JPS598176A - Holding device of rotary disc - Google Patents

Abstract

PURPOSE:To improve the positioning of a disc, by providing an elastic material which presses a center shaft to two planes of a center hole, whose cross section is square, of a hard hub provided in the center of a flexible magnetic disc. CONSTITUTION:An elastic material 19 which consists of an urethane rubber and has the outside shape of a hollow cylinder is provided in a part of a center hole 10. A center shaft 12 is always pressed to two planes 10a and 10b of the center hole 10 by this elastic material 19. for the purpose of reducing a required load for insertion of the center shaft 12, it is desirable that the elastic material 19 has the shape of a hollow cylinder. The force generated on a driving shaft 13 by the rotation of a disc 1 is used to bring the center shaft 12 into contact with two planes 10a and 10b of the center hole 10, thereby positioning the disc 1 automatically.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotating disk holding device suitable for a flexible magnetic disk having a rigid hub at its center.

The conventional rotating disk holding device, as shown in FIG.
A pressing force P1 in the X-axis direction is applied to the drive shaft 6 by a spring 8, and as a reaction force, the central shaft 5 applies a pressing force P2 to the inner rim hole 3 of the hub 2 of the rotating disk (hereinafter referred to as disk) 1. When the disk 1 to be added is rotated, a rotational resistance moment MR is generated by the read/write head (not shown) and the cleaning liner (not shown) on the recording surface of the disk 1, so the drive shaft 6 and Middle nob axis 5 p load 1Q
1=Q2 and the driving moment MD''MR, and it rotates one foot.The driving motor 7 is the distance 11Ilt, t, and the load l from the center of the drive shaft 6 to the center of the central axis 5.
It is the product of Ql.

Here, the force P generated by the spring 8 is also equal to the load Q2.
If 2 is increased, excessive force will be applied when the disk 1 is attached or detached. In addition, the load Q2 is the rotational resistance moment M R
Since it is determined by , it varies depending on the manufacturing error of the case (not shown) into which the disc 1 is inserted. In Figure 1, F2
>If it is Q2, will it be middle school? The shaft 5 is the inclined surface 3 of the center hole 3
It is stable because it is pressed in the direction of a and the inclined surface 3b. However, if p2S and Q2, the central axis 5 is on the inclined surface 3a.
If it slides upward, its position becomes unstable and normal function cannot be maintained.

SUMMARY OF THE INVENTION In view of the above drawbacks, an object of the present invention is to provide a rotating disk holding device with a simple structure and high reliability.

The gist of the invention is to provide a rotating disk having a hub at its center;
A rotary table on which the rotary disk is mounted, a center b-axis provided in the center of the rotary table, a position and a position around the center F9 axis, a drive shaft provided on the rotary table, and a drive shaft provided in the hub. a center hole provided in the hub and into which the central shaft fits; and a drive hole provided in the hub and into which the drive shaft fits, the drive hole being between the center of the center shaft and the center of the drive shaft. The hole is shaped like a long hole that covers 2,000 m1 parallel to the straight line passing through M, lf.
The center hole shaft and the drive shaft have a circular cross-sectional shape, and elasticity that presses the center shaft against two planes of the center hole. The rotating disk holding device includes a body, and the elastic body is made of a rubber-like material.

The present invention will be explained in detail below based on the drawings of the embodiments.

The basic operation and basic configuration of the present invention will now be explained.

In FIGS. 3 to 6, the rotating disk holding device includes a square center hole 10, a drive hole 11f provided at a position away from the center hole 10, a hub 9 provided thereon, and a drive hole 11f provided at a position away from the center hole 10. In order to
7, and a carriage 15 having a head 16 at the bottom and a pad 14 at the top.

FIG. 3 shows a state in which the drive shaft 13 is located to the right and the pad 14 is located to the left with respect to the central axis 12. A force F+ is applied to the drive shaft 13id and the hub 9, and a moment Mof is applied to rotate the rotary disk (hereinafter referred to as disk) 1 clockwise with respect to the central shaft 12. On the other hand, disk l is
The pad 14 and the head 16 are separated and a frictional force F2 is generated.

The frictional force F2 is a counterclockwise rotational resistance moment) MR with respect to the central axis 12. The driving force F+ and the frictional force F2 are
It acts to press the hub 9 against the central shaft 12, and the central shaft 12 pushes the hub 9 with a force of F r −I F2 = F3.
I'm pushing back.

FIG. 5 shows a state in which the disk 1 has rotated half a rotation and the drive shaft 13 has come between the central shaft 12 and the pad 14. Drive shaft 13
gives a rotational driving force 1 to the hub 9. The pad 14 and the head 16 apply a frictional force F2 to the disk 1 in a direction opposite to the rotational driving force F1. Here, due to the presence of the frictional force F2, the hub 9 is pressed against the center shaft 12, and the center/shaft 12 is pushed back by the force FI F2 =F(hub 9f).

FIG. 6 shows a state in which the disk 1 has rotated 1/4 and the drive shaft 13 has come to a position perpendicular to the line connecting the central shaft 12 and the pad 14. The drive shaft 13 applies a driving force F+ to the hub 9. pad], 4 and the head 16 apply a frictional force F2 to the disk 1 that is orthogonal to the driving force Fl. The hub 9 moves toward the central axis 1 in the direction of the sum of driving force F1 and frictional force F2
2, and its central axis 12 is F'+ +
Hub 9f: Pushing back with force of F2=F”3.

In this way, the specific 2 planes ii+1 of the center hole 10 of the hub 9
It is understood that the disk 1 rotates in such a way that 0a and 10'b are always pressed against the central shaft 12. Therefore, the drive hole 11 is made into a long hole shape having two planes parallel to the straight line passing through the center of the central axis 12 and the center of the drive shaft 13, and the center hole 10 is formed in the shape of a long hole that is parallel to the straight line passing through the center of the central axis 12 and the center of the drive shaft 13. In addition to having a shape that covers at least two planes on one side, the central axis 1
If the cross-sectional shapes of the drive shaft 2 and the drive shaft 13 are circular, the hub 9 of the disk 1 can be placed on the rotary table 17 without being misaligned. Since no force F I + F 2 is generated between the central shaft 12 and the drive shaft 13 when the disc 1 is not rotating, the disc 1 can be easily removed from the rotary table 17. During! The two planes 10a and I of the hole 10
OM) If the angle # is 60 degrees or more, 1, disk 1
In this embodiment, the middle ICr hole 10 has a square shape, and the center axis 1
2 plane 10a with respect to the straight line passing through the center of 2 and the middle notch b of the drive shaft 13.

10b and the remaining two planes are arranged symmetrically. Therefore, the disk 1 can be stably installed on the rotary table 17 by using either the upper or lower surface of the disk 1.

Here, if there is an accident in which the carriage 15 moves toward the central axis 12, the pad 14 will move as shown in FIG.
The frictional force in the center direction due to the head 16 is F4, and the force exerted by the hub 9 on the central shaft 12 is F I I-E
2@F4=F', so depending on the magnitude of the frictional force F4, all of the force F'''3 acts on the plane 10a, and the force acting on the plane 10b becomes zero.Therefore,
Since the central axis 12 freely moves on the side 10a, the knob b may fluctuate while the disk 10 is rotating.

The present invention is designed to prevent this change 1iJJ, and an embodiment thereof will be explained based on FIGS. 7 to 11.

In FIGS. 7 to 11, the same reference numerals as in FIGS. 3 to 6 indicate the same contents. 7 to 11, an elastic body 19 made of urethane rubber and having a hollow cylindrical appearance is provided in a part of the center hole 10, and this elastic body 11 allows the center axis 12 to be aligned between two planes of the center hole 10. 10i'l and 10b are always published. The drive hole 18 in this case is not a through hole but is blind. The drive hole 20 is provided on a surface opposite to the surface on which the drive hole 18 is provided, and is
Like 8, he is blind. The drive hole 20 and the drive hole 18 are arranged symmetrically with respect to the middle IL>hole 10, as shown in FIG. Further, the elastic body 19 is held on the upper and lower surfaces of the hub 9, which is composed of a lower piece 9b having a boss 9C and an upper piece 9a having a hole into which the boss 9C fits, and the elastic body 19 is held on the upper and lower surfaces of the hub 9. The opening dimension e and the diameter d are dog-shaped, and the structure is such that the lower piece 91) and the second side piece 9a do not easily pull out after being held. Here, the elastic body 19 is made of a rubber-like material and has a hollow cylindrical shape, so that the amount of oil required for inserting the central shaft 12 can be reduced.

The hub 9 itself is composed of two parts, a lower piece 9b and an upper piece 9a, made of plastic or the like, and the dimensional accuracy of the two planes 10a, 10b of the center hole 10 is on the order of 0.05 mm. The accuracy required for the track recording density of 100 TPi (tracks/inch) on disk 1 is the above dimensional accuracy of 0.
．． Since the change of 0.5 mm can be obtained by reducing the spring constant of the elastic body 19, the change in insertion force is also small and a stable function can be obtained.

Disk 1 is a flexible magnetic disk with a diameter of approximately 7 mm.
A two-cylinder, 77 micron thick one is used. The outer diameter of the hub 9 is approximately 16 wn, and the thickness of the hub 9 is 4 mm. The drive hole 18.20 is set to have a major axis of 2.5 mm. The outer diameter of the boss 9c is set to 7 mn+. The diameter of the center axis 12 is 4 mm, and the planes other than the two planes of the center hole 1° (1
The gap between the plane (other than 0a, 10b) and the center I shaft 12 is 0.
．． Set between 05 and 0.1. The elastic body 19 is made of polyurethane rubber which is resistant to abrasion and has high mechanical strength.

The disk 1 used in this embodiment is housed in a case lined with a liner that has a cleaning effect and provided with a window for opening and closing the window and a shutter for opening and closing the window.

In the second embodiment shown in FIG. 9, by forming the elastic body 19 into a hollow rectangular prism, the side length d' of the rectangular prism can be made larger relative to the opening dimension e' to the central hole 10. Since it becomes more difficult to pull out and the spring constant of the elastic body 19 can be made smaller, the change in the insertion force of the center shaft 12 due to errors in the dimensions of the center hole 10 and the center shaft 12 can be further reduced.

In the third embodiment shown in Fig. 10.11, the lower heath 9b constituting the nozzle 9 is made of a pressed steel plate with a center hole 10 formed by precision punching or burring, and the center hole 10 is formed by insert molding. The shaft 12 is resistant to abrasion that occurs when the shaft 12 is attached and detached, and the deformation that occurs in the flat surfaces 10a and 10b due to the rotational excitation force is small, so that the positional accuracy can be improved, and the disk 1 can be made even more precise.

According to the above configuration, the disk 1 is driven by the center shaft 12 coming into contact with the two planes (108, 10b) of the center hole 10 by utilizing the force generated in the drive shaft 13 due to its rotation. automatically positioned.

Even if the disk 1 is repeatedly attached and detached, the rotary table 17 and the hub 9 are installed at approximately the same position.

Furthermore, the two planes 10a and 10b of the central hole 10, the central axis 1
2 is forcibly pressed by an elastic body, even if there are disturbances such as uneven rotation when starting the disk 1 or lateral forces generated when the head and pad move,
The disk 1 does not wobble during rotation, and reading or retraction can be performed accurately.

Furthermore, the positioning when attaching and detaching the disk 1 (when installing) is as follows.
This can be done accurately by changing the shape and position of the center hole 10 and drive hole 11, resulting in an extremely simple structure and easy machining.

As described above, according to the present invention, the positioning of the disk can be performed accurately and with a simple configuration when the disk is mounted, and an extremely reliable rotating disk holding device can be provided.

[Brief explanation of the drawing]

FIG. 1 is a top view of the main parts showing a conventional example, FIG. 2 is a vertical sectional view of the main parts of FIG. 1, FIG. 3 is a top view of the main parts showing an embodiment of the present invention, and FIG. Longitudinal cross-sectional view of main parts in Figure 3, Figures 5 and 6
The figure is a top view of the main part showing the operation status of the present invention, FIG. 7 is a top view of the main part showing another embodiment of the invention No. 1, FIG. 8 is a vm-vm sectional view of FIG. 7, and FIG. 10 is a top view of main parts showing another embodiment 2 of the present invention, FIG. 10 is a top view of main parts showing another embodiment 3 of the present invention, and FIG. . 1... Rotating disk, 10... Center hole, 10a, 1
0b...Plane, 9...Hub, 12...Central axis, 1
3... Drive shaft, 17... Rotary table, 19...
Elastic body, ti, is. 20... Drive hole. Agent Patent Attorney Akio Takahashi $3 Prisoner 1516 No. 5, No. 7 Kishi tI Fast-talking 70 No. /1 Continuation of No. 1, No. 0 Author: Toru Sanbe Hitachi, Ltd. Home Appliances, 292 Yoshida-cho, Totsuka-ku, Yokohama Intra-laboratory procedure amendment (method patent Ij゛Display of the case of Mr. Kazuo Wakasugi, Director-General, 1981 Special g'rlffi No. 117090 Name of the invention: Person who corrects rotating disk holding device) (Tonoseki 11 Patent application Person + 14 i'lj Marunouchi, Chiyo January Ward, Tokyo -
・-■ Item 5 No. 1 Name Former 51o) Hitachi Co., Ltd.
Manufacturer Representative 3 1) Osamu Katsu Shigeyo Location: 5-chome, Kuunouchi-chome, Chiyo, IJJ-ku, Tokyo Subject of amendment No. 1 (1) The application and specification will be supplemented.

Claims (1)

[Scope of Claims] 1. A rotating disk having a central part, a rotating table on which the rotating disk is placed, a central axis provided at the center of the rotating table, and a rotating disk located around the central axis. , and a drive shaft provided on the rotary table, a center hole provided in the hub into which the center shaft fits, and a drive hole provided in the hub into which the drive shaft fits. The drive hole has a straight hole shape having 2,000 planes parallel to a straight line passing through the center of the central axis and the center of the drive shaft,
Moreover, the central hole has at least two holes on one side of the straight line.
It has a plane, and the angle between the two planes is 660''~1
The center hole of the hub is provided with an elastic body that presses the center and the shaft against two planes of the center hole. In the rotating disk holding device 41a, the elastic body is made of a rubber-like material. 2. The rotating disk holding device according to claim 1, wherein the hub has a substantially symmetrical shape across the rotating disk and is composed of two parts to hold the elastic body. 3. The cross-sectional shape of the elastic body is rectangular, circular, etc., and the opening to the center hole is smaller than the side length or diameter of the cross-sectional shape. The rotating disk holding device according to item 1. 4. The rotating disk holding device according to claim 1, wherein the elastic body has a cross-sectional shape such as a rectangular or circular outer shape, and a hollow portion is provided inside, for example, in a circular shape. 5. The rotating disk holding device according to claim 1 of Patent H, characterized in that one blind drive hole is provided on each of the front and back sides of the hub, and the drive holes are arranged symmetrically with respect to the center hole. . 6. The rotating disk holding device according to claim 1, wherein the centering of the hub is reinforced with a steel plate or the like on at least one side of the hub.