JP2006194692A - Measurement apparatus and measurement method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a measurement apparatus and a measurement method allowing to accurately measure the size between parts to be measured even when it is small with consideration given to the deflection amount of probes. <P>SOLUTION: The measurement apparatus comprises a case body, a pair of probes 51, 52 of which the distal end parts 511B, 521B are brought into contact with the parts to be measured 101, 102, respectively, and which can move toward and away from each other, a moving amount detection means for detecting the relative moving amount between proximal end parts 511C, 521C of the pair of probes 51, 52, and an arithmetic and control means for calculating the size between the parts to be measured 101, 102 on the basis of a detected value by the moving amount detection means. A detected value X between the parts to be measured 101, 102 on the basis of the detected value by the moving amount detection means is corrected using values corresponding to deflection amounts T1, T2 caused by contact of the probes 51, 52 with the parts to be measured 101, 102 through a preset formula by the arithmetic and control means, thereby calculating a true value Y of the size between the parts to be measured 101, 102. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a measuring apparatus and a measuring method. Specifically, the present invention relates to a measuring apparatus and a measuring method for measuring a dimension between measuring parts by a pair of measuring elements respectively brought into contact with both ends between the measuring parts.

  2. Description of the Related Art Conventionally, in various product manufacturing sites and the like, measuring devices using the measurement principle of a dial gauge are used to measure dimensions between measurement sites such as gaps, groove widths, and pipe diameters (for example, patents). Literature 1 and Patent literature 2). The measuring device of Patent Document 1 includes a pair of arms that are rotatably provided along an inner peripheral surface of a pipe. A tip-shaped probe is attached to the tip of these arms with a pin so that it contacts the inner surface of the pipe, and the dimensions between the measurement sites are measured by rotating the probe on the inner surface of the pipe. It is supposed to be.

  On the other hand, the measuring apparatus of Patent Document 2 includes a conical measuring element inserted between measurement sites at the tip of a spindle, and the ratio of the diameter of the measuring element in the conical shape to the diameter and height is set in advance as a constant. Is set. The stem is provided with a reference piece movable in the axial direction of the spindle. At the time of measurement initialization, the tip of the reference piece and the conical bottom surface of the measuring piece are made to coincide with each other, and in measuring, the reference piece is adjacent to the groove with the measuring piece being in light contact with the inner peripheral surface of the groove. Push down until it touches the flat surface. At this time, the width of the groove is calculated based on the amount of movement of the spindle that has moved upward and the set constant.

JP-A-8-136201 ([0007], [0008], FIGS. 1 and 2) JP-A-7-113603 ([0014], [0015], FIGS. 1 and 3)

With respect to such a measuring apparatus, in recent years, the dimension between the measurement parts of the object to be measured has been reduced. For example, in the automobile industry, the gap dimension of the assembly part between the body of the automobile and the lamp has become very narrow, and it is necessary to measure the gap dimension to control the quality.
However, in order to measure the size of small gaps, it is difficult to ensure the strength of the measuring element if the size is reduced according to the dimension between the measuring parts, such as making the measuring element thin or thin. The amount of deflection of the child increases, and this deflection greatly affects the accuracy of the measurement. For this reason, it is necessary to separately calculate the deflection amount of the probe and correct the actual measurement value. However, this calculation takes a lot of time and effort. Also, because the probe is deflected, master measurement work for presetting is extremely difficult, and the work of measuring the groove width of the master gauge varies depending on the level of proficiency, so there is a risk that the reliability of the preset may be lacking. .
At present, there is no measuring device that can measure a small gap between the body of a car and a lamp, and the amount of deflection of the measuring element is not considered. However, no consideration is given to deflection.

  Here, an object of the present invention is to provide a measuring apparatus and a measuring method capable of accurately measuring the dimension even when the dimension between the measurement parts is small in consideration of the deflection amount of the measuring element.

  The measuring device according to the present invention includes a pair of measuring elements that are in contact with and separated from the case body, both ends between the measurement parts of the object to be measured, and a relative distance between the base ends of the pair of measuring elements. A measuring apparatus comprising: a moving amount detecting unit that detects a moving amount; and an arithmetic control unit that calculates a dimension between the measurement parts based on a detection value by the moving amount detecting unit, The calculation control means extends from the proximal end to the distal end, and the calculation control means calculates the measurement site based on a preset calculation formula based on the amount of deflection caused by contact of the probe with the measurement site and the detection value. It is characterized by calculating a dimension between them.

  According to the present invention, since the actual measurement value is corrected according to the deflection amount of the probe by the calculation control means, and the true measurement value is calculated, the dimension between the measurement parts is small, and the actual measurement value due to the deflection of the probe Even when the influence on the measurement is large, it is possible to measure an accurate dimension between measurement sites. As a result, it is possible to greatly improve the measurement accuracy when the measuring element is made sufficiently small according to the dimension between the measurement parts, such as thin or thin, and it is possible to cope with the measurement of a very small gap. In addition, it is possible to save time for separately calculating the deflection amount of the probe based on the conversion table and shorten the time for the measurement work.

Next, in the measurement apparatus of the present invention, the true value of the dimension between the measurement parts is Y, the detection value by the movement amount detection means is X, and the contact point of the measurement part from the contact position of the measurement part L is the length to the base end, E is the elastic modulus of the probe, I is the section modulus of the probe, k is the spring constant of the spring that biases the probe in the direction of separation, and c is the constant. In the measuring element, L, E, and I are the same as each other, and A is {1- (2kL ³ / 3EI)} and B is {− (2L ³ / 3EI) c}, The calculation formula for obtaining Y is preferably represented by Y = AX + B.
The “detected value” includes an actually measured value acquired by adding a preset value to the detected value by the movement amount detecting means.

  Here, assuming that the load applied to the measuring element due to contact with the measurement site is P and that P is the same in the measurement unit, the mathematical formula for obtaining the true value Y of the dimension between the measurement sites is:

で表されるところ、さらに、Ｐ＝ｋＸ＋ｃ・・・（４）であることに基いて数式（１）を変形すると、測定部位間の寸法の真値Ｙを求める数式は、

Further, when transforming Equation (1) based on P = kX + c (4), the equation for obtaining the true value Y of the dimension between the measurement sites is as follows:

で表される。数式（２）は、Ｙ＝ＡＸ＋Ｂ・・・（３）と置くことができ、この数式（３）が、測定装置に予め設定された計算式である。数式（３）における演算係数であるＡおよびＢは、数式（２）におけるＬ、Ｅ、Ｉ、ｋ、ｃに具体的な数値を適用することにより得られ、これらのＡおよびＢの値は、演算制御手段に設けられた記憶手段などに予め設定されている。

It is represented by Equation (2) can be placed as Y = AX + B (3), and this equation (3) is a calculation formula preset in the measuring apparatus. The arithmetic coefficients A and B in the formula (3) are obtained by applying specific numerical values to L, E, I, k, and c in the formula (2). The values of these A and B are as follows: It is preset in a storage means provided in the arithmetic control means.

According to the present invention, it is possible to set the deflection amount according to the material and shape of the probe.
Further, in the calculation formula “Y = AX + B”, the detected value X is a variable, and further, it is possible to set a constant c such as a spring constant k and an initial tension of the spring. As can be seen, it is possible to cope with changes in the amount of deflection of the probe according to the width of the measurement range. Thereby, measurement accuracy improves compared with the case where it correct | amends based on the maximum deflection amount of a probe, and a more suitable measured value can be obtained.

  In the measuring apparatus of the present invention, the case main body is provided with a display unit for displaying the calculated value calculated by the calculation control means, and the case main body is provided so as to be movable in the axial direction, and one of the measuring elements is attached to the case main body. A spindle, and the measuring element includes a measuring element main body that comes into contact with the measurement site, and a holder that is detachably attached to the measuring element main body, and the holder is attached to and detached from an end of the spindle. A holder mounting portion is provided, and a plurality of planar pressing surfaces along the axial direction of the spindle are formed on the holder mounting portion around the shaft. It is preferable that the orientation relative to the display unit can be changed by being fixedly positioned.

According to this invention, since the measuring element includes the measuring element main body and the holder, when the measuring element main body is damaged, soiled, worn, or the like, only the measuring element main body can be replaced with a non-defective product by attaching and detaching the holder. This eliminates the need to replace the entire measuring device, improves maintenance, and reduces running costs. In addition, it is easy to change the shape and material of the probe according to the shape and material of the object to be measured, and the usability can be improved.
And since the holder attaching part is provided in the edge part of a spindle and the planar pressing surface is formed in this holder attaching part, a holder can be easily positioned and fixed to this pressing surface. In addition, since a plurality of pressing surfaces are formed around the spindle axis, the orientation of the probe extending from the holder with respect to the display unit can be changed in at least two directions. In other words, the angle can be adjusted as appropriate so that the display unit can be easily seen according to the position and orientation of the measurement site. Thereby, the visibility of the measured value in a display part and the handleability improve. In particular, it is useful when the direction in which the measuring device is arranged is limited, such as when measuring a gap in a narrow portion.
It is also conceivable to provide the same configuration as the holder mounting portion at the probe mounting portion of the case body.

In the measuring apparatus according to the present invention, it is preferable that a part of the measuring element that is in contact with the measurement site in a cross-sectional shape with respect to the extending direction is convex.
Here, examples of the cross-sectional shape with respect to the extending direction of the measuring element include a substantially semicircular shape, a substantially circular shape, and the like in which a convex outer peripheral portion curved in an arc shape is in contact with the measurement site. Moreover, the cross-sectional convex portion may be, for example, a portion where a straight line of a radial portion and an arc in a substantially semicircular shape intersect, or a corner portion such as a triangle or a rhombus.

According to this invention, the measuring element makes line contact (contact) with the measurement site along the extending direction of the measuring element at the convex portion. As a result, even if the orientation of the probe changes in the rotation direction of the extending direction, the convex portion rolls with the line contacted on the contacted surface of the measurement site, and before and after the change. There is almost no difference in the relative movement amount between the pair of measuring elements. That is, according to the present invention, the cross-sectional shape with respect to the extending direction of the measuring element is, for example, a rectangle, and in comparison with the configuration in which the measuring element is in surface contact or line contact with the measurement site by the change in attitude of the measuring element, A measurement error caused by a difference in posture when the probe is brought into contact with the measurement site can be sufficiently reduced. Therefore, the installation work of the measuring apparatus is facilitated and the usability is improved.
In addition, in the cross-sectional shape with respect to the extending direction of the tracing stylus, it is preferable that the width in the direction intersecting the approaching / separating direction of the pair of tracing stylus is small. When the width of the measuring element in the direction is large, the measuring elements do not sufficiently separate from each other and come into contact with the measurement site, resulting in a large measurement error. However, if the width of the measuring element is small as in the present invention, the measurement error is large. Can be reduced.

In the measuring apparatus according to the present invention, the measuring element has a wedge shape in which a cross-sectional shape with respect to the extending direction is tapered from one end to the other end, a tapered portion in the wedge shape faces the measurement site, and the pair It is preferable that the one ends of the measuring elements are close to each other.
Here, the wedge shape of the pair of measuring elements is formed symmetrically with respect to a predetermined point, and when the approaching / separating direction of the measuring element coincides with the direction connecting the measurement parts vertically (the state of the normal posture). The one end side of the taper is in contact with the measurement site, and the taper portion is not in contact with the measurement site.

  According to this invention, in a state where the posture of the probe changes in the extending direction of rotation, the tapered portion is brought into contact along the contacted surface of the measurement site. That is, even if the orientation of the probe is deviated from the normal posture, the deviation is within the range of the angle formed by the tapered portion and the contacted surface of the measurement site when the probe is in the normal posture. If there is, there is no influence on the relative movement amount between the pair of measuring elements, and no measurement error occurs. Therefore, the usability is greatly improved and the installation work of the measuring device is facilitated.

  In the measuring method of the present invention, the distal ends of a pair of measuring elements provided so as to be close to and away from each other and extending from the proximal end toward the distal end are brought into contact with both end portions between the measurement sites of the object to be measured, A measuring method for detecting a relative movement amount between the base ends of the pair of measuring elements and calculating a dimension between the measuring parts based on the detected value, wherein The dimension between the measurement parts is calculated from a preset calculation formula based on the amount of deflection due to contact and the detected value.

  According to the present invention, as described above, since the actual measurement value is corrected according to the deflection amount of the measuring element and the true measured value is calculated, the measuring element is a small piece inserted into a small gap and measured. Even when the deflection of the child greatly affects the measurement accuracy, the measurement can be performed with high accuracy. Further, it does not take time and effort to separately calculate the deflection amount of the probe.

  In the measuring method of the present invention, the measuring elements are formed so that the dimensions of the measuring elements in the approaching / separating direction are equal to each other, and the positions of the measuring elements in the approaching / separating direction of the measuring element are aligned, It is preferable to execute presetting (setting of values necessary for measurement) in a state where the measuring element is sandwiched from both sides in the proximity / separation direction of the element and the position thereof is fixed.

  According to the present invention, the position of the measuring element is fixed by fixing the measuring element so that the position of the measuring element is not shifted when the preset button or the like is operated for measurement initialization, and the reliability of the preset is improved. To do.

  In the measuring method of the present invention, the measuring element is sandwiched between the jaws of a thickness measuring instrument having a pair of jaws in a state where the measuring elements are aligned with each other in the approaching / separating direction of the measuring element. It is preferable to measure the dimension of the child in the proximity / separation direction and set the measured value measured by the thickness measuring instrument as a preset value.

According to the present invention, instead of performing master measurement work that requires skill, the thickness dimension of the probe (corresponding to the thickness of one probe) is measured using a thickness measuring instrument, and the measurement is performed. The value is a preset value. The preset value is adjusted according to the measurement site with respect to the relative movement amount between the proximal ends of the probe. This eliminates the need for a master, eliminates variations in preset values due to individual differences, and greatly improves the reliability of preset values. Moreover, since the thickness of the measuring element in a state where the measuring element is sandwiched by a thickness measuring instrument such as a caliper and is not bent is measured, the thickness dimension of the measuring element can be accurately measured. In this respect as well, the reliability of the preset value can be improved.
As described above, since the position of the measuring element is sandwiched and fixed when executing the preset, it is not necessary to adjust the position of the measuring element, and the time required for the preset can be greatly reduced.
In addition, since the thickness of the measuring element is measured at the same time as the position of the measuring element is fixed by sandwiching the measuring element with the thickness measuring instrument, the measured value and preset value by the thickness measuring instrument are measured when presetting is performed. Can be confirmed, and mistakes can be prevented.

<First Embodiment>
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
[1. Overall configuration of measuring device]
FIG. 1 is a front view of a measuring apparatus 1 as a measuring apparatus of the present embodiment, and FIG. 2 is a view showing a left side surface of the measuring apparatus 1 of FIG.
The measuring device 1 includes a case body 2 having a substantially cylindrical shape, and a spindle 4 penetrating the outer peripheral wall of the case body 2 is provided so as to be movable in the axial direction thereof. As shown in FIG. 3, the measuring device 1 has a pair of measuring elements 51 and 52 in contact with both end portions 101 and 102 of a gap 100 as a measurement site, respectively, and between a body of a car and a lamp. It measures the width dimension of the gap 100 which is a built-up part. It should be noted that, as with the gap size of such an assembly portion, the width of a normal groove, the inner diameter of a pipe, and the like can be measured in the same manner.
A display unit 61 for digitally displaying the measurement values is provided on the front surface of the case body 2, and operations such as a power button 621, a mode button 622, a zero set button 623, and a preset button 624 are provided around the display unit 61. Buttons are arranged.
In addition, the measuring apparatus 1 has a built-in calculation function for the movement amount of the spindle 4.

  In the following, the axial direction of the spindle 4 is the Y direction, the direction in which the measuring elements 51 and 52 extend from the proximal end toward the distal end in the plane intersecting the axial direction of the spindle 4 is the Z direction, and these The direction perpendicular to the Y direction and the Z direction may be described as the X direction.

The spindle 4 is held by a bearing (not shown) inside the bearing 22 and the stem 21 (see FIG. 5) provided on the outer peripheral wall of the case body 2 and is moved upward in FIG. 1 by a spring 29 provided near the bearing 22. Is being energized. At the time of measurement, the pressing portion 42 in the upper part of FIG. 1 is pushed down, and the spindle 4 is moved in the direction opposite to the direction of the urging force of the spring 29.
In FIGS. 1 and 2, the spindle 4 is in a free state in which the spindle 4 is moved upward to the position of a stopper (not shown) near the bearing 22 by the biasing force of the spring 29.

The measuring elements 51 and 52 are attached to the spindle 4 or the case main body 2 and are provided so as to be close to each other.
Specifically, a movable probe 51 that follows the axial movement of the spindle 4 is provided at the tip of the spindle 4.
The case body 2 is provided with a cylindrical body 23 having a substantially square cross section attached around the axis of the stem 21, and a fixed measuring element 52 is attached to a side surface of the cylindrical body 23 with a screw SC 4.
The cylindrical body 23 is attached to the stem 21 with a screw SC6, and can be attached by rotating by 90 ° around the axis of the spindle 4 by a positioning member (not shown) provided between the stem 21 and the cylindrical body 23. It has become.

  As shown in FIG. 4, the internal configuration 3 of the case body 2 includes a movement amount detection unit 31 that detects the movement amount of the spindle 4 as an electric signal, and a value calculated based on a detection value by the movement amount detection unit 31. The calculation control means 32 displayed on the display unit 61 and the switch unit 33 to which operation buttons such as a mode button 622, a zero set button 623, and a preset button 624 are connected are configured.

  The movement amount detection means 31 includes a length measurement sensor 311. Although not shown, the length measurement sensor 311 includes a main scale and an index scale provided between the case body 2 and the spindle 4, and a length measurement circuit that detects the relative movement amount of these scales as an electric signal. Have.

The arithmetic control unit 32 calculates the size of the gap 100 based on the detection value output from the movement amount detection unit 31. Here, the calculation function of the measuring apparatus 1 is implemented as calculation control means 32, and a calculation formula (described later) relating to the calculation function is set in the calculation control means 32. The arithmetic control unit 32 includes a CPU 321 and a memory 322.
The memory 322 stores calculation formulas related to the calculation function, calculation coefficients in the calculation formulas, preset values of the measuring apparatus 1, and the like.
The CPU 321 calculates a calculation formula based on the detection value output from the movement amount detection unit 31, the preset value read from the memory 322, and the calculation coefficient.

[2. Measuring element structure)
Next, the structure of the movable measuring element 51 and the fixed measuring element 52 will be described.
FIG. 5 is a diagram showing a state in which the movable probe 51 is detached from the spindle 4, and FIG. 6 is a cross-sectional view of the movable probe 51 with respect to the spindle 4 axial direction.
As shown in FIG. 5, the movable probe 51 holds a probe main body 511 in which the tip 511 </ b> B abuts on the end 101 (FIG. 3) of the gap 100, and a base end 511 </ b> C of the probe main body 511. And a holder 512 that extends in an in-plane direction substantially orthogonal to the axial direction of the spindle 4. The holder 512 of the movable probe 51 is detachably attached to the holder attachment portion 41 at the tip of the spindle 4.
Here, the holder mounting portion 41 is a cylindrical body that protrudes in the axial direction of the spindle 4 and has a substantially square cross section with respect to the shaft. Each surface 411 is formed. An internal thread is formed inside the holder mounting portion 41.

  The holder 512 includes a hexahedral block portion 513 for attachment to the spindle 4, a holding portion 514 that extends in the Z direction within a plane orthogonal to the axial direction of the spindle 4 and holds the probe main body 511, and the holding portion 514, and a plate portion 515 that sandwiches the probe main body 511.

  Here, a mounting structure between the block portion 513 and the spindle 4 will be described. As shown in FIGS. 5 and 6, a fixing hole 513 </ b> A through which the holder mounting portion 41 of the spindle 4 is inserted is formed through the block portion 513 along the axial direction (Y direction) of the spindle 4. The inside of the fixing hole 513A has a stepped shape having a small diameter opposite to the side on which the spindle 4 is inserted. The holder 512 is fixed to the spindle 4 by screwing the screw SC2 inserted into the fixing hole 513A from the side opposite to the holder mounting portion 41 into the female screw inside the holder mounting portion 41.

Further, as shown in FIG. 6, a locking hole 513 </ b> C is formed in the block portion 513 along the Z direction orthogonal to the axial direction of the spindle 4. The locking hole 513C penetrates to the fixing hole 513A, and the screw SC5 is inserted through the locking hole 513C. The screw SC5 presses the pressing surface 411 of the holder mounting portion 41 via the locking hole 513C, and locks the holder mounting portion 41 to the fixing hole 513A. As a result, the holder 512 is positioned.
Then, by loosening the screw SC5, the orientation of the holder 512 can be changed by 90 ° around the axis of the spindle 4 while the holder mounting portion 41 is still inserted into the fixing hole 513A. In other words, in FIG. 6, the direction in which the probe 51 extends in the four directions of front, rear, left, and right can be changed with respect to the display surface of the display unit 61.

The holding portion 514 is fixed to one of the side surfaces intersecting the surface where the fixing hole 513A of the block portion 513 is formed by two screws SC1. The holding portion 514 includes a substantially rectangular attachment portion 514B attached to the side surface of the block portion 513, and an extension portion 514C extending in the Z direction continuously with the attachment portion 514B. It is formed in a plate shape having a plate surface including a direction.
The plate portion 515 is provided so as to overlap the end surface (XZ plane orthogonal to the axial direction of the spindle 4) on the side in the extending direction of the extending portion 514C.

Next, FIG. 7 is an enlarged view showing the tip side of the probe 51.
The probe body 511 is formed in a very thin plate shape using a hard alloy or the like, and extends in the Z direction from between the holding portion 514 and the plate portion 515.
Two holes 515A are formed in the plate portion 515, screws SC3 are inserted through the holes 515A, and the screws SC3 are respectively screwed into two screw portions 514A formed in the holding portion 514. . In addition, since the plate part 515 is provided on the opposite side of the case body 2 with respect to the holding part 514, it is easy to handle the screw SC3.
Here, a U-shaped notch 511A for releasing the screw SC3 is formed in the measuring element main body 511, and the measuring element main body 511 can be easily removed from the holder 512 at the notch 511A portion by loosening the screw SC3. It has become.

FIG. 8 is an enlarged view of the distal end side of the probe main body 511. The probe main body 511 is formed in a taper shape, and the tip portion 511B is formed to protrude in a thin U shape along the extending direction of the probe main body 511. With such a shape, the distal end portion 511B of the measuring element main body 511 can be inserted between a slight gap, and the base end portion 511C wider than the distal end portion 511B is given strength.
Further, the taper portion 511D to the tip portion 511B are formed in a three-dimensional curved surface shape subjected to R processing equivalent to ½ of the plate thickness. The curved surface R processing is not limited to 1/2 of the plate thickness.

On the other hand, the fixed probe 52 also includes a probe main body 521 and a holder 522 (see FIGS. 1 and 2). The probe main body 521 has the same configuration as the probe main body 511 of the movable probe 51 described above, and is detachable from the holder 522. The holder 522 has a holding part 524 and a plate part 525 similar to the above-described plate part 515.
The holding portion 524 has a substantially L shape extending in the axial direction of the spindle 4 and the Z direction orthogonal to the axial direction, and the base end side is attached to the cylindrical body 23 by a screw SC4.
Here, a convex portion 231 that protrudes in the X direction is formed in a portion of the cylindrical body 23 to which the holder 522 is attached, and the holder 512 of the movable measuring element 51 and the holder 522 of the fixed measuring element 52 are aligned in the X direction. (Figure 2).
As described above, since the cylinder body 23 can be rotated by 90 ° around the axis of the stem 21, the orientation of the holder 522 attached to the cylinder body 23 can be changed to the same orientation as the above-mentioned holder 512, and the measuring element The direction in which the main bodies 511 and 521 extend can be aligned.

[3. Deflection amount of probe
Although the measuring elements 51 and 52 have been described above, the measuring element main bodies 511 and 521 are thin as a whole and the tip portion 511B has a thin shape and is in contact with the end portions 101 and 102 of the gap 100. The amount of deflection is large. FIG. 3 highlights the deflection. At the time of measurement, the push-down portion 42 of the spindle 4 is pushed down, and the tip portions 511B and 521B are inserted into the gap 100 in a state where the probe main bodies 511 and 521 are close to each other and are substantially aligned with each other. In this state, when the application of external force to the pressing portion 42 is stopped, the spindle 4 is moved upward in FIG. 1 by the restoring force of the spring 29, and accordingly, the probe main bodies 511 and 521 are separated from each other, and the tip portion 511B and 521B are brought into contact with the end portions 101 and 102 of the gap 100, respectively. At this time, the measuring element main bodies 511 and 521 receive a load due to contact with the end portions 101 and 102 of the gap 100 and bend as shown in FIG.

  At this time, the relative movement amount between the base end portions 511C and 521C of the measuring element main bodies 511 and 521 is larger than the true value Y of the dimension between the end portions 101 and 102. That is, the relative movement amount between the base end portions 511C is detected by the movement amount detection unit 31 as the movement amount of the spindle 4, and the calculation control unit 32 sets a preset value (measurement) to the detection value output from the movement amount detection unit 31. The actually measured value obtained by adding (correction value) is a value corresponding to X in FIG. The actual measurement value X (value based on the detection value) is larger than the true value Y because of the deflection amount T1 of the probe main body 511 and the deflection amount T2 of the probe main body 521, and a measurement error occurs here.

Therefore, the memory 322 stores calculation coefficients corresponding to the deflection amounts of the probe main bodies 511 and 521 as follows.
Here, the load applied to the probe main body 511 by the contact with the end portion 101 of the gap 100 is P, and from the contact position of the probe main body 511 with the end portion 101 of the gap 100 to the base end portion 511C to the holder 512. Is L, the elastic modulus of the probe main body 511 is E, and the section modulus of the probe main body 511 is I. When the measuring element main body 521 of the fixed measuring element 52 is the same as the measuring element main body 511 with respect to the load P, the length L, the elastic modulus E, and the section modulus I related to these measuring element main bodies 511, the above measured value X is obtained. Based on the formula of the deflection of the cantilever beam in material mechanics,

で表される。そして、スピンドル４のスプリング２９に係るバネ定数をバネ定数ｋとし、スプリング２９の初張力、あるいはスピンドル４とステム２１および軸受２２との摩擦係数などを定数ｃとして、ばね定数に係る公式、Ｐ＝ｋＸ＋ｃ・・・（４）に基いて数式（１）を変形する。そうすると、真値Ｙを求める数式は、

It is represented by A spring constant related to the spring 29 of the spindle 4 is a spring constant k, and an initial tension of the spring 29 or a coefficient of friction between the spindle 4 and the stem 21 and the bearing 22 is a constant c. Equation (1) is transformed based on kX + c (4). Then, the mathematical formula for calculating the true value Y is

で表される。
ここで、数式（２）は、Ｙ＝ＡＸ＋Ｂ・・・（３）と置くことができ、この数式（３）が測定装置１の演算機能に係る計算式としてメモリ３２２に記憶されている。また、数式（３）におけるＡおよびＢは、測定子本体５１１，５２１のたわみ量を求める演算係数であり、これらの演算係数Ａ，Ｂもメモリ３２２に記憶されている。演算係数ＡおよびＢは、数式（２）におけるＬ、Ｅ、Ｉ、ｋ、ｃに具体的な数値を適用することにより得られ、予め、所定のボタン操作によってメモリ３２２に入力されている。

It is represented by
Here, the mathematical formula (2) can be set as Y = AX + B (3), and this mathematical formula (3) is stored in the memory 322 as a calculation formula related to the calculation function of the measuring apparatus 1. A and B in Equation (3) are calculation coefficients for obtaining the deflection amount of the measuring element main bodies 511 and 521, and these calculation coefficients A and B are also stored in the memory 322. The arithmetic coefficients A and B are obtained by applying specific numerical values to L, E, I, k, and c in Expression (2), and are previously input to the memory 322 by a predetermined button operation.

[4. (Measuring device preset)
Next, a preset method of the measuring apparatus 1 will be described with reference to FIG.
In the presetting of the measuring apparatus 1, the thickness of one measuring element main body 511 or 521 is measured using a caliper CL without performing master measurement, and the measured value is set as a preset value. The material and shape of the measuring element main bodies 511 and 521 are the same as each other, and the thickness dimensions are also the same.

(4-1) Measurement with calipers First, the positions of the measuring element main bodies 511 and 521 are aligned in the approaching and separating directions of the measuring element main bodies 511 and 521 (the Y direction which is the axial direction of the spindle 4). Since the measuring element main bodies 511 and 521 are provided side by side in the X direction (FIG. 2), the measuring element main bodies 511 and 521 are separated from the ends 101 and 102 of the gap 100 (perpendicular to the axial direction of the spindle 4). In-plane direction), the positions of each other are aligned without overlapping.
In this state, as shown in FIG. 9, the tip portions 511B and 521B of the measuring element main bodies 511 and 521 to the base end portions 511C and 521C are sandwiched by the pair of jaws J1 and J2 of the caliper CL from both sides in the Y direction. The thickness of the probe main body 511, 521 in a state of not being measured is measured.

(4-2) Setting of Preset Value Next, the preset button 624 is pressed a plurality of times, and the measurement value by the caliper CL, that is, the thickness dimension of the measuring element main bodies 511 and 521 is set as the preset value. At this time, it is not necessary to sandwich the measuring element main bodies 511 and 521 with the caliper CL.

(4-3) Set to standby state Next, press the button to set the standby state for preset execution. Then, the preset value set in the above (4-2) is displayed on the display unit 61.

(4-4) Execution of preset When executing the preset, the measuring element main bodies 511 and 521 are sandwiched again with the caliper CL, and the positions of the measuring element main bodies 511 and 521 are fixed.
When it is confirmed that the measured value by the caliper CL matches the preset value displayed on the display unit 61, the preset button 624 is pressed while the measuring element main bodies 511 and 521 are sandwiched by the caliper CL. And execute the preset. Thus, since the positions of the probe main bodies 511 and 521 are fixed by the calipers CL, it is possible to determine the preset value without adjusting the positions of the probe main bodies 511 and 521. There is no fear that the position of the measuring element main bodies 511 and 521 is shifted or bent due to vibration or gravity when the preset button 624 is pressed.
When the preset is executed, the preset value is determined and stored in the memory 322.

[5. (Measurement between measurement sites)
Hereinafter, the measurement procedure of the measurement apparatus 1 will be described with reference to FIGS. 1, 3, 4, and the like.
First, the pressing portion 42 of the spindle 4 is pushed down, and the tip portions 511B and 521B are inserted into the gap 100 in a state where the measuring element main bodies 511 and 521 are close to each other and the positions are substantially aligned with each other. In this state, when the application of external force to the pressing portion 42 is stopped, the spindle 4 is moved upward in FIG. 1 by the restoring force of the spring 29, and accordingly, the probe main bodies 511 and 521 are separated from each other, and the tip portion 511B and 521B are brought into contact with the end portions 101 and 102 of the gap 100, respectively.

When the measuring element main bodies 511 and 521 are brought into contact with the end portions 101 and 102, the relative movement amount between the base end portions 511C is detected as an electric signal by the movement amount detecting means 31 as the movement amount of the spindle 4. The detected value signal is output to the arithmetic control means 32.
In the calculation control means 32, the preset value, the calculation formula related to the calculation function, and the calculation coefficients A and B of the calculation formula are read from the memory 322, and the detection value output from the movement amount detection means 31 and the measuring element Based on the amount of deflection of the main bodies 511 and 521, the dimension of the gap 100 is calculated from a calculation formula related to the calculation function.

Specifically, the calculation control unit 32 obtains the actual measurement value X by adding a preset value to the detection value output from the movement amount detection unit 31. Further, the actual value Y between the end portions 101 and 102 of the gap 100 is obtained by substituting the actual measurement value X and the calculation coefficients A and B into the calculation formula “Y = AX + B”.
The true value Y is a value (calculated value) corresponding to a value obtained by subtracting the deflection amounts T1 and T2 of the measuring element main bodies 511 and 521 from the actual measurement value X as shown in FIG. It is displayed in a predetermined area of the display unit 61. Thus, the dimension measurement of the gap 100 is completed.

Depending on the shape and material of the end portions 101 and 102, the probe main bodies 511 and 521 can be removed from the holders 512 and 522 and replaced with different types of probe main bodies 511 and 521. In this case, it is preferable to reset the calculation coefficients A and B based on the elastic modulus E, section modulus I, length L, etc. of the probe main bodies 511 and 521 after replacement.
Even when the spring force of the spring 29 is adjusted, it is preferable to reset the calculation coefficients A and B based on the adjusted spring constant k, constant c, and the like.

According to this embodiment, there are the following effects.
(1) Since the actual measurement value X is corrected and the true value Y is calculated by the arithmetic control means 32 in accordance with the deflection amount of the probe main body 511, 521, it is accurate considering the deflection amount of the probe main body 511, 521. Measurement can be performed quickly. As a result, the measurement accuracy when the thin and long probe body 511, 521 is adopted so that the narrow gap 100 can be measured can be greatly improved, and the measurement of the very small gap 100 can be supported. Further, it is possible to save time for separately calculating the deflection amount of the measuring element main bodies 511 and 521 based on a conversion table and the like, thereby shortening the time required for the measurement work.

(2) Elasticity coefficient E, section modulus I of the probe body 511, 521, length L related to the contact position from the base end portions 511C, 521C to the end portion 101.102, the spring constant k of the spring 29, and the initial tension The value obtained by c is stored in the memory 322 as calculation coefficients A and B corresponding to the deflection amounts of the probe main bodies 511 and 521. That is, by setting the elastic modulus E, section modulus I, and length L, it is possible to set the amount of deflection according to the material and shape of the probe body 511, 521.
In the calculation formula “Y = AX + B”, the actual measurement value X is a variable, and it is possible to set the constant c such as the spring constant k and the initial tension of the spring, as can be seen from the above formula (4). In addition, it is possible to cope with changes in the amount of deflection of the probe main bodies 511 and 521 according to the width of the measurement range (stroke of the spindle 4). Therefore, the accuracy of the measured value of the gap 100 dimension obtained as the true value Y can be flexibly improved.

(3) Although the measuring element main bodies 511 and 521 are thin and thin, they may be damaged. However, even when the measuring element main bodies 511 and 521 are damaged, soiled, or worn, only the measuring main bodies 511 and 512 are removed from the holders 512 and 522 to be new. Can be exchanged. This eliminates the need to replace the measuring elements 51 and 52 or the entire measuring apparatus 1, thereby improving maintenance and reducing running costs.
Further, it is easy to change the shape and material of the probe main bodies 511 and 521 in accordance with the shape and material of the object to be measured, and the usability is greatly improved.

(4) Here, since the notch 511A for releasing the screw SC3 for fixing the holding portion 514 and the plate portion 515 to each other is formed in the probe main body 511 (the same applies to the probe main body 521), the screw SC3 is loosened. Thus, the probe main body 511, 521 can be removed and replaced between the holding portion 514 and the plate portion 515, and the replacement operation of the probe main body 511, 521 is easy.

(5) Furthermore, pressing surfaces 411 are formed on the four side surfaces of the holder mounting portion 41 so that the holder 512 can be positioned and fixed around the axis of the spindle 4 by 90 °. That is, the direction of the movable measuring element 51 can be changed according to the width direction of the gap 100, and the direction of the fixed measuring element 52 can also be changed by changing the direction of the cylindrical body 23. You can align the orientation. Thereby, even when the measurement work is performed in a narrow place, there is no inconvenience that the display unit 61 faces the back side when viewed from the measurer and the displayed measurement value cannot be visually recognized. Therefore, the handleability can be greatly improved.

(6) Since the outer peripheral shape of the tip 511B of the probe main body 511 (same as the probe main body 521) is a convex curved surface and not angular, the probe main bodies 511 and 521 are inserted into the gap 100. At the same time, it is possible to prevent the object to be measured from being damaged when the probe main bodies 511 and 521 are brought into contact with the end portions 101 and 102, respectively. Thereby, the measuring apparatus 1 can be used also for the measurement of the coating surface and the resin bumper part which are easily damaged. That is, the material of the measurement site is not selected.
In addition, it is preferable to form the whole contact part with the measurement site | part of a measuring element in a curved surface form.

(7) The use of the caliper CL during presetting solves the problem of deflection of the thin and thin stylus main bodies 511 and 521, makes the preset operation extremely easy, and makes use of the accuracy of the caliper CL to change the preset value. Reliability can be improved to the limit.

That is, at the time of presetting, the base end portions 511C and 521C of the measuring element main bodies 511 and 521 are sandwiched with the caliper CL, and the thickness dimensions of the measuring element main bodies 511 and 521 are measured. Thereby, the thickness dimension of the measuring element main bodies 511 and 521 in a state without deflection can be accurately measured.
When the preset is executed, the preset value set to the measured value of the caliper CL is determined while the position of the measuring element main bodies 511 and 521 is fixed with the caliper CL while the position is fixed. Thereby, even when the preset button 624 is pressed, the positions of the measuring element main bodies 511 and 521 are not shifted, and the reliability of the preset can be greatly improved.
Furthermore, when performing presetting, the measured values of the thicknesses of the measuring elements 511 and 521 sandwiched between the calipers CL can be read to check whether or not they match the preset values on the display unit 61. Can also be prevented.

Since master measurement is not performed using the thickness dimensions of the probe body 511, 521 as a preset value, a master gauge can be dispensed with, and variations in the preset value due to individual differences are eliminated, and the reliability of the preset value is greatly improved. .
Also, since various vernier calipers CL are provided that are easy to use, the time required for presetting can be shortened.

[Second Embodiment]
Next, a second embodiment of the present invention will be described.
In the following description, the same reference numerals are given to the same configurations as those in the embodiment described above, and the description is omitted or simplified.
In this embodiment, the cross-sectional shape with respect to the extending direction of the measuring element main body is changed in the first embodiment.

FIGS. 10A and 10B are cross-sectional views of the probe main bodies 711 and 721 according to the present embodiment as viewed in the extending direction. Here, the extending direction of the probe main bodies 511 and 521 will be described as the X direction, the direction connecting the end portions 101 and 102 of the gap 100 as the Y direction, and the direction orthogonal to the YZ plane as the Z direction. Further, the approaching / separating direction of the measuring element main bodies 711 and 721 will be described as the axial direction S. The inner wall surfaces of the end portions 101 and 102 of the gap 100 are parallel to each other, and the Y direction is a direction connecting these end portions 101 and 102 vertically, that is, a width direction in which the dimension of the gap 100 is measured. Suppose that
As shown in FIGS. 10A and 10B, the measuring element main bodies 711 and 721 have a semicircular cross-sectional shape in the extending direction (Z direction), and a straight line and an arc of the diameter portion are formed. The intersecting outer peripheral portions 711A and 721A are in line contact with the end portions 101 and 102 along the extending direction of the measuring element main bodies 711 and 721, respectively.

  By the way, as described in the first embodiment, when measuring the dimension between the end portions 101 and 102 of the gap 100, the measuring element main bodies 511 and 521 are separated from each other until they contact the end portions 101 and 102, respectively. The size of the gap 100 was calculated based on the relative movement amount between the probe main bodies 511 and 521 at that time. Therefore, in the measurement, it is considered that the proximity / separation direction (axial direction S) of the probe main bodies 711 and 721 needs to coincide with the Y direction connecting the end portions 101 and 102 of the gap 100.

  FIG. 10A shows a state in which the Y direction connecting the end portions 101 and 102 of the gap 100 is coincident with the approaching / separating direction (axial direction S) of the measuring element main bodies 711 and 721. Here, when considering the amount of deflection of the probe main bodies 711 and 721 in a simplified manner, the size of the gap 100 is the relative movement amount between the probe main bodies 711 and 721 (here, from the end portion 102 to the probe main body. This is a dimension D2 obtained by adding a preset value (thickness of the measuring element main body 721) PX to the distance D1 to 711). Actually, X larger than D1 becomes an actual measurement value due to the deflection of the measuring element main bodies 711 and 721 (FIG. 3), and this actual measurement value X is corrected as described in the first embodiment, and the dimension between the gaps 100 is obtained. The true value of is obtained.

Here, depending on the installation posture of the measuring apparatus 1 and the posture at the time of use, the measuring element main bodies 711 and 721 are obliquely applied to the contact surfaces of the end portions 101 and 102, and the axial direction S is the Z direction with respect to the Y direction. Let us consider a case where there is a deviation in the rotation direction (XY in-plane rotation direction). In this case, the state shown in FIG. 10B is obtained, and the outer peripheral portions 711A and 721A of the measuring element main bodies 711 and 721 are in contact with the contact surfaces of the end portions 101 and 102, as compared with the state shown in FIG. It will be in the state of rolling while keeping line contact on each.
At this time, since the cross-sectional shape of the measuring element main bodies 711 and 721 in the extending direction is a semicircular shape protruding toward the end portions 101 and 102, the width of the measuring element main bodies 711 and 721 in the X direction is relatively long. It is small. Due to such a shape, the measuring element main bodies 711 and 721 are separated at a sufficient distance in the gap 100.
The measuring element main bodies 711 and 721 have a small width in the X direction and a shape protruding from the end portions 101 and 102. However, since R treatment is applied to all corners, a resin bumper or painted surface is used. There is no risk of scratching parts in the vicinity. In addition, this R process is a three-dimensional machining equivalent to 1/2 of the thickness of the measuring element main bodies 711 and 721 as in the first embodiment.

  Therefore, the relative movement amount between the measuring element main bodies 711 and 721 is hardly changed between FIG. 10A and FIG. That is, the relative movement amount D1 in FIG. 10 (A) is only slightly smaller than the relative movement amount D3 between the measuring element main bodies 711 and 721 in FIG. 10 (B), and the preset value PX is added to this D3. The dimension D4 is also only slightly smaller than the dimension D2 in FIG. Therefore, the influence of the inclination of the posture of the measuring element main bodies 711 and 721 on the measured value of the dimension of the gap 100 is small, and a measured value close to the true value can be obtained by the above-described deflection amount correction.

  In addition, regarding the direction of the semicircular shape of the cross-sectional shape of the probe main bodies 711 and 721, the probe main bodies 711 and 721 are closely spaced in the direction corresponding to the Y direction in the state shown in FIG. Also good. In this case, the probe main bodies 711 and 721 are always in line contact with the abutted surfaces of the end portions 101 and 102 even when the probe main bodies 711 and 721 are inclined in either the left or right direction in FIG. Therefore, similarly to the above, it is possible to reduce the error in the measured value due to the inclination of the posture of the measuring element main bodies 711 and 721.

  Next, FIGS. 11A and 11B are diagrams for comparison with the states shown in FIGS. 10A and 10B, respectively. 11A and 11B, the cross section in the extending direction of the probe main body 811 and 821 is a rectangular shape whose corners are R-processed, and the width dimension of the probe main body 811 and 821 in the X direction is measured. It is larger than the same dimensions of the child main bodies 711 and 721. Although the cross-sectional shapes of the probe main bodies 811 and 821 are different from those of the probe main bodies 711 and 721, the thickness dimensions in the Y direction are the same between the probe main bodies 811 and 821 and the probe main bodies 711 and 721. For this reason, the preset value PX is the same in FIGS.

  FIG. 11A shows a state where the axial direction S coincides with the Y direction. In this state, the probe main bodies 811 and 821 have plate surfaces 811A and 821A in surface contact with the end portions 101 and 102, respectively. Here, when considering the amount of deflection of the probe main bodies 811 and 821 in a simplified manner, the size of the gap 100 is the relative movement amount D1 between the probe main bodies 811 and 821. D1 and a dimension D2 obtained by adding a preset value PX to D1 are the same values as D1 and D2 shown in FIG.

Here, the measuring element main bodies 811 and 821 are obliquely applied to the contact surfaces of the end portions 101 and 102, and from the state of FIG. 11A, the axial direction S is the rotation direction in the Z direction (XY in-plane rotation direction). ) Consider the case where it is off. In this case, the state shown in FIG. 11B is obtained, and the plate surfaces 811A and 821A are inclined with respect to the abutted surfaces of the end portions 101 and 102, and the measuring element main bodies 811 and 821 have corner portions with rectangular cross sections. It will be in the state which carried out the line contact to the edge parts 101 and 102 along.
As described above, since the posture of the probe main body 811 or 821 is changed with respect to the contact surface of the end portions 101 and 102, the relative movement amount of the probe main body 811 or 821 is D5 shown in FIG. D5 is considerably smaller than D1 in FIG. That is, since the measurement main bodies 811 and 821 are rectangular in cross section and the width dimension in the X direction of the measurement main bodies 811 and 821 is large, the measurement main body 811 is caused by the inclination of the posture of the measurement main bodies 811 and 821. , 821 are not separated from each other by a sufficient distance, and the corner portions 811B and 821B are brought into contact with the end portions 101 and 102, respectively.
Therefore, the dimension D6 obtained by adding the preset value PX to D5 is also considerably smaller than the dimension D2 in FIG. That is, in the case of the measuring element main bodies 811 and 821, a large error occurs in the measurement value of the dimension of the gap 100 due to the inclination of the posture, and the measurement value close to the true value cannot be obtained even by the above-described deflection amount correction.

According to this embodiment, in addition to the effects (1) to (7) described above, the following effects can be obtained.
(8) Measurement that occurs when the probe main bodies 711 and 721 are obliquely applied to the contact surfaces of the end portions 101 and 102 of the gap 100 by the convex outer peripheral portions 711A and 721A of the probe main bodies 711 and 721. The error can be minimized. Thereby, the installation work of the measuring apparatus 1 becomes easy and usability is greatly improved.

(9) Furthermore, the width dimension in the X direction of the measuring element main bodies 711 and 721 is relatively small, and even if the measuring element main bodies 711 and 721 are inclined inside the gap 100, they are separated at a sufficient interval inside the gap 100. The width dimension of the measuring element main bodies 711 and 721 is determined according to the dimension of the gap 100 to be measured. As described above, the outer peripheral shape of the side of the measuring element main bodies 711 and 721 that is in contact with the end portions 101 and 102 and the entire cross-sectional shape of the measuring element main bodies 711 and 721 are set in accordance with the minimum measurement width of the measurement target. Thus, the error due to the inclination of the measuring device 1 can be made extremely small to the same extent as that of the conventional caliper. That is, the reliability is significantly improved.

[Modification]
The present invention is not limited to the embodiments described above.
That is, the present invention has been illustrated and described primarily with respect to particular embodiments, but without departing from the spirit and scope of the present invention relative to the embodiments described above. Various modifications may be made by those skilled in the art in terms of shape, material, quantity, and other detailed configurations.

In the modification of the present invention shown in FIGS. 12A and 12B, the measurement error due to the inclination of the attitude of the measuring element main body is dealt with by a configuration different from the second embodiment.
12A and 12B, the cross-sectional shape of the measuring element main bodies 911 and 921 with respect to the extending direction is a wedge shape. Specifically, the measuring element main bodies 911 and 921 are in the X direction. , 921 has a tapered shape that gradually tapers from one end to the other end on the close side. Further, the shape of the measuring element main bodies 911 and 921 is formed symmetrically with respect to the center point O in FIGS. 12 (A) and 12 (B). Here, in the state (normal posture) of FIG. 12A in which the axial direction S, which is the approaching / separating direction of the measuring element main bodies 911 and 921, coincides with the Y direction (the direction connecting the end portions 101 and 102 vertically), the measurement is performed. The tapered portions 911 </ b> A and 921 </ b> A in the wedge shape of the child main bodies 911 and 921 face each other in a state where they are not in contact with the end portions 101 and 102 of the gap 100. In addition, in the wedge shape of the measuring element main bodies 911 and 921, the corners are rounded by R processing to prevent scratches.

According to such a configuration, when the posture of the probe main body 911, 921 changes from the state of FIG. 12A to the state of FIG. Tapered portions 911A and 921A are in contact with the contacted surface of 102, respectively. Here, in FIG. 11B described above, unlike the case where the corner portions 811B and 821B of the measuring element main bodies 811 and 821 having a rectangular cross section are in contact with the end portions 101 and 102, respectively, the end portion 101 The distance D1 between the stylus body 922 and the stylus body 922 does not change before and after the posture change of the stylus bodies 921, 922. Therefore, the value D2 obtained by adding the preset value PX to D1 does not change before and after the posture change.
That is, even if the measuring element main bodies 911 and 921 are deviated with respect to the normal posture, the deviations are the tapered portions 911A and 921A and the end portions 101 and 101 when the normal posture shown in FIG. If it is within the range of the angle θ formed by the contacted surface of 102, the relative movement amount between the measuring element main bodies 911 and 921 is not affected. As described above, it is possible to cope with a measurement error caused by a difference in posture when contacting the end portions 101 and 102 of the probe main body 911 and 921, so that the usability is greatly improved and the installation work of the measuring device 1 is easy. Can be.

In the modification of the present invention shown in FIGS. 13A and 13B, the orientation of the measuring element main bodies 711 and 721 described with reference to FIG. 10 in the second embodiment is extended. Rotated 90 ° around the direction. That is, in FIGS. 13A and 13B, the cross-sectional shape with respect to the extending direction of the measuring element main bodies 1011 and 1021 is a semicircular shape in which the side in contact with the end portions 101 and 102 is an arc.
Even with such a configuration, since the outer periphery of the arc-shaped convex shape comes into contact with the end portions 101 and 102, as described in the second embodiment, even when the posture of the probe main body 1011 and 1021 is changed, it is accurate. Measurement can be performed. That is, the distance D1 from one measuring element main body 1021 to the end 101 when the approaching / separating direction (axial direction S) of the measuring element main bodies 1011 and 1021 coincides with the axial direction (Y direction) of the spindle 4. When the axial direction S and the Y direction are deviated, the difference from the distance D9 between the probe main body 1021 and the end 101 is small. Therefore, an error of values D2 and D10 obtained by adding the preset value PX to D1 and D9 can be reduced.

  The measuring element main bodies 1011 and 1021 have a semicircular cross-sectional shape, and the shape opposite to the outer peripheral portions 1011A and 1021A that are in contact with the end portions 101 and 102 is planar. Thereby, the dimension in the approaching / separating direction (axial direction S) of the measuring element main bodies 1011 and 1021 can be made smaller than the case where the measuring element main body 1011.1021 has a circular cross section, etc. Suitable.

In the measurement apparatus of the present invention, the preset calculation formula is not limited to that shown in each of the above embodiments.
For example, the calculation formula “Y = AX + B + CX ⁻¹ ” can also be handled in substantially the same manner as the calculation formula “Y = AX + B” shown in the first embodiment, and thus the calculation formula set in advance in the measurement apparatus of the present invention. Suitable for. That is, the number of operation coefficients and variables in the calculation formula, and the mode thereof are not limited.

  In the first embodiment, the calculation coefficients A and B in the calculation formula include the length L from the base end portion 511C of the probe main body 511 to the contact position with the end 101, and the elastic coefficient of the probe main body 511. E, the section modulus I of the probe main body 511, the spring constant k of the spring 29, and the constant c such as the initial tension of the spring 29 were set to specific values. The calculation coefficient of the calculation formula may be set based on other values.

Furthermore, the variable in the calculation formula is only “X” related to the actual measurement value obtained by adding the preset value to the detection value in the first embodiment. However, the variable is not limited to this. In the case of a configuration in which a length L from the proximal end portion of the probe to the contact position with the measurement site is obtained at the time of measurement, a calculation formula using this length L as a variable is provided. It can also be configured. On the other hand, the length L can also be a fixed value based on the shape of the probe.
In each of the above embodiments, the calculation formula used in the arithmetic control means 32 is stored in the memory 322. However, the calculation formula storage means may be of any type such as a RAM (Random Access Memory) or a hard disk. Further, instead of storing the calculation formula in the storage means, it may be mounted on an arithmetic circuit in the arithmetic control means.

Further, in each of the embodiments described above, the measurement value of the gap 100 is displayed on the display unit 61 provided in the case main body 2. However, the present invention is not limited to this. For example, the measurement device is connected to a computer system. The measurement value may be displayed on the screen.
Further, the calculation coefficient of the calculation formula may be set via such a computer system.

  In each of the embodiments, the width dimension of the gap 100 is measured. In other words, the inner dimension of the object has been measured, but not limited to this, the deflection of the measuring element also occurs when measuring the outer dimension of the object, such as the width or length of the convex portion of the object to be measured. The measuring apparatus and measuring method of the present invention can be applied.

  The present invention can be suitably used when measuring dimensions such as a gap and a groove width. Since the amount of deflection of the measuring element is corrected, it is effective when the measuring element is formed very thin and thin to measure the size of a slight gap or a narrow groove.

The front view of the measuring apparatus in 1st Embodiment of this invention. The side view of the measuring apparatus in the said embodiment. In the said embodiment, the side view which shows the measuring element each contact | abutted at the both ends of a clearance gap. The block diagram which shows the internal structure of the measuring apparatus in the said embodiment. The disassembled perspective view which shows the holder of the measuring element of the said embodiment. Sectional drawing which shows the holder of the measuring element of the said embodiment. The disassembled perspective view which shows the measuring element main body and holder in the said embodiment. The enlarged view which shows the front end side of the measuring element main body in the said embodiment. The figure which shows a mode that a caliper is used at the time of a preset in the measuring apparatus of the said embodiment. Sectional drawing with respect to the extension direction of the measuring element main body contact | abutted at the both ends of a clearance gap in the measuring apparatus of 2nd Embodiment of this invention. It is a figure for contrast with FIG. 10, Comprising: Sectional drawing with respect to the extension direction of the measuring element main body contact | abutted at the both ends of a clearance gap. Sectional drawing with respect to the extension direction of the measuring element main body contact | abutted at the both ends of a clearance gap in the measuring apparatus of the modification of this invention. Sectional drawing with respect to the extension direction of the measuring element main body contact | abutted at the both ends of a clearance gap in the measuring apparatus of the other modification of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Measuring apparatus 2 Case main body 4 Spindle 31 Movement amount detection means 32 Calculation control means 41 Holder attachment part 51 Movable measuring element (measuring element)
52 Fixed Measuring Point (Measuring Point)
61 Display part 100 Crevice 101,102 End part (measurement site)
411 Holding surface 511, 711, 911, 1011 Measuring element main body 511B Tip 511C Base end 512 Holder 521, 721, 921, 1021 Measuring element main body 521B Tip 521C Base end 522 Holder 911A, 921A Taper CL vernier caliper (thickness) Measuring instrument)
J1, J2 Jaw PX Preset value T1, T2 Deflection

Claims (8)

A pair of measuring elements whose front ends are in contact with both ends between the measurement parts of the case main body and the object to be measured and can be moved close to each other, and a movement amount for detecting a relative movement amount between the base ends of the pair of measuring elements A measurement apparatus comprising: a detection unit; and an arithmetic control unit that calculates a dimension between the measurement sites based on a detection value by the movement amount detection unit,
The probe extends from the base end toward the tip,
The calculation control means calculates a dimension between the measurement parts from a predetermined calculation formula based on a deflection amount due to contact of the measuring element with the measurement part and the detection value, Measuring device. The measuring apparatus according to claim 1,
The true value of the dimension between the measurement parts is Y, the detection value by the movement amount detecting means is X, the length from the contact position of the measurement element to the measurement part to the proximal end of the measurement element is L, The elastic coefficient of the measuring element is E, the section modulus of the measuring element is I, the spring constant of the spring that biases the measuring element in the direction of separation from each other is k, and the constant is c, the L, E, I are identical to each other, and
A is {1- (2 kL ³ / 3EI)},
If B is {-(2L ³ / 3EI) c},
The calculation formula for obtaining Y is:
Y = AX + B
It is represented by the measuring device characterized by the above. In the measuring apparatus according to claim 1 or 2,
The case main body includes a display unit on which the calculated value calculated by the arithmetic control unit is displayed, and a spindle that is provided on the case main body so as to be movable in the axial direction and to which one of the measuring elements is attached.
The measuring element includes a measuring element main body that comes into contact with the measurement site, and a holder that is detachably provided on the measuring element main body.
At the end of the spindle, there is provided a holder mounting portion on which the holder is detachably provided. The holder mounting portion has a plurality of flat pressing surfaces along the axial direction of the spindle around the shaft. Formed,
The holder is positioned and fixed to any one of the pressing surfaces, and the orientation with respect to the display unit can be changed. The measuring apparatus according to any one of claims 1 to 3,
The measuring device is characterized in that a portion of the cross-sectional shape with respect to the extending direction that is in contact with the measurement site is convex. The measuring apparatus according to any one of claims 1 to 4,
The measuring element has a wedge shape in which a cross-sectional shape with respect to the extending direction is tapered from one end to the other end, a tapered portion in the wedge shape is opposed to the measurement site, and the one ends of the pair of measuring elements are Is a measuring device characterized by being close to each other. A pair of measuring elements provided so as to be close to and away from each other and extending from the proximal end toward the distal end are brought into contact with both end portions between the measurement parts of the object to be measured, respectively, so that the bases of the pair of measuring elements are A measurement method for detecting a relative movement amount between ends and calculating a dimension between the measurement sites based on the detected value.
A measurement method characterized in that a dimension between the measurement parts is calculated from a preset calculation formula based on a deflection amount caused by contact of the measuring element with the measurement part and the detection value. The measurement method according to claim 6,
The measuring element is formed such that the dimensions of the measuring element in the approaching / separating direction are equal to each other,
Aligning the positions of the measuring elements in the approaching and separating directions of the measuring elements,
A measuring method comprising: performing presetting in a state where the measuring element is sandwiched from both sides in the approaching / separating direction of the measuring element and the position thereof is fixed. The measurement method according to claim 7,
In a state where the positions of the measuring elements in the approaching and separating directions of the measuring elements are aligned,
Measuring the dimensions of the measuring element in the proximity and separation direction by sandwiching the measuring element between the jaws of a thickness measuring instrument having a pair of jaws,
A measurement method characterized by using a measurement value measured by the thickness measuring instrument as a preset value.

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