JPH0354758A - Disk chucking mechanism - Google Patents

Abstract

PURPOSE:To prevent a driving pint from being abutted to the side wall of a flange when a medium is clamped by providing a guide means, which regulates the move of a supporting member in a circumferential direction, between the flange and the supporting member. CONSTITUTION:When a flange 8 is rotated, a driving pin 3 is abutted to a side wall 5 of a long hole 4 and this side wall 5 is pressed in a rotary direction. By this pressing, a center hub 1 of a disk is moved and the two side of an opening are abutted and engaged to a spindle 2. Accordingly, the central position of the disk is determined and the disk is held in a fixed position. At such a time, a chuck board 9 is guided by a guide pin 15 in the rotary direction (circumferential direction) of the disk. Thus, when the medium is clamped, the driving pin 3 is prevented from being abutted to the side wall of the flange 8 and chucking operation can be stably and surely executed without fail.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disk chucking aMX for positioning a magnetic disk, such as a floppy disk, loaded in a magnetic disk device to a predetermined position.

[Prior Art] For example, in a 3.5-inch or 3-inch floppy disk, the magnetic storage medium is housed in a hard case with a spindle hole drilled in the center of one side and a drive pin on the outside. There is an opening for insertion. A shutter for tracking the magnetic head on the magnetic storage medium surface is provided on the other surface, and is opened when the disk is loaded into the magnetic disk drive and closed when the disk is removed. Figure 8 shows the chucking structure of a conventional magnetic disk device.
FIG. 2 is a plan view showing a state in which a floppy disk is inserted into a drive section of a magnetic disk device and is set in a state where the disk can rotate. A floppy disk has a square opening 1a at the center of rotation of a center hub l made of ferromagnetic material.
The spindle 2 of the drive motor M is fitted into the holder. The drive motor M has a drive pin 3 that rotates integrally with the spindle 2, and a long hole 4 into which the drive pin 3 can be fitted is provided adjacent to the opening 1a. The elongated hole 4 is formed so that the longitudinal force direction is perpendicular to the direction of the radius of rotation.

By the way, when the two floppy disks are loaded into the chucking mechanism, they are lowered while being positioned on the M-magnetized flange, and the center hub 1 is held on the flange by being attracted by the magnetic force of the flange. However, immediately after the floppy disk is loaded, the drive pin 3 and the slot 4 do not always coincide conveniently; in fact, in most cases they do not coincide. In this case, the drive pin 3 is pressed down so as to come into contact with the lower surface of the center hub l of the floppy disk. When the motor is energized in this state, the drive pin 3 rotates while the magnetic medium stops rotating, and the drive pin 3 fits into the elongated hole 4 before one rotation, and at the same time, the floppy disk is connected to the drive pin 3. Or rotate.

Regarding this type of mechanism, for example, Japanese Patent Application No. 62-270444 and Japanese Patent Application No. 62-2841
There is one described in Publication No. 98.

[Problem to be solved by the invention J However, in the above-mentioned conventional magnetic disk device,
When attempting to rotate the magnetic medium in two directions during media clamping, the drive pin 3 comes into contact with the side wall 5 of the elongated hole 4, and this collision places a large load on the drive pin 3. Due to this, the drive pin 3 is attached to the side wall 7 of the flange hole 6, which is indicated by a broken line.
There was a possibility that the rotation of the drive pin 3 would be inhibited.

The present invention has been made to solve these problems, and an object of the present invention is to provide a magnetic disk drive in which the drive pin does not come into contact with the side wall of the flange during media clamping.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a flange having ferromagnetic material on both sides, fixed to a spindle, and having a storage medium on a disk written thereon; a drive pin that protrudes from the flange and rotates the storage medium; an engagement member that is partially engaged with the flange; and the engagement member and the drive pin remain fixed while facing each other with the spindle at the center. In the disk chucking mechanism, the disk chucking mechanism includes an annular support member that is swingably superimposed on the flange, and biasing means that biases the support member toward the spindle when viewed from the engagement member. Guide means for restricting movement of the member in the circumferential direction is provided between the flange and the support member.

[Operation] With the above structure, the movement of at least the support member near the drive pin in the circumferential direction (rotation direction) is regulated by the guide means, and therefore the rotation of the drive pin in the medium rotation direction is restricted. movement is regulated. As a result, the drive pin can be prevented from coming into contact with the side wall of the flange during media clamping, and the chucking operation can be performed stably and reliably.

Embodiment 1 FIG. 1 is a bottom view showing the main structure of an embodiment of the present invention.
FIG. 2 is a sectional view taken along the line ■--■ in FIG. 1, and shows the state in which the drive pin is projected. Moreover, FIG. 3 is a front sectional view when the button is pressed down. Furthermore, FIG. 6 is a cross-sectional view of FIG. 1 in the state in which the drive pin is projected, and FIG. 7 is a front cross-sectional view showing the state in which the drive pin is pressed down from the state shown in FIG. There is. Note that, in the following, the same reference numerals are used for the same parts as in FIG. 8, so redundant explanation will be omitted.

A disc-shaped flange 8 as a supporting member is fixed at right angles to the axis of the spindle 2 on the upper part of the spindle 2, which is the output rotation shaft of the disk rotation motor M, and a flange hole 6 formed in a part of the disc-shaped flange 8 is fixed at right angles to the axis of the spindle 2. A drive pin 3 is installed at the. At the bottom of the flange 8, an annular chuck plate 9 is arranged concentrically with the spindle 2 so as to be able to swing up and down. Tab l as a shaped fastening member of part 10a
O is fixed. In order to allow the dowel 10 to move freely, the flange 8 is formed with an elongated hole l1 having a semicircular shape and a bulge in the radial direction. Iku l2
is provided. Further, a spring 13 is pressed into contact with the dowel 10 for biasing the chuck plate 9 in the direction of the drive pin 3 , and both ends of the spring 13 are attached to a pin 14 erected on the flange 8 .
a, 14b.

Further, a guide pin l5 as a guide means for guiding the chuck plate 9 (regulating the movement of the chuck plate 9) is provided on the flange 8 (one end is caulked to the flange 8, and the other end is on the side of the chuck plate 9). A penetration length J16 into which the guide pin l5 is loosely fitted is formed on the chuck plate 9. Further, the flange 8 is magnetized in order to magnetically attract and hold the center hub 1 of the disk, and to attract the chuck plate 9 to urge the drive pin 3 in the direction in which the center hub 1 is inserted. .

4 and 5 show the magnetized state of the disk mounting surface of the flange 8 and the chuck plate side.

In each case, the N pole and S pole are alternately divided into eight regions equally divided into 45 degrees in the circumferential direction.
Pole, N pole, S pole... and the magnetized state of the disk a placement surface and the chuck plate side as shown in Figures 4 and 5, so that the upper and lower magnetic poles are different, and the thickness is It is magnetized in the direction. In addition, although the example of the magnetization angle of 45° was shown,
The angle is not limited to this, and any angle can be used.

Furthermore, the chuck plate 9 is entirely made of ferromagnetic material, and is processed into an annular shape with an opening formed in the center to allow the spindle 2 to escape. The structure has sufficient rigidity so that the drive pin 3 will not bend even if it is pressed by the center hub l during chucking. The mounting side of the drive pin 3 of the chuck plate 9 has a tab l.
It is arranged so that it can be raised and lowered using the mounting part of O as a fulcrum.

As shown in FIG. 1, the flange 8 has a large hole 8a formed from the outer circumferential side toward the inner circumferential side through which the flange 10a of the dowel 10 can be inserted. 10
A small hole 8b is formed through which only the body (portion below the collar 10a) can be inserted.

When attaching the chuck plate 9 to the flange 8, first insert the dowel 10 of the chuck plate 9 into the large hole 8a, and then shift it toward the small hole 8b, so that the collar 10a is attached to the periphery of the small hole 8b. is secured to the upper surface of the flange 8. After this, move the hinge l3 to the pins 14a and 14b with the dowel lO as the center.
By intervening in a bent state between
It is possible to generate an external force. The dowel 10 is urged in the direction of the drive pin 3 by the spring l3, the inside of its body is pressed against the flange 8, and the flange 10a rides on the recess l2 and is stably held, so that the dowel 10 is held in the small hole part 8b. The chuck plate 9 is stably attached to the flange 8 without coming off. The spring l3 is housed within the thickness of the flange 8 so as not to impede the adhesion between the flange 8 and the chuck plate 9. In addition, the flange 10 of the dowel 10
The position a is set so that there is a slight gap between it and the disk mounting surface on the flange 8 when it is attached to the flange 8.

With such a mounting structure, the chuck plate 9 can be attached to the dowel 10.
With this rocking, the drive pin 3 is moved toward and away from the disk mounting surface on the flange 8 through the flange hole 6. It becomes possible to move up and down in the direction B in Figure 2 or B2. The chuck plate 9 is attracted upward as shown in FIGS. 2 and 3 by the magnetic force of the flange 8, which is magnetized as shown in FIGS. 5 and 6. As a result, the drive pin 3 is always energized in the direction (B1 direction in the figure) in which it fits into the elongated hole 4 of the center hub l of the disk, as will be described later.

The length of the guide pin l5 is set to such a length that the lower end of the guide pin l5 does not come off from the chuck plate 9 even when the chuck plate 9 swings, as shown in FIGS. 6 and 7. ．． Next, the chucking operation of the embodiment with the above configuration will be explained.

First, when the disc is not installed, the flange 8
The chuck plate 9 was attracted to the lower surface of the flange 8 by the magnetic force of (or the attached permanent magnet), and the drive pin 3 protruded to the disk mounting surface on the upper surface of the flange 8 through the flange 6, as shown in FIG. in a state. Also, drive pin 3
The chuck plate 9 is guided by the guide pin l5 and is pressed toward the outer circumference of the flange 8 by the biasing force of the spring l3.

Next, when a loading mechanism (not shown) starts loading the disc, the disc rotation motor M rotates.
The flange 8 starts rotating together with the spindle 2. Then, as the disk is placed on the center hub l or flange 8, the spindle 2 or the opening 1 of the center hub 1
a and is attracted to the flange 8 by the magnetic force of the flange 8. As a result, the disk is mounted on the flange 8. Then, when the drive pin 3 is aligned with the elongated hole 4 at the point where the disk has been completely attached to the flange 8, the chuck plate 9 receives the urging force of the spring 13 with the dowel 10 as the fulcrum, as shown in FIG. Since the drive pin 3 is biased to be pushed upward by the drive pin 3, the upper part of the drive pin 3 is exposed from the upper surface of the elongated hole 4. On the other hand, if the drive pin 3 does not match the long hole 4, the tip of the drive pin 3 is pushed down by the lower surface of the center hub l and is located in the flange hole 6 as shown in FIG. As a result, the side end of the drive pin 3 of the chuck plate 9 is pushed down and separated from the lower surface of the flange 8. Then, the flange 8 rotates while idling with respect to the center hub 1,
When the drive pin 3 reaches a position facing the elongated hole 4 of the center hub 1, the chuck plate 9 is attracted to the flange 8 because a magnet is attached to the flange 8 as shown in FIG.
As shown in Figure 2, the drive pin 3 is exposed on the top surface through the long hole 4. At the same time, the chuck plate 9 comes into close contact with the lower surface of the flange 8. When the flange 8 further rotates, the drive pin 3 comes into contact with the side wall 5 of the elongated hole 4 shown in FIG. 8, and presses this side wall 5 in the rotational direction. Due to this pressure, the center hub l of the disk moves and comes into contact with and engages with the spindle 2 on two sides of the opening 1a. This determines the center position of the disk and holds the disk in place. At this time, the chuck plate 9 is guided by the guide pin l5 in the rotational direction (circumferential direction) of the disk. Therefore, there is no risk that the drive pin 3 will come into contact with the flange 8. In this way, the chucking operation of the disk to the flange 8 is completed, and the disk can thereafter rotate together with the flange 8.

According to the embodiment shown above, the chuck plate 9 is shaped by a ferromagnetic material, and by magnetically attracting the chuck plate 9, the driving pin 3 is urged in the direction B, which is to fit the drive pin 3 into the center hub l. Therefore, as a result of the spring 13 urging the drive pin 3 toward the outer circumference of the disk, a cylindrical structure that only presses the dowel 10 of the chuck plate 9 can be achieved. And since the spring constant can be set small, the spring pressure can also be kept constant. According to this embodiment, since the chuck plate 9 is urged in the B+ direction by magnetic force, large rigidity can be generated without using the chuck plate 9 as a plate spring, and it is possible to drive the chuck plate 9 during chucking. Even if the pin 3 is pressed by the center hub l, it will not tilt. In addition, since the chuck plate 9 is always guided by the guide pin 15, the position of the drive pin 3 in the medium rotation direction is fixed, and the drive pin 3 does not contact the flange 8, resulting in stable rotation.
Chucking operation can be performed stably and reliably.

That is, during the above-mentioned chucking operation, when the disk is attached to the center hub 1 or the flange 8, the center hub l may be attached with an eccentric position, or the center hub l may be attached to the center hub l.
Even if the drive pin 3 is pressed toward the spindle 2 due to variations in mounting, the chuck plate 9 has appropriate rigidity.
is not bent, and the whole part is attracted to the flange 8, and the eight parts 13
Since the drive pin 3 moves in the direction of arrow A2 in FIG. 2 against the urging force of , the drive pin 3 moves in parallel without being tilted. In this case, in the conventional chucking mechanism using a leaf spring, the center hub l is pressed due to the inclination of the drive pin 3,
A phenomenon occurred in which the center hub 1 rose above the flange 8, and the drive pin 3 came into contact with the inner wall of the flange hole 6, inhibiting rotation. However, according to the present invention, such a phenomenon does not occur and a stable chucking operation can be performed.

In addition, when locking the center hub l in a fixed position, even if the drive pin 3 is pressed against the center hub l in the opposite direction to the rotational direction due to the center hub 1 being a load with respect to the rotational direction of the flange 8, Since the chuck plate 9 is guided by the guide pin 15 and is attracted to the flange 8, it does not tilt and its angle is always kept constant. Although the present invention has been specifically described above based on the embodiments, it goes without saying that the present invention is not limited to the embodiments described above, and can be modified in various ways without departing from the gist thereof.

For example, when providing the guide pin 15, it may be formed integrally with the flange 8, or it may be supported on the end surface of the chuck plate 9 instead of the pin.

[Effects of the Invention] As is clear from the above, according to the present invention, there is provided a flange which has a ferromagnetic material on both sides and is fixed to a spindle and on which a storage medium on a disk is written, and a flange which protrudes from the flange and which a drive pin that rotates the storage medium; a locking member that is partially locked to the flange; and a locking member that can freely swing on the flange while the locking member and the drive pin are facing and fixed around the spindle. In the disk chucking mechanism, the disk chucking mechanism includes an annular support member that is superimposed on the support member, and a biasing means that biases the support member toward the spindle when viewed from the engagement member, in a circumferential direction of the support member. Since the guide means for regulating the movement of the media is provided between the flange and the support member, it is possible to prevent the drive pin from coming into contact with the side wall of the flange during media clamping, and to perform the chucking operation stably and reliably. I can do it.

[Brief explanation of drawings]

FIG. 1 is a bottom view showing the main structure of an embodiment of the present invention;
Figure 2 shows II of Figure 1 in the state when the drive pin is protruding.
- II arrow sectional view, Figure 3 is a front sectional view when pressed in Figure 2, Figures 4 and 5 are magnetic pole arrangement diagrams showing the magnetized state of the disk mounting surface of the flange and the chuck plate side,
Figure 6 shows Vl in Figure 1 when the drive pin is protruding.
7 is a front sectional view showing a state in which the drive pin is pressed down from the state shown in FIG. 6, and FIG. 8 is a plan view showing the chucking mechanism of a conventional magnetic disk device. In the figure. Center hub spintle drive pin flange hole flange chuck plate dowel 4.11: long hole 10a: collar 12: recess 13: springs 14a, 14b: pin 15 guide pin

Claims (1)

[Claims] a flange having ferromagnetic material on both sides and fixed to the spindle and on which a storage medium on a disk is written; a drive pin that protrudes from the flange and rotates the storage medium; and a drive pin that is partially engaged with the flange. an annular support member that is swingably superimposed on the flange while fixing the engagement member and the drive pin facing each other with the spindle at the center; In the disk chucking mechanism, the disc chucking mechanism includes a biasing means for biasing toward the spindle side when viewed from the mounting member, and a guide means for restricting movement of the support member in the circumferential direction is provided between the flange and the support member. A disc chucking mechanism characterized by being provided in between.