JP2572686B2 - Magnetic disk drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk drive.

[0002]

2. Description of the Related Art A magnetic disk (hereinafter referred to as a disk) and a rigid body (hereinafter referred to as a center hub) for driving the disk to rotate and positioning the disk at a center (hereinafter referred to as a center ring) are integrally connected. A magnetic disk device using a disk is a conventional example (Japanese Utility Model Application Laid-Open No. 57-1).
02071). 1 to 9 are views for explaining a conventional technique, FIG. 1 is a plan view thereof, FIG. 2 is a cross-sectional view, FIG. 3 is a partial cross-sectional view taken along the line AA of FIG. 1, and FIGS. It is a figure explaining a ring. 1 and 2
As shown in FIG. 3, the center hub 3, which is a magnetic material that is integrally connected to the disk 4 and can be attracted to a magnet, has a substantially square motor shaft insertion hole 3b substantially in the center.
And a roller insertion hole 3a of the drive roller 6 for centering the disk and rotating the disk. On the other hand, the drive unit is provided with a motor shaft 5 that rotates in the direction of the arrow and becomes a center of rotation, and a drive roller 6 that applies a rotational force to the disk while centering the disk. It is elastically supported by a leaf spring 7 that can bend in a direction perpendicular to the motor shaft 5, and the leaf spring 7 is fixed to a spindle hub 8 connected to the motor shaft 5. 1 to 9
Each movement will be described.

First, the disk 4 is inserted into the magnetic disk drive, and the center hub 3 is attracted by the magnet 9 fixed to the spindle hub 8 as the disk 4 is mounted, and the center hub 3 is fixed to the spindle hub 8. Is attracted to the surface of the conductive sheet 10. At the same time, when the motor shaft 5 is inserted into the motor shaft insertion hole 3b of the center hub 3 and the position of the roller insertion hole 3a and the position of the drive roller are shifted from each other, the drive roller 6 is disengaged as shown in FIGS. By the attraction force acting between the magnet 9 and the center hub 3, the center hub 3 presses the center hub 3 in a direction perpendicular thereto.

[0004] Next, as shown in FIGS.
Starts rotating in the direction of the arrow, the disk 4 rotates the spindle hub 8 relative to the center hub 3 which is stationary due to the clamping force between the magnetic heads 1 and 2 (hereinafter referred to as the head). 6, drive roller 6 as shown in FIG.
The drive roller 6 is inserted into the roller insertion hole 3a by the restoring force of the leaf spring 7 when the position of the center hub 3 matches the position of the roller insertion hole 3a. When the rotation of the motor shaft 5 continues, the drive roller 6 rolls while being in contact with the outer twill surface 3c of the roller insertion hole 3a of the center hub 3, and rotates the center shaft 3 at the position shown in FIGS. After transmitting the force, the disk 4 will rotate integrally with the motor shaft 5 thereafter. The force F ₁ to the motor shaft 5 by the elasticity of the plate spring 7 to the drive roller 6 at this time trying to impose center hub 3 at a right angle, the force generated by the clamping force of the disk 4 and the head 2 that is, the rotation force F ₂ will work. The _{F 1} and F
_As shown in FIG. 8, the center hub 3 is rotated in the direction of the arrow with the rotation of the motor shaft 5 while being pressed against the surfaces A and B of the motor shaft 5 by the resultant force F with the motor shaft 5 as shown in FIG.
The motor shaft 5 and the center of the disk 4 are centered so that they are coaxial.

As shown in FIGS. 1 and 2, the mechanism in the conventional embodiment has the elasticity of the support of the driving roller 6 and the right angle direction of the spindle hub 8 and the right angle direction of the motor shaft 5 as one plate. The structure was created by the spring 7.
Therefore, the mounting position of the driving roller 6 depends on the mounting position accuracy of the driving roller 6 of the leaf spring 7 and the bending accuracy of the leaf spring 7,
The displacement of the drive roller 6 is affected by the accuracy of the mounting position on the spindle hub 8, that is, the force F of the drive roller 6 shown in FIGS.
There was a disadvantage that ₁ was not constant. Further, since the supporting member of the driving roller 6 also serves as a spring, the degree of freedom in shape is poor, and a certain size is required to obtain appropriate spring elasticity. With such a configuration, when the disk rotates, a force transmitting the rotation to the disk acts on the drive roller 6, and this force balances with the restoring force of the leaf spring 7 for keeping the drive roller 6 vertical. As shown in FIG. 3, the drive roller 6 tilts backward with respect to the rotation direction of the arrow of the disk 4. Further, as shown in FIG. 2, the force transmitting the rotation to the disk 4 is a frictional force generated by the pinching force between the disk 4 and the heads 1 and 2, so that the manufacturer of the disk, the type of the disk 4, Position 2,
It changes greatly depending on the operating temperature and humidity, and is not constant, so that the inclination of the driving roller 6 fluctuates significantly.
In this case, since the timing of writing and reading to and from the disk 4 is based on the position of the driving roller 6, recording and reproduction are not only unstable but also have a fatal disadvantage that the recording and reproduction become impossible. Further, since the center hub 3 is attracted by the magnet 9 and is attracted to the surface of the small circular slip sheet 10 provided at the center of the spindle hub 8, the attracting posture of the center hub 3 is unstable, and the disk rotation At times, the disk 4 has a drawback that it floats up and flutters in a direction perpendicular to the center hub 3.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic disk drive which is inexpensive and easy to assemble with respect to the above-mentioned prior art.

[0007]

According to the present invention, there is provided a disk-shaped rotating body having a first insertion hole at a substantially central portion and a second insertion hole at a position distant from the first insertion hole. In a magnetic disk drive device comprising a rotation drive mechanism having a rotation shaft engaged with a first insertion hole and a position regulating member engaged with the second insertion hole, a position separated from the rotation shaft by the rotation drive mechanism A rotatable lever member having a rotation fulcrum and supported so as not to apply an urging force in the rotation direction is provided,
The position regulating member is provided on the lever member at a position distant from the rotation fulcrum, and the lever member is configured to move to the position when the position regulating member is engaged with the second insertion hole and receives rotational power. The rotation fulcrum is provided at a position where a radial component force is generated in cooperation with the regulating member and the second insertion hole, and the rotation fulcrum is a line connecting the rotation axis and the rotation fulcrum. And a line connecting the rotation fulcrum and the position restricting member is provided at a position that maintains a certain angle without overlapping each other, and the position restricting member receives the rotating power when the position of the disk-shaped rotating body is restricted. The position of the disk-shaped rotator is regulated with respect to the rotation axis only by the radial component force of the lever member at the position.

[0008]

10 to 12 show a reference example of the present invention. FIG. 10 is a plan view, FIG. 11 is a sectional view of FIG.
FIG. 12 is a cross-sectional view taken along the line AA ′ of FIG. FIG.
19 to 19 are diagrams for explaining the centering action, and FIG. 20 is a diagram showing an embodiment of the present invention. 10 and 11
, 105 is a motor shaft, 106 is a driving roller, 108 is a spindle hub, 111 is a lever, 113
Indicates a wire spring.

As shown in FIGS. 10 and 11, the drive roller 106 is tilted slightly forward by a rigid lever 111 in the direction of rotation of the spindle hub 108 as shown by an arrow in FIG. The lever 111 is supported on the spindle hap 108 by a pin 112. Further, there is a slight gap in the fitting portion between the lever 111 and the pin 112, and the lever 111 has a structure in which the lever 111 can be inclined at right angles to the spindle hub 108 and can rotate around the pin 112. The wire spring 113 is sandwiched between the pins 112, one end of the wire spring 113 is engaged with the end of the lever 111, and the other end of the wire spring 113 is supported by the spindle hub 108. Therefore, the drive roller 106 has a structure that can move in the direction perpendicular to the spindle hub 108 and in the direction of the motor shaft 105 by the elasticity of the linear spring 113 via the lever 111. Further, the spindle hub 108 and the motor shaft 105 are integrally connected.

The operation of the reference example will be described below with reference to FIGS. 13 to 18 in comparison with the operation of the conventional example shown in FIGS.

Referring to FIG. 13 and FIG.
Is mounted, and the center hub 103 is attracted to the outermost upper surface of the spindle hub 108 by the attraction force of the magnet 109. At the same time, when the motor shaft 105 is inserted into the motor shaft insertion hole 103b of the center hub 103 and the position of the roller insertion hole 103a and the position of the drive roller 106 are shifted from each other, as shown in FIGS. The center hub 103 presses the spindle hub 108 at right angles to the spindle hub 108 by the attractive force acting between the magnet 109 and the center hub 103. Next, when the motor shaft 105 starts rotating, the disk 104
11 is stationary due to the clamping force between the heads 101 and 102 shown in FIG. 11, the spindle hub 108 rotates relatively to the center hub 103, and the position of the drive roller 106 and the center hub 16 when the position of the roller insertion hole 103a of FIG.
As shown in (1), the driving roller 106 is pushed out in a direction perpendicular to the spindle hub 108 together with the lever 111 by the restoring force of the linear spring 113, and is inserted into the roller insertion hole 103a of the center hub 103. Further, the motor shaft 105
When the rotation continues, the drive roller 106 rolls while contacting the twill surface 103c on the outside of the roller insertion hole 103 of the center hub 103 as shown in FIG. 15, and the lever 111 rotates around the pin 112 against the elasticity of the linear spring 113. The center hub 1 is rotated from the position shown in FIGS.
03, the rotational force of the motor shaft 105 starts to be transmitted, and thereafter, the disk 104 rotates integrally with the motor shaft 105.

At this time, the drive roller 106 has the wire spring 1
17, the force for pushing the center hub 103 in the direction of the arrow c shown in FIG. 17 to perform centering and the force for rotating the disk 104 act, and as shown in FIG. The center hub 103 is pressed against the surface B so that the center of the disc 104 and the motor shaft 105 are coaxial.
And the motor shaft 105 are centered.

On the other hand, as shown in FIGS. 10 and 12, the driving roller 106 has a structure capable of rotating around the pin 112 via the lever 111. As shown in FIG.
10 and 19, the position of the heads 101 and 102 is H, and the force for rotating the disk 104 generated by the clamping force between the heads 101 and 102 and the disk 104 is F _H ,
The distance from the point H to the motor shaft 105 is 1 ₁ , the pin 11
2 and the inter-axial distance _{1 3} to the motor shaft 105, when the angle of the driving roller 106 and the pin 112 and the motor shaft 105 and theta, disk 10 in the driving roller 106
Rotational force _{F 2} to 4 becomes _{F 2 = F H × 1 1} /1 2 ···.

The force acting on the drive roller 106 in the Y direction is
Restoring force F due to elasticity of wire spring 113₁Besides F₂By
F caused by₂There is a component force Fy. This force Fy in the Y direction
From the moment at pin 112₂× 1₂= F_y× 1₃  ∴Fy = F₂× 1₂/ 1₃...

[0015] The formula is substituted into the formula becomes _{Fy = F H × 1 1/} 1 3 ···.

[0016] Therefore the force in the Y direction greatly affects the centering of the disc 104, as shown by the formula expressed as a function of _{F H} and _{1 1,} there force _{F T} of _{F 2} and Fy is always the direction size of the force is constant theta ° Tobobo respect to the X direction is changed according to F _H. Is applied further restoring force _{F 1} of the wire spring 113 is driven rollers 106
The direction of the centering force acting on the second member is indicated by the resultant force F.
In FIG. 19, the center hub 103 is moved to the A
The ideal direction of the centering force that presses the surface and the surface B with the same force is the direction of the dashed arrow P. By arbitrarily setting the position of the pin 112, the direction of the resultant force F is changed to the direction of the ideal centering force. Can be approximated.

As shown in FIGS. 11 and 12, since the lever 111 is rigid, the drive roller 106 reliably transmits the rotation to the center hub 103 without being deformed by the force for rotating the disk 104. Since the drive roller 106 is tilted forward in the rotation direction of the motor shaft 105, the rotation of the motor shaft 105 causes the center hub 10 to rotate.
The center hub 3 is always in close contact with the receiving surface of the spindle hub 108 to prevent the center hub 103 from fluttering. Further, the drive roller 106 is a spindle hub 1 that rotates integrally with the motor shaft 105 via a rigid lever 111.
In FIG. 08, since the disk 104 is supported by the rigid pins 112, there is no fluctuation in the force generated by the pinching force between the disk 104 and the heads 101 and 102, and no influence due to the aging of the wire spring 113. Since the fixing to the hub 108 is ensured, there is no fluctuation in the rotational direction between the disks.
There is no flapping due to the floating of 04, and the reliability of recording / reproduction is extremely improved.

FIG. 20 is a view showing an embodiment of the present invention, in which a restoring force in a direction perpendicular to the spindle hub 208 of the lever 211 is applied by a disc spring 215 supported by a pin 212. No urging force is applied in the rotating direction. Motor shaft 2 of drive roller 206
Perpendicular force 05, as shown in Figure 19, Fy acts in accordance with the force F ₂ generated by the clamping force of the head and the disk, in order to centering the center hub 203 by force F _T and F _2, low cost It is easy to assemble.

[0019]

As described above, according to the present invention,
The rotatable lever member provided with the position regulating member includes:
Since no urging force is applied in the rotating direction, the mechanism is simplified, an inexpensive magnetic disk drive is obtained, and the assembling is simplified.

[0020]

[Brief description of the drawings]

FIG. 1 is a plan view showing a conventional example.

FIG. 2 is a sectional view showing a conventional example.

FIG. 3 is a cross-sectional view taken along the line A-A 'of FIG.

FIG. 4 is a view showing the operation of the conventional example, and is a plan view when a disc is inserted.

FIG. 5 is a view showing the operation of the conventional example, and is a cross-sectional view when a disc is inserted.

FIG. 6 is a view showing an operation of the conventional example, and is a plan view when a driving roller is inserted into a roller insertion hole of a center hub.

FIG. 7 is a view showing the operation of the conventional example, and is a cross-sectional view when a driving roller is inserted into a roller insertion hole of a center hub.

FIG. 8 is a diagram showing the operation of the conventional example, and is a plan view when a drive roller starts transmitting rotation to a disk.

FIG. 9 is a diagram showing an operation of a conventional example, and is a cross-sectional view when a drive roller starts transmitting rotation to a disk.

FIG. 10 is a plan view of a reference example of the present invention.

FIG. 11 is a sectional view of FIG. 10;

FIG. 12 is a cross-sectional view taken along the line A-A 'of FIG.

FIG. 13 is a diagram illustrating a centering action.

FIG. 14 is a diagram illustrating a centering action.

FIG. 15 is a diagram illustrating a centering operation.

FIG. 16 is a diagram illustrating a centering action.

FIG. 17 is a diagram illustrating a centering operation.

FIG. 18 is a diagram illustrating a centering action.

FIG. 19 is a diagram illustrating a centering action.

FIG. 20 is a diagram showing an example of the present invention.

[Explanation of symbols]

 1, 101, 2, 102: Head 3, 103, 203: Center hub 3a, 103a, 203a: Motor shaft insertion hole 3b, 103b, 203b: Roller insertion hole 4, 104: Magnetic disk 5, 105, 205: Motor shaft 6, 106, 206 ... drive roller 8, 108, 208 ... spindle hub 9, 109 ... magnet 111, 211 ... lever 112, 212 ... pin 113 ... wire spring 215 ... disc spring

 ──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Nao Sugiyama 3-5-5 Yamato, Suwa-shi, Nagano Pref. In Suwa Seikosha Co., Ltd. (56) References JP-A-59-132472 (JP, A) Showa 60-16953 (JP, A) Actually open Showa 57-102071 (JP, U)

Claims (1)

(57) [Claims] 1. A disk-like rotating body having a first insertion hole at a substantially central portion and having a second insertion hole at a position distant from the first insertion hole is engaged with the first insertion hole. A magnetic disk drive comprising a rotary drive mechanism having a rotating shaft and a position regulating member engaged with the second insertion hole, wherein the rotary drive mechanism has a rotation fulcrum at a position distant from the rotary shaft, and A rotatable lever member supported so as not to apply an urging force in the movement direction is provided, and the position regulating member is provided on the lever member at a position away from the rotation fulcrum, and the lever member is provided at the position When the regulating member engages with the second insertion hole and receives rotational power, the rotation fulcrum is located at a position where a radial component is generated in cooperation with the position regulating member and the second insertion hole. And the rotation fulcrum is rotated with the rotation axis. A line connecting a fulcrum and a line connecting the rotation fulcrum and the position restricting member are provided at a position that keeps an angle without overlapping each other, and the position restricting member at the time of restricting the position of the disk-shaped rotary body is provided. A magnetic disk drive device wherein the position of the disk-shaped rotating body with respect to the rotating shaft is regulated only by a radial component force of the lever member at the position where the rotating force is received.