JPS6350787B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotational drive device for rotationally driving a rotating body such as a magnetic disk.

A disk-shaped rotating body as shown in FIG. 1 is in practical use as an information recording medium.
In FIG. 1, a magnetic disk 2 as a rotating body
is stored in a flat disk case 1,
A disk hub 3 is fixed to the center of the disk 2. The disk case 1 is loaded into a predetermined position of 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 as the rotating shaft 5 is driven to rotate, the disk 2
is designed to be rotationally driven. The disk-shaped rotating body serving as the recording medium has been put to practical use as a 3.5-inch disk, and the position of the disk 2 relative to the disk device is regulated by a position regulating pin that is rotationally driven integrally with the rotating shaft 5, and is also rotationally driven. It is becoming more and more common.

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 inwardly from the side edge where the leg 8a is formed, and a position regulating pin 9 is fixed to this arm portion 8b. Position regulation pin 9
is an escape hole 11 formed near the outer periphery of the hub stand 6.
This is true. Due to the elasticity of the arm portion 8b of the leaf spring 8, the position regulating pin 9 can be tilted within the radial plane of the hub stand 6 using the foot 8a of the leaf spring 8 that contacts 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 as shown in FIG. They fit together in the relationship shown in . 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 position regulating pin 9 fits into the window hole 13. The rotating shaft 5 and the hub 3 integrated therewith are the fourth
Assuming that it rotates counterclockwise in the figure,
The position regulating pin 9 hits one end of the window hole 13,
Further, the position regulating pin 9 tends to tilt outward in the radial direction due to the elasticity of the arm portion 8b of the leaf spring 8, 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 position regulating pin 9, and the resultant force of both causes the fourth force to be applied to the hub 3.
As shown in the figure, the hub 3 is positioned with the rotating shaft 5 in contact with one corner of the center hole 12 of the hub 3, and the position regulating pin 9 in contact with one corner of the window hole 13, respectively. As the position regulating pin 9 rotates, the hub 3 is rotationally driven. Since the magnetic disk is integrally fixed to the hub 3 as mentioned above,
The magnetic disk is rotationally driven together with the hub 3. In addition, a Hyaku magnet 10 is attached to the outer peripheral edge of the upper surface of the hub stand 6.
When the rotating body is fixed and the rotating body is loaded, the hub 3 of the rotating body made of a magnetic material is attracted to the Hiraku magnet 10, thereby preventing the rotating body from moving inadvertently.

However, according to the above-mentioned conventional rotary drive device, the arm portion 8b of the leaf spring 8 tilts inward with the surface of the rotor 7 as a fulcrum, and the position of the rotating body is controlled by the position regulating pin 9 fixed to the arm portion 8b. The leaf spring 8
The arm portion 8b must not only tilt the position regulating pin 9 in the radial direction of the hub 3, but also ensure that the position regulating pin 9 can escape when the position regulating pin 9 and the window hole 13 of the hub 3 do not match. This requires a large tilt. If the inclination of the arm portion 8b of the leaf spring 8 is to be made as small as possible, the length of the arm portion 8b of the leaf spring 8 must be increased, and the leaf spring 8 will protrude outward and the device will become larger. There is a problem. Further, a member is required to abut the leg portion 8a, which serves as a fulcrum for the inclination of the arm portion 8b of the leaf spring 8, which poses a design restriction.

An object of the present invention is to have a rotary drive shaft for attaching a disk-shaped rotating body, and a position regulating pin that rotates integrally with the rotary drive shaft to regulate the position and rotationally drive the rotary body. In the drive device, it is possible to secure escape of the position control pin while reducing the inclination of the position control pin, which allows the device to be made smaller, and provides a rotary drive device with fewer design restrictions. It's about doing.

A feature of the present invention is that the position regulating pin is attached to a first leaf spring having a certain spring constant, and the first leaf spring is attached to a second leaf spring having a larger spring constant than the first leaf spring.
The reason is that it is attached at a position on the outer periphery of the above-mentioned position regulating pin with the rotational drive shaft as the center.

The present invention will be described below with reference to the embodiments shown in FIGS. 5 to 9.

5 to 8, a frame 21 integrally attached to a motor case etc. has a bearing sleeve 2.
2 is fitted and fixed, and a rotary drive shaft 4 is inserted into this bearing cylinder 22 via an oil-impregnated metal 24 and a ball bearing 23.
5 is rotatably supported. Rotation drive shaft 45
is integrally attached to the rotor of a motor (not shown). A hub stand 46 is fitted and fixed to the rotating shaft 45 above the frame 21 . A leaf spring 40 having a certain spring constant is attached to the lower surface of the hub stand 46 so as to straddle the hub stand 46 in the diametrical direction. The leaf spring 40 has a ring-shaped planar shape so as to escape the rotary drive shaft 45, and is bent along a diametrical line to form a shelf-shaped portion spaced apart from the lower surface of the hub base 46. 40a, and a rising portion 40b at the tip of the shelf-like portion 40a. A leaf spring 48 having a smaller spring constant than the leaf spring 40 is fixed to the rising portion 40b of the leaf spring 40 by a caulking portion 50. Here, the leaf spring 48 is a first leaf spring, and the leaf spring 40 is a second leaf spring. A position regulating pin 49 is fixed to the tip of the first leaf spring 48 . First leaf spring 48
can be deflected by pushing down the position regulating pin 49, but the fulcrum position of the deflection is
The fixed portion 50 for the second leaf spring 40 is located at a position on the outer periphery of the position regulating pin 49 around the rotary drive shaft 45, and the pin 49 can be tilted in the radial direction of the hub stand 46 due to the deflection of the spring 48. It's becoming like that. The pin 49 passes through an escape hole 46a provided in the hub stand 46 with a space margin, and the upper end portion of the pin 49 is exposed from the upper surface of the hub stand 46. The first leaf spring 48 is provided with a pair of foot portions 48a, 48a, and a protrusion 49a with a width sufficient to straddle the pin 49 in the diametrical direction is formed at the lower end of the position regulating pin 49. Section 48
a and the protrusion 49a are the shelf-like portions 4 of the second leaf spring 40.
It faces 0a with a certain gap. As shown in FIG. 7, when the rotating body is loaded, the pin 49 comes into contact with one wall surface of the window hole 13 of the hub 3 of the rotating body, and the leaf spring 48 is slightly bent to position the rotating body. In this case, the two foot portions 48a, 48a of the leaf spring 48 are connected to the shelf-like portion 4 of the second leaf spring 40.
0a, or the protrusion 49a of the pin 49 hits the shelf 40a of the leaf spring 40, and as a result,
Lateral vibration of the pin 49, that is, rocking of the pin 49 in the circumferential direction of the hub stand 46 is prevented. As shown in FIG. 9, the position regulating pin 49 is fixed by spot welding or the like at a position 51 as far as possible from the fulcrum of the first leaf spring 48, and when the pin 49 is pushed down, the leaf spring 48
The range of deflection is made as large as possible.

Next, the operation of the above embodiment will be explained. When no rotating body is loaded, as shown in FIG. 6, the elasticity of the second leaf spring 40 pushes up the first leaf spring 48, and the elasticity of the first leaf spring 48 pushes The regulation pin 49 is pushed up,
The upper end of the pin 49 is exposed from the upper surface of the hub stand 46. In such an embodiment, it is assumed that a rotating body is then loaded. At this time, if the position of the position regulating pin 49 and the position of the rectangular window hole 13 in the hub 3 of the rotating body do not match, the position regulating pin 49 will be pushed down by the hub 3 of the rotating body. When pressed down, the first leaf spring 48 with a small spring constant first moves to the second leaf spring 40.
When the position regulating pin 49 is bent inward by using the fixed portion 50 as a fulcrum, and the inclination of the position regulating pin 49 exceeds a certain amount, the protrusion 49a of the pin 49
Alternatively, the foot portions 48a, 48a of the leaf spring 48 press the shelf portion 40 of the second leaf spring 40, and the second leaf spring 40 having a large spring constant is bent to allow the position regulating pin 49 to descend. When the rotary drive shaft 45 and the hub stand 46 integrated therewith begin to rotate as the rotary body is loaded, the position regulating pin 49 and the window hole 1 of the hub 3 of the rotary body begin to rotate.
3 match and the position regulating pin 49 is connected to the leaf springs 40, 4.
It tries to return to its original position due to the elasticity of 8. Here, the second leaf spring 40 having a relatively large spring constant returns to almost the original position, but the position regulating pin 49 hits the outer peripheral wall of the window hole 13 of the rotating body and is tilted inward. As a result, the first leaf spring 48 with a small spring constant is connected to the fixed part 50 of the second leaf spring 40.
Take a bent position using this as a fulcrum. Therefore, the first leaf spring 48 has a force that tends to return the position regulating pin 49 to its original position, and this force causes the position regulating pin 49 to move outward from the outer wall surface of the window hole 13 of the rotating body. Press. On the other hand, when the position regulating pin 49 is rotationally driven together with the rotational drive shaft 45, the pin 49
hits one side wall surface of the window hole 13, and as a result, due to the force pushed outward by the pin 49 and the force pushed in the circumferential direction, the position of the rotating body is regulated as already explained in FIG. It will be rotated.

Also, when the rotating body is loaded, the position regulating pin 4
When the position of 9 matches the position of the window hole 13 of the rotating body, a part of the position regulating pin 49 is pushed by the outer edge that defines the window hole 13, and the first plate spring 48 is pushed. By bending and tilting the position regulating pin 49 inward, the position regulating pin 49 enters the window hole 13.
Thereafter, as described above, the rotating body is rotationally driven while its position is regulated by the position regulating pin 49.

Note that the present invention is not limited to a drive device for a 3.5-inch disc-shaped rotary body, but includes a rotary drive shaft that rotates integrally with the rotary drive shaft, regulates the position of the rotary body, and rotationally drives the rotary body. The present invention is applicable to any drive device as long as it has a position regulating pin.

According to the present invention, the force for regulating the position of the disc-shaped rotating body by the position regulating pin is applied by the first leaf spring having a certain spring constant, and the necessary clearance of the position regulating pin is provided by the first leaf spring. Since the second leaf spring with a larger spring constant is used to allow this, it is possible to secure sufficient clearance for the position regulating pin while reducing the inclination of the position regulating pin. Since there is no need to extend the fulcrum of the inclination of the regulating pin to the outside, it is easy to downsize the device. In addition, since the fulcrum of the tilt of the position regulating pin is the fixed part between the first leaf spring and the second leaf spring, there is no need to find the fulcrum in another member, which has the effect of reducing design restrictions. be.

[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. FIG. 5 is a plan view showing an embodiment of the present invention, FIG. 6 is a sectional view of the same embodiment, FIG. 7 is a sectional view showing a different operating mode, and FIG. FIG. 9 is a side view showing the position regulating pin portion in the above embodiment, and a front view showing the position regulating pin portion in different operating states. 2... Disc-shaped rotating body, 3... Hub of the rotating body, 40... Second leaf spring, 45... Rotation drive shaft, 46... Hub stand, 48... First leaf spring, 4
9... Position regulation pin, 50... First leaf spring attachment portion.

Claims (1)

[Claims] 1. A drive device comprising a rotational drive shaft for attaching a disk-shaped rotating body, and a position regulating pin that rotates integrally with the rotational drive shaft to regulate the position and rotationally drive the rotating body, the above-mentioned The position regulating pin is attached to a first leaf spring having a certain spring constant, and the first leaf spring is attached to a second leaf spring having a larger spring constant than the first leaf spring, and the position regulating pin is attached to a second leaf spring having a larger spring constant than the first leaf spring. A rotary drive device characterized in that it is attached at a position on the outer periphery of the pin.