JPH0541011A - Disk chucking mechanism - Google Patents

Abstract

PURPOSE:To simplify the structure, to improve assemblability and to reduce the wear of a chucking lever by constituting integrally the chucking lever and a driving pin with plastic material, and making a slope of the upper surface of driving pin. CONSTITUTION:The chucking lever 135 is formed of a plastic resin and provided rotatably on a rotor 131 by a chucking lever pin 141, and at one end thereof, the driving pin part 142 is formed integrally with the lever by the plastic resin. The slope is made on the upper surface of driving pin so that the side of a rotation driving shaft 133 is lower by about 2 degrees to keep a hub surface almost parallely in contact to the upper surface of driving pin part. So, the number of parts is reduced without using a conventional spring and also the assembling process is made easy. Also, the probability that the driving pin part 142 coincides with a driving hole is increased, and the contact between the upper surface of driving pin and lower surface of hub is decreased, then the wear of the surface of hub plate can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk chucking mechanism for a flexible disk drive device.

[0002]

2. Description of the Related Art The conventional technique is as follows.
As shown in FIGS. 7, 8, and 9 and 10, the rotary plate mounted on the rotary drive shaft 1 engaging with the central hole of the hub 7 and rotating integrally with the rotary drive shaft 1. The chucking lever 3 is attached to the chucking lever 2, and a drive pin 5 that engages with a drive hole 7a provided at a position eccentric from the center of the hub 7 at one end of the chucking lever 3 is provided in the rotary plate 2 with a positioning hole 2a. The chucking lever 3 is attached to the chucking lever 3 so that the drive pin 5 can be moved toward the rotation direction of the rotary plate 2 from the outer peripheral side to the inner peripheral side of the rotary plate 2. It has been known that the drive pin 5 is provided with a spring 8 for axially urging the drive pin 5. 7 is a plan view of a conventional disk chucking mechanism, FIG. 8 is a sectional view of the conventional disk chucking mechanism, and FIG. 9 is a rear view of FIG. In FIGS. 7 and 9, the disk 6 and the hub 7 are indicated by alternate long and short dash lines to facilitate understanding of the drawings. FIG. 10 is a schematic sectional view of the drive pin portion.

[0003]

However, in the above-mentioned prior art, the number of parts is increased when the chucking mechanism is constructed, and therefore the assembly process is not easy. Further, due to the pressure of the spring 8 that biases the chucking lever 3 during chucking, a frictional force is generated at the pivotal fulcrum of the chucking lever 3, and a variation of this frictional force is absorbed by the chucking lever spring 9. The spring pressure had to be kept within a certain standard, and it was necessary to adjust the spring pressure.

Further, when a hub is mounted on the chucking mechanism, the probability that the drive hole and the drive pin coincide with each other during chucking is small, and the hub rides on the drive pin and the rotary plate does not rotate once. In some cases, the drive pin does not go into the drive hole, and at the time of its rotation, one point on the top surface of the drive pin contacts the bottom surface of the hub, causing friction, and because the drive pin is made of metal by cutting, that part However, there is a problem in that the magnetic particles are easily worn and magnetic particles are easily generated, and the magnetic particles adhere to the recording / reproducing portion and seriously affect the device.

Therefore, the present invention has been made in order to solve the above problems of the prior art, and simplifies the chucking mechanism, without adjusting the spring pressure of the chucking mechanism, and facilitates the assembly process. The purpose of this is to improve the reliability of the recording / reproducing apparatus by reducing the wear at the time of chucking and chucking.

[0006]

In order to solve the above problems, the disk chucking mechanism of the present invention has a central hole of a metallic hub fixed to the central portion of a disk housed in a hard case. A rotary drive shaft to be engaged, a rotary plate fixed to the rotary drive shaft, and a drive pin projectingly engaged in a substantially square drive hole provided at a position eccentric from the center of the hub and having a sloped surface on the upper surface. A part at one end and the other end rotatably attached to the rotary plate by a rotary fulcrum structure, and freely rotatable about a predetermined angle around the rotary fulcrum structure, and It is characterized by comprising a chucking lever whose movement is restricted in the rotational drive axis direction.

[0007]

According to the above construction of the present invention, the contact surface between the hub surface and the drive pin portion during chucking is widened by inclining the upper surface of the drive pin portion provided on the chucking lever, and wear is reduced. Further, by making the chucking lever and the drive pin into an integrated structure, the chucking mechanism can be simplified and adjustments are unnecessary, and a more reliable chucking mechanism can be provided.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic plan view of a spindle motor and a disk chucking mechanism according to the present invention.
5 and 6 are plan views in which a hub is mounted on the disk chucking mechanism of FIG. In FIG. 1, the hatched portion of the chucking magnet 130 is magnetized. The suction force of the hub 7 is uniform with respect to the center of the rotary drive shaft 133. A chucking lever 135 made of plastic resin is rotatably fixed on the rotor 131 by a chucking lever pin 141. The drive pin 1 is provided at one end of the chucking lever 135.
42 is configured. The chucking lever 135 is
It is arranged in a hole provided in the chucking magnet 130, and a part of the hole is also provided with a hole 131d in the rotor 131. 2, 3, and 4 are cross-sectional views of the disk chucking mechanism, showing the case where the hub 7 attached to the disk is mounted from the upper part of the drawing. As shown in FIG. 2, the hub 7 is attracted by the chucking magnet 130. At this time, the probability that the positional relationship between the drive hole 7a provided in the hub 7 and the drive pin portion 142 will match is small. As shown in FIG. 3, the hub 7 corresponds to the drive pin portion 142, but since the drive pin portion 142 upper surface 142a is inclined, the hub 7 contacts the drive pin portion 142 upper surface 142a substantially in parallel. In that state, the rotor 131 is rotated by the motor rotation signal. As a result, the drive hole 7a of the hub 7 and the hub 7 are set flat on the pedestal top surface 137 as shown in FIG. 4, and the drive pin portion 142 is pushed out into the drive hole 7a.
Further, as shown in FIG. 6, by engaging the drive pin portion 142 with the two surfaces of the drive hole 7a, 7a1 and 7a2, the chucking lever 135 is rotationally moved in the direction of arrow 143 by the rotational force of the disc. The center hole of the hub 7, the two faces of 7b, and 7b1 and 7b2 are pressed against the rotary drive shaft 133 to center the hub 7.

The inclination of the upper surface 142a of the drive pin portion 142 is
The rotation drive shaft 133 side is provided so as to be lowered by about 2 degrees. Therefore, when the hub 7 is mounted on the chucking mechanism, the contact area between the upper surface 142a of the drive pin portion 142 and the hub surface of the hub 7 is wider than in the conventional case. Furthermore, if the drive pin is made of metal, if the hub contacts the drive pin only partially, the amount of partial wear will be large, and both the lower surface of the metallic hub and the drive pin will be scraped off, and magnetic particles will come out, which will be recorded. Jumps to the playback part and seriously affects the device. However, in the present embodiment, since the chucking lever is made of plastic resin, there is no such concern, and even if plastic powder flies, it does not affect the recording / reproducing apparatus.
Further, by sloping the upper surface of the drive pin portion, wear can be prevented, and by increasing the contact area, durability can be improved. According to the experiment, the optimum inclination of the upper surface of the drive pin is 2 ° ± 1.5 °.

Further, when the hub 7 is driven by the drive pin portion 142 in FIG. 4, a force is applied in the direction of arrow 160 in the figure. Due to this force, the drive pin portion 142 tries to move in the direction of the chucking lever 135 and the arrow 161 in the figure. However, the chucking lever 135 does not move in the direction of the arrow 161 in the drawing because the hatched portion in the drawing is in contact with the rotor 131. Further, the chucking mechanism has a hub 7
When the drive pin portion 142 is pushed by the hub surface of the hub 7 and a force is applied in the direction of the arrow 162 in the drawing to move, the drive pin portion 142 engages with the rotor 131 to prevent the sinking prevention portion 165. And the drive pin portion 142
Are prevented from moving in the direction of arrow 162 in the figure.

Thrust movement amount of drive pin (arrow 16 in the figure)
If the direction (1, 162) is large, the drive position of the hub 7 will change. This causes misalignment in the rotational direction among the important characteristics required for the chucking mechanism of the flexible disk drive, and has an important influence on the compatibility of the flexible disk drive. Further, when the drive pin portion 142 rises, the hub 7 also rises at the same time, and the hub 7 that should be sucked and stabilized on the pedestal upper surface 137 is in a one-sided floating state, and the contact between the disk 6 and the head (not shown) is not possible. It will be stable and will adversely affect the recording and reproduction of signals. It should be noted that the operating range of the chucking lever 135 is restricted by the inner walls 131d1 and 131d2 of the hole 131d provided in the rotor 131 as shown in FIG. 1 so that the drive hole 7a and the drive pin portion 142 are securely engaged. There is.

Conventionally, in the method of urging the chucking lever with a spring, the accuracy of the spring pressure is required so that the spring pressure is always within the standard. However, in the present embodiment, since the spring is not used and the chucking mechanism is configured only by the chucking lever and the drive pin portion formed at one end thereof, the spring adjustment is not necessary. At the same time, since the chucking lever of this embodiment is made of plastic resin, it is easy to handle, and the chucking lever pin 141 is attached to the back of the rotor (shown by broken lines) as shown in FIG.
Workability is good because it is only necessary to fit the bearing portion 143 into the bearing.

The drive pin portion 142 that contacts the hub 7
Since the portion is made of plastic resin, the hub 7 is less likely to be damaged, the torque cross due to the sliding of the hub 7 and the drive pin portion 142 at the time of starting the rotation of the motor is small, and there is no fear of damage to the lower surface of the hub 7. Further, since the chucking lever and the drive pin portion are made of plastic resin so as to be integrated, the number of parts is reduced and the assembling process can be simplified.

[0015]

As described above, in the disk chucking mechanism of the present invention, the drive pin portion is formed at one end of the chucking lever made of plastic resin, and the media hub is placed on the upper surface of the drive pin portion. In this case, by sloping the drive pin upper surface so that the hub surface and the drive pin upper surface contact substantially parallel to each other and enlarging the contact area, the effect of preventing the wear of the drive pin section and the hub lower surface can be obtained. The structure that the chucking lever does not move up and down due to the engagement with the rotary plate can prevent the accuracy of the positioning in the rotational direction from being deteriorated due to the thrust rattle of the drive pin, reduce the number of parts of the chucking mechanism, and simplify the assembly process. It has the advantages of no adjustment of springs, improved workability, etc., which leads to further cost reduction and eliminates unstable factors such as adjustment, etc. There is a large effect that leads to improved.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a spindle motor and a disk chucking mechanism according to the present invention.

FIG. 2 is a sectional view of a disk chucking mechanism according to the present invention.

FIG. 3 is a sectional view of a disk chucking mechanism according to the present invention.

FIG. 4 is a sectional view of a disk chucking mechanism according to the present invention.

FIG. 5 is a schematic plan view of a spindle motor and a disk chucking mechanism according to the present invention.

FIG. 6 is a schematic plan view of a spindle motor and a disk chucking mechanism according to the present invention.

FIG. 7 is a plan view of a conventional disk chucking mechanism.

FIG. 8 is a sectional view of a conventional disk chucking mechanism.

9 is a rear view of FIG. 7. FIG.

FIG. 10 is a schematic sectional view of a drive pin portion of a conventional disc chucking mechanism.

[Explanation of symbols]

 7 hub 7a drive hole 130 chucking magnet 131 rotor 131d rotor hole 133 rotary drive shaft 135 chucking lever 137 cradle top surface 141 chucking lever pin 142 drive pin portion 142a drive pin portion top surface 165 sunken prevention portion

Claims (3)

[Claims] 1. A rotary drive shaft engaging with a central hole of a metal hub fixed to the center of a disk housed in a hard case, a rotary plate fixed to the rotary drive shaft, and the hub. The drive pin part is projectingly engaged in a drive hole of a substantially quadratic shape provided at a position eccentric from the center of the drive shaft, and the drive pin portion having an inclined surface on the upper surface is formed at one end, and the other end is rotated on the rotary plate by a rotation fulcrum structure. A chucking lever which is movably attached, is configured to be freely rotatable about the rotation fulcrum structure by a predetermined angle, and is restricted from moving in the rotation drive axis direction. Disc chucking mechanism. 2. When the hub is placed on the upper surface of the drive pin of the chucking mechanism, the upper surface of the drive pin and the hub surface are in contact with each other substantially parallel to each other. Disc chucking mechanism. 3. The disk chucking mechanism according to claim 1, wherein the drive pin portion is made of plastic resin.