JP3438119B2 - Center runout measuring device for shaft workpiece - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a center runout measuring device for a shaft work such as a crankshaft, and more particularly, to rotating a shaft work placed on a V block around an axis to measure a measured part relative to a reference part. The present invention relates to a shaft runout measuring device for a shaft work that measures a core runout amount.

[0002]

2. Description of the Related Art There is known a center deviation measuring device for placing a work on a V block or the like, centering it, and rotating it to measure a center deviation of a predetermined part with respect to a reference part. Figure 7
Is a center runout measuring device for a crankshaft used in a four-cylinder automobile engine. Reference numerals 2 and 2 are two V blocks arranged at a predetermined interval, and the crankshaft W (hereinafter, referred to as a work W) that is a work is the first V block.
The journal unit W ₁ and the fourth journal unit W ₄ are placed on the V block 2. With this, the work W is automatically
Is centered. Reference numeral 8 is a well-known dial gauge, which includes a support column 18 that is slidably erected by a base 18a on a base 1 that is a surface plate, and a set screw 19 on the support column 18.
It is held by the support means of the dial gauge 8 including an arm 19 which is vertically adjustable by a. The dial gauge 8 is attached to the tip of the arm 19 via an attaching means 19b so that the angle can be adjusted.

The center runout of the work W is measured by the following procedure. That is, first, the work W is placed on the V block 2. Next, the supporting means is slid on the base 1 to be positioned near the work W. Then, the second journal portion W ₂ and the third journal portion W that are the measured parts
Hole Wa formed in the outer peripheral surface of ₃ and the one end surface of the work W
The detector 8a of the dial gauge 8 is brought into contact with the inner peripheral surface of the. Thereafter, for each dial gauge 8, the pointer (not shown) of the dial gauge 8 is made to point to the origin (0) while finely adjusting the position of the supporting means, the height of the arm 19, and the mounting angle of the dial gauge 8. In this state, the balance weight portion formed in the middle portion of the work W is held by hand and the work W is rotated in either direction. Work W
Is the first journal section W ₁ and the fourth journal section W ₄
Will be rotated based on. The second journal portion W _2, when there is a deflection center to a third journal portion W ₃ and the hole Wa, since the pointer of the dial gauge 8 is swung, by recording the shake amount, the second journal portions W _2,
It is possible to know how much the third journal portion W ₃ and the hole Wa deviate from the first journal portion W ₁ and the fourth journal portion W ₄ .

However, the above-mentioned conventional measuring device has the following problems. Each time the workpiece is replaced, the dial gauge must be moved together with the support means to reset the measuring means. Further, since the part where the dial gauge detector contacts differs depending on the work, it is necessary to frequently reset the dial gauge origin. Since the support means that supports the dial gauge is freely movable on the base, the position of the measuring device will shift only when a part of the operator's body comes into contact with the support means, and the measurement device must be reset and repeated for measurement. I have to. Since the detector of the dial gauge contacts the measured part from the upper side of the work, the detector is located near the operator's hand, and the operator's hand accidentally touches the detector during the measurement work. If this happens, accurate center runout measurement will not be possible, and the measurement must be redone. When the measured portion is tapered, even if the work moves slightly in the axial direction, accurate center runout measurement becomes impossible, so the work must be rotated so as not to be displaced. Therefore, there is a problem that it takes a lot of time from the start to the end of measurement of one work, the work efficiency is poor, and the work load on the worker is heavy.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and in measuring the center runout of a work, even when performing the center runout measurement of a large number of works, the measuring device can be reset. To provide a measuring device that is unnecessary and has a low risk of interference between the measuring device and the operator's body and that facilitates measurement work. It is an object of the present invention to provide a measuring device capable of measuring a portion and capable of performing accurate core runout measurement even when the portion to be measured is formed in a tapered shape.

[0006]

In order to achieve the above object, a work center runout measuring apparatus of the present invention rotates a shaft work around an axis to measure a runout amount of a measured part with respect to a reference part. In a shaft deflection measuring device for measuring a shaft work, a mounting member for mounting and centering the shaft work in the vicinity of the reference portion, and swinging around an axis orthogonal to the axis of the shaft work. A first swingable member, a second swingable member provided on the first swingable member and swingable about the axis parallel to the axis of the reference arm, and provided on the second swingable member. A reference arm capable of abutting against the reference portion by the rocking motion of the first rocking member and the second rocking member, and a first arm for constantly biasing the reference arm in a direction of abutting the shaft work. The urging means and the second swing member are swingably provided. A detection arm that abuts on the measured portion and swings in accordance with the amount of center deviation with respect to the reference portion; a second urging means that constantly urges the detection arm in a direction to abut the shaft work; 2 measuring means provided on the rocking member for detecting the rocking amount of the detection arm.

The measuring device is provided with work positioning means for rotatably supporting the shaft work and for positioning the work at a predetermined position by restricting the shaft work from moving in the axial direction during rotation. Good.
Further, the concrete construction of the work positioning means includes a rotatable first pressing roller that abuts on one end face of the shaft work at a position eccentric from the axis of the shaft work, and on the same axis as the first pressing roller. And a second pressing roller that comes into contact with the other end surface of the shaft work, and the second pressing roller are mounted so as to be movable back and forth, and are attached in a direction in which the shaft work is pressed against the first pressing roller via the second pressing roller. A rotatable lever with a biasing means for biasing,
The shaft work may include a stopper that restricts the rotation of the lever while being sandwiched by the first pressing roller and the second pressing roller.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described with reference to the drawings. In the following description, "front" means the left side in FIG. 1, "rear" means the same right side, "one" means the same upper side, and "other" means the same lower side. To do. 1 is a plan view of a center runout measuring unit according to an explanatory view of a work center runout measuring apparatus of the present invention, FIG. 2 is a partially cutaway view in the X direction of FIG. 1, and FIGS. 1 is an explanatory view of a main portion of a center runout measurement unit, showing a view of an arm and a detection arm in the Y direction in FIG. 1, FIG. 5 is a plan view illustrating the configuration of a work positioning unit, and FIG. It is a figure. On the base 1, V blocks 2 and 2 serving as mounting members for mounting and centering a shaft work (hereinafter, referred to as a work) W are attached to face each other. The work W is placed by being centered by the V-shaped grooves 2a, 2a of the V blocks 2, 2.

[Description of First Swing Member] V Blocks 2 and 2
A support body 4 is attached to the base 1 at a position on the other side where it does not interfere with the work W therebetween. On this support body 4, the axis C of the work W centered and placed on the V blocks 2 and 2 is mounted.
A shaft 5 is supported in a direction orthogonal to the shaft 5, and a first swing member 3 is attached to the shaft 5. The first swinging member 3 is arranged so that its longitudinal direction is parallel to the axis C, and is swingably attached to the shaft 5 by a shaft support portion 3c that is provided in a convex shape at the center of the lower surface.

[Explanation of Second Swing Member] On the upper surface of the first swing member 3, shaft support portions 3a, 3a are provided in front and rear projections at appropriate intervals, and the shaft support portions 3a, 3a are inserted therethrough. Is supported so that the shaft 7 is parallel to the axis C. A second swing member 9 is attached to the shaft 7 so that the longitudinal direction thereof is parallel to the axis C. That is, on the other side surface of the second swinging member 9, the shaft supporting portion 7 is provided at a narrower interval than the shaft supporting portions 3a and 3a.
a and 7a are projected forward and backward, and the shaft 7 has the shaft supporting portions 7a and 7a.
Insert a. Grooves 7b and 7b are formed in the circumferential direction at portions of the shaft 7 that are inserted through the shaft support portions 7a and 7a.
Plunger balls 7 provided on the shaft support portions 7a, 7a
b and 7b engage with the grooves 7c and 7c to restrict the movement of the second swinging member 9 in the axial direction. Of course, the balls 7b, 7b
The friction between the groove 7c and the grooves 7c and 7c is sufficiently small and does not hinder the second swinging member 9 from swinging around the shaft 7.

[Description of Reference Arm] At both front and rear ends of one side surface of the second swing member 9, reference arms 10 and ₄ are provided at equal intervals to the first journal portion W ₁ and the fourth journal portion W ₄ , which are reference portions. 10 is attached. Reference arm 1
0 and 10 extend from the second swinging member 9 toward the work W side, and the tip abutting portions 10a and 10a are V blocks 2 and 2, respectively.
It comes into contact with the outer peripheral surfaces of the first journal portion W ₁ and the fourth journal portion W _{4 in} the vicinity of.

[Structure of First Energizing Means] Reference Arm 10,
The first urging means for constantly urging the reference arm 10 in the direction of abutting the workpiece W on the reference arm 10, 10 is a single urging means.
May be directly urged, but in this embodiment, the compression coil springs 6, 6 that urge the first swing member 3 are urged.
(Hereinafter referred to as springs 6 and 6) and a compression coil spring (hereinafter referred to as spring) 11 and 11 provided between the first swinging member 3 and the reference arms 10 and 10 so as to urge it. I have to. That is, the front and rear ends of the first swinging member 3 are
Springs 6, 6 provided between the first swinging member 3 and the base 1.
6 always urges upward. This spring 6,6
Fit both ends to the pin bodies 6b, 6b attached to the lower surface sides of both ends of the first swinging member 3 and the pin bodies 6a, 6a attached to the base 1 so as to face the pin bodies 6b, 6b. It is worn and supported. In addition, the reference arms 10, 10
A spring 1 as a biasing means is provided between the first swing member 3 and the first swing member 3.
1, 11 are interposed, and the second swinging member 9 is always urged upward via the reference arms 10, 10. The springs 11, 11 are holes 1 formed in the reference arms 10, 10.
0b and 10b are fitted at their upper ends, and the lower ends are engaged with brackets 3b and 3b extending from both ends of the first swinging member 3 downwardly of the reference arms 10 and 10.

On the other hand, one of the V blocks 2 and 2
Or on both sides (both in this embodiment) on the other side
12 is attached, and the reference arm 10 is the stopper 1
By contacting the spring 2, the springs 6, 6 and the spring 11
Necessity of the first rocking member 3 and the second rocking member 9 due to the biasing force.
Rotation is restricted more than necessary. As mentioned above, the first swing
The moving member 3 and the second swinging member 9 include the orthogonal shaft 5 and
Since it can swing around the shaft 7,
Reference part W₁, W_FourEven if the outer diameter size and shape of the
The reference arms 10 and 10 include the tip abutting portions 10a and 10a.
The first journal part W, which is the reference part respectively₁And the fourth
Journal Department W _FourCan be reliably brought into contact with.

[Explanation of Detecting Arm] Further, the second swinging member 9 is provided at a position corresponding to the second journal portion W ₂ and the third journal portion W ₃ , which are the measured portions, at a substantially right angle in the central portion. Bending L-shaped detection arms 13 and 13 are attached. The detection arms 13 and 13 are swingably supported by a shaft 14 provided on the second swing member 9 so that the detection arms 13 and 13 are parallel to the axis C at the bent portions. The one end of the detection arm 13, 13 extending workpiece W side, the first contact portion 13a which contacts the outer peripheral surface and the point of the second journal portion W ₂ and the third journal section W _3, 13a are formed, the Second contact portions 13b, 13b that come into contact with the detectors 8a, 8a of the dial gauges 8, 8 that are measuring means are formed on the other end side that extends upward along the two swinging members 9.

[Explanation of Measuring Means] The second swinging member 9 includes:
Standing parts 9a, 9a along the detection arms 13, 13
Is formed, and a mounting portion for mounting the dial gauges 8, 8 serving as measuring means is formed on the upper ends of the standing portions 9a, 9a. In this embodiment, the mounting portion is
These are through holes 9b, 9b into which guide portions 8b, 8b for movably guiding the detectors 8a, 8a of the dial gauges 8, 8 are inserted, and the guide portions 8b, 8b are clamped and held inside the holes. The through holes 9b and 9b are formed so as to penetrate from one side surface to the other side surface of the second swinging members 9 and 9, and the internally fitted tightening sleeve 17 is pressed in the diameter reducing direction by a bolt or the like. It holds the dial gauges 8, 8. Then, the detectors 8a, 8a protruding from the through holes 9b, 9b to one side surface of the second swing member 9 are the detection arms 13, 1 respectively.
3 is always in contact with the second contact portion 13b. Therefore, when the detection arms 13 and 13 swing about the shafts 14 and 14, the swing amount at the second contact portions 13b and 13b is displayed as a swing of the pointers of the dial gauges 8 and 8. Axis 1
4 to the first contact portion 13a and the shaft 14 to the second
When the distance to the contact portion 13b is the same, the deflection of the pointer is the amount of movement of the first contact portions 13a, 13a, that is, the second journal portion W ₂ and the third journal portion W that are the measured portions.
The first journal part W, which is the reference part of the journal part W _{3.
It is} nothing but the amount of center runout with respect to ₁ and the fourth journal portion W ₄ . The measuring means is not limited to the dial gauge 8 as long as it can detect the swing amount of the detection arm 13, and other measuring means may be used. Further, when it is only necessary to determine whether or not the detection arm 13 swings beyond the allowable range, a proximity switch or the like may be used.

Further, the standing portion 9a of the second swinging member 9 has
Contacting the detection arms 13 and 13, the detection arms 13 and 13
Are provided with stopper bolts 15b, 15b for restricting them from swinging to the other side more than necessary. Brackets 9c and 9c are extended along the detection arms 13 and 13 at the lower end of the standing portion 9a. This bracket 9
c and 9c are provided with stopper bolts 15a and 15a that come into contact with the detection arms 13 and 13 and restrict the detection arms 13 and 13 from swinging to one side more than necessary.

[Description of Second Biasing Means] Stopper Bolt 1
Compression coil springs 16 and 16 (hereinafter, referred to as springs 16), which are second biasing means, are fitted to 5a and 15a, and constantly bias the detection arms 13 and 13 in a direction to bring them into contact with the work W. ing. Of course, the other end side of the detection arms 13 and 13 may be pulled by a tension coil spring as long as the detection arms 13 and 13 can always be biased upward. The detection arms 13, 13 by the springs 16, 16.
In the state where the work W is not placed on the V blocks 2 and 2, the second contact portions 13b and 13b are connected to the detectors 8a and 8a.
8a is pressed, but the excessive load is not applied to the detectors 8a, 8a to damage the dial gauges 8, 8, and the pointers of the dial gauges 8, 8 are set to the origin (0) at the time of measurement. The protrusion amount of the stoppers 15b and 15b must be adjusted so that the center can swing within a measurable range.

[Construction of Work Positioning Means] Next, when the work W is rotated about the axis C, the work W is regulated so as not to move in the direction of the axis C and positioned at a predetermined position. The configuration of will be described. Support members 20a and 20b are attached to the base 1 at positions outside the front and rear of the V blocks 2 and 2 so as not to interfere with the work W. The front side support member 20a is provided with a first pressing roller 22 that comes into contact with the front end surface of the work W at a position eccentric from the axis C and rotates as the work W rotates. The support member 20b on the rear side includes a first pressing roller 22
A rotatable second pressing roller 24 is provided on the same axis as the above. Like the first pressing roller 22, the second pressing roller 24 contacts the rear end surface of the work W at a position eccentric from the axis C and is rotatable as the work W rotates.

A lever 27 is rotatably provided on the support member 20b about a shaft 28 which is orthogonal to the axis C. The lever 27 includes a lower lever 27a pivotally supported by a shaft 28 and an upper lever 27 having a grip portion 27d.
b, and the upper lever 27b is attached to the lower lever 27a via a shaft 29.
The lever 27 can be rotated in a direction orthogonal to the rotating direction. A stopper 26 that can be engaged with the upper lever 27b of the lever 27 is provided above the support member 20b. By rotating the upper lever 27b of the lever 27 about a shaft 29, the stopper 26 is engaged with the upper lever 27b.
Can be disengaged.

The second pressing roller 24 is attached to the lever 27 so as to be movable back and forth. That is, the boss portion 27c is formed on the lower lever 27a of the lever 27, and the boss portion 27c
A shaft 21 is provided so as to be able to move forward and backward through the through hole of c (front and rear direction in FIG. 5). The second pressing roller 24 is attached to the tip of the shaft 21, and the compression coil spring 25 (hereinafter,
It is constantly urged forward by a spring 25).
A stopper 21a is attached to the rear end portion of the shaft 21 protruding from the boss portion 27c, and is regulated by the urging force of the spring 25 so that the shaft 21 does not jump out from the boss portion 27c. According to this aspect, when the lever 27 is rotated to the work W side while the work W is placed on the V blocks 2 and 2, the second pressing roller 24 contacts the other side surface of the work W and the spring 25 is attached. The work W is pushed forward by the force to bring the front end surface into contact with the first pressing roller 22. When the lever 27 is rotated to the position before the stopper 26, the upper lever 27b is rotated to further rotate the lever 27 toward the work W so as not to interfere with the stopper 26, and when the lever 26 is crossed, the upper lever 27b is moved. It is returned and engaged with the stopper 26. As a result, the rotation of the lever 27 is restricted, so that the work W is pressed against both pressing rollers 22, 2.
It is sandwiched between the four and its movement in the direction of the axis C is restricted.

The work positioning means is not limited to the one having the above-mentioned structure. For example, the work W may be clamped from both ends by a tailstock-like member on the axis C, or the V groove 2a of the V block 2 may be used. An engaging protrusion is formed on the engaging protrusion, and an engaging groove that is constantly engaged with the engaging protrusion is formed on the reference portion W of the work W.
_It may be formed in the vicinity of ₁ and W ₄ . Further, in the case of a work that does not need to take into account the positional deviation in the axis C direction in the measurement of the runout, the work positioning means need not be provided.

[Operation of the Present Invention] Next, the operation of the core runout measuring apparatus of the present invention having the above-described structure will be described. First, work W is V
Place on blocks 2 and 2. In the present invention, not intended to directly abut the measured region of the detecting element 8a workpiece W dial gauge 8 (journal W _2, W _3), to measure through the detection arm 13 Therefore, the dial gauges 8 and 8 can be provided at positions distant from the work W, and the detection arms 13 and 1 can be provided.
3 is also a measured portion (journal portion W
₂ , W ₃ ), it is possible to prevent interference between the work W and the measuring device when the work W is attached to or detached from the V blocks 2 and 2.

When the work W is placed on the V block 2,
V-blocks 2 and 2 perform centering,
The first journal in which the reference arms 10 and 10 are reference parts
Department W ₁And the fourth journal section W_FourAbut. This and
The first journal section W₁, 4th Journal Division W_FourOut of
The first rocking member 3 and the second rocking member according to the diameter and shape.
9 swings, and the reference arms 10 and 10 are securely attached to the first jar.
Null part W₁And the fourth journal section W_FourSurely for both
Can be brought into contact. Original position of the detection arm 13,13
Position (measurement start position) is the tip end of the reference arm 10, 10.
First contact portions 13a, 13a for the contact portions 10a, 10a
The first journal section as determined by the position of
W₁, Second Journal Department W₂, Third Journal Department W₃Oh
And the fourth journal section W_FourHave the same outer diameter and shape
As long as the work W is changed, the dial gauges 8 and 8
There is no need to reset the origin (O). That is, each
Journal section W₁, W₂, W₃, W_FourThe outer diameter and shape of
Repeated runout meter for many identical workpieces W
When performing measurement, dial dial for the first work W
If you set the origin of page 8 and 8, you can measure the center runout later.
No other adjustment is required for other workpieces W that perform
It

Then, the lever 27 is rotated to align the work W in the direction of the axis C with the pressing rollers 22 and 24. When it is necessary to perform center runout measurement for the hole Wa formed on the end surface of the work W, the detector 8a of the dial gauge 8 is brought into contact with the inner peripheral surface of the hole Wa, and the height position of the dial gauge 8 and Finely adjust the posture and set the pointer to the origin (0). Since the supporting means for supporting the dial gauge 8 for measuring the center runout of the hole Wa is the same as that of the conventional example shown in FIG. 7, detailed description thereof will be omitted here. After that, when the work W is rotated in either direction, the detection arm 13 swings in accordance with the center runout amount of the second and third journal portions W ₂ and W ₃ , and the pointer of the dial gauge 8 swings. Therefore, the operator reads the swing amount of the pointer to read the second and third journal portions W ₂ and W _{3 with} respect to the first and fourth journal portions W ₁ and W ₄ .
You can know the amount of core runout. When the center runout amount exceeds the allowable value, the work W is corrected in another process. After the measurement work is completed, the engagement between the lever 27 and the stopper 26 is released, the lever 27 is rotated in the opposite direction, and the clamping of the work W by both pressing rollers 22, 24 is released. Thereby, the work W can be exchanged.

Although the preferred embodiment of the present invention has been described, the present invention is not limited to the above embodiment. For example, in the above-described embodiment, the workpiece for the four-cylinder engine having two measured portions has been described as a shaft workpiece, but the detection arm 13 and the dial gauge 8 are increased in number depending on the number of measured portions, so that four workpieces are provided. It can also be applied to a crankshaft for a 6-cylinder engine having a measured part. Further, in the above embodiment, the standing portions 9a, 9a, the dial gauges 8, 8, the detection arm 1 are provided.
3, 13 and the reference arms 10, 10 to the second swinging member 9
Along the axis C so that it can be moved in the front-rear direction parallel to the axis C and can be positioned and fixed at any position, so that the positions of the reference parts W ₁ , W ₄ , and the measured parts W ₂ , W ₃ are different. It becomes possible to perform center runout measurement of a shaft work with a single measuring device.

[0026]

Since the present invention is constructed as described above, it has the following effects. Since the origin of measuring means such as dial gauge is set automatically just by placing the shaft work on the V block,
The work time for measuring the runout can be significantly reduced, and the work load on the worker can be reduced. Since the measuring device is configured so as not to interfere with the shaft work or a part of the worker's body during the measurement, accurate measurement can be performed, and highly reliable measurement results can be obtained. In the case where the work positioning means is provided, the shaft work is clamped from both sides to perform positioning in the axial direction and the movement is restricted, so that the same shaft work can always be measured at the same position. Becomes,
It becomes possible to perform accurate measurement without variation, and it becomes possible to perform accurate and quick measurement even when the measurement target portion is tapered. As described above, according to the present invention, it is possible to greatly reduce the center runout measurement time of one shaft work, and it is also possible to reduce the work load on the worker.

[Brief description of drawings]

FIG. 1 is a plan view of a core runout measuring unit according to an explanatory view of a core runout measuring device for a shaft work according to the present invention.

FIG. 2 is a partially cutaway view in the X direction of FIG.

FIG. 3 is an explanatory view of a main part of a center runout measurement unit, and is a view of the reference arm as viewed in the Y direction in FIG.

FIG. 4 is an explanatory view of a main part of a center runout measurement unit, and is a view of the detection arm in the Y direction in FIG.

FIG. 5 is a plan view illustrating a configuration of a work positioning unit according to an explanatory view of a core wobbling measuring device for a shaft work of the present invention.

6 is an explanatory view of the work positioning means, and is a Z direction arrow view in FIG. 5. FIG.

FIG. 7 is an overall plan view of a conventional example of a center runout measuring device for a shaft work.

[Explanation of symbols]

C axis W W axis work W ₁ , W ₄ Journal part (reference part) W ₂ , W ₃ Journal part (measured part) 1 Base 2 V block 2a V groove 3 First swing member 3a Shaft support part 3b Bracket 4 Support 5 shaft 6 springs 6a, 6b pin body 7 shaft 7a shaft support 8 dial gauge (measuring means) 8a detector 9 second swinging member 9a standing portion 9b through hole 9c bracket 10 reference arm 10a tip contact portion 10b hole 11 Spring 12 Stopper 13 Detection arm 13a First contact portion 13b Second contact portion 14 Shafts 15a, 15b Stopper bolt (stopper) 16 Spring (second biasing means) 18 Strut 18a Base 19 Arm 19a Set screw 19b Mounting portion 20 Means 20a, 20b Support member 21 Shaft 22 First pressing roller 24 Second pressing roller 25 Spring 26 Stopper 27 Lever 27a Lower rail Chromatography 27b upper lever 27c boss portion 27d gripping portions 28 and 29 the shaft

Claims (3)

(57) [Claims] 1. A shaft work (W) is rotated around an axis (C) to measure a center runout amount of a measured portion (W ₂ , W ₃ ) with respect to a reference portion (W ₁ , W ₄ ). In the runout measuring device for a shaft work, in the vicinity of the reference part (W ₁ , W ₄ ), the shaft work (W)
A mounting member (2) for mounting and centering a shaft, and an axis (5) orthogonal to the axis (C) of the shaft work.
And a first swinging member (3) swingable about the first swinging member, wherein the reference arm is swingable about an axis (7) parallel to the axis (C). Two swinging members (9), and a reference arm (10) provided on the second swinging member and capable of contacting with the reference portion by the swinging motion of the first swinging member and the second swinging member. The first urging means (6, 11) for constantly urging the reference arm in the direction of abutting against the shaft work, and the second oscillating member oscillatably provided so that the measured portion (W ₂ , W ₃ ) and swings in accordance with the amount of center runout with respect to the reference portion, and second biasing means for constantly biasing the sensing arm in the direction of abutting the shaft work. (16) and a measuring means (8) provided on the second swing member for detecting the swing amount of the detection arm, A runout measuring device for a shaft work, which is characterized in that 2. The shaft runout measuring device for a shaft work according to claim 1, wherein the shaft work is rotatably supported and is regulated so as not to move in the axial direction during rotation. A shaft runout measuring device for a shaft work, comprising: a work positioning means for positioning at a position. 3. The work positioning means according to claim 2, wherein the rotatable first pressing roller (22) is in contact with one end surface of the shaft work at a position eccentric from the axis of the shaft work, and A second pressing roller (24) that comes into contact with the other end surface of the shaft work on the same axis as the first pressing roller
And the second pressing roller is attached so as to be able to move back and forth, and is provided with an urging means (25) for urging the shaft work in a direction to press it against the first pressing roller via the second pressing roller. A lever (27) and a stopper (2) for restricting the rotation of the lever in a state where the shaft work is sandwiched between a first pressing roller and a second pressing roller.
6) and a center runout measuring device for a shaft work.