JP2002214061A - Specimen fixing device for balancing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a specimen fixing device which is used for attaching a specimen to a balancing machine using a disk, such as the CD, DVD, etc., as the specimen, makes highly accurate measurement possible independent of the internal diameter tolerance of the disk, and suppresses the influence of the deformation, etc., on the disk to the minimum. SOLUTION: This specimen fixing device which is used for fixing the specimen 8 to the balancing machine is provided with a mobile shaft 3 which moves upward and downward while the shaft 3 is passed through the hole section of the specimen 8, a main body section 2 fixed to a rotary shaft, and a supporting section 7 which supports the specimen 8. This device is also provided with a mobile member 5 which moves upward and downward based on the movement of the mobile shaft 3, and a collet 6 having a slot 62. The mobile member 5 and collet 6 respectively have tapered sections which are slidably engaged with each other. When the mobile member 5 moves, the tapered section 61 of the collet 6 is expanded and the collet 6 fixes the specimen 8 by pressing the side face section of the hole section of the specimen 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing device for mounting a test body in a balance tester for rotating a test body at a high speed and testing its balance state. The present invention relates to a fixing device suitable for a resin disk.

[0002]

2. Description of the Related Art Conventionally, a balancing tester has been known as a device for testing a balanced state of a component (for example, a fan or a flywheel) used at a high speed rotation at a high speed rotation.

[0003] As a method of fixing a test piece in such a balancing tester, for example, in the case of a disk-shaped test piece having a hole in the center, a screw shaft having an outer diameter engaged with the inner diameter of the hole of the test piece is used. A method of fitting and fixing (fixed spigot type) is known.

FIG. 4 is a view for explaining a conventional fixing spigot type fixing device. The fixing device 100 includes an apparatus main body 101 and a reference spigot 103 for fixing a disk 102 as a test object. , Reference spigot 103
A detachable pressing metal fitting 104 that presses the disk 102 by fitting into the screw shaft 105, a screw shaft 105 for fixing the pressing metal fitting 104 to the reference spigot 103, and a knob 106 provided on the screw shaft 105 are provided. The disk 102 is inserted from above with the pressing metal fitting 104 removed, and the pressing metal fitting 1 is inserted.
04 is pressed from above and fixed.

[0005]

However, it is not easy to produce the same inner diameter of the hole of the disk in a disk such as a CD or a DVD which is premised on mass production. There are tolerances.
Due to the inner diameter tolerance, in the fixed spigot type fixing device 100, a gap may be generated between the disk 102 and the reference spigot 103, which causes the following problem.

That is, when the above-described gap occurs,
Since the center of rotation of the disk 102 is not constant, a measurement error occurs during rotation, and there is a problem that the reproducibility of the measured value deteriorates.

[0007] When a disc such as a CD or DVD is used as a test piece, these discs are made of resin and have a small thickness.
Furthermore, since it is lightweight and has low rigidity, it is easily deformed and scratched. Therefore, there is a gap between the disc 102 and the reference spigot 103, and if the disc 102 starts rotating without being securely fixed to the reference spigot 103, the disc 102 may be deformed or damaged.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. In a balancing tester using a disk such as a CD or a DVD as a test body, highly accurate measurement can be performed without being influenced by the inner diameter tolerance of the disk. It is an object of the present invention to provide a fixing device for mounting a test body, which makes it possible to minimize the influence of deformation of a disk and the like.

[0009]

Means for Solving the Problems In order to solve the above problems, the invention of claim 1 is, for example, as shown in FIGS.
A fixing device for fixing a test piece to the rotary shaft in a balancing tester for rotating a test piece (disk 8) having a penetrated hole by rotation of a rotary shaft and testing a balance state of the test piece. A moving shaft (screw shaft 3) that penetrates through the hole of the test body and moves vertically.
A main body (device main body 2) to which the moving shaft is attached and fixed to the rotating shaft;
A supporting portion (a receiving table 7) for supporting the test body, a moving member (taper cone 5) that moves in the vertical direction based on the movement of the moving shaft, a side portion of the hole, and a side portion of the moving member And a collet 6 interposed between the collet 6 and the slot 62. The moving member and the collet
Male and female tapered portions slidable by engaging with each other, and the collet taper portion (diameter enlarged portion 61) is expanded by the movement of the moving member, so that the side surface portion of the hole is formed by the collet. Is configured to press to fix the test body.

According to the first aspect of the invention, when the test body is supported by the support, the moving shaft attached to the main body is first moved downward, and the moving member is moved with the movement of the moving shaft. Also moves downward, so that the tapered portion provided on the moving member pushes and widens the tapered portion of the collet to be engaged. Since the tightening effect at the time of expanding the collet presses the side surface of the hole of the test specimen,
The test body can be securely fixed. Therefore, even if a test piece having a hole has an inner diameter tolerance and a gap is generated in the hole when the test piece is supported by the support portion,
Since the specimen can be appropriately fixed in accordance with the gap and the center of rotation of the specimen can be kept constant, it is possible to prevent deformation of the specimen during rotation and to prevent measurement errors from occurring. .

According to a second aspect of the present invention, in the fixing device according to the first aspect, the moving shaft and the moving member are configured to move separately, and an elastic member provided on an upper portion of the moving member. A spring 4) and a pressing member (knob 3) for pressing the elastic member based on the movement of the moving shaft.
1), wherein the moving shaft stops at a predetermined position below, and the moving member moves by the urging force of the elastic member based on the pressing of the pressing member at that time, thereby expanding the collet. And fixing the test body.

According to the second aspect of the invention, it is needless to say that the same effect as the first aspect of the invention can be obtained. When the moving shaft is moved to a predetermined lower position, the pressing member is elastic. By pressing the member, the urging force of the elastic member generated at that time, the moving member located at the lower part of the elastic member is pushed down to expand the diameter of the collet, but at this time, the moving shaft is not integrated with the moving member, Regardless of the error of the inner diameter of the test body, the state where it is stopped at a predetermined position is always maintained, so that the height of the moving shaft can be always kept constant. Therefore, it is possible to prevent a measurement error from occurring due to a difference in the height of the moving shaft when the test body is rotated.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a balance tester according to the present invention. FIG. 1 is a longitudinal sectional view showing a chuck releasing state of a fixing device according to the present invention before fixing a disk as a test body, and FIG. 2 is a longitudinal sectional view showing a chuck clamping state after fixing a disk. FIG. FIG. 3 is a detailed view of the collet in FIGS. 1 and 2. The fixing device 1 shown in FIGS. 1 and 2 is used in a vertical balancing tester (not shown), and is fixed to a rotating shaft (shaft) (not shown) of the balancing tester by, for example, a bolt 22.

The fixing device 1 includes a device main body 2 fixed to the rotating shaft, a screw shaft 3 inserted from above the device main body 2 and movable in the vertical direction.
A knob 31 is provided above the screw shaft 3, and a spring 4 is provided below the knob 31 so as to surround the screw shaft 3. The lower part of the screw shaft 3 is
The tapered cone 5 is inserted into the tapered cone 5, and the upper part of the tapered cone 5 is attached to the lower end of the spring. The screw shaft 3 penetrates the center of the tapered cone 5 and is inserted into the shaft portion 21 of the device main body 2.

The upper part of the shaft 21 of the apparatus main body 2 is inserted into the tapered cone 5, and a disk-shaped flange 32 provided on the screw shaft 3 provides a small space for vertical movement. They are decorated. The lower outer peripheral side of the tapered cone 5 is tapered, and the inner peripheral side is also engaged with a tapered collet 6. The collet 6 is provided around a shaft 21 of the apparatus main body 2, and is fixed to the apparatus main body 2 by bolts 23. The collet 6 is formed such that the outer periphery of the enlarged diameter portion 61 is smaller than the hole diameter of the disk 8 as a test body, for example, by about 0.1 mm. As shown in FIG. 3, the collet 6 is formed of a ring equally divided by several slits 62, and the diameter of the collet 6 is increased by elastic deformation of each member of the enlarged diameter portion 61. Therefore, when the tapered cone 5 engaging with the inner peripheral side of the collet is lowered, the ring diameter increases. The outer diameter side of the enlarged diameter portion 61 of the collet 6 is in contact with the receiving base 7 supporting the disk 8. The receiving table 7 is supported by the apparatus main body 2 and provided upward. The receiving table 7 contacts the lower surface of the disk 8 to support it.

Next, the mounting operation of the disk 8 by the fixing device 1 having the above configuration will be described. First, in FIG. 1, a bolt 2
Fix at 2. Then, insert the hole of the disk 8 with the knob 3
1, the screw shaft 3, the taper cone 5, and the collet 6 are sequentially penetrated, and the disk 8 is supported on the receiving base 7.

At this time, the chuck is in the open state, and the screw shaft 3 remains upward since it is not yet tightened. Therefore, the tapered cone 5 is provided with a flange 32 provided on the screw shaft 3.
Similarly, the outer peripheral side of the tapered cone 5 and the inner peripheral side of the enlarged diameter portion 61 of the collet 6 are not in contact with each other. Accordingly, the diameter of the collet 6 provided with the slit 62 is not increased, and there is a gap of about 0.1 mm between the hole diameter of the disk 8 and the enlarged diameter portion 61 of the collet 6.

Next, as shown in FIG. 2, the following operation is performed to fix the disk 8 to the chuck clamp state. First, the knob 31 provided on the upper part of the screw shaft 3 is turned to tighten the screw shaft 3 and move it downward. As a result, the flange 32 provided on the screw shaft 3 moves downward inside the tapered cone 5 and comes into contact with the shaft 21 of the apparatus main body 2 inserted inside the tapered cone 5. At this time, since the distance between the knob 31 and the taper cone 5 is reduced, the spring 4 tries to push the taper cone 5 downward by the spring force, and the pushed taper cone 5
The tapered lower portion pushes the enlarged diameter portion 61 of the collet 6 by a wedge effect. Due to such a tightening effect of the collet 6, a hole generated in the inserted disc 8 is generated.
The disk 8 is fixed and chucked without being affected by the gap which is the inner diameter tolerance. At this time, the slot 62 provided on the collet 6 expands according to the gap to be chucked.

After the test is completed, the disk 8 is removed from the pedestal 7. In this case, the procedure for making the chuck clamp state is reversed, and the disk 8 is removed after returning to the chuck open state again. That is, since the taper cone 5 is pulled up by the upward movement of the screw shaft 3,
The contact between the tapered cone 5 and the collet 6 is released, and the enlarged diameter portion 61 of the collet 6 returns to a state in which the diameter is not increased by its own elastic force. When the chuck is opened in this manner, a gap of about 0.1 mm is generated again between the hole diameter of the disk 8 and the enlarged diameter portion 61 of the collet 6, and the disk 8 can be easily removed.

As described above, according to the fixing device 1 in the balancing tester of the present embodiment, the enlarged diameter portion 61 of the collet 6 is enlarged and deformed by the tightening of the knob 31, so that by adjusting this, Chucks corresponding to the gaps generated in the holes of the disk 8 can be provided. That is,
Since the inner diameter tolerance of the disk can be absorbed by the tightening effect of the collet 6, the disk 8 can be fixed without being affected by the gap.

In this embodiment, the lower portion of the screw shaft 3 is inserted into the tapered cone 5, and the screw shaft 3 has a flange 3
2, the movable space of the screw shaft 3 inside the tapered cone 5 is limited. Therefore, the screw shaft 3 can move only to a predetermined position,
Since the height of the screw shaft 3 can be kept constant, it is possible to prevent a measurement error from occurring due to a difference in the height of the screw shaft 3 when the disk 8 rotates.

In the above embodiment, one embodiment of the fixing device in the balance tester according to the present invention has been described. However, the present invention is not limited to the above-described embodiment, and is provided on the screw shaft 3. The flange 32 may have a shape other than a disk shape.

[0023]

According to the first aspect of the present invention, when the test body is supported by the support portion, first, the moving shaft attached to the main body is moved downward, and the moving shaft is moved with the movement of the moving shaft. Since the moving member also moves downward, the tapered portion provided on the moving member pushes and expands the tapered portion of the collet to be engaged. Since the side surface of the hole of the test specimen is pressed by the tightening effect at the time of the collet diameter expansion, the test specimen can be securely fixed. Therefore, there is an inner diameter tolerance in the test piece having a hole, and when the test piece is supported by the support portion, even when a gap occurs in the hole, the test piece is appropriately fixed according to the gap, Since the rotation center of the test body can be fixed, deformation of the test body during rotation can be prevented, and measurement errors can be prevented from occurring.

According to the second aspect of the invention, it is needless to say that the same effect as the first aspect of the invention can be obtained. When the moving shaft is moved to a predetermined lower position, the pressing member is elastic. By pressing the member, the urging force of the elastic member generated at that time, the moving member located at the lower part of the elastic member is pushed down to expand the diameter of the collet, but at this time, the moving shaft is not integrated with the moving member, Regardless of the error of the inner diameter of the test body, the state where it is stopped at a predetermined position is always maintained, so that the height of the moving shaft can be always kept constant. Therefore, it is possible to prevent a measurement error from occurring due to a difference in the height of the moving shaft when the test body is rotated.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view of a fixing device according to the present invention, showing a chuck released state before fixing a disk.

FIG. 2 is a longitudinal sectional view showing a chuck clamping state after a disk is fixed in the fixing device according to the present invention.

3 is a detailed view of a collet 6 in FIGS. 1 and 2, (a) is a plan view, and (b) is a front view.

FIG. 4 is a view for explaining a conventional fixing spigot type fixing device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 fixing device 2 device main body (main body) 3 screw shaft (moving shaft) 31 knob (pressing member) 4 spring (elastic member) 5 taper cone (moving member) 6 collet 61 enlarged diameter portion (tapered portion) 7 cradle ( Support part) 8 discs (specimen)

Claims (2)

[Claims] 1. A fixing device for fixing a test piece to the rotary shaft in a balancing tester for rotating a test piece having a penetrated hole by rotation of a rotary shaft and testing a balance state of the test piece. A moving shaft that penetrates through the hole of the test body and moves in the up-down direction; a main body unit to which the moving shaft is attached and fixed to the rotating shaft; A supporting portion that supports a body, a moving member that moves in the vertical direction based on the movement of the moving axis, a side portion of the hole portion, and a slot provided between the side portion of the moving member and the side portion of the moving member. The movable member and the collet have male and female tapered portions that are slidable by engaging with each other, and the diameter of the tapered portion of the collet is increased based on the movement of the movable member. By the side of the hole And pressed the collet locking device, characterized in that it is configured to secure the specimen. 2. The fixing device according to claim 1, wherein the moving shaft and the moving member are configured to move separately, an elastic member provided above the moving member, and a movement of the moving shaft. And a pressing member that presses the elastic member based on the moving member, wherein the moving shaft stops at a predetermined position below, and the moving member is biased by the elastic member based on the pressing of the pressing member at that time. Wherein the collet moves so as to expand the collet and fix the specimen.