JPH03287016A - Inspection instrument for meter pointer being caught - Google Patents

Abstract

PURPOSE:To automatically inspect the pointer being caught by observing the motion of the pointer through a television camera and judging whether or not the pointer is caught using an image processor. CONSTITUTION:The rotation start point and rotational center position of the pointer 3 are registered by an inspection position setting means 12. Then the pointer is positioned at the rotation start point. Then the pointer is positioned nearby the center of the observation field of the television camera 6 by an XY moving mechanism 6. Then the reference point of the inspection pattern of the pointer is registered in an image processor 11 by the means 12. Then the processor 11 outputs a rotation start signal to a rotary table driving part 109 by a test signal generator 4. Then the processor 11 scans the inspection pattern and measures the difference of the pointer 3 from the reference point with the video signal of the video camera. At such a time, if the pointer is caught, the difference from the reference point varies large.

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to a meter pointer catch detection device that automatically determines whether a meter pointer is caught.

B1 Summary of the Invention The present invention provides a television camera that controls a test signal generator that drives a meter using a signal from an image processing device, an XY moving mechanism that moves the meter, and a television camera rotation drive device to enlarge the field of view for observation. The meter pointer is always placed in the center of the field of view, and the TV camera is rotated around the optical axis at the same speed as the pointer's rotation, so that the scanning direction of the TV camera relative to the pointer does not change. The image processing device measures the difference between the indicator needle and the reference point (pixel difference) on a preset inspection pattern using the video signal from the television camera, and determines whether this difference is within the preset standard range. This is to check how well the meter pointer is hooked.

C4 Conventional technology Conventionally, meter indicators, etc. were inspected as shown in Figure 4.
The meter (2) is connected to the test signal generator 4, and a person operates the test signal generator 4 to perform the test.

One of the contents of this inspection is to operate the test signal generator 4 to continuously apply a drive signal to the pointer 3, and check whether the pointer 3 moves smoothly at a constant speed in its entire range of motion or if it is caught in the middle. A visual inspection is carried out to see if there is a problem.

Problems that the D4 invention attempts to solve However, the above visual inspection has the following drawbacks.

Ta.

(]) Each inspector has different criteria for determining the smooth movement of the meter pointer, which tends to lead to product variations.

(2) If the pointer is moved at a high speed, the movement of the pointer cannot be accurately traced by visual inspection, resulting in poor inspection efficiency.

The present invention has been devised in view of the problems of visual inspection, and its purpose is to provide a meter pointer hooking inspection device that can automatically perform a pointer hooking inspection. It's about doing.

E, 7! Second Means for Solving the Problem In order to achieve the object described in 1-1, in the present invention, the meter pointer) hooking inspection device has a test signal generator that supplies a driving signal to the meter. , the pointer of the Vrlf meter, two television cameras that observe the movement with a field of view, and two J)
a rotary drive device that rotates the tech camera around its optical axis; an XY moving mechanism that moves the meter so that the entire meter indicator board can be covered in the pictorial field of view; and the television. an image processing device that performs one-dimensional measurement of the camera's bias signal output through binary image processing, and outputs a signal to the test signal generating device and the rotational drive device to cause the pointer and the camera to rotate at the same speed; This image processing device is equipped with an inspection point setting means for setting an inspection point, and the difference between the indicator needle and the reference point on the preset inspection pattern is determined by
l-, '1! Then, it is determined whether the difference between 1 and 2 exceeds the preset driving device.

F drawing A test signal generator provides a drive signal to the meter.

A television camera can observe the movement of the meter's fingers with an enlarged field of view. The XY movement mechanism matches the movement of the pointer! ' Move the meter in XY so that the pointer is always in the center of the camera's field of view. The rotational drive device rotates the television camera about its tip axis at the same speed as the rotational speed of the pointer so that the scanning direction relative to the pointer remains unchanged.

The image processing device issues the above control commands, processes the video signal output from the television camera into a binary image, measures the difference between the pointer and the reference point (pixel difference) on a preset inspection pattern, and It is determined whether the difference is within a preset standard driving device.

G Example Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows the configuration of a meter pointer catch inspection device. In FIG. 1, ■ is the meter to be inspected, 2 is its scale plate, and 3 is its pointer. 4 is a test signal generator that tests the meter; 5 is a television camera that observes the movement of the meter's pointer from above with an enlarged field of view; and 6 is a television camera that can cover the entire scale plate of the meter with its expanded field of view. 7 is the XYff movement mechanism that allows the meter to be moved as shown in the figure.
This is a Y positioning control device. 8 is a rotary drive device that rotates the television camera around its front axis; 9 is its rotary base; and 10 is its drive unit.

11 gives commands to the test signal generator 4, the XY positioning control device 7, and the rotary table drive unit 10, together with
An image processing device receives a signal from a television camera (ζ) (+ determines the degree of engagement of the pointer); 12 is an inspection point setting means for setting an inspection point, etc. to the image processing device 11;

Next, the processing and operation of this inspection device will be explained.

(1) Rotation start point of pointer 3, rotation center position (XY coordinates)
is registered by the inspection point setting means 12.

(2) The test signal generator outputs a signal that causes the pointer 3 to come to the rotation starting point, and the pointer 3 is positioned at the rotation starting point.

(3) i! of the TV camera 5 using the XY moving mechanism 6. !
Make sure that pointer 3 is near the center of the measuring field (Figure 3)
.

(4) As shown in FIG. 3, the inspection point setting means 12 instructs the image processing device 11 to
(straight line pattern or circular arc pattern, etc.) and the reference point x are registered.

(5) The image processing device 11 outputs an auto sweep start signal to the test signal generator 4, and at the same time registers the above (1) to the XYa position control unit 8 and starts rotating around the f rotation center. A circular arc contraction signal from a point (the moving speed is the same as the driving speed of the pointer 3) is output, and a rotation start signal is output to the rotary table drive unit 10.

(6) The image processing device 11 constantly scans the test pattern-L and measures the difference (pixel difference) between the pointer 3 and the reference point from the video signal of the video camera.

At this time, if the pointer is caught l) or does not occur, it will be closed.
1) If a problem occurs, the difference between the reference point and 5) will fluctuate greatly.

(7) When the measurement is completed, the image processing device 11 sets the reference point and 6)
It is determined whether the pixel difference is in the standard drive device or not, and if it is outside the standard range, it is detected whether it is caught in the movement of the pointer or not.
1 - Outputs a failure signal at the end.

H. Effects of the Invention Since the present invention is configured as described above, it produces the effects described below.

(1) Since the movement of the pointer is observed with a television camera and an image processing device is used to determine whether or not the pointer is caught, the inspection can be performed faster than a visual inspection. This method improves productivity.

(2) Meter inspection can be automated.

(3) Inspection quality is stable because individual differences among workers are not included.

[Brief explanation of drawings]

Figures 1 to 3 relate to embodiments of the present invention;
The figure is an explanatory diagram of the configuration of the inspection device, Figure 2 is a view taken in the direction of the arrow in Figure 1,
FIG. 3 is an explanatory diagram of the observation field of a television camera, and FIG. 4 is an explanatory diagram of the configuration of a conventional meter inspection device. 1. Meter, 3. Pointer, 4. Test signal generator, 5.
...TV camera, 6...XY movement mechanism, 8...rotary drive device, 11...image processing device, 12...inspection point setting means. 2 people outside Figure 3 (Observation field of view) A-sacred (Badain Figure 4)

Claims (1)

[Claims] (1) A test signal generator that supplies a drive signal to the meter; a television camera that observes the movement of the meter pointer with an enlarged field of view; and a rotational drive device that rotates the television camera around its optical axis. , an XY movement mechanism capable of moving the meter so as to cover the entire meter indicator board with the expanded field of view; and a test signal generating device that performs binary image processing and dimension measurement on the video signal output of the television camera. and an image processing device that outputs a signal for rotating the pointer and the television camera at the same speed to the rotary drive device, and an inspection point setting means for setting the inspection point to the image processing device, and according to a preset inspection pattern. 1. A meter pointer catch inspection device, characterized in that it measures the difference between the pointer and a reference point, and determines whether or not this difference is within a preset standard range.