JPH05334780A - Rotary driving device - Google Patents

Abstract

PURPOSE:To make the device belted in shape and to surely position a hub by constituting a driving shaft so that is does not inclined in the state that the hub of a disk is positioned to a turn-table. CONSTITUTION:When a hub 40 fixed to the central part of a floppy disk 50 is mounted on a turn-table 23 and rotated in the direction of arrow R, a driving shaft 29 is crimped by the short side 42a of a driving shaft inserting hole 42 and a controlling side 23d in an inserting hole 23b and the hub 40 is positioned at this time, since the long side 42b of the inserting hole 42 is formed so that its distance from a central hole 41 becomes short as the hub 40 is rotated, a shaft 29 is moved along this long side 42b toward a central shaft 27 side, that is, a radial direction. As it is moved, a driving shaft supporting board 25 is moved in the radial direction and in the direction that the shaft 29 is moved near the shaft 27. At this time, A wire spring part 25a formed on the supporting board 25 is abutted on the shaft part 36a of an engaging pin 36 and deflected and the energizing force of a radial direction is given to the supporting board 25 and the shaft 29.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary drive device for a disk-shaped rotating body such as a floppy disk.

[0002]

2. Description of the Related Art Conventionally, as a magnetic storage medium, it is well known that a thin film magnetic disk is provided with a metal hub for positioning the disk in a drive unit for rotating the disk. (For example, JP-A-5
7-36473). An example of a drive device for rotating this type of disk will be described with reference to FIG.

FIG. 6 shows a main part of a conventional rotary drive device (hereinafter, referred to as
FIG. 6 (A) is a plan view seen from the surface side on which the disc is placed, FIG. 6 (B) is a longitudinal sectional view thereof, and FIG. 6 (C) is FIG. It is the top view seen from the back surface side of A). In these figures, a disk-shaped turntable (3) is fixed to a central shaft (7), and this turntable (3) has a mounting surface (3a) on which a hub of a disc described later is mounted, It has an attracting surface (3b) magnetized to a predetermined number of magnetic poles to attract the hub onto the mounting surface (3a). Further, a through hole (3c) is formed at a position distant from the central axis (7) of the turntable (3) in the radial direction.

A mounting surface (3) of the turntable (3)
On the surface opposite to a), a leaf spring (5) having a substantially semi-arcuate shape is provided.
It is fixed with individual mounting pins (6) (6). A tongue portion (5a) extending from the circumferential portion toward the central axis (7) is formed at the center of the leaf spring (5), and the tongue portion (5a) is formed at the tongue portion (5a). A drive shaft (9) is attached. At this time, the drive shaft (9) is arranged so as to be loosely inserted into the through hole (3c) of the turntable (3).

In this way, the chucking (1) of the rotary drive device is constructed. An output shaft of a rotary electric motor such as a brushless motor (not shown) is directly used as the central shaft (7).

Next, the operation of this chucking (1) will be described with reference to FIG. FIG. 7 (A) is a plan view at a certain moment when the hub (10) of the disc is placed on the chucking (1), and FIG. 7 (B) is a longitudinal sectional view thereof. At this point, the central shaft (7) is inserted into the central hole (10a) of the hub (10), but the drive shaft (9)
Are pushed downward as shown in FIG. 7 (B). At this time, the drive shaft (9) is urged upward by the elastic force of the leaf spring (5).

Thereafter, the hub (10) rotates in the direction indicated by the arrow R relative to the chucking (1) (actually,
The chucking (1) rotates with respect to the hub (10), and the drive shaft (9) is inserted into the drive shaft insertion hole (10b) of the hub (10) by the restoring force of the leaf spring (5). FIG. 7C is a plan view showing the state, and FIG.
(D). In this state, the hub (10) is not yet positioned with respect to the chucking (1).

In FIG. 7 (E), the hub (10) further rotates in the direction of arrow R relative to the chucking (1) from the state of FIG. FIG. 7 is a plan view showing a state in which the hub (10) is positioned above, and a vertical sectional view thereof is FIG. 7 (F).

At this time, the drive shaft (9) is tilted inward by the long side (10d) on the outer peripheral side of the drive shaft insertion hole (10b), and the driving shaft (9) is restored by the restoring force of the bending of the leaf spring (5). A radial urging force is applied to 9) to position the hub (10). Further, the rotation direction is such that the drive shaft (9) has one short side (1) of the drive shaft insertion hole (10b) of the hub (10).
0c) and the regulation side (3d) provided in the through hole (3c) of the turntable (3), and sandwiched and positioned.

[0010]

However, in the conventional chucking (1) as described above, as shown in FIG.
As is clear from (F), when the hub (10) is positioned on the chucking (1), the drive shaft (9) is shown in FIG.
Since the positioning is performed in a state in which the drive shaft (9) is tilted downward from the position shown in (D), the drive shaft (9) is surely inserted in the drive shaft insertion hole (10b) of the hub (10). It is necessary to lengthen the axial length of the drive shaft (9) to some extent so that the vicinity of the end of () is engaged. Therefore, in FIG.
Even in the state of (B), the turntable (3) and the motor, etc. are prevented from contacting with each other such that a fixed portion (not shown) such as a motor and the tongue piece (5a) of the leaf spring (5) supporting the drive shaft (9) do not come into contact with each other. It is necessary to secure a sufficient space between the fixed portion and the fixed portion, which has been an obstacle to reducing the overall thickness of the rotary drive device.

Since the positioning force is generated when the drive shaft (9) is tilted, this positioning force is applied to the hub (1).
0) is included upwardly (in the direction of pulling it away from the turntable (3)), which has been a cause of impeding accurate positioning of the hub (10).

The present invention has been made in order to solve the problems of the conventional device as described above, and provides a rotary drive device capable of reducing the thickness of the rotary drive device and surely positioning the hub (10). Is.

[0013]

In order to solve such a problem, a rotary drive device of the present invention comprises a central shaft, a hub mounting surface fixed to the central shaft and on which a hub of a disk is mounted, and a hub mounting surface. A turntable having a through hole formed at a position distant from the central axis in the radial direction, a drive shaft support plate arranged on the surface side of the turntable opposite to the hub mounting surface, and the drive shaft support. A drive shaft supported by a plate and loosely inserted into the through hole of the turntable; and an axial urging means for urging the drive shaft support plate formed in the turntable in a direction in which the drive shaft support plate is pressed against the turntable. A rotary drive device in which a regulation side for regulating the position of the drive shaft in the rotation direction is formed in a part of the through hole of the turntable, wherein the hub is not positioned with respect to the turntable. When When the hub is positioned with respect to the turntable when the drive shaft support plate is movable in the radial direction and the rotational direction and no radial urging force acts on the drive shaft, the drive shaft support plate moves radially toward the drive shaft. Radial biasing means for applying a biasing force in the direction is formed on a part of the drive shaft support plate. The axial urging means may include an elastic member and a mounting member that attaches the elastic member to the turntable so as to apply an axial urging force to the drive shaft support plate. Further, if the turntable is made of a resin material mixed with magnetic powder and the drive shaft support plate is made of a magnetic metal plate, the axial biasing means can be a single pole or multiple poles on the turntable. It can be constituted by a magnetic attraction between the magnetized magnetic pole and the drive shaft support plate.

[0014]

According to the present invention having such means, when the hub of the disk is not positioned with respect to the turntable, the drive shaft support plate and the drive shaft supported by the drive shaft support plate are free to move in the radial and rotational directions. It is movable and is configured such that when the hub is positioned with respect to the turntable, a radial biasing force acting as a positioning force acts by the radial biasing means formed in a part of the drive shaft support plate. Since the drive shaft does not tilt, the hub is positioned on the turntable.

[0015]

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

FIG. 1 is an exploded perspective view showing an embodiment of the present invention. In the figure, the turntable (23) is made of, for example, a nylon resin mixed with magnetic powder, and has a center shaft mounting hole (3
1) and a through hole (23) into which a drive shaft (29) described later is loosely inserted at a position distant from the center shaft mounting hole (31) in the radial direction.
c) is formed. Further, mounting pin fixing holes (33) (33) into which two mounting pins (26) (26) for mounting the drive shaft support plate (25) and the leaf spring (35) functioning as an elastic member are fitted and fixed. ) And a locking pin fixing hole (32) into which a locking pin (36) for locking the wire spring portion (25a) formed in a part of the drive shaft support plate (25) is fitted and fixed. , Is formed at a predetermined position on the turntable (23).

The drive shaft support plate (25) is made of a metal plate such as stainless steel having a thickness of about 0.1 mm, and has a drive shaft mounting hole (25c) for mounting a support shaft of the drive shaft (29).
Two through holes (25b) and (25b) through which the shaft portion (26a) of the mounting pin (26) described above is inserted are formed.
Further, the portion on the side opposite to the drive shaft mounting hole (25c) is 0.
The wire spring (25 mm) is bent at a right angle with a width of about 5 mm.
a).

Reference numeral (35) is a leaf spring which functions as an elastic member, and is formed by punching out a metal plate having a spring property into a substantially semi-circular shape, and mounting pins (2) near both ends thereof.
6) Insertion holes (35b) (35b) through which the shaft portions (26a) (26a) of (26) are inserted, and two projecting pieces (35) for generating elastic force near the center are formed.
a) (35a) is formed by cutting and raising.

The drive shaft support plate (25) and the leaf spring (35) are attached to the turntable (23) by attachment pins (26) (26). At this time, the hole diameter of the insertion holes (25b) (25b) of the drive shaft support plate (25) is set to be larger than the outer diameter of the shaft portion (26a) of the mounting pin (26). (25) is a range of difference between the hole diameter of the insertion hole (25b) and the outer diameter of the shaft portion (26a) of the mounting pin (26) even after being mounted on the turntable (23) by the mounting pin (26). Is configured to be freely movable in the radial direction and the rotation direction.

The locking pin (36) serves as a radial urging means when the drive shaft (29) supported by the drive shaft support plate (25) moves radially inward by a predetermined distance or more. The wire spring part (25a) of the shaft support plate (25) is fitted into the locking pin fixing hole (32) of the turntable (23) so that the wire spring part (25a) is locked to the shaft part (36a) of the locking pin (36). Fixed together. Thus, the chucking (21) is configured.

FIG. 2 is a view showing the structure of the chucking (21) of the present invention, and FIG. 2 (A) is a hub (40) described later.
FIG. 2D is a plan view seen from the side on which is mounted.
FIG. 2B is a plan view seen from the side opposite to FIG.
2D is a sectional view taken along line XX in FIG. 2D, and FIG. 2C is Y in FIG.
It is a -Y line sectional view.

In the figure, a turntable (23) made of a resin magnet material in which a magnetic powder such as ferrite is mixed in a nylon resin is mounted on a turntable (23a) on which a hub of a disk, which will be described later, is placed. An adsorption surface (23b) for adsorbing the hub on the mounting surface (23a) is formed.
The attracting surface (23b) is magnetized with a single pole or multiple poles.

The drive shaft support plate (25) to which the drive shaft (29) is attached is attached to the attachment pin (2) via a leaf spring (35).
6) It is attached to the turntable (23) at (26). At this time, the drive shaft support plate (25) is urged toward the turntable (23) by a protrusion (35a) formed by cutting and raising the plate spring (35). Further, the insertion hole (25b) formed in the drive shaft support plate (25)
Since the hole diameter of is larger than the outer diameter of the shaft portion (26a) of the mounting pin (26), within the range of the difference between the hole diameter of the insertion hole (25b) and the outer diameter of the shaft portion (26a). The drive shaft (29) and the drive shaft support plate (25) are freely movable in the radial direction and the rotation direction.

Next, the operation of the rotary drive device of the present invention will be described with reference to FIGS.

In FIG. 3, the hub (40) fixed to the central portion of the floppy disk (50) is replaced by the turntable (2).
3) It is a view showing a state at a certain moment when it is placed on top, and FIG. 3 (A) is a plan view seen from the hub (40) side, FIG.
Is a sectional view thereof, and FIG. 3C is a plan view seen from the opposite side of FIG. 3A.

In this state, the drive shaft (29) has not yet been inserted into the drive shaft insertion hole (42) of the hub (40), and the drive shaft (29) resists the biasing force of the leaf spring (35). The lower surface of the hub (40) is pushed down by the suction force of the turntable (23). From this state, in the direction indicated by the arrow R in FIG.
0) rotates (actually, the chucking (21) directly connected to the rotary drive source such as a motor rotates in the direction opposite to the arrow R), and the drive shaft (29) drives the hub (40). The leaf spring (35) is inserted into the insertion hole (42) by the biasing force of the leaf spring (35). The state is shown in FIG.

4 (A), 4 (B) and 4 (C)
Are respectively shown in FIG. 3 (A), FIG. 3 (B) and FIG. 3 (C).
3A and 3B are a plan view viewed from the hub (40) side, a cross-sectional view, and a plan view viewed from the chucking (21) side, respectively. In this state, the drive shaft (29) located on the lower surface of the hub (40) in FIG. 3 has just been inserted into the insertion hole (42) of the hub (40) and is still in the turntable (23). The hub (40) is not positioned with respect to FIG. That is, at this point, the drive shaft (2
9) and the drive shaft support plate (25) are movable in the radial direction and the rotation direction.

From the state of FIG. 4, the hub (40) further rotates in the direction of the arrow R, and one short side (42a) of the drive shaft insertion hole (42) of the hub (40) and the turntable. The drive shaft (29) is clamped by the restriction side (23d) formed in the through hole (23b) of (23), and the hub (40) is completely positioned with respect to the turntable (23). Is shown in FIG. 5 (A) and 5 (B)
5C is a plan view as seen from the hub (40) side, a cross-sectional view and a plan view as seen from the chucking (21) side, as in FIGS. 3 and 4.

The long side (42b) on the outer peripheral side of the drive shaft insertion hole (42) of the hub (40) is separated from the central hole (41) as the relative rotation of the hub (40) progresses. Is formed to be short, the drive shaft (29) is aligned with the central axis (2) along the long side (42b) on the outer peripheral side.
7) side, that is, guided inward in the radial direction. With this,
The drive shaft support plate (25) is also radial and the drive shaft (29)
Moves toward the central axis (27). At this time, the wire spring portion (25) formed on the drive shaft support plate (25)
a) contacts the shaft portion (36a) of the locking pin (36) and bends, and applies a radial urging force to the drive shaft support plate (25) and the drive shaft (29).

As described above, the rotary drive device of the present invention is shown in FIG.
5 shows the drive shaft (29) inserted in the drive shaft insertion hole (42) of the hub (40), the hub (4) shown in FIG.
The drive shaft (29) moves in the horizontal direction and does not tilt until the position 0) is positioned with respect to the turntable (23).

In the above-described embodiment, the leaf spring (35) serving as an elastic member serves as the means for urging the drive shaft support plate (25) in the axial direction, and the two mounting pins (2) serving as the mounting members.
6) Although the example of attaching and forming in (26) is shown, the surface of the turntable (23) on the side where the drive shaft support plate (25) is arranged is magnetized to form magnetic poles, The support plate (25) may be made of a magnetic metal plate, and the magnetic attraction force acting between the magnetic poles of these turntables (23) and the drive shaft support plate (25) may serve as the axial biasing means.
In this case, naturally, the leaf spring (35) as an elastic member is unnecessary.

As the rotation center shaft (27), a rotation shaft of a rotary drive source such as a brushless motor is generally used directly, but the rotation force may be transmitted via a transmission member such as a belt or a gear. .. Further, the rotating shaft (27) may also have the function of the locking pin (36) described above.

[0033]

As described above, the rotary drive device of the present invention minimizes the axial length of the drive shaft itself because the drive shaft does not tilt when the hub of the disk is positioned with respect to the turntable. The rotation driving device can be thinned. Further, since the force component for positioning the hub is only in the radial direction, reliable positioning of the hub is achieved, and a highly reliable rotary drive device can be obtained.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a rotary drive device of the present invention.

FIG. 2 is a diagram showing a structure of a rotation driving device of the present invention.

FIG. 3 is a diagram for explaining the operation of the rotation drive device of the present invention.

FIG. 4 is a diagram for explaining the operation of the rotation drive device of the present invention.

FIG. 5 is a diagram for explaining the operation of the rotation drive device of the present invention.

FIG. 6 is a diagram showing an example of a structure of a conventional rotation drive device.

FIG. 7 is a diagram for explaining the operation of the conventional rotary drive device.

[Explanation of symbols]

 (1) (21) Chucking (3) (23) Turntable (3a) (23a) Mounting surface (3b) (23b) Adsorption surface (3c) (23c) Through hole (3d) (23d) Restricted side ( 5) Leaf spring (5a) Tongue piece (6) (26) Mounting pin (7) (27) Rotating shaft (9) (29) Drive shaft (10) (40) Hub (10a) (41) Center hole ( 10b) (42) Drive shaft insertion hole (25) Drive shaft support plate (25a) Wire spring part (25b) Insertion hole (35) Leaf spring (35a) Projection piece (35b) Insertion hole (36) Locking pin (50) ) floppy disk

Claims (3)

[Claims] 1. A disk provided with a hub having a center hole through which a rotation center shaft is inserted, and a drive shaft insertion hole through which a drive shaft is inserted at a position radially separated from the center hole. A rotary drive device for rotating a circular rotary body, comprising: a central shaft, a hub mounting surface fixed to the central shaft, on which the hub is mounted, and a penetrating hole formed at a position radially separated from the central shaft. A turntable having a hole, a drive shaft support plate disposed on a surface side of the turntable opposite to the hub mounting surface, and a play table supported by the drive shaft support plate and inserted into the through hole of the turntable. A part of the through hole of the turntable, the drive shaft being inserted into the turntable, and an axial biasing means for biasing the drive shaft support plate on the turntable in a direction of press-contacting the turntable. In the rotational direction of the drive shaft In a rotary drive device in which a regulation side for regulating the position is formed, when the hub is not positioned with respect to the turntable, the drive shaft support plate is movable in the radial direction and the rotation direction, and the drive shaft is movable. When the hub is positioned with respect to the turntable without a radial biasing force acting on the drive shaft, a radial biasing means that applies a radial biasing force to the drive shaft is one of the drive shaft support plates. A rotary drive device, characterized in that it is formed in a section. 2. The axial urging means is formed of an elastic member and a mounting member for mounting the elastic member on the turntable so as to apply an axial urging force to the drive shaft support plate. The rotary drive device according to Item 1. 3. The turntable is made of a resin material mixed with magnetic powder, the drive shaft support plate is made of a magnetic metal plate, and the axial biasing means has a single pole or plural poles on the turntable. 2. A magnetic attraction force between a magnetic pole magnetized to the drive shaft and the drive shaft support plate.
The rotary drive described.