JP3009571B2 - Inside and outside measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method in which a pair of measuring elements are brought into contact between measuring portions of an object to be measured. The present invention relates to an inner / outer measuring device for measuring an outer dimension (for example, an outer diameter dimension of a shaft, a width dimension of a projection, etc.), and in particular, guides a pair of measuring elements between measurement sites of an object to be measured. To improve the guide to do.

[0002]

2. Description of the Related Art In an automatic production line, the inside and outside dimensions of an object to be measured are automatically measured using an inside and outside measuring device. This automatic measurement is performed by bringing a pair of measuring elements into contact between the measurement sites of the object to be measured and measuring the inner and outer dimensions of the object to be measured from the dimensions between the measuring elements at that time. At the time of measurement, it is necessary to position a pair of probes in advance between the measurement sites of the DUT,
A guide for guiding a pair of tracing styluses between measurement sites of a device under test is provided in the inner and outer measuring devices. In a conventional guide, a guide having a dimension slightly smaller than the distance between the measurement sites of the object to be measured (conventional example I) and an inner diameter measuring device such as a cylinder gauge are supported at the center of the device body and have a tip portion. There is a guide plate that is pressed against an object to be measured (conventional example II).

[0003]

However, in the conventional example I, since the dimension between the measuring parts of the object to be measured and the allowable measurement range correspond one to one, the measuring stroke is smaller than the outer dimension of the guide. There is a problem that it cannot be enlarged. In Conventional Example II, the guide plate must support the weight of the inner diameter measuring device.Therefore, in order to overcome the weight of the measuring device and the friction between the device and the object to be measured, the guide plate is attached to the object with a large driving force. I have to push it. For this reason, there is a problem that an object to be measured is deformed and a measurement error occurs.

[0004] It is an object of the present invention to provide an inner / outer measuring apparatus capable of increasing the measuring stroke and avoiding the deformation of the object to be measured and capable of accurate measurement.

[0005]

Therefore, an inner and outer measuring device according to the present invention comprises a casing, a pair of measuring elements in contact with an object to be measured, and a pair of these measuring elements interposed between measuring portions of the object to be measured. In the inner / outer measuring apparatus having a pair of guides for guiding, the pair of guides can be approached and separated from each other, and the pair of tracing stylus approach each other on a vertical bisector between the pair of guides. In the casing, a rotation plate having a rotation center about an axis parallel to the separation direction is attached rotatably inside the casing,
A pair of tracing stylus and a pair of guides are respectively attached to the rotating plate, and a rotating plate is provided between the pair of guides and the rotating plate when one of the pair of guides contacts an object to be measured. And a centering mechanism for rotating is provided. Here, the alignment mechanism is provided on the pair of guides and extends in the directions of approach and separation of the pair of guides, and a plurality of racks mesh with the racks and rotate around the rotating plate. A configuration may be provided in which a pinion movably provided and a rotation drive source for rotating the pinion are provided, and the plurality of racks are arranged to face each other with the pinion interposed therebetween.

[0006]

For example, in the case of measuring the outer diameter, a pair of measuring elements and a pair of guides are arranged with the axis of the object to be measured interposed therebetween. In the case of measuring the inner diameter, a pair of measuring elements and a pair of measuring elements are placed in the hole of the object to be measured. Insert a pair of guides. In this state, the apparatus is held, and the pair of guides are moved toward or away from each other so as to contact the object to be measured. When one of the pair of guides comes into contact with the object to be measured, the rotating plate is rotated by the centering mechanism. Then, the pair of tracing stylus and the pair of guides also rotate together with the rotating plate. Even if the one guide comes into contact with the object to be measured, it continues to move until the other guide comes into contact with the object to be measured. The measurement is performed by a pair of tracing styluses approaching or separating from each other, but regardless of the holding posture of the device, since the pair of tracing stylus are located on a perpendicular bisector between the pair of guides, It is always on the axis of the DUT or on the core of the hole of the DUT.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. In the present embodiment, a hole of an object to be measured is measured. FIG. 1 is a perspective view thereof, and FIG. 2 is a sectional view thereof. In FIG. 1, an inner / outer measuring device 1 includes a cylindrical casing 2 having both ends closed.
Are formed at one end with four holes 2A at equal intervals. A pair of tracing styluses 3 and 4 that come into contact with the object to be measured so as to protrude from the holes 2A, and a pair of guides 5 that guide the pair of tracing stylus 3 and 4 between measurement sites of the object to be measured. 6 are arranged. The straight line connecting the pair of probes 3 and 4 and the straight line connecting the pair of guides 5 and 6 are
Are orthogonal to each other on the axis.

In FIG. 2, the pair of probes 3 and 4
Are each formed in a substantially prismatic shape, and are provided with measuring spheres 3A and 4A at their distal ends. The pair of tracing styluses 3 and 4 are arranged to be close to and separated from each other by a tracing stylus driving mechanism 7. The structure of the tracing stylus drive mechanism 7 is also shown in FIG. In FIGS. 2 and 3, a tracing stylus drive mechanism 7 includes arms 9 and 10 in which base ends of a pair of tracing styluses 3 and 4 are attached with set screws 8.
The sliders 11 and 12 which are attached and which are reciprocally movable in the direction in which the measuring elements 3 and 4 approach and separate from each other, and extend in the direction in which the measuring elements 3 and 4 approach and separate from each other on opposing surfaces of the sliders 11 and 12. Formed rack 13,
14, a pinion 15 meshed with the racks 13 and 14, and a motor 16 as a rotation drive source for rotating the pinion 15 forward and reverse. When the pinion 15 is rotated clockwise in FIG. 3 by the motor 16, the slider 11, the arm 9, and the tracing stylus 3 and the slider 12, the arm 10, and the tracing stylus 4 approach each other,
When the pinion 15 rotates counterclockwise, the slider 1
1, arm 9 and tracing stylus 3 and slider 12, arm 1
0 and the probe 4 are separated from each other.

A detector 17 is provided between the arms 9 and 10 for detecting the relative movement of the pair of probes 3 and 4. The detector 17 is provided with a main scale 18 provided on the arm 9 along the approach and separation directions of the tracing styluses 3 and 4.
And an index scale 19 provided on the arm 10. Each of the arms 9 and 10 is provided with a strain cage (not shown) for detecting the amount of bending of the arms 9 and 10 as an electric signal, and the amount of bending of each of the arms 9 and 10 detected by the strain gauge is set in advance. When the value reaches the value, the movement amount of the detector 17 is taken in as a measured value.

In FIGS. 1 and 2, the pair of guides 5 and 6 are each formed in a substantially prismatic shape, and are provided with guide balls 5A and 6A at their distal ends. The pair of guides 5 and 6 are arranged to be close to and separated from each other by the centering mechanism 20. The structure of the centering mechanism 20 is also shown in FIG. 2 and 4, the centering mechanism 20 includes arms 22, 23 in which the base ends of a pair of guides 5, 6 are attached with set screws 21;
Sliders 24, 25 which are attached to and which are reciprocally movable in the direction of approaching and separating the guides 5, 6 are formed on surfaces of the sliders 24, 25 facing each other so as to extend in the direction of approaching and separating the guides 5, 6. Rack 26,
27, a pinion 28 meshed with the racks 26, 27, and the motor 16 for rotating the pinion 28 forward and reverse. When the pinion 28 is rotated clockwise in FIG. 4 by the motor 16, the slider 24, the arm 22, and the guide 5 and the slider 25, the arm 23, and the guide 6 come close to each other, and the pinion 28
Rotates counterclockwise, the slider 25, arm 2
2 and the guide 5 are separated from the slider 25, the arm 23 and the guide 6.

The pinion 28 has a cylindrical portion 28A,
The cylindrical portion 28A is rotatably attached to a rotating plate 30 via a bearing 29. This rotating plate 30 is a rotating shaft 3
1 is attached to the inside of the casing 2 so as to be freely rotatable, and the center of rotation is an axis parallel to the approach and separation directions of the measuring elements 3 and 4. Therefore, the centering mechanism 20 having the above-described configuration is used.
In the state where both the pair of guides 5 and 6 do not come into contact with the object to be measured, both guides 5 and 6 are brought close to and away from each other.
When only one guide of the pair of guides 5 and 6, for example, the guide ball 5A of the guide 5, comes into contact with the object to be measured, the reaction generated on the guide ball 5A causes the rotation plate 30 to be separated from the guide ball 5A by a predetermined distance. A pair of guides 5 and 6 are rotated by a rotation moment. A support member 32 for movably supporting the sliders 24 and 25 is attached to the rotating plate 30 (see FIG. 2).

The pinion 15 of the tracing stylus drive mechanism 7 has a cylindrical portion 15A, which is disposed inside the cylindrical portion 28A of the pinion 28 at a predetermined interval. The pinion 15 and the pinion 28 are linked by an interlocking mechanism 33.
Are connected by The structure of this interlocking mechanism 33 is also shown in FIG. 2 and 5, the interlocking mechanism 33
A ring member 34 fixed to the cylindrical portion 15A of the pinion 15, a pin 35 protruding in parallel with the axial direction of the ring member 34, and an engagement groove 36A engaged with the tip of the pin 35 are formed around the ring member 34. A ring member 36 formed over a predetermined length in the direction and fixed to the end of the cylindrical portion 28A of the pinion 28, and a coil spring 37 connected between the ring member 36 and the ring member 34 The pin 35 is normally in contact with the right end of the engagement groove 36A in FIG. When the pinion 15 is rotated counterclockwise in FIG. 5 by the motor 16, the pinion 28 is also rotated in the same direction as the pinion 15 via the coil spring 37, and the pair of tracing styluses 3 and 4 and the pair of guides 5 6 move in the direction in which both of the guides 5 and 6 are restricted, and when the rotation of the pinion 28 stops, the coil spring 37
The ring member 34 continues to rotate until the pin 35 contacts the left end of the engagement groove 36A in FIG. 5 so that only the pinion 15 continues to rotate,
Only four are separated from each other.

As shown in FIG. 2, the ring member 34
Is supported by a guide ring 38 so as to be freely rotatable in the circumferential direction. The guide ring 38 is attached to the rotating plate 30 by a coil spring 39. The motor 16 is fixed to a motor mounting plate 40. The motor mounting plate 40, the pair of tracing styluses 3, 4, the tracing stylus driving mechanism 7, and the detector 17 constitute a measuring unit 41. As shown in FIG. Is attached to the rotating plate 30 via two leaf springs 42, which are elastic members that allow movement in the proximity and separation directions. Two leaf springs 42
Are arranged in parallel with each other and the motor mounting plate 40
And the rotating plate 30 form a parallel link. A bracket 30A is formed below the one leaf spring 42 on the rotating plate 30, and a measuring unit 41 is attached to the bracket 30A.
A counterbalance 43 is provided to offset the weight of the counter.

As shown in FIG. 2, a lock mechanism 44 for restricting the rotation of the rotary plate 30 is provided between the rotary plate 30 and the casing 2. The configuration of the lock mechanism 44 is also shown in FIG. 2 and 7, the lock mechanism 44 includes an engagement plate 45 fixed to the casing 2 and having an engagement recess 45A formed therein.
A cross-shaped cam member 46 whose end can be engaged with the engaging recess 45A, and a motor 47 that rotates the cam member 46 and is fixed to the rotating plate 30. 47 rotates the cam member 46 by 45 degrees, thereby engaging or disengaging the engagement concave portion 45A with the cam member 46. The center of gravity of the pair of guides 5 and 6, the centering mechanism 20, the rotating plate 30, the motor mounting plate 40, the measuring unit 41, the leaf spring 42, the counterbalance 43, and the motor 47 is the center of rotation of the rotating plate 30. At the intersection X between the pinion and the axis of the pinion.

Next, the operation of this embodiment will be described with reference to FIGS. First, the rotation plate 30 is locked by operating the lock mechanism 44, and in this state, the pair of tracing styluses 3, 4 and the pair of guides 5, 6 are inserted into the hole H of the DUT. In this state, as shown in FIG.
Is displaced from the axis M of the hole H by an angle θ.

Thereafter, the rotation plate 30 is rotated by the lock mechanism 44.
Is unlocked, and the motor 16 is driven in a state where the posture of the inner / outer measuring device 1 is held to rotate the pinion 15 of the tracing stylus driving mechanism 7 in the counterclockwise direction in FIG. Then, the pinion 28 of the centering mechanism 20 is also rotated in the same direction via the interlocking mechanism 33, and the rotation of these pinions 15, 28 separates the pair of tracing styluses 3, 4 and the pair of guides 5, 6 from each other. . When only the guide 6 of the pair of guides 5 and 6 comes into contact with the hole H of the measured object, as shown in FIG.
The alignment mechanism 20 rotates the rotating plate 30 and the members such as the pair of tracing styluses 3 and 4 attached to the rotating plate 30 clockwise. Then, even if one of the guides 6 contacts the hole H of the measured object, the other guide 5 moves toward the hole H of the measured object. As shown in FIGS. 8C and 9, when both of the pair of guides 5 and 6 come into contact with the hole H of the measured object,
A pair of probes 3 and 4 are guided between the measurement sites. That is,
Since the pair of tracing styluses 3 and 4 are located on the perpendicular bisector between the pair of guides 5 and 6, the tracing stylus 3 and 4 are located on the core of the hole H of the measured object.

When both of the pair of guides 5 and 6 come into contact with the hole H of the measured object, the rotation of the pinion 28 stops, but the ring member 34 resists the urging force of the coil spring 37 of the interlocking mechanism 33. And the pinion 15 continues to rotate, and the pair of tracing styluses 3 and 4 keeps separating. The movement of the tracing styluses 3 and 4 is continued until the pin 35 contacts the left end of the engagement groove 36A in FIG. When only one probe 4 of the pair of probes 3 and 4 comes into contact with the hole H of the object to be measured, the entire measurement unit 41 resists the urging force of the leaf spring 42.
4 moves in the approaching and separating directions, and the counterbalance 43 rotates with this movement (see the imaginary line in FIG. 6). This movement is caused when both of the pair of probes 3 and 4
And the detector 17 detects the relative movement amount of the pair of tracing styluses 3 and 4 when both of the tracing stylus 3 and 4 contact the hole H.

Therefore, according to the present embodiment, the pair of guides 5 and 6 can be moved closer to and away from each other, so that the measuring stroke can be increased irrespective of the size of the hole H of the object to be measured. In addition, the pair of tracing styluses 3 and 4 can be approached and separated from each other on a vertical bisector between the pair of guides 5 and 6, and the approach and separation directions of the tracing stylus 3 and 4 are set inside the casing 2. A rotation plate 30 having a parallel axis as a rotation center is rotatably mounted, and a pair of tracing styluses 3 and 4 and a pair of guides 5 and 6 are mounted on the rotation plate 30 so that a pair of guides 5 and 6 and Since the centering mechanism 20 for rotating the rotating plate 30 when one of the guides 5 of the pair of guides 5 and 6 contacts the hole H of the measured object is provided between the guide 5 and the rotating plate 30, , 6 move together, the force of the guide 6 pushing the hole H does not increase due to the rotation of the rotating plate 30, and the pair of tracing styluses 3, 4 Vertical 2 between
Since it is on the equal line, that is, on the center of the hole H of the DUT,
Accurate measurement can be performed while avoiding deformation of the object to be measured. This effect can be achieved regardless of the holding posture of the device during measurement. That is, in a state where the pair of guides 5 and 6 are in contact with the hole H, even if the straight line connecting the tips of the guides 5 and 6 does not coincide with the radial direction of the hole H, the pair of tracing stylus 3 and 4 can be used. Since it is on the perpendicular bisector between the pair of guides 5 and 6, accurate measurement can be performed.

In this embodiment, the guides 5 and 6 are provided on the pair of guides 5 and 6, respectively.
6, a plurality of racks 2 formed to extend in the proximity and separation directions
6, 27, a pinion 28 meshed with each of the racks 26, 27 and rotatably provided on the rotating plate 30, and a motor 16 for rotating the pinion 28.
And the centering mechanism 20 is configured,
It functions not only when one guide 6 contacts the hole H to rotate the rotary plate 30 but also when both the guides 5 and 6 not in contact with the hole H are moved. Are shared and the device becomes compact. Further, since the motor 16 constituting the alignment mechanism 20 is also used as a drive source of the tracing stylus drive mechanism 7, the apparatus can be made compact from this point as well.

In this embodiment, a pair of tracing stylus 3
4. Since the measuring unit 41 including the tracing stylus drive mechanism 7 and the detector 10 is attached to the rotary plate 30 via the leaf spring 42 which allows the tracing stylus 3 and 4 to move in the approaching and separating directions, a pair of tracing stylus The measurement can be performed in a state where both of 3 and 4 are in contact with the hole H of the measured object with an appropriate measurement pressure, and the measurement accuracy of the measuring device can be improved. In addition, since the tracing styluses 3 and 4 are driven by one motor 16, the structure is simple. Further, two leaf springs 42 are prepared, and these leaf springs 4
Since the parallel link is formed by the rotation plate 2, the rotating plate 30, and the motor mounting plate 40, the measuring elements 3 and 4 of the measuring unit 41 can be reliably moved in the approaching and separating directions, and the measuring accuracy can be improved.

Further, since the counterbalance 43 for offsetting the weight of the measurement unit 41 is attached to the rotating plate 30, the counterbalance 43 is not affected by the weight of the measurement unit 41. Therefore,
In order to equalize the measuring force of the measuring elements 3 and 4 and reduce the measuring force,
Errors due to the holding posture of the device can be reduced. The center of gravity of the pair of guides 5 and 6, the alignment mechanism 20, the rotating plate 30, the motor mounting plate 40, the measuring unit 41, the plate spring 42, the counterbalance 43, and the motor 47 is
Is located at the intersection X between the center of rotation and the axis of the pinion 28 of the alignment mechanism 20, no moment is generated with the rotation of the guides 5 and 6, so that appropriate measurement can be performed.

Further, since the lock mechanism 44 for restricting the rotation of the rotary plate 30 is provided between the rotary plate 30 and the casing 2, when the measuring elements 3, 4 and the guides 5, 6 are inserted into the hole H, In addition, it is possible to prevent the guides 5 and 6 from rotating by mistake and interfering with the object to be measured. Further, the pinion 15 of the tracing stylus moving mechanism 7 and the pinion 28 of the alignment mechanism 20 are connected to the interlocking mechanism 33.
Thus, even if the rotation of the pinion 28 of the alignment mechanism 20 is stopped, the pinion 15 of the tracing stylus moving mechanism 7 is rotated to operate the tracing styluses 3 and 4, so that appropriate measurement can be performed.

In the above embodiment, the inner and outer measuring devices 1
Was used as the inner diameter measurement, but in the present invention, it can be used as the outer diameter measurement for measuring the outer diameter dimension of the shaft of the measured object. Further, the elastic members that allow the measuring elements 3 and 4 of the measuring unit 41 to move in the approaching and separating directions are two leaf springs 42, but this leaf spring 42 is omitted and the measuring unit 41 is May be fixed. Even if an elastic member is used, the configuration does not need to be the leaf spring 42, and rubber or the like may be used instead of the leaf spring 42.

Further, it is not always necessary to provide the lock mechanism 44. Even if the lock mechanism 44 is provided, the configuration is such that an engagement plate fixed to the casing 2 and having an engagement hole, an engagement rod engageable with the engagement hole, and the engagement rod A drive mechanism including a rack and a pinion for driving forward and backward may be used. Further, the driving sources of the tracing stylus moving mechanism 7 and the alignment mechanism 20 may be separate motors. Furthermore, a pair of guides 5 and 6 are brought close to each other,
A pressure source sensor for separately providing a drive source for separating and a drive source for rotating the rotary plate 30, and for detecting that the tips of the guides 5, 6 have contacted the object to be measured, respectively. May be provided, and the rotation plate 30 may be rotated when the pressure detection sensor detects that one of the guides 5 contacts the object to be measured.

[0025]

As described above, according to the present invention, a pair of guides can be made to approach and separate from each other, and a pair of probes can be made to approach and separate from each other on a perpendicular bisector between the pair of guides. A rotating plate is pivotally mounted inside the casing around an axis parallel to the approach and separation directions of the measuring element, and a pair of measuring elements and a pair of guides are attached to the rotating plate, respectively. Since a centering mechanism is provided between the guide and the rotating plate for rotating the rotating plate when one of the pair of guides comes into contact with the workpiece, the measuring stroke can be increased and the workpiece can be deformed. Thus, there is an effect that accurate measurement can be performed while avoiding the problem. Furthermore, while being provided in each of the pair of guides, the proximity of the pair of guides,
The rack includes a plurality of racks extending in the separation direction, a pinion that meshes with each of the racks and is rotatably provided on a rotary plate, and a rotary drive source that rotates the pinion. If the core mechanism is configured, the components are shared and the device becomes compact.

[Brief description of the drawings]

FIG. 1 is a perspective view of an inner and outer measuring device according to one embodiment of the present invention.

FIG. 2 is a sectional view thereof.

FIG. 3 is a perspective view of a tracing stylus driving mechanism.

FIG. 4 is a perspective view of a centering mechanism.

FIG. 5 is a perspective view of an interlocking mechanism.

FIG. 6 is a cross-sectional view showing a mounting state of the measurement unit.

7 is a sectional view taken along the line VII-VII in FIG.

FIGS. 8A to 8C are schematic diagrams illustrating the operation of the embodiment.

FIG. 9 is a front view illustrating the operation of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inner / outer measuring device 2 Casing 3, 4 Measuring element 5, 6 Guide 7 Measuring element drive mechanism 17 Detector 20 Alignment mechanism 26, 27 Rack 28 Pinion 30 Rotating plate 33 Interlocking mechanism 41 Measuring unit 42 Elastic member (plate spring) ) 43 Counter balance 44 Lock mechanism

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G01B 21/00-21/32 G01B ^7/ 00-7/34

Claims (2)

(57) [Claims] 1. An inner / outer measuring apparatus having a casing, a pair of measuring elements in contact with an object to be measured, and a pair of guides for guiding the pair of measuring elements between measurement sites of the object to be measured. The pair of guides can be approached and separated from each other, the pair of probes can be approached and separated from each other on a perpendicular bisector between the pair of guides, and the probe is provided inside the casing. A rotating plate is pivotally mounted about an axis parallel to the approach and separation directions, and a pair of measuring elements and a pair of guides are mounted on the rotating plate, respectively. An inner / outer measuring apparatus, wherein a centering mechanism for rotating a rotating plate when one of a pair of guides contacts an object to be measured is provided between the inner and outer measuring devices. 2. The inner and outer measuring device according to claim 1, wherein
The alignment mechanism is provided on the pair of guides, and is formed with a plurality of racks formed to extend in the proximity and separation directions of the pair of guides. An inside / outside measurement device comprising: a pinion provided; and a rotation drive source for rotating the pinion, wherein the plurality of racks are arranged to face each other across the pinion.