JPH0427005Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention is a disk rotation drive in which a drive pin is engaged with an engagement hole formed in a disk as an information recording medium to rotationally drive the disk. Regarding equipment.

(Prior art) A drive pin is provided on a hub base that is rotationally driven by a motor, and the drive pin is inserted into an engagement hole formed at a position eccentric to the center of a disk serving as an information recording medium such as a magnetic disk. A disk rotation drive device is known in which a disk is rotated by engagement with the disk.

In such a disk rotation drive device, it is necessary to position the disk at a fixed position on the hub stand and drive the disk rotationally. The position of the disk is determined by FIG. 5 shows this disk positioning means. In FIG. 5, reference numeral 5 denotes a disc hub at the center of the disc (not shown), and this disc hub 5 has a square hole 5a in the center and a rectangular engagement hole 5b at a position offset from the center. have When the disk hub 5 is placed on the hub stand, the spindle 4 fits into the square hole 5b, and the drive pin 3 engages with the engagement hole 5b. The drive pin 3 is mounted on a leaf spring and is biased radially outward by the leaf spring, and this biasing force becomes a positioning force I, pushing the disk hub 5 radially outward of the hub base. The two sides a of the square hole 5a,
The two points b are brought into contact with the spindle 4, thereby positioning the disk. As the hub stand is rotationally driven in this state, the disk hub 5 and the disk integrated therewith are rotationally driven by the drive pin 3.

In the above-described disk positioning means, when the disk hub 5 is placed on the hub stand, if the edge of the engagement hole 5b of the disk hub 5 happens to ride on the drive pin 3, the drive pin 3 will move away from the disk. The disk may get caught on the edge of the engagement hole 5b while being tilted outward in the radial direction, and the disk may be rotated with incomplete chucking. In this state, the positioning of the disk is incomplete, and the drive pin 3 may come off from the engagement hole 5b during rotation of the disk.

Therefore, the present applicant previously filed an application for utility model registration for a disk rotation drive device that solved the above problems (Utility Model Application No.
No. 57348)). FIG. 6 shows an example of the disk rotation drive device according to the above application. In FIG. 6, a hub stand 6 is press-fitted into the spindle 4, and a ring-shaped chucking magnet 2 is installed inside the hub stand 6.
is embedded. A disk hub 5 made of a magnetic material is placed on the hub stand 6, and a magnet 2 attracts the disk hub 5 to hold the disk hub 5 on a predetermined chucking surface.
A leaf spring 8 is attached to the lower surface of the hub stand 6 with a fixing screw 13, and a drive pin support shaft 7 is fixedly planted on the leaf spring 8. The shaft 7 stands up through the escape hole of the hub base 6, and the drive pin 3 is attached to the upper end of the shaft 7. The upper end surface of the drive pin 3 is located above the above-mentioned chucking surface of the disk hub 5. An inclination adjusting member 10 such as a spacer is interposed between the hub stand 6 and the tip of the leaf spring 8, so that the leaf spring 8 is tilted relative to the direction of rotation of the disk indicated by the arrow. The front side of the drive pin 3 is tilted downward. A stopper 12 stands up behind the drive pin 3. The stopper 12 is formed by a part of the yoke 11 arranged at the inner bottom of the hub stand 6.

Now, even if the disk hub 5 is placed on the chucking surface on the hub stand 6 and the edge of the engagement hole 5b of the disk hub 5 happens to ride on the drive pin 3, the drive pin 3 will not move. Since the support shaft 7 is tilted so that the front side is lowered with respect to the rotation direction of the disk, when the drive pin rotates together with the hub stand 6, the drive pin 3 slips under the disk hub 5, and thus the drive pin 3 The edge of the engagement hole 5b of the disc hub will not rotate while being caught. When the drive pin 3 comes to the position of the engagement hole 5b of the disk hub 5 as the hub base rotates, the drive pin 3 engages in the normal position of the engagement hole 5b due to the biasing force of the leaf spring 8. The biasing force of the leaf spring 8 becomes a positioning force, and the disk is positioned as described above.

(Problem to be Solved by the Invention) As described above, according to the disk rotation drive device according to the above application, the positioning of the disk hub on the hub stand is achieved by tilting the drive pin forward with respect to the rotation direction of the disk. This has the effect that it can be performed reliably.

The present invention further improves the disk rotation drive device according to the above application, eliminates the need to adjust the inclination angle of the drive pin that rotationally drives the disk, and stabilizes this inclination angle to eliminate variations in the disk rotation. To provide a disk rotation drive device capable of increasing chucking position accuracy and increasing the stability of disk rotation by stabilizing the gap dimension between a drive pin and a stopper regulating its position. The purpose is to

(Means for solving the problem) The present invention is to attach a drive pin to a flat leaf spring, provide an inclined surface part on the hub stand to which this leaf spring is attached, and abut the said leaf spring on this inclined surface part. The drive pin is characterized in that the drive pin is inclined so that the front side thereof is lowered with respect to the direction of rotation of the disk.

(Function) By mounting the plate spring with the drive pin in contact with the inclined surface part provided on the hub stand, the drive pin is tilted forward and downward with respect to the disk rotation direction, so the inclination angle of the drive pin is the same as that of the hub. Determined by the angle of the inclined surface of the table. Since the inclination angle of the hub stand is determined uniformly, a stable inclination angle without variation can be obtained, and the gap dimension between the drive pin and the stopper regulating its position is also stabilized.

(Embodiment) In FIGS. 1 to 3, a shaft hole of a flat bottomed cylindrical hub stand 22 is press-fitted into a spindle 21 which is rotationally driven by a spindle motor. The hub stand 22 is made of, for example, resin with a low coefficient of friction. Inside the hub stand 22 is a ring-shaped chucking magnet 23 whose upper surface side is connected to the hub stand 22.
It is embedded so that it is exposed from the inside. As the magnet 23, for example, a plastic magnet or a sintered magnet can be used. An outward facing flange 32 is formed on the boss 38 of the hub stand 22, and this flange 32 is connected to the inner peripheral edge 3 of the magnet 23.
By covering the two parts, the magnet 23 is prevented from coming off, and the strength of attaching the magnet 23 to the hub stand 22 is strengthened. The upper surface 35 of the boss portion 38 of the hub stand 22 serves as a mounting reference surface for a disk hub (not shown), and when embedding the magnet 23, the upper surface 35 of the boss portion 38 of the hub stand 22 and the upper surface 35 of the magnet 23 The upper surface 36 is used as a reference surface, and the upper surface 36 is integrally molded so that a predetermined step D is created between these reference surfaces 35 and 36. This step D affects the attraction force of the disk hub by the magnet 23, and an accurate step dimension is required to obtain a preferable chucking force. However, in the example shown in FIG.
Since the height difference D is determined by stacking magnets 1 and 2, the tolerances of these parts are accumulated, resulting in large variations in the height difference D. In contrast, the first
In the embodiment of FIGS. 3 to 3, two reference planes 35,
The step D is directly set by 36, and the hub stand 2
Since the magnet 2 and the magnet 23 are molded, the dimensional accuracy of the step D can be improved, and a desirable chucking force can be stably obtained.

An inclined surface portion 37 having a predetermined inclination angle θ is formed on the lower surface of the hub stand 22 , and a flat leaf spring 26 is abutted along this inclined surface portion 37 . Part of 26 is hub stand 2
It is fixed at 2. The leaf spring 26 is made asymmetrically and has a portion with a large spring constant and a portion with a small spring constant.The portion with a large spring constant is attached to the hub base 22 by a fixing screw 28, and the tongue-shaped portion with a small spring constant A drive pin support shaft 25 is fixedly planted at 39. The shaft 25 stands up through an escape hole 27 formed at a position eccentric from the position of the spindle 21, which is the center of rotation of the hub stand 22, and a drive pin 24 is attached to the upper end of the shaft 25.
Therefore, the drive pin 24 can swing in the axial direction, circumferential direction, and radial direction of the hub stand 22 by the bending of the leaf spring 26. The upper end surface of the drive pin 24 is located above the chuck reference surface 35 of the disk hub. Therefore, when the disk hub is placed on the chuck reference surface 35, the drive pin 24 is pushed by the disk hub and the leaf spring 26 is bent. At this time, the tongue-shaped portion 39 of the leaf spring 26 is bent, urging the drive pin 24 radially outward of the disk hub to apply the positioning force. The drive pin 24 can be formed of a ball bearing, for example. In this case, the inner ring of the ball bearing is press-fitted onto the shaft 25, and the outer ring of the ball bearing is fixed to the disk hub 5 (see FIG. 5).
It is made to engage with the engagement hole 5b of. Leaf spring 2
Since the entire drive pin 6 is inclined at an angle θ along the inclined surface portion 37 of the hub stand 22, the drive pin 24 supported on the leaf spring 26 via the support shaft 25 is also inclined at the angle θ. The direction of the inclination of the drive pin 24 is such that the direction of the inclination of the inclined surface portion 37 of the hub stand 22 is such that the front side is downward relative to the direction of rotation of the disk shown by the arrow in FIGS. 1 and 2. Set. It is sufficient that the hub stand 22 and the inclined surface part 37 are formed at least in the range where the leaf spring 26 contacts or in the part where the leaf spring 26 is attached in contact with each other, but the entire lower surface of the hub stand 22 may be formed as an inclined surface part.

A part of the edge 32 of the escape hole 27 of the hub stand 22 projects toward the drive pin 24 on the rear side with respect to the rotational direction of the disk, and serves as a stopper 33 . Surface 3 of stopper 33 facing drive pin 24
Similar to the drive pin 24, the gap 4 is inclined by an angle θ, and a gap having a uniform dimension t is formed between the drive pin 24 and the drive pin 24.

Now, even if the disk hub is placed on the tracking surface 35 and the edge of the engagement hole 5b (see FIG. 5) of the disk hub happens to ride on the drive pin 24, the drive pin 24 will be tilted at an angle θ. Since the front side is lowered with respect to the rotating direction of the disk, the drive pin 24 is tilted with the hub stand 22.
When the drive pin 24 rotates, the drive pin 24 slips under the disc hub while bending the leaf spring 26, so that the drive pin 24 rotates with the edge of the engagement hole 5b of the disc hub hooked to the drive pin 24. Never. When the drive pin 24 rotates and comes to the position of the engagement hole 5b of the disk hub, the drive pin 24 engages the leaf spring 2.
Due to the biasing force based on the deflection of the plate spring 2, the plate spring 2 is engaged in the proper position of the engagement hole 5b of the disk hub.
The drive pin 24 tends to swing outward in the radial direction of the disk due to the biasing force No. 6, and this acts as a positioning force to position the disk.

When a load is applied to the drive pin 24 and the pin 24 tends to fall down, the drive pin 24 comes into contact with the regulating surface 34 of the stopper 33 to prevent the drive pin 24 from falling down. In the above embodiment, since the regulating surface 34 of the stopper 33 faces the drive pin 24 in parallel, the tilting of the drive pin 24 is stably regulated. If the regulating surface 34 stands vertically and the surface facing the driving pin 24 is not parallel, when the regulating surface regulates the driving pin 24, the driving pin 24 swings unstably, which tends to cause index defects. Become.

According to the above embodiment, in order to incline the front side of the drive pin 24 with respect to the disk rotation direction, the leaf spring 26 to which the drive pin 24 is attached is brought into contact with the inclined surface portion 37 of the hub stand 22, and the inclination angle of the drive pin 24 is is determined by the inclination angle of the inclined surface part 37 of the hub stand 22, so the inclination angle of the drive pin 24 is fixed at a constant value simply by attaching the leaf spring 24 to the inclined surface part 37 of the hub stand 22, and there is no need to adjust the inclination angle. Even if the angle of inclination is stable, it can be obtained without any variation. Furthermore, by stabilizing the inclination angle of the drive pin 24, the gap dimension between the drive pin 24 and the stopper 33 is also stabilized, and the position where the drive pin 24 is regulated by the stopper 33 is also stabilized, thereby reducing index defects. I can do it.

In the above embodiment, the stopper 33 is integrally molded when the hub base 22 is molded, but the stopper and the hub base may be formed separately and the stopper may be attached to the hub base.
Further, although the inclined surface portion 37 of the hub stand 22 is formed when the hub stand 22 is integrally molded in the above embodiment, a member having the inclined surface portion is made separately from the hub stand, and this is attached to the hub stand. It may be fixed to the stand.

Furthermore, as shown in FIG. 4, a plurality of protrusions 43 and 44 are integrally molded on the lower surface side of the hub stand 42, and the lower surfaces 45 and 46 of these protrusions 43 and 44 are arranged in a common plane. The drive pin 24 may be tilted by making the plate springs 26 come into contact with these inclined surface portions 45 and 46.

(Effects of the invention) According to the invention, in order to tilt the drive pin forward with respect to the rotational direction of the disk in order to prevent defective positioning of the disk hub on the hub stand, an inclined surface portion is provided on the hub stand, and the drive pin Since the drive pin is made to incline by bringing the leaf spring attached to it into contact with the above-mentioned inclined surface, the inclination angle of the drive pin is uniformly determined by the angle of the inclined surface of the hub stand. There is no need to adjust the inclination angle of the pin, which greatly improves the assembly process, and since the inclination angle of the drive pin is stable,
Chucking errors caused by variations in the inclination angle of the drive pin are eliminated. Furthermore, since the inclination angle of the drive pin is uniformly set as described above and no adjustment is required, it is easy to set the gap between the drive pin and its stopper, and it is possible to prevent index defects caused by too large a cap. It can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of a disk rotation drive device according to the present invention, FIG. 2 is a sectional view taken along the line - in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line - in FIG.
FIG. 4 is a side view showing another embodiment of the disk rotation drive device according to the present invention, FIG. 5 is a plan view for explaining the positioning operation of the disk in the disk rotation drive device, and FIG. The figure is a longitudinal sectional view showing an example of a conventional disk rotation drive device. 5b...Engagement hole, 22, 42...Hub stand, 24
... Drive pin, 26 ... Leaf spring, 37, 45, 4
6...Slope section.

Claims (1)

[Scope of utility model registration request] In a disk rotation drive device that rotationally drives the disk by engaging a drive pin with an engagement hole formed at an eccentric position with respect to the center of rotation of the disk, the drive pin is attached to a flat leaf spring. In addition, the hub stand to which this leaf spring is attached is provided with an inclined surface, and by bringing the leaf spring into contact with this inclined surface, the drive pin is inclined so that the front side is lowered with respect to the rotational direction of the disk. Features a disk rotation drive device.