JPS58151503A - Position detecting device - Google Patents

Abstract

PURPOSE:To obtain a position detecting device having good reproducibility and high accuracy, by constituting so that the first holding member for holding an electrode contact makes a concentrical spherical surface with the electrode contact, and the second holding member linearly contacts with this concentrical spherical surface. CONSTITUTION:An electrode contact 21 is fitted to one end of a stylus 22, and the other end is fixed to the first holding member (disk 23) in a housing 26. The circumferential part of the disk 23 is formed so as to become a rotating curved surface body 24. On the bottom part of the housing 26, the second holding member 25 is provided, and the rotating curved surface body 24 and the second holding member 25 are made to press-contact by a spring 28. The contact face of the holding member 25 makes a concentrical circle with the electrode contact 21. To a relaying plate 27, a shank 29 is fitted, and through the shank 29, a position detecting device is installed to a machine tool, etc. The rotating curved surface body 24 makes an axis of the stylus 22 a center axis, and the circumference is fitted into the housing 26, therefore, even if any three-dimensional direction force is applied to the electrode contact, it is operated smoothly.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a three-dimensional position detection device, and particularly to an improvement in a holding mechanism for a stylus having a KIIc handle at one end thereof.

As is well known, in machine tools for milling machines, it is becoming more and more desirable for the three-dimensional dimension needle #J' of the workpiece after processing to have five functions. For this purpose, conventionally, for example, a position detection device as shown in FIGS. 1 and 2 is used to determine the position of the reference surface and end surface of the workpiece, and to determine the position of the reference surface.

The machining position was detected from the end face.

In FIGS. 1 and 2, reference numeral 11 denotes an electrode contact made of a conductive sphere, which is provided at one end of the filler, and its holding mechanism is constructed as follows.

In the housing 1, the filler is fixed to the disk 4, and the receiver members 6, 7, 8 are held and fixed to the 8 plates 4 through the insulating plate 5.

At the 1 & portion of the housing 5, set screws 3 having spherical bodies 2 are disposed at positions approximately divided into three equal parts. This sphere is part 1! , 7.8 is a trap, and the spring l
A pressing force is applied by O through the insulating member 9, and the two are pressed together.

14 is a lock screw for locking the set screw 3.

The position detection device having the above-mentioned configuration is attached to the machine tool 14 by the shank 13 as shown in the 3i1WK, and the electrode contactor 1 is attached to the workpiece 14 which is KIkm on the table 15.
1 contacts, the electrical K11l is activated by the detection path 16.
Then, the position #IL◆ is detected.

However, in the configuration of the conventional device described above, as shown in FIG. The shape of I is a circular dot, V@
, and by each of them vibrating against each sphere 2, 3
It is a trap designed to ensure that it is the only stable position in the dimension.

It takes a real ball! ! :* This trap was created to solve the drawbacks of the technology, in which the electrode contactor made of a conductive sphere is held by the holding members of IEI and 82 which are press-contacted in the housing via the stylus, and the holding member of the irises 1 is held. It is assumed that Ii# forms a concentric spherical surface with the electrode contactor, and the holding S*t of the sleeve 2 is configured in 5 such that it contacts the concentric sphere I11.

This book JilIij! refers to the examples shown in IIl- below.
To explain this, in Figures 4N(a) and 5, the electrode contact arm is attached to one end Km of the stylus n, and the first holding member in the housing 3, for example, the disk 23, is attached to the stylus n and other parts. The end is fixed.The circumferential portion of the disk holder is formed to form a rotating body.

A second holding member 6 is disposed on the bottom sK of the housing, and the rotating facepiece and the second holding member are pressed together by a spring 28, and the contact surface of the holding member is connected to an electrode as shown in the figure. It has a spherical shape concentric with the tentacle 4.

Furthermore, the upper sK of the housing is provided with a relay plate, and a shank 4 is attached to this relay plate 27. As shown in the figure, it is attached to 32 machine tools.

Now, the above-mentioned invention! In the first position, a temporary KI is applied to the contact of the second holding member 6 for positioning the electrode contactor 4.
If the first holding member arm is in contact at three points A, B, and C as shown in FIG.

As mentioned above, the center of the tentacle and [2 holding material 2Sf
)@The centers of the spherical surface (spherical surface) are the same, so if one point IP is among the three points A, B, and C on the spherical surface, then PQ=mouse, A,
43, that is, even if the position of P changes, the position of Q remains unchanged.

Next, an error of 4LPQ=R+Δ8, that is, ΔB occurs, and P
is shifted by Δd, then Q is shifted by 11K by Q, and its -
The difference QQ'=g becomes K as shown below.

Even if there is a difference in Δd in the setting position of the holding member of the electrode contactor due to a defect, the error of the electrode contactor will be reduced to 6-.
Furthermore, in the configuration of the present invention, the IEI holding @@znI)-transfer unit has the axis of the stylus O as the central axis, and all
The holding S material is press-welded so that it touches circularly in the spherical direction, and the area around the kjJ & mai body 240 is statically connected to the housing cover, so that in a stationary state, Δ-
÷O, and the @l1g becomes smaller. Moreover, even if force is applied to the electrode contactor in any three-dimensional direction, it can operate smoothly.

The rotating curved surface body S is made of, for example, a knot, and at the moment when the electrode contactor of the object to be measured (conductor) Km comes into contact, the leads 1 and 1' are turned on and position detection is performed.

Figure aI6 is an example of a contact position detection circuit used in the present invention, and shows the leads 31 and 32 from the connector (material) and the lead II from the table on which the workpiece 33 is placed. 3
6 is the input #lc of amplifier n! It is connected. Amplifier 3
The output of 7 is connected to the relay 38, and the power supply island is connected to the axis detection device 140 such as a lamp, buzzer, etc. and the counter 41K via the relay 38.

Now, when the table head of the machine tool or its main shaft 41 is moved in the direction of the arrow by vertical and horizontal feed, and the electrode contactor 21 approaches and contacts the end face of the workpiece, the input of the multiplier n is a closed circuit. This output activates the relay. Therefore, the annunciator switch is activated and the point of contact is quickly and positively detected. At the same time, an input is given to the counter 41, so the wrinkle input causes the counter dt/
By resetting it to zero and starting counting from this point, it is possible to know the moving distance S of the table or the main shaft.

In the above embodiment, the stylus n can be moved in any three-dimensional direction, but as shown in ll9-, the second holding member 5 is a cylindrical surface member, and the first holding member In 23, instead of the rotational curved surface, the matrix ll of the above cylindrical surface is used.
Either make it a curved WJ body consisting of parallel generatrix lines, or make it a structure in which the positions of two spheres or cones, etc., do not rotate around the axis of the stylus n, as shown in figure g*. It restricts movement in the Y direction and operates in two directions, X and 2.5
You can also K.

Furthermore, instead of having a cylindrical housing shape, the contact piece may have a structure in which the contact piece is in a stationary position (at some time, its position is returned to KOi before operation).

As is clear from what has been explained above, according to the truth,
Since both holders ii# of the electrode contactor are touching, the inner product of contact is large, and the movement and amount of the stylus is constant in any direction in the horizontal direction.

Therefore, it has good curling properties, high precision, good durability, and has a relatively simple structure, which is advantageous in terms of manufacturing.

[Brief explanation of the drawing]

Figures 1 (a) and (b) are schematic diagrams of an example of a conventional position detection device, and Figures 11 and 2 (a) and (b) are diagrams w and 1 (a).
) are A-A@ and B-Biii arrow views, and Figure 3 is a block diagram showing an example of a position detection circuit using this conventional device.
8g4! W(aL (b) and FIG. 5 are schematic diagrams showing one embodiment of the present invention, and FIG. 6 is a block diagram showing a wIL detection circuit using the embodiment. 8 and 9 are block diagrams showing main parts of other embodiments of the present invention. 21... Electrode contact, n... Stylus, Ru... ... Disc, Mu ... Rotating curved surface body, % ... Housing. Patent applicant: Sony Magnescale Co., Ltd. Agent Patent attorney Eiji 1) Take 3 Part 1 Figure 1G) (b) Figure 2 (0) Figure 7 (0) (b) Figure 8 Procedural amendment document Showa era 1999 Zenkoho No. 38806 2 Crow's name position derogatory device 3 Relationship with the person making the amendment case Tatamikoro Person Address Name: Soe Manescale Co., Ltd. 4, Agent:
105 Address: Shiba 3-chome Pill 5, 3-2-14 Shiba, Minato-ku, Tokyo Subject of amendment (1) This M specification Honor I! Delete "32" on page 4, line 114. (Delete ``41'' in line 13 on page 6, j9 of 23 Doubou. 4th person position aS device 3 Relationship with the case of the person making the amendment License applicant address name Name Sony Magnescale Co., Ltd. 4 agent 〒1
05 Address: Shiba 3-chome Pill 5, 3-2-14 Shiba, Minato-ku, Tokyo Target of amendment The following words and phrases are added between lines 13 and 14 on page 7 of the present application 1jjIs.

Claims (1)

[Scope of Claims] 11) The electrode is held by the first and second holding members which are pressed into contact with the housing circle through an electrode contactor made of a conductive sphere, such as a stylus, and the holding member @1 is held by the above-mentioned electrode. The tentacle and the concentric sphere form a second holding member.
A position detection device characterized in that it is configured in such a way that it makes contact. (2) Patent rust-seeking range Ma1, characterized in that the first holding II# is provided with a rotating curved body V on the circumference of a disk.
Position detection device. (3) *The holding member of broom 2 has a cylindrical shape,
- Detecting the position according to item 111 in which the holding member of the first set is configured like a two-dimensional K Dr spade on the cylinder 1 of the second holding member; Device.