JPH0241529Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an origin block support for a coordinate measuring machine, and more specifically, an origin block that is brought into contact with a touch signal probe for obtaining a touch signal and used to determine the origin position. This invention relates to an improvement in the structure of an origin block support stand for a three-dimensional measuring machine that supports a workpiece on a stage.

When performing measurements using a three-dimensional measuring machine, it is necessary to match the orientation and shape of the touch signal probe to the orientation and shape of the measurement location on a workpiece fixed on a workpiece stand (measuring table). Therefore, when the measurement location (measurement surface) changes, the attitude of the touch signal probe may also have to be changed accordingly.

When the attitude of the touch signal probe is changed in this way, it is necessary to newly find the origin of the coordinate system that applies to the measurement point (measurement surface), but depending on the new attitude of the touch signal probe, The origin position may not be determined unless the orientation of the origin block is also changed. However, while the attitude of the touch signal probe can generally be easily changed, it has been extremely difficult to change the attitude of the origin block with the conventional origin block support stand.

This is because in the conventional origin block support stand, the entire support stand was completely fixed to a nut member embedded in the workpiece stand by a bolt provided on the lower end side. This is because the three-dimensional position relative to the stand must be uniquely determined by the shape of the support stand and the thread pitch of the nut member and the bolt portion. For this purpose, in the past, the direction of the origin block was changed by inserting a shim between the support stand and the workpiece stand to change the screwing position of the bolt part and the nut member. With this method, it is extremely difficult to fix the origin block in a desired orientation.

In addition, there were cases in which multiple origin blocks oriented in various directions were placed on the stage in advance.
It is not desirable to place multiple origin blocks because it reduces the effective measurement area.

SUMMARY OF THE INVENTION An object of the present invention is to provide an origin block support stand for a coordinate measuring machine that allows the orientation of the origin block to be easily changed in accordance with changes in the orientation of the touch signal probe.

Therefore, in the present invention, in the origin block support stand of a coordinate measuring machine that supports the origin block on the stage, which is used for determining the origin position by contacting the touch signal probe, the origin block is embedded in the document stage. A bolt part that is screwed into and penetrates a nut member, a main body part on which an origin block is placed and is rotatable about the bolt axis of the bolt part and can be freely displaced in the axial direction, position fixing means capable of fixing the body at any rotational position with respect to the part and fixing the main body at a position separated by a predetermined distance from the object table, and fixing the screwing position of the bolt part by coming into contact with the object table; The main body is provided with a position regulating end face for fixing the origin block side to the stage, and a strong and simple screwing method of the bolt part and the nut member is adopted. The purpose of the present invention is to achieve the above object by making the origin block movable (rotatable) in the circumferential direction as appropriate, thereby making the origin block rotatable around the axis of the bolt portion.

Hereinafter, embodiments of the present invention will be described based on the drawings.

FIG. 1 shows a first embodiment of the origin block support for a three-dimensional measuring machine according to the present invention. The nut member 3 embedded in the base (measuring table) 2 can be screwed into the nut member 3 .

A male threaded portion 4 is provided on the upper end side of the bolt portion 1, and a cylindrical portion 5 in the form of a round shaft member is provided coaxially with the bolt portion 1 on the further upper end side of the male threaded portion 4.

The male threaded portion 4 has a smaller pitch and a reverse thread shape than the bolt portion 1, and the male threaded portion 4 has a female threaded portion 7 formed on the inner circumferential side of the main body 6, which is a substantially cylindrical main body. They are screwed together. In addition, the female thread part 7
is opened on the lower end side of the main body 6, and the upper end side communicates with a small cylindrical cavity 8 formed in the central axis of the main body 6, and the cylindrical part 5 is placed in this cavity 8. It is rotatably stored.

Further, a set screw 9 as a position fixing means is threadedly inserted into one side surface of the main body 6, and the tip of this set screw 9 can be pressed against one side surface of the cylindrical portion 5.

A plurality of legs 11 are provided on the upper end side of the main body 6, and an origin block 12 is mounted and fixed on the main body 6 by the legs 11. Origin block 1
2 is machined with high precision into a spherical shape, and its center point is arranged precisely on the central axis of the bolt portion 1, in other words, on the central axis of the nut member 3. On the other hand, the lower end surface of the main body 6 is machined into a planar shape that is perpendicular to the central axis of the bolt part 1, and this lower end surface contacts the document table 2 to fix the screwing position of the bolt part 1. A position regulating end surface 13 is configured.

In order to fix the origin block 12 on the stage 2 according to this embodiment, the main body 6 is rotated with respect to the cylindrical part 5 using the setscrew 9, in other words, the main body 6 is rotated with respect to the male threaded part 4. In this state, the bolt part 1 is screwed into the nut member 3 of the stage 2, and the position regulating end face 13 of the main body 6 is brought into pressure contact with the upper end face of the stage 2, whereby the main body 6, That is, the origin block 12 is fixed on the stage 2.

In order to rotate the main body 6 from this state and change the orientation of the origin block 12, loosen the setscrew 9 once and allow the main body 6 to rotate relative to the cylindrical part 5. In other words, On the other hand, the female threaded portion 7 is made rotatable and rotated relative to the male threaded portion 4 so that the main body 6 rises toward the upper end in the figure. At this time, since the male threaded portion 4 is threaded in a reverse thread shape with respect to the bolt portion 1, the bolt portion 1 does not rotate relative to the nut member 3 as the main body 6 rotates. When the main body 6 is rotated, the screwing position between the male threaded part 4 and the female threaded part 7 is displaced toward the upper end in the figure, and as a result, the position regulating end surface 13 is separated from the upper end surface of the stage 2 by a predetermined length. be done. At this time, if necessary, the origin block 12 can be used after screwing and fixing the setscrew 9 in this state. By changing the height position of the origin block 12 in this manner, it is possible to check the measurement accuracy in the acute direction of the coordinate measuring machine itself (not shown).

Next, if the bolt part 1 is screwed into the nut member 3 so as to press the position regulating end surface 13 into contact with the upper end surface of the stage 2, depending on the amount of rotation required to bring the position regulating end surface 13 into pressure contact with the upper end surface of the stage 2.
That is, the orientation of the origin block 12 is changed depending on the thread pitch between the bolt part 1 and the nut member 3.

According to this embodiment, the origin block 12, once placed and fixed in a predetermined orientation on the stage 2, can be easily changed to a desired orientation without changing its height position. Therefore, the orientation of the origin block 12 can be quickly and easily changed in response to changes in the attitude of the touch signal probe.

Moreover, the structure as a whole is simple with few components, and can be easily assembled and robust.

FIG. 2 shows a second embodiment, in which a base 21 in the form of a cylindrical body with a bottom is provided, and a bolt portion 1 is mounted at the center of the lower end of the base 21 in the downward direction in the figure. It is protruded from the side. Further, the lower end surface of the base 21 is used as a position regulating end surface 13.

A main body 22 that supports the origin block 12 via the legs 11 is configured to be supported by the base 21 so as to be rotatable about the central axis of the bolt part 1, and the main body 22 and the base 21 constitutes the main body. The center of the origin block 12 placed on the main body 22 is located on the rotation center axis. Further, a set screw 23 as a position fixing means is threadedly inserted into one side of the base 21 in the radial direction, and when the tip of the set screw 23 is pressed against one side of the main body 22, the main body 22 is moved from the base. It is designed to be fixed to the stand 21 at a predetermined rotational position.

According to the second embodiment, the bolt portion 1 is screwed into the nut member 3 so that the position regulating end face 13 of the base 21 is pressed against the upper end face of the stage 2, and the base 21 is connected to the stage 2. 2, while keeping it firmly fixed at all times.
Only the main body 22 can be rotated as appropriate. Therefore, when changing the direction of the origin block 12, in this embodiment, the main body is separated into the main body 22 and the base 21, so it is not necessary to rotate the bolt part 1 as in the first embodiment. Instead, the orientation of the origin block 12 can be changed simply by rotating the main body 22, resulting in the effect that the change can be made more quickly and easily.

FIG. 3 shows a third embodiment, in which a bolt part 1 is provided at the center of the lower end protruding downward, and the upper end face is oriented in the horizontal direction. A disk block-shaped base 31 is provided. The lower end surface of this base 31 is the end surface 1 for position regulation.
3, and on the horizontal upper end surface of the base 31, a plurality of pins 32 are protruded circumferentially at equal intervals around the central axis of the bolt part 1. The plurality of pins 3 are provided on the horizontal lower end surface of the main body 33 that supports the origin block 12 through the main body 33.
A small hole 34 is formed into which each of the parts 2 is removably inserted. The main body 33 and the base 31 constitute a main body portion, and the pin 32 and the small hole 34 constitute a position fixing means.

Therefore, in this third embodiment, the main body 33 is placed on the base 31 with the pin 32 inserted into the small hole 34.
Once the main body 33 is placed and fixed, the main body 33 is pulled up from the base 31, the pins 32 are removed from the small holes 34, and the main body 33 is rotated by an amount corresponding to each interval of the pins 32 (small holes 34). After that, if the main body 33 is placed on the base 31 again so that each of the pins 32 is fitted into the small holes 34, the orientation of the origin block 12 can be easily changed. In this third embodiment, unlike the first and second embodiments, there is no need to operate the setscrews 9 and 23, and the main body 33 is simply moved onto the base 31.
Since it is only necessary to place the origin block 12 on top, the orientation of the origin block 12 can be changed more easily and quickly.

FIG. 4 shows a fourth embodiment, in which the lower end surface is used as a position regulating end surface 13, and a bolt portion 1 is provided protruding downward in the figure from the center of the lower end surface. A substantially disk-shaped base 41 is provided.
This base 41 includes a base 42 having a substantially inverted bottomed cylindrical shape.
is fixed, and a vacant space 4 is provided on the inner circumferential side of the base 42.
3 is formed.

A center hole 44 is bored in the center of the upper end surface of the base 42, and a rotation shaft 45 is rotatably inserted into the center hole 44. The rotating shaft 45 is provided protruding downwardly in the figure from the center of the lower end surface of the main body 46 that supports the origin block 12 via the legs 11, and the tip of the rotating shaft 45 is disposed within the space 43. has been done. The main body 46 and the base 42 constitute a main body. Further, a spring receiver 47 is fixed to the tip, and a compression coil spring 48 is interposed between the spring receiver 47 and the base 42 so as to surround the rotation shaft 45 .

Furthermore, grooves 49 having a substantially serrated cross section are carved radially around the center hole 44 on the upper end surface of the base 42, while grooves 49 having the same shape as the grooves 49 are formed on the lower end surface of the main body 46. Grooves 50 are formed. The grooves 49 and 50 and the compression coil spring 48 constitute position fixing means.

According to the fourth embodiment, the main body 46 is moved against the base 42 against the biasing force of the compression coil spring 48.
After pulling up the grooves 49 and 50 once to release the engagement between them, the main body 46 is pulled up against the base 42.
The orientation of the origin block 12 can be easily changed by rotating it by a predetermined angle and bringing the grooves 49 and 50 into engagement again at the predetermined rotation position. Therefore, although it is similar to the third embodiment in that there is no need to operate the set screws 9 and 23 as in the first and second embodiments, it is possible to turn them more finely than in the third embodiment. This has the effect of being able to change the moving position.

In addition, in carrying out the implementation, a spherical origin block 12
is always located on the central axis of the bolt part 1, but the leg part 11 may be inclined in a predetermined direction so as to be spaced apart from the central axis by a predetermined length.

In addition, the origin block is a spherical origin block 1.
2, for example, a plurality of plane parts 5 orthogonal to each other, such as the origin block 52 shown in FIG.
It may have a structure having 3.

As described above, according to the present invention, it is possible to provide an origin block support stand for a coordinate measuring machine that can easily change the orientation of the origin block in response to changes in the orientation of the touch signal probe.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view showing the overall structure of a first embodiment of the origin block support for a coordinate measuring machine according to the present invention, and FIGS.
FIG. 4 is an exploded perspective view showing the overall structure of the fourth embodiment with a part cut away, and FIG. FIG. 2 is a perspective view showing the configuration of an origin block in an embodiment. DESCRIPTION OF SYMBOLS 1... Bolt part, 2... Loading stand, 3... Nut member, 4... Male thread part, 5... Cylindrical part, 6, 2
2, 33, 46...Main body, 7...Female threaded portion, 1
2, 52... Origin block, 13... End face for position regulation, 21, 31, 42... Base, 41... Base.

Claims (1)

[Claims for Utility Model Registration] (1) An origin block support stand for a coordinate measuring machine that supports an origin block on a stage, which is used for determining the origin position by contacting a touch signal probe, A bolt part that is threadedly inserted into a nut member embedded in the document stand, and a main body part on which an origin block is placed and is rotatable about the bolt axis of the bolt part and can be freely displaced in the axial direction. a position fixing means capable of fixing the main body at any rotational position with respect to the bolt part and fixing the main body at a position spaced apart from the stage by a predetermined distance; An origin block support stand for a three-dimensional measuring machine, characterized in that it is provided with a position regulating end face for fixing the screwing position of a bolt part. (2) In claim 1 of the utility model registration claim, a male threaded portion having a smaller pitch and a reverse thread shape than the bolt portion is coaxially provided on the upper end side of the bolt portion, and the male threaded portion has a reverse thread shape. An origin block support for a three-dimensional measuring machine, characterized in that the base block is fixedly screwed onto a predetermined screwing position, and the position regulating end face is formed at a lower end of the main body. (3) In claim 1 of the utility model registration claim, the main body portion is a main body on which an origin block is placed;
An origin block support stand for a three-dimensional measuring machine, comprising a base rotatably holding the main body. (4) In claim 1 of the utility model registration claim, the main body part includes a main body on which an origin block is placed, a plurality of small holes in the bottom thereof, and a plurality of pins that fit into the small holes. 1. An origin block support stand for a three-dimensional measuring machine, characterized in that it is comprised of a base stand erected on top of the base block. (5) In claim 1 of the utility model registration claim, the main body portion is engaged with a main body on which the origin block is placed and a groove is formed on the bottom surface of the main body, and a groove formed on the main body. An origin block support for a three-dimensional measuring machine, comprising a base having grooves. (6) The origin block support stand for a three-dimensional measuring machine according to any one of claims 1 to 5 of the claims for registration of a utility model, characterized in that the origin block has a plurality of plane parts that are perpendicular to each other.