JPS62208463A - Rotation driving device - Google Patents

Abstract

PURPOSE:To surely and correctly attain positioning of a rotating body by energizing a driving member in the outer radius direction of rotating body, arranging a freely rotatable regulating member at the position where the driving member can be abutted, and regulating the falling of the driving member in the rotating direction of a hub stand. CONSTITUTION:A lever 16 is regulated by a position regulating part 141 so that it cannot come to be horizontal at the most raised position, a roller 19 shifts a hub 15 in the outer direction of a radius direction while the roller is rotated by a frictional force with the end part of the window hole of the hub 15 and a rotating body is positioned to a regular positioning position. Here, when the roller 19 falls in the rotating direction of the hub stand 12 by the absorption force of the hub 15 by a magnet 13 and the friction force with a magnetic head with the rotating body, the falling of the roller 19 is regulated by a roller 20, the relative dislocation in the rotating direction with the hub stand 12 and the rotating body is prevented, and index period dislocation, rotating jitter, etc., are prevented. In such a way, positioning of the rotating body is surely and correctly attained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a rotational drive device for driving a rotating body such as a magnetic disk, for example.

(Prior Art) Rotating bodies such as magnetic disks are in practical use as recording media for information signals. Such a rotating body is placed on a hub stand provided integrally with a rotating shaft driven by a motor, and a driving member such as a drive pin that rotates integrally with the hub stand is engaged with a window hole of the rotating body. It is designed to be rotationally driven.

FIG. 5 schematically shows the relationship between such a rotating body and a hub stand. In FIG. 5, reference numeral 1 denotes a hub of a disc-shaped rotating body serving as an information signal recording medium, and the hub 1 has a square center hole 2 formed at its center, and is located at a position offset from the center. A rectangular window hole 3 is formed in.

Reference numeral 4 denotes a rotating shaft driven by a motor, and the rotating shaft 4 is integrally provided with a hub stand (not shown) on which the rotating body is placed, and a drive pin is located at a position offset from the center of the hub stand. 5 is provided. The drive pin 5 is fixed to a leaf spring (not shown), and is urged by the elasticity of the leaf spring to move outward in the radial direction of the hub base.

When the rotary body is loaded into a predetermined position of the rotary drive device, the rotary shaft 4 is fitted into the center hole 2 of the hub 1, and the drive pin 5 is inserted into the window hole 3.
fits. Assuming that the hub stand is rotationally driven in the counterclockwise direction in the figure, the drive pin 5 will hit one side end of the window hole 3, and the drive pin 5 will tilt outward in the radial direction due to the elasticity of the leaf spring. This corresponds to the outer edge of the window hole 3.

As a result, a force in the circumferential direction and a positioning force in the radial direction are applied to the hub 1 by the drive pin 5, and the resultant force of the two causes the rotating shaft 4 to be placed in one corner of the center hole 2 of the hub 1.
The hub 1 is positioned with the pins 5 touching one corner of the window hole 3, and the hub 1 is rotationally driven as the drive pin 50 rotates. Since a rotating body such as a magnetic disk is integrally fixed to the hub 1, the rotating body is driven to rotate together with the hub 1, information signals are recorded on the rotating body, and recorded signals are read out.

According to such a rotational drive device, when the rotary body is rotationally driven by the drive pin 5, the drive pin 5 receives a force in the rotational direction of the hub base due to the rotational resistance of the rotary body and tilts, causing the relationship between the hub base and the rotary body to be tilted. Since there is a problem that the relative position in the circumferential direction shifts or fluctuates, resulting in a shift in the index period and an increase in rotational jitter of the rotating body, a stopper is installed to restrict the swinging of the drive pin. A rotary drive device has been proposed in which the drive pin is placed close to or in contact with the drive pin to restrict swinging of the drive pin in the rotational direction of the hub stand. The invention of Utility Application No. 58-203314 filed by the present applicant is one of them.

On the other hand, instead of a drive pin, a roller or a bearing rotatably supported around a support shaft is used as a drive member, and this drive member touches the outer edge of the window hole of the hub and moves to a corner of the window hole. A system has also been considered in which the hub positioning operation performed by moving the hub can be performed smoothly without resistance.

(Problem to be Solved by the Invention) Even if a roller or a bearing is used as a driving member to rotationally drive the hub of a rotating body, if a regulating member is provided to prevent the roller or bearing from falling down, F! caused by contact between the bearing and the regulating member. The J friction force prevents the rotation of the rollers and bearings, increases the frictional force between the edge of the hub window hole and the rollers and bearings, and causes the rollers and bearings to get caught before they reach the correct positioning position. However, there is a possibility that the effect of using a roller or bearing as a driving member and the effect of providing a regulating member cannot be fully exhibited. Such problems are
This problem cannot be solved even if the positioning force caused by the driving member such as the roller is increased. In other words, in order to reliably position the rotating body, it is necessary to make the positioning force of the driving member such as a roller sufficiently large, but if this positioning force is increased, the edge of the window hole of the rotating body will cause the driving member to This is because the resistance force that the driving member receives is large, the force with which the driving member is pressed against the regulating member increases, and even if a roller or the like is used as the driving member, its smooth rotation is hindered and accurate positioning cannot be performed.

The present invention has been made to solve such conventional problems, and includes a regulating member that regulates the inclination of the driving member.
A rotary drive that ensures reliable and accurate positioning of the rotating body by ensuring that even if the positioning force exerted by the drive member on the rotating body is sufficiently large, the positioning force is not obstructed by the regulating member. The purpose is to provide equipment.

(Means for Solving the Problems) The present invention urges a driving member for engaging with a window hole of a rotating body and driving the rotating body outward in the radial direction of the rotating body, and the driving member The invention is characterized in that a rotatable regulating member is disposed at a position where it can come into contact with the hub stand, thereby regulating the tilting of the drive member in the direction of rotation of the hub stand.

(Function) The driving member engages with the window hole of the rotating body, and positions the rotating body at a normal position by applying a radially outward biasing force. The tilting of the drive member in the direction of rotation of the hub stand is regulated by the regulation member, but since the regulation member is rotatable, the frictional force caused by contact between the drive member and the regulation member is small, and the positioning of the rotating body is is carried out smoothly.

(Example) Hereinafter, an example of a rotary drive device according to the present invention will be described with reference to the drawings.

In FIGS. 1 to 4, a ring-shaped hub stand 12 is press-fitted and fixed to a rotating shaft 11 that is rotationally driven by a motor. A hub 15 (see FIG. 3), which is a disk-shaped rotating body such as a magnetic disk, is attached to or placed on the hub stand 12. A hub cup 14 is fixed to the lower surface side of the hub stand 12. A notch 142 is formed in a part of the outer periphery of the hub cup 14. A chucking magnet 13 is attached within the hub cup 14 so as to surround the hub stand 12. The magnet 13 is for attracting the hub 15 of the rotating body and holding it on the hub stand 12. A notch 131 is formed in a part of the magnet 13, and this notch 131 is connected to the notch 1 of the hub cup 14.
It overlaps with 42.

An appropriate number of position regulating portions 141 are protruded from the lower surface of the hub cup 14 at appropriate positions. A lever 16 is supported by a lever shaft 17 on the lower surface side of the hub cup 14. An escape hole 132 for the shaft 17 is formed in the magnet 13 . The lever 16 is formed in a substantially ring shape so as to escape from the hub stand 12. A long hole 161 in the radial direction is formed in the lever 16, and by fitting this long hole 161 into the shaft 17, the lever 16 can move freely in the radial direction within the range of the long hole 161 and perpendicular to the surface of the lever 16. It is supported so as to be able to swing within a plane. A protrusion 163 is formed on the opposite side of the lever 16 from the shaft 17 across the center thereof, and a roller 19 is attached to the protrusion 163.
is rotatably supported by a roller shaft 21. The roller 19 constitutes a driving member that engages with a window hole of the rotating body to drive the rotating body, and projects from the notch 142 of the hub cup 14 to the upper surface side of the hub cup 14 . Lever 16
There are spring hooks 162 bent downwards on both sides of the support by the shaft 17. A coil spring 18 is wound around the shaft 17, and both ends of the spring 18 are hung on the spring hooks 162 on both sides. The lever 16 is urged to move in the radial direction by the elasticity of the spring 18, and this urging force becomes a positioning force P by the roller 19. In addition, both ends of the spring 18 are hung on spring hooks 162 extending downward from both sides of the lever 16, so that the lever 16 is rotated in a plane perpendicular to the surface of the lever 16, with the abutment part 141 of the hub cup 14 as a fulcrum. The roller 19 is urged to rotate within the hub base 12, thereby urging the roller 19 to protrude toward the upper surface of the hub stand 12.

On the upper surface side of the hub cup 14, a roller 2o is rotatably supported by a roller shaft 22 at a position adjacent to the roller 19. The roller 2o serves as a driving member and a regulating member for the shiteno roller 19, and is arranged in contact with the outer circumferential surface of the roller 19 or in close proximity to the outer circumferential surface of the roller 19,
The roller 19 is designed to prevent the hub stand 12 from falling in the direction of rotation.

Next, the operation of the above embodiment will be explained.

Now, when the rotating shaft 11 is driven by a motor (not shown), the hub stand 12 and the components attached above and below the hub stand 12 are integrally driven to rotate. The direction of this rotation is clockwise in FIG. When the rotating body is installed in a predetermined position of the rotation drive device, the hub 15 of the rotating body is placed on the hub stand 12, and the rotating shaft 1 is inserted into the center hole of the hub 15.
1 fits. Until the roller 19 engages with the window hole of the hub 15 of the rotating body, the roller 19 is pushed by the hub 15, the lever 16 is rotated in a direction perpendicular to the surface of the lever 16 against the spring 18, and the roller The upper surface of the hub stand 12 is the same as or lower than the upper surface of the hub stand 12. During one rotation of the hub base 12, the roller 19 reaches the position of the window hole in the hub 15, and the lever 16 is rotated by the force, so that the roller 19 rises and engages with the window hole in the hub 15.

The lever 16 is regulated by a position regulating portion 141 so that it is horizontal at the highest position. The roller 19 moves the hub 15 radially outward while rotating due to the frictional force with the edge of the window hole of the hub 15, thereby positioning the rotating body at a normal positioning position.

Here, when the roller 19 tries to fall in the rotational direction of the hub stand 12 due to the attraction force of the hub 15 by the magnetic eye 3 or the frictional force between the rotating body and the magnetic head, the fall of the roller 19 is regulated by the roller 20. Relative displacement between the hub stand 12 and the rotating body in the rotational direction is prevented, and index period displacement, rotational jitter, etc. are prevented. Also, roller 1
The regulating member that restricts the falling of the roller 9 is the roller 20, and the roller 20 rotates freely together with the roller 19, and the frictional force between them becomes extremely small, so that the rotation of the roller 19 during the positioning operation of the rotating body is Roller 2 as a regulating member
0, and the rotating body can be positioned reliably and accurately.

Note that the driving member may be a ball bearing instead of a roller, and even in the case of a conventionally commonly used driving pin, the regulating member that restricts the falling of the driving pin can be made rotatable. You can get the effect of the period.

The lever shaft 17 in the above embodiment may be attached to a member other than the hub cup 14, and in this case, there is no need to provide the position regulating member 141.

If the roller 19 is biased to move upward together with the shaft 17, there is no need for the spring 18 to bias the lever 16 in the lifting direction. Furthermore, if the lever 16 is configured with a leaf spring to bias the roller 19 in a predetermined direction, the spring 1
8 and the position regulating portion 141 of the hub cup 14 are no longer necessary.

(Effects of the Invention) According to the present invention, since the regulating member for regulating the tilting of the driving member in the rotational direction of the hub stand is rotatably provided, the regulating member for regulating the tilting of the driving member in the rotational direction of the hub stand is rotatably provided. Transmission is no longer obstructed by the restriction member, and thus the rotating body can be positioned reliably and accurately.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of the rotary drive device according to the present invention, FIG. 2 is a cross-sectional view of a lever supporting a hub stand and a drive member in the above embodiment, and FIG. 3 is a plan view of the above embodiment. FIG. 4 is a cross-sectional view of the drive member and regulating member inside, FIG. 4 is a vertical cross-sectional view of FIG. 1, and FIG. 5 is a plan view schematically showing the relationship between the rotating body and the hub stand. 11--rotating shaft, 12--hub stand, 15--
-. Hub of rotating body, 19-. Drive member, 20-.
- Regulatory components.

Claims (1)

[Claims] It is installed integrally with the rotating shaft driven by the motor,
A rotary drive comprising a hub stand for attaching a disc-shaped rotating body, and a drive member that rotates integrally with the hub stand and engages with a window hole of the rotating body to drive the rotating body. In the device, the driving member is biased outward in the radial direction of the rotating body, and a rotatable regulating member is disposed at a position where the driving member can come into contact with the driving member, thereby tilting the driving member in the rotational direction of the hub stand. A rotary drive device characterized in that it regulates.