JPH0718045Y2 - Disk holder - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floppy disk device, and more particularly to a disk holding base for holding and rotating a flexible magnetic disk having a disk hub made of metal.

[0002]

2. Description of the Related Art As a conventional disk holding base of a floppy disk device using a flexible magnetic disk having a disk hub made of metal, there is, for example, one shown in FIG.

In FIG. 5, a disk holding base 1 is formed by cutting a metal into a disk shape, and has a central shaft hole 1a and a shaft hole 1a.
An elliptical opening 1b is provided at a position spaced apart from, and an annular groove 1c is provided on the disk mounting surface side, and a rubber magnet 2 is fixed in the annular groove 1c with the opening 1b exposed. .

Next, on the lower surface side of the disk holding base 1, a bearing 4 which fits into a hole provided at an eccentric position of a disk hub (not shown) and a pin 5 which is a shaft of the bearing 4 are supported to mount the bearing 4. The support spring plate 3 is provided at three positions P1 while supporting it in a state of protruding from the opening 1b and providing the notches 3a and 3b so that the bearing 4 bends in the central axis direction.
The disc holding base 1 is constructed by fixing the shafts 1 and 2 at P2 and P3, and press-fitting and fixing the shaft 6 serving as the motor shaft in the shaft hole 1a.

[0005]

However, in such a conventional disk holding base, in forming the disk holding base 1, a cutting process or a polishing process of the shaft hole 1a, the opening 1b, the annular groove 1c, etc., A lot of steps are required for attaching the rubber magnet 2, which causes a problem of high cost.

Further, since the support spring plate 3 is easily bent, the bearing 4 is likely to be inclined, and when the bearing is brought into contact with the hole provided in the disk hub in an inclined state, the disk hub is deformed or the track position of the disk is displaced. There was a problem.

In view of the above problems, the main object of the present invention is to provide a disk holding base which can simplify the manufacturing process.

Another object of the present invention is to provide a disk holding base which is less likely to cause a track position deviation of the disk.

[0009]

SUMMARY OF THE INVENTION The present invention relates to a disk holding base of a floppy disk device using a flexible magnetic disk having a disk hub made of metal, the disk holding base being made of a plastic magnet and radially. Magnetized so that the magnetic poles alternate,
Also, a circular protrusion is provided in the center of the upper surface so that the disc hub comes into contact with the circular protrusion region, and a lever is provided on the lower surface side of the disc holding base and is perpendicular to one end of the lever. A drive roller that is erected upright, and the drive roller is configured to project upward through an opening provided in the disk holding table outside the circular protrusion, and the projecting drive The roller is configured to be fitted in a hole provided at an eccentric position of the disc hub.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of the present invention, in which a disk holding base 10 is integrally formed by a plastic magnet with a shaft 11 serving as a motor shaft by insert molding.
The lever 12 is attached to the lower surface side in a state where one end is rotatably supported by the pin 14 to the disk holding base 10 and is urged outward from the center of the disk holding base 10 by the spring 13.
At the free end of the lever 12, a driving roller 15 is provided with a roller shaft 16
It is rotatably fixed by and is arranged so as to project upward from an opening 10a provided in the disk holding table 10.
Reference numeral 17 is a Teflon tape formed in a circular shape so as to improve sliding with the disk hub.

2 (a) and 2 (b) show a disk holding table 1
0 shows a top view and a bottom view of the state in which the lever 12 and the drive roller 15 are attached to the lever 0.
Is pivotally supported on the lower surface of the disk holding table 10. The spring 13 connects the lever 12 to the disk holding table 1
It is for pressing the pin to 0 and for urging the pin 14 to rotate to the outside of the disk holding base 10. The spring 13 is a hairpin-shaped bent portion 13-
1 and a bent portion 13a, one end of which is a disk holding table 10
, And the other end is locked to the turning end bent locking part 12a of the lever 12. By this,
The spring 13 is mounted on the disk holder 1 via the lever 12.
The drive roller 15 mounted so as to project upward from the 0-th hole 10a is pressed to the outside of the disk holding base 10.
Since the spring 13 is also bent obliquely upward in the vicinity of the bent portion 13a, the lever 12 keeps the disk holding base 1 at all times.
It is pushed to 0. As a result, the drive roller 15
Is rotatable about a pin 14 via a lever 12 and is vertically movable.

Next, FIG. 3 is a sectional view taken along the line AA of the disk holding base 10 shown in FIG. 2A, and the engagement between the disk holding base 10 and the shaft 11 is as shown in the drawing. , Axis 11
The groove 11a is provided in the engaging portion with the disk holding base 10 and the knurl 11b is provided along the groove 11a.
The disc holder 10 is formed by insert molding with a plastic magnet on the disc holder 1.
0 is fixed to the shaft 11 firmly. or,
A circular protrusion 10c having a slight step is formed in the center of the periphery of the shaft 11 of the disk holding base 10, and a circular Teflon tape 17 is attached thereto.

Further, FIG. 4 is a plan view showing a magnetized state of the disk holding base 10 according to the present invention. As shown in the drawing, the disk holding base 10 formed of a plastic magnet has magnetic poles radially from around the central axis. Circular projections 1 having a step difference, which are magnetized to form magnetizing patterns 18 which are alternately magnetized.
At 0c, the disk hub is evenly attracted.

The disk holding table 10 made of such a plastic magnet is compared to the disk holding table 10 made of a combination of the disk holding table 1 and the rubber magnet 2 which require cutting, drilling and polishing steps as shown in FIG. The manufacturing process is significantly shortened, and the assembly process is also significantly reduced, which not only has a great effect in terms of productivity improvement, but also attracts the disk hub by attraction as compared with the attraction by the rubber magnet 2. The characteristics can be made uniform, and the processing accuracy of the disk holding table can be kept uniform. Moreover, in the present invention, since only the circular protrusion 10c region is adsorbed to the disc hub, the disc hub only needs to consider the processing accuracy of only the contact region with the circular protrusion 10c, and the disc hub can be molded. It will be easy.

The circular protrusion 10 is attached to the disk hub.
In the case of a structure in which only the c region is in contact, the drive roller 15 is in contact with the disk holding base 10 and the disk hub that are separated by the thickness of the circular protrusion 10c, and the drive roller 15 is If there is a tendency to tilt, a stress that deforms downward or upward is applied to the disk hub that is in contact with the tilted drive roller 15 during rotational driving, which causes a track position shift. is there. On the other hand, in the present invention, since the drive roller 15 is erected vertically with respect to the lever 12, the above problems do not occur. That is, in the disk holding table 10 of the present invention, the drive roller 15 is erected vertically to the lever 12 and is displaceable in the direction of the shaft 11 by displaceable by the lever 12. Unlike the case where only the top is displaced in an inclined shape due to the bending of the support spring plate 3, the constant displacement of the disk hub can be maintained because the disk hub drive hole can always be kept in a constant contact state. It

Further, the lever 1 for supporting the drive roller 15
Reference numeral 2 denotes a rigid lever made of metal or the like having rigidity, which does not cause displacement (tilt) of the disk holding base 10 in the anti-rotation direction. Therefore, when the disk is held by the head and the pad and rotated, the pad is pushed. When the pressure is strong, the disc is pulled in the counter-rotational direction and the disc is displaced rearward, which causes the drive roller 15 to move.
It is possible to prevent the occurrence of an error due to the initial displacement of the disk due to the disk being displaced in the counter-rotational direction and rotating in the displaced state.

[0017]

According to the present invention, since the disk holding base is made of a plastic magnet, the manufacturing process can be greatly shortened and the assembling process can be shortened, so that the cost-effective disk holding base is provided. .

Further, in the present invention, since the magnetized pattern can be formed in the entire area of the disk holding base except the outer peripheral portion, the attraction characteristic for the disk hub can be improved and only the circular projecting area can be formed. By making it adhere to the disk hub, it is only necessary to consider the processing accuracy of the disk hub in the contact area with the circular protrusion, so the molding error can be widened and the disk hub molding process is easy. Becomes Since the drive roller can be evenly engaged with the disk holding base and the disk hub that are separated from each other by the thickness of the circular protrusion without always inclining, unnecessary deformation force is applied to the disk hub. It is possible to prevent the action, and it is possible to reliably prevent the displacement of the track due to the driving roller and the holding member thereof.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is a view of the disk holding table shown in FIG. 1 viewed from the upper surface side and the lower surface side.

FIG. 3 is a cross-sectional view taken along the line AA of the disk holding table shown in FIG.

FIG. 4 is a diagram showing an example of a magnetization pattern on a disk holding table.

FIG. 5 is an exploded perspective view of a conventional disk holding base.

[Explanation of symbols]

 10 Disc Holding Base 10a Opening Hole 11 Shaft 12 Lever 13 Spring 15 Drive Roller

Claims (1)

[Scope of utility model registration request] 1. A disk holding base of a floppy disk device using a flexible magnetic disk having a disk hub formed of metal, the disk holding base being made of a plastic magnet, and radially extending over the entire area thereof. Adhesion of a tape that is magnetized so that the magnetic poles alternate, and that improves the sliding with the disk hub at the center of the top surface.
Has been said disk hub magnetized region of the circular projection has a circular protrusion are in so that the mounting, the lower surface of the disc holder together with a lever, perpendicular to the one end of the lever A drive roller installed upright on the drive roller, and the drive roller is configured to project upward through an opening provided in the disk holding base outside the circular protrusion.
Moreover, the disc holding table is characterized in that the projecting drive roller is configured to be fitted into a hole provided at an eccentric position of the disc hub.