JPH0419443Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dial gauge inspection device, and more particularly to a device for automatically inspecting a dial gauge.

Generally, many dial gauges are used in automobile parts manufacturing factories and the like. Since such a dial gauge may become distorted during use, it is necessary to regularly or irregularly inspect its accuracy to confirm its accuracy.

Conventionally, in such cases, the dial gauge to be inspected is set on the micrometer head, the dial gauge is moved by hand operation of the micrometer head, and the error between the micrometer head and the dial gauge is read visually. I'm inspecting my body.

However, such a testing method has the problem that it not only has poor workability, but also that the reliability of the test is influenced by individual differences and takes a lot of time.

The present invention was developed in view of these problems, and its purpose is to provide a dial gauge inspection device that can automatically inspect dial gauge loops in a short period of time. It is in.

In order to achieve this objective, the present invention moves the spindle of the dial gauge mechanically without manual operation, and uses a sensor to read the amount of rotation of the pointer of the dial gauge due to the amount of movement between two points. By determining the difference between the amount of movement of the spindle of the dial gauge between two points and the amount of rotation of the pointer between the two points, the loop between the spindle and the pointer is inspected.

The present invention will be described below with reference to embodiments shown in the drawings.

FIG. 1 is a system diagram showing a dial gauge inspection device which is an embodiment of the present invention, and FIG. 2 is a front view for explaining its operation.

In this embodiment, this dial gauge inspection device includes a holding part 2 that holds the spindle of the dial gauge 1 to be inspected vertically and downwardly (or with the scale plate horizontal), and a spindle 1a of the dial gauge 1 that is held vertically and downwardly (or with the scale plate horizontally). Output unit 3 capable of vertically moving at an appropriate speed and outputting the amount of movement as an electrical signal
, a reflective photo sensor 4 as a sensor for detecting that the pointer 1b of the dial gauge 1 has passed over the scale plate, and this sensor 4 is rotated forward by a certain angle after setting the starting point to detect the pointer 1b of the dial gauge 1. The detection position setting unit 5 rotates intermittently around the rotating shaft 1c, the movement amount data from the output unit 3 during the two time points when the sensor 4 detects the pointer 1b, and the intermittent rotation amount in the detection position setting unit 5. It is equipped with a microcomputer (hereinafter referred to as microcomputer) 6 that includes a calculation section for calculating the difference.

The output section 3 is equipped with a micrometer head 7, and this micrometer head 7 is connected to the holding section 2.
is installed directly below. This micrometer head 7 includes a spindle 7a, a sleeve 7b,
It is provided with a simple 7c and a knob 7d, and the knob 7d is connected to a direct current (DC) motor 8 and driven to rotate. A counter 9 connected to the microcomputer 6 is attached to the micrometer head 7, and the counter 9 converts the amount of movement of the spindle 7a, which corresponds to the measurement value of a normal micrometer, into an electrical signal and sends it to the microcomputer 6. It's starting to be input. The DC motor 8 is controlled by a controller 10 that receives commands from the microcomputer 6.

The reflective photosensor 4 is integrally equipped with a light emitting part and a light receiving part, and by detecting changes in the light receiving part when the pointer of the dial gauge 1 crosses the light emitting part, it is possible to detect the point at which the pointer 1b passes. is now being detected. This sensor 4 is connected to a microcomputer 6 so as to input a passing detection signal of the pointer 1b.

The detection position setting unit 5 includes a pulse motor 11, and when the pulse motor 11 is in a position in front of the holding unit 2, its rotation axis 11a can coincide with the pointer axis 1c of the dial gauge 1 held by the holding unit 2. It is set up like this. A rotary body 12 formed in the shape of a disk having approximately the same diameter as the dial gauge 1 is concentrically fixed to the tip of the motor shaft 11a, and the sensor 4 is attached to the tip of the pointer 1b. It is installed so that it faces you. Further, a rotary encoder 13 connected to a counter 14 is attached to the motor shaft 11a, and the counter 14 works together with the rotary encoder 13 to measure the amount of rotation of the motor shaft 11a, converts it into an electrical signal, and converts it into an electrical signal. 6. The pulse motor 11 is controlled by a second controller 15 that receives commands from the microcomputer 6.

The microcomputer 6 is connected to an input device 16 consisting of an operating point, a reading device, etc., an output device 17 consisting of a CRT, a printer, etc., and other peripheral devices (not shown), and the microcomputer 6 performs the functions described below. It is constructed for practical use.

Next, the method of use and effect will be explained.

The spindle of the dial gauge 1 to be scanned is set vertically and downwardly (or the scale plate is horizontal), and the holding part 2 is set and held in a predetermined posture.

With this setting, the measuring tip 1d at the tip of the spindle 1a of the dial gauge 1 comes into contact with the upper end of the spindle 7a of the micrometer head 7, the dial plate 1e of the dial gauge 1 directly faces the rotating body 12, and the pointer shaft 1c is connected to the motor. It coincides with the axis 11a.

When the proper setting is confirmed, the second controller 15 controls the pulse motor 1 according to a command from the microcomputer 6.
Rotate 1 to an appropriate angle. This rotation causes
Photo sensor 4 attached to rotating body 12
is an arbitrary initial detection position on the scale plate 1e of the dial gauge 1, for example, the position in FIG.
Moved to P ₀ . Note that before setting the initial detection position, the starting point is set on the scale plate, the device moves forward at a certain angle from there and stops, and that point becomes the initial detection position.

When the initial detection position P ₀ of the photosensor 4 is set, the first controller 1
0 rotates the DC motor 8. This rotation causes
The knob 7d of the micrometer head 7 is rotated, and the spindle 7a is raised in proportion to the amount of rotation. When the spindle 7a rises, the spindle 1a of the dial gauge 1 is lifted, and the pointer 1b is rotated in proportion to the amount of rise.

When the pointer 1b rotates and reaches the initial detection position _P0 , the photosensor 4 detects the pointer 1b and inputs the detection signal to the microcomputer 6.

When the pointer detection signal 1b is input from the photosensor 4, the microcomputer 6 controls the second controller 15.
The pulse motor 11 is rotated at a predetermined angle, for example, 72
Sends a command to rotate. Pulse motor 11
When starts rotating, the amount of rotation is measured by the rotary encoder 13 and the counter 14,
The measurement results are sent to the microcomputer 6. The microcomputer 6 controls the second controller 1 when the rotation amount value of the counter 14 reaches a desired set value of 72 degrees.
5 sends a confirmation signal to the pulse motor 11 to stop.
to stop accurately and precisely. That is, the amount of rotation of the pulse motor is feedback-controlled by a rotary encoder or the like.

Due to this rotation, the photosensor 4 attached to the rotating body 12 is moved from the initial detection position P ₀ to the first detection position P ₁ rotated by exactly 72 degrees.

Further, when a signal indicating that the photo sensor 4 has detected the pointer 1b at the initial detection position _{P0 is} input, the microcomputer 6 causes the counter 9 to start measuring the length by the micrometer head 7.

Micrometer head 7 is driven by DC motor 8.
The spindle 7a is raised, and the pointer 1b of the dial gauge 1, which rotates as the spindle 7a rises, moves to the first position.
When reaching the detection position P ₁ , the photo sensor 4 turns the pointer 1
b is detected and the detection signal is input to the microcomputer 6.

When the pointer detection signal at the first detection position _P1 is input, the microcomputer 6 reads the length measurement value from the counter 9. That is, the amount of rise of the spindle 7a required for the micrometer head 7 to rotate the pointer 1b from the initial detection position _P0 to the first detection position _P1 is read by the microcomputer 6.

Here, since the spindle 7a of the micrometer head 7 contacts and pushes up the spindle 1a of the dial gauge 1, the amount of movement of the latter 1a is equal to that of the front vehicle 7a. On the other hand, the amount of movement of the spindle 1a of the dial gauge 1 and the amount of rotation of the pointer 1b should be directly proportional. Therefore, since the pointer 1b has rotated 72 degrees from the initial detection position _P0 to the first detection position _P1 , the amount of rise of the micrometer head 7, that is, the value read by the microcomputer 6, is 72 degrees. The value must correspond to For example, since the display on the scale plate 1e corresponding to 72 degrees in the dial gauge 1 shown in FIG. 2 is 200 μm (one division is 10 μm), the reading value on the microcomputer 6 must be 200 μm. If this is large, the dial gauge 1 has a negative error, and if it is small, the dial gauge 1 has a positive error.

Then, the microcomputer 6 controls the spindle 1a to be set in advance according to the rotation amount of 72 degrees of the pointer 1b.
Ideal travel distance of 200 μm and micrometer head 7
The difference between the calculated value and the actual read value is calculated, and the solution is output to the output device 17 to be recorded.

When the pointer detection signal at the first detection position _P1 is input, the microcomputer 6 sends a command to the second controller 15 to further rotate the pulse motor 11 by 72 degrees. Along with this, the rotary encoder 13, counter 14, controller 15
Through feedback control such as the above, the photosensor 4 is rotated from the first detection position _P1 to the second detection position _P2 , which is advanced by exactly 72 degrees.

Further, the microcomputer 6 causes the counter 9 to measure the length by the micrometer head 7 from a position corresponding to the first position _P1 to a second position _P2 .

After that, the above operation is repeated, and the photo sensor 4
The error between adjacent detection positions is determined in the clockwise direction (forward movement) and counterclockwise direction (return movement) of the pointer 1b of the dial gauge 1.
By tabulating and analyzing the errors obtained in this manner, the test results for the dial gauge are determined.

In addition, in the explanation of the above action, the error was calculated for each length corresponding to 200 μm in dial gauge scale, but if you want to perform an even finer inspection,
For example, if you want to find the error for each length equivalent to 100 μm, the microcomputer 6 is operated by the input device 16, and the pulse motor 11 gives a command to the controller 15 to move the position of the photosensor 4 at intervals of 36 degrees. All you have to do is change part of the memory of the microcomputer 6.

By changing the memory in this way, the photo sensor 4 changes to the first detection position P ₁ and the second detection position P 1 at 36 degree intervals.
By setting P ₁ .

Further, since the error is determined by setting an opening angle corresponding to a predetermined length, there is no need to set the initial detection position of the photosensor to the zero point of the dial gauge.

According to this embodiment, the operation of the micrometer head to move the spindle of the dial gauge by a predetermined amount and the reading of the micrometer head and dial gauge are performed without human intervention. The problem of gender being influenced is resolved.

Once the dial gauge to be inspected is set in the holder, the inspection can be carried out without any other manual work, greatly improving work efficiency.

Since the photo sensor rotates around the extension line of the pointer shaft and sequentially changes the inspection position, the inspection length can be freely changed and adjusted, and the inspection accuracy can be freely selected as desired. Moreover, since a microcomputer is used, the accuracy can be easily selected by changing part of the memory using an operation console or the like.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and may be modified without departing from the gist thereof.
It goes without saying that various changes are possible.

As a structure for connecting the motor to the micrometer head, a connection structure as shown in FIG. 3 may be used. That is, a rotating body 18 is fixed to the rotating shaft of the motor 8, and a pair of guide pins 1 are provided at positions eccentric to the rotational axis of the rotating body 18.
9 and 19 are erected parallel to each other. The shaft 20 is attached to the knob 7d of the micrometer head 7.
is provided to protrude in the radial direction, and this shaft 20 is slidably inserted between both guide pins 19, 19. The rotation of the motor 8 is transmitted to the knob 7d of the micrometer head 7 via the rotating body 18, guide pin 19, and shaft 20.

According to this connection structure, it is possible to reduce the accuracy of axial alignment and also to easily perform axial alignment.

As explained above, according to the present invention, the accuracy of the dial gauge can be automatically inspected, so that workability and reliability can be improved.

[Brief explanation of the drawing]

Figure 1 is a system diagram showing one embodiment of the present invention;
The figure is a front view for explaining the action. FIG. 3 is a partial perspective view showing a specific example of a connection structure between a micrometer head and a motor. 1...Dial gauge, 1a...Spindle,
1b...Pointer, 1c...Pointer shaft, 2...Holding part,
3... Output section, 4... Photo sensor, 5... Detection position setting section, 6... Microcomputer (calculation section), 7... Micrometer head, 8... DC motor, 9...
Counter, 10...First controller, 11...
Pulse motor, 12... Rotating body, 13... Rotary encoder, 14... Counter, 15... Second controller, 18... Rotating body, 19... Guide pin, 20... Shaft.

Claims (1)

[Claims for Utility Model Registration] A holding part 2 that holds the dial gauge 1 that is the object to be inspected; an output part 3 that advances and retreats the spindle 1a of the dial gauge 1 and outputs the amount of movement; and the dial gauge 1. After setting the starting point Po on the scale plate 1e of the
A reflective photosensor 4 detects the point in time when the pointer 1b of the dial gauge 1 passes due to the movement of the spindle 1a. It is equipped with a detection position setting section 5 that rotates the pointer 1b from its position, and a calculation section 6 connected to the output section 3 and the reflective photosensor 4. It is configured to find the difference between the amount of movement by the output section 3 and the amount of movement by the detection position setting section 5 between two detected points, and furthermore, the output section 3 connects the micrometer head 7 and the micrometer head 7. A motor 8 that rotates a knob 7d of the head 7 and a micrometer head 7.
A counter 9 reads the amount of movement of the spindle 7d and outputs it as an electric signal, and the detection position setting section 5 holds a pulse motor 11 controlled by a controller 15 and the reflective photosensor 4. , this pulse motor 11
A dial gauge inspection characterized by comprising: a rotary body 12 rotated by a rotary encoder 12; a rotary encoder 13 and a counter 14 that measure the amount of rotation of the pulse motor 11 and feed back the measured value to the controller 15; Device.