JP2004028844A - Measuring instrument for measuring outside diameter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily and accurately measure an outside diameter of a workpiece. <P>SOLUTION: This instrument is provided with a fixed side block gage 40 fixed to a base 30, a movable side block gage 60 fixed to a sub-block 50 provided to be approached and separated to/from the base 30, a probe 70 provided to allow contact on a reverse face of the fixed face in the movable side block gage 60, and a measuring probe 71 for outputting a displacement amount of the probe 70 to a display. Two opposed planes of the respective fellow block gages 40,60 are arranged to be brought into a parallel condition, in the instrument. The outside diameter of the workpiece is measured accurately because the workpiece is sandwiched between the two parallel planes to be measured by the measuring probe 71. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a technique for measuring the outer diameter of an object to be measured, and more particularly to an outer diameter measuring apparatus suitable for measuring the diameter (outer diameter) of an object to be measured having a circular cross section such as a cylinder, a cylinder, or a sphere.
[0002]
[Prior art]
The diameter (outer diameter) of a cylinder, a cylinder, a sphere, or the like is measured by measuring a linear distance between measurement points on the opposite side by 180 degrees, that is, between vertices of an arc part.
Conventionally, an object to be measured is placed on a flat surface, and a probe of a length measuring probe is brought into contact with a vertex of one of the circular arc portions to perform measurement.
[0003]
[Problems to be solved by the invention]
However, in such a conventional outer diameter measuring method, it is difficult to abut the probe on the vertex of one of the circular arc portions of the measuring object, and considerable skill is required, resulting in poor workability. Specifically, the lower end of the measurement probe is set in a rounded shape at a position where it comes into light contact with the measurement object, the measurement object is moved back and forth, and its peak value is picked up to make the maximum dimension of the measurement object. However, since a radial force is applied to the measurement probe, and a point contact occurs, which is affected by the surface condition of the contact portion between the probe and the measurement target, there is a problem that it is difficult to obtain a precise measurement value. . There is also a method in which the probe is brought into contact with a measurement target placed directly below the probe with the lower end of the measurement probe as a plane, but in this case, a reference surface supporting the measurement target on the lower surface of the measurement probe is used. And a perpendicularity with respect to the probe center line is not provided, a moment is applied to the measurement probe during measurement, and the measurement accuracy is not stable.
On the other hand, as a measuring instrument that realizes a more precise measurement accuracy, a measuring instrument using laser interference is known. In this case, the refractive index of a space through which a laser passes is kept stable, that is, air is measured. It is difficult to suppress changes in temperature, humidity, atmospheric pressure, fluctuations, and the like, and therefore special equipment is required, resulting in high equipment costs.
[0004]
The present invention has been made in view of the above points, and is a measuring instrument by mechanical means using a measuring probe that does not require special equipment such as a measuring instrument using laser interference, but the laser interference is measured. An object of the present invention is to provide an outer diameter measuring device capable of stably obtaining a precise measuring accuracy comparable to a measuring device used.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present inventors have focused on the following points and completed the present invention.
(1) The object to be measured can be measured between two planes formed by a block gauge having a high flatness, and the measurement surface of the object to be measured is brought into line contact with an adjustable constant measurement force, thereby making the measurement surface Suppress variations in measured values due to the effects of changes in surface conditions.
(2) A configuration in which the measurement probe is not directly in contact with the measurement target and can be set via the block gauge at a position in accordance with the "Abbe principle" without holding the measurement target by hand, thereby enabling The radial component or moment applied to the measurement probe is set to “0” to stabilize the measurement accuracy.
(3) When the measurer sets the measurement target at the measurement position, it is avoided that the heat of the hand is transmitted to the measurement target to affect the dimensions of the measurement target.
That is, in the present invention according to claim 1, an apparatus for measuring the outer diameter of the object to be measured,
A fixed block gauge fixed to the base,
A movable-side block gauge fixed to a movable body provided detachably with respect to the base;
It comprises a measuring probe provided so as to be able to contact the opposite surface of the movable body to the fixed surface of the movable block gauge, and a measuring probe for outputting the displacement of the measuring probe to a display device,
The two opposing planes of the block gauges are arranged so as to be parallel to each other, and the displacement of the movable body when the object to be measured is sandwiched between the two planes is measured by the measurement probe. Provided is an outer diameter measuring device for determining an outer diameter of an object.
According to the second aspect of the present invention, the outer diameter of the master member is stored in advance, and the difference between the object to be measured and the master member is output by the measurement probe. An outer diameter measuring device according to the above is provided.
According to the third aspect of the present invention, two opposing planes of the fixed block gauge and the movable block gauge that sandwich the object to be measured are constituted by an upper surface of the fixed block gauge and a lower surface of the movable block gauge. And
The outer diameter measuring device according to claim 1 or 2, wherein a measuring element of the measuring probe is provided so as to be displaceable in a vertical direction.
According to the fourth aspect of the present invention, the movable body is provided to be movable in the vertical direction, and includes a counterweight connected to the movable body via a string member disposed around a pulley. 4. An outer diameter measuring apparatus according to claim 3, wherein the measuring force applied to the object to be measured is adjusted by adjusting the weight of the counterweight.
According to the fifth aspect of the present invention, the measurement position of the measurement target is regulated by bringing the measurement target or a work carrier supporting the measurement target into contact with any one of the periphery of the fixed-side block gauge. Equipped with a work stopper with a contact surface,
The mounting position of the work stopper in the front-rear direction is adjustable, and the position of the contact surface on the upper surface of the fixed-side block gauge is set to a depth corresponding to the radius of the measurement object with respect to the center of the measurement probe. The outer diameter measuring device according to claim 3 or 4, wherein the outer diameter measuring device is provided offset to the side.
In the present invention according to claim 6, a groove is provided at a portion facing the fixed block gauge, and a support portion capable of supporting the measurement target is provided, and the measurement target is supported by the support. A work carrier capable of moving forward from the front of the fixed-side block gauge so that the fixed-side block gauge is housed in the groove, and disposing an object to be measured on the upper surface of the fixed-side block gauge. An outer diameter measuring device according to any one of claims 3 to 5 is provided.
In the present invention according to claim 7, when the work carrier is advanced, the height of the bottom surface of the support portion adjacent to the fixed block gage is formed to be lower than the height of the fixed block gage. An outer diameter measuring device according to claim 6, wherein
In the present invention according to claim 8, at least a means for surrounding the fixed-side block gauge and the movable-side block gauge on which the measurement target object to be measured is disposed, and preventing or invading dust is provided. An outside diameter measuring device according to any one of claims 1 to 7, further comprising a clean room portion.
[0006]
(Action)
According to the outer diameter measuring apparatus of the present invention, the object to be measured is sandwiched between two opposing planes of each block gauge, and the displacement amount of the movable body at that time is measured by the measuring probe, and the measurement is performed. Find the outer diameter of the object.
As described above, since the measurement target is sandwiched between the two parallel planes of each block gauge, each block gauge always contacts one vertex and the other vertex of the measurement target. Therefore, the outer diameter of the measurement object can be easily and accurately measured.
According to the second aspect of the present invention, since the master member is provided, the outer diameter is stored in advance, and the difference between the object to be measured and the master member is output, the outer diameter can be measured more accurately. can do.
According to the third aspect of the present invention, the two opposing planes for sandwiching the object to be measured in each block gauge are the upper surface and the lower surface, and the measuring probe of the measuring probe is provided so as to be displaceable in the vertical direction. It can be measured simply by placing an object on the fixed block gauge.
According to the fourth aspect of the present invention, by providing the counterweight for adjusting the measuring force, it is possible to prevent a subtle deformation of the object to be measured and improve the measurement accuracy.
According to the fifth aspect of the present invention, the position of the contact surface of the work stopper is shifted by the radius of the object to be measured, so that the position can be easily set to a position in accordance with the "abbe principle". Can be easily positioned on the plumb line of the tracing stylus, and the measurement accuracy is stabilized.
According to the sixth aspect of the present invention, by using the predetermined work carrier, it is possible to prevent a dimensional change of the measurement object due to heat transfer to the measurement object caused by being held by the measurer by hand. , Measurement accuracy is improved.
According to the present invention, since the bottom surface of the support portion of the measurement object is formed lower than the height of the fixed-side block gauge, the force supporting the work carrier is relaxed, that is, When the object is supported by the hand, the user releases the hand to place the object to be measured on the fixed-side block gauge, and then the support part is separated from the object to be measured. Therefore, the work carrier can be easily removed simply by pulling it toward the user.
According to the eighth aspect of the present invention, by providing the clean room portion, dust and the like can be eliminated, and the measurement accuracy is further improved.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in more detail based on the embodiments shown in the drawings.
1 to 3 show the overall structure of the outer diameter measuring device according to the present embodiment. FIG. 1 is a side view, FIG. 2 is a plan view, and FIG. 3 is a front view. The outer diameter measuring device 10 is electrically connected to a base 30, a fixed-side block gauge 40, a sub-block 50 as a movable body, a movable-side block gauge 60, a measuring probe 71 having a tracing stylus 70, and a measuring probe 71. The display device 160 is provided. Reference numeral 20 denotes an object to be measured (hereinafter, referred to as “work”).
[0008]
The base 30 is formed in a substantially rectangular parallelepiped shape, and rubber feet 31 are fixed to four corners at the bottom. This is to insulate vibrations from a table or a floor on which the apparatus is mounted. A substantially rectangular parallelepiped fixed block gauge 40 is fixed to the upper surface of the base 30, and a portal-shaped support frame 80 is fastened by bolts 81.
[0009]
The sub-block 50 as a movable body is provided so as to be able to be separated from and attached to the base 30, and the lower surface of the sub-block 50 is opposed to the fixed-side block gauge 40 and has a substantially rectangular parallelepiped movable shape. The side block gauge 60 is fixed. Therefore, in the present embodiment, two opposing planes of the fixed block gauge 40 and the movable block gauge 60 that sandwich the work 20 are configured by the upper surface of the fixed block gauge 40 and the lower surface of the movable block gauge 60. Will be.
[0010]
An adjustment mechanism for adjusting the vertical movement of the sub-block 50 is provided on a side portion of the support frame 80. This adjustment mechanism rotates a fixed piece 83 attached to the side of the support frame 80, a movable piece 54 attached to the side of the sub-block 50, and a rotary operation part 84 having a groove formed in the peripheral surface. By doing so, the shaft 85 at the distal end moves forward and backward, and the forward and backward member 86 supported by the fixed piece 83 and the lower end of the shaft 85 of the forward and backward member 86 are fixed to the lower surface of the movable piece 54. And a contact shaft 55 that comes into contact therewith.
[0011]
Therefore, when the rotation operation portion 84 of the advance / retreat member 86 is rotated to cause the distal end shaft portion 85 to advance / retreat, the movable piece 54 moves up and down, the sub-block 50 moves up and down, and the movable side The vertical position of the block gauge 60 is adjusted.
[0012]
On the other hand, a measurement probe 71 is provided above the sub-block 50. The measurement probe 71 includes a probe 70 that can abut on a surface of the sub-block 50 opposite to the fixed surface of the movable block gauge 60 (that is, the upper surface of the sub-block 50). Is output to the display device 160.
[0013]
The tracing stylus 70 of the measuring probe 71 is provided so as to be displaceable in the vertical direction, and more specifically, the distal end surface of the tracing stylus 70 contacts the plate-shaped block gauge 56 fitted on the upper surface of the sub-block 50. Have been. The measurement probe 71 is supported by a holder 72, and the holder 72 is supported on a support frame 80 via a bracket 73 so as to be slidable up and down. An adjusting bolt 76 is attached to a projecting piece 75 protruding from an upper portion of the bracket 73, and a tip of the adjusting bolt 76 is connected to the holder 72. Therefore, by rotating the adjustment bolt 76 to adjust the vertical position of the holder 72, the measuring probe 71 moves in the vertical direction, and the vertical position can be adjusted.
[0014]
The sub-block 50 is provided movably in the vertical direction as described above, and is connected to the counterweight 93 via a string member 92 such as a wire disposed around the pulleys 90 and 91. By adjusting the weight of the counterweight 93, the measuring force applied to the work 20 can be adjusted.
More specifically, a support member 100 having an L-shaped angle formed in a substantially T-shaped side surface is fixed to an upper portion of the support frame 80 by bolts 101, and pulleys 90 are provided at both ends of the support member 100, respectively. , 91 are provided rotatably. A string member 92 is looped between the two pulleys 90 and 91.
One end of the string member 92 is fastened to the upper surface of the sub-block 50 via a connector 94, and the other end is fastened to a suspended counterweight 93 via a connector 95. An adjustment weight 97 is detachably attached to the bottom of the counterweight 93 via a rod 96.
[0015]
Further, as shown in FIGS. 4 to 6, the work 20 and / or the work carrier 110 are located anywhere around the fixed block gauge 40, and in this embodiment, located above the fixed block gauge 40. A workpiece stopper 120 having contact surfaces 120a and 120b for regulating the measurement position of the workpiece 20 by contact with the workpiece 20 (see FIGS. 9B and 9C). A carrier base 130 that supports the work carrier 110 slidably back and forth is attached.
[0016]
To describe these in more detail, the carrier base 130 is provided on the base 30 so as to protrude forward (to the left in FIG. 4) on the base 30 as shown in FIGS. As shown in the drawing, each of the opposing side portions 131 is formed in a substantially U-shape in which one ends thereof are connected by a connecting portion 132. At the end of each opposing side 131 opposite to the connecting part 132, a wide part 134 wider than other parts is formed, and the facing interval between the wide parts 134 is larger than that between other parts. It is getting smaller.
As shown in FIGS. 4 and 6, the carrier base 130 is fixed to the base 30 by bolts 136 and 138, with the connecting portion 132 side protruding forward through a substantially L-shaped bracket 137.
[0017]
As shown in FIG. 8, the work carrier 110 is formed in a substantially U-shape including a pair of opposed sides 111 and a connecting portion 112 that connects the base ends of the opposed sides 111. The space therebetween is a groove 113 for accommodating the fixed-side block gauge 40. The bottom portion 114 of the work carrier 110 is formed in a shape protruding with a width smaller than the distance between the outer surfaces of the pair of opposed side portions 111 located on the upper side. It is slidably fitted between the parts 131.
[0018]
On the open end side of the opposite side portion 111 of the work carrier 110, a step portion 115 as a support portion for supporting the work 20 such as a rod member having a circular cross section is formed. The substantially vertical surface 115A of the step portion 115 is inclined at a predetermined angle, for example, about 5 degrees, and the upper end is inclined backward. The bottom surface 115B is inclined at a predetermined angle, for example, about 5 degrees. Each is formed in the shape of a lower inclined surface. The work carrier 110 having such a structure is advanced from the front of the fixed-side block gauge 40 so that the fixed-side block gauge 40 is accommodated in the groove 113 while the work 20 is supported on the step portion 115. The work 20 can be arranged on the upper surface of the fixed block gauge 40. The height of the bottom surface 115B of the step portion 115 is formed so as to be slightly lower than the height of the fixed-side block gauge 40 when the work carrier 110 is set on the carrier base 130. After pushing and carrying the work 20 onto the fixed-side block gauge 40, the work carrier 110 can be removed by simply pulling the work carrier 110 forward, leaving the work 20 on the upper surface of the fixed-side block gauge 40. .
[0019]
As shown in FIG. 9, the work stopper 120 is formed in a substantially U-shape in plan view integrally including a pair of opposed sides 121 and a connecting portion 122 that connects the base ends of the opposed sides 121 together. A long hole 123 is formed in the front-rear direction at a position near the base end from a substantially central portion in the longitudinal direction of the opposite side portion 121. As shown in FIGS. 4 and 5, bolts 124 are inserted into the elongated holes 123, respectively. The bolt 124 is fastened to the screw hole 135 of the carrier base 130 shown in FIG.
Therefore, if the work stopper 120 is placed on the upper surface of the carrier base 130 and the bolt 124 is loosened, the work stopper 120 can be slid back and forth. By tightening the bolt 124, the work stopper 120 is moved at a predetermined sliding position to the carrier base 130. Can be fixed to
The position of the contact surface 120 a on the upper surface of the fixed-side block gauge 40 of the work stopper 120 is offset to the rear by a length corresponding to the radius of the work 20. That is, when the work 20 or the work carrier 110 comes into contact with the contact surface 120a or 120b, the edge of the work 20 passes through a position on a vertical line passing through the tracing stylus 70 of the measurement probe 71, and the radius of the work 20 It is offset so that it stops at the back.
[0020]
Next, a method of measuring the outer diameter of the work 20 using the outer diameter measuring device 10 will be described. First, the position of the work stopper 120 is adjusted by moving the work stopper 120 in the front-rear direction, and the work stopper 120 is shifted to the far side by a distance corresponding to the radius of the work 20. Next, the work 20 is placed on the step portion 115 of the work carrier 110 and is pushed backward. When the work carrier 110 is moved forward, the fixed block gage 40 is accommodated in the groove 113, so that the work 20 placed on the step 115 is transferred to the fixed block gage 40 as it is. After the work 20 is placed on the upper surface of the fixed block gauge 40, the work carrier 110 is pulled toward the user. As described above, the step 115 of the work carrier 110 is formed slightly lower than the height of the upper surface of the fixed-side block gauge 40. It can be easily removed while remaining on top.
As described above, the work 20 placed on the fixed-side block gauge 40 has the work stopper 120 offset by a predetermined amount to the back side, and thus the center of the measurement element 70 of the measurement probe 71 and the work The center (axis) of 20 substantially coincides with the center.
[0021]
Next, the rotation operation section 84 of the advance / retreat member 86 is operated to lower the sub-block 50, lower the movable-side block gauge 60, and sandwich the work 20 between two opposing planes of the respective block gauges 40, 60. The outer diameter of the work 20 is measured from the displacement amount of the sub-block 50 measured by the measurement probe 71. The outer diameter of the work 20 measured by the measurement probe 71 is output to the display device 160 indicated by an imaginary line in FIG.
[0022]
In this case, as a method of measuring the outer diameter of the work 20, a state where the movable block gage 60 and the fixed block gage 40 are joined is set on the zero scale of the display device 160, and the work 20 actually measured is set. Can be directly measured within the effective stroke range of the measuring probe, or the outer diameter of the master member can be stored in advance and the displacement amount of the measuring element 70 of the measuring probe 71 (sub-block A method of outputting a difference between the master member and the work 20 to be measured can be adopted as the (amount of displacement of 50).
[0023]
According to the outer diameter measuring apparatus 10 having such a configuration, since the work 20 having a circular cross section is sandwiched between two parallel planes of the block gauges 40 and 60, the work 20 always comes into contact with one vertex of the work 20 and the other vertex. In addition, the outer diameter of the work 20 can be easily and accurately measured.
[0024]
On the other hand, if the workpiece is a sphere or has a dimension smaller than the width of the fixed block gauge 40, the workpiece 20 does not ride on the step 115 of the work carrier 110 or falls off the step 115. This type of work carrier 110 cannot be used.
[0025]
Therefore, as the work carrier in this case, as shown in FIG. 10, it is preferable to use a type that is left at the measurement location together with the work. The work carrier 140 shown in FIG. 10 includes a bottom portion 143 that is slidably fitted between the opposing sides 131 of the carrier base 130, and an upper wall portion 141 provided above the bottom portion 143. Has a groove 144 formed at a substantially central portion thereof to accommodate the fixed-side block gauge 40. Further, a work support hole 145 as a support portion for setting the work 150 is formed through the top end of the upper wall 141. As shown in FIGS. 10C and 10D, the work support hole 145 includes an upper large-diameter portion 145A and a lower small-diameter portion 145B. For example, when the work 150 is a sphere, The work 150 inserted into the support hole 145 is supported by the small diameter part 145B.
[0026]
The work carrier 140 advances along the opposing side 131 of the carrier base 130 when the bottom 143 is inserted between the opposing sides 131 of the carrier base 130 and the work 150 such as a sphere is set in the work supporting hole 145. Let it. When an arbitrary portion of the work carrier 140, for example, the tip of the upper wall 141 or the tip of the bottom 143 contacts the contact portions 120a and 120b of the work stopper 120, the work 150 is placed on the fixed block gauge 40. Be placed. Since the work stopper 120 is offset to the rear side by a predetermined amount, the work stopper 120 is set at a predetermined measurement position with the center of the tracing stylus 70 of the measurement probe 71 and the center of the work 150 substantially coincide.
[0027]
According to the work carrier 140, since the work 150 is supported by the work support hole 145 formed therethrough, a portion of the work 150 protruding from the lower small-diameter portion 145B and the upper large-diameter portion 145A are formed. The fixed-side block gauge 40 and the movable-side block gauge 60 can come into contact with the protruding portion, and the outer diameter of the work 150 can be measured without removing the work carrier 140 at the measurement position. .
[0028]
Note that, needless to say, the present invention is not limited to the above embodiment. For example, the work can be directly disposed on the upper surface of the fixed-side block gauge 40 without using the work carriers 110 and 140 that transport the work. However, when the accuracy of measuring the outer diameter of the work is required in units of microns or sub-microns, the above-mentioned dimensional change of the object to be measured due to heat transfer caused by touching with the hand is required. It is preferable to use the work carriers 110 and 140 as described above, and by using the above-described work carriers 110 and 140, there is an advantage that it is easy to accurately arrange a work at a predetermined measurement position.
[0029]
In addition, a clean room unit (not shown) provided with means for preventing intrusion and discharge of dust so as to surround the fixed-side block gauge 40 and the movable-side block gauge 60 in which a workpiece to be measured is disposed. Can also be provided. As a result, adhesion of dust can be more effectively prevented, which contributes to improvement of measurement accuracy.
[0030]
【The invention's effect】
According to the outer diameter measuring device of the present invention, since the object to be measured is sandwiched between two parallel planes of the fixed-side block gauge and the movable-side block gauge, it is necessary to make sure that one apex and the other apex of the object are abutted. Thus, the outer diameter of the object to be measured can be easily and extremely accurately measured. In addition, the use of a work carrier or the like makes it extremely easy to dispose the object to be measured at the measurement position, so that the outside diameter can be measured stably with extremely high accuracy without skill.
[Brief description of the drawings]
FIG. 1 is a side view for explaining a configuration of an outer diameter measuring device according to an embodiment of the present invention.
FIG. 2 is a plan view of the outer diameter measuring device of the embodiment.
FIG. 3 is a front view of the outer diameter measuring device of the embodiment.
FIG. 4 is a side view showing a relationship between a carrier base, a work stopper, and a work carrier in the outer diameter measuring device of the embodiment.
FIG. 5 is a plan view showing a relationship between a carrier base, a work stopper, and a work carrier according to the embodiment.
FIG. 6 is a front view showing a relationship between a carrier base, a work stopper, and a work carrier according to the embodiment.
FIGS. 7A and 7B are diagrams showing details of the carrier base of the embodiment, wherein FIG. 7A is a plan view and FIG. 7B is a side view.
FIGS. 8A and 8B are diagrams showing details of the work carrier of the embodiment, wherein FIG. 8A is a plan view, FIG. 8B is a side view, and FIG.
9A and 9B are diagrams showing details of the work stopper according to the embodiment, wherein FIG. 9A is a plan view, FIG. 9B is a side view, and FIG. 9C is a cross-sectional view of FIG. It is.
10A and 10B are diagrams showing details of another work carrier, wherein FIG. 10A is a plan view, FIG. 10B is a side view, FIG. 10C is a front view, and FIG. It is arrow A sectional drawing.
[Explanation of symbols]
Reference Signs List 10 outer diameter measuring device 20 work 30 base 40 fixed side block gauge 50 sub block 60 movable side block gauge 70 measuring element 71 measuring probe 90, 91 pulley 92 wire member 93 counter weight 110 work carrier 115 step 120 work stopper 130 carrier base 140 Work carrier 145 Work support hole 150 Work 160 Display device

Claims (8)

An apparatus for measuring the outer diameter of a measurement object,
A fixed block gauge fixed to the base,
A movable-side block gauge fixed to a movable body provided detachably with respect to the base;
It comprises a measuring probe provided so as to be able to contact the opposite surface of the movable body to the fixed surface of the movable block gauge, and a measuring probe for outputting the displacement of the measuring probe to a display device,
The two opposing planes of the block gauges are arranged so as to be parallel to each other, and the displacement of the movable body when the object to be measured is sandwiched between the two planes is measured by the measurement probe. An outer diameter measuring device for determining the outer diameter of an object. 2. The outer diameter measuring apparatus according to claim 1, wherein the outer diameter of the master member is stored in advance, and the difference between the object to be measured and the master member is output by the measurement probe. Opposing two planes sandwiching the object to be measured in the fixed block gauge and the movable block gauge are configured by an upper surface of the fixed block gauge and a lower surface of the movable block gauge.
The outer diameter measuring device according to claim 1, wherein a probe of the measurement probe is provided so as to be displaceable in a vertical direction. The movable body is provided movably in the vertical direction, and includes a counterweight connected to the movable body via a string member disposed around a pulley, and adjusts the weight of the counterweight. The outer diameter measuring device according to claim 3, wherein the measuring force applied to the measuring object is provided so as to be adjustable. A work stopper provided with a contact surface that is located at any one of the periphery of the fixed-side block gauge and regulates a measurement position of the measurement target by contacting the measurement target or a work carrier that supports the measurement target. And
The mounting position of the work stopper in the front-rear direction is adjustable, and the position of the contact surface on the upper surface of the fixed-side block gauge is set to a depth corresponding to the radius of the measurement object with respect to the center of the measurement probe. The outer diameter measuring device according to claim 3, wherein the outer diameter measuring device is provided offset to the side. A groove is provided at a portion facing the fixed-side block gauge, and a supporting portion capable of supporting the object to be measured is provided.In a state where the object to be measured is supported by the supporting portion, from the front of the fixed-side block gauge, A work carrier capable of moving forward so that the fixed block gage is accommodated in the groove and disposing an object to be measured on the upper surface of the fixed block gage. The outer diameter measuring device according to 1. The height of a bottom surface of the support portion adjacent to a fixed block gauge when the work carrier is advanced is formed to be lower than a height of the fixed block gauge. 6. The outer diameter measuring device according to 6. At least a clean room section surrounding the fixed block gauge and the movable block gauge on which the measurement object serving as a measurement site is disposed, and provided with means for preventing or discharging dust from entering is provided. The outer diameter measuring device according to claim 1.

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