JPH0222842Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a rotational drive device for rotationally driving a rotating body such as a magnetic disk.

(Prior Art) A disk-shaped rotating body as shown in FIG. 1 has been put into practical use as a recording medium for information signals. 1st
In the figure, a magnetic disk 2 as a rotating body is housed in a flat disk case 1, and a disk hub 3 is fixed to the center of the disk 2. The disk case 1 is loaded into a predetermined position on the disk device using the positioning pin 4, and the rotating shaft 5 of the disk device fits into the center hole of the disk hub 3, and the disk 2 rotates as the rotating shaft 5 is driven to rotate. It is becoming driven. The disk-shaped rotating body serving as the recording medium is put into practical use, for example, as a 3.5-inch disk, and the position of the disk 2 relative to the disk device is regulated by a drive pin that is rotationally driven integrally with the rotating shaft 5, and the disk 2 is rotated. Driven.

FIGS. 2 and 3 show a conventional example of a drive device for a disk-shaped rotating body serving as the recording medium. Second
In the figures and FIG. 3, a hub stand 6 is fitted and fixed to the rotating shaft 5, and a rotor 7 of a drive motor is fixed to the lower surface side of the hub stand 6. A leaf spring 8 is integrally attached between the hub stand 6 and the rotor 7. The leaf spring 8 has one outer edge bent to form a leg 8a that comes into contact with the rotor 7, and
An arm portion 8b extends inward from the edge on the side where the leg 8a is formed, and this arm portion 8b
A drive pin 9 is fixedly planted in the. Drive pin 9
is an escape hole 11 formed near the outer periphery of the hub stand 6.
This is true. The drive pin 9 is connected to the arm portion 8 of the leaf spring 8.
Due to the elasticity of b, the hub stand 6 can be tilted in the radial plane using the foot 8a of the leaf spring 8 that comes into contact with the rotor 7 as a fulcrum.

When a rotary body as shown in FIG. 1 is loaded into the conventional rotary body drive device configured as described above, the hub 3 of the rotary body is moved as shown in FIG. fit together in a relationship. In FIG. 4, the hub 3 has a square center hole 12 formed at its center, and a rectangular window hole 13 at a position offset from the center, which allows the rotating body to be positioned at a predetermined position. When loaded, the rotating shaft 5 fits into the center hole 12 and the drive pin 9 fits into the window hole 13.
Assuming that the rotating shaft 5 and the hub 3 integral therewith rotate counterclockwise in FIG. 4, the driving pin 9 hits one longitudinal end of the window hole 13, and the driving pin 9 Due to the elasticity of the arm portion 8b of 8, the arm portion 8b tends to tilt radially and outwardly and hits the outer edge of the window hole 13. As a result, a force in the circumferential direction and a force in the radial direction are applied to the hub 3 by the drive pin 9, and the resultant force of the two forces causes the rotating shaft 5 to move toward one corner of the center hole 12 of the hub 3, as shown in FIG. Then, the hub 3 is positioned with the drive pins 9 in contact with one corner of the window hole 13, and
As the drive pin 9 rotates, the hub 3 is rotationally driven. Since the magnetic disk is integrally fixed to the hub 3 as described above, the magnetic disk is rotated together with the hub 3.

A permanent magnet 10 is fixed to the outer peripheral edge of the upper surface of the hub stand 6, and when a rotating body is loaded, the hub 3 of the rotating body made of a magnetic material is attracted to the permanent magnet 10, preventing the rotating body from moving inadvertently. is prevented.

(Problem to be solved by the invention) According to the above conventional rotary drive device, the drive pin 9
When the rotating body is driven to rotate, the driving pin 9 is subjected to a force F in the circumferential direction due to the reaction force of the rotating body, as shown in FIG. 5, and the drive pin 9 is tilted. When the drive pin 9 tilts in the circumferential direction in this way, the relative position of the hub base 6 and the rotating body in the circumferential direction shifts or fluctuates, resulting in a shift in the index period or rotational jitter of the rotating body. This results in the problem of an increase in

The purpose of the present invention is to prevent the drive pin from tilting in the counter-rotation direction of the rotation axis due to the reaction force of the rotation body when the rotation body is driven by the drive pin, thereby preventing deviation in the index period. Another object of the present invention is to provide a rotational drive device that reduces rotational jitter of a rotating body.

(Means for Solving the Problems) In the present invention, the drive pin to be rotated together with the rotation shaft by the motor is attached to the leaf spring, and the drive pin is inserted through the drive pin insertion portion of the hub base. The tip portion is provided so as to be able to engage with a disk-shaped rotating body, and the drive pin is inserted into the drive pin insertion portion of the hub stand so that the drive pin is inserted into the drive pin in response to the reaction force of the rotating body when the rotating body rotates. The present invention is characterized in that a regulating portion is provided for regulating tilting of the rotating shaft in the counter-rotational direction.

(Function) When the drive pin is rotated while the tip of the drive pin is engaged with the rotating body, the plate spring to which the drive pin is attached tends to bend due to the reaction force of the rotating body. However, the drive pin is installed through the drive pin insertion part of the hub base, and this insertion part is provided with a restriction part that restricts the drive pin from tilting in the counter-rotational direction of the rotating shaft due to the reaction force of the rotating body. Therefore, the inclination of the drive pin is regulated.

(Example) Hereinafter, an example of the rotary drive device according to the present invention will be described with reference to FIGS. 6 to 8.

In FIG. 6, a rotating shaft designated by reference numeral 15 is rotationally driven by a motor (not shown), and a hub stand 16 is provided integrally with this rotating shaft 15 to which a disk-shaped rotating body is attached. ing. A leaf spring 18 is fixed to the lower surface of the hub stand 16. A drive pin 19 is fixed to an arm portion 18b extending inwardly from one side edge of the leaf spring 18 so as to be able to urge a disk serving as a rotating body radially outward. That is, the arm portion 18b of the leaf spring 18 has a fulcrum of deflection radially outward from the drive pin 19 with respect to the rotating shaft 15, so that the drive pin 19 is bent within the radial plane of the hub base 16. Can be tilted. The drive pin 19 passes through a groove-shaped drive pin insertion portion 16a formed in the radial direction of the hub base 16, and the tip of the drive pin 19 protrudes above the drive pin insertion portion 16a to engage with the rotating body. It is set up so that it can be combined. The drive pins 19 are close to or in contact with the wall surfaces on both sides of the drive pin insertion portion 16a.

According to the above embodiment, when the rotating body is mounted on the hub base 16 and the driving pin 19 is driven to rotate together with the rotating shaft 15, the tip of the driving pin 19 engages with the rotating body, and the driving pin 19 is rotated by the rotating body. The leaf spring 18 bends due to the reaction force, and the drive pin 19 tries to tilt in the counter-rotational direction around the rotating shaft 15, but the hub stand 16
The side wall of the drive pin insertion part 16a acts as a regulating part to prevent the drive pin 19 from tilting in the direction opposite to the rotation of the rotating shaft 15, thereby preventing deviations in the index period and reducing rotational jitter of the rotating body. It will be done. Further, since the regulating part that regulates the tilting of the drive pin 19 in the counter-rotational direction of the rotation shaft 15 can be formed by the side wall of the drive pin insertion part 16a, there is an advantage that the structure is simplified.

Next, the embodiments shown in FIGS. 7 and 8 will be described. 7 and 8, a rotating shaft 2 rotatably supported by a substrate 22 via a bearing 20.
A hub stand 26 is fitted and fixed to the hub stand 5, and a rotor case 21 of the drive motor is fixed to the lower surface side of the hub stand 26. A drive coil 23 is fixed on the substrate 22 , and the coil 23 faces a permanent magnet 24 fixed to the lower surface of the rotor case 21 . A drive motor is constituted by the rotor case 21, the magnet 24, the coil 23, etc., and together with the rotor case 21, the hub stand 26 and the rotating shaft 25 are rotationally driven. A base portion of a leaf spring 28 oriented in the radial direction of the case 21 is fixed on the rotor case 21 at a position near the outer periphery of the case 21.
A drive pin 29 is fixed to the tip of the leaf spring 28 located near the inner periphery. The leaf spring 28 is
The drive pin 29 has a fulcrum of deflection outward from the rotation shaft 25 than the drive pin 29, and the deflection of the leaf spring 28 allows the drive pin 29 to tilt in the radial direction of the hub stand 26. The drive pin 29 is located within a groove-shaped drive pin insertion portion 26a provided in the radial direction of the hub stand 26. The tip of the drive pin 29 is connected to the drive pin insertion portion 26
protrudes to the upper surface side of the hub stand 26 via a,
The tip of the drive pin 29 is capable of engaging with a rotating body mounted on the hub stand 26. Both side wall surfaces of the driving pin insertion portion 26a constitute a regulating portion that restricts the driving pin 29 from tilting in the counter-rotational direction of the rotating shaft 25 against the reaction force of the rotating body when the rotating body rotates. The pin 29 is the drive pin insertion part 2
By approaching or touching both side wall surfaces of 6a,
The inclination of the drive pin 29 in the circumferential direction is restricted.

In this way, also in the case of the above embodiment, the drive pin 29
This prevents the index period from tilting, thereby preventing deviations in the index period, and reducing rotational jitter of the rotating body. Further, since the regulating portion that regulates the tilting of the drive pin 29 in the counter-rotational direction of the rotation shaft 25 can be formed by the side wall of the drive pin insertion portion 26a, there is an advantage that the structure is simplified.

(Effect of the invention) According to the invention, the tip of the drive pin is provided so that it can engage with the rotating body through the drive pin insertion part of the hub base, and the drive pin insertion part of the hub base is , a regulating part is provided to restrict the drive pin from tilting in the counter-rotation direction of the rotation axis due to the reaction force of the rotation body when the rotation body rotates, so that when the rotation body is rotationally driven by the drive pin, the drive pin is not tilted. Inclination of the pins is prevented, and deviations in index period and rotational jitter of the rotating body can be reduced.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an example of a rotating body that can be used in the present invention, Fig. 2 is a plan view showing an example of a conventional rotary drive device, Fig. 3 is a sectional view of the same, and Fig. 4 is a sectional view of the above conventional rotary drive device. FIG. 5 is a sectional view of the driving pin portion for explaining the problems of the conventional example, and FIG. 6 is a plan view showing an embodiment of the rotary drive device according to the present invention. 7 is a plan view showing another embodiment of the rotary drive device according to the present invention, and FIG. 8 is an enlarged sectional view of the same embodiment. 15, 25... Rotating shaft, 16, 26... Hub stand, 16a, 26a... Drive pin insertion part, 18,
28... Leaf spring, 19, 29... Drive pin.

Claims (1)

[Scope of utility model registration request] It has a hub stand provided integrally with a rotating shaft driven by a motor to which a disc-shaped rotating body is attached, and a drive pin that rotates integrally with the hub stand to rotationally drive the rotating body. In the drive device, the drive pin is attached to a leaf spring and is provided so that a tip end of the drive pin can engage with the rotating body through a drive pin insertion portion of the hub base, and , a regulating portion is provided in the drive pin insertion portion of the hub base to prevent the drive pin from tilting in the counter-rotational direction of the rotating shaft in response to a reaction force of the rotating body when the rotating body rotates. Rotary drive device.