JPS6049201A - Contact detector - Google Patents

Abstract

PURPOSE:To detect when a contactor is displaced with high precision and return it to an origin speedily and accurately by providing the fulcrum on which the contactor is displaced by contacting a body to be measured and an electric contact separately. CONSTITUTION:A fixed part 1 forms the external cylinder of a contact detector. Then, the 1st movable member 3 is supported on said fixed part 1 pivotally and rotatably at the fulcrum 2 and formed in a reverse L shape. Further, the 2nd movable member 8 is supported on the 1st movable member 3 pivotally and rotatably at a fulcrum 7, and the contact 9 is provided atop. This constitution detects the moment when the contactor is displaced by contacting the body to be measured in the form of an electric signal with high precision and a high- precision measurement is taken.

Description

[Detailed description of the invention] This development was performed using an NC machine tool and a three-dimensional coordinate measuring machine.
The present invention relates to a contact detection device that electrically detects that a contact has touched an object, generally referred to as a probe. For this contact detection, it is necessary to sensitively detect the contact, move the contact back accordingly when it hits the object, and accurately return to its original position when the contact with the object is removed. It is necessary to return to the original state, and a small and easy-to-operate device is desired.

Various contact detectors have been developed for this purpose. There is one example shown in ``Special Publication No. 17<021-Measurement Probe'', in which the fulcrum when the contactor contacts the object to be measured and moves is in electrical contact with the return mechanism. Therefore, it is not desirable to move in the first place. Since the support 1-1 moves every time a measurement is made, the return to the original position is not accurate and is not suitable for high-precision training. However, after the contactor returns to normal, there are six electrical contacts that must be electrically connected to each other, and the manufacturing adjustment requires a lot of work.

The present invention has a simple structure, is small in size, and always has an accurate return position, making it suitable for high-precision measurement. 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

Figure 1 shows the principle of the present invention, in which a fixed part 1 has a fulcrum 2.
is provided, and the first movable part 3 is pivoted on this. A first electrical contact 5 is provided between the branch portion 4 of the fixed part and the first driving member 3, and biasing means such as a tension spring 6 is provided to close this contact. A fulcrum 7 is provided in the first movable part ii 3 to pivotally support the second movable member 8.

A contactor 9 is provided at the lower end of the second movable member 8. Further, the first movable member 3 has a branch portion 1o, and the lower end and the second
A second electrical contact 11 is provided between the movable member 8 and a tension spring 12 so that the second contact 11 is normally closed.
Provide a biasing means such as

Now, a leftward force (-
When the force in the -X direction is released, the second movable part 8 rotates clockwise about the fulcrum 7 and opens the second contact 11 (.And when the force in the -X direction is released, the tension spring 2 is released. , the second movable member 8 returns to its original position. Conversely, when the rightward force (+ ' ``T.O.
l The member 3 rotates in the counterclockwise direction about the fulcrum 2 to open the first contact 5. Then, when the tension suit is released, the first movable part 43 is pivoted by this.7. Second Town Movement Department @8
and returns to its original position.

There is an embodiment of a contact detection device 1 shown in FIG. 2 which 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 drawings will be described using the same numbers. 1
The fixed part forms an outer cylinder of the contact detection device. Reference numeral 3 denotes a first movable member rotatably supported by the fixed portion 1 at a fulcrum 2, which has an inverted shape in the illustrated example. Reference numeral 8 denotes a second (i3') movable member rotatably supported by the movable member (3) at a fulcrum 7, and a contactor (9) is provided at the tip thereof. Reference numeral 13 denotes a contact pin which is electrically insulated by an insulating bushing 14 and implanted in the branch part 4 in the fixing part 1, and the first contact point 13 is located at a position opposite to this.
A first electrical contact 5 is formed between the iJ moving member 3 and the contact plate 15. Reference numeral 16 denotes a contact pin which is electrically insulated and implanted at the end of the second movable part 8 opposite to the contact 9 with an insulating bushing 17; A second electrical contact 1 is provided between the member 3 and the contact plate 18.
1 is formed. 6 is a tension spring that biases the first movable member 3 in the direction of the branch portion 4 about the fulcrum 2; and 12 is a tension spring that biases the second movable member 8 about the fulcrum 7 It is a tension spring that biases the member 3 in the direction. Therefore, at all times, that is, when no external force is applied to the contactor 9 in the +X direction or -X direction, the contact pin 13 and the contact plate 15 and the contact pin 16 and the contact plate 1B
As shown in the figure, the second movable member 8 maintains a vertical position with respect to the fixed part 1, that is, the original position. 20
．． 21 are connected to the contact pins 13 and 16, respectively, and are guided to the outside of the fixed part 1 by a cord and connected to a power source (not shown).Therefore, the cord 20, the contact pin 13, the contact plate 15, and the first movable member 3. An electrical circuit made of stone rows consisting of a contact plate 18, a pressure point bead 6, and a cord 21 is constructed.

In this structure, the right side of the contact 9 is now in contact with the fixed object (not shown), and the contact 9IJ: -X
When moving in the direction, the first movable member 3 and the second movable member 8 maintain the state shown in the figure, that is, the contact pin 16 and the contact plate 18 maintain the contact state and move the fulcrum 2. The center rotates clockwise against the tensile force of the tension spring 6, and the contact pin 13 and the contact plate 15 are separated from each other, and -C electrical continuity is interrupted. In other words, the contact 9 touches the object to be measured.
The position of the object to be measured can be detected with high accuracy by detecting the lever 'i1, which causes the first electrical contact 5 to be disconnected at the moment of displacement in the C-X direction, using an appropriate detection device. reactor. Next, when the contact between the contactor 9 and the object to be measured is released, the action of the tension spring 6 moves the movable member 3 so that the contact plate J5 comes into contact with the contact pin 13 and moves to the opposite direction 1i.
' Ji moves and the contact 9 returns to the origin position tkt.

Next, the left side of the contact 9 comes into contact with the object to be measured, and the contact 9
When moving in the X direction, the second +sJ moving member 8 moves counterclockwise around the fulcrum 7 against the tensile force of the tension spring 12. ζ
When the contact pin 6 and the contact plate 18 are rotated, the electrical continuity of the second electrical contact 11 is cut off between the contact pin 6 and the contact plate 18, and the position of the object to be measured can be detected accurately as in the case described above. . Next, in order to release the contact between the contact 9 and the object to be measured, the second movable member 8 is rotated clockwise by the action of the tension spring 12 until it comes into contact with the contact pin 16 or the contact plate 18, and the contact 9 is released. returns to the origin position.

FIG. 3 shows another embodiment of the contact detection device of the present invention,
A first movable member 3 is rotatably supported on the fixed part 1 at a fulcrum 2, and a second movable member 8 is rotatably supported on the first driving part 43 at a fulcrum 7.
At the time 1IIIJ'r+T, the fixed part 1 is
and the 11th J moving part 3, and the 4th electric contact 5 is connected to the 1st
It is the same as in the embodiment shown in FIG. The difference is that one tension spring 6 as a return means is provided in every fourth of the fixed part and the second movable member 8, or the effect is exactly the same.

In addition, in any of the above embodiments, the fulcrums 2 and 7
Although the explanation is given using a j-shaped bearing as an example, it 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, the contact detection device of the present invention has a simple structure in which the fulcrum and the electric contact are separately provided, and the electric contact detects the moment when the contact contacts the object to be measured and is displaced. It can be detected with high precision as a temporary probe. 2! ! When the contact with the θ1j constant object is released, it can quickly and accurately return to the origin position, which is a remarkable effect.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the process of the present invention. FIG. 3 is a side sectional view of one embodiment of the present invention, and FIG. 3 is a side sectional view of another embodiment of the misfire prevention. l: Fixed part 3: First movable member 5: First electric contact 8: Second movable member 9: Contactor II: Second electric contact Patent applicant Tokyo M-M Co., Ltd.

Claims (1)

[Claims] A first movable member is pivotally supported on the fixed part, and a second movable member is supported on the first movable member.
The movable member is pivotally supported, a contact is provided at the tip of the second movable part, and a first electrical contact is provided between the fixed part and the first movable part.
A second electrical contact is provided between the movable member and the second movable member, and biasing means is provided for biasing the movable member toward the fixed portion and the second movable member toward the first movable portion. This is a special iron and roller contact detection device.