JP3006811B2 - Disk dynamic balance correction device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk dynamic balance correcting device for a disk drive, and more particularly to a disk dynamic balance correcting device for automatically correcting the dynamic balance of a disk in an assembled disk device.

[0002] Generally, hard disk drives are susceptible to dust and debris, so that their assembly lines are required to be clean, that is, unmanned.

[0003] Further, in the hard disk device, the assembling process includes a process of measuring a dynamic balance of the installed hard disk and correcting the dynamic balance.

It is desirable that this step is also performed automatically, not manually.

[0005]

2. Description of the Related Art Conventionally, in the process of assembling a hard disk drive, correction of dynamic balance of a built-in hard disk is disclosed in Japanese Unexamined Patent Publication No. 3-290890.
An operator manually attaches a balance weight to a predetermined position on a hard disk based on a measurement result obtained by the dynamic balance measurement device.

[0006]

Therefore, there are the following problems.

[0007] At the time of the repair work, dust and the like are generated by the operator, which causes a defect.

The positioning of the position where the balance weight is to be applied depends on the experience and intuition of the operator, so that it is difficult to obtain accuracy and it is difficult to properly correct the dynamic balance of the hard disk.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a disk dynamic balance correcting apparatus for a disk drive in which the dynamic balance of a hard disk is automatically corrected.

[0010]

As shown in FIG. 1, a disk dynamic balance correcting device 1 comprises a dynamic balance measuring means 2.
And a balance weight attaching means 3, a balance weight attaching position determining means 4, and a control means 5.

The dynamic balance measuring means 2 has a test stand 9 on which a housing 8 in which the disk 6 is incorporated together with the hub 7 is mounted, and the housing 8 in which the disk 6 is incorporated is mounted on the test table 9. The disk 6 is rotated, the dynamic unbalance of the disk 6 is measured, and the position P ₁ of the unbalance angle θ with respect to the reference angular position P ₀ of the disk is determined.

The balance weight sticking means 3 approaches the hub 7 in the housing 8 placed on the test table 9 and sticks the balance weight at the position Q.

The balance weight sticking position locating means 4 rotates the disk 6 based on the measurement result obtained by the dynamic balance measuring means 2 to move the position P ₁ at the unbalance angle θ to the balance weight. It reaches the position Q (position in the space) where the attaching means 3 approaches.

The control means 5 sequentially operates the dynamic balance measuring means 2, the balance weight sticking position determining means 4, and the balance weight sticking means 3.

[0015]

[Action] structure in which a balance weight attachment positioning means 4, the balance weight attaching means 3 acts to paste the balance weight to the position P ₁ for correcting the dynamic balance of the disk of the hub 7.

The structure provided with the balance weight attaching means 3 acts so that the balance weight can be attached without depending on the operator.

[0017]

FIG. 2 shows a disk dynamic balance correcting device 20 according to an embodiment of the present invention.

In the drawing, parts corresponding to those shown in FIG. 1 are denoted by the same reference numerals.

Reference numeral 21 denotes a disk dynamic balance measuring device, which constitutes the disk dynamic balance measuring means 2 in FIG.

Reference numeral 22 denotes an articulated robot, which is provided at its tip with a balance weight gripping / adhering hand 23 shown in FIG.
Is composed.

The articulated robot 22 performs a predetermined operation, approaches the clamp ring 7a of the hub 7, and attaches a balance weight to the position Q where the hand 23 faces at this time.

The hand 23 has a structure in which fingers 24 and 25 are opened and closed.
No.

[0023] C ₁₀ is a standby position, C _11, C ₁₂ is the working position.

In FIG. 2, reference numeral 26 denotes a hard disk rotating mechanism,
Reference numeral 27 denotes a camera mechanism, which constitutes the balance weight attaching position locating means 4 in FIG.

As shown in FIG. 4, the hard disk rotation mechanism 26 has an arm 28 having a base portion on a pillar 29 on the test table 9.
The arm 28 is rotatable in the directions of arrows A ₁ and A ₂ by an air cylinder mechanism 31, and a drive roller mechanism 32 shown in FIG.

The drive roller mechanism 32 includes a drive roller 35 fixed to the tip of a rotating shaft 34 supported by a bearing 33 fixed to the arm 28, and a pulse motor 36 fixed to the arm 28, similarly. When the pulse motor 36 is driven, the driving roller 35 rotates via the coupling 37.

[0027] When the arm 28 is rotated in the arrow A ₂ direction, so that the driving roller 35 is shown in FIGS. 3 and 4 the hub 7
Abut on the clamp ring 7b.

[0028] When the arm 28 is rotated in the arrow A ₁ direction,
The drive roller 38 moves away from the clamp ring 7b. Normally, the arm 28 is rotated in the arrow A ₁ direction.

[0029] A ₁₀ abutting position, A ₁₁ is a spaced position.

In FIG. 2, reference numeral 38 denotes a pulse motor drive circuit.

As shown in FIG. 2, the camera mechanism 27 has a camera body 40 and an arrow B
_1, B ₂ and an air cylinder 41 which moves in the direction, more composed visual controller 42.

[0032] In FIG. 2, the camera body 40 is located at the operating position B _10, and imaging the rotation shaft end face which will be described later.

[0033] B ₁₁ is the retracted position.

The visual controller 42 includes a camera body 40
Binarization processing of the video output of
And the inclination angle α or the like (see FIG. 7).

In FIG. 2, reference numeral 45 denotes a program controller, which constitutes the control means 5 in FIG.
The automatic operation sequence control and calculation processing of the device 20 are performed.

Next, a description will be given, with reference to FIG. 6, of a hard disk dynamic imbalance correcting operation performed by the apparatus 20 having the above configuration.

First, a hard disk dynamic balance measurement 60
I do.

The drive roller 35 is located at the separated position A ₁₁ , the camera body 40 is located at the operating position B ₁₀ , and the robot 22 is located at the standby position C ₁₀ .

The housing 8 in which the hard disk 50 is installed together with the hub 7 is placed at a predetermined place on the test stand 9.

In FIG. 3, 51 is a motor, 52 is a rotating shaft, 5
3 is a bearing. A mark 55 is marked on the end face 53 of the rotating shaft 52 as shown in FIG. This mark 55 is a reference position P ₀ of the hard disk 50.

FIG. 7 shows an example of an image taken by the camera body 40 at this time.

In the figure, the area inside the dotted line is the camera field of view (measurable range).

Reference numeral 0 denotes a coordinate origin, which coincides with the center of the rotation shaft 52.

A is a barycentric coordinate, and α is a tilt angle.

The hard disk 50 is rotated by the motor 51 at, for example, 4,000 rpm.
When the rotation speed of 0 becomes 4,000 rpm, the hard disk dynamic balance measuring device 21 measures the dynamic unbalance angle position and amount of the hard disk.

Here, the dynamic balance of the hard disk 50
Is, as shown in FIG.
Reference position P₀Angle clockwise (+ direction) with respect to₁Rank
Place P ₁, And the amount of imbalance is W.

This data is stored in the program controller 4
5 is transferred.

Next, the balance weight attaching position positioning 61 is performed.

The positioning 61 is performed in the following six steps 61
Performed via the _-1 to 61 _-6.

First, it is confirmed that the hard disk 50 stops rotating due to inertia (61 _-1 ).

The stop of the rotation of the hard disk 50 indicates that the program controller 45 converges the output from the camera body 40 to the program controller 45 via the visual controller 42 within a certain range, It is confirmed from the fact that it has not changed for a while.

[0052] Next, the hard stop position measurement (61 _-2).

This is performed based on the output of the visual controller 42.

Here, the hard disk 50 is stopped at the position shown in FIG. 9 , and the angle of the balance weight attaching position Q by the robot 22 with respect to the reference angular position P ₀ is θ ₀ in the counterclockwise direction (−direction). Suppose there is.

Next, the program controller 45 performs an operation θ ₁ − (− θ ₀ ) to obtain a rotation angle θ of the hard disk 50 for positioning (61 _-3 ).

[0056] Further, to abut against the drive roller (35) (61 _-4).

[0057] In FIG. 4, the air cylinder mechanism 31 is actuated, the arm 28 is rotated in the arrow A ₂ direction, the driving roller 35 is brought into contact with the clamp ring 7a of the hub 7.

Subsequently, the pulse motor 36 is driven (6).
_1-5 ).

A signal corresponding to the angle θ is applied to a pulse motor drive circuit 38, and the number of pulses corresponding to the angle θ is applied to the pulse motor 36 from the circuit 38, and the pulse motor 36 is driven in a predetermined step. .

As a result, the hard disk 50 is rotated counterclockwise in FIG. 9 through the drive roller 36 by an angle θ, and the hard disk 50 is positioned at the unbalanced angular position P _{1 as} shown in FIG. It stops at the position of Q.

In this state, the rotation position of the hard disk is confirmed ( _61-6 ).

[0062] Based on the imaging data of the mark 55 from the camera body 40, to ensure that the unbalance angular position P ₁ is within the allowable range with respect to the balance weight application position Q.

Next, a balance weight attachment 62 is performed.

[0064] In FIG. 2, the camera body is evacuated, a command from the program controller 45 is output to the robot 22, the robot 22 is operated, the hand 23 as shown in FIG. 3, led to the working position C _10, The balance weight 56 is attached to the position Q of the clamp ring 7.

In the case where a balance weight is additionally attached to satisfy the unbalance amount W, the hard disk is slightly rotated, and is attached adjacent to the already attached balance weight.

The above operation is performed for the clamp ring on the opposite side (63, 64).

Finally, the dynamic balance of the hard disk is measured again to confirm that the dynamic balance has been corrected (65).

The present invention is not limited to the above embodiment, but can be applied to the correction of the dynamic balance of a disk (rotating body) other than a hard disk.

[0069]

As described above, according to the first aspect of the present invention, the dynamic balance of the disk can be automatically corrected without depending on the operator.

Thus, the dynamic balance can be corrected in a clean atmosphere without generating dust or the like.

Further, the dynamic balance can be better corrected as compared with the case where the worker performs the work manually.

According to the second aspect of the present invention, it is possible to reliably determine the position where the balance weight is applied.

According to the third aspect of the present invention, it is possible to reliably confirm that the rotation of the disk has stopped due to inertia after the dynamic balance measurement.

According to the fourth aspect of the present invention, after the dynamic balance measurement, the position where the inertial rotation of the disk is stopped can be confirmed without using a dedicated means.

[Brief description of the drawings]

FIG. 1 is a principle diagram of a disk dynamic balance correcting device according to the present invention.

FIG. 2 is a plan view of a hard disk dynamic balance correcting device according to an embodiment of the present invention.

FIG. 3 is a view showing the structure and operation of the hand of the articulated robot in FIG. 2;

FIG. 4 is a diagram showing a hard disk rotation mechanism in FIG. 2;

FIG. 5 is a view showing a driving roller mechanism in FIG. 2;

FIG. 6 is a diagram for explaining a hard disk dynamic balance correction operation by the apparatus of FIG. 1;

FIG. 7 is a diagram illustrating an example of an image captured by a camera body.

FIG. 8 is a diagram showing a measurement result of dynamic imbalance of a hard disk;

FIG. 9 is a diagram showing a hard disk stop position.

FIG. 10 is a view showing a state where a balance weight attaching position is located.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disk dynamic balance corrector 2 Disk dynamic balance measuring means 3 Balance weight attaching means 4 Balance weight attaching position positioning means 5 Control means 6 Disk 7 Hub 7a, 7b Clamp ring 8 Housing 9 Test stand 20 Hard disk dynamic balance corrector Reference Signs List 22 Articulated robot 23 Balance weight grasping / sticking hand 24, 25 Finger 26 Hard disk rotation mechanism 27 Camera mechanism 28 Arm 29 Column part 30 Shaft 31 Air cylinder mechanism 32 Drive roller mechanism 33 Bearing 34 Shaft 35 Drive roller 36 Pulse motor 37 Coupling 38 Pulse motor drive circuit 40 Camera body 41 Air cylinder 42 Visual controller 45 Program controller 50 Hard disk 51 Motor 52 Rotary shaft 53 Bearing 5 4 End face 55 Mark 56 Balance weight

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshiaki Yanagita 1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Inside Fujitsu Limited (56) References JP-A-4-1546 (JP, A)

Claims (3)

(57) [Claims] A test table on which a housing in which a disk is mounted together with a hub is mounted, the housing in which the disk is mounted is mounted on the test table, and the disk is rotated to A disk dynamic balance measuring means for measuring the dynamic balance of the disk to determine an unbalanced angular position with respect to the reference angular position of the disk; and a balance weight approaching the hub in the housing mounted on the test table and at that position. a balance weight attachment means paste, by rotating the disk, the unbalance angular position, the balance weight application position positioning means occupying lead to a position where the balance weight attachment means approaches, the Disk dynamic balance measuring means, balance weight pasting position positioning means, balance weight pasting means Becomes more and control means for sequentially operating, the balance weight application position positioning means includes a camera body for imaging a mark of the end surface of the rotary shaft of the disc, the mark by binarizing the image pickup output from the camera body A visual controller for determining the position of the disk, and detecting that the signal from the visual controller has converged within a predetermined range and has not changed for a predetermined time, and that the inertial rotation after the dynamic balance measurement of the disk has stopped. have a program controller for confirmation, the measurement result及obtained by the disc dynamic balance measuring means
Based on the information from the visual controller
Rotate the disc to adjust the unbalanced angle position
Reach the position where the balance weight attaching means approaches
Disk dynamic balance adjustment device also was Mel configuration. 2. The apparatus according to claim 1, wherein said balance weight sticking position locating means includes means for rotating said disk so as to contact said hub and adjust said unbalance angle to said position. The disk dynamic balance correcting device according to claim 1, wherein: 3. A camera and visual controller according to claim 1 or claim 2, disk dynamic balance correction, characterized in that the inertial rotation after the dynamic balance measurement of the disk is configured to check the position when stopped apparatus.