JP2002148001A - Inspection apparatus for dial gage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inspection apparatus by which the position of the pointer of a dial gage is recognized as a high-accuracy image by performing a gray level processing operation, and by which the performance of the dial gage can be inspected efficiently. SOLUTION: A plurality of dial gages 1 are assembled on a turntable 14, and the dial gage 1 as an inspection object is arranged so as to face a cylindrical luminaire 29 and a camera 26. A motor 24 for raising and lowering on the side of a camera stand 21 and a fine-adjustment motor 27 are operated, and the focal distance of the camera 26 is adjusted with reference to the dial plate, the pointer or the like of the dial gage 1. By using the camera 26, the dial plate, the pointer or the like of the dial gage 1 is read out as a gage image. The gray level processing operation is executed with reference to the read-out gage image so as to be recognized as the high-accuracy image. According to the image, the performance of the dial gage 1 is inspected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dial gauge for measuring the thickness, surface roughness, etc. of various industrial materials and parts, which is preferably used for performing a performance inspection at the time of shipment or the like. It relates to an inspection device.

[0002]

2. Description of the Related Art Generally, a dial gauge is used for measuring dimensions, surface roughness and the like of industrial parts. When such a dial gauge is shipped as a product, it is obliged to perform a performance test determined by JIS B7503 or the like.

[0003] Also, when a product is inspected using a dial gauge, it is necessary to periodically calibrate the dial gauge. In this case, the performance inspection is performed as described above.

For this reason, various devices for automatically performing the performance test of the dial gauge have been proposed (for example, Japanese Patent Application Laid-Open No. 51-21846, Japanese Patent Application Laid-Open No.
0-89903).

In Japanese Patent Application Laid-Open No. 10-89903, a dial gauge is transported to an inspection stand by a robot hand, and a dial plate of the dial gauge attached to the inspection stand is photographed by a camera. There is described an automatic inspection apparatus configured to perform a performance inspection of a dial gauge by reading a pointer position of the dial gauge from the apparatus.

[0006]

By the way, in the above-described inspection apparatus according to the prior art, unless the expensive high-precision camera is used, the position of the pointer of the dial gauge can be captured as a more accurate and stable image. It is difficult, and there is a problem that the cost increases in practical use.

That is, a standard CCD camera has one pixel (1
Pixel) is about 0.1 mm square, so that it is not possible to capture the movement of a pointer smaller than 0.1 mm, for example, as an identifiable image, which is sufficient accuracy for inspecting the performance of the dial gauge. There is a problem that can not be secured.

Further, in the case of the prior art, the overall configuration of the inspection apparatus is enlarged, and peripheral devices such as a controller, an operation unit, and a display unit are dispersedly arranged. In addition, there is a problem that it is difficult to secure an installation space, and since the dial gauge is transported by using the robot hand, the transport position cannot be adjusted efficiently, resulting in poor workability.

Furthermore, the influence of disturbance light, the effect of specular reflection, and the like are easily applied to the dial gauge dial plate depending on the arrangement conditions of the lighting equipment, and the state of the image captured by the camera becomes unstable.
There is a problem that it is difficult to increase reliability.

The present invention has been made in view of the above-mentioned problems of the prior art. It is an object of the present invention to provide a method of performing a gradation process to obtain a pointer position of a dial gauge even when a standard CCD camera or the like is used as an image pickup means. The present invention is to provide a dial gauge inspection apparatus capable of taking in as a high-precision and stable image, and efficiently performing the performance inspection of the dial gauge at low cost.

Another object of the present invention is to reduce the size of the entire apparatus to increase the degree of freedom of an installation place, and to efficiently inspect a plurality of dial gauges, thereby improving workability. It is an object of the present invention to provide a dial gauge inspection device that can be used.

Another object of the present invention is to eliminate the influence of disturbance light and the effect of specular reflection by using a dome-shaped illumination or the like, and to reduce the influence of an image captured by an image pickup means such as a CCD camera. An object of the present invention is to provide a dial gauge inspection device capable of stabilizing a state and improving the reliability of the device.

[0013]

According to a first aspect of the present invention, there is provided a spindle having a spindle which is displaced in an axial direction, the position of a pointer which moves the displacement of the spindle along a dial. A dial gauge, a driving means for externally driving the spindle for axially displacing a spindle of the dial gauge, a displacement detecting means for detecting a displacement amount of the spindle and outputting a detection signal, An imager arranged to face the dial plate of the dial gauge and reading the position of the pointer with respect to the dial plate as an image, performing a shading process on the image read by the imager, and positioning the pointer with respect to the dial plate Image processing means for recognizing as a high-precision image subjected to shading, an image processing signal output from the image processing means, and an image processing signal output from the displacement detecting means. Based on the detection signal, it employs a dial gauge inspection apparatus by comparing the pointer position and the displacement of the spindle becomes constituted by a performance inspection means for inspecting the performance of the dial gauge of the dial gauge.

By adopting such a configuration, when the spindle of the dial gauge is displaced in the axial direction by the driving means, the pointer of the dial gauge moves along the dial, and the position of the pointer at this time is imaged by the imaging means. While reading as an image, the displacement detecting means can detect the displacement of the spindle. Further, the image processing means can perform, for example, an image of one pixel as a finer image by shading the image from the imaging means, and capture the position of the pointer with respect to the dial plate of the dial gauge as a high-precision image. Can be. The performance inspection means compares the pointer position based on the high-precision image with the displacement of the spindle by the displacement detection means, and can inspect the performance of the dial gauge with high accuracy based on the correspondence between the two.

According to the second aspect of the present invention, the performance inspection means determines whether or not the pointer position of the dial gauge matches the predetermined position of the dial based on the image processing signal output from the image processing means. And a signal output unit for outputting a drive signal to the driving unit for displacing the spindle while the pointer position determining unit determines that the pointers do not match, and a match determination is performed by the pointer position determining unit. When the detection signal output from the displacement detection means is read, the pass / fail determination means for determining whether or not the spindle conforms to the inspection standard by comparing the displacement amount of the spindle and the position of the graduation plate at this time, and It consists of.

Thus, the performance inspection means keeps outputting the drive signal from the signal output means to the drive means to displace the spindle until the pointer position of the dial gauge coincides with the predetermined target position of the dial. Thus, the pointer of the dial gauge is moved to the target position on the dial. Then, when the pointer coincides with the target position of the dial, the detection signal output from the displacement detecting means is read to check the spindle displacement at this time to the target position (scale value) of the dial. A pass / fail judgment is made as to whether or not the dial gauge conforms to the standard, and a performance test can be performed to determine whether or not the dial gauge is a non-defective product.

According to a third aspect of the present invention, there is provided a dial gauge having a spindle displaced in the axial direction, the dial gauge displaying the displacement of the spindle as a position of a pointer moving along the dial, and a plurality of dial gauges. Turntable rotating means for rotating the turntable so as to sequentially position each dial gauge at an inspection position, having a turntable held at intervals in a circumferential direction, and a dial table of the dial gauge positioned at the inspection position. A driving unit for driving the spindle from the outside to displace the spindle in the axial direction, a displacement detecting unit for detecting a displacement amount of the spindle by the driving unit, and outputting a detection signal; and The position of the hands with respect to the dial is arranged as an image with the dial gauge facing the dial. Imaging means for reading and reading, height adjustment means for adjusting the height position of the imaging means with respect to the dial gauge positioned at the inspection position, and the imaging means with respect to the dial gauge positioned at the inspection position. Focus adjustment means for performing focusing, and performs shading processing on an image read by the imaging means, and as a high-precision image subjected to shading processing, indicating that the position of the pointer matches the target scale position of the scale board. Image processing means for recognizing, performance inspection means for inspecting the performance of the dial gauge based on a pointer position coincidence signal output from the image processing means, and a plurality of pieces of operation information at the time of inspection of the dial gauge before inspection, An operation information display means for displaying during and after the inspection is adopted.

With this configuration, the inspection of a plurality of dial gauges can be automated, and the performance inspection of each dial gauge can be continuously performed. The operation information display means can display a plurality of pieces of operation information during the inspection of the dial gauge before, during, and after the inspection, so that the inspection of the plurality of dial gauges can be performed efficiently. In addition, the overall size of the apparatus can be reduced, the degree of freedom of the installation location can be increased, and workability over the entire inspection can be improved.

Further, according to the invention of claim 4, the turntable rotating means has a rotation source for rotating a rotation shaft provided at the center side of the turntable by a predetermined angle, and the turntable is provided together with a plurality of dial gauges. It is configured to be exchangeably attached to the rotating shaft.

Thus, when inspecting a plurality of dial gauges, the turntable can be sequentially rotated by the rotation source to a position where each dial gauge faces the image pickup means, and the performance inspection of each dial gauge is performed in a series of steps. Can be performed continuously.

According to the fifth aspect of the present invention, the operation information display means has an inspection mode setting section for setting the dial gauge inspection mode to be updatable. As a result, an inspection mode serving as an inspection procedure when inspecting the dial gauge can be newly registered in an updatable manner, and the inspection mode can be arbitrarily set. Further, for example, it is possible to easily cope with a change in the inspection procedure (inspection mode) according to the JIS standard.

On the other hand, according to the invention of claim 6, the dial gauge has a model number display section for displaying the model number and the scale of the product on the scale board, and the image processing means displays the image of the scale board and the model number display section. It is configured to read from the imaging unit, and the performance inspection unit is configured to determine the inspection mode of the dial gauge according to the images of the dial and the model number display unit by the image processing unit.

Thus, the dial gauge reads the image of the model number display section from the scale plate, and can inspect the dial gauge according to the read image in accordance with the inspection mode predetermined for each model number. Automation of processing can be promoted.

According to a seventh aspect of the present invention, there is provided a cylindrical member extending between the dial gauge and the image pickup means along the optical axis of the image pickup means to block external light. A tubular illuminator including a cover and a light source provided in the tubular cover and emitting light toward the dial plate of the dial gauge is arranged.

Thus, the scale of the dial gauge can be photographed by using the image pickup means in a state where external light is blocked, and noises and the like due to external illumination can be satisfactorily removed.

On the other hand, according to the invention of claim 8, the driving means has a motor provided at a position separated from the dial gauge and rotating in response to a driving signal, and a rod for displacing the spindle of the dial gauge in the axial direction. And a rod driving mechanism for driving the rod in the axial direction according to the rotation of the motor.

Thus, the rod can be displaced in the axial direction by using, for example, a stepping motor, and the pointer position of the dial gauge can be appropriately changed while driving the spindle following the displacement of the rod. .

According to the ninth aspect of the present invention, the performance inspection means controls the speed of the motor by slowing up and slowing down the rotation of the motor so that the hands sequentially reach the scale position predetermined by the model number of the dial gauge. ,
When the pointer approaches the target scale position, the spindle of the dial gauge is slightly displaced so that the center of the pointer reaches the center of the scale in accordance with high-precision image recognition by the image processing means.

Thus, for example, when the spindle is driven in accordance with the inspection mode predetermined by the JIS standard and the pointer is rotated, the spindle can be driven by repeating coarse feed and fine feed, and the spindle feed and the pointer can be performed. Can be efficiently performed in a short time.

Further, according to the tenth aspect of the present invention, the performance inspecting means determines the position of the pointer of the dial gauge by a high-precision image processing means so that the pointer coincides with a reference graduation position prior to the inspection of the dial gauge. The initial adjustment is performed according to the recognition.

Thus, when inspecting a plurality of dial gauges, the initial position adjustment of the hands at the start of each inspection, ie, the zero point adjustment, can be easily performed according to the high-precision image recognition by the image processing means.

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a dial gauge inspection apparatus according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. 1 to 23 show a first embodiment of the present invention.

In the figures, 1, 1,... Are dial gauges to be inspected, and the dial gauge 1 has a circular case body 2 and an inside of the case body 2 as shown in FIGS. , A disk-shaped scale plate 3, a long hand 5, a short hand 6 as a pointer for rotating around a needle shaft 4 along the scale plate 3, and a scale of the long hand 5 and the short hand 6. It is composed of a transparent cover 7 and the like provided on the case body 2 so as to cover it together with the board 3.

The dial gauge 1 has a case 2
A radially protruding cylindrical stem 8 is provided, in which a spindle 9 is mounted so as to be axially displaceable. And the dial gauge 1 has a spindle 9
Is displaced in the direction indicated by the arrow A1 in FIG. 3, the long hand 5 and the short hand 6 rotate clockwise following the displacement, and the scale 3
The displacement amount of the spindle 9 is displayed by the position of the long hand 5 and the short hand 6 with respect to.

In this case, the dial gauge 1 has a dial 3
Is divided into 100 scales, and one scale of which represents a length corresponding to 0.01 mm is exemplarily used. For this reason, when the displacement of the spindle 9 is, for example, 1 mm, the long hand 5 makes one rotation in the clockwise direction to reach the "0" position on the dial 3, and the short hand 6 is rotated to the "1" position. It is.

When the dial gauge 1 shown in FIG. 3 is in the state after the initial adjustment, the long hand 5 is rotated from the position of "0" on the dial 3 by almost three graduations.
The spindle 9 is displaced in the direction of arrow A1 by a dimension of, for example, about 0.03 mm. When the spindle 9 is displaced in the direction indicated by the arrow A2 in FIG. 3, the long hand 5 and the short hand 6 are rotated counterclockwise in accordance with the displacement.

Reference numeral 10 denotes a model number display section formed on the dial 3 of the dial gauge 1. The model number display section 10 displays a model number, a scale, a measurement range, and the like of the dial gauge 1 as a product. . In this case, depending on the display content of the model number display unit 10, one graduation of the graduation plate 3 is, for example, 0.01 m.
The information that the measurable range is 10 mm or the like is obtained corresponding to m. Then, a controller 33 to be described later
The inspection mode (inspection procedure) of the dial gauge 1 can be determined based on the image of the model number display unit 10 read from the camera 26 as described later.

Next, reference numeral 11 denotes a base of the inspection apparatus, and 12 denotes a length measuring unit installed on the base 11 via a stand 13. The length measuring unit 12 is separated upward and downward. 3
Brackets 12A, 12B, and 12C are provided. These brackets 12A, 12B, and 12C have a drive motor 17, a micrometer 18, and a linear scale 1 described later.
9 etc. are attached. And the length measurement unit 12
Constitutes a detecting device for detecting the amount of displacement of the spindle 9 by the linear scale 19.

Reference numeral 14 denotes a turntable as a gauge holder rotatably provided on the length measuring unit 12 via a column 14A. The turntable 14 is formed, for example, as a rigid disk, and has a center side. Are fixed to a support 14A as a rotation axis. Further, a plurality of mounting holes 14B, 14B,... Are formed on the outer peripheral side of the turntable 14 at regular intervals (for example, at intervals of 72 degrees) in the circumferential direction. The stem 8 is detachably attached.

Here, as shown in FIGS. 4 and 5, fixing screws 14 are provided on the turntable 14 at the positions of the mounting holes 14B.
C and a press pad 14D made of an elastic material such as rubber. When the stem 8 of the dial gauge 1 is inserted into the mounting hole 14B of the turntable 14, the fixing screw 14C is turned from the outside and the pressing pad 14 is turned.
D is pressed against the outer peripheral surface of the stem 8. Thus, the fixing screw 14C fixes the stem 8 to the mounting hole 14B in a retaining state and prevents the stem 8 from being damaged by the holding pad 14D.

Reference numeral 15 denotes a turning motor as a rotation source which constitutes a turntable rotating means together with the turntable 14. The turning motor 15 is a motor bracket 15A extending from the length measuring unit 12 to the outside of the support 14A in the radial direction.
To the support 14 via a power transmission gear 15B or the like.
A is rotated, thereby turning the turntable 14 together with the support 14A.

On the motor bracket 15A, there is provided a turning lock mechanism (not shown) for mechanically stopping the rotation of the turntable 14 by removably engaging with, for example, the power transmission gear 15B. I have. Then, the turning motor 15 is controlled in conjunction with the turning lock mechanism as described later, whereby each dial gauge 1 on the turntable 14 is moved by the spindle 9 to the rod end 1 described later.
8B are sequentially arranged at the inspection positions facing up and down.

Reference numeral 16 denotes a driving device as driving means provided in the length measuring unit 12. The driving device 16 includes a stepping motor 17 (hereinafter referred to as a driving motor 17) mounted on a bracket 12A of the length measuring unit 12. And a length measuring rod 18A attached to the bracket 12B of the length measuring unit 12 and axially displacing the spindle 9 of the dial gauge 1 in the axial direction. The length measuring rod 18A is driven in the axial direction according to the rotation of the drive motor 17. And a micrometer 18 as a rod driving mechanism for
The micrometer 18 converts the rotation of the drive motor 17 into an axial displacement of the length measuring rod 18A.

Here, the drive motor 17 is rotated with drive characteristics as shown in FIGS. 19 and 20 by a drive signal from a controller 33 described later, and is speed-controlled by slow-up and slow-down. At this time, the drive motor 17 is driven to rotate in accordance with the number of pulses of the drive signal, and the micrometer 18 moves up the length measuring rod 18A with a displacement corresponding to the rotation of the drive motor 17 (for example, a displacement of several μm). , Downward.

The length measuring rod 18A extends upward along a linear scale 19 described later, and the upper end thereof has a rod end 1 facing the spindle 9 of the dial gauge 1 above and below.
8B. The micrometer 18 is connected to the spindle 9 of the dial gauge 1 by the rod end 18B.
Is displaced in the axial direction (the directions indicated by arrows A1 and A2 in FIG. 3).

19 is a bracket 12 of the length measuring unit 12.
A linear scale as a displacement detecting means provided in A. The linear scale 19 detects an axial displacement of the length measuring rod 18A as a displacement of the spindle 9, and outputs a detection signal to the controller 33.

Reference numeral 20 denotes a lifting / lowering motor as a lifting / lowering actuator provided in the length measuring unit 12, and the lifting / lowering motor 20 is a bracket 12A, 1 of the length measuring unit 12.
Drive motor 17, micrometer 1 with 2B, 12C
8 and the linear scale 19 are moved up and down integrally in the vertical direction.

As a result, the elevating motor 20 is driven by the length measuring unit 12 to bring the rod end 18B of the micrometer 18 into contact with the spindle 9 of the dial gauge 1, for example.
The brackets 12A, 12B, 12C, etc. are raised upward, or they are lowered to the standby position shown in FIG.

In the case where initial adjustment of the dial gauge 1 and the like are performed prior to the inspection of the dial gauge 1, FIG.
In the initial position adjustment process described later, the length measurement unit 1
Drive bracket 17, micrometer 18, and linear scale 19 together with the second brackets 12A, 12B, 12C.
Is raised by the lifting motor 20 and thereafter the drive motor 17 is appropriately rotated minutely, whereby the dial gauge 1 is initially adjusted.

By performing the initial adjustment, the dial gauge 1 is adjusted so that the center of the long hand 5 is overlapped with the center of the position "0" of the dial 3 and
The short hand 6 is also adjusted so as to overlap the position of "0" on the scale 3, and in this state, an inspection process described later is favorably performed. The initial adjustment operation can be performed only by controlling the drive of the elevating motor 20.

When the turntable 14 is rotated after the inspection processing for the dial gauge 1 is completed,
Brackets 12A, 12B, 12C of length measuring unit 12
Are lowered by the elevating motor 20 to the standby position shown in FIGS. 1 and 2, for example, to separate the rod end 18B of the micrometer 18 from the spindle 9 of the dial gauge 1. In this state, the turntable 14 is intermittently rotated by a predetermined angle (for example, 72 degrees), and the next dial gauge 1 is arranged at the inspection position.

The elevating motor 20 may be configured to be manually operated, and the brackets 12A, 12B, 12B of the length measuring unit 12 are driven by a rotation source such as a stepping motor.
It is good also as composition which raises and lowers C etc. up and down.

Reference numeral 21 denotes a camera stand provided on the base 11 at a predetermined distance from the length measuring unit 12, and an elevating table 23 is mounted on the camera stand 21 via a column 22 which can move up and down. A guide rail 23 </ b> A is provided on the upper surface side of the elevating table 23. The guide rail 23A extends in parallel with the axis OO in order to move a camera 26 described later along an axis OO as an optical axis shown in FIG.

Reference numeral 24 denotes a height adjustment motor as height adjustment means provided on the camera stand 21. The height adjustment motor 24 moves the elevator 23 together with the support column 22 up and down. As a result, the camera 26 is arranged to face the scale 3 of the dial gauge 1 and the like, and as shown in FIG.
An adjustment operation of a height position arranged at a position coincident with the needle axis 4 of the dial gauge 1 on -O (optical axis) is performed.

The height adjusting motor 24 may also be configured to be manually operated, and may be configured to raise and lower the lift 23 together with the support 22 by a rotation source such as a stepping motor. is there.

Reference numeral 25 denotes a camera table movably provided on the guide rail 23A, and reference numeral 26 denotes a CCD camera (hereinafter, referred to as a camera 26) as an image pickup means provided on the elevating table 23 via the camera table 25. As the camera 26, for example, a standard CCD camera having one pixel of 0.11 mm (measured at 480 pixels with respect to 53 mm) is used, but the present invention is not limited to this, and other types of digital cameras can be used.

Reference numeral 27 denotes a fine adjustment motor as a focus adjustment means provided on the camera base 25. The fine adjustment motor 27
By slightly moving the camera base 25 along the guide rail 23A, the dial 3 and the long hand 5 of the dial gauge 1 are moved.
The fine adjustment of the focal length of the camera 26 with respect to the above.

The fine adjustment motor 27 may be configured to be manually operated, or may be configured to minutely move the camera base 25 along the guide rail 23A by a rotation source such as a stepping motor.

The camera 26 is connected to the dial gauge 1
When the focal length is adjusted with respect to the dial 3, the long hand 5, etc., the dial 3, the long hand 5, the short hand 6, etc. of the dial gauge 1 are read as an image.

Numeral 28 is a lighting fixture support bracket provided at the end of the lift 23, and 29 is a tubular lighting provided on the lift 23 via the support bracket 28. The tubular lighting 29 is Dial gauge 1 and camera 26 at inspection position
And a dome-shaped indirect lighting device, for example.

As shown in FIG. 6, the cylindrical illuminator 29 extends along the axis OO and has an open end 30 having a large diameter at one end.
The dome-shaped cover 30 has a small-diameter opening end 30 </ b> B at the other end, and a ring-shaped light source 31 disposed on the inner peripheral side of the dome-shaped cover 30.

Here, the dome-shaped cover 30 is arranged at a position where the large-diameter opening end 30A side is close to the transparent cover 7 of the dial gauge 1 and has a larger diameter than the transparent cover 7 and is opened. . An opening end 30 </ b> B on the small diameter side of the dome-shaped cover 30 is arranged apart from the camera 26, and has a larger diameter than the camera 26 and is open.

The cylindrical illuminator 29 reflects the light from the ring-shaped light source 31 on the inner surface of the dome-shaped cover 30 and irradiates the reflected light to the dial 3 of the dial gauge 1 as indirect illumination. It works.

Thus, the dome-shaped cover 30 irradiates the light from the light source 31 almost uniformly to the entire dial 3 of the dial gauge 1 in a state where the light from outside is blocked. As a result, the image of the dial gauge 1 by the camera 26 is
The long hand 5, the short hand 6, and each scale (for example, FIG.
8, the scale positions 3a, 3b, 3c, etc.)
In addition, no shadow is formed around the hands (the long hand 5 and the short hand 6), and an image obtained by embossing them is obtained.

Reference numeral 32 denotes a cylindrical cover provided between the camera 26 and the dome-shaped cover 30. The cylindrical cover 32 is
It is composed of a bellows-shaped cylindrical cover whose cover length is adjustable. The cylindrical cover 32 prevents the disturbance light from entering between the scale 3 of the dial gauge 1 and the camera 26 under any environment.
0 is shielded together with this, so that a stable image can be obtained from the camera 26.

The cylindrical cover 32 is formed to have a slightly larger diameter than the open end 30B of the tubular lighting device 29, and is easily attached to the edge of the open end 30B using a magic tape or the like. It can be easily removed.

Reference numeral 33 denotes a controller constituted by a microcomputer or the like and serving as a control unit of the inspection apparatus.
As shown in FIG. 7, the controller 33 has a linear scale 19, a camera 26, a keyboard 34 and a mouse 35 as input operation means connected to an input side, and a turning motor 15, a drive motor 17, and a Motor 2
0, a height adjustment motor 24, a fine adjustment motor 27, a display 36, a printer 37, and the like.

The controller 33 has a ROM, RA
M, storage unit 33A such as a hard disk, and signal conversion unit 33
B and the like, and the storage unit 33A has a dial gauge 1
The inspection mode (inspection procedure) predetermined according to the model number (model) or the scale interval and the measurement width, a counter C described later and a predetermined count value Ca (hereinafter, referred to as a predetermined value Ca) are stored in an updatable manner. In addition, an inspection processing program for the dial gauge 1 shown in FIGS. 10 to 17 and the like are stored.

The controller 33 has a function as an image processing means for recognizing a high-precision image by shading the image input from the camera 26, and a performance for inspecting the performance of the dial gauge 1 according to a predetermined inspection procedure. It has a function as an inspection means. The signal converter 33B is built in the controller 33, and converts an output signal from the linear scale 19 into a true value S according to the following equation (2).

On the other hand, a display 36 serving as operation information display means performs a screen display as an operation information display 38 as shown in FIG.
The operation information display 38 includes an image display section 39 of the dial gauge 1 to be inspected, information of the dial gauge 1 and an inspection standard display section 40, an inspection result display section 41, an error diagram 42, and the like. . Operation information display 3
8, an operation selection button 43 and a manual operation button 44 are arranged above the image display unit 39, and a height adjustment button 45, a focus adjustment button 46, and an inspection start button 47 are arranged below the image display unit 39. Are located.

The operation information display 38 on the display 36 displays the date, maker name, gauge number, gauge type, gauge model number, etc. of the inspection standard display section 40 in accordance with the input operation of the keyboard 34, the mouse 35 and the like. The items are appropriately changed, and the operation selection button 43, the manual operation button 44, the height adjustment button 45, the focus adjustment button 46, and the inspection start button 47 are similarly clicked with the mouse 35 or the like.

The image display section 39 can be used for confirming the alignment between the dial gauge 1 and the camera 26, as described later, and also for confirming the pointer and the scale position at the time of manual inspection. This makes it possible to efficiently perform all the operations required for the inspection and the alignment of the inspection object (the dial gauge 1) in accordance with the operation information display 38 on the display 36 without dispersing the operations. Confirmation can be easily performed.

Here, the image display section 39 is an image display window for displaying an image read by the camera 26. The image display unit 39 displays a horizontal and vertical reference line extending vertically and horizontally, and a reference line of a small circle centered at the intersection of the horizontal and vertical reference lines and a large circle representing the screen maximum display range. Fine adjustment of the dial surface position of dial gauge 1,
This can provide convenience for checking the scale, the position of the pointer, and the like at the time of manual inspection.

The information and inspection standard display section 40 displays the inspection standard, inspection date, maker name, type, model number, and serial number of the dial gauge 1 by input operation of the keyboard 34, the mouse 35 and the like. It can be selected as appropriate, newly input, or added, and these are displayed as illustrated in FIG.

Further, the inspection result display section 41 serves as a display column for judging the inspection and the inspection result, and displays an indicated value, a true value, and an error value as measurement information during the inspection, and displays the judgment result after the inspection. To display.

The error diagram 42 displays the status of the error at each measurement point described later as a line graph. Then, even during the performance test of the dial gauge 1, a graph display is displayed by the error diagram 42 at any time, and the test result display section 41 displays the judgment result along with the indicated value, the true value, and the error value.

The operation selection button 43 is configured as a function button, and includes, for example, the drive motor 17 and the elevation motor 2.
0, a manual adjustment button 43A that is clicked with the mouse 35 or the like when the height adjustment motor 24, the fine adjustment motor 27, or the like is arbitrarily driven as required, a standby position button 43B, and a contact position button. Unit 43C and a table rotation button unit 43D.

The standby position button section 43B is clicked with the mouse 35 or the like when the length measuring unit 12 is moved to the above-described standby position, whereby the elevating motor 20 is moved downward by a predetermined angle. Just rotated. Further, when the contact position button 43C is clicked with the mouse 35 or the like, the elevating motor 20 is driven by a predetermined angle in the ascending direction.
For example, the brackets 12A, 12B, 12C and the like of the length measuring unit 12 are raised upward so that the rod end 18B of the micrometer 18 contacts the spindle 9 of the dial gauge 1.

When the table rotation button 43D is clicked with the mouse 35 or the like, the turntable 14 is turned so that the dial gauges 1 on the turntable 14 are sequentially arranged at the inspection position facing the camera 26. The rotation of the turntable 14 is stopped by the rotation lock mechanism when the motor 15 is rotated by a substantially constant angle by the use of the motor 15 and reaches the inspection position.

The manual operation button 44 includes a mode setting button section 44A which is clicked with the mouse 35 or the like when performing a new setting of the inspection mode shown in FIG. 14, and a length measuring rod 18A of the micrometer 18 (dial gauge). The coarse adjustment buttons 44B and 44G, the fine adjustment buttons 44C and 44F, and the reading button 44D and the measurement start point button 44E, which are operated by the mouse 35 when moving the first spindle 9) up and down. Contains.

When the fine adjustment buttons 44C and 44F of the manual operation button 44 are operated, the drive motor 1
7 is minutely driven to minutely move the length measuring rod 18A up and down. In this case, when the fine adjustment button 44C is operated, the long hand 5 of the dial gauge 1 is moved clockwise, and when the fine adjustment button 44F is operated,
The long hand 5 of the dial gauge 1 is moved counterclockwise.

When the coarse adjustment buttons 44B and 44G of the manual operation button 44 are operated by the mouse 35, the drive motor 17 is continuously driven for the operation time, thereby greatly raising and lowering the length measuring rod 18A. Can be moved. When this operation is released, the drive motor 17 stops, and the length measuring rod 18A (spindle 9) stops.

In this case, when the coarse adjustment button 44B is operated, the long hand 5 of the dial gauge 1 is moved clockwise, and when the coarse adjustment button 44G is operated, the long hand 5 of the dial gauge 1 is rotated counterclockwise. Moved in the direction. When the read button section 44D is operated with the mouse 35, the measurement points in the new inspection mode are stored as described later.

On the other hand, the height adjustment button 45 is used to adjust the height by driving the height adjustment motor 24 of the camera stand 21, and the elevation button section 4 for moving the elevation table 23 up and down.
5A, descending button part 45B, and origin position button part 45C
And When the origin position button 45C is clicked with the mouse 35 or the like, the height adjustment motor 24 is locked at that position, and the height position of the elevator 23 at this time is stored as the adjustment position. .

Further, the focus adjustment button 46 is
The fine adjustment motor 27 drives the fine adjustment motor 27 to adjust the focal length of the camera 26. The reverse button 46A finely moves the camera base 25 in the backward direction, and the forward button part finely moves the camera base 25 in the forward direction. 46B and an origin position button 46C. When the origin position button 46C is clicked with the mouse 35 or the like, the fine adjustment motor 27 is locked, and the position of the camera table 25 at this time is stored as the focusing position.

Further, the inspection start button 47 is clicked with the mouse 35 or the like when the inspection of the dial gauge 1 is started. Thus, the automatic inspection of the dial gauge 1 is started as in step 10 in FIG.

Next, a result table 48 shown in FIG. 9 is obtained by printing the inspection result for the dial gauge 1 to be inspected by a printer 37 in a predetermined format, which is a JIS standard B described in the prior art. It is created in accordance with 7503 or the like.

Here, the pointing error is obtained for each measurement point by the following equation (2). The pointing error 1/2 rotation measurement range is defined by moving the long hand 5 of the dial gauge 1 1/2 from the initial position. It shows the measurement range up to rotation (rotation by 180 degrees).

The indication error one rotation measurement range indicates a measurement range for rotating the long hand 5 of the dial gauge 1 from the initial position by one rotation (rotation by 360 degrees).
The rotation measurement range indicates a measurement range from when the long hand 5 of the dial gauge 1 is rotated twice (by 720 degrees) from the initial position.

The adjacent error means that when the long hand 5 is rotated clockwise or counterclockwise and measurement is performed at each measurement point as described later, two minutes apart by 1/10 rotation.
It indicates the maximum value of the difference between the pointing errors at two measurement points.

The dial gauge inspection apparatus according to the present embodiment has the above-described configuration. Next, an inspection process for the dial gauge 1 by the controller 33 will be described with reference to FIGS.

First, in step 1 shown in FIG. 10, for example, a predetermined value Ca corresponding to the number of dial gauges 1 attached to the turntable 14 is set,
The pre-processing including the function check and calibration of the camera 26 and the like is executed.

In step 2, the turntable 14
The setting process of Steps 21 to 24 shown in FIG.
, And a plurality (for example, 5
), And the dial gauge 1 to be inspected first is arranged to face the cylindrical lighting device 29 and the camera 26 as illustrated in FIG.

Next, in step 3, the turntable 1
It is determined, for example, visually whether or not the dial gauge 1 attached to 4 is of the same type as the previous inspection. When it is determined "YES" in Step 3, the process proceeds to Step 10 to be described later, and the automatic inspection of the dial gauge 1 is started.

If "NO" is determined in the step 3, the process proceeds to a step 4 to determine whether or not to set a new inspection mode. Then, “YES” in step 4
When the determination is made, the process proceeds to step 5 and
The inspection mode new setting process shown in (1) is performed, and thereafter, the process proceeds to the automatic inspection after step 10.

On the other hand, if "NO" is determined in step 4, the dial gauge 1 is to be inspected according to the already set inspection mode. In order to perform the position alignment, steps 31 to 3 shown in FIG.
The camera position adjustment processing is performed according to step 5. Then, in the next step 7, the position of the camera 26 after the alignment is stored using, for example, origin position buttons 45C and 46C shown in FIG.

Next, in step 8, information identification processing of the gauge to be inspected is performed in accordance with steps 41 to 44 shown in FIG. 13 to be described later, and the model number or scale of the dial gauge 1 and the measurement range are input. Then, in the next step 9, an inspection mode corresponding to the model number (model) of the dial gauge 1 is determined based on the information inputted in the step 8, and the counter C is initialized (C = 1).

The inspection mode (inspection procedure) is determined in advance according to the above-mentioned JIS standard, and the storage unit 33A of the controller 33 stores a model number or scale interval for each dial gauge 1 to be inspected. A plurality of inspection modes corresponding to the measurement width are stored in advance as procedures.

Next, at step 10, the dial gauge 1
In order to start the automatic inspection, for example, the inspection start button 47 shown in FIG. Thus, in step 11, the initial position adjustment processing for the dial gauge 1 to be inspected is executed according to steps 71 to 77 shown in FIG. As a result, the dial gauge 1 to be inspected
Is adjusted so that the long hand 5 overlaps the position of "0" of the scale 3, and the short hand 6 is similarly adjusted to zero.

Next, at step 12, the controller 3
Based on the specific inspection mode read from the third storage unit 33A, a performance inspection process including a shading process is executed in accordance with steps 81 to 95 shown in FIGS.

Then, in the next step 13, it is determined whether or not the counter C has reached a predetermined value Ca (C = Ca).
The predetermined value Ca in this case is a count value corresponding to the number of dial gauges 1 attached to the turntable 14, whereby the processing of step 13 is performed by the turntable 14.
This is to determine whether or not the inspection has been completed for all the dial gauges 1 above.

Also, while the determination in step 13 is "NO", the process proceeds to step 14 where the length measuring unit 12 is lowered to the standby position shown in FIG. 2, and the turntable 14 is rotated in step 15 to perform the next inspection. Target dial gauge 1
At the inspection position shown in FIG. And step 1
In step 6, the counter C is incremented by "1" as in the following equation (1).

[0103]

[Equation 1] C ← C + 1

Thereafter, in order to automatically inspect the next dial gauge 1 to be inspected, the processing after the step 11 is continued, and the automatic inspection for each dial gauge 1 set on the turntable 14 is sequentially repeated. . If the determination is "YES" in step 13, the process proceeds to step 17 and lowers the length measuring unit 12 to the standby position shown in FIG.

Next, at step 18, the turntable 1
Post-processing such as removal of the dial 4 from the support 14A and removal of the inspected dial gauge 1 from the turntable 14 is performed, and the processing operation is completed. The next inspection process can be performed continuously by replacing each dial gauge 1 to be inspected for each turntable 14.

Next, with reference to FIG. 11, the process of installing the turntable 14 in step 2 will be specifically described.
, A plurality of dial gauges 1 to be inspected are sequentially mounted, and each dial gauge 1 is fixed using a fixing screw 14C shown in FIGS.

Then, in step 22, the turntable 14 to which each dial gauge 1 is attached is attached to the support 14A.
And the turntable 14 is fixed so as to rotate integrally with the column 14A.

Next, at step 23, the dial gauge 1 on the turntable 14 is arranged at the inspection position facing the camera 26 by clicking the table rotation button 43D shown in FIG. As described above, the turntable 14 is rotated by a substantially constant angle by the turning motor 15, and when the turntable 14 reaches the inspection position, the turntable 14 is stopped by the turning lock mechanism.

As a result, as shown in FIG. 2, the dial gauge 1 has the cylindrical illumination device 29 and the camera 26 opposed to each other. Then, after that, return in step 24,
The processing after step 3 shown in FIG. 10 is performed.

Next, the camera 2 in step 5 in FIG.
The alignment process of No. 6 will be specifically described with reference to FIG. 12. First, in step 31, the camera stand 21 is moved by the up button 45A and the down button 45B of the height adjustment button 45 shown in FIG. The height adjustment motor 24 is driven, and the elevation table 23 is moved up and down together with the camera table 25 to finely adjust the height position.

In step 32, the optical axis of the camera 26 is set on the axis OO as shown in FIG.
It is determined whether or not it matches the needle shaft 4 described above, and the process of step 31 is repeated while the determination is “NO”.

If "YES" is determined in the step 32, the process proceeds to a step 33 and the focus adjustment button 46
The fine adjustment motor 27 of the camera 26 is operated by the retreat button part 46A and the forward button part 46B, and the focal length of the camera 26 is finely adjusted with respect to the dial 3 and the long hand 5 of the dial gauge 1.

Then, in step 34, it is determined whether or not the focusing of the camera 26 has been completed. If "NO", the process of step 33 is repeated. If "YES" is determined in the step 34, the process returns to the step 35, and performs the processes from the step 6 onward in FIG.

Next, referring to FIG. 13, the process of identifying the information of the gauge to be inspected in step 9 will be specifically described. First, in step 41, the model number display section 10 of the dial gauge 1 to be inspected is displayed. The image is read as an image by the camera 26, the image is subjected to shading processing and character recognition processing, and the model number (model) or the
Determine the measurement width and the like.

In step 42, it is determined whether or not reading of the model number or reading of the graduation and the measurement width with respect to the dial gauge 1 to be inspected has been completed. If the determination is "NO", the model number cannot be read. In this case, or because the graduation and the measurement width could not be read, the process proceeds to the next step 43.

In step 43, the model number, graduation, and measurement width of the dial gauge 1 are input using the keyboard 34 or the mouse 35 to set the dial gauge 1 in a state where it can be identified as the information on the gauge to be inspected.

Further, if "YES" is determined in the step 42, it means that the model number (or the scale and the measuring width) of the dial gauge 1 can be automatically recognized in the process of the step 41. Return and FIG.
The process proceeds to step 9 and subsequent steps shown in FIG.

That is, in step 9, the inspection mode corresponding to the gauge to be inspected is determined in accordance with the information on the gauge to be inspected (model number or scale of dial gauge 1 and measurement width). Note that this inspection mode is determined in advance according to the JIS standard, and a plurality of sets of inspection modes corresponding to the model number (or the scale and the measurement width) are stored in the storage unit 33A of the controller 33 in advance.

Next, with reference to FIG. 14, a specific description will be given of the new inspection mode setting process in step 5 in FIG. 10. First, in step 51, the new inspection mode setting of the dial gauge 1 to be inspected is performed. It is determined whether or not to perform manually, and when it is determined to be “YES”, step 5 is performed.
2 and thereafter, for example, the operation selection button 4 shown in FIG.
3. The new inspection mode is set to be updatable using the manual operation button 44 or the like.

That is, in step 52, the mode setting button section 44A of the manual operation button 44 shown in FIG.
Click with etc. Thus, for example, the mode setting button unit 44A is in a shaded state (or in a color display state different from other button units), and it is possible to identify that a new inspection mode is being set.

Next, in step 53, in order to input the information on the gauge to be inspected, the model number, the scale, and the measurement width of the dial gauge 1 to be inspected are input using the keyboard 34 or the mouse 35. As a result, on the screen of the display 36 shown in FIG. 8, the input results of the gauge maker, the gauge number, the gauge type, the gauge model number, and the like are displayed on the inspection standard display section 40, and are stored identifiably as information on the gauge to be inspected. Things.

Next, when the process proceeds to step 54 and the manual adjustment button 43A of the operation selection button 43 is clicked, for example, the manual adjustment button 43A is shaded (or a color display state different from the other buttons), and 55,
An operation such as 56 is set to be executable.

Then, in the next step 55, in order to perform the camera positioning process, steps 31 to 34 in FIG.
Similarly, the height adjustment button 45 and the focus adjustment button 46 are clicked with the mouse 35, and the dial 3 of the dial gauge 1
The focal length of the camera 26 is adjusted with respect to the long hand 5 and the like.

Next, at step 56, the zero point adjustment of the dial gauge 1 is performed in substantially the same manner as the initial position adjustment processing shown in FIG. However, the initial position adjustment in step 56 is performed by the coarse adjustment buttons 44B and 4B of the manual operation button 44.
4G, the fine adjustment buttons 44C and 44F are clicked with the mouse 35, and the micrometer 1 is manually operated.
The length measuring rod 18A (the spindle 9 of the dial gauge 1) is moved up and down.

In this case, the image display unit 3 shown in FIG.
While looking at the image of the dial gauge 1 displayed on 9, for example, by clicking the fine adjustment button 44 C with the mouse 35,
The initial position is adjusted until the long hand 5 of the dial gauge 1 substantially coincides with the initial position (the position of "0" on the scale 3).

Note that the adjustment of the pointer position (long hand position) in this case does not always require accurate position adjustment, but is merely for inputting information necessary for new setting of the inspection mode. Even if there is some error, it can be automatically corrected by processing on a computer.

Then, when the long hand 5 of the dial gauge 1 substantially coincides with the position of "0" on the dial 3, step 5
7, when the measurement start point button 44E is clicked, a signal for recognizing the measurement start point is output in step 58, whereby the linear scale 19 shown in FIG.
The reading from is reset to zero.

Next, in step 59, the coarse adjustment buttons 44B and 44G and the fine adjustment buttons 44C and 44F of the manual operation button 44 are clicked with the mouse 35 in order to selectively designate a measurement point based on the new inspection mode. Then, the long hand 5 of the dial gauge 1 is moved to the position of the measurement point to be designated. In this case, the pointer position does not always require accurate position adjustment.

Then, when the long hand 5 of the dial gauge 1 substantially coincides with an arbitrary measurement point, the process proceeds to step 60 and clicks the read button section 44D, and the measurement point at this time becomes one measurement point in the new inspection mode. Is stored as

Next, in step 61, it is determined whether or not all the measurement points in the new inspection mode have been read, and the processing from step 59 onward is repeated while the determination is "NO". And
If "YES" is determined in the step 61, it means that all the measurement points in the new inspection mode have been read, so the process proceeds to the step 62, where the mode setting button 44A is clicked, and the mode setting button 44 in the step 52 is clicked.
Release the shaded state of A.

Then, in the next step 63, when the user clicks the standby position button portion 43B of the operation selection button 43, the lifting motor 20 is rotated by a predetermined angle in the descending direction, and the length measuring unit 12 is moved to the aforementioned position. Can be lowered to the standby position.

If the determination in step 51 is "NO", the flow proceeds to step 64 to create a new inspection mode in an existing format. Then, in the next step 65, the new inspection mode in steps 52 to 63 or the new inspection mode in step 64 is automatically registered, and the process returns to step 66 to perform the processing after step 10 shown in FIG.

Next, referring to FIG.
First, in step 71, the elevation motor 20 of the length measuring unit 12 is driven in the ascending direction as described above. Then, in the next step 72, the image of the dial gauge 1 is read, and the position of the long hand 5 is recognized as a pointer position.

Then, in step 73, it is automatically determined whether or not the position of the pointer of the dial gauge 1 (the position of the long hand 5) has changed from the previous image, and if "NO", it is determined in step 73. The processing after step 71 is performed.

[0135] If "YES" is determined in the step 73, the rod end 18B of the micrometer 18 shown in FIG. 2 comes into contact with the spindle 9 of the dial gauge 1 so that, for example, the long hand 5 starts to move. Since the determination can be made, the elevating motor 20 of the length measuring unit 12 is temporarily stopped, and the process proceeds to the next step 74.

In step 74, to adjust the initial position of the dial gauge 1, the image of the dial gauge 1 is read again, and the inspection start point position by character recognition processing or the like (for example, "0" of the scale 3 shown in FIG. 3). Scale position)
And the pointer position are recognized using the shading process described later.

Next, at step 75, dial gauge 1
It is determined whether or not the initial adjustment has been performed so that the long hand 5 coincides with the initial position (inspection start point position). In order to perform the fine adjustment process, the drive motor 17 on the micrometer 18 side is finely driven in the ascending direction.
4 and subsequent processes are performed.

If "YES" is determined in the step 75, the long hand 5 of the dial gauge 1 is initially adjusted so as to overlap the position of "0" of the scale 3, and the short hand 6 is also adjusted to the "0" of the scale 3. Since it has been adjusted so as to overlap the position of "0", the process returns to the step 77 and performs the processing of the step 12 and the subsequent steps shown in FIG. Note that this initial adjustment operation may be performed by appropriately rotating the elevating motor 20 minutely.

Next, with reference to FIGS. 16 and 17, the performance inspection processing in step 12 will be described in detail. In this case, according to the inspection mode (procedure) determined by the JIS standard, the inspection is performed in the order of forward narrow-range measurement and forward wide-range measurement in the forward direction from the start of the inspection, return wide-range measurement in the reverse direction, and return narrow-range measurement. Done.

During the "going" measurement, the long hand 5 is rotated only in the forward direction, and during the "return" measurement, the long hand 5 is rotated only in the reverse direction. Prevents the occurrence of measurement errors due to

Here, the definition of the narrow range measurement and the wide range measurement will be explained. The narrow range measurement is defined by one scale corresponding to the scale of the dial gauge 1 or one of the gauge hands (long hand 5).
The range measured by the needle feed at every 1/10 turn (36 degrees) with respect to the turn (360 degrees) is shown. In addition, the wide range measurement indicates a case where the pointer is fed over the narrow range described above.
For example, it indicates a range in which the measurement is performed every 周 turn or every turn of the gauge pointer.

These are based on those defined in JIS B7503 and the like. Here, as an example,
In the narrow range measurement, when the long hand 5 of the dial gauge 1 makes one or two rotations (rotation), measurement points are taken every 1/10 rotation (rotation). In addition, the wide-range measurement is performed by measuring points every 1/2 turn until the long hand 5 makes 3 to 5 turns, and by measuring points every 1 turn until the next long hand 5 makes 6 to 10 turns. Are taken as outgoing measurement points, that is, forward measurement points.

On the other hand, return measurement, which is measurement in the reverse direction,
In order to rotate the long hand 5 at the position of the tenth rotation in the counterclockwise direction (reverse direction), the drive motor 17 for moving the spindle 9 is rotated in the reverse direction, and the same as the measurement point traced in the forward (forward) measurement. It is assumed that the measurement points are traced in reverse order so as to be inspected sequentially.

Therefore, in step 81 shown in FIG.
First, it is determined whether or not the measurement is in the forward direction (outbound). Then, immediately after the start of the test, the measurement in the forward direction is performed first as described above, so that “YES” is determined in the step 81, and the process proceeds to the next step.

In step 82, it is determined whether or not the measurement is for a narrow range. If "YES", the process proceeds to step 83, and if "NO", the process proceeds to step 84. Then, as described in the above-described example, first, the coarse adjustment of the pointer in the narrow forward direction is performed in step 83. That is, in step 83, the drive motor 17 is driven based on the measurement points predetermined in the inspection mode, and the position of the long hand 5 is roughly adjusted.

In this case, as shown in FIG.
Taking the case of moving to the scale position 3a of the scale 3 as an example of the first measurement point, the long hand 5 is moved by coarse adjustment to a position close to the scale position 3a by the processing of step 83.

During the narrow-range measurement, the speed of the drive motor 17 is controlled so as to slow down and up at a speed lower than the maximum speed Vm as shown by a characteristic line 51 in FIG. The control according to the movement amount of the long hand 5 (spindle 9) is performed by coarse adjustment.

When performing a wide range measurement, the drive motor 17 is set to the maximum speed Vm as shown by the characteristic line 52 in FIG.
The speed is controlled by increasing the speed up by slow-up and decelerating by slowing down when approaching the measurement point. In this case, the control according to the moving amount of the long hand 5 (spindle 9) is performed by coarse adjustment. It is.

Next, at step 88 shown in FIG. 17, the scale plate 3 and the long hand 5 of the dial gauge 1 are
In addition to reading the short hand 6 and the like as a gauge image, executing the shading process on the read gauge image, for example, as shown in FIG. Recognize as an image.

Here, the upper grating 60, shown in FIG.
60,... Represent one pixel (pixel) of the image read by the camera 26, and its size is, for example, 0.11 mm (48 mm for 53 mm) when a standard CCD camera is used.
(Measured at 0 pixel).

On the other hand, by performing the shading process as described above, the sub-pixel which is further reduced to one-quarter or less (for example, about 1/10 to 1/100 sub-pixels) can be obtained. The pixels 61 can be recognized as images.

In this case, the first, second, and third
In the image, the sub-pixel 61 is divided into 1/4 pixel (0.
25 pixels), the above-mentioned graduation position 3a is represented by a graduation width Wa of 2.50 pixels, and the long hand 5 as a pointer has a pointer width W of 2.25 pixels.
s.

The first image shown in FIG. 21 corresponds to the rough adjustment in the step 83, and the long hand 5 as a pointer.
Represents one pixel (sub-pixel 61) for the scale position 3a.
(Corresponding to 4 times of the above) is confirmed.

For this reason, when it is determined in step 89 that the long hand position coincides, that is, whether the center of the long hand 5 coincides with the center of the graduation position 3a, it is determined that there is no coincidence, so that "NO" is determined. Then, in the next step 90, the long hand position fine adjustment processing is performed.

In this case, the drive motor 17 shown in FIG.
For example, one pulse corresponds to a small angle according to the drive signal of one subpixel 61 or less (one subpixel for two pulses or more).
, And returns to step 88 again to input the gauge image, and the shading process is performed as described above.

The image at this time is, for example, as shown in FIG.
It is confirmed that the long hand 5 approaches the scale position 3a by 0.5 pixels (corresponding to twice the sub-pixel 61) as shown in the second image shown in FIG. However, even in this case, since the long hand 5 does not completely overlap the scale position 3a,
In step 89, it is determined that they do not match.

For this reason, the process again proceeds to step 90, where the fine adjustment of the long hand 5 is performed. Then, the process returns to step 88, where the gauge image is input again, and the shading process is executed. And
At this time, as shown in the third image of FIG. 21, when the center of the long hand 5 comes to overlap with the center of the scale position 3a, a coincidence determination is made in step 89, and by determining "YES", the next step is performed. Move to 91.

In step 91, the displacement of the spindle 9 of the dial gauge 1 is read out from the linear scale 19 as a true value S, and the value of the graduation position 3a (hereinafter, referred to as the value S) is read.
The designated value Sx) is compared with the true value S, and an error value ΔS between the two is obtained as in the following equation (2).

[0159]

## EQU2 ## ΔS = S−Sx

The calculation result is displayed in an error diagram 42 as a graph display at any time like the operation information display 38 shown in FIG. 8, and the indicated value Sx and the true value S (displacement amount of the spindle 9) of the graduation position 3a are displayed. ) And the inspection result display unit 4
It is displayed in each item of the judgment display column of No. 1. During this time, the operation information display 38 displays the image of the dial gauge 1 on the image display unit 39 as needed, displays the data on the inspection result display unit 41, and displays the graph on the error diagram 42 as needed.

That is, the case where the scale position 3a shown in FIG. 18 is at a position (for example, equivalent to 0.10 mm) 10 scales clockwise away from the "0" position of the scale plate 3 is assumed. As an example, if the true value S, which is the displacement amount read from the linear scale 19, is a detection signal corresponding to 0.10 mm or a detection signal that falls within the allowable error range of the inspection standard, the inspection standard Will be satisfied.

However, when the true value S is not a detection signal corresponding to 0.10 mm and is out of the range of the allowable error, the inspection standard is not satisfied, so that it is determined to be rejected. .

Next, in step 92, it is determined whether or not the performance test of the dial gauge 1 has been performed over all the measurement points.
Returning to the previous (next) narrow range measurement, forward wide range measurement, reverse (return) wide range measurement,
The processing of step 83, 84, 86 or 87 and the processing of steps 88 to 92 are repeatedly performed in the order of the narrow range measurement in the reverse direction.

By the processing during this time, the processing from steps 81 to 92 is repeated for each measurement point as shown in the scale positions 3b, 3c,... Shown in FIG.
If it is determined to be "ES", the flow proceeds to the next step 93.

Then, at step 93, when the inspection processing over all the measurement points is completed, a pass / fail judgment of the dial gauge 1 is performed, and the result of the judgment is displayed on the display 36. That is, whether or not the dial gauge 1 to be inspected satisfies the inspection standard covering all the measurement points is displayed as a pass / fail judgment, and whether it is a pass or reject is clearly indicated on the screen of the display 36. .

Next, at step 94, the pass / fail judgment at step 93 and the error value ΔS at step 91 are made.
(Difference from the true value S for each measurement point) and the like are created as a grade table 48, and this is printed in a format as shown in FIG.
7 is printed. Then, the process returns in step 95, and continues the processing in step 13 and subsequent steps shown in FIG.

Thus, according to the present embodiment, when a gauge image is read from the camera 26, this image is shaded to reduce one pixel of the image by the camera 26 to, for example, about 1/4 ( For example, sub-pixels 61 and 6 that have been miniaturized to 1/4 to 1/10
.. Are recognized as images, the position of the long hand 5 with respect to the scale 3 (for example, the scale positions 3a, 3b, 3c,... Shown in FIG. 18) of the dial gauge 1 is captured as a high-precision image. be able to.

On the other hand, as shown in FIG. 22, for example, when only the black-and-white binarization processing is performed (the hand and scale gradation processing are performed at the same positions as the first, second, and third images shown in FIG. 21). ), The recognition accuracy of the image is limited to the size of one pixel or more by each grid 60 as in the first, second, and third images in FIG. Therefore, for example, the scale position 3a is represented by a scale width Wa 'of three pixels, and
The long hand 5 as a pointer is represented by a pointer width Ws' for two pixels.

In other words, in the case of the black-and-white binarization processing,
Since the precision of the image recognition cannot recognize a finer image as compared with the shading process, the image recognition is performed by rounding off one pixel or less.
The hand 5 is represented by a scale width Wa 'for pixels, and the long hand 5 is represented by a pointer width Ws' for two pixels.

As a result, in the first image shown in FIG. 22, the long hand 5 is displaced by one pixel with respect to the scale position 3a, and in the second image and the third image, the long hand 5 is positioned at the scale position 3a.
It will be confirmed as overlapping with a.

In other words, in the case of the binarization processing shown in FIG. 22, only the image rounded down to the range of one pixel is recognized at the time of inputting the image. Similarly to the case of the second and third images, even if the long hand 5 is finely adjusted and moved, in the case of the binarization processing, the second hand of FIG.
As in the case of the image and the third image, it can be recognized only as a state where the long hand 5 overlaps the scale position 3a.

For this reason, the second and third images shown in FIG. 22 are recognized as the same image and cannot be identified as different images. In the case of the binarization processing, the fine adjustment of the long hand position is not performed. It is not possible to do this in a sufficiently fine-grained manner. In the case of the binarization process, the matching recognition is terminated at the stage of the second image, and the third image is actually omitted.

Further, in the case of the binarization processing, when the recognition of the coincidence between the return and the return at the scale position 3a where the inspection position is the same is performed, as shown in the first and second images shown in FIG. In the matching inspection in the inspection of the return and the inspection of the return as in the first image, the second image or the third image shown in FIG. In this case, the position of the pointer 5 is differently recognized by one pixel (one pixel), and as described above, the position recognition error of one pixel, that is, 0.11 mm (measured at 480 pixels with respect to 53 mm) is recognized. Will happen.

On the other hand, in the present embodiment, the sub-pixels 61, 61,... Obtained by further reducing the size of one pixel by performing the gradation processing as described above can be recognized as an image. The position of the long hand 5 with respect to the graduation position 3a, etc. can be captured as a high-precision image. When the same deviation is observed in the gradation processing, the error returned from the third image shown in FIG. Since this does not occur, the position recognition error in the forward and backward directions is 1/4 pixel, which can be accommodated by a position recognition error of, for example, 0.0275 mm (measured at 480 pixels for 53 mm).

Further, in the shading processing, 1/10 to 1/10
Since it can have a resolution up to about 0 pixels, 1 /
With a resolution of 100 pixels, for example, 0.0011 mm
(Measured at 480 pixels for 53 mm), the position recognition error can be kept small.

Therefore, in this embodiment, the standard CCD is used.
Even when the camera 26 or the like is used, the fine adjustment of the long hand position can be performed sufficiently finely, and the pointer position by the long hand 5 of the dial gauge 1 is captured as a highly accurate and stable image. Can be efficiently performed at low cost.

By reading the model number display section 10 formed on the dial 3 of the dial gauge 1 with the camera 26, the inspection mode (procedure) of each product of the dial gauge 1 can be changed according to the image content of the model number display section 10. Since the configuration is determined, the inspection for each dial gauge 1 can be performed in accordance with a procedure predetermined for each model number, and the automation of the inspection process can be promoted.

Further, since a cylindrical illuminator 29 such as a dome type illumination and a cylindrical cover 32 are arranged between the dial gauge 1 on the turntable 14 and the camera 26, the cylindrical illuminator 29 is provided. The scale plate 3 of the dial gauge 1 can be photographed using the camera 26 in a state where external light is blocked by the dome-shaped cover 30 and the cylindrical cover 32, and noise and the like due to external illumination can be taken well. Can be excluded. As a result, it is possible to prevent the influence of disturbance light, the effect of specular reflection, and the like on the dial 3 of the dial gauge 1, stabilize the state of the image captured by the camera 26, and improve the reliability.

Further, a plurality of dial gauges 1, 1,... Are arranged at regular intervals in the circumferential direction of the turntable 14 by using a turntable 14 as an inspection table serving as a gauge holder.

Therefore, when inspecting a plurality of dial gauges 1, each time the inspection of one dial gauge 1 is completed, the turntable 14 is sequentially moved to a position where the next dial gauge 1 faces the camera 26. By rotating the dial gauge 1, the performance inspection of each dial gauge 1 can be continuously performed in a series of steps, and the efficiency of the inspection can be improved.

Further, on the screen of the display 36 serving as operation information display means, an inspection mode setting section comprising a manual operation button 44 and the like is provided so that the inspection mode can be arbitrarily set prior to the inspection of the dial gauge 1. Therefore, when the dial gauge 1 is inspected, the manual operation button 44 or the like is clicked to perform the new inspection mode setting processing shown in FIG. It can be performed arbitrarily. Further, for example, it is possible to easily cope with a change in the inspection mode according to the JIS standard.

Next, FIGS. 24 to 26 show a second embodiment of the present invention.
This embodiment is characterized in that a turning lock mechanism for positioning a turntable at an inspection position is constituted by an electromagnetic actuator. In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

In the figure, reference numeral 71 denotes a turntable employed in the present embodiment. The turntable 71 has substantially the same configuration as the turntable 14 described in the first embodiment, and has a support post at the center thereof. 14A, and each mounting hole 14B for mounting the dial gauge 1 and each fixing screw 14C are provided on the outer peripheral side.

However, the turntable 71 is formed as a stepped annular disk as shown in FIGS. 24 and 25, and an annular step 71A is integrally provided on the lower surface side. Also, on the outer peripheral surface side of the annular stepped portion 71A, for example, five V-shaped concave grooves 71B, 71B,... Are formed at regular intervals in the circumferential direction (for example, at intervals of 72 degrees). The concave groove 71B has a roller 7 of an electromagnetic actuator 72 described later.
2B is configured to be detachably engaged.

Then, the turntable 71 is
Each time the roller 72B of the electromagnetic actuator 72 selectively engages with any one of the grooves 71B among the grooves B, 71B,..., The turning (rotation) operation of the turntable 71 is stopped. As illustrated, the dial gauge 1 is positioned at the inspection position.

Reference numeral 72 denotes an electromagnetic actuator constituting a turning lock mechanism for stopping the turning operation of the turntable 71. The electromagnetic actuator is, for example, a rotary electromagnetic actuator provided on the motor bracket 15A shown in FIG. A roller 72B is rotatably supported at the tip of the rotating lever 72A.

The electromagnetic actuator 72 has the structure shown in FIG.
As shown in FIG. 6, when the roller 72B engages with the concave groove 71B, a stopper 72C is provided to stop the rotation lever 72A from rotating further in the direction of arrow C1. The stopper 72C has a rotation lever 72A. Is provided with a detection switch (not shown) for detecting the contact of the contact.

When the roller 72B engages with the concave groove 71B and the rotating lever 72A comes into contact with the stopper 72C as shown in FIG. 26, the detection switch is directed toward the controller 33 or the like illustrated in FIG. Then, a detection signal is output, and according to the detection signal, the power supply to the turning motor 15 is stopped and the rotation thereof is stopped.

Here, the electromagnetic actuator 72 has an urging spring (not shown) for urging the rotating lever 72A in the direction of arrow C1 in FIG. 26 and a urging spring for urging the rotating lever 72A against the urging spring. And an electromagnetic coil that rotates in the direction of arrow C2. When the power to the electromagnetic coil is released, the rotating lever 72A of the electromagnetic actuator 72 is rotated in the direction of arrow C1 in FIG. 71B is selectively engaged.

On the other hand, when the electromagnetic coil is energized from the outside, the electromagnetic actuator 72 rotates the rotating lever 72A in the direction of arrow C2 against the urging spring, thereby causing the roller 72B to rotate in the concave groove of the turntable 71. 71B, and forcibly releases the engagement between them. Then, at this stage, by starting the energization of the turning motor 15, the turntable 71 is rotated to the next gauge inspection position.

When energization of the electromagnetic actuator 72 is stopped in a state where the turntable 71 is rotated by a fixed angle (for example, an angle close to 72 degrees), the rotating lever 72A of the electromagnetic actuator 72 is moved by the urging spring. By being urged in the direction of arrow C1, the roller 72B is engaged with the concave groove 71B of the turntable 71, and the turning (rotating) operation of the turntable 71 is stopped again.

Thus, in the present embodiment configured as described above, substantially the same operation and effects as those of the first embodiment can be obtained. Since the turntable 71 is stopped at the inspection position using the lock mechanism, the turntable 71 can be accurately stopped at the inspection position.
Problems such as the turntable 71 inadvertently moving during the inspection of the dial gauge 1 can be eliminated.

In the above embodiment, Step 74 shown in FIG. 15 and Step 88 shown in FIG. 17 show specific examples of the image processing means which is a component of the present invention.
Step 12 shown in FIG. 16 and steps 81 to 95 shown in FIGS. 16 and 17 show specific examples of the performance inspection means.

Step 89 shows a concrete example of the pointer position judging means, step 90 is a concrete example of the signal output means, and steps 93 and 94 show concrete examples of the pass / fail judgment means.

On the other hand, in the above-described embodiment, the dial gauge 1 in which the long hand 5 and the short hand 6 are coaxially arranged on the needle shaft 4 has been described as an example. However, the present invention is not limited to this. The present invention can also be applied to a dial gauge of a type in which the short hand and the short hand are rotationally driven by different needle shafts.

In the above-described embodiment, the model number display section 10 formed on the dial 3 of the dial gauge 1 is
, The inspection procedure for each product of the dial gauge 1 is determined in accordance with the image content of the model number display section 10. For example, the operation selection button 4 shown in FIG.
3. A manual inspection method in a manual inspection mode is executed by using the manual operation button 44 and the like, and the inspection procedure can be stored while performing an operation on the operation information screen and image confirmation.

Further, a performance test can be executed by setting an operation according to the situation in advance. For example, if a rejection error occurs during the performance test, the test is terminated halfway and the next test is performed. May be automatically started. Further, it may be configured to include an operation setting means for setting whether to issue or not to issue a report at the end of all inspections.

In the above embodiment, FIGS. 19 and 2
0, as indicated by the characteristic lines 51 and 52, the drive motor 1
For example, a coarse adjustment for speed control is performed by slowing up and slowing down to a position close to the scale position 3a, and image processing after the coarse adjustment and fine movement (fine adjustment) of the pointer are alternately performed. Instead, the drive motor 17 is controlled by slowing up and slowing down to the measurement point of the dial gauge, and the drive characteristics are changed at the time of narrow range measurement and wide range measurement, respectively, in accordance with the movement amount of the spindle 9. Drive may be performed.

In this case, the fact that the pointer position of the dial gauge 1 is approaching the measurement point is confirmed by the drive motor 17.
During the slowdown control, when the pointer position and the scale position match, the drive motor 17 is immediately stopped to stop the displacement of the spindle 9.

[0200]

As described in detail above, according to the first aspect of the present invention, the driving means for axially displacing the spindle of the dial gauge, the displacement detecting means for detecting the displacement of the spindle, Imaging means for reading the position of the pointer with respect to the dial plate of the dial gauge as an image; image processing means for performing shading processing on the image read by the imaging means to recognize the position of the pointer as a high-precision image; Means for inspecting the performance of the dial gauge based on the image processing signal output from the means and the detection signal output from the displacement detecting means, so that a standard CCD camera or the like is used as the imaging means. Even in the case of using a dial gauge, the position of the pointer of the dial gauge can be recognized as a highly accurate and stable image by performing shading processing, It is possible to perform the test efficiently at a low cost, can facilitate the automation of inspection.

According to the second aspect of the present invention, since the performance inspection means is constituted by the pointer position determining means, the signal output means, and the pass / fail determination means, the pointer position of the dial gauge is predetermined. Until the position of the dial coincides with the position of the dial, the drive signal is continuously output from the signal output means to the driving means, and the pointer of the dial gauge is moved to the position of the dial by displacing the spindle. When they match, by reading the detection signal output from the displacement detecting means, it is determined whether the spindle displacement amount at this time conforms to the position of the graduation plate within the range of the inspection standard. A performance test can be performed to determine whether or not the dial gauge is good.

On the other hand, the invention according to claim 3 relates to a turntable rotating means for positioning a plurality of dial gauges at an inspection position, a driving means for driving a spindle of the dial gauge, a displacement detecting means for the spindle, and a scale plate. Imaging means for reading the position of the pointer as an image, height adjustment means for adjusting the height position of the imaging means, focus adjustment means for the imaging means, image processing means, performance inspection means for inspecting the performance of the dial gauge, and operation information With the configuration including the display means, the inspection for a plurality of dial gauges can be automated, and the performance inspection of each dial gauge can be continuously performed. Operation information can be displayed before, during and after the inspection, and can be displayed for multiple dial gauges. It can be inspected efficiently. In addition, the overall size of the apparatus can be reduced, the degree of freedom of the installation location can be increased, and workability over the entire inspection can be improved.

Further, according to the present invention, when inspecting a plurality of dial gauges, the turntable can be sequentially rotated by a rotation source to a position where each of the dial gauges faces the imaging means. Gauge performance testing can be performed continuously in a series of steps. When the inspection is completed, a plurality of dial gauges can be replaced for each turntable to prepare for the next inspection, and the efficiency of the performance inspection can be improved.

According to the fifth aspect of the present invention, the operation information display means has an inspection mode setting section for setting the inspection mode of the dial gauge to be updatable. It is possible to newly register an inspection mode, which is an inspection procedure, in an updatable manner, and it is possible to arbitrarily set an inspection mode. Also, for example, when the inspection procedure (inspection mode) is changed according to the JIS standard, it can be easily dealt with by operating the inspection mode setting unit.

On the other hand, according to the invention of claim 6, the dial gauge has a model number display section for displaying the model number and the scale of the product on the dial, and the image processing means includes the dial and the display of the model number display section. An image is read from the image pickup means, and the performance inspection means determines the inspection mode of the dial gauge according to the image of the dial and the model number display section by the image processing means. The inspection can be performed in accordance with an inspection mode predetermined for each model, and the automation of inspection processing can be promoted.

According to the seventh aspect of the present invention, between the dial gauge and the image pickup means, a cylindrical shape extends along the optical axis of the image pickup means and both ends are open to block external light. Since the cylindrical illuminator including the cylindrical cover and the light source provided in the cylindrical cover and irradiating light to the dial plate of the dial gauge is arranged, the external light is blocked. By using the imaging means, the dial plate of the dial gauge can be photographed, the influence of noise or the like due to external illumination can be removed, and a more stable image can be taken in from the imaging means.

On the other hand, the invention according to claim 8 is characterized in that the driving means for driving the spindle of the dial gauge comprises a motor rotating in accordance with a drive signal and a rod driven in the axial direction according to the rotation of the motor. Since it is composed of a rod drive mechanism that displaces the spindle of the dial gauge in the axial direction, when the rod is displaced in the axial direction using a stepping motor or the like, the spindle can be driven following the displacement of the rod, The inspection can be performed continuously while finely adjusting and changing the position of the pointer of the dial gauge.

According to the ninth aspect of the present invention, the performance inspecting means slows down the rotation of the motor by slowing down and rotating the motor so that the hands sequentially reach the scale positions predetermined by the model number of the dial gauge. Control, when the pointer approaches the target scale position, the spindle of the dial gauge is minutely displaced so that the center of the pointer reaches the center of the scale according to high-precision image recognition by image processing means. When the spindle is driven in accordance with the inspection procedure predetermined by the JIS standard, the spindle can be driven by repeating coarse feed and fine feed, and the spindle can be efficiently fed in a short time.

[0209] Further, according to the tenth aspect of the present invention, prior to the inspection of the dial gauge, the performance inspection means adjusts the pointer position of the dial gauge by the image processing means so that the pointer matches the reference graduation position. Since the initial adjustment is performed according to the precision image recognition, when inspecting a plurality of dial gauges, the initial position adjustment of the hands at the start of each inspection, that is, the zero point adjustment is easily performed according to the high precision image recognition by the image processing means. be able to.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing a dial gauge inspection device according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of the dial gauge inspection device shown in FIG.

FIG. 3 is an enlarged front view showing a dial gauge.

FIG. 4 is a plan view showing a turntable.

5 is a cross-sectional view showing, in an enlarged manner, a mounting hole, a fixing screw, and the like of the turntable from a direction indicated by an arrow VV in FIG.

FIG. 6 is a perspective view showing a positional relationship among a dial gauge, a cylindrical lighting device, and a camera.

FIG. 7 is a control block diagram of the dial gauge inspection device.

FIG. 8 is an explanatory diagram showing operation information displayed on a display.

FIG. 9 is an explanatory diagram showing a result table printed by a printer.

FIG. 10 is a flowchart showing a dial gauge inspection process by the controller.

FIG. 11 is a flowchart showing the turntable installation processing in FIG.

FIG. 12 is a flowchart illustrating the camera alignment processing in FIG.

FIG. 13 is a flowchart showing a specific example of the inspection gauge information identification processing in FIG. 10;

FIG. 14 is a flowchart showing a specific example of an inspection mode new setting process in FIG. 10;

FIG. 15 is a flowchart specifically illustrating an initial position adjustment process in FIG. 10;

FIG. 16 is a flowchart showing a specific example of the performance inspection process in FIG. 10;

FIG. 17 is a flowchart of the performance inspection process following FIG. 16;

FIG. 18 is an enlarged view of a main part of a dial gauge showing a dial, a long hand and the like.

FIG. 19 is a characteristic diagram illustrating drive characteristics of a drive motor during narrow range measurement.

FIG. 20 is a characteristic diagram showing drive characteristics of a drive motor at the time of wide range measurement.

FIG. 21 is an explanatory diagram showing an image in a state in which the position of the long hand with respect to the dial at the time of forward measurement is subjected to shading processing.

FIG. 22 is an explanatory diagram showing an image in a state where the position of the long hand with respect to the dial plate at the time of forward measurement is binarized.

FIG. 23 is an explanatory diagram showing an image in a state where the position of the long hand with respect to the dial plate at the time of reverse measurement is binarized.

FIG. 24 is a plan view showing a turntable used in the dial gauge inspection device according to the second embodiment.

FIG. 25 shows a turntable and a turning lock mechanism in FIG. 2;
FIG. 5 is a cross-sectional view enlarged from the direction of arrows XXV-XXV in FIG. 4.

FIG. 26 shows a turntable and a turning lock mechanism in FIG. 2;
It is sectional drawing expanded and shown from the arrow XXVI-XXVI direction in 5.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dial gauge 3 Scale plate 3a, 3b, 3c Scale position 4 Needle shaft 5 Long hand (pointer) 6 Short hand (pointer) 8 Stem 9 Spindle 10 Model number display section 11 Base 12 Length measuring unit 14, 71 Turntable 14A Column (rotation) Shaft) 14B mounting hole 15 turning motor (turntable rotating means) 16 driving device (driving means) 17 drive motor 18 micrometer (rod driving mechanism) 18A measuring rod (rod) 19 linear scale (displacement detecting means) 20 elevating Motor 21 Camera stand 23 Elevating table 24 Height adjusting motor (Height adjusting means) 26 Camera (Imaging means) 27 Fine adjusting motor (Focus adjusting means) 29 Cylindrical illuminator 30 Dome type cover (Cylindrical cover) 31 Light source 33 controller 36 display (operation information display means) 37 printer 43 operation selection button 44 manual operation button (inspection mode setting section)

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Seiichi Yokota 2-15-12 Tamagawa, Ota-ku, Tokyo Japan Radio Co., Ltd. F-term (reference) 2F061 AA02 EE31 SS02 VV51 5B057 AA01 BA02 CA08 CA12 CA16 CB08 CB12 CB16 CC01 CE11 DA07 DB02 DB09 DC02 5L096 AA06 BA03 CA02 CA14 FA66 FA69

Claims (10)

[Claims] 1. A dial gauge having an axially displaced spindle, and displaying a displacement of the spindle as a position of a pointer moving along a scale, and a dial gauge for displacing the spindle of the dial gauge in an axial direction. Driving means for driving a spindle from outside; displacement detecting means for detecting a displacement amount of the spindle and outputting a detection signal; and a position of the pointer with respect to the dial plate, which is disposed to face a dial plate of the dial gauge. Image processing means for reading the image as an image, image processing means for performing shading processing on the image read by the imaging means, and recognizing the position of the pointer with respect to the dial as a high-precision image subjected to shading processing, and the image processing means The dial gauge pointer position and spindle position are determined based on the image processing signal output from the The amount of displacement and compared to configure and dial gauge inspection apparatus comprising the a performance inspection means for inspecting the performance of the dial gauge. 2. A pointer position for judging whether or not a pointer position of the dial gauge matches a position of a predetermined dial based on an image processing signal output from the image processing unit. Determining means, signal output means for outputting a drive signal to the drive means for displacing the spindle while the hand position determining means determines that they do not match, The detection signal output from the displacement detection means is read, and the displacement amount of the spindle at this time is compared with the position of the graduation plate, and the pass / fail determination means is configured to determine whether or not the readout conforms to the inspection standard. The dial gauge inspection device according to claim 1, wherein 3. A dial gauge having a spindle which is displaced in the axial direction, and a dial gauge which displays the displacement of the spindle as a position of a pointer which moves along a dial, and wherein a plurality of the dial gauges are held at intervals in a circumferential direction. Turntable rotating means for rotating the turntable so as to sequentially position each dial gauge at the inspection position, and displacing the spindle of the dial gauge positioned at the inspection position in the axial direction. A driving unit for driving the spindle from outside, a displacement detecting unit for detecting a displacement amount of the spindle by the driving unit and outputting a detection signal, and facing a dial plate of the dial gauge positioned at the inspection position. Imaging means for reading the position of the hands with respect to the dial as an image, Height adjustment means for adjusting the height position of the imaging means with respect to the dial gauge positioned at the inspection position; and focus adjustment for focusing the imaging means with respect to the dial gauge positioned at the inspection position. Means for performing shading processing on the image read by the imaging means, and recognizing that the position of the pointer matches the target scale position of the scale board as a shading-processed high-precision image. A performance inspection unit for inspecting the performance of the dial gauge based on a pointer position coincidence signal output from the image processing unit; and displaying a plurality of pieces of operation information during the inspection of the dial gauge before, during, and after the inspection. Dial gauge inspection device comprising an operation information display means for performing the operation. 4. The turntable rotating means has a rotation source for rotating a rotation shaft provided at a center side of the turntable by a predetermined angle, and the turntable is provided together with a plurality of dial gauges with respect to the rotation shaft. The dial gauge inspection device according to claim 3, wherein the dial gauge inspection device is configured to be exchangeably mounted. 5. The dial gauge inspection apparatus according to claim 3, wherein the operation information display means has an inspection mode setting unit for setting an inspection mode of the dial gauge to be updatable. 6. A structure in which the dial gauge has a model number display unit for displaying a model number and a scale of a product on a dial, and the image processing means reads an image of the dial and the model number display from the image pickup means. 6. The dial gauge according to claim 1, wherein said performance inspection means determines an inspection mode of said dial gauge in accordance with an image of said dial and a model number display part by an image processing means. Inspection equipment. 7. A cylindrical cover extending between the dial gauge and the image pickup means along the optical axis of the image pickup means to block light from the outside, and having an open end at both ends; 7. The dial gauge according to claim 1, 2, 3, 4, 5, or 6, wherein a cylindrical illuminator comprising a light source provided in the cover and irradiating light toward the dial plate of the dial gauge is arranged. Inspection equipment. 8. The driving means includes a motor provided at a position separated from the dial gauge and rotating in response to a driving signal, and a rod for displacing a spindle of the dial gauge in an axial direction, according to the rotation of the motor. The dial gauge inspection device according to claim 1, 2, 3, 4, 5, 6, or 7, comprising a rod driving mechanism that drives the rod in the axial direction. 9. The performance inspection means performs speed control by slowing up and slowing down the rotation of the motor so that the hands sequentially reach a scale position predetermined by the model number of the dial gauge. 9. The dial gauge according to claim 8, wherein the spindle of the dial gauge is slightly displaced such that the center of the pointer reaches the center of the scale in accordance with high-precision image recognition by the image processing means when approaching the scale position. Inspection equipment. 10. The performance inspection means, before the inspection of the dial gauge, initially adjusts the pointer position of the dial gauge according to high-precision image recognition by the image processing means so that the pointer coincides with a reference scale position. 10. The dial gauge inspection apparatus according to claim 1, wherein the dial gauge inspection apparatus is configured to perform the above operation.