JPH0439014B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a surface roughness measuring device that measures the surface roughness of an object to be measured from the displacement of a stylus involved in the object.

[Background technology and its problems]

A stylus is brought into contact with the surface of the object to be measured, and while the two are moved relative to each other, the displacement of the stylus in a direction intersecting (approximately perpendicular to) the relative movement direction is converted into an electrical signal, and this electrical signal is processed in a predetermined manner to measure the surface of the object. Surface roughness measuring machines for measuring roughness are known.

The general structure of a conventional surface roughness measuring machine will be explained with reference to FIG. Conventional surface roughness measuring machines are
A main body case 101 having a built-in measuring circuit, etc., includes a display means 102 for displaying the measured values obtained by the measuring circuit, and an arm 10 that reciprocates in the axial direction by a driving means built in the main body case 101.
3 and this arm 10.
The cylindrical body 10 is attached to the tip of 3 via the height adjustment member 104.
5 is attached to the cylindrical body 105, and is provided with a detection means 108 consisting of a detection circuit 107 that converts the vertical displacement of a stylus 106, which is supported by the cylindrical body 105 so as to be swingable in the vertical direction, into an electric signal.

Therefore, by supporting the main body case 101 in an appropriate position, bringing the stylus 106 into contact with the surface of the object to be measured (not shown), and moving the arm 103 in its axial direction by the driving means, The stylus 106 is displaced in the vertical direction depending on the surface roughness of the object to be measured. Then, the detection means 1
08 converts the displacement of the stylus 106 into an electrical signal and outputs it to the measurement circuit. In the measurement circuit,
A predetermined calculation process or the like is performed to obtain a measured value, and this is displayed on the display means 102, for example, a digital display.

Such a conventional surface roughness measuring machine includes an arm 10 including a stylus 106 from a main body case 101.
3 protrudes, so it has the advantage of being able to measure the surface roughness of the inner surface of a hole with a relatively small inner diameter, but on the other hand,
I had the following problem.

First, since the part where the stylus 106 should come into contact and the part where the main body case 101 should be stably supported are separated, there is a restriction in use that measurement cannot be performed unless the object is a large object that has both parts. Ta.

Secondly, the first point is that although the surface roughness is specified in a predetermined unit length defined by JIS, in a measured object that has only that unit length, the main body case 101 This meant that it could not be measured unless a special pedestal was provided to stably support it, which had the disadvantage of extremely poor measurement efficiency. Furthermore, since a workpiece having only a unit length is to be measured, if a special pedestal is provided, the posture of use is significantly restricted.

Third, since the detection means 108 protrudes from the main body case 101, there is a high risk of damaging the stylus 106 and the like during use, transportation, and storage, and care must be taken in handling.

Fourth, since the stylus 106 and the driving means of the arm 103 are separated from each other, deformation errors are likely to occur in these parts, resulting in poor measurement accuracy, and the arm 103, the driving means, etc. must be made robust. Therefore, the overall size and weight are large.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a surface roughness measuring device that eliminates the disadvantages of the protruding stylus while maintaining the advantages of the protruding stylus. .

[Means and actions for solving problems]

Therefore, the configuration of the present invention includes a main body case having window holes on the side surface and the bottom surface, a first slider provided in the main body case so as to be reciprocating, and a drive means for reciprocating the first slider. a second slider provided in the main body case so as to be reciprocally movable in the same direction as the first slider; and an engagement for engaging the second slider at different relative positions with respect to the first slider. and a detection means that includes a stylus that engages with the object to be measured, and is swingably supported by the second slider so that the stylus protrudes from each of the window holes at each of the relative positions. It is characterized by

Therefore, by changing the engagement position of the second slider with respect to the first slider, it is possible to make the stylus protrude from the main body case or change its posture to a state where it is housed in the main body case.
It is possible to eliminate the disadvantages of the conventional stylus protrusion type roughness measuring machine while maintaining its advantages.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings. FIG. 1 shows a partially cut-away front view of the surface roughness measuring device of this embodiment, and FIG. 2 shows the main part thereof.

The surface roughness measuring machine can be roughly divided into a main body case 11, and first and second parts provided inside the main case 11 so as to be reciprocating in the width direction (left-right direction in FIG. 1). Sliders 21, 31
a driving means 41 for reciprocating the first slider 21 with a constant stroke; an engaging means 51 for engaging the second slider 31 at different relative positions with respect to the first slider 21; 31, and a lid device 71 that moves forward and backward in relation to the movement of the second slider 31.
and an arithmetic and control device 81 that drives the driving means 41 and processes the signal from the detecting means 61 according to the commanded parameters to determine the surface roughness of the object to be measured and display it on a display 82. , consists of.

The main body case 11 is formed in the shape of a vertically elongated flat rectangular parallelepiped box, and has windows 12 and 13 at the lower part of one side and closer to one side of the lower surface, respectively, and the display 82 is provided at the upper part of the front.

The first slider 21 has an inverted L shape when viewed from the front, and its horizontal portion 21A is connected to the second slider 3.
1, and the vertical portion 21B is slidably supported by two guide bars 22 provided in the main body case 11 facing in the width direction thereof. ing. Horizontal part 21A
On the other side, an engagement pin 23 that engages with the drive means 41 is vertically protruded. Vertical part 21
B is engaged with the other end of a tension spring 45, one end of which is fixed to one side wall of the main body case 11.
Therefore, the first slider 11 is constantly urged to the left in FIG. 1 by the action of the tension spring 45.

The driving means 41 includes a motor 42 fixed in the main body case 11, a gearbox 43 that decelerates the rotation of the motor 42, and a gearbox 43 that decelerates the rotation of the motor 42.
The engagement pin 2 is attached to the output shaft of
a cam 44 having a cam surface that reciprocates the first slider 21 with a constant stroke via the cam 44;
and the tension spring 45 that urges the first slider 21 in a direction in which the engagement pin 23 is always in contact with the cam surface of the cam 44.

The second slider 31 is slidably provided on the two guide bars 22 . The second slider 31 is integrally provided with an operating lever 34 protruding from the main body case 11 through a window 14 opened in the main body case 11 in parallel with the guide bar 22 on the front thereof, and also protrudes from the bottom surface of the second slider 31 . A pin 35 for operating the lid device 71 is provided in a protruding manner.

The engagement means 51 includes two engagement holes 52A and 52B provided on the upper surface of the second slider 31 at a predetermined distance apart from each other in the reciprocating direction thereof, and the first engagement hole 52B.
One end of the engaging pin 23 is on the upper surface of the slider 21.
a plate spring 53 fixed to the plate spring 53, and one of the engagement holes 52A, 52 protruding from the other end of the plate spring 53.
It consists of an engagement pin 54 that selectively engages with B.

The detection means 61 has the other end connected to the second slider 3.
1, and has one end extending toward the lower left in FIG. 1. Leaf spring 62
At the other end, a stylus 64 is attached perpendicularly to the leaf spring 63 via a thinner leaf spring 63, and a skid 65 that covers the leaf spring 63 and the stylus 64 is attached. Note that the stylus 64 is attached to the skid 65.
A hole 65A for protruding is formed.
In the middle of the leaf spring 63 is the arithmetic and control device 81 which converts the vertical displacement of the stylus 64 into an electrical signal.
A detector 66 such as a piezoelectric element is attached.

The lid device 71 has a base 7 inside the main body case 11.
Two guide bars 73 are provided which are slidably supported in the same direction as the guide bars 22 via the guide bars 73 and can protrude out of the main case 11 through the window holes 12 of the main case 11. One end of both guide bars 73 protects the skid 65 of the detection means 61 and has a second
A cover plate 74 is provided that closes the window hole 12 in relation to the movement of the slider 31. Furthermore, an engagement block 75 is fixed to the other ends of both guide bars 73. The engagement block 75 has an engagement groove 76 formed on its upper surface that engages with the engagement pin 35 of the second slider 31, and a groove 76 that engages with the engagement pin 35 of the second slider 31 on its lower surface. window hole 13
A cover plate 77 is attached to close the. The length of the engagement groove 76 is at least longer than the reciprocating stroke of the first and second sliders 21 and 31 by the driving means 41.

Next, the operation of this embodiment will be explained.

In the state shown in FIG. 1, the detection means 61 protrudes from the main body case 11, and is therefore used, for example, to measure the surface roughness of the inner surface of a hole in the object to be measured. First, the detection means 61 protruding from the main body case 11 is inserted into the hole of the object to be measured, and the stylus 64 is brought into contact with the next inner surface.

Here, when the motor 42 is driven, the cam 44 is rotated by the drive of the motor 42. Then, the first slider 21 is moved by a certain stroke to the right in FIG. 1 against the tension spring 45 via the engagement pin 23 in contact with the cam 44. at the same time,
Since the second slider 31 is engaged with the first slider 21 via the engagement means 51, the second slider 31 and the detection means 61 are also moved together with the first slider 21 by a fixed stroke. At this time, since the length of the engagement groove 76 of the engagement block 75 is longer than the stroke of the cam 44, the cover plate 74,
77 never moves.

When the detection means 61 moves, the stylus 64 in contact with the object to be measured is displaced up and down depending on the surface roughness of the object to be measured. Then, the displacement of the stylus 64 is converted into an electrical signal by the detector 66 and then sent to the arithmetic and control unit 81 . The arithmetic control device 81 is
A surface roughness value is determined based on the electrical signal from the detector 66 according to the commanded parameters, and the result is displayed on the display 82. Therefore, like the conventional stylus protruding type, it is possible to measure the surface roughness of the inner surface of a hole with a relatively small inner diameter.

On the other hand, when the operating lever 34 of the second slider 31 is pulled to the right in FIG.
is moved to the right in FIG. At this time, since the first slider 21 is engaged with the second slider 31 via the engagement means 51, it is moved together with the second slider 31 against the tension spring 45.

Eventually, as shown in FIG. 3, when the other end of the first slider 21 comes into contact with the other inner wall of the main body case 11,
Since the first slider 21 cannot move any further in the same direction, the engagement pin 5 of the engagement means 51
4 is displaced upward via the leaf spring 53 and disengaged from the engagement hole 52A of the first slider 21. Then, the first slider 21 moves to the left in FIG. 1 due to the tensile force of the tension spring 45, and the engagement pin 23
4, that is, the state shown in FIG.

Furthermore, when the operating lever 34 is pulled in the same direction, only the second slider 31 moves to the right in FIG.
It fits into the engagement hole 52B of the slider 31. In other words, the state shown in FIG. 5 is reached. In this state, the cover plate 77 moves back to open the window hole 13, while the detection means 61 is completely housed within the main body case 11 and protrudes from the window hole 13. Therefore, in this state, any object to be measured that is large enough to place the main body case 11 can be sufficiently measured. Note that at this time, the window hole 12 is closed by the cover plate 74.

Therefore, according to this embodiment, the first slider 2
By changing the engagement position of the second slider 31 with respect to the stylus 64 with respect to the main body case 11,
Since the stylus can be made to protrude or change its appearance to a state where it is housed in the main body case 11, while maintaining the advantages of the conventional stylus protruding type measuring device,
This drawback can be overcome.

In other words, the stylus 6 is
If the detecting means 61 including 4 is in a protruding position, the surface roughness inside the hole can be measured if the protruding part is inserted into the hole, thus maintaining the advantages of the conventional stylus protruding type roughness measuring machine. can.

On the other hand, if the detection means 61 including the stylus 64 is housed inside the main body case 11, as long as the object to be measured is of a size that allows the main body case 11 to be placed, it will be sufficient to use a pedestal etc. Can be measured. Moreover, the detection means 61 including the stylus 64
Since it does not protrude from the main body case 11, it has a small flat rectangular parallelepiped shape as a whole.
It is convenient to use, transport and store, and has the advantage of being extremely easy to handle. Furthermore, in this state, since the window hole 12 is closed by the cover plate 74, foreign substances such as dust and oil do not enter into the main body case 11 from this part, and the influence of the atmospheric condition is also prevented. Highly accurate measurements can be achieved.

Further, in a state where the main body case 11 is placed on a certain location of the object to be measured, the detection means 61 including the stylus 64 may be made to protrude from the main body case 11,
If it is housed in the main body case 11, different measurement parts of the object to be measured can be measured without moving the main body case 11.

In the above embodiment, the first slider 21 is slidably held by the second slider 31, but the first slider 21 may be held directly within the main body case 11.

Further, the drive means 41 for reciprocating the first slider 21 is not limited to the configuration of the above embodiment, and the detection means 61 including the stylus 64
Any device that can reciprocate with high precision may be used. For example, a feed screw shaft is provided parallel to the pair of guide bars 22, and a first
The same effect can be achieved by screwing together the slider 21 and rotating the feed screw shaft forward and backward by a motor or the like. However, if it is composed of the motor 42, cam 44, and spring 45 as in the above embodiment, the first slider 21 can always be reciprocated with a constant stroke.
Moreover, since the motor 42 only needs to rotate in one direction during its reciprocating motion, there is an advantage that the motor can be easily controlled. Note that the spring 45 does not need to be a tension spring, and may be a compression spring that presses and urges the first slider 21 in the direction in which the engagement pin 23 contacts the cam 44.

In addition, when changing the engagement position of the second slider 31 with respect to the first slider 21, the second
The operating lever 34 that is protruded from the slider 31 of the second slider 31 and protrudes outward from the window 14 of the main body case 11 is operated. A pinion, which is screwed into this rack, is rotatably supported by the main body case 11, and a knob or lever connected to the pinion is provided on the outside of the main body case 11, and the pinion can be adjusted by operating the knob or lever. The second slider 31 may be moved by rotating the pinion. In this way, it is not necessary to form the window 14 in the main body case 11, so that foreign matter can be prevented from entering into the main body case 11.

Further, the engaging means 51 is not limited to the structure of the above embodiment, and may have any structure as long as it can selectively change the engagement position of the second slider 31 with respect to the first slider 21. For example, the first slider 21 may be provided with a set screw for fixing the second slider 31 at an appropriate position on the first slider 21.

Further, the detector 66 used in the detection means 61 is not limited to the piezoelectric element described in the above embodiment.
A differential transformer etc. may also be used, in short, the stylus 6
Any device that can convert the vertical displacement of 4 into an electrical signal may be used.

In the above explanation, a so-called integrated roughness measuring machine was described in which the arithmetic and control device 81 and the display 82 were integrally attached to the main body case 11, but the arithmetic and control device 81 and the display 82 were built into a separate box. However, the present invention can also be applied to a so-called separate roughness measuring machine in which the box body and the main body case 11 are electrically connected via a cable.

〔Effect of the invention〕

As described above, according to the present invention, there is provided a surface roughness measuring device that can expand the measurement range by maintaining the advantages of the protruding stylus type while eliminating its disadvantages, and is also excellent in handling. can do.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view showing an embodiment of the present invention, Fig. 2 is a perspective view showing the main parts thereof, Figs. 3 to 5 are views showing the operating status, and Fig. 6 1 is a perspective view showing a conventional surface roughness measuring machine. 11... Main body case, 12, 13... Window, 21
...first slider, 31...second slider,
41... Drive means, 42... Motor, 44... Cam, 45... Spring, 51... Engagement means, 52A,
52B...Engagement hole, 53...Plate spring, 54...Engagement pin, 61...Detection means, 74, 77...Lid plate.

Claims (1)

[Scope of Claims] 1. A main body case having window holes on each of the side and lower surfaces, a first slider provided in the main body case so as to be able to reciprocate, and a drive means for reciprocating the first slider. , a second slider provided in the main body case so as to be able to reciprocate in the same direction as the first slider; and an engagement that engages the second slider at different relative positions with respect to the first slider. and a detection means including a stylus that engages with the object to be measured, and is swingably supported by the second slider so that the stylus protrudes from each of the window holes at each of the relative positions. A surface roughness measuring machine featuring: 2. According to claim 1, the first slider is held by a second slider so as to be slidable in the same direction as the reciprocating direction of the second slider. Measuring machine. 3. In claim 1 or 2, the driving means includes a motor, a cam that is rotated by the motor and reciprocates the first slider at a constant stroke, and a cam that moves the first slider with respect to the cam. A surface roughness measuring device comprising: a spring that biases a portion of the slider in a direction in which it is always in contact with the slider. 4. In any one of claims 1 to 3, the engagement means includes an engagement hole provided in the second slider at a predetermined distance in the reciprocating direction thereof, and 1. A surface roughness measuring device comprising: an engagement pin provided on one slider via a leaf spring and selectively engaged with any of the engagement holes. 5. In any one of claims 1 to 4, the movement of the main body case in connection with the movement of the second slider accompanying a change in the engagement position of the second slider with respect to the first slider. A surface roughness measuring device characterized by being provided with a cover plate that selectively closes window holes.