JPH02238316A - Thickness meter - Google Patents

Abstract

PURPOSE:To set or alter a scanning range within a real time on the basis of the detection output of a measuring position detector by providing the measuring position detector, an end part operation part and a scanning range operation means. CONSTITUTION:A thickness measuring device 30 is mainly constituted of a detection part 14, an end part operation means 15 and a scanning range operation means 16. The detection part 14 consists of the radiation source container 2 provided to a frame 5, the detector 3A provided in opposed relation to the container 2 and a measuring position detector 6. The end part operation part 15 operates the end part of an object 1 to be measured on the basis of the output of the detector 3A in the detection part 14. The scanning range operation means 16 operates the scanning range of the detection part 14 on the basis of the operative result of the end part operation means 15 and the measuring position signal outputted from the measuring position detector 6. Therefore, the output signal of the detector aiming only the operation of the thickness of the object to be measured is adapted as a signal for detecting the end part of the object to be measured.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a thickness meter that measures the thickness of objects to be measured such as paper, film, aluminum, copper plates, iron plates, etc. using light or radiation. In particular, the present invention relates to thickness correction capable of detecting the edge and measuring the width of an object to be measured based on the output of a light or radiation detector.

(Prior Art) FIG. 4 shows a schematic configuration diagram of a conventional thickness gauge. In the figure, the thickness gage 20 includes a detection section 3 consisting of a 4I source container 2 provided on a frame 5 and a detector 3A provided opposite to this source container 2.

By scanning the detection unit 3 in the width direction of the object to be measured 1 that is conveyed in a direction substantially perpendicular to the frame 5,
The thickness of the object to be measured 7 is measured based on the output of the detector 3A. At this time, the scanning width of the inspection section Q was selected, and the detection section 3 scanned in the width direction between the selected scanning widths. In addition, by providing an A point end detection sensor 4A and a B point end detection sensor 4B such as an ultrasonic sensor, optical sensor, or proximity switch separately from the detector 3A, the measurement ends A point and 8 points can be detected and scanned. The scope had been determined. Note that in order to measure the width of the object to be measured 1, a point A/8 point edge detection sensor 4A. It was necessary to be equipped with a width measuring means that calculated from 48 mag.

(Problem to be Solved by the Invention) However, according to such technical means, the operator must intervene and set the scanning width of the detection unit 3 every time the object to be measured changes, and the operator must intervene until the measurement starts. requires effort and time. Furthermore, since the end of the object to be measured 1 is not always transported to the same position, it is unlikely that the scanning range set at the start of the measurement will maintain its validity until the end of the measurement. The problem was that there was no limit. In addition, it is necessary to equip a signal processing means etc. for processing the output signal of the edge detector provided separately from the detector 3A, which not only increases the equipment cost but also complicates the processing means. This makes maintenance and upkeep complicated. This point is a problem that is also pointed out when measuring the thickness and width of the object 1 to be measured.

In view of the above-mentioned points, the present invention effectively solves the problems of the prior art, and provides a thickness gauge in which the scanning range can be set or changed in real time based on the detection output of a detector. It is an object of the present invention to provide a thickness gauge that can measure the width of a workpiece at the same time as the thickness.

(Another Means to Solve the Problem) In order to achieve such an object, the present invention uses a thickness gauge as follows. a measurement position detector provided in a detection unit comprising an 1A source and a detector to detect the measurement position of the object to be measured; and an edge calculation means for calculating the edge of the object to be measured based on the output of the detector. , scanning range calculation means for calculating the scanning range of the detection section based on the output of the end calculation means and the output of the measurement position detector.

Further, according to the present invention, the edge calculation means includes a reference value setting device into which the output of the detector is input and a reference value for detecting the edge of the object to be measured is set based on the output of the detector; The measuring device includes an edge calculator which receives the reference value of the reference value setter and the output of the detector and calculates the edge of the object to be measured.

The scanning range calculation means receives input of a deceleration base setting device for setting the amount of deceleration of the scanning speed of the detection section, the output of the end calculation device, and the measurement position signal output from the measurement position detector. It is comprised of a scanning range generator which calculates a scanning range and outputs a detection part driving signal based on the calculation result of the scanning range and the deceleration (1) to the detection part driving means.

Furthermore, in the present invention, a width calculator is connected to the measurement position detector and the end calculation means to the thickness gauge, and calculates the width of the object to be measured based on the measurement position signal and the end calculation result. Prepared.

<<Operation>> The pane calculation means calculates the edge of the object to be measured based on the output of the detector, and the scanning range calculation means uses the sieve result of the edge calculation means and the measurement output from the measurement position detector. The scanning range of the detection unit is calculated based on the position signal. More specifically,
The edge calculation means sets a reference value for edge detection based on the detection output of the detector in the reference value setter, and sets the edge detection reference value based on the detection output of the detector and the edge detection output from the reference value setter in the edge calculation unit. Calculate the edge of the object to be measured based on the reference value of
The scanning range setting means performs detection in the scanning range computing unit based on the output of the end computing unit, the measurement position signal output from the measurement position detector, and the deceleration amount of the detection section input from the deceleration amount setting device. A part drive signal is generated, and this drive signal is output to a drive means that causes the detection part to scan the object to be measured.

In addition, the width calculation unit calculates the width of the object to be measured based on the measurement position signal output from the measurement position detector and the output of the end calculation unit. Measure the width at the same time as the thickness.

Therefore, the output signal of the detector, which is intended only for calculating the thickness of the object to be measured, is applied to detect the edge of the object to be measured, so that the scanning range of the detection unit can be can be set online, and the width of the object to be measured can be measured at the same time as the thickness measurement, improving the performance of the thickness meter.
Its handling is easy.

(Example) Next, an example of the present invention will be described in detail based on the drawings.

FIG. 1 is a schematic configuration diagram of an embodiment of the present invention, and FIG.
A block diagram of the figure is shown. In the figure, the thickness gage 30 mainly includes a detection section 14, an edge calculation means 15, and a scanning range calculation means 16.

The detection unit 14 includes a radiation source container 2 provided in the frame 5,
It consists of a detector 3A and a measurement position detector 6, which are provided opposite to the radiation source container 2, and can freely scan in the direction of point A or point B while measuring the object to be measured 1. For example, A
When the point is reached, the amount of PJ incident on the detector 3A changes to the value when the object to be measured 1 is not present. This point A is determined to be the end of the object to be measured 1, the position data from the measurement position detector 6 is read, and the detection section 14 is caused to scan in the direction of point B.

When it reaches point B, it judges and processes it in the same way as it did for point A, without repeating the scanning in eight directions again. In addition, C. Point D is absorbed according to the output thickness of the detector 3A as shown in FIG. 4, and is incident on the detector 3A.

This detector 3A converts the incident dose into an electrical signal and outputs it to the thickness calculation section 7. The thickness calculation section 7 subjects the electrical signal to a numbing process and outputs it as a thickness detection value to a thickness display section (not shown).

The edge calculation means 15 includes an edge calculation unit 8 and a reference value setter 11. The edge calculation unit 8 receives a reference value signal for edge detection set by the reference value setter 11, and a detector. 3A, and when it is determined that it is the measurement end, a measurement end signal is output to the scanning range calculator 9 and the width calculator 10. Note that the method for setting the reference value signal will be reported later.

The scanning range calculation means 16 includes a scanning range calculation unit 9 and a deceleration amount setter 12. When the scanning range calculator 9 receives the measurement end signal, it temporarily stops the detection unit 14 and outputs a command to the drive stage 13 to scan in the reverse direction, and also calculates the accuracy of end detection and the stopping accuracy of the detection unit 14. In order to improve the speed, the position data of the measurement position detector 6 is constantly monitored, the deceleration position is determined based on the measurement position where the previous end was detected, and the deceleration position is determined by the detection unit 14 preset in the deceleration amount setting device 12. The scanning speed is decelerated by the amount of deceleration of the scanning speed. In addition,
The deceleration position determined from the measurement position where the end was detected and the deceleration amount is stored as the next deceleration position.

When the width calculator 10 receives the measurement end signal, it reads out the position data of the measurement position detector 6, calculates it, and displays it on a width display section (not shown).

Next, FIG. 3 shows a relationship diagram between measured thickness and detector output for edge detection. In the figure, the song HE is the object to be measured 1
This is an electrical signal output from the detector 3A depending on the thickness of the . The reference value signal for edge detection set in the reference value setter 11 is the same as that of the detector 3 when the object to be measured 1 is not present.
It is obtained by setting the output value of A at point C to 100% and calculating a predetermined value within the range of 95% to 99% of this 100% setting value, which corresponds to the electrical signal value at point D when detecting the edge. It is something to do.

In addition, in this example, the case where a radiation source is used as a radiation source and a radiation detector is used as a detector is explained, but it is also possible that the radiation source is an infrared light source and the detector is a photodetector. Don't wait for arguments.

(Effects of the Invention) As described above, according to the present invention, the measurement position detector provided in the detection unit and detecting the measurement position of the object to be measured;
an edge screening means for detecting the edge of the object to be measured based on the output of the detector; and calculating a scanning range of the detection section based on the output of the edge calculation means and the output of the measurement position detector. By providing a scanning range calculation means to calculate the thickness of the object to be measured, the problems of the prior art can be effectively solved. Since it is applied, it is possible to set the investigation range of the detection department online without causing an excessive increase in equipment.
Moreover, the width of the object to be measured can be measured at the same time as the thickness measurement, and the performance is improved and the handling operation is easy.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of the present invention, and FIG.
3 is a diagram showing the relationship between measured thickness and detector output for edge detection, and FIG. 4 is a schematic configuration diagram of a conventional thickness meter. 1... Object to be measured, 3A... Detector, 6... Measurement position detector, 7... Thickness calculator, 8... End calculator, 9... Scanning range calculator , 10...Width calculator, 11...Reference value setter, 12...Deceleration amount setter, 14...Detector, 15...End calculation means, 16...Scanning range calculation Means: 30...thickness gauge. Patent applicant Fuji Electric Co., Ltd.

Claims (1)

[Claims] 1) A detection unit including a radiation source provided on a frame and a detector provided opposite to the radiation source, and is transported in a direction substantially perpendicular to the frame. In a thickness meter that scans the detection section in the width direction of the object to be measured and measures the thickness of the object based on the output of the detection section, the detection section is provided with a measuring position of the object to be measured. a measurement position detector for detecting a measurement position detector; an edge calculation means for calculating an end of the object to be measured based on the output of the detector; scanning range calculation means for calculating the scanning range of the detection section. 2) In the thickness gauge according to claim 1, the edge calculation means receives the output of the detector and sets a reference value for detecting the edge of the object based on the output of the detector. the reference value setter, and an end calculator which receives the reference value output from the reference value setter and the output of the detector and calculates the end of the object to be measured. thickness gauge. 3) In the thickness gauge according to claim 1, the scanning range calculation means includes a deceleration amount setter that sets the amount of deceleration of the scanning speed of the detection section, and an output of the end calculation unit and measurement position detection. a scanning range calculator that receives a measurement position signal output from the detector, calculates the scanning range of the detection unit, and outputs a detection unit drive signal based on the calculation result of the scanning range and the deceleration amount to the detection unit drive means; A thickness gauge characterized by comprising: 4) In the thickness gauge according to claim 1 or 2, the thickness gauge is connected to the measurement position detector and the end calculation means, and is connected to the measurement position detector and the end calculation means to calculate the thickness of the measured object based on the measurement position signal and the calculation result of the end. A thickness gauge characterized by being equipped with a width calculator for calculating the width of an object.