JPH10332358A - Measuring head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent surplus force from being applied to a measuring filler so as to enable good-accuracy measurement by positioning a material to be measured by plural guides arranged on the tip of a head supported by a floating unit and measuring the dimensions of the material to be measured positioned by the measuring filler. SOLUTION: Air is supplied to an air supply port 302 to raise a piston 301, and the tip of a first shaft 31 is brought into contact with the lower end of a filler opening and closing ring 33 to move the filler opening and closing ring 33 upward. The engagement of the other end L-shaped projection 57 of a lever 51 and the ring 33 is released so that the lever 51 and the measuring filler 5 are slid by the energizing force of a spring 55, and a semispherical contact part 59 formed on the tip of the measuring filler 5 is brought into contact with two places of the inner peripheral wall of the material 6 to be measured. The insert amount of a core shaft 56 in a differential transformer 2 is detected to measure the inside diameter. By plural guides 4 arranged on the tip of the main body 1, the material 6 to be measured 6 is positioned so that surplus force is not applied.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a plurality of guides disposed at the tip of a head body supported by a floating unit and positioned to abut on an object to be measured by abutting against the object. The present invention relates to a measuring head for measuring a dimension of the positioned object to be measured by a measuring feeler.

[0002]

2. Description of the Related Art A conventional ball groove measuring device (Japanese Patent Laid-Open No. Sho 62-62)
214312) is disposed at the distal ends of a pair of measurement levers L1 and L2 urged in a direction away from each other with a tension spring B interposed in a measurement head H supported by a floating unit F as shown in FIG. Measurement ball K1, K2
Is inserted into a ball groove G formed on the inner peripheral wall of the workpiece W, and the dimension between the ball grooves is measured.

A conventional floating device (Japanese Utility Model Laid-Open No. 5-8)
7502), the fixed portion T and the measuring head H are connected by a plurality of support rods S each having a small-diameter constricted portion N formed at each end as shown in FIG. The measurement head H was floating.

[0004]

The above-mentioned conventional ball groove measuring device is characterized in that the measuring ball K1 disposed at the distal ends of the pair of measuring levers L1 and L2 urged in the direction of separation in the measuring head H. , K2 are inserted into the ball grooves G formed on the inner peripheral wall of the object to be measured to measure the distance between the ball grooves. Therefore, the axis of the measuring head H and the axis of the object to be measured are measured. When the axes are not coincident or inclined, an excessive force is applied to the measuring head H itself, and a lateral force acts on the measuring levers L1 and L2, so that the measuring lever L
1. There was a problem that the opening and closing of L2 did not work well and it was not possible to accurately measure the distance between ball grooves.

In the above-mentioned conventional floating device, the fixed portion T and the measuring head H are connected by the plurality of support rods having the small-diameter constricted portions at both ends, and the axis O
The measurement head H is floated in the vertical direction with respect to the above, however, there is a problem that depending on how the object to be measured is placed, a lateral force acts on the measurement feeler and accurate measurement cannot be performed.

The present inventors dispose a plurality of guides at the tip of a head main body supported by a floating unit, position the object to be measured by contacting and supporting the object, and perform measurement. Focusing on the technical idea of the present invention of measuring the size of the object to be measured positioned by the feeler, as a result of further research and development, it is possible to prevent an extra force from acting on the measurement feeler, and to improve accuracy. The present invention has attained the object of achieving the objective of enabling good measurement and reducing the number of parts to achieve a simple configuration to reduce costs.

[0007]

A measuring head according to the present invention (a first invention according to claim 1) has a head body supported by a floating unit, a head body provided at a tip of the head body, and an object to be measured. A plurality of guides that position the object to be measured by contacting and supporting the object, and a measurement feeler that is provided at the tip of the head body and abuts on the object to measure its dimension. is there.

According to a second aspect of the present invention, in the first aspect, the measuring head includes an opening and closing mechanism for opening and closing the measurement feeler, and the plurality of guides move the opening and closing mechanism. The position of the object to be measured is determined by opening and closing the object to be measured.

In the measuring head according to the present invention (the third invention according to the third aspect), in the second invention, after the guide positions the object to be measured, the measuring head follows the movement of the opening and closing mechanism. When the feeler opens and closes, it comes into contact with the object to be measured positioned by the plurality of guides, and measures its dimension.

[0010]

In the measuring head according to the first aspect of the present invention, the object to be measured is positioned by the plurality of guides disposed at the tip of the head body.
Since the dimensions of the object to be measured positioned by the measurement feeler are measured, an extra force is prevented from acting on the measurement feeler, and accurate measurement is enabled.
By reducing the number of parts and adopting a simple configuration, it is possible to reduce the cost.

In the measuring head according to a second aspect of the present invention, in the first aspect, the plurality of guides open and close following movement of the opening and closing mechanism for opening and closing the measuring feeler. Since the object is positioned, it is possible to position the object to be measured following the movement of the opening / closing mechanism.

In the measuring head according to a third aspect of the present invention, the object to be measured is positioned by the plurality of guides in accordance with the movement of the opening and closing mechanism, and the measuring feeler is opened and closed. By doing so, the dimension of the measured object is measured by contacting the measured object, so that an extra force is prevented from acting on the measurement feeler, and an effect of enabling accurate measurement is achieved.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention are described below.
This will be described with reference to the drawings.

(Embodiment) The measuring head of this embodiment is
As shown in FIGS. 1 to 6, a head main body 1 supported by a floating unit 2 and an opening / closing mechanism 3 arranged in the head main body 1 for opening and closing a measuring head.
And the opening / closing mechanism 3 disposed at the tip of the head body 1.
6 by opening and closing following the movement of the object 6, the object 6 comes into contact with the inside of the object 6 and is supported at four points (FIG. 6).
And the plurality of guides 4 for positioning the object 6 to be measured, and the plurality of guides 4 arranged at the tip of the head body 1 to open and close following the movement of the opening and closing mechanism 3. The measured object 6
And a measurement feeler 5 which comes into contact with the inside of the inside and measures the size of its inside diameter.

As shown in FIGS. 1 to 5, the floating unit 2 has one end member 21 attached to a base 100.
The other end member 22 is fixed to an opening / closing cylinder portion 30 described later connected to the head main body 1, and a pressing spring 24 is provided between the intermediate member 23 and the one end member 21 locked to the other end member. Is inserted, and a bearing 25 is inserted between the intermediate member 23 and the case locked by the one end member 21 to support the head main body 1 rotatably and swingably.

As shown in FIGS. 1 to 5, the opening / closing mechanism 3 has two air supply ports 302 and 303 formed in an outer peripheral wall of a cylinder 300 having one end fixed to the floating unit 2 and has a piston formed by air. 30
An opening / closing cylinder portion 30 in which the piston 1 reciprocates; a first shaft 31 having one end locked to the piston 301 and coaxially inserted into the head main body 1; A second shaft 32 interposed so as to be able to move forward and backward, and a T-shaped section opening / closing ring 33 supported coaxially and forward and backward to the second shaft 32
A taper block 34 having a truncated cone shape provided at the tip of the second shaft 32; and a spring 35 inserted between the feeler opening / closing ring 33 and the taper block 34.
Consisting of

The head body 1 is constituted by a double cylinder member comprising an inner cylinder 11 in which the first shaft 31 is coaxially inserted and an outer cylinder 12 constituting an outer peripheral wall, and one end of which is an opening / closing cylinder. It is fixed to the part 30.

As shown in FIG. 6, the plurality of guides 4 are arranged such that four guides 4 are opposed to the tip of the head main body 1.

As shown in FIGS. 1 to 5, each guide 4 includes a first vertical portion 41, a horizontal portion 42, and a second vertical portion 4.
3 and a substantially crank-shaped member,
The other end of the first protrusion 44 provided to be orthogonal to the end of the first vertical portion 41 and the outer cylinder 12 of the head main body 1
The guide return spring 45 is interposed between the first vertical portion 41 and the guide return spring 45 to urge the guide inward in the radial direction, and the other end of the second projecting portion 46 provided to be orthogonal to the center of the first vertical portion 41. The inclined surface is in contact with the inclined outer peripheral wall of the tapered block 34.

The measurement feeler 5 is fixed to the tip of a lever 51 swingably supported in the head main body 1 as shown in FIGS. 1 to 5, and as shown in FIG. 1 is a contactor-integrated feeler in which a hemispherical contact portion 59 is formed to protrude in opposition to the tip of the contact member 1.

The lever 51 is swingably supported by a bracket 52 disposed in the head main body 1, and has a hole at one end into which a pin 53 protruding from the inner cylinder 11 of the head main body 1 is inserted. A portion 54 is formed and the pin 5
The lever 51 is urged radially inward by a contact pressure spring 55 inserted between one end of the lever 3 and one end of the lever 51.

A core shaft 56 projects from the center of the lever 51 and is inserted into the differential transformer 7 as a detector. The other end of the lever 51 is engaged with the feeler opening / closing ring 33. A substantially L-shaped projection 57 is provided to protrude.

As shown in FIG. 5, the measuring head of the present embodiment having the above-described configuration is operated by a base 100 by an operator.
A workpiece, which is the workpiece 6, is set on a workpiece receiver 104 provided in a hole of a plate 103 supported by support portions 101 and 102 erected on the workpiece. At this time, the guide 4 and the measurement feeler 5 are closed as shown in FIG.

When air is supplied to the air supply port 302, the piston 301 rises as shown in FIG. 2, and the first shaft 31 and the second shaft locked by the piston 301 32 rises. At this time, since the second shaft 32 is urged upward by the spring 35, the tapered block 34 disposed at the tip of the second shaft 32 also moves upward with the rise of the piston 301, The inclined outer peripheral wall of the tapered block 34 comes into contact with the inclined surface at the other end of the second protruding portion 46 that protrudes horizontally at the center of the first vertical portion 41, and the guide 4 is returned to the guide return. The guide 4 is moved rightward in the figure against the urging force of the spring 45 so that the outer wall of the second vertical portion 43 of the guide 4 contacts four locations (shown in FIG. 6) of the inner peripheral wall of the DUT 6. The object 6 is supported in contact with the object 6
The center of the hole is aligned with the center of the measuring head.

When air is further supplied to the air supply port 302, as shown in FIG.
1 rises and the first shaft 31 locked by the piston 301 rises, but the second vertical portion 4 of the guide 4
3 is in contact with the inner peripheral wall of the DUT 6 and the second
Block 34 disposed at the tip of the shaft 32
The inclined outer peripheral wall of the second shaft 32 is in contact with the inclined surface of the second projecting portion 46, so that the second shaft 32 does not rise.

When air is further supplied to the air supply port 302, as shown in FIG.
1 rises, and the first shaft 31 locked by the piston 301 further rises, so that the tip of the first shaft 31 contacts the lower end of the feeler opening / closing ring 33 to open and close the feeler. In order to move the operating ring 33 upward, the engagement relationship between the substantially L-shaped projection 57 protruding from the other end of the lever 51 and the feeler opening / closing ring 33 is released, and the lever 51 and the measurement The feeler 5 swings counterclockwise due to the urging force of the contact pressure spring 55, and the hemispherical contact portion formed at the tip of the measurement feeler 5 is positioned on the inner peripheral wall of the object 6. 6 (shown in FIG. 6), the amount of insertion of the core shaft 56 projecting from the center of the lever 51 into the differential transformer at this time is detected, and the lever 51 swings. The corner, The inner diameter of Jobutsu 6 is measured.

When the measurement of the inner diameter of the object 6 is completed,
Since the air is supplied to the air supply port 303 and the piston 301 descends, the measuring feeler 5 is closed first and the inner surface of the object 6 is separated from the state shown in FIG. Subsequently, the guide 4 is closed and the guide 4 is separated from the inner peripheral wall of the DUT 6 and finally returns to the state shown in FIG.

In the measuring head according to the present embodiment having the above operation, the object 6 is positioned by the plurality of guides 4 disposed at the tip of the head main body 1, and is positioned by the measuring feeler 5 ( Since the dimension of the object 6 to be measured (centered) is measured, it is possible to prevent an extra force from acting on the measurement feeler as in the above-described conventional apparatus, thereby enabling accurate inner diameter measurement. To play.

The measuring head of this embodiment follows the movement of the opening / closing mechanism 3 comprising one air cylinder,
The measurement object 6 is positioned by the plurality of guides 4, and further, the measurement feeler 5 is opened and closed to abut on the measurement object 6 positioned to measure its dimensions, so that accurate measurement is possible. And 2
By reducing the number of parts, simplifying the control, and adopting a simple configuration as compared with the case of using individual air cylinders, there is an effect that the cost can be reduced.

Further, the measuring head of the present embodiment realizes two opening and closing operations by swinging the plurality of guides 4 and the measuring feeler 5 in conjunction with one linear reciprocating operation of one air cylinder. Therefore, there is an effect that the opening / closing operation 2 can be reliably performed and the operation can be performed at a constant operation timing.

The above-described embodiments are exemplifications for explanation, and the present invention is not limited to these embodiments. Those skilled in the art will recognize from the claims, the detailed description of the invention, and the drawings. Modifications and additions are possible without departing from the technical idea of the present invention.

In the above-described embodiment, an example of measuring the inner diameter of the object to be measured has been described as an example. However, the present invention is not limited to this, and a mode of measuring the outer diameter of the object to be measured is adopted. It is something that can be done.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a closed state of a guide and a measurement feeler in a measurement head according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state in which a guide is opened by raising first and second shafts in the measuring head of the present embodiment.

FIG. 3 is a cross-sectional view showing a state in which the first shaft is raised and the first shaft is in contact with a feeler opening / closing ring in the measuring head of the embodiment.

FIG. 4 is a cross-sectional view showing a state in which the first shaft pushes up a feeler opening / closing ring as the first shaft rises and the measurement feeler is opened in the measurement head of the present embodiment.

FIG. 5 is an overall view showing a relationship between a work mounting table and a measuring head in the embodiment.

FIG. 6 is a plan view showing an arrangement relationship between a guide and a measurement feeler in the measurement head of the embodiment.

FIG. 7 is a cross-sectional view showing an entire conventional ball groove measuring device.

FIG. 8 is a sectional view showing a conventional floating device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Head main body 2 Floating unit 3 Opening / closing mechanism 4 Guide 5 Measurement feeler 6 DUT

Claims (3)

[Claims] 1. A head body supported by a floating unit, a plurality of guides disposed at a tip of the head body, the guides positioning the object by abutting and supporting the object. A measuring head, which is provided at a tip of a main body, and which is in contact with the object to be measured and measures its dimension. 2. The apparatus according to claim 1, further comprising an opening / closing mechanism for opening and closing the measurement feeler, wherein the plurality of guides open and close following the movement of the opening / closing mechanism, thereby positioning the object to be measured. A measuring head characterized in that: 3. The object positioned by the plurality of guides according to claim 2, wherein after the guide positions the object to be measured, the measurement feeler opens and closes following the movement of the opening and closing mechanism. A measuring head configured to measure a dimension of the measuring head in contact with the measuring object.