not always straight, and the detector cannot be installed near the position where the edge is to be measured, and it can only be installed at a distant position. In many cases, the position cannot be obtained, and when there is such 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 problems, and an object of the present invention is to provide a running web control device that can realize an edge position at a position apart from a measurement position on a running web as accurately as possible. And

[0006]

In order to achieve the above-mentioned object, a first measurement point and a second measurement point are provided at a constant distance ΔL from the upstream side in the traveling direction of the web, and the end portion of the web is at a constant traveling length. The difference H between the values measured at the same time is calculated by repeating the measurement printing for each p, and x = Σp, y = Σ (H · p / Δ
L), shape measuring means for measuring the edge shape of the web; speed detecting means for detecting the speed of the web;
A third measuring portion arranged at a third measuring point downstream of the measuring point at a distance k1 to measure the end position of the web, and a roll arranged at a position downstream of the third measuring point at a distance k3. The edge shape measured by the shape measuring unit, the web speed detected by the speed detecting unit, the distances k1 and k3, and the detection value of the third measuring unit,
The control position web edge calculating means for calculating the web edge position of the control position at the distance k2 downstream from the measuring section, and the control position web edge provided between the second measurement point and the third measurement point. A web guide means for calculating the difference between the web end position of the control position calculated by the calculation means and the target value and controlling the web so as to eliminate this difference is provided.

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.

[0009] 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 constant distance ΔL, and the edge portion of the web is simultaneously measured for each constant traveling length p to calculate the difference H between the simultaneously measured values, 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 distance k1 downstream from the second measurement point are provided. The third measurement point and the distance k downstream from this third measurement point
3rd measurement point provided in the position of 3, and the measured value of a 3rd measurement point and a 4th measurement point, the edge part shape which the said shape measuring means detected, the speed of the detected web, and the said distance. k1 and k
3, the control position web edge calculating means for calculating the edge position of the web at the control position at the distance k2 from the third measurement point between the third measurement point and the fourth measurement point; The difference between the control position web edge position calculated by the control position web edge calculation means and the target value is provided between the measurement point and the third measurement point, and the web is controlled to eliminate this difference. And a web guide means for doing so.

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.

[0012]

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
Assume 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 and bi are obtained. Since the distance between points A and B is ΔL, the amount of change Hi
= Bi-ai, the gradient is represented by Hi / ΔL.

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 in which simultaneous measurement is performed at both A and B points for each traveling length ΔL for convenience of measurement and data processing, but the traveling length is not limited to each ΔL, and simultaneous measurement may be performed for each appropriate fixed length p. .. In this case, the total in the X-axis direction is x = Σp, and the total in the y-axis direction is y = Σ (Hi · p /
ΔL). For convenience of explanation, the following description will be made with p = 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 control position for controlling the position of the web edge.

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 is deflected in the direction perpendicular to the running direction (the width direction of the web). That is, a meandering phenomenon occurs. In FIG. 13, when the distance k3 between the position C and the position D where the roll is located is long to some extent, the web edge is uneven at the position D, but the uneven line (that is, the virtual average line) is practically the width of the web. It may be considered to not change in direction.

FIG. 7 is a view for explaining the relationship for controlling the end portion of the web to always pass through the desired position at position E when the position where the virtual average line of the web passes does not change at position D. The curve p represents the end shape before control, and the curve q
Represents an end shape controlled to pass through a desired position at position E. Sm is the end shape at position E, and Sn is the end shape at position C. To correct only Sm at point E, it is necessary to correct only point b at point C. Considering addition of the end shape Sn to this, the edge position a at point C is as follows.

B = Sm · k3 / (k3-k2) (1) a = Sn-b (2) That is, the measured value Wc at the position C becomes Wc = a = Sn-b (3) When the web is controlled at position E, the end of the web at position E is on the desired position.

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 (4) f = k2 · d / k3 (5) End position of position E = Sm + e + f = Sm + ((k3-k2) .c + k2.d) / k3 ... (6)

Since the shape of the web at the predetermined position can be reproduced as described above, the operation of the running web control apparatus using this method will be described. First, in the roll position D, the case where the position of the web itself is on the virtual average line will be described. The shape measuring means measures the edge shape of the web passing between the first measuring point and the second measuring point, the speed detecting means detects the traveling speed of the web, and the third measuring section detects the edge at that position (position C). Measure the position of. The control position web edge calculating means calculates the edge shape measured by the shape measuring means, the web speed, the distances k1 and k2, and the edge measurement value of the third measuring section, and the distance k2 from the third measuring section described in FIG. The value to be taken by the measurement value at the third measurement point (position C) when the edge position of the web at the downstream control position is on the virtual average line is calculated. The web guide means controls the web so that the measurement value of the third measuring unit becomes the value to be taken.

The above is the case where the position of the virtual average line of the edge does not change at the position D, but there is no such limitation.
That is, a description will be given in the case where the meandering while the web is running is taken into consideration. The fourth measuring unit 7 is provided at the position of the distance k3 downstream of the third measuring unit 6, and the edge position of the web at the control position (position E) between the third and fourth measuring units is calculated by the method described in FIG. To do. By controlling the web by the web guide means so as to eliminate the difference between the edge position and the target value,
At the control position, the web edge will pass through the target position.

[0023]

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 control position where it is desired to control the end position of the web 1 to a predetermined position. Reference numeral 8 represents an operating body that operates using the edge position information at the position E. In this embodiment, a trimmer that adjusts the edge width with a cutter or uses a trimmer to cleanly align the edges is used, but a marking device that marks a certain position from the edge may be used. The position A (first measuring unit) and the position B (second measuring unit) are installed in a place where a force perpendicular to the running direction of the web is not applied to the web, that is, a place where no twist is generated.

An intermediate guide roll 9 controls the web so that the end of the web reaches a target value at the control position E. FIG. 9 is a configuration diagram of the intermediate guide roll 9. The intermediate guide roll rotates the roll unit 12 around the pivot 11 by the cylinder 10 to control the traveling direction of the web 1.
Since the center of rotation of the roll unit 12 is located at the entrance roll of the web 1, the twist of the web 1 at the upstream positions A and B is small even when the web 1 is guided.

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 determines the edge position of the web 1 at the position E based on the data of the third measuring unit 6 at the position C, the data of the shape storage unit 22 and the tracking pulse.
As described with reference to FIG. 7, the estimated measurement value at the C position (that is, the value represented by the equation (3)) is calculated. The control unit 24 compares the calculated value with the target value, and outputs a control signal for setting the difference to 0 to the intermediate guide roll 9.

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
Return to 10 and find the difference between pi and qi.

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 (3) 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 actuating body 8 at the position E is only on one side on the same side as the measuring unit 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 actuating bodies 8 are provided on both sides at the position E as well, the edge position calculator 23 calculates the following equation.

Wrc-Wsc = (Srn-Ssn)-(Srm-Ssm). k3 / (k3-k2) (7) where Wrc: r-side measured value at position C Wsc: s-side measured value at position C

The control unit 24 outputs a control signal to the intermediate guide roll 9 so that the measured value at the position C satisfies the expression (7).

When such control is performed, the shape of the web 1 whose edge is cut by the trimmer 8 at the position E in FIG. 1 is cut into a certain width in accordance with the edge shape of the web 1, so that the edge shape of the web is obtained. The shape follows.

Next, a second embodiment will be described with reference to FIG.
In this figure, the same symbols as in FIG. 1 represent the same contents. This embodiment shows a case in which the cutting width of the edge is made as small as possible and cutting is performed in a straight line. This embodiment differs from the first embodiment in the target value set by the edge position calculation unit 23.

The target value must be set so that the position of the cutter of the trimmer 8 is inside the unevenness of the edge shown by the broken line in FIG. 14 and from the viewpoint of effective utilization of the web 1 the cutout area is as small as possible. is there. If the distance between the intermediate guide roll 9 and the roll provided at the position D is long to some extent, it is assumed that at the position D, the position where the virtual average line of the unevenness of the edges of the web 1 passes does not change in the width direction of the web 1. be able to. Assuming this, position C
If the web is controlled so that the edge shape measured at the positions A and B can be reproduced at the position A, the edge shape measured at the positions A and B can also be reproduced at the position E. In this way, if the blade of the cutter is set slightly inside the maximum concave portion of the unevenness of the edge at the position E, the amount of cutting can be reduced and the web edges can be straightened.

When the measuring section at the positions A, B and C and the trimmer 8 at the position E are provided only at one end of the same side of the web 1, the third measuring section 6 at the position C is provided.
The value measured by Sn is Sn (Srn or Ss in FIG.
The intermediate guide roll 9 controls the web 1 so as to be n).

As shown in FIG. 14, when the measuring section and the actuating body 8 are located on both sides of the web 1 at the positions A, B, C and E,
The intermediate guide roll 9 controls the web 1 so that the value of the third measuring unit 6 at the position C satisfies the following formula. Wrc-Wsc = Srn-Ssn (8) Wrc: r-was measured value at position C Wsc: s-side measured value at position C

Next, a third embodiment will be described with reference to FIG.
In the first and second examples, the roll was installed at the position D, and it was assumed that the position at which the virtual average line of the unevenness of the edge of the web 1 passes was unchanged at this position. In order for this assumption to hold,
Positions C and D require some length. However, there are many cases where 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). In this embodiment, the edge position at the position E of the web 1 running while meandering in this way is calculated, the edge position is controlled to a target value by the intermediate roll guide 9, and the operating body 8 provided at the position E is calculated.
Is a device for processing the web 1.

The third embodiment is different from the first embodiment in that the fourth measuring section 7 is provided at the position D and the roll 2 is provided downstream of this. In the present embodiment, the edge position of the web 1 at the position E can be expressed by the equation (6) as described in FIG.

When the measuring section at the positions A, B, C and D and the actuating body 8 at the position E are provided only at one end on the same side of the web 1, the target value of the edge position at the position E is U. Then, the control unit 24 instructs the intermediate guide roll 9 so that the value of the equation (6) calculated by the edge position calculation unit 23 becomes U, and the intermediate guide roll 9 controls the web 1 according to this instruction. U = Sm + (k3-k2) * (Wc-Sn) / k3 + k2 (Wd-Sl) / k3 (9) 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. 15, when the measuring section and the actuating body 8 are provided on both sides of the web 1, the procedure is as follows. Ur-Us = Vr-Vs (10) Vr = Srm + (k3-k2). (Wrc-Srn) / k3 + k2 (Wrd-Srl) / k3 Vs = Ssm + (k3-k2). (Wsc-Ssn) / k3 + k2 (Wsd-Ssl) / k3 Ur: r side target value Us: s side target value Here, if Ur = Us, the intermediate guide roll 9 may control the web so that Vr = Vs. Also Srr ~
The value of FIG. 13 is used for Ssn.

In this embodiment, when the actuating member 8 is a trimmer, even if the amount of meandering of the web 1 is large, a certain amount of the edge of the web 1 is cut along the unevenness of the edge of the web 1 as in the first embodiment. Is output.

[0045]

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, it is possible to control the edge position of the position that cannot be directly measured to be the target value.

[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 control 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 a diagram showing conditions to be satisfied at position C so that the edge of the web passes on the virtual average line at position E when the position of the virtual average line does not change at position D.

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 an intermediate guide roll.

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.

FIG. 15 is a configuration diagram of a third embodiment.

[Explanation of symbols]

 1 web 2 pinch roll 3 1st measurement part 4 2nd measurement part 5 pulse generator 6 3rd measurement part 7 4th measurement part 8 actuation body 9 intermediate guide roll 21 shape calculation part 22 shape storage part 23, edge position calculation part 24 Control unit

Claims (6)

[Claims] 1. Simultaneous measurement by repeatedly providing a first measurement point and a second measurement point at a constant distance ΔL from the upstream side in the running direction of the web, and simultaneously measuring the edge of the web for each constant running length p. The difference H between the calculated 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 third measuring point located a distance k1 downstream from the second measuring point. And a third measuring unit for measuring the end position of the web, a roll arranged at a position separated by a distance k3 downstream from the third measuring point, an end shape measured by the shape measuring unit, and the speed. A control position web end for calculating a web end position of a control position at a distance k2 downstream of the third measuring unit from the web speed detected by the detecting unit, the distances k1 and k3, and the detection values of the third measuring unit. Part calculation means,
Provided between the second measurement point and the third measurement point, the difference between the web edge position of the control position calculated by the control position web edge calculation means and the target is calculated, and control is performed to eliminate this difference. And a web guide means for controlling the traveling web. 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. Traveling web controller. 3. The traveling web control device according to claim 1, wherein the first measurement point, the second measurement point, and the third measurement point measure the end portions on both sides of the web. .. 4. The first measurement point and the second measurement point are provided at a constant distance ΔL from the upstream side in the running direction of the web, and the edge portion of the web is repeatedly measured at a constant running length p at the same time. The difference H between the 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, the control position web edge calculating means for calculating the edge position of the web at the control position at the distance k2 from the third measurement point between the third measurement point and the fourth measurement point, and the second measurement. Provided between the point and the third measurement point, the difference between the control position web edge position calculated by the control position web edge calculation means and the target value is calculated, and the web is controlled so as to eliminate this difference. A traveling web control device comprising: a web guide means. 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 traveling web 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. A running web control device as described.