JPH052010U - measuring device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a measuring device which is easy to handle and measure, and which can measure the shake and eccentricity of an elastic object. [Structure] A measuring table 20 that rotates around an axis A is provided, and a light emitting section 28 that irradiates an object 40 placed on the measuring table 20 with a laser beam L and a light receiving section 29 that receives the laser beam L are connected. A light-emitting unit 28 and a light-receiving unit 29 are arranged to face each other at a position where the center line 13 is orthogonal to the axis A, and AD conversion means for analog-digital converting the voltage of the light-receiving unit 29 and outputting the converted voltage. A personal computer for calculating the shake or eccentricity of the object 40 based on the output signal of the AD converter is provided.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a measuring device for measuring shake or eccentricity of an object.

[0002]

[Prior Art]

 The following is a conventional measuring device of this type.

Three-dimensional measuring instrument. The probe is three-dimensionally moved by the XYZ table, and the probe is brought into contact with an object on the measuring table for measurement.

Projector. The light from the light source is projected onto the object through a reflecting mirror, and the shadow is projected onto the screen to measure the shape. The reflector is moved on the XY table.

[0005]

[Problems to be solved by the device]

 However, the above conventional example has the following problems.

(A) In the three-dimensional measuring device, the probe must be moved in a complicated manner, which requires a great measuring time and a great cost. In addition, if the object is elastic, such as beloose, the object is elastically deformed by the pressing load of the probe, which makes measurement difficult.

(B) Since the shape of the object is read numerically by the projector, it takes a lot of measurement time, and if an eccentricity or the like is to be measured, a jig for rotating the object must be prepared separately. The measurement efficiency is poor.

The present invention is intended to solve the above problems, and an object thereof is to provide a measuring device which is easy to handle and measure, and which can measure shake and eccentricity of an elastic object. I am trying.

[0009]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a measuring table that rotates about an axis, and has a light emitting part for irradiating an object placed on the measuring table with laser light and a light receiving part for receiving the laser light. A line is arranged so as to oppose a position orthogonal to the axis, and AD conversion means for analog-digital converting the voltage of the light-receiving portion and outputting the same, and a shake of the object based on an output signal of the AD conversion means. Alternatively, a processing means for calculating the eccentricity is provided.

[0010]

[Action]

 In this invention based on the above configuration, the laser light emitted from the light emitting portion is partially blocked by the rotating object. In the light receiving section, the voltage changes due to this interruption, and this change is converted into a digital signal by the AD conversion means and output. The processing means calculates the shake or eccentricity of the object based on this signal.

[0011]

【Example】

 Next, the present invention will be described based on illustrated embodiments. FIG. 1 is a front sectional view showing a first embodiment of the present invention. A stepping motor 3 is housed in the motor housing chamber 2 of the hollow frame 1 and is fixed to the frame 1 by a fixing bolt 4.

The stepping motor 3 has a motor shaft 5, and the motor shaft 5 is vertically arranged in the cylindrical portion 6 of the frame 1. A shaft 7 is provided above the motor shaft 5 on the same axis A. The motor shaft 5 and the shaft 7 are connected by a bellows coupling 8.

The bellows coupling 8 has an annular plate 10 fixed to the shaft 7 and the motor shaft 5 with a set screw 9, and a bellows 11 joining the plates 10 to each other.

The shaft 7 is inserted in the shaft hole 12 of the cylindrical portion 6 and is held by a pair of bearings 13 assembled in the shaft hole 12. Further, a ring-shaped bearing holder 14 is fixed concentrically with the bearing 13 by using a set screw 15, so that the bearing 13 does not fall out from the shaft hole 12.

A sleeve 16 is fitted on the shaft 7, and its upper and lower end surfaces are in contact with the end surface of the inner ring of the bearing 13. The large diameter portion 17 provided on the shaft 7 is in contact with the inner ring of the lower bearing 13 and the upper plate 10.

On the other hand, a disc-shaped rotary flange 18 is attached to the upper end of the shaft 7, and is fixed by tightening with a nut 19. A measuring table 20 is mounted on the rotary flange 18. A pin 21 is provided on the rotary flange 18, and the pin 21 is inserted into the hole 22 of the measuring table 20 so that the rotary flange 18 and the measuring table 20 rotate integrally.

On the upper end of the cylindrical portion 6 of the frame 1, a mounting table 23 having an outward flange shape is horizontally provided. The mounting table 23 is located at substantially the same height as or slightly above the upper end of the measuring table 20.

Non-contact laser sensors 24 and 25 are provided on the mounting table 23 so as to face each other with an axis A therebetween. The non-contact type laser sensors 24 and 25 are fixed with a set screw 43. A light emitting portion 28 and a light receiving portion 29 are separately provided on the facing end surfaces 26, 27 of the non-contact type laser sensors 24, 25. A center line B connecting the light emitting portion 28 and the light receiving portion 29 is orthogonal to the axis A.

FIG. 3A shows the end face 26 of the non-contact type laser sensor 24, and the light emitting portions 28 are vertically long and linearly arranged. Therefore, it goes without saying that the light receiving unit 29 also has a vertically long shape.

FIG. 2 is a block diagram showing a main circuit configuration of the present invention.

Reference numeral 30 denotes a personal computer as a processing unit, which has a stepping motor control unit 31 and an AD conversion unit 33 built therein. The stepping motor controller 31 is connected to the stepping motor 3. A stepping motor power source 32 is connected to the stepping motor control section 31. The laser emitting section 26 and the light receiving section 27 are connected to the AD converter 33. A laser power source 34 is connected to the AD conversion means 33.

Next, the operation of the above embodiment will be described. First, after fixing the cylindrical article 40 on the measurement table 20, the stepping motor power source 32 and the laser power source 34 are turned on, the personal computer 30 is operated, and the stepping motor 3 is operated via the stepping motor control section 31. Drive. Further, the light emitting section 26 emits a planar laser beam (longitudinal length) L 1.

The drive of the stepping motor 3 is transmitted to the measuring table 20 via the motor shaft 5, the bellows coupling 8, the shaft 7, and the rotary flange 18, and the measuring table 20 rotates in a predetermined direction. Vibrations of the stepping motor 3 are absorbed by the bellows coupling 8.

In this embodiment, the stepping motor 3 is configured to stop instantaneously every 18 degrees. Therefore, the article 40 stops 20 times during one rotation. Here, since a part of the laser light L is blocked by the article 40, the measured value at the light receiving unit 27, that is, the voltage changes at each stop position.

Then, the amount of voltage change (in mm) is analog-digital converted by the AD conversion means 33, and then transferred to the CPU 41. In order to avoid an error in the above measurement, the object 40 is rotated 2-3 times, the average value thereof is calculated by the CPU 41, and the shake of the inclined surface 42 is obtained. The measured value is displayed on a monitor (not shown) of the personal computer 30.

FIG. 4 shows a second embodiment. In this embodiment, the light emitting portion 28 is provided in a horizontally long shape as shown in FIG. Of course, the light receiving section 29 is also provided in the horizontally long shape. Others are the same as the first embodiment. The article 40 placed on the measurement table 20 has a large diameter portion 43, a medium diameter portion 44, and a small diameter portion 45.

In the second embodiment configured as described above, the laser light L is emitted horizontally, and the concentricity is obtained by the voltage fluctuation (maximum-minimum) blocked by the article 40. If you want to measure the large diameter part 43 and the medium diameter part 44 or the medium diameter part 44 and the small diameter part 45 at the same time, insert a spacer between the mounting table 23 and the non-contact type sensors 24 and 25 to adjust the height. However, the laser light L may be applied to two places.

FIG. 5 shows a third embodiment. In the third embodiment, the light emitting section 28 is composed of a vertically long light emitting section 28a and a horizontally long light emitting section 28b, as shown in FIG. The light receiving unit 29 has the same structure. With this configuration, the eccentricity and the shake of the object 40 can be measured at the same time.

As described above, in the present invention, since the optical measurement is performed by using the laser beam, the object is not brought into solid contact with the object. Therefore, even an elastic object can measure its eccentricity and runout. Further, since the apparatus itself is provided with the stepping motor 3, it is not necessary to separately prepare a jig, so that the handling is easy and the cost is reduced.

[0030]

[Effect of the device]

 As described above, in the present invention, since the optical measurement is based on the laser beam, the object is not touched by the solid. Therefore, even an elastic object can measure its eccentricity and runout. Further, since the measuring table rotates, there is no need to prepare a separate jig, and the handling is easy and the cost is low.

[Brief description of drawings]

FIG. 1 is a front sectional view showing the configuration of a first embodiment of the present invention.

FIG. 2 is a block diagram showing a main circuit groove of the first embodiment of the present invention.

3A, 3B, and 3C are side views showing a configuration example of a light emitting unit of the present invention.

FIG. 4 is a partial front sectional view showing a second embodiment of the present invention.

FIG. 5 is a partial front sectional view showing a third embodiment of the present invention.

[Explanation of symbols]

 20 Measuring Stand 28 Light Emitting Part 29 Light Receiving Part 40 Article L Laser Light A Axis Center B Centerline

Claims (1)

[Claims for utility model registration] Claims: 1. A measuring table that rotates about an axis is provided, and a light emitting section that irradiates an object placed on the measuring table with a laser beam, and a light receiving section that receives the laser beam. The light emitting portion and the light receiving portion are arranged so as to face each other at a position where a center line connecting between them is orthogonal to the axis, and AD conversion means for analog-digital converting the voltage of the light receiving portion to output the voltage and the AD conversion means. And a processing means for calculating the shake or eccentricity of the object based on the output signal of the means.