JP2871386B2 - Disk rotation 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 disk drive for use in a floppy disk drive or the like.

[0002]

2. Description of the Related Art In a floppy disk drive device or the like, a drive for positioning a disk and rotating the disk by engaging with a hub base and an engagement hole of a disk hub protruding from the hub base and mounted on the hub base. A disk rotation drive device having pins is used. In such a disk rotation drive device, the drive pins are urged in a direction perpendicular to the hub base, that is, in the spindle direction, to engage the engagement holes of the disk hub, and the drive pins are positioned in the hub base to position the disk. Must be biased in the radial direction, i.e., at right angles to the spindle.

As a conventional example of such a disk rotation drive device, there is known a disk rotation drive device in which a drive pin is attached to one leaf spring to urge the drive pin in a spindle direction and a direction perpendicular to the spindle. I have. Japanese Unexamined Utility Model Publication No. 2-76352 discloses an example. According to such a conventional example, in a state where the drive pin is engaged with the engagement hole of the disk hub and the disk is positioned on the hub base, the drive pin is inclined inward toward the spindle.

[0004]

According to the above-mentioned conventional disk rotation driving device, when the urging force of the driving pin in the radial direction of the hub base due to the elastic force of the leaf spring is strong, the disk is positioned with respect to the hub base. At the time of ejection, the drive pin may stop halfway without reaching the regular position of the engagement hole of the disk hub due to the frictional force with the side surface of the engagement hole of the disk hub. Then, the positioning of the disk hub with respect to the hub base becomes incomplete, and the index signal cannot be read. Further, as described above, since the drive pin is tilted inward toward the spindle with the disk positioned on the hub base, the end face of the tilted drive pin is engaged with the edge of the engagement hole of the disk hub. ,
The disk hub may be lifted up by the drive pin. Then, there is a problem that the contact between the recording / reproducing head and the disk becomes unstable, and an error occurs when recording and reading signals.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and it is possible to completely and surely position a disk hub with respect to a hub base and to prevent the disk hub from floating with respect to the hub base. To stabilize the contact between the recording / reproducing head and the disk and to provide a low-cost disk rotation drive device with a reduced number of components.

[0006]

In order to achieve the above object, the present invention provides a hub base and a hub base protruding from the hub base.
A drive pin that engages with an engagement hole of a disk hub placed on the disk to perform positioning of the disk and rotational drive of the disk ;
In a disk rotation drive device having a support spring for urging the drive pin, the drive pin has a stepped cylindrical shape.
The engaging portion is provided on the end face of the large diameter portion,
The moving pin is formed by engaging a support spring with the engaging portion.
Ri, is restricted rotation relative to the support spring, and movement in the radial direction of the disc is possible and Tsu Do, the support spring
Rotate the drive pin to the disc radius while rotating
It is characterized by being biased in the direction. Also, take the
The drive pin is attached to the magnet holder
A guide hole is provided for guiding movably in the radial direction.
If the step of the drive pin is supported by the edge of this guide hole,
It is pressed by the urging force of the ne. The drive pins are
It is characterized by being able to rotate with respect to the hub stand.

[0007]

When the hub is relatively rotated with respect to the disk hub and the position of the drive pin coincides with the engagement hole of the disk hub, the drive pin jumps into the engagement hole by the urging force of the support spring. When the hub is further rotated, the drive pin is pushed by the side surface of the engagement hole and moved in the disk radial direction. With the movement of the drive pin, the support spring rotates around the fulcrum while being urged. The drive pin is mounted so that the rotation with respect to the support spring is restricted and the drive pin can be moved in the radial direction of the disk, so that the drive pin moves relative to the disk hub with the rotation of the support spring. As a result, the drive pin does not stop halfway due to the frictional force with the side surface of the engagement hole, and the drive pin reliably reaches the proper position of the engagement hole of the disk hub. A guide hole for guiding the drive pin in the disk radial direction is provided on the hub base side, and the step of the drive pin is pressed against the edge of the guide hole by the biasing force of the support spring, thereby positioning the disk hub on the hub base. Then, the drive pin can be set upright with respect to the hub base.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a disk rotation drive device according to the present invention. In FIGS. 1 to 5, reference numeral 1 denotes a spindle which forms a rotating shaft of a motor, and a hub 2 is integrally attached to one end of the spindle 1 by resin molding or the like.
A flat cup-shaped magnet receiver 3 is integrally mounted on the outer peripheral side of the lower surface of the hub base 2. A chucking magnet 4 is mounted between the inner peripheral surface of the magnet receiver 3 and the outer peripheral surface of the hub base 2. The chucking magnet 4 has a shape in which a part of a ring is cut out, and a guide hole 6 in the radial direction is formed in the magnet receiver 3 at a position overlapping the notch of the chucking magnet 4.

A drive pin 5 is disposed through the guide hole 6. The drive pin 5 is formed in the shape of a stepped column . The large diameter portion 7 is below the magnet receiver 3, and the small diameter portion penetrates the guide hole 6. Large diameter portion 7 of drive pin 5
A split groove 8 as an engaging portion is formed in the bottom surface side of the diametrical direction. One end 11 of a support spring 10 composed of a wire spring having a round cross section is formed in the split groove 8 with respect to the split groove 8. It is slidably fitted. The support spring 10 is wound around a pin 9 provided on the magnet receiver 3 at an intermediate portion in the longitudinal direction. One end 11 of the support spring 10 can rotate about the pin 9 in a plane substantially parallel to the plane of the magnet receiver 3. The other end of the support spring 10 cannot be moved by being hung on a pin 12 provided on the magnet receiver 3. One end 11 of the support spring 10 urges the drive pin 5 in a direction of protruding from the upper surface of the hub base 2, that is, in a direction of pushing up the spindle 1 direction. 6 is pressed against both side edges, so that the drive pin 5 stands upright with respect to the hub base 2. The support spring 10 urges the drive pin 5 outward in the radial direction of the hub base 2.

The drive pin 5 is guided by the guide hole 6 and can move in the radial direction of the disk. On the other hand, one end 11 of the support spring 10 is
Of the drive pin 5
Cannot rotate relative to one end 11 of the support spring 10. However, as will be described in detail later, when the one end 11 of the support spring 10 rotates toward the spindle 1 with the pin 9 as a fulcrum, the drive pin 5 is guided by the guide hole 6 and While linearly moving toward the spindle 1 in the radial direction, one end 1 of the support spring 10
1 changes with respect to the hub 2, the drive pin 5
Rotates relative to the hub 2. One end 11 of the support spring 10 extends in a direction substantially perpendicular to the radial direction of the hub base 2.

When the drive pin 5 is used to position the disk with respect to the hub 2 and rotate the disk, the drive pin 5
As shown in FIG. 6, a magnet receiving portion is provided at the edge of the guide hole 6 on the rear side in the rotation direction of the hub base so as to maintain the vertical position more stably with respect to the hub base 2. A stopper 14 may be provided by cutting and raising a part of 3, and the inclination of the drive pin 5 may be regulated by the stopper 14.

The urging force of the drive pin 5 by the one end 11 of the support spring 10 is such that the step of the drive pin 5 is pressed against the lower surface of the magnet receiver 3 as described above and as shown in FIG. That is, a biasing force Fa in a direction orthogonal to the surface of the hub base 2 and a radially outward biasing force Fb of the hub base 2 for positioning the disk with respect to the hub base. Therefore, the urging direction of the drive pin 5 by the one end 11 of the support spring 10 may be set in the Fz direction which is the resultant force of the urging forces Fa and Fb.

Next, the operation of the above embodiment will be described with reference to FIGS. Now, it is assumed that the disc is loaded at a predetermined position by a predetermined operation. The disk hub 15 shown in FIG. 8 is made of a magnetic material such as an iron plate,
The disk hub 15 is attracted by the chucking magnet 4, and the disk hub 15 is placed on the hub base 2, and the upper end of the spindle 1 is fitted into the square center hole 16 of the disk hub 15. At this time, in many cases, the drive pin 5 and the rectangular engaging hole 17 of the disk hub 15 do not match as shown in FIG.
5, the one end 11 of the support spring 10 bends downward to allow the drive pin 5 to escape downward. Next, when the spindle 1 and the hub base 2 and other components integrated therewith are rotationally driven by a motor (not shown), the drive pin 5 approaches the engagement hole 17 of the disk hub 15, and FIG. When the drive pin 5 is aligned with the engagement hole 17 as shown in FIG.
The drive pin 5 moves in a direction perpendicular to the disk hub 15 by the urging force of the support spring 10 and jumps into the engagement hole 17.

By further rotating the hub base 2 and the like,
The drive pin 5 contacts the outer peripheral side surface 18 of the engagement hole 17 and moves toward the inner diameter side of the hub base 2 against the elastic force of the support spring 10 to bias the support spring 10. And the drive pin 5
8C reaches the corner on the front end side in the disk rotation direction of the engagement hole 17 as shown in FIG. 8C, transmits the rotational force to the disk hub 15, and drives the disk hub 15 and the disk integral therewith. . The urging force of the support spring 10 acts as a force for pushing the disk hub 15 outward as shown by an arrow C in FIG. 8C. By the force in the direction of arrow C and the force for driving the disk hub 15 to rotate, the outer periphery of the spindle 1 abuts on two points A and B at predetermined corners of the square center hole 16 of the disk hub 15, The center of the disk and the spindle 1 are centered so that they are coaxial.

When the disk is centered in this way, the drive pin 5 is guided by the guide hole 6 provided in the magnet receiver 3 and moves in the radial direction of the hub base 2. The guide hole 6 is formed along a line passing through the center of the hub base 2 and is set to a dimension that allows the drive pin 5 to slide smoothly without rattling. Then, as shown in FIG. 8D, when the centering of the disk hub 15 is completed, the drive pin 5 is pressed against the rear side surface of the guide hole 6 in the disk rotation direction. 2 is securely connected, and there is no mutual displacement in the rotational direction. Further, the drive pin 5 is connected to the support spring 1.
Since it is slid while being pressed against the lower surface of the magnet receiver 3 by the elastic force of 0, the posture is always perpendicular to the surface of the hub base 2 and the drive pin does not tilt unlike the conventional example. Even if any force is applied from a right angle direction, there is an effect that the disk hub 15 is prevented from floating from the surface of the hub base 2.

Further, from the start to the end of the centering operation when the drive pin 5 comes into contact with the side surface 18 of the engagement hole 17 of the disk hub 15, the drive pin 5 remains in the engagement hole 17 of the disk hub 15. It is pushed by the side surface 18 and moves toward the center of the hub base 2 along the guide hole 6. At the same time, the one end 11 of the support spring 10 rotates about the pin 9 as a fulcrum, and the mounting angle with respect to the pin 9 changes. 9 and 10
Indicates this operation. As shown in FIGS. 9A, 9B, and 9C, from the start of the centering operation to the end thereof,
The mounting angle of the one end 11 of the support spring 10 to the pin 9 changes in the order of θ ₁ , θ ₂ , θ ₃ . Since the one end 11 of the support spring 10 is slidably fitted in the split groove 8 of the large diameter portion 7 of the drive pin 5, the rotation of the drive pin 5 is restricted with respect to the support spring 10. One end 11 of the support spring 10
The drive pin 5 also moves in the radial direction of the hub base 2 with a change in the mounting angle of the hub 9 with respect to the pin 9, and the drive pin 5 rotates on the hub base 2. The rotation of the drive pin 5 causes the engagement hole 17 of the disk hub 15 and the drive pin 5 to rotate.
In addition to reducing the frictional force with the drive pin 5, the drive pin 5 performs an operation of urging the engagement hole 17 of the disk hub 15 in the direction of progress of the centering operation. 15 is not caught on the side surface of the engagement hole.

Next, various modifications of the disk rotation drive device according to the present invention will be described. The example shown in FIG.
In a modified example of the shape of the support spring 10 and its holding structure, the other end 24 of the support spring 10 is folded back, the folded portion is hung on the pin 12, and the lower surface of the hub 2 is brought into contact with the lower peripheral surface by its elastic force. It is a thing. By doing so, the support spring 10 is stably held. The support spring 10
It is preferable that the drive pin can give a necessary and sufficient rotation angle at the time of centering and positioning of the disk hub by the drive pin.

In a state where the drive pin is engaged with the engagement hole of the disk hub to perform centering and positioning of the disk hub, in order to keep the attitude of the drive pin more stable,
As shown in FIG. 12, in addition to the diametrically dividing groove 8 on the lower surface side of the large-diameter portion 7 of the stepped cylindrical driving pin, a wide dividing groove 28 is provided in a direction perpendicular to the diameter. Spring 10
Is provided with a bent portion 26 in the right angle direction at the other end of the support spring 10.
Of the spring 1 is slidably fitted in the split groove 8.
The zero bent portion 26 may be fitted into the split groove 28. Since the width of the split groove 28 is large, the spring 10 can slide within the range of the split groove 28. As described above, since the spring 10 presses the drive pin 5 with the two pieces perpendicular to each other, there is an advantage that the drive pin 5 is hardly inclined and the posture is stabilized. The shape of the spring 10 and the shape of the engaging portion of the drive pin in which the spring 10 fits may be appropriately changed. Also,
A hole into which a spring can be inserted may be provided instead of the split groove of the drive pin.

Since the rotation of the drive pin relative to the support spring in the present invention is restricted, the rotational position of the drive pin itself is substantially constant. Therefore, as shown in FIG.
It is more preferable that the upper end surface of the drive pin 5 be an inclined surface 29 in which the rotation center side of the hub stand is lowered. In this case, FIG.
When the disk hub 15 is mounted on the drive pin 5 at the time of loading the disk, the disk hub 15 inclines along the inclined surface 29 of the drive pin 5, so that the drive pin 5 rotates together with the hub base to perform the centering operation. Is started, the drive pin 5 can smoothly jump into the engagement hole 17. On the other hand, when the upper end surface of the drive pin 5 is not inclined, when the disc hub 15 is mounted on the drive pin 5,
As shown in FIG. 13A and FIG.
And the upper end surface intersect the surface and the driving pin 5, the upper end surface of the driving pin 5 at the centering operation start may caught by the edge of the engagement hole 17 of the de Isukuhabu 15, the centering operation is smoothly performed There may not be. In FIG. 13, reference numeral 30 indicates a disk provided integrally with the disk hub 15.

The disk rotation driving device according to the present invention may be directly incorporated in a rotor case of a motor. FIG. 15 shows an example. In FIG. 15, a motor rotor case 32 is provided integrally with a lower outer peripheral portion of a hub 2 provided integrally with the spindle 1. The rotor case 32 can be regarded as also serving as the magnet receiver 3 in the above-described embodiment. The chucking magnet 4 is mounted on the rotor case 32, and the same drive pins 5 and supporting members as those in the above-described embodiment are used. A spring is mounted as in the previous embodiment. A drive magnet 33 is attached to the inner periphery of the rotor case 32, and a frequency power generation magnet 34 is attached to the outer periphery of the rotor case 32.

FIG. 16 shows the hub base and the chucking magnet.
As in the example shown in FIG. In FIG. 16, reference numeral 35 denotes a hub that also serves as a chucking magnet, and the hub 35 is formed by integral molding of a resin magnet. The drive pin 5 and the support spring similar to those in the above-described embodiment are attached to the hub base 35 in the same manner as in the above-described embodiment. A metal frame 36 is fitted on the edge of the guide hole that guides the drive pin 5 so as to be movable in the radial direction of the disk, so that the drive pin 5 moves smoothly along the guide hole. The above embodiment
In the following description, the drive pin is shaped like a stepped cylinder
However, a cylindrical shape with a step may be used.

[0022]

According to the present invention, the rotation of the drive pin is restricted with respect to the support spring. However, when the drive pin is engaged with the engagement hole of the disk hub to position the disk, the support spring is rotated. With the rotation about the fulcrum, the drive pin also moves in the radial direction of the hub base, and the drive pin rotates with respect to the hub base. The frictional force between the engagement hole and the drive pin decreases,
This eliminates the problem that the drive pin is caught on the side surface of the engagement hole of the disk hub during the disk positioning operation.

Further, the step of the drive pin is pressed against the edge of the guide hole by the urging force of the support spring so that the drive pin always keeps the vertical position, thereby preventing the disk from rising when the positioning of the disk is completed. And stable disk rotation can be obtained. Furthermore, instead of using a complicated leaf spring as in the related art, a simple structure such as a wire spring can be used, so that the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a disk rotation drive device according to the present invention.

FIG. 2 is a perspective view of the embodiment as viewed from above.

FIG. 3 is a perspective view of the same embodiment as viewed from below.

FIG. 4 is a longitudinal sectional view of the embodiment.

FIG. 5 is a longitudinal sectional view showing a main part of the embodiment.

FIG. 6 is a perspective view showing an example of a stopper that can be added to the embodiment.

FIG. 7 is a longitudinal sectional view showing a biasing direction of a drive pin in the embodiment.

FIG. 8 is a plan view sequentially showing a disk positioning operation of the embodiment.

FIG. 9 is a plan view sequentially showing changes in the drive pin and the support spring during the above-mentioned positioning operation.

FIG. 10 is a plan view showing a change in the support spring during the above-mentioned positioning operation.

FIG. 11 is a perspective view of another embodiment of the disk rotation drive device according to the present invention as viewed from below.

FIG. 12 is a perspective view showing a modified example of a drive pin and a support spring applicable to the present invention.

FIG. 13 is a vertical cross-sectional view showing a comparison between a problem at the time of a disk positioning operation and a modified example of the present invention that solves the problem.

FIG. 14 is a longitudinal sectional view for explaining a problem during a disk positioning operation.

FIG. 15 is a longitudinal sectional view showing still another embodiment of the disk rotation drive device according to the present invention.

FIG. 16 is a longitudinal sectional view showing still another embodiment of the disk rotation drive device according to the present invention.

[Explanation of symbols]

 2 Hub stand 5 Drive pin 6 Guide hole 7 Large diameter portion 8 Groove 9 Pin as fulcrum 10 Support spring 11 One end of support spring 15 Disk hub 17 Engagement hole 30 Disk

Claims (3)

(57) [Claims] 1. A hub base, a drive pin protruding from the hub base and engaging with an engagement hole of a disk hub mounted on the hub base to perform positioning of the disk and rotational drive of the disk, and the drive pin. in the disk rotation driving apparatus comprising a support spring for energizing said drive pin is formed in a stepped cylindrical shape, the large diameter portion
An engagement portion is provided on the end surface, and the drive pin supports the engagement portion.
By the engagement of the holding spring, the rotation with respect to the support spring is restricted, and the disk can be moved in the radial direction.
And Tsu, the support spring, the drive pin while rotating around the fulcrum
A disk rotation drive device for biasing in a disk radial direction . 2. A magnet attached to the hub base.
The drive pin has a drive pin that can be moved in the radial direction of the disc.
Guide holes are provided for guiding
The step of the drive pin is pressed against the part by the urging force of the support spring.
2. The disk rotation drive device according to claim 1, wherein 3. The driving pin is rotatable with respect to a hub base.
3. The disk according to claim 1, wherein
Rotation drive.