JPS6049202A - Contact detector - Google Patents

Abstract

PURPOSE:To detect when a movable member having a contactor is displaced with high precision and return it to an origin speedily and accurately by displacing the movable member on the same fulcrum in a +X and a -X direction, and providing this fulcrum separately from an electric contact. CONSTITUTION:A contact detector has a fixed part 1, which forms the external cylinder of the contact detector. The 1st movable member 3 is supported pivotally and rotatably on said fixed part 1 at a fulcrum 2. The 2nd movable member 5 is fixed rotatably on the fixed part 1 at a fulcrum 2, and the contactor 6 is provided atop. When the contactor 6 is displaced in the -X direction by contacting the body to be measured, the 2nd electric contact 9 is broken. Thus, the position of the body to be measured is detected precisely.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a contact detection device, referred to as a touch probe, for electrically detecting contact of a contact with an object in an NC machine tool or a three-dimensional coordinate measuring machine. .

In order to detect this contact, it is necessary not only to sensitively detect the contact, but also to move the contact back accordingly when it hits the object, and return to the original position accurately when the contact with the object is not removed. It is necessary to have a return position, and a small and easy-to-operate device is desired.1 Various contact detectors have been developed for this purpose. Japanese Patent Publication No. 58 No. 27402 "Measurement Probe" is similar to the one shown in "Measurement Probe", in which the fulcrum when the contact comes into contact with the object to be measured and moves around serves as a return mechanism and an electric contact. Therefore, it is not desirable for the support to move in the first place), and C1 cannot be reliably returned to the original position after each measurement, making it unsuitable for high-precision i! There were drawbacks such as the fact that six electrical contacts had to be electrically connected after recovery, which required a lot of effort to manufacture and adjust.

The present invention has a simple structure, is small and lightweight, and always has an accurate return position, making it suitable for high-precision measurements. In the following explanation, we will explain a case where the contact is displaced in the X direction, but if you combine these in two stages, you will get an X1Y displacement, and if you combine them in three stages, you will get a contact in x, y, z, that is, in all directions. It is possible to detect this when

FIG. 1 is a diagram illustrating the principle of the present invention, in which a first movable member 3 is rotatably supported on a fixed portion 1 with a fulcrum 2. In FIG. Further, the fixed part has another fulcrum 4, and a second movable member 5 having a contactor 6 at its tip is pivotally supported at l+J and i'+J functions. A first electric contact 7 is provided between the fixed part 1 and the first aJ moving member 3,
A biasing means such as a tension spring 8 is provided for biasing the first movable member 3 in the direction of the fixed part 1 so that the first voltage point B is normally closed. Further, a second electrical contact 9 is provided between the first movable member 3 and the second movable member 5, and the second movable member 5 is connected to the first Di! so that the second electrical contact is normally closed. 1if
Provide biasing means such as a tension spring 10 biasing the t member 3 in the direction thereof.

Now, when a force in the -X direction in the figure is applied to the contactor 6 of the second movable member 5, the second movable member 5 resists the force of the tension spring 10 and moves to the fulcrum 4.
The second electrical contact 9 is opened by rotating clockwise around the center. When the force in the -X direction is released, the second movable member 5 returns to its original position by the action of the tension spring 10. Conversely, when the contactor 6 of the second movable member 5 is subjected to a force in the ↑ The second movable member 3 is pushed, and the first moving part 3 rotates counterclockwise about the fulcrum 2 as the +F+ center against the force of the tension spring 8 to place the first electrical contact 7.

Then, when the force in the + incoming direction is released, the number: j + J'zS
The member 3 returns to its original position under the action of the tension spring 8.

What is shown in FIGS. 2 and 3 is one embodiment of a contact detection device that is practically compactly constructed based on the principle of the present invention shown in FIG. 1 and its explanation. Components that are the same as those in the figures will be described using the same numbers. 1 is a fixed part forming an outer cylinder of the contact detection device.

3 is a first movable member rotatably supported by the fixed part 1 at a fulcrum 2, and 5 is a second movable member rotatably supported by the fixed part 1 at a fulcrum 4. A contact 6 is provided at the tip of the member. Reference numeral 11 denotes a contact pin which is electrically insulated and implanted in a protruding portion 12 in the fixed part 1 with an insulating bushing 13, and is connected to the first movable member 3 indicated by mI located at a position 1ξ opposite to this. One electrical contact 7 is formed. Reference numeral 14 denotes a contact pin which is electrically insulated and implanted at the end of the second movable part 5 opposite to the contact 6 with an insulating package 15, and the first contact pin located at a position opposite thereto. A second electrical contact 9 is formed between the movable member 3 and the movable member 3 . 8 is a tension spring that biases the first movable member 3 in the direction of the protruding portion 12 around the fulcrum 2;
° means the second movable member 5 is moved around the first movable member 5 around the fulcrum 4.
This is a tension spring that biases the movable member 3 in the direction. Therefore, at all times, that is, when no external force is applied to the contactor 6 in the +X direction or the -X direction, the contact pin 11 and the first movable member 3 and the contact pin 14 and the first movable member 3 are in contact, as shown in the figure. As shown, the second movable member 5 maintains a vertical position with respect to the fixed part 1, that is, the original position. 16 and 17 are cords connected to the contact pins 11 and 14, respectively, and are guided to the outside of the fixed part 1 and connected to a power source (not shown);
Therefore, a series electric circuit is constructed consisting of the coat 6, the contact pin 11, the first movable member 3, the contact pin 14, and the J-type 17.

In the structure shown in B, when the right side of the contactor 6 comes into contact with the object to be measured (not shown) and the contactor 6 moves in the -in direction, the second movable member 5 is moved by a tension spring around the fulcrum 4. 1
The contact pin 14 and the first movable member 3 are separated from each other by rotating clockwise against a tensile force of 0, and electrical continuity is interrupted.

In other words, when the contactor 6 contacts the object to be measured and is displaced in the -X direction, the conduction of the second electrical contact 9 is cut off at that moment.This can be detected by an appropriate detection device to locate the object to be measured. It can be detected accurately. Next, the tension spring releases the contact between the contact 6 and the object to be measured]
Due to the action of 0, the second movable member 5 comes into contact with either the contact pin 14 or the second movable member 3 in the counterclockwise direction L! I rqb and the contactor 6 returns to its original position.

Next, the left side of the contact 6 contacts the object to be measured, and the contact 6
When moving in the X direction, the second movable member 5 rotates counterclockwise about the fulcrum 4, and the contact pin 14 moves toward the first movable member 3.
In order to push the contact pin 11 , the first movable member 3 rotates counterclockwise around the fulcrum 2 against the tensile force of the tension spring 8 .
The electrical conduction of the first electrical contact 7 is interrupted by separating from the first electrical contact 7, and the position of the object to be measured can be detected with high accuracy as in the case described above. Next, in order to release the contact between the contactor 6 and the object to be measured, the first movable member 3 rotates clockwise under the action of the tension spring 8 until it comes into contact with the contact pin 11, and the second
nJ Ut member 51 degree rotates and contact A 6 returns to the original position A.

In the above embodiments, the fulcrums 2 and 4 are explained using bearings as an example, but the present invention is of course not limited to this, and it is possible to use a leaf spring, a cross spring, etc. as appropriate.

As described in detail above, according to the contact detection device of the present invention, the second movable member having the contactor contacts the fixed object δ1 and +
By using the same fulcrum as the fulcrum when displacing in the X direction and - It can be detected with high precision as a signal,
Therefore, when the contactor is released from contact with the object to be measured, it has been possible to quickly return to the home position in 1F and 6K, which is an excellent effect.

[Brief explanation of the drawing]

FIG. 1 is a section explaining the principle of the present invention, section 2.times. is a side sectional view of one embodiment of the present invention, and section 3 is a sectional view taken along the line 1--■ of the second section. 1: Fixed part 3: First movable member 5 Second movable member 6: Contactor 7: First electrical contact 9: Second electrical contact Patent applicant Co., Ltd. Tokyo ¥l! Figure 1 11゛7 Figure 3

Claims (1)

[Claims] A fixed part, a first movable member pivotally supported by the fixed part, a biasing means for biasing the first movable member toward the fixed part, a first electric contact provided between the first movable member and the fixed part, and a fixed part. A second i'jJ member is pivotally supported in the part and has a contact at its tip;
A contact detection device comprising: a biasing means for biasing a movable member against a second movable member; and a second electrical contact provided between the first movable member and the second movable member.