JP4878921B2 - Device for confirming the position of plate material set on a processing machine - Google Patents

Description

The present invention relates to a plate material set position confirmation device for a processing machine for confirming whether or not the attachment position is normal when a thin plate material such as a printed circuit board is attached to the processing machine.

In order to divide a printed circuit board on which a large number of pattern circuits are printed on a single thin substrate (plate material), there is a processing machine that forms dividing grooves between the pattern circuits or cuts between the pattern circuits. . In this case, since the printed circuit board is formed with a large number of pattern circuits approaching one board, it is necessary to attach the printed circuit board to the processing machine with high accuracy when processing the printed circuit board. Conventionally, the end face of the printed circuit board is brought into contact with a ruler (stopper), which is clamped by a clamp, and the processing machine is operated to form or cut the dividing groove. In this case, if dust is present between the printed circuit board and the ruler, or if there is a protrusion on a part of the end surface of the printed circuit board, the printed circuit board will be inclined with respect to the ruler, requiring correction means. Or processing errors are likely to occur.
JP 2000-343313.

An object of this invention is to obtain the board | plate material set position confirmation apparatus to the processing machine which can prevent the process mistake of a board | plate material.

The present invention is configured as follows to achieve the above object. That is, in the invention according to claim 1, the plate material cut into a square shape is fed toward the ruler of the processing machine, the entire area of the feed-side end surface of the plate material is brought into contact with the ruler, and the ruler and the plate material are brought into contact with each other. An image processing unit for recognizing an image with a CCD camera and measuring the gap of the contact portion from the image; and a determination unit for determining whether the set position of the plate material is good or not from the measurement value of the image processing unit The image of the CCD camera is a grayscale image of brightness, and the image processing unit and the determination unit calculate a binarization threshold value from the grayscale image of the measurement target region, and at a predetermined X coordinate in the X axis direction where the ruler extends. The rising edge and the falling edge which are the intersection coordinates of the N-th order curve approximate value obtained from the luminance array in the plate material direction and the binarized threshold value are obtained from a ruler, and these edges are obtained for the X coordinate of the measurement target region. The rising edge And the falling edge are divided into a plurality of line segment groups, the distance between the approximate straight line and the edge obtained for each line segment group is evaluated, and a plurality of line segments are controlled. When integrated into a line group and combined into a single line group, the combined single line group is taken as the representative line segment. When not integrated into a single line group, the longest line segment is represented. Line segments with angles exceeding ± 3 degrees are not representative, and when there is no long line segment, the line segment closest to the ruler is the representative line segment, and the resulting rising edge representative line segment Calculate the distance between the line and the representative line segment of the falling edge, and if the maximum width between these lines is less than the specified value, calculate that there is no gap at the contact portion between the ruler and the plate material, and set the plate material setting position as normal. Judgment is made.

According to the first aspect of the present invention, the feeding-side end portion of the plate material abutted against the ruler is straightened by being clamped from above and below by the clamp device, and in this state, the abutting portion between the ruler and the plate material is imaged by a CCD camera Since it recognizes and measures the clearance gap of an applicable contact part, the quality determination of the set position of this board | plate material can be performed correctly. In addition, since the gap between the contact portions is calculated based on the brightness of the gray image of the CCD camera or the width of the high brightness portion, it is possible to easily and accurately determine the quality of the set position of the plate material.

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, FIG. 1 is a side view of a main part of a processing machine to which the present invention is applied, and FIG. 2 is a plan view of FIG.

1 to 3, reference numeral 1 denotes a processing machine for forming a split groove (V groove) on a printed circuit board (hereinafter referred to as “plate material”) W, and a pair of upper and lower thin disk-shaped rotary cutters rotated by a motor 2. 3. Conveyor 4 that feeds plate material W in the direction of rotary cutter 3, ruler 5 that contacts the forward end of plate material W fed by conveyor 4, chuck 6 that clamps the forward end of plate material W, and frame material W A clamp 7 that is fixed to the side, and a CCD camera 8 that recognizes an image of a contact portion between the plate member W and the ruler 5.

The pair of upper and lower rotary cutters 3 are arranged in the Y-axis direction (left and right in FIG. 1) and supported by the X-axis moving device 10, move and rotate in the approaching direction during processing, and the X-axis moving device 10. Is moved in the X-axis direction (left-right direction in FIG. 2), and the dividing grooves in the X-axis direction are formed on the upper and lower surfaces of the plate material W.

As shown in FIG. 2, the chucks 6 are arranged in parallel in the X-axis direction and supported by the Y-axis moving device 11 so that a maximum of six plate members W can be sandwiched at the same time. . Each chuck 6 clamps the forward end portion of the plate material W positioned by the ruler 5, moves the plate material W to a set Y-axis position via the Y-axis moving device 11 at the time of processing, and rotates the divided portion by the rotation. It faces the cutter 3 position.

The CCD camera 8 is supported on a movable table (not shown) parallel to the X-axis moving device 10 described above, and is intermittently moved in the X-axis direction by the movable table. As shown in FIG. The nine measurement points P1 to P9 in the X-axis direction of the contact portion between the plate member W and the ruler 5 except for the image are recognized. The recognized image is subjected to measurement processing by the image processing unit 15 to measure the gap between the contact portions, and the determination unit 16 determines the quality of the set position of the plate material W based on the measured value.

The image processing unit 15 and the determination unit 16 are as follows. First, the field of view of the CCD camera according to this example in the Y-axis direction (ruler-plate material direction) is about 10 mm, and the range in the Y-axis direction for measurement (measurement target area) is about 5 mm (FIG. 4).

The image of the CCD camera 8 is a grayscale image having a luminance of 0 to 255 (cd / m ³ ). When the measured total luminance is 70 (cd / m ³ ) or less, there is no gap at the contact portion between the plate material W and the ruler 5. And the setting position of the plate material W is determined to be normal.

A luminance histogram is created from the grayscale image of the measurement target region, and a binary threshold M is calculated for white and black from the histogram . Next, as shown in FIG. 5, the brightness of ruler 5 → plate material W, that is, Xi, Yj + 1 → Xi, Yj + n, is obtained in order, and an N-th order curve approximate value is obtained from the obtained brightness array of the Xi coordinates. The intersection coordinates (rising edge Yiu, falling edge Yid) with the binarization threshold M are obtained (FIG. 6) .

Find these edges for all X coordinates. However, it may be thinned out for speeding up. The rising edges (YIu to Ymu) are divided into about 100 line segment groups, and approximate straight lines are obtained for each of the line segment groups G1, G2,... (FIG. 7A). Next, the distance between the approximate straight line and the edge is evaluated for each line segment group G1, G2,..., And the line segment with a poor result is decomposed into G2a (FIG. 7B). It is evaluated whether the edge included in the decomposed group G2a is the same as the adjacent line segment group. Edges with good evaluation results are integrated G3 into adjacent line segment groups, and edges with poor evaluation results with the adjacent line segment groups are made into independent line segment groups (FIG. 7C). By repeating this, the divided large number of line segment groups are integrated into a plurality of controlled line segment groups.

Since the line segment groups of the rising edges (YIu to Ymu) are on the ruler side, in most cases, they are integrated into one line segment group. If not integrated into a single line segment group, the longest line segment is the representative.

Determining a line segment group which is controlled in the same manner as described above from the falling edge (YId~Y md). When there is no line segment group of the falling edge, it is determined that the plate material W does not exist. In addition, if there is a slit or notch in the falling edge, it cannot be integrated into one line segment group. Therefore, in order to remove the slit or notch, a line segment with an angle exceeding ± 3 degrees is not representative. In addition, the longest line segment is represented as the representative when it cannot be integrated into one line segment group, and the longest line segment is represented as the representative in order to measure the narrowest gap when there is no long line segment. To do.

Next, the line width between the representative line segment Lu of the rising edge (YIu to Ymu) and the representative line segment (Ld) of the falling edge (YId to Ymd) is calculated, and the maximum width between the lines is calculated as the light width, That is, the gap between the contact portions of the plate material W and the ruler 5 is set, and if the gap is within a specified value, it is determined that the set of the plate material W is normal, the processing machine 1 is operated, and the divided grooves are formed in the plate material W. Form. If the gap is greater than or equal to a specified value, it is determined that the set of the plate material W is defective, and the processing machine is deactivated.

It is a principal part side view of the processing machine with which this invention is applied. It is a top view of FIG. It is explanatory drawing which shows the measurement position of a CCD camera. It is explanatory drawing which shows the measurement object area | region of a CCD camera. It is explanatory drawing which shows the measurement object area | region of the contact part of the board | plate material of a CCD camera, and a ruler. It is the brightness | luminance data figure of the acquired Xi coordinate. It is process drawing which shows the process process of a line segment group.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Processing machine 2 Motor 3 Rotating cutter 4 Conveyor 5 Ruler 6 Chuck 7 Clamp 8 CCD camera 10 X-axis moving device 11 Y-axis moving device 15 Image processing part 16 Determination part W Plate material

Claims (1)

The plate material cut into a square is fed toward the ruler of the processing machine, the entire area of the feed-side end surface of the plate material is brought into contact with the ruler, and the contact portion between the ruler and the plate material is recognized by a CCD camera, an image processing unit for measuring processing gap of the contact portion from the image provided, a quality determination unit for determining a set position of the plate from the measured values of the image processing section is provided, of the CCD camera image of the luminance The image processing unit and the determination unit calculate a binarized threshold value from the grayscale image of the measurement target region, and obtain the grayscale image from the luminance array in the plate material direction from the ruler at a predetermined X coordinate in the X axis direction where the ruler extends. A rising edge and a falling edge, which are intersection coordinates of the approximate value of the Nth-order curve and the binarized threshold value, are obtained, and these edges are obtained with respect to the X coordinate of the measurement target region, and the rising edge and the falling edge are obtained. Each line segment is divided into a number of line segment groups, the distance between the approximate straight line and the edge obtained for each line segment group is evaluated, and the plurality of divided line segment groups are integrated into a plurality of controlled line segment groups. When integrated into one line segment group, the integrated line segment group becomes the representative line segment, and when not integrated into one line segment group, the longest line segment is set as the representative line segment, and the angle is ± If there is no long line segment, the line segment closest to the ruler side is taken as the representative line segment, and the resulting rising edge representative line segment and falling edge representative line segment are not represented. When the maximum width between these lines is less than the specified value, it is calculated that there is no gap in the contact portion between the ruler and the plate material, and the set position of the plate material is determined to be normal. A device for confirming the position of a plate set on a processing machine.

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