JPH04351907A - Width rate-of-change measuring method - Google Patents

Abstract

PURPOSE:To continously and precisely measure the rate-of-change of the width in line between the feeding side and the winding side of a sheet-like member which is carried on a line. CONSTITUTION:In a width measuring device comprising light sources 2 and 2', CCD cameras 3 and 3', camera controllers 4 and 4', and displays 5 and 5', by mechanism 6 and 6' for detecting that the measured area at the feeding side measurement point in a sheet-like member 1 reaches at the winding side measurement point, the width data measured at the feeding side measurement point and the width data of the same location measured at the winding side measurement point are sequentially compared with each other by a processing device 7 containing a storing-oparating function, so that the rate-of-change of the width of the sheet-like member at the feeding side and at the winding side is continously determined, and the resulted value is displayed at a display 5'' as well as being continously recorded in a recorder.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention continuously measures on-line the rate of change in width due to width correction, thermal expansion and contraction, etc. on the unwinding side and winding side of sheet-like members such as films and steel plates that are transported on a line. Regarding how to.

0002

2. Description of the Related Art Conventionally, as a method for determining the width change rate of a sheet-like member on the feeding side and the winding side, a device for measuring the width is provided on the feeding side and the winding side, respectively.
It relied on measuring the width separately and later comparing each measurement.

[0003] With this method, it is difficult to determine in-line the rate of change in width from moment to moment on the feeding side and the winding side. In addition, especially in width straightening, depending on the rate of change, it is necessary to change operating conditions such as feeding speed, winding speed, or load on the object to be measured. was not possible inline.

0004

SUMMARY OF THE INVENTION It is an object of the present invention to provide a width change rate measuring method that can measure the width change rate of a conveyed sheet-like member inline, continuously, and with high precision. purpose.

[0005]

[Means for Solving the Problems] The present invention provides a light source installed at the upper or lower part of the unwinding side and the winding side of the sheet-like member, respectively, when measuring the width change rate between the unwinding side and the winding side of the sheet-like member. and receiving reflected light or transmitted light from both edges of the sheet-like member by the light source,
One or more image sensors are installed at the top or bottom of each of the feeding side and the winding side, and the width data measured at the feeding side measurement point and the position of the sheet-like member measured at the feeding side measurement point are determined by the winding side. By detecting that the side measurement point has been reached and sequentially comparing the measured width data at the same position at the winding side measurement point using a processing device equipped with memory and calculation functions, the winding side and winding side are This is a measurement method that continuously determines the rate of change in the width of the sheet-like member on the side. Next, the present invention will be explained in detail. [1] FIG. 1 is an apparatus configuration diagram showing an example of an apparatus for implementing the method according to the present invention.

In FIG. 1, a sheet-like member 1, which is an object to be measured, is being conveyed from the unwinding side to the winding side of the apparatus line. Light sources 2, 2' and image sensors 3, 3' are installed on the feeding side and the winding side, respectively.

[0007] The light sources 2, 2' are arranged so that reflected light or transmitted light from both edges of the sheet-like member is transmitted to the image sensor 3.
, 3', it may be placed at the bottom of the sheet-like member. Further, the light source may be an incandescent lamp or a fluorescent lamp. Furthermore, laser light may also be used, and there is no particular limitation.

On the other hand, the image sensor is a CCD (ch
MOS (metal-oxide SEM)
In addition, the arrangement state thereof may be a one-dimensional array (line shape) or a two-dimensional array shape (lattice shape). Normally, in width measurement, the signals detected by the image sensors 3, 3' are sent to the controllers 4, 4', where the signals are processed and the width measurement data of the feeding side and the winding side are generated. It is displayed on the display 5, 5'.

[0009] Here, in order to determine the width change rate, i.e., how the width data measured on the feeding side changes in the width on the winding side, the point measured on the feeding side is conveyed, At the measurement point on the winding side,
It is necessary to measure the same position. For this purpose, it is necessary to detect that the point measured on the unwinding side has reached the measuring point on the winding side.

One method is to use a timer to measure the time it takes for the unwinding side measuring point to reach the winding side measuring point. In FIG. 1, the above-mentioned time is measured in advance and the value is set in the timer 6. Further, in the timer 6', distance intervals at which measurements are performed are set as time values. At this time, timer 6' is
It shall have a mechanism to reset and re-measure immediately after the time measurement is completed. This value may be set to any value depending on the relationship between the line conveyance speed and the distance interval to be measured.

At the same time as width measurement is started on the feeding side, time measurement is started using timers 6 and 6', measurements are performed at set time intervals of timer 6', and the width measurement data is sequentially stored in a storage/arithmetic processing unit 7. let When timer 6 has finished measuring the set time, measure the winding side.
The value is compared with the measurement data of the same value on the unwinding side stored in the memory/processing unit 7, the width change rate is calculated, and the value is displayed on the display 5''. This is a method in which measurements are taken on the side as well at time intervals set by the timer 6' and sequentially compared with data measured on the feeding side to determine the width change rate.

[0012] Examples of the storage/computation processing device include a personal computer, a programmable controller, a sequencer, etc., and any device other than the above may be used as long as it has data storage/computation and output functions to the outside. good. [2] In the method according to [1] above, the conveyance speed of the line is
It is limited to times when it is always constant and does not change, and even slight variations in speed can cause large measurement errors. Further, when changing the conveyance speed of the line before starting operation, it is necessary to change the set values of the timers 6 and 6' each time.

[0013] As a method that is not affected by changes in the setting of the line conveyance speed or changes in speed during operation, markings are made at arbitrary constant intervals in the conveyance direction, for example, at the widthwise end of the sheet-like member to be measured. There is a method in which sensors are installed at measurement points on each of the feeding side and the winding side, and the markings are detected by the sensors. The marking may be on either the left or right side of the widthwise end of the sheet-like member, and is not particularly limited as long as it can be distinguished from the surface shape of the sheet-like member, such as perforation, paint color, or engraving. Further, the marking may be done in advance before the device is operated, or may be done in front of the feeding-side measurement point during the device operation.

On the other hand, the sensor is not particularly limited as long as it can detect the marking, such as a photoelectric sensor, photosensor, proximity sensor, or image sensor.

In FIG. 2, width measurement is started when a marking is detected by the sensor 16 at the feeding side measurement point, and from then on, measurement is performed every time a marking is detected, and the measurement data is stored in the storage/arithmetic processing unit 17. Let me remember it. When the marking first detected on the feeding side is detected by the sensor 16' installed at the measuring point on the winding side, measurement is started at the measuring point on the winding side, and the measurement data and the storage/processing unit 17 The width change rate is calculated by comparing it with the measurement data at the same position on the unwinding side, which was stored in The rate of change in width is determined by sequentially comparing with the stored data measured on the feeding side. [3] In the method according to [2] above, the line conveyance speed is not affected by setting changes in the line conveyance speed or speed changes during operation. First, stable width change rate measurement is possible, but since marking is performed directly on the object to be measured, the marking portion must be erased afterwards, which takes considerable time. However, depending on the nature, this marking may not be possible.

[0016] As a method for determining the width change rate without marking the object to be measured and without being affected by changes in the operating speed of the device described in [1] above, next, the points measured on the feeding side are There is a method of detecting that the winding side measurement point has been reached based on the distance.

In FIG. 3, the traveling distance of the sheet from the feeding side measurement to the winding side measurement point is measured in advance and set in the distance detector 26. Also distance detector
In step 26', the measurement interval is set to an arbitrary distance value. At this time, the distance detector 26' is of a mechanism that resets and remeasures the distance immediately after completing the distance measurement. The distance detector measures the moving distance by directly contacting the object to be measured, for example, a roller type mechanism, a non-contact mechanism, or a distance detector that measures the distance traveled by a drive unit involved in conveying the object. A mechanism that directly or indirectly measures the distance, such as a mechanism that calculates the distance from the rotation speed of the drive unit using a pulse encoder, etc., and is not particularly limited, but preferably a mechanism that does not come into direct contact with the object to be measured. be.

At the same time as the width measurement is started on the feeding side, the distance detectors 26 and 26' start measuring the moving distance of the object to be measured, and the distance detector 26' performs measurements at set distance intervals, and the measured data is The data are sequentially stored in the storage/arithmetic processing unit 27. When the measured distance of the distance detector 26 reaches the set value, measurement on the winding side is started, and that value and the measurement data of the same position on the feeding side stored in the memory/processing unit 27 are used. The width change rate is determined by comparing the width with the width change rate, and the value is displayed on the display 25''.Then, the width is measured at the set distance interval of the distance detector 26' on the winding side as well, and then on the unwinding side. This method calculates the width change rate by comparing the data with stored data at the same position.

[0019]

【Example】

Example 1 This is an example in which the method for measuring the width change rate of a sheet-like member described in [3] above was applied. In this example, the measuring device described in detail with reference to FIG.
xible Metal Clad Laminate
= FMCL) was installed in a device for correcting the interlayer dimensional difference, and the width change rate of the uncorrected portion on the feeding side and the portion after correction on the winding side of the above FMCL was measured. The composition is as follows. Here, the specifications of the various devices used in this measurement are described below. (1) Separate type light source lamp house and ring-shaped light guide ・Lamp house 150W halogen lamp Color temperature: 3100°K Average illumination: 400,000 lux ・Ring-shaped light guide Light conduction method using glass fiber (2) CCD camera image sensor :CCD 4096 element line type lens: 50mm/F2.8 Camera resolution: 6μ Camera field of view: 24.57mm Scan speed: 16msec/scan (3) Camera controller display: LED 7-digit input: Photocoupler isolation 3-point output: Photo Coupler isolation 7 points data output 2 points (4) Sequencer/CPU unit control method: Stored program method Program method: Ladder chart program capacity: Maximum 6974 words Number of input/output points: 48 input points, 64 output points, input unit DC 24V input 16 points *3 ・Output unit transistor output 32 points *2 ・Analog output unit voltage output: 0-10V or 1-5V current output: 4-
20mA total 2 points Resolution: 1/4096 (full scale) High-speed counter unit input signal: Encoder input A, B Operation mode: 6 types Counting speed: 50Kcps External output: 8 points (5) Pulse generator output pulse number: 500 pulse/rev (6) Display display method: LED 8 digits (7) Recorder operation method: Automatic balance type Measurement object: DC voltage, thermocouple, resistance temperature detector Recording method: Disposal felt pen Number of recording pens: 8 Display section: LED 20 digits/channel FMCL31, which is the object to be measured, has a thickness of 60μ and a width of 24
0 mm, and the interlayer dimensional difference is corrected by a specific device provided between the feeding-side guide roll 34 and the winding-side guide roll 35. Feeding side guide roll 34, winding side guide roll 3
At the top of 5 are light sources 32A, 32B, and 32C, respectively.
, 32D and CCD cameras 33A, 33B, 33
Two sets of C and 33D are arranged. Here, the F
Since the MCL has dimensional differences between layers as described above, it is curled and does not have a flat plate shape, making it impossible to accurately measure the width. Therefore, in this device, in order to bring the FMCL into close contact with the guide rolls on the feed-out side and the take-up side, and to detect the horizontal state with a CCD camera, the central axis and the CCD are placed directly above each guide roll. Further, both width ends of the FMCL are set in a positional relationship such that the optical axes of the cameras are on the same line, and the width ends of the FMCL are at the center of the field of view of the CCD camera.

The method for measuring the width and width change rate on the feeding side and winding side using this device will be described below. CCD camera 3
The amounts of reflected light from the guide rolls 34, 35 and the FMCL 31 captured by 3A, 33B, 33C, and 33D are binarized (distinguished into bright and dark) at a certain boundary value by camera controllers 36 and 36'. FMCL
Since the amount of light reflected from the guide rolls 31 is smaller than that from the guide rolls 34 and 35, the number of elements is measured as a dark area and the value is output to the sequencer 37. The sequencer 37 multiplies the number of measurement elements inputted from the camera controllers 36 and 36' by the resolution 6μ, converts it to the actual width at both ends of the FMCL 31 measured by the CCD camera, and then sets it to that value in advance. The actual width is calculated by adding the distances between the optical axes of the CCD cameras 33A and 33B and 33C and 33D (240 mm in this device) and displayed on the displays 38 and 38', as well as the analog output of the sequencer 37. The value is input to a recorder 39 via the unit and recorded. Next, regarding the width change rate measurement, as a means of knowing the transport distance of the FMCL 31 from the feeding side measurement point to the winding side measurement point,
A pulse generator 41 was installed in the feed-out side rotational drive unit 40 to provide a mechanism for generating pulses as the FMCL 31 is transported. With this mechanism, the number of pulses required for the measurement point on the feeding side to reach the measurement point on the winding side: Nt
Count p (in the case of this device: Ntp = 41696
0 pulse, distance is about 8350 mm), the measurement interval is converted to the number of pulses: Np, and the number of times the measurement is performed until the first measurement point at the feeding side measurement point reaches the winding side measurement point. Number of data: Nd to Np *Nd
Set each value so that = Ntp. Here, the values of Np and Nd are limited by the transport speed of the apparatus and the time required for data processing such as data acquisition in the sequencer 37, calculation, and output to the display/recorder. That is, when the conveyance speed is maximum, the pulse generator 41
It is necessary to set each value so that the time required to count the number of pulses of Np becomes large. With this device, the maximum conveying speed is 10m/min.
Since the time required for the sequencer to process the above data is approximately 130 msec, the measurement interval is 21.
A value larger than 67 mm, that is, the number of data that can be measured on the unwinding side and input into the sequencer before the unwinding side measurement point reaches the winding side measurement point is 385.
Must be less than or equal to 1. In this device, Nd = 32
0 pulses, Np = 1303 pulses. In addition, the high-speed counter unit of the sequencer is connected to the pulse generator 4.
After counting the number of output pulses Np from 1, output a signal,
The system has a repeating mechanism that immediately resets and starts counting again. Now, as shown in Figure 5,
Measure the width on the feeding side every time the number of Np pulses is counted,
The data is sequentially taken into the sequencer 37 and stored in the data memory. The storage address of this data is incremented by one each time the next data is imported, and when the number of imported data reaches Nd, that is, the first measurement point on the feeding side measurement point is on the winding side. When the measurement point is reached, measurement is started at the winding side measurement point, and the data is compared with the data stored in the data memory address Nd above to calculate the width change rate and display it on the display 38''. At the same time, it is recorded in the recorder 39. From then on, the winding side also measures every Np pulse count, and sequentially compares it with the corresponding measured data on the unwinding side (data stored at address Nd in the data memory). Then, the width change rate was continuously determined.The width change rate was 0.21 to 0.42%.

Example 2 An experiment was carried out using the same apparatus as in Example 1, but using two timers instead of the pulse generator. The line speed was kept constant at 1 m 2 /min. One timer was set to a time of 8.35 minutes for the feeding side measurement point to reach the winding side measurement point, and the other timer was set to a measurement interval of 3 seconds. On the feeding side, measurements are taken at 3 second intervals, and the values are sequentially stored in the data memory of the sequencer. When the number of data reaches 167, that is, the first measurement point on the feeding side is taken up. When the side measurement point is reached, measurement is started on the winding side, the data is compared with the data at address 167 in the data memory of the sequencer, the width change rate is determined, and the value is displayed on the display and recorded. record it on the meter. Thereafter, continuous measurement of the width change rate was carried out by performing the same data processing as described in Example 1. The width change rate is 0.2 ~
It was 0.3%.

Example 3 The width change rate was measured by marking the object to be measured and detecting it with a sensor. The markings are made by a mechanism in which a white marker is installed on a direct-acting solenoid coil, on the widthwise end of the sheet-like member (approximately 1cm inside from the end) at 3cm intervals in the conveyance direction, in front of the measurement point on the feeding side. This was done by painting. On the other hand, at each measurement point on the feeding side and the winding side, a light reflection type photosensor was installed in a positional relationship to detect the marking from above. On the feed-out side, each time the sensor detects the marking, a measurement is performed, and the values are sequentially loaded into the data memory of the sequencer. When the above marking reaches the measurement point on the winding side and the sensor detects the marking, the measurement is taken and compared with the data at the same point on the unwinding side that has been imported into the sequencer to find the width change rate and its value. is displayed on the display and recorded on the recorder. Thereafter, the width change rate was continuously measured using the same data processing method as described in Example 1. The width change rate was 0.2 to 0.4%.

[0023]

[Effects of the Invention] The present invention exhibits the following excellent effects. (1) It has become possible to continuously measure the width change rate of a sheet-like member during transportation with high precision, which has conventionally been impossible to measure continuously in-line. (2) Since the methods of Examples 1 and 3 are not affected by changes in the conveyance speed of the device, the measurement results according to the present invention can be fed back to the control system of the device and used to control the width of the object to be measured. Therefore, it can contribute to improving product quality and operating rate.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a device according to the present invention using a timer.

FIG. 2 is a diagram showing the configuration of an apparatus according to the present invention using a marking method.

FIG. 3 is a diagram showing the configuration of an apparatus according to the present invention using a distance detector.

FIG. 4 is an apparatus configuration diagram in an embodiment of the present invention.

FIG. 5 is a conceptual diagram showing a method of capturing and processing data on a sequencer data memory in an embodiment of the present invention.

[Explanation of symbols]

1, 11, 21: Sheet-like member (object to be measured) 2, 2
', 12, 12', 22, 22': light source 3, 3',
13, 13', 23, 23': image sensor 4,
4', 14, 14', 24, 24': Camera controller 5, 5', 5", 15, 15', 15", 25,
25', 25": Display 6, 6': Timer 7, 17, 27: Memory/processing unit 16, 16'
: Sensors 26, 26': Distance detector 31: FMCL 32A, 32B, 32C, 32D: Light sources 33A, 3
3B, 33C, 33D: CCD camera 34: Feeding side guide roll 35: Winding side guide roll 36, 36': Camera controller 37: Sequencer 38, 38', 38'': Display 39: Recorder 40: Feeding side rotation Drive section 41: Pulse generator

Claims (1)

[Claims] Claim 1: When measuring the width change rate between the unwinding side and the winding side of a sheet-like member, a light source is installed at the upper or lower part of the unwinding side and the winding side of the sheet-like member, respectively, and the light source is used to measure the width change of the sheet-like member. One or more image sensors are installed at the top or bottom of each of the feeding side and winding side to receive reflected light or transmitted light from both edges of the part, and the width data measured at the feeding side measurement point and the feeding side are measured. It is detected that the position of the sheet-like member measured at the side measurement point has reached the winding side measurement point, and the measured width data at the same position is measured at the winding side measurement point.
A method for measuring a rate of change in width, characterized in that the rate of change in the width of the sheet-like member on the unwinding side and on the winding side is continuously determined by sequentially comparing the rate of change using a processing device equipped with storage and calculation functions.