JP2589077B2 - Rotary drive device for disk-shaped rotating body - Google Patents

Description

The present invention relates to a rotary driving device for a disk-shaped rotating body, and more particularly to an improvement in a rotary driving device suitable for driving a 3.5-inch floppy disk or the like.

(B) Conventional technology Conventionally, as a rotary driving device of this type, as shown in FIG. 6, a driving hub 3 is attached to a distal end portion of a rotating shaft 1 of a motor, and the driving hub 3 is It has a configuration in which the position regulating pin 7 is supported, and the position regulating pin 7 projects from an insertion hole 9 formed in the drive hub 3.

Then, when the floppy disk 11 is loaded, the rotating shaft 1 initially has the square chucking hole 15 formed in the disk-shaped metal hub 13 of the floppy disk 11 as shown in FIG. 7A.
Then, the position regulating pin 7 comes into contact with the metal hub 13, and then the drive hub 3 rotates to form the position regulating pin 7 at a position eccentric from the rotating shaft 1 of the metal hub 13 as shown in FIG. Fit into the rectangular positioning hole 17 thus formed.

Further, as shown in FIG.
17 fits into the corner and the rotating shaft 1
And the metal hub 13 is held by the position regulating pin 7 and the rotating shaft 1 while being rotated by a magnet piece (not shown) arranged on the drive hub 3 while attracting the metal hub 13. Is what you do. Reference numeral 19 denotes a flexible magnetic recording medium attached to the metal hub 13.

The space between the rotating shaft 1 and the position regulating pin 7 is a chucking hole.
Since the distance between the positioning pin 17 and the positioning hole 17 is wider, when the positioning pin 7 fits into the corner of the positioning hole 17, the tip of the positioning pin 7 is tilted in the direction of the rotation axis 1. The hub 13 is urged and held in the centrifugal direction opposite to the rotating shaft 1.

Therefore, in the above-described rotary driving device, the position regulating pin 7 easily acts to push the metal hub 13 obliquely upward, and if the attraction force of the magnet piece is weak (there is no magnet piece near the positioning hole 17, so that it is weak). 8), the floppy disk 11 is held obliquely as shown in FIG. 8, and the contact of the head (not shown) with the magnetic recording medium 19 becomes unstable, which may cause a recording / reproducing error.

Therefore, as means for solving the problem, for example,
A technique as described in JP-A-95757 is disclosed.

That is, as shown in FIG. 9, the position regulating pin 7 is supported so as to be inclined outward, and when the floppy disk 11 is loaded, the contact surface of the position regulating pin 7 with the metal hub 13 is perpendicular to the disk surface. The position regulating pin 7 is set so as to be as shown in FIG.

(C) Problems to be Solved by the Invention However, in such a configuration, since the position restricting pins 7 are supported obliquely in advance, there is a concern that they are difficult to fit into the positioning holes 17.

For example, when the leaf spring 5 is weak, only the leading edge is incompletely engaged with the positioning hole 17 of the metal hub 13 obliquely because the position regulating pin 7 is inclined as shown in FIG. It is easy to be rotationally driven in a state.

Conversely, when the leaf spring 5 is strong, the floppy disk 11 may rise while only the leading edge is engaged as shown in FIG.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional drawback, in which a positioning pin is easily inserted into a positioning hole of a disk-shaped rotating body, and the disk-shaped rotating body after positioning does not tilt. It is an object of the present invention to provide a rotary drive device that is stably held in the rotary drive.

(D) Means for Solving the Problems In order to solve such problems, the present invention is directed to a chucking hole 59 and a positioning hole as shown in FIGS. 1A and 1B and FIGS. This is a rotation drive device for rotating a disk-shaped rotating body 55 having a metal hub 57 provided with 61. That is, the drive hub 23 is attached to the rotating shaft 21 that fits into the chucking hole 59, and the leaf spring 33 supported in the middle of the lower surface of the drive hub 23 is located below the insertion hole 27 formed in the drive hub 23. And a locking member 39 that extends to the peripheral edge of the drive hub 23 and locks the distal end of the leaf spring 33 at the peripheral edge thereof, and protrudes into the positioning hole 61 via the insertion hole 27 to fit. The position regulating pin 37 is supported by the plate spring 33 so as to be inclined away from the rotating shaft 21, and a chucking magnet 29 for attracting the metal hub 57 is attached to the drive hub 23.

In the leaf spring 33, an auxiliary pin 51 is erected near the rotary shaft 21 so as to fit into the positioning hole 61 together with the position restricting pin 37, and the auxiliary pin 51 protrudes higher than the position restricting pin 37. .

(E) Action The present invention provided with such means provides a disk-shaped rotating body.
When 55 is loaded, the metal hub 57 is attracted by the chucking magnet 29 and placed on the drive hub 23, and the rotating shaft 21 fits into the chucking hole 59, while the auxiliary pin 51 is moved to the position regulating pin 37. Since it protrudes higher, the metal hub 57 pushes down the auxiliary pin 51.

Since the leaf spring 33 is locked by the locking member 39 at the peripheral edge of the drive hub 23, the leaf spring 33 curves so that the support portion of the position control pin 37 is lowered, and the position control pin 37 is vertical or close to it. Displace to state.

Therefore, when the drive hub 23 rotates and the auxiliary pin 51 fits in the positioning hole 61, the position regulating pin 37 is fitted in the positioning hole 61 in a state where the position regulating pin 37 is vertical or close thereto, and then attempts to return to the original state.

(F) Examples Examples of the present invention will be described below.

FIG. 1 is a longitudinal sectional view showing one embodiment of a rotation driving device for a disk-shaped rotating body according to the present invention.

In the figure, a flat disk-shaped drive hub 23 is attached to the tip of the rotating shaft 21 of the motor not shown,
An annular concave groove 25 surrounding the rotary shaft 21 and an insertion hole 27 passing through the concave groove 25 are formed in the drive hub 23 at the distal end side of the rotary shaft 21.

In the concave groove 25, a ring-shaped magnet piece 29 partially cut away is arranged so that the cutout portion 31 is positioned in the insertion hole 27.

On the lower surface of the drive hub 23, a leaf spring 33 extending in a V shape is attached. The leaf spring 33 traverses the lower portion of the insertion hole 27 from the peripheral edge of the drive hub 23 and is fixed to the drive hub 23 with a pin 35 obliquely behind the rotation shaft 21 as viewed from the insertion hole 27 through the vicinity of the rotation shaft 21. Have been.

A position regulating pin 37 is mounted at a position aligned with the insertion hole 27 of the leaf spring 33, and is inserted into the insertion hole 27 and protrudes upward. Since the leaf spring 33 is slightly bent in the middle and the insertion hole 27 side is inclined below the drive hub 23, the position regulating pin 37 is inclined such that the tip of the leaf spring 33 is away from the rotary shaft 21. It is supported by.

One end of a locking piece 39 is fixed to the peripheral surface of the drive hub 23. The locking piece 39 hangs down and its tip is bent into an L-shape inside the drive hub 23, and a leaf spring 33 is provided inside the bent portion 41. Are abutted and locked.

The upper portion of the position regulating pin 37 is thin, and the outer ring 47 is fitted to the inner ring 43 via a ball 45 to form a ball bearing 49.

On the opposite side of the leaf spring 33 from one end of the leaf spring 33 with the position regulating pin 37 interposed therebetween, an auxiliary pin 51 made of synthetic resin projecting higher than the position regulating pin 37 is provided upright. Together with the position regulating pin 37 so as to fit into a positioning hole 61 of the floppy disk 55 described later.
Is set up near.

A disk-shaped sliding plate 53 made of Teflon-based resin is adhered to the inside of the magnet piece 29 on the upper surface side of the drive hub 23.

When the floppy disk 55 is loaded in such a rotary drive device of the present invention, as shown in FIGS. 2A and 2B, the chucking hole 59 formed in the metal hub 57 of the floppy disk 55 is rotated. The metal hub 57 is mounted on the slide plate 53 in a state where the metal hub 57 is attracted by the magnet 29.

In this case, the metal hub 57 abuts on the auxiliary pin 51 longer than the position regulating pin 37 and pushes down the auxiliary pin 51.
Since the tip of 33 is locked by the locking piece 39 at the periphery of the drive hub 23, the leaf spring 33 is bent and deformed so that the auxiliary pin 51, that is, the supporting portion of the position control pin 37, is lowered, and the position control is performed. The pin 37 is displaced vertically or close to it.

Then, the drive hub 23 rotates while the sliding plate 53 and the metal hub 57 slide, and the position regulating pin 37 is located immediately below the positioning hole 61 as shown in FIG.
The auxiliary pin 51 is brought into contact with the metal hub 57
When it is fitted into the positioning hole 61, the position regulating pin 37 also
(See FIG. 4). At this time, the position regulating pin 37 easily fits in a state of being vertical or close to it.

Since the ball bearing 49 is formed on the upper part of the position regulating pin 37, when the upper side surface of the position regulating pin 37 hits the positioning hole 61, the outer ring 47 of the ball bearing 49 rotates to make the position regulating pin 37 extremely easy. It is moved to the corner of the positioning hole 61 and settled, and the position regulating pin 37 is urged toward the rotating shaft 21 and positioned as in the conventional example.

Therefore, as shown in FIGS. 4A and 4B, in the positioned state, the position regulating pin 37 comes into contact with the positioning hole 61 so as to press the metal hub 57 horizontally or downward. It is held in a state of being urged horizontally or downward by the pin 37.

In the present invention, the ball bearing 49 formed at the tip of the position regulating pin 37 is not essential, but
When the ball bearing 49 is formed on the upper part of the position, the position regulating pin 37 moves extremely easily after fitting into the positioning hole 61,
There is an advantage that positioning can be performed more easily. However, the ball bearing may be formed separately and attached to the head of the position regulating pin 37.

The support structure of the position regulating pin 37 to the drive hub 23 is as follows.
It is not limited to the example described above.

 Further, the shape of the leaf spring 33 is also arbitrary.

(G) Effect of the Invention As described above, the rotary driving device for a disk-shaped rotating body according to the present invention includes the plate spring 33 extending below the insertion hole 27 and extending to the peripheral portion of the driving hub 23. Mount on the bottom,
At the peripheral portion of the drive hub 23, a leaf spring 33 is
And the position regulating pin 37 is tilted so that its tip is separated from the rotating shaft 21 and is supported by the leaf spring 33.
The auxiliary pin 51 is erected so as to fit into the positioning hole 61 of the disc-shaped rotating body 55 together with the position regulating pin 37, and the auxiliary pin 51 is projected higher than the position regulating pin 37, so that the disc-shaped rotating body 55 is loaded. Then, the drive hub 23 rotates, the auxiliary pin 51 fits into the positioning hole 61, and the position regulating pin 37 fits easily and securely into the positioning hole 61 with the position at or near the vertical position, and the disk-shaped rotating body 55 rises Nothing.

Further, since the disk-shaped rotary body 55 is held in a state where it is urged horizontally or downward by the position regulating pin 37, the disk-shaped rotary body 55 does not tilt even in the holding state.

Therefore, errors in writing to the disk-shaped rotator 55 and reading from the disk-shaped rotator 55 are eliminated.

[Brief description of the drawings]

1A and 1B are a plan view showing an embodiment of a rotary driving device for a disk-shaped rotating body according to the present invention and BB in A.
FIGS. 2A and 2B through FIGS. 5A and 5B are the first sectional views, respectively.
FIG. 3 is a plan view showing a process of positioning and holding the disk-shaped rotating body in the rotary driving device shown in FIG. 7 is a longitudinal sectional view showing a conventional rotary driving device. FIGS. 7A to 7C are diagrams for explaining the rotary driving device from when a disk-shaped rotary body is loaded to when it is positioned and held. FIG. FIG. 9 is a longitudinal sectional view showing an example in which a disk-shaped rotating body is held in an undesired state in a rotary driving device, FIG. 9 is a longitudinal sectional view showing another conventional rotary driving device, and FIGS. FIG. 10 is a schematic diagram illustrating an operation example of the rotary drive device of FIG. 9. 1, 21 ... rotating shaft, 3, 23 ... drive hub, 5, 33 ... leaf spring, 7, 37 ... position regulating pin, 9, 27 ... insertion hole, 1
1, 55 ... Disk-shaped rotating body (floppy disk), 1
3, 57 ... metal hub, 15, 59 ... chucking hole, 1
7, 61 positioning holes, 19 magnetic recording medium, 29 magnet pieces, 39 locking members (locking pieces), 49 ball bearings, 51 auxiliary pins, 53 sliding plates .

Claims (1)

(57) [Claims] A rotating shaft fitted in a chucking hole provided in a metal hub of the disk-shaped rotating body; a driving hub mounted on the rotating shaft; and a chuck mounted on the driving hub and sucking the metal hub. A king magnet; a leaf spring supported by a lower surface of the drive hub and extending to a peripheral portion of the drive hub through a lower side of an insertion hole formed in the drive hub; and a leaf spring at the peripheral portion. A locking member that stops, a position regulating pin that is supported by the leaf spring at an angle away from the rotating shaft and that protrudes and fits through a through hole in a positioning hole formed in the metal hub; An auxiliary pin that is erected on the leaf spring in the vicinity of the restriction pin, fits into the positioning hole together with the position restriction pin, and protrudes from the position restriction pin. The rotation drive device for a disk-shaped rotating body, wherein the plate spring is engaged with the engagement member and the position regulating pin is fitted into the positioning hole in a substantially vertical state.