JP5925351B1 - 3D shape measuring device - Google Patents

Abstract

To provide a three-dimensional shape measuring apparatus capable of improving operability when a base is moved by pulling a feed operation rod. SOLUTION: A base 10, a head 60 movable along a column 50, an arm 70 supported so as to be movable on the head, and a column are provided on the base in parallel, and the upper and lower ends are both supported. A feed operation rod 20 that is rotatably supported and rotatable about a rotation axis, a feed guide roller 11 that urges the base to the guide rail 630, and a central shaft member 21 to which the rotation of the feed operation rod is transmitted. In the three-dimensional shape measuring apparatus 1 having a rotation transmission mechanism 29 that communicates with and transmits rotation, a rotation transmission position for transmitting rotation between the feed operating rod and the central shaft member, and a central shaft member The feed operation rod can be moved between the rotation non-transmission positions where rotation cannot be transmitted between them, and a switching mechanism that switches between transmission / non-transmission of rotation between the feed operation rod and the central shaft member is provided . [Selection] Figure 1

Description

  The present invention relates to a three-dimensional shape measuring apparatus.

  Patent Document 1 discloses a three-dimensional shape measuring apparatus that measures the shape of an object to be measured in three dimensions using a measurement probe that can move in three axis directions (X axis, Y axis, and Z axis).

Japanese Patent Application Laid-Open No. 08-014807

  As shown in FIG. 5, a three-dimensional shape measuring apparatus 500 according to a conventional example has a surface plate 600 having a predetermined area on which an object to be measured (not shown) is placed. A feed groove 610 extending linearly along the side edge 611 of the surface plate 600 is opened on the upper surface 600 a of the surface plate 600, and a portion between the side edge 611 and the feed groove 610 in the surface plate 600. The guide rail 612 moves the base 510 in the X-axis direction.

  In the base 510, a column 515 extending linearly in the vertical direction (Z-axis direction) with respect to the upper surface 600a of the surface plate 600 is provided, and the head 520 moving in the Z-axis direction along the column 515 is measured. An arm 530 having a probe 540 at its tip is provided to be movable in the Y-axis direction.

The base 510 has two guide rollers 511 and 512 that hold the guide rail 612. When the base 510 moves in the X-axis direction, the guide rollers 511 and 512 roll according to the amount of movement of the base 510. It is supposed to be.
The rotation of the guide rollers 511 and 512 is transmitted to a feed operation bar 550 rotatably supported by the base 510 via a timing belt (not shown), and the base 510 moves in the X-axis direction. The amount and the rotation amount of the feed operation rod 550 are changed in conjunction with each other.

  Therefore, in the three-dimensional shape measuring apparatus 500, fine adjustment of the position in the X-axis direction of the three-dimensional shape measuring apparatus 500 can be performed by rotating the feed operation rod 550.

  However, when the position of the three-dimensional shape measuring apparatus 500 is displaced in the X-axis direction, the feed operation rod 550 rotates in conjunction with it. For example, when the position of the three-dimensional shape measuring apparatus 500 is greatly displaced in the X-axis direction. When the operator pulls the feed operation rod 550 in the X-axis direction as if the position of the three-dimensional shape measuring apparatus 500 is finely adjusted, the hand is taken by the rotating feed operation rod 550, It becomes difficult to move the three-dimensional shape measuring apparatus 500.

  This deteriorates the workability when moving the position of the three-dimensional shape measuring apparatus 500. Therefore, in the three-dimensional shape measuring apparatus having the feeding operation bar that rotates in conjunction with the movement, the feeding operation bar is used. It is required to make it easy to move.

The present invention provides a base that is movable along a track provided in the direction of the first axis of the mounting surface of the surface plate, and a direction of the second axis that is perpendicular to the surface plate surface along a column that stands on the base. A movable head, an arm supported by the head, movable in the direction of the third axis perpendicular to both the first axis and the second axis, and provided in parallel with the column on the base, A feed operation bar supported at its upper and lower ends so as to be rotatably supported by both ends, and rotatable about a rotation axis parallel to the second axis; a feed drive member for biasing the base along the track; In a three-dimensional shape measuring apparatus having a rotation transmission mechanism for transmitting rotation by communicating with a rotation transmission member to which rotation of a feed operation bar is transmitted , the feed operation bar is provided so as to be displaceable also in the rotation axis direction. together, switching transmission / non-transmission of rotation between the feed operating rod and the rotation transmitting member The Order switching mechanism provided in the switching mechanism, the rotation axis direction of the displacement of the feed control rod, and a transmission / non-transmission is switched configuration of rotation between the feed operating rod and the rotation transmitting member.

  According to the present invention, when the position on the surface plate of the three-dimensional shape measuring apparatus is greatly displaced, the movement of the three-dimensional shape measuring apparatus and the rotation of the feed operation rod can be prevented from being interlocked. In a three-dimensional shape measuring apparatus having a feed operation bar that rotates in conjunction with each other, movement using the feed operation bar can be performed without a sense of incongruity.

It is a figure explaining the three-dimensional shape measuring apparatus concerning embodiment. It is a figure explaining the structure of the upper support mechanism concerning an embodiment. It is a figure explaining the structure of the switching mechanism concerning embodiment. It is a figure explaining the switching mechanism concerning an embodiment. It is a front view explaining the three-dimensional shape measuring apparatus of a prior art example.

Hereinafter, the three-dimensional shape measuring apparatus 1 according to the embodiment will be described.
1A and 1B are diagrams for explaining a three-dimensional shape measuring apparatus 1 according to an embodiment. FIG. 1A is a perspective view showing an appearance of the three-dimensional shape measuring apparatus 1, and FIG. It is sectional drawing which cut | disconnected the surface plate 600 by A. FIG. In FIG. 1, X, Y, and Z axis directions are shown as indices indicating the moving direction of the measurement probe 80.
FIG. 2 is a cross-sectional view of the upper support mechanism 26, the lock mechanism 24, and the feed operation rod 20 taken along the surface B in FIG.
3A and 3B are views for explaining the structure of the switching mechanism 30. FIG. 3A is a cross-sectional view of the switching mechanism 30 taken along plane C in FIG. 1A, and FIG. 2A is a cross-sectional view taken along the line AA in FIG. 1C, and FIG. 3C is a cross-sectional view of the lock mechanism 23 taken along a plane D in FIG.
4A and 4B are diagrams for explaining the switching mechanism 30. FIG. 4A is an enlarged view of a region B in FIG. 3A, and FIG. 4B is an insertion hole 32b1 of the engaging pin 33 in FIG. It is a figure which shows the state which pulled out from and made the feed operation rod 20 into the free rotation state.

The three-dimensional shape measuring apparatus 1 includes a metal surface plate 600 on which an object to be measured (not shown) is placed on the upper surface (mounting surface 601), a guide rail 630 set on the surface plate 600, A base 10 movably provided in the X-axis direction along the guide rail 630, a column 50 erected from the upper surface 10 a of the base 10, and a head 60 provided movably in the Z-axis direction along the column 50 The head 60 includes an arm 70 movably provided in the Y-axis direction orthogonal to both the X-axis and the Z-axis, and a measurement probe 80 attached to the arm 70.
In the three-dimensional shape measuring apparatus 1, the measurement probe 80 is moved in the directions of three axes (X axis, Y axis, Z axis) by moving the base 10, the head 60, and the arm 70, respectively. In addition, the shape of the measurement object placed on the placement surface 601 is measured by measuring the coordinate value of the measurement probe 80 brought into contact with the measurement location on the surface of the measurement object.

As shown in FIG. 1A, in the surface plate 600 having a rectangular shape in plan view, the mounting surface 601 on which the object to be measured is mounted is a flat surface. A guide rail 630 is provided along one side wall 620.
The guide rail 630 is provided in a portion between the feed groove 610 linearly provided along the side wall 620 of the surface plate 600 and the side wall 620. The guide rail 630 is linear in the X-axis direction. Are formed with a predetermined width.

In the guide rail 630, a base 10 having a rectangular shape in plan view is provided so as to be movable in the X-axis direction.
The base 10 is provided in a direction in which the long side 10b of the base 10 is orthogonal to the X axis, and the lower side of the base 10 on the surface plate 600 side holds both sides of the guide rail 630 in the width direction. A pair of guide rollers 11 and 12 are provided (see FIG. 1B).
As shown in FIG. 1B, the rolling surfaces of the guide rollers 11 and 12 are biased by a biasing means (not shown), and the side edges in the width direction of the guide rollers 11 and 12 (feed of the guide rail 630). The side edge 610 a on the groove 610 side and the side wall 620 of the surface plate 600 are pressed against each other so that when the guide rollers 11 and 12 are rolled, the base 10 moves along the guide rail 630 in the X-axis direction. It has become.
The guide rollers 11 and 12 also roll when the base 10 itself is moved directly along the guide rail 630.

  In the base 10, a column 50 that guides the movement of the head 60 in the Z-axis direction is erected, and the column 50 is provided linearly in the vertical direction of the placement surface 601.

  An arm 70 is provided on the head 60 so as to be movable in the Y-axis direction, and a measurement probe 80 is attached to the tip of the arm 70.

A horizontal flange 90 extending in the Y-axis direction is fixed to the upper end of the column 50. The column 50 is connected to a substantially central portion in the longitudinal direction of the horizontal flange 90, and a tension extending upward from the base 10 along the column 50 is provided at the end of the horizontal flange 90 on the guide rail 630 side. The rod 92 is fixed.
The tension rod 92 has a linear shape along the column 50 and is provided to increase the upright rigidity of the column 50.

  In the three-dimensional shape measuring apparatus 1, a feed operation bar 20 for finely adjusting the position of the base 10 in the X-axis direction is provided on the opposite side of the tension rod 92 across the column 50. Is provided in parallel with the column 50. The upper end side of the feed operating rod 20 is rotatably supported by an upper support mechanism 26 that is suspended and fixed to a horizontal flange 90, and the lower end side is rotatable by a lower support mechanism 28 provided on the base 10. The upper and lower ends of the feed operation rod 20 are supported so as to be rotatable in a double-supported manner.

  As shown in FIG. 2, the upper support mechanism 26 that rotatably supports the upper end side of the feed operation rod 20 includes a cylindrical support member 26 a and a connection member 26 b, and the connection member 26 b is a support member. The member 26a is press-fitted into the end portion on the feed operation rod 20 side.

The connection member 26b is a member having a cylindrical shape that is thicker than the support member 26a. In the through hole 26b1 at the center of the connection member 26b, a bearing is provided at the lower part on the feed operation rod 20 side (lower side in FIG. 2). 26c and 26c are provided.
The bearings 26c and 26c are arranged at an interval in the axial direction of the central axis X1, and these bearings 26c and 26c are arranged so that one end side of the shaft member 20b connected to the upper end of the feed operation rod 20 is connected to the central axis X1. It is supported so as to be rotatable around and movable in the axial direction of the central axis X1.

Further, a lock mechanism 24 is fixed to the lower end of the connection member 26b, and one end side of the shaft member 20b passes through a through hole 241a provided in the base 241 of the lock mechanism 24.
When the lock lever (not shown) is rotated in the lock direction, the lock mechanism 24 reduces the inner diameter of the through-hole 241a, thereby allowing the feed operation rod 20 to rotate around the central axis X1 and move in the axial direction of the central axis X1. Being regulated.

The other end side of the shaft member 20b is inserted into the through hole 20a1 of the connection member 20a provided at the upper end of the feed operation rod 20. A bolt 20a2 that penetrates the connecting member 20a in the radial direction of the central axis X1 is in pressure contact with the outer periphery on the other end side of the shaft member 20b. The bolt 20a2 prevents the shaft member 20b from falling off the connecting member 20a. Has been.
Here, the connecting member 20a is fixed to the upper end of the feed operation rod 20 by press fitting, and relative rotation around the central axis X1 between the feed operation rod 20 and the shaft member 20b is restricted.

As shown in FIGS. 1A and 1B, the lower support mechanism 28 that rotatably supports the lower end side of the feed operating rod 20 includes a cylindrical member 27 fixed to the upper surface 10 a of the base 10, A central shaft member 21 rotatably supported inside the cylindrical member 27.
The cylindrical member 27 is provided in a direction along the Z axis, and the central shaft member 21 supported by the cylindrical member 27 is rotatable around the central axis X1 along the Z axis.

The lower end side of the central shaft member 21 passes through the cylindrical member 27 and is located in the base 10, and the pulley 25 of the rotation transmission mechanism 29 is connected to the lower end of the central shaft member 21.
The rotation transmission mechanism 29 includes a pulley 25 attached to the lower end of the central shaft member 21, a pulley 13 connected to the guide roller 11 of the base 10, a timing belt 14 wound around these pulleys 13, 25, The rotation transmission mechanism 29 transmits rotation between the pulley 25 that rotates integrally with the central shaft member 21 and the pulley 13 that rotates integrally with the guide roller 11. ing.

  Therefore, the movement of the base 10 in the X-axis direction and the rotation of the central shaft member 21 around the central axis X <b> 1 are interlocked by the rotation transmission mechanism 29.

  A lock mechanism 23 that restricts the rotation of the central shaft member 21 is provided at a position near the base 10 in the lower support mechanism 28. As shown in FIG. 3C, the lock mechanism 23 has a brake shoe 23a externally attached to the central shaft member 21, and when the lock lever 23b is rotated in the locking direction, the brake shoe 23a is centered. The shaft member 21 is tightened to restrict the rotation of the center shaft member 21 around the central axis X1.

Between the upper end of the central shaft member 21 and the feed operation rod 20, a switching mechanism 30 that switches between transmission / non-transmission of rotation between the feed operation rod 20 and the central shaft member 21 is provided.
When the center shaft member 21 and the feed operation rod 20 are connected by the switching mechanism 30 and the relative rotation impossibility between the feed operation rod 20 and the center shaft member 21 is restricted, the feed operation rod 20 and the center shaft member 21 are controlled. When the center shaft member 21 and the feed operation rod 20 are disconnected from each other and relative rotation between the feed operation rod 20 and the center shaft member 21 is allowed, Between the operation rod 20 and the central shaft member 21, the rotation cannot be transmitted.

  As shown in FIG. 3A, the switching mechanism 30 includes an engaging member 31 connected to the lower end of the feed operating rod 20, an engaged member 32 connected to the upper end of the central shaft member 21, and a center. And a cylindrical case 35 that rotatably supports the shaft member 21. Inside the case 35, the engaged member 32 and the engaging member 31 are arranged on the same central axis X1, and only the engaging member 31 is movable in the axial direction of the central axis X1 in this state. It has become.

  The case 35 is provided at the upper end of the cylindrical member 27 that houses the central shaft member 21, and is a square cylindrical case that is formed integrally with the cylindrical member 27. An accommodation space K having an inner diameter larger than the outer diameter of the central shaft member 21 is provided inside the case 35, and the engagement member 31 moves in the axial direction of the central axis X1 inside the accommodation space K. By doing so, the engaging member 31 and the engaged member 32 are engaged and disengaged.

The upper end side of the central shaft member 21 passes through a through hole 35a provided in the case 35 in the direction of the central axis X1, and is rotatably supported by bearings 38 and 38 provided in the through hole 35a.
In the case 35, an attachment portion 32c provided at the lower portion of the engaged member 32 is externally attached to the upper end of the central shaft member 21, and the engaged member 32 is attached in the radial direction. The central shaft member 21 is connected so as not to rotate relative to the central shaft member 21 by a bolt 32c1 penetrating therethrough.

A large-diameter portion 32a having a diameter larger than that of the attachment portion 32c is integrally provided on the upper portion of the attachment portion 32c, and a flange portion 32b extending radially outward is provided at an upper end portion of the large-diameter portion 32a. Is provided.
Bearings 36 and 36 arranged at intervals in the central axis X1 direction in the accommodation space K of the case 35 are in contact with the outer periphery of the large-diameter portion 32a, and the engaged member 32 (large-diameter portion 32a) is The inside of the case 35 is rotatably supported.

At the upper end portion of the large diameter portion 32a, the flange portion 32b is provided over the entire circumference in the circumferential direction around the central axis X1, and forms a ring shape when viewed from the axial direction of the central axis X1.
As shown in FIGS. 4A and 4B, the flange portion 32b has a predetermined thickness W in the axial direction of the central axis X1, and the engagement member 31 is formed on the upper surface of the flange portion 32b. An insertion hole 32b1 into which the engagement pin 33 on the side is inserted is opened.
When viewed from the axial direction of the central axis X1, a plurality of insertion holes 32b1 are provided at a second interval (for example, an interval of 18 °) in the circumferential direction around the central axis X1 (see FIG. 3B).

  As shown to (a) of FIG. 3, the engaging member 31 has the flange part 31b extended in the radial direction outer side in the middle position of the longitudinal direction (axial direction of the central axis X1) of the axial part 31a. Yes. The flange portion 31b is provided over the entire circumference in the circumferential direction around the central axis X1, and has a ring shape when viewed from the axial direction of the central axis X1.

  An upper side of the shaft portion 31 a from the flange portion 31 b is inserted into a through hole 22 a of a connection member 22 attached to the lower end of the feed operation rod 20. A set screw 22b that penetrates the connecting member 22 in the thickness direction is in pressure contact with the outer periphery of the shaft portion 31a located in the through hole 22a, and the falling of the engaging member 31 from the connecting member 22 is prevented by the set screw 22b. Is blocked by

A lower side of the flange portion 31b in the shaft portion 31a is an insertion portion 31c that is inserted into the large diameter portion 32a of the engaged member 32. The insertion portion 31c is a large diameter portion on the flange portion 31b side. 31c1 and the small diameter part 31c2 connected to the lower side of the large diameter part 31c1.
Bearings 34, 34 arranged at intervals in the central axis X <b> 1 direction inside the large-diameter portion 32 a of the engaged member 32 abut on the outer periphery of the insertion portion 31 c, and the engaging member 31 (large-diameter portion) 31c1) is supported inside the engaged member 32 so as to be rotatable around the central axis X1 and movable in the axial direction of the central axis X1.

  Further, a moderation groove 31c3 is formed over the entire circumference in the circumferential direction on the outer periphery on the distal end side of the small diameter portion 31c2 in the shaft portion 31a. The moderation groove 31c3 is formed in a V-groove shape in a cross-sectional view, and a plunger 39 that can be projected and retracted from the inner periphery of the large-diameter portion 32a of the engaged member 32 has a central axis in the moderation groove 31c3. It is engaged from the radial direction of X1.

In the embodiment, when the engaging member 31 is moved in a direction (downward in the figure) to engage with the engaged member 32, the small-diameter portion 31c2 of the engaging member 31 reaches a predetermined position in the direction of the central axis X1. When inserted into the engaged member 32, the plunger 39 is elastically engaged with the moderation groove 31c3 provided on the outer periphery of the small diameter portion 31c2, so that a sense of moderation is exhibited.
For this reason, the completion of engagement between the engaging member 31 and the engaged member 32 can be sensed by demonstrating this moderation feeling.

The flange portion 31b of the engaging member 31 is provided with a through hole 31b1 that passes through the flange portion 31b in the direction of the central axis X1. When viewed from the axial direction of the central axis X1, a plurality of through holes 31b1 are provided in the circumferential direction around the central axis X1 at first intervals (for example, 180 ° intervals), and each of the through holes 31b1 is engaged. The engagement pin 33 is press-fitted from the member 32 side and fixed.
Here, the installation interval (first interval, for example, 180 ° interval) of the engagement pins 33 in the circumferential direction around the central axis X1 in the engagement member 31 is the insertion hole 32b1 into which the engagement pins 33 are inserted. It is larger than the circumferential installation interval (second interval, for example, 18 ° interval) around the central axis X1 of the engaged member 32 (see FIG. 3B).

As shown in FIG. 4A, the engaging pin 33 has a cylindrical base portion 33a, and the distal end of the base portion 33a on the engaged member 32 side has an outer diameter larger than that of the base portion 33a. A small small diameter portion 33b is formed. The outer diameter of the small diameter portion 33b is smaller than the inner diameter of the insertion hole 32b1 of the engaged member 32.
A ring-shaped contact portion 33c extending radially outward is provided at the boundary between the base portion 33a and the small diameter portion 33b. The contact portion 33c is an outer portion larger than the inner diameter Rb of the through hole 31b1. It is formed with a diameter Ra.

Therefore, in a state where the engaging pin 33 is press-fitted into the through hole 31b1, the small diameter portion 33b of the engaging pin 33 protrudes from the lower surface of the flange portion 31b to the engaged member 32 side.
In the embodiment, the protrusion height Ha of the engagement pin 33 is such that the small diameter portion 31c2 side of the engagement member 31 is located in the moderation groove 31c3 on the outer periphery of the small diameter portion 31c2, and the plunger 39 on the engaged member 32 side is When inserted into the engaged member 32 until it is engaged, the small diameter portion 33b of the engaging pin 33 is set to a height that is inserted into the insertion hole 32b1 on the engaged member 32 side.
Therefore, the small diameter portion 33b of the engagement pin 33 on the engagement member 31 side is inserted into the insertion hole 32b1 on the engagement member 32 side, so that the engagement member 31 and the engagement member 32 are not relatively rotatable. To be connected.

Here, a ring-shaped peripheral edge portion 32b2 is provided at the upper end of the insertion hole 32b1 on the engaged member 32 side so that the opening diameter increases toward the upper side on the engaging member 31 side. Therefore, when the small diameter portion 33b of the engagement pin 33 is inserted into the insertion hole 32b1, the small diameter portion 33b of the engagement pin 33 is not aligned with the peripheral edge even if the positions of the small diameter portion 33b and the insertion hole 32b1 are slightly shifted. The portion 32b2 is guided into the insertion hole 32b1.
Further, the outer diameter Ra of the contact portion 33c of the engagement pin 33 and the outer diameter of the peripheral edge portion 32b2 of the insertion hole 32b1 are formed with a matching diameter, and the small diameter portion 33b of the engagement pin 33 is formed in the insertion hole 32b1. The contact portion 33c of the engagement pin 33 is seated on the peripheral edge portion 32b2 when inserted into the engagement pin 33, so that slight relative rotation around the central axis X1 of the engagement member 31 and the engaged member 32 is restricted. It has become.

  Further, the contact surface 33c1 of the contact portion 33c of the engagement pin 33 with the insertion hole 32b1 is curved to form an R shape, and the peripheral portion of the insertion hole 32b1 of the member 32 to be engaged is formed. The R-shaped contact surface 33c1 reduces the collision force when seated on the 32b2.

As shown in FIGS. 4A and 4B, a recessed groove 31 b 2 of the holding mechanism 41 is provided on the outer periphery of the flange portion 31 b of the engaging member 31.
The holding mechanism 41 holds the feed operating rod 20 at a position (rotation non-transmitting position) where rotation transmission is not performed with the central shaft member 21, and a groove 31b2 provided on the outer periphery of the flange portion 31b. And a lock pin 40 that penetrates the peripheral wall 35b of the case 35 in the radial direction and elastically engages the concave groove 31b2.

  The concave groove 31b2 is configured so that the lock pin 40 is elastically engaged when the feed operation rod 20 is disposed at a position (rotation non-transmission position) where rotation is not transmitted to the central shaft member 21. When the first groove 31b3 and the feed operating rod 20 are arranged at a position (rotation transmission position) for transmitting rotation between the central shaft member 21, the lock pin 40 is elastically engaged. 2 concave grooves 31b4.

Note that switching between the rotation transmission position and the rotation non-transmission position of the feed operation rod 20 is performed by the switching mechanism 30 described above.
Specifically, when the feed operation rod 20 is arranged at the rotation transmission position, the engagement pin 33 of the engagement member 31 connected to the feed operation rod 20 is engaged with the engaged member connected to the central shaft member 21. It is located outside the insertion hole 32b1 of 32, and is in a state where rotation transmission between the feed operation rod 20 and the central shaft member 21 cannot be performed.
When the feed operation rod 20 is arranged at the non-rotation transmission position, the engagement pin 33 of the engagement member 31 connected to the feed operation rod 20 is inserted into the insertion hole of the engaged member 32 connected to the central shaft member 21. It is in a state where the rotation transmission between the feed operation rod 20 and the central shaft member 21 can be performed by being positioned within 32b1.

The first groove 31b3 is provided adjacent to the lower side of the engaged groove 32 side of the second groove 31b4. The first groove 31b3 and the second groove 31b4 are It is formed over the entire circumference in the circumferential direction around the central axis X1.
Since the engaging member 31 provided with the first groove 31b3 and the second groove 31b4 rotates around the central axis X1 integrally with the feed operation rod 20, the engagement member 31 rotates around the rotation axis X1 of the feed operation rod 20. This is because the lock pin 40 can be engaged with the first concave groove 31b3 and the second concave groove 31b4 regardless of the angular position.

The lock pin 40 is provided through a through hole 35b1 that penetrates the peripheral wall 35b of the case 35 in the radial direction from the outer side to the inner side of the peripheral wall 35b.
A biasing member 35b2 for biasing the lock pin 40 in the insertion direction is provided in the through-hole 35b1, and the tip of the lock pin 40 protrudes from the inner periphery of the peripheral wall 35b by the biasing force of the biasing member 35b2. The tip that protrudes from the inner periphery of the peripheral wall 35b is brought into pressure contact with the groove 31b2 (the first groove 31b3 and the second groove 31b4) on the engagement member 31 side. Yes.
Here, in the engaged member 32, the engaging member 31 is provided so as to be movable in the axial direction of the central axis X1, and the engaging pin 33 is inserted into the insertion hole 32b1 to engage the engaging member 31 and the engaged member. The connection position (rotation transmission position: the position of (b) in FIG. 4) where the combined member 32 is connected so as not to be relatively rotatable, and the engagement pin 33 is positioned outside the insertion hole 32b1, and The engaging member 32 is provided so as to be movable between a non-connection position (a rotation non-transmission position: a position shown in FIG. 4A) in which relative rotation is allowed.
Therefore, the movement range in the direction of the central axis X1 of the feed operating rod 20 to which the engaging member 31 is connected is defined by the lock pin 40 engaged with the concave groove 31b2.

In the embodiment, when the feed operating rod 20 is moved upward to release the engagement between the engaging member 31 and the engaged member 32, the lock pin 40 is connected to the first groove 31b3 and the second groove 31b3. A direction in which the engaging member 31 and the engaged member 32 are connected so as not to rotate relative to each other by contacting the flat surface 31b7 on the first concave groove 31b3 side of the boundary wall 31b5 provided between the concave groove 31b4 and the groove 31b4. The movement of the feed operating rod 20 to the (lower side in the figure) is prevented (see FIG. 4B).
When the engaging member 31 and the engaged member 32 are connected so as not to rotate relative to each other, the feed operation rod 20 is moved downward by releasing the engagement of the lock pin 40 with the first concave groove 31b3. The engaging member 31 and the engaged member 32 can be connected so as not to be relatively rotatable.

Here, the surface on the second concave groove 31b4 side in the boundary wall portion 31b5 is a tapered surface 31b6 whose outer diameter increases toward the lower side on the engaged member 32 side. Therefore, when the feed operation rod 20 is moved upward from the rotation transmission position (position (a) in FIG. 4) where the relative rotation between the engaging member 31 and the engaged member 32 is restricted, the lock pin 40 is After being pushed up by the taper surface 31b6 (moved to the left in FIG. 4) and moved in a direction to release the engagement with the second groove 31b4 against the urging force of the urging member 35b2, The first concave groove 31b3 is adapted to engage with a flat surface 31b7 constituting the boundary wall portion 31b5 on the second concave groove 31b4 side. As a result, the feed operation rod 20 is disposed at the non-rotation transmitting position where the relative rotation between the engaging member 31 and the engaged member 32 is allowed.
Therefore, the rotation between the feed operation rod 20 and the central shaft member 21 can be made non-transmitted only by moving the feed operation rod 20 upward.

  Next, the case where the three-dimensional shape of a measurement object (not shown) is measured using the three-dimensional shape measuring apparatus 1 will be described.

First, the case where the feed operation rod 20 is rotated around the central axis X1 to finely adjust the position of the base 10 in the X-axis direction will be described.
Rotation in which the engaging member 31 and the engaged member 32 are disposed at the non-connecting position (see FIG. 4B) and the feed operation rod 20 does not transmit rotation with the central shaft member 21. In the case of being arranged at the transmission position, in order to release the engagement between the lock pin 40 and the first concave groove 31b3 of the engaging member 31, the lock pin 40 is pulled and the first concave groove 31b3 and Is moved in the direction of releasing the engagement (left direction in FIG. 4B).
When the engagement between the moved lock pin 40 and the first concave groove 31b3 is released, the feed operation rod 20 (engagement member 31) is moved by its own weight to the center shaft member 21 (engaged member 32) side. The engagement pin 33 (small diameter portion 33b) of the engagement member 31 is inserted into the insertion hole 32b1 of the engaged member 32, and the contact surface 33c1 of the engagement pin 33 is It sits on the peripheral edge 32b2 of the insertion hole 32b1 of the engaging member 32 (see (a) of FIG. 4).

  As a result, the engaging member 31 is disposed at the coupling position where the relative rotation with the engaged member 32 is restricted, and as a result, the feed operating rod 20 transmits the rotation with the central shaft member 21. It is arranged at (rotation transmission position).

Here, for example, when the engagement pin 33 is not inserted into the insertion hole 32b1 even if the lock pin 40 is operated even if the angular position in the circumferential direction around the central axis X1 of the engagement pin 33 and the insertion hole 32b1 is shifted. The rotation of the feed operating rod 20 about the central axis X1 makes it possible to match the position of the engagement pin 33 and the insertion hole 32b1 in the direction of the central axis X1 at a predetermined angular position. It is inserted into the hole 32b1. Thereby, the engaging member 31 and the to-be-engaged member 32 are connected so that relative rotation is impossible.
In the embodiment, since the engaging pins 33 are provided at intervals of 180 ° in the circumferential direction around the central axis X1, and the insertion holes 32b1 are provided at intervals of 18 ° in the circumferential direction around the central axis X1, at least a feeding operation is performed. By rotating the rod 20 around the central axis X1 by at least 18 °, the engagement pin 33 is inserted into any of the insertion holes 32b1.

  When the feed operation bar 20 moves downward, the plunger 39 is engaged with the moderation groove 31c3 of the engagement member 31, and a sense of moderation indicating that the feed operation bar 20 has moved to a predetermined position below is obtained. The operator can sensuously sense completion of engagement between the engaging member 31 and the engaged member 32.

  When the feed operation rod 20 is rotated around the central axis X1 in a state where the engagement member 31 and the engaged member 32 are connected so as not to rotate relative to each other, the rotation of the feed operation rod 20 causes the engagement member 31 and the covered member to rotate. It is transmitted to the central shaft member 21 through the engaging member 32. Then, the rotation of the central shaft member 21 is transmitted to the guide roller 11 via a rotation transmission mechanism 29 constituted by the pulleys 13 and 25 and the timing belt 14, and the base 10 is moved along with the rolling of the guide roller 11. It moves along the guide rail 630.

  Here, even if the rotation amount (rotation angle) of the feed operation rod 20 is small, the guide roller 11 rolls by an amount corresponding to the rotation angle of the feed operation rod 20. The amount of movement of the base 10 can be finely adjusted by the amount.

  After the position of the base 10 in the X-axis direction is determined, the lock mechanism 23 or the lock mechanism 24 is operated to lock the rotation of the central shaft member 21. Then, since the rolling of the guide roller 11 is fixed via the timing belt 14, it is possible to prevent the base 10 from moving in the X-axis direction.

Here, in a state where the engaging member 31 and the engaged member 32 are connected so as not to be relatively rotatable (the state shown in FIG. 4A), the position of the base 10 is once pulled by directly pulling the feed operation rod 20. When the base 10 is displaced a lot, the guide roller 11 rolls with the movement of the base 10, whereby the feed operation rod 20 rotates around the central axis X <b> 1. Then, when pulling the feed operation rod 20, the operator feels uncomfortable.
In such a case, as described below, the rolling of the guide roller 11 is not transmitted to the feed operation rod 20 so that the displacement of the base 10 and the rotation of the feed operation rod 20 are not linked.

First, the engaging member 31 is disposed at a coupling position where the relative rotation with the engaged member 32 is restricted, and the feed operating rod 20 transmits the rotation with the central shaft member 21 (rotation). When the feed operating rod 20 is lifted upward in the state where it is disposed at the transmission position (see FIG. 4A), it is elastically engaged with the second concave groove 31b4 of the engaging member 31. The lock pin 40 is slid in the second concave groove 31b4 toward the lower side on the first concave groove 31b3 side.
Here, in the boundary wall portion 31b5 provided between the first groove 31b3 and the second groove 31b4, the outer diameter of the second groove 31b4 increases toward the first groove 31b3. Therefore, the lock pin 40 slides along the tapered surface 31b6 as the feed operation rod 20 moves upward. As a result, the lock pin 40 and the second recessed groove 31b4 are in contact with each other. It will move in the direction of releasing the engagement (lower side of FIG. 4A).

And when the lock pin 40 gets over the boundary wall part 31b5, it will be elastically engaged with the 1st ditch | groove 31b3 side.
In the embodiment, when the lock pin 40 gets over the boundary wall portion 31 b 5, the engaging member 31 is arranged at a non-connected position in which relative rotation with the engaged member 32 is allowed, and the feed operation rod 20. However, it will be in the state (refer to (b) of Drawing 4) arranged at the position (rotation non-transmission position) which cannot transmit rotation between central axis members 21.

Therefore, at this point, when the upward movement of the feed operation rod 20 is finished, the feed operation rod 20 (engagement member 31) moves downward due to its own weight. However, when the lock pin 40 comes into contact with the surface (flat surface 31b7) on the second concave groove 31b4 side of the boundary wall portion 31b5 of the engagement member 31, the lower side of the feed operation rod 20 (engagement member 31). Movement to is restricted.
In the embodiment, when the lock pin 40 contacts the flat surface 31b7, the engaging member 31 is held in the non-connected position in which relative rotation with the engaged member 32 is allowed. 20 is held at a position where rotation cannot be transmitted to the central shaft member 21 (rotation non-transmission position).

  When the position of the base 10 is displaced in the X-axis direction by directly pulling the feed operation bar 20 in this state, the feed operation bar 20 does not rotate in accordance with the displacement of the position of the base 10, so that the operator feels uncomfortable. The position of the base 10 can be greatly displaced by pulling the feed operation rod 20 without any change.

Here, the X-axis direction, the Z-axis direction, and the Y-axis direction in the above embodiment correspond to the first axis direction, the second axis direction, and the third axis direction in the present invention.
The guide rail 630 in the above embodiment corresponds to the track in the present invention, the guide rollers 11 and 12 correspond to the feed driving member in the present invention, and the central shaft member 21 corresponds to the rotation transmission member in the present invention. Equivalent to.

As described above, in the embodiment,
(1) A base 10 movable along a track (guide rail 630) provided in the direction of the first axis (X axis) of the mounting surface 601 of the surface plate 600, and a column 50 standing on the base 10 Along the head 60 which is movable in the direction of the second axis (Z axis) perpendicular to the mounting surface 601 (the surface plate surface), and a third supported by the head 60 and perpendicular to both the X axis and the Z axis. The arm 70 is movable in the direction of the axis (Y-axis), and is provided in parallel with the column 50 on the base 10. The upper and lower ends of the arm 70 are rotatably supported in a double-supported manner, and are parallel to the Z-axis. A feed operation rod 20 that is rotatable around a rotation axis, a feed drive member (guide roller 11) that urges the base 10 along the guide rail 630, and a rotation transmission that transmits the rotation of the feed operation rod 20. Rotating the member (center shaft member 21) and transmitting the rotation In a three-dimensional shape measuring apparatus having a transmission mechanism (a configuration in which the timing belt 14 is wound between the pulley 13 and the pulley 25), a position (rotation transmission position) for transmitting rotation to and from the central shaft member 21 ) And a position where rotation cannot be transmitted between the central shaft member 21 (rotation non-transmitting position), and the feed operation rod 20 can be moved between the feed operation rod 20 and the central shaft member 21. The switching mechanism 30 for switching between transmission / non-transmission of rotation at the position is provided.

With this configuration, when the position of the base 10 is finely adjusted by rotating the feed operation rod 20, the switching mechanism 30 is configured so that rotation is transmitted between the feed operation rod 20 and the central shaft member 21. Switch. Then, the rotation of the feed operation rod 20 is transmitted to the guide roller 11 via the central shaft member 21. Therefore, the guide roller 11 rolls by an amount corresponding to the rotation amount (rotation angle) of the feed operation rod 20, and the position of the base 10 can be displaced.
On the other hand, when the position of the base 10 is greatly displaced by directly pulling the feed operation rod 20, rotation is not transmitted between the feed operation rod 20 and the central shaft member 21 (so as not to transmit). A) The switching mechanism 30 is switched. Then, the rotation of the feed operation bar 20 is not transmitted to the central shaft member 21, and even if the position of the base 10 is displaced and the guide roller 11 is rolled, the feed operation bar 20 is not rotated. The base 10 can be moved by pulling the feed operation rod 20 without a sense of incongruity.

(2) The switching mechanism 30 includes an engaging member 31 that rotates integrally with the feed operation rod 20, an engaged member 32 that rotates integrally with the central shaft member 21, and a cylinder that rotatably supports the central shaft member 21. In the switching mechanism 30, the engaging member 31 and the engaged member 32 are arranged coaxially inside the case 35, and the engaging member 31 is The engaging member 31 and the engaged member 32 face each other in the direction of the central axis X1 toward the engaging member 31 and downward toward the engaged member 32 side. An engaging pin 33 projecting along the engagement pin 33 is provided, and the member 32 to be engaged is provided with an insertion hole 32b1 into which the engagement pin 33 is inserted. 33 is inserted into the insertion hole 32b1 and engaged with the engaging member 31. The connection position (position (b) in FIG. 4) in which the relative rotation with the material 32 is restricted, and the engagement pin 33 is positioned outside the insertion hole 32b1, and the engagement member 31 and the engaged member 32 are connected. It was set as the structure provided so that movement was possible between the non-connection positions (position of (a) of Drawing 4) in which relative rotation was permitted.

If comprised in this way, the engagement member 31 which rotates integrally with the feed operation rod 20 by the engagement / disengagement of the engagement pin 33 with respect to the insertion hole 32b1 and the engaged member 32 which rotates integrally with the central shaft member 21 will be described. The transmission / non-transmission of rotation can be switched.
Therefore, switching between transmission / non-transmission of rotation between the feed operation rod 20 and the central shaft member 21 can be realized with a simple configuration.

(3) Moreover, it has the holding mechanism which hold | maintains the engaging member 31 in a non-connecting position, and the holding mechanism does not connect the concave groove 31b2 provided in the outer periphery of the engaging member 31, and the engaging member 31. The lock pin 40 is provided so as to pass through the case 35 in the radial direction at a position facing the concave groove 31b2 when arranged at the position, and the tip of the lock pin 40 is movable in the radial direction. And a biasing member 35 b 2 that protrudes from the inner periphery of the case 35 and presses against the outer periphery of the engaging member 31.

  If comprised in this way, the engagement member 31 is hold | maintained in a non-connecting position by engaging the lock pin 40 which protrudes from the inner periphery of case 35 with the ditch | groove 31b2 provided in the outer periphery of the engagement member 31. Can do. Therefore, the relative rotation between the engaging member 31 and the engaged member 32 is allowed with a simple configuration, and the rotation between the feed operation rod 20 and the central shaft member 21 can be kept non-transmitted.

(4) The concave groove 31b2 includes the first concave groove 31b3 to which the lock pin 40 comes into pressure contact with the engaging member when the engaging member 31 is disposed at the non-connecting position (the position shown in FIG. 4B). When the 31 is disposed at the coupling position (position (a) in FIG. 4), the lock pin 40 is configured to be in contact with the second groove 31b4, and the first groove 31b3 is the first groove 31b3. The second groove 31b4 is provided adjacent to the engaged member 32 side, and the surface on the second groove 31b4 side in the boundary wall portion 31b5 between the first groove 31b3 and the second groove 31b4 Is an inclined surface (tapered surface 31b6) in which the outer diameter increases toward the first groove 31b3 located on the engaged member 32 side in the rotation axis direction, and the first groove 31b3 And the second groove 31b4 on the side of the first groove 31b3 in the boundary wall portion 31b5 Is a flat surface 31b7 which is orthogonal to the rotation axis.

If comprised in this way, if the feed operation stick | rod 20 (engagement member 31) is lifted upwards, the lock pin 40 will follow the taper surface 31b6 of the boundary wall part 31b5 of the engagement member 31, and the 2nd ditch | groove 31b4. It moves to the first groove 31b3 side provided adjacent to the engaged member 32 side. If it does so, the engagement member 31 will be hold | maintained in a non-connection position, and rotation between the feed operation stick | rod 20 and the center axis | shaft member 21 will be in a non-transmission state.
Therefore, transmission / non-transmission of rotation between the feed operation rod 20 and the central shaft member can be performed quickly and easily by simply lifting the feed operation rod 20 upward.

(5) A plurality of engagement pins 33 are provided in the circumferential direction around the rotation axis at first intervals (180 ° intervals in the embodiment), and the insertion holes 32b1 are second in the circumferential direction around the rotation axis. A plurality of intervals (18 ° intervals in the embodiment) are provided, and the second interval is set to be narrower than the first interval.

  With this configuration, the number of the insertion holes 32b1 in the circumferential direction around the rotation axis is larger than the number of the engagement pins 33 in the circumferential direction around the rotation axis, so that the engagement pins 33 and the insertion holes 32b1 are engaged. Can be easily combined.

(6) On the opening side of the insertion hole 32b1 in the rotation axis direction, a ring-shaped peripheral edge 32b2 having an outer diameter that increases toward the opening is provided, and the engagement pin 33 has an end on the through-hole 31b1 side. In addition, a small-diameter portion 33b smaller than the inner diameter of the through hole 31b1 is provided, the boundary portion with the small-diameter portion 33b has an outer diameter Ra that matches the outer diameter of the peripheral edge portion 32b2, and the engaging member 31 When arranged at the coupling position (position (a) in FIG. 4), a contact portion 33c that contacts the peripheral edge portion 32b2 from the direction of the rotation axis and restricts the movement of the engagement member 31 around the rotation axis is provided. The configuration is as follows.

When the engaging member 31 moves between the connecting position and the non-connecting position as the feed operation rod 20 moves in the vertical direction, the small diameter portion 33b of the engaging pin 33 provided on the engaging member 31 is engaged. The insertion member 32 is inserted into and removed from the insertion hole 32b1. Then, in a state where the small diameter portion 33b of the engagement pin 33 and the insertion hole 32b1 are engaged, it is necessary to have a predetermined gap between the engagement pin 33 and the insertion hole 32b1, and the engagement pin is caused by the gap. 33 and the insertion hole 32b1 are weakened.
If comprised as mentioned above, since the contact part 33c with a large outer diameter of the engagement pin 33 contacts the peripheral part 32b2, the contact area with respect to the insertion hole 32b1 of the engagement pin 33 can be enlarged. Therefore, it is possible to reliably transmit the rotation between the feed operation rod 20 and the central shaft member 21.

In the embodiment, since the feed operation rod 20 is formed using a hollow aluminum material, the weight is reduced and the moment of inertia when the feed operation rod 20 is rotated is reduced.
Therefore, the operator can lightly turn or stop the feed operation rod 20 with a small force, and finer fine adjustment such as moving the base 10 along the guide rail 630 in the X-axis direction by a slight distance is easy. Can be done.

In the above embodiment, the moderation groove 31c3 is formed over the entire circumference in the circumferential direction of the tip portion 31d, and the plunger 39 is engaged with the moderation groove 31c3, whereby the feed operation rod 20 is pushed down. Although the case of obtaining a moderation feeling has been illustrated, a plurality of moderation holes may be formed at equal intervals in the circumferential direction around the central axis of the tip portion 31d.
In this case, when the feed operation rod 20 is pushed down, the plunger 39 can be engaged with any one of the plurality of moderation holes to obtain a sense of moderation. When rotated around X1, the plunger 39 is engaged with a plurality of moderation holes formed in the circumferential direction in sequence, so that a feeling of moderation during rotation can be obtained.

  The present invention is not limited to the above-described embodiments, and includes various changes and improvements that can be made within the scope of the technical idea.

DESCRIPTION OF SYMBOLS 1 Three-dimensional shape measuring apparatus 10 Base 10a Upper surface 11 Guide roller 11a Drive shaft 11b Rotation knob 12 Guide roller 13 Pulley 14 Timing belt 20 Feeding operation rod 20a Connection member 20a1 Through-hole 20a2 Bolt 20b Shaft member 21 Central shaft member 22 Connection member 22a Through hole 23 Lock mechanism 23a Brake shoe 23b Handle 24 Lock mechanism 241 Base 241a Through hole 25 Pulley 26 Upper support mechanism 26a Support member 26b Connection member 27 Cylindrical member 28 Lower support mechanism 29 Rotation transmission mechanism 30 Switching mechanism 31 Engagement member 31a Shaft portion 31b Flange portion 31b2 Concave groove 31b3 First concave groove 31b4 Second concave groove 31b5 Boundary wall portion 31b6 Tapered surface 31b7 Flat surface 31c Insertion portion 31c1 Large diameter portion 31c2 Small diameter portion 31c3 Degree groove 32 Engagement member 32a Large diameter part 32b Flange part 32b1 Insertion hole 32b2 Peripheral part 32c Attachment part 32c1 Bolt 33 Engagement pin 33a Base part 33b Small diameter part 33c Abutting part 33c1 Abutting surface 34 Bearing 35 Case 35a Through hole 35b Peripheral wall 35b1 Through hole 35b2 Biasing member 36 Bearing 38 Bearing 39 Plunger 40 Lock pin 41 Holding mechanism 50 Column 60 Head 70 Arm 80 Measuring probe 90 Horizontal flange 92 Tension rod 600 Surface plate 601 Mounting surface 610 Feed groove 620 Side wall 630 Guide rail

Claims (6)

A base movable along a track provided in the direction of the first axis of the mounting surface of the surface plate;
A head movable in the direction of the second axis perpendicular to the mounting surface, along a column raised on the base;
An arm supported by the head and movable in the direction of a third axis perpendicular to both the first axis and the second axis;
A feed operating rod that is provided in parallel with the column on the base, and whose upper and lower ends are rotatably supported in a dual-supported manner, and is rotatable about a rotation axis parallel to the second axis. When,
A three-dimensional shape measuring apparatus comprising: a feed drive member that urges the base along the track; and a rotation transmission mechanism that communicates rotation with a rotation transmission member that transmits rotation of the feed operation rod. In
The feed operation bar is provided so as to be displaceable also in the rotation axis direction,
A switching mechanism for switching transmission / non-transmission of rotation between the feed operation rod and the rotation transmission member ;
In the switching mechanism, the transmission / non-transmission of rotation between the feed operation rod and the rotation transmission member is switched by displacement of the feed operation rod in the rotation axis direction. apparatus. The switching mechanism is
An engaging member that rotates integrally with the feed operating rod;
An engaged member that rotates integrally with the rotation transmitting member;
And a cylindrical support member that rotatably supports the rotation transmission member,
In the switching mechanism, the engaging member and the engaged member are arranged coaxially inside the support member, and the engaging member is provided to be movable in the rotation axis direction. ,
In the facing portion between the engaging member and the engaged member, the rotation is performed on one of the engaging member and the engaged member toward the other of the engaging member and the engaged member. An engagement pin that protrudes along the axis is provided,
An insertion hole into which the engagement pin is inserted is provided in the other of the engagement member and the engaged member,
In the support member, the engagement member is:
A coupling position for inserting the engagement pin into the insertion hole and restricting relative rotation between the engagement member and the engaged member;
The engagement pin is positioned outside the insertion hole, and is provided so as to be movable between a non-connection position in which relative rotation between the engagement member and the engaged member is allowed. The three-dimensional shape measuring apparatus according to claim 1. A holding mechanism for holding the engaging member in the non-connected position;
The holding mechanism is
A concave groove provided on the outer periphery of the engaging member;
A lock that is provided to penetrate the support member in a radial direction at a position facing the concave groove when the engagement member is disposed at the non-connecting position and is movable in the radial direction. idea,
3. The three-dimensional shape measuring apparatus according to claim 2, further comprising an urging member that protrudes from the inner periphery of the support member and presses against the outer periphery of the engagement member. . The groove is
A first recessed groove with which the lock pin is pressed when the engaging member is disposed at the non-connected position;
When the engaging member is disposed at the coupling position, the second concave groove with which the lock pin is pressed,
The first groove is provided adjacent to the engaged member side of the second groove,
The surface on the second groove side in the boundary wall portion between the first groove and the second groove is the first groove located on the engaged member side in the rotation axis direction. It is an inclined surface with an outer diameter that increases toward the side,
The surface on the first concave groove side of the boundary wall portion between the first concave groove and the second concave groove is a flat surface orthogonal to the rotation axis. The three-dimensional shape measuring apparatus described in 1. A plurality of the engagement pins are provided at a first interval in the circumferential direction around the rotation axis,
A plurality of the engagement holes are provided at a second interval in the circumferential direction around the rotation axis,
5. The three-dimensional shape measuring apparatus according to claim 2, wherein the second interval is set to be narrower than the first interval. On the opening side of the insertion hole in the rotation axis direction, a ring-shaped peripheral portion whose outer diameter increases as approaching the opening is provided,
In the engagement pin, a small-diameter portion smaller than the inner diameter of the insertion hole is provided at an end portion on the insertion hole side, and is aligned with the outer diameter of the peripheral edge at a boundary portion with the small-diameter portion. An abutment that has an outer diameter and abuts against the peripheral edge from the direction of the rotation axis when the engagement member is disposed at the coupling position, and restricts movement of the engagement member around the rotation axis The three-dimensional shape measuring apparatus according to any one of claims 2 to 5, wherein a part is provided.