JP2551607Y2 - Displacement measurement probe device - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention is used, for example, in a three-dimensional coordinate measuring machine and the like, in which a stylus is mounted on a holding member which can be displaced in at least two axial directions with respect to an apparatus body, and this stylus is inspected. The present invention relates to a displacement measuring probe device provided with a clamp device for contacting an object and reading a displacement amount of the holding member, the clamp device restraining the holding member.

[0002]

2. Description of the Related Art In a three-dimensional coordinate measuring machine or the like, a stylus is provided on a holding member which can be displaced in a plurality of axial directions, and a minute displacement amount of the holding member when the stylus comes into contact with an object is read. These are known, for example, as disclosed in Japanese Patent Publication No. 54-6218. Since the structure for making the holding member movable is precise, it is necessary to fix and restrain the holding member so as not to receive an impact when exchanging the probe, moving or transporting the probe.

Conventionally, in order to fix a holding member, a fixing member having a V-groove provided in a movable portion of a guide portion of each shaft which enables the holding member to be displaced is fixed to the V-groove. There is known a device provided with a clamp device for pressing a ball to fix a holding member, and a small motor, a voice coil, an electromagnet, or the like is used as power for pressing the ball.

[0004]

However, such a conventional technique requires a driving power for pressing the ball of the clamp device, so that the mechanism becomes large and wiring for power supply becomes complicated. There was a point.

[0005] Further, it is not easy to perform the operation manually because the clamping devices are provided on the guide portions of the respective shafts, so that various constituent members hinder the operation.

SUMMARY OF THE INVENTION The present invention has been made in view of such problems of the prior art, and has as its object to provide a displacement measuring probe device having a clamp device which can be reduced in size and has a simple structure. I have.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the gist of the present invention is as follows: 1. A measuring element is mounted on a holding member which can be displaced in at least two axial directions with respect to an apparatus main body, and the measurement is performed. The probe is brought into contact with a test object to read the amount of displacement of the holding member, and in a displacement measurement probe device including a clamp device that restrains the holding member, the clamp device is configured to center the holding member. A cam member rotatably provided in the apparatus main body as a center of rotation and having spiral cam grooves at equal intervals around the holding member; and engaging with the cam groove and freely moving in the center direction of the holding member. Is held in the device body,
A displacement measuring probe device, comprising: a clamp claw that restrains the holding member by rotation of the cam member.

2. A click device is provided between the cam member and the apparatus main body, the click device being configured to restrain the cam member when the clamp claw releases the clamp of the holding member. Displacement measurement probe device.

3. The displacement measuring probe device according to claim 2, further comprising a detection switch that operates when the clamp claw releases the restraint of the holding member and the click device restrains the cam member. Exist.

In the first aspect of the present invention, the cam member may be driven by power or manually, and another mechanism for driving may be provided. The invention of item 2 is effective in the case of manual operation, but can also be applied in the case of power. In the invention of item 3, it is effective to use the displacement operation of the click device. However, the invention of item 3 may simply detect the operation of the cam member.

[0011]

The measurement is performed by bringing the probe into contact with the test object with the holding member released from the clamp device. When the probe comes into contact with the test object, the holding member is displaced with respect to the apparatus main body, and the amount of the displacement is read by an encoder, an operation transformer, or the like.

The holding member is fixed when there is a risk that the holding member will be subjected to an impact, such as when the probe is replaced, moved, or transported. The cam member is rotatably provided in the apparatus main body around the center of the holding member, and when the cam member is rotated by power or manually, each clamp claw engaged with each cam groove of the cam member causes the rotational displacement of the cam groove. In the direction toward the center axis of the holding member, and the clamp claws symmetrically disposed at equal intervals nip the holding member without bias,
The holding member is fixed.

Since the holding member is fixed, when the probe is replaced or the apparatus is moved, the holding member is not inadvertently vibrated and does not receive an impact, and the precise mechanism is protected.

To release the fixed holding member, the cam member is rotated in the opposite manner to the above. Each clamp claw retreats in a direction away from the central axis of the holding member in accordance with the rotational displacement of the cam groove of the cam member, and the restraining of the holding member is released. With the click device, the position of the cam member is determined and restrained when the restraint of the holding member is released. When it is desired to fix the holding member, the cam member is rotated with a force larger than the holding force of the click device, and each clamping claw is projected toward the center to clamp the holding member.

In the apparatus provided with the detection switch, when the holding member is opened and the click device is operated, the detection switch is operated to notify the release of the restraint, so that the holding member can be reliably opened and the detection signal is output. Can be used for various controls.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of the present invention.

The holding member 1 is held so as to be displaceable with respect to an apparatus main body (not shown). The holding member 1 can be displaced in at least two axial directions, that is, a horizontal direction and a vertical direction in FIG. 1 and a vertical direction in FIG. At the front end of the holding member 1, measuring elements 9, 9,... Protruding in three axial directions are mounted. The displacement measuring probe device A is for bringing the tracing styluses 9, 9,... Into contact with the test object from the respective directions as necessary, and reading and detecting the minute displacement of the holding member 1.

The displacement measuring probe device A has a holding member 1
Is provided if necessary. The clamping device B includes a disc-shaped cam member 6.
, Which are operated by the cam member 6.

A main body cover 2 which is a part of the apparatus main body is formed so as to cover the holding member 1 by being inserted therethrough, and a guide plate 3 is fixed to the main body cover 2. A rotating ring 4 is rotatably fitted on the guide plate 3 and a cam member 6 is rotatably held integrally with the rotating ring 4 between a cover plate 5 fixed to the lower surface of the rotating ring 4 and the guide plate 3. Have been.

Body cover 2, guide plate 3, cover plate 5,
There is an opening through the center of the cam member 6, through which the holding member 1 is inserted. The periphery of the rotary ring 4 forms a knob for rotating with a finger. The cam member 6 has a spiral cam groove 6 surrounding the holding member 1.
are formed symmetrically at equal intervals.

The guide plate 3 has radial guide grooves 3a,
Are formed at equal intervals corresponding to the cam grooves 6a, and the clamp claws 7, 7 are held in the guide grooves 3a, 3a so as to be able to advance and retreat in the center direction so that the holding member 1 can be clamped. I have. Each of the clamp claws 7, 7 is provided with a cam pin 8 projecting therefrom. The cam pins 8, 8 are engaged with the cam grooves 6a, 6a so that the clamp claws 7, 7. The holding member 1 is disposed so as to project therefrom.

A click device is provided between the cam member 6 and the main body cover 2 of the apparatus main body, and a detection switch that operates when the click device operates is provided.

A mounting member 10 is fixedly mounted on the front end surface of the main body cover 2, a holding hole 2a is formed in the front end surface of the main body cover 2, and a cylindrical hole 1 concentrically connected to the holding hole 2a.
0 a is bored in the mounting member 10.

A click ball 15 and a push rod 14 are inserted from the cylindrical hole 10a into the holding hole 2a, and a leaf spring 13 that resiliently presses the push rod 14 is provided. The rotary ring 4 is provided with a conical hole 4a into which a click ball 15 falls when the cam member 6 comes to the open position. With the above configuration, a click device in which the click ball 15 resiliently engages and disengages with the conical hole 4a is configured.

The contact plate 11 is connected to the leaf spring 1 via an insulating material 12.
3 together with the mounting member 10. Contact plate 11
Is arranged opposite to the leaf spring 13 so that the leaf spring 13 contacts and conducts when the click ball 15 falls into the conical hole 4a, and the detection switch is formed by the leaf spring 13 and the contact plate 11. It is configured.

Next, the operation will be described.

When the click ball 15 of the click device falls into the conical hole 4a of the rotating ring 4, the cam member 6 is in the open position, the cam pin 8 is located at the outermost end of the cam groove 6a, The pawl 7 is retracted, and the holding member 1 is inserted through the central opening of the main body cover 2, the guide plate 3, the cover plate 5, and the cam member 6 without being restrained.

Further, since the click ball 15 has fallen into the conical hole 4a of the rotating ring 4, the leaf spring 13 and the contact plate 11, which constitute the detection switch, are in contact with each other to conduct, and the holding member 1 Notifies that it is open and in a measurable state. The measurement of the test object is performed by bringing the probes 9 into contact with the test object in a state where the holding member 1 is released from the clamp device B as described above.

The direction in which the measuring elements 9, 9...
When the probe 9 comes into contact with the test object, the holding member 1 is displaced with respect to the apparatus main body by a reaction, and the displacement is used to detect the contact, and the coordinate value at that time is detected. Is recorded.

The holding member 1 is fixed when there is a possibility that the holding member 1 will be subjected to an impact, for example, when exchanging the measuring elements 9, 9,... When the user grips the knob on the peripheral edge of the rotating ring 4 and rotates the cam member 6 counterclockwise in FIG. 2 with a force greater than the holding force of the click device, the cam member 6 is integrated with the respective cam grooves 6a, 6a. To rotate.

The ball 15 of the click device is a rotating ring 4
, And rides on the surface of the rotary ring 4 so that the clamp claws 7, 7 are fitted in the guide grooves 3a, 3a and do not rotate, and the respective cam grooves 6a, 6a at the positions of the cam pins 8 are not rotated. ... and the distance between the center and the cam pin 8
Are moved toward the center, and the clamp claws 7, 7... Protrude toward the center according to the rotational displacement of the cam grooves 6a, 6a.

Since the holding member 1 is inserted through the center opening of the main body cover 2, the guide plate 3, the cover plate 5, and the cam member 6, the tips of the protruding clamp claws 7, 7. Touch The tips of the clamp claws 7, symmetrically arranged at equal intervals hold the holding member 1 without bias, and the holding member 1 is fixed so as not to be displaced. When the click ball 15 of the click device is disengaged from the conical hole 4a of the rotary ring 4, the push rod 14 pushes up the leaf spring 13 and separates it from the contact plate 11, so that the leaf spring 13 is pushed up and is separated from the contact plate 11. The conduction is stopped, and the detection switch is deactivated to notify that the holding member 1 is restrained.

If the holding member 1 is fixed as described above,
When the tracing styluses 9 are exchanged or the apparatus is moved, the holding member 1 is not inadvertently vibrated and does not receive an impact, and the precise mechanism is protected.

To release the fixed holding member 1, the cam member 6 is rotated clockwise in FIG. Each of the clamp claws 7, 7,... Retreats radially in accordance with the rotational displacement of the cam grooves 6a, 6a,. When the click device is completely opened, the click ball 15 of the click device falls into the conical hole 4a of the rotating ring 4, and the position of the cam member 6 is determined and restrained.

When the click ball 15 of the click device falls into the conical hole 4a of the rotary ring 4, the push rod 14 is displaced downward in FIG. 1, and the contact plate 11 and the plate spring 13 which have been separated come into contact with each other. Contact and conduct. That is,
When the click device operates with the holding member 1 opened, a detection switch constituted by the contact plate 11 and the leaf spring 13 operates to notify the opening. Thus, the opening operation of the holding member 1 is confirmed, and the detection signal is used for various controls.

Incidentally, the cam member 1 may be driven by power or another mechanism for driving may be provided. Although it is effective to use the displacement operation of the click device, the detection switch may simply detect the operation of the cam member.

[0037]

According to the displacement measuring probe device of the present invention, a plurality of clamp claws are advanced and retracted in accordance with the rotation of the cam member, and the holding member equipped with the tracing stylus is restrained or released. With such a configuration, the holding member can be easily restrained as needed, and the displacement measuring probe device can be reduced in size and weight and can be used easily.

With the click device, when the cam member is completely opened, the position of the cam member is fixed and restrained, and the operation can be reliably performed. With the detection switch, the opening and restraint of the holding member are detected by the switch. The operation described in (1) above allows the opening operation of the holding member to be reliably performed, and the detection signal can be used for various controls to provide a reasonable displacement measurement probe device.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a displacement measuring probe device according to an embodiment of the present invention.

FIG. 2 is a view taken along line II-II in FIG.

[Explanation of symbols]

 A: Displacement measuring probe device B: Clamping device 1: Holding member 2: Body cover 3: Guide plate 4: Rotating ring 4a: Conical hole 6: Cam member 6a: Cam groove 7: Clamping claw 8: Cam pin 9: Measuring element 11 ... Contact plate 13 ... Leaf spring 14 ... Push rod 15 ... Ball for click

Claims (3)

(57) [Scope of request for utility model registration] 1. A stylus is mounted on a holding member displaceable in at least two axial directions with respect to an apparatus body, and the stylus is brought into contact with a test object to read a displacement amount of the holding member. A displacement measuring probe device provided with a clamp device for restraining the holding member, wherein the clamp device is rotatably provided on a device body around a center of the holding member as a rotation center, and has a spiral shape around the holding member. A cam member having cam grooves at regular intervals; a clamp claw engaged with the cam groove and movably held in a center direction of the holding member by the apparatus main body, and restraining the holding member by rotation of the cam member. And a displacement measuring probe device comprising: 2. A click device is provided between said cam member and said apparatus main body, said click device restraining said cam member when said clamp claw releases clamping of said holding member. The displacement measuring probe device according to the above. 3. A displacement measuring probe device according to claim 2, further comprising a detection switch which operates when said clamp pawl releases said restraint of said holding member and said click device restrains said cam member. .