JPH1083603A - Disk chucking mechanism of disk unit - Google Patents

Abstract

(57) [Problem] To provide a disk chucking mechanism capable of reducing the number of parts. A fulcrum is provided on the back side of a disk holding table.
The support member 13 rotatably mounted around a
The drive roller 16 is supported at the free end side in a state of protruding from the opening 11a. The support member 13 includes a support body 131 that supports the drive roller 16 and a fulcrum 14a of the support body 131.
And a spring portion 132 provided along the side end.
The spring portion 132 urges the drive roller 16 radially outward of the disk holding base 11 around the fulcrum 14a. The disk holding base 11 has a projection 11c on its rear surface for locking the tip 132a of the spring part 132. Spring part 132
Is free when not locked by the projection 11c.
1c than the position locked by 1c
Is bent radially outward.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a disk device such as a floppy disk device for writing and reading data to and from a magnetic disk medium of a floppy disk, and more particularly to a disk device such as a floppy disk. The present invention relates to a disk chucking mechanism for chucking a disk for rotational driving while rotating.

[0002]

2. Description of the Related Art As is well known, a floppy disk device is a drive unit for writing and reading (recording and reproducing) data on a magnetic disk medium of a floppy disk inserted therein. In order to record and reproduce such data, it is necessary to rotate the disk while holding the floppy disk. for that purpose,
You need to chuck the floppy disk. Such a mechanism for chucking a floppy disk is called a disk chucking mechanism.

Before describing the disk chucking mechanism, a floppy disk will be described. The floppy disk is a recording medium for recording and reading data magnetically on a thin disk coated with a magnetic material, and is contained in a square case made of plastic. Floppy disks are also called flexible disks or diskettes.

FIG. 2 is a plan view of the floppy disk 40 chucked by the disk chucking mechanism as viewed from the back side. Floppy disk 4 shown
Numeral 0 is 3.5 inches in size, and has a magnetic disk medium 41 as a magnetic recording medium and a case 42 that covers the magnetic disk medium 41. The case 42 is made of plastic and has a square shape. A circular opening 42a is opened at the center of the back side of the case 42.
A disk hub 43 for holding the magnetic disk medium 41 passes through the circular opening 42a. The disk hub 43 is a disk-shaped metal fitting made of a ferromagnetic metal. The disk hub 43 has a disk center hole 43a at the center thereof and a driving slot 43b at a position eccentric from the disk center hole 43a. The disk center hole 43a has a square shape, and a spindle shaft described later is fitted into the disk center hole 43a. A driving roller, which will be described later, passes through the driving slot 43b. The driving slot 43b is also called a chucking hole, and the drive roller is also called a chucking pin.

Incidentally, as an aside, the floppy disk 4
0 when viewed from the back, FIG.
A write protection hole (not shown) is formed in the right corner (left corner when viewed from the front side) at the rear end in the insertion direction indicated by arrow A. FIG. 2 shows a state in which the write protection hole is closed by a write protection tab 44.
The write protection tab 44 is slidable in the insertion direction A, and the write protection hole can be opened and closed by manually operating the tab. When the write-protection hole is closed by the write-protection tab 44, recording is possible,
When the write protection hole is opened, recording is disabled.

As will become clear later, when the floppy disk 40 is chucked, the drive roller (chucking pin) of the disk chucking mechanism is connected to the disk hub 4.
The third driving long hole (chucking hole) 43b is in contact with a radially outer corner 43b-1.

FIG. 3 shows a conventional disk chucking mechanism 10 'used for a floppy disk drive. The illustrated disk chucking mechanism 10 ′ includes a disk hub 4.
3 (FIG. 2) is provided with a disk holding table (disk table) 11. The disk holding base 11 has a disk shape having a diameter substantially equal to the diameter of the disk hub 43, and is made of a plastic magnet for magnetically attracting the disk hub 43. The disk holding base 11 has a spindle shaft 12 of a spindle motor (not shown) that is to be fitted into the disk center hole 43a from the center thereof. The disk holder 11 is formed integrally with the spindle shaft 12 by insert molding. Further, the disk holding base 11 has an opening 11a at a position eccentric from the center.

[0008] A support member 13 'is attached to the lower surface side of the disk holding base 11. One end of the support member 13 '
It is pivotally supported by the support pin 14 so as to be rotatable to the disk holding table 11. The free end of the support member 13 'is urged radially outward from the center of the disk holding base 11 around the fulcrum 14a of the support pin 14 by a rod-shaped spring 15'. A drive roller 16 is rotatably attached to a free end of the support member 13 ′ by a roller shaft 17. The height of the drive roller 16 is higher than the thickness of the disk holder 11. The drive roller 16 is disposed so as to protrude upward from an opening 11 a provided in the disk holding base 11. A circular Teflon tape 18 is placed on the circular protrusion 11b of the disk holding base 11. This Teflon tape 18 is for improving the slip with the disk hub 43 made of ferromagnetic metal, which is assembled to the floppy disk 40 shown in FIG.

The rod-shaped spring 15 'has a tip 15-1.
Engages with one end 13-1 'on the free end side of the support member 13' so that the free end (drive roller 16) of the support member 13 'is 11 is urged to rotate outward in the radial direction. Further, the rod-shaped spring 15 'has an intermediate portion 15'-
2, the free end (drive roller 16) of the support member 13 'is urged upward by bending the tip 15-1' side upward.

Next, referring to FIG. 4 in addition to FIG. 3, the operation of the disk chucking mechanism 10 'when chucking the floppy disk 40 to the disk hub 43 will be described. FIG. 4 is a plan view showing the floppy disk 40 (FIG. 2) at the time of chucking without the case 42 thereof. When the floppy disk 40 is inserted into the floppy disk device, the floppy disk 40
The disk hub 43 is magnetically attracted by the disk holding base 11. At this time, the spindle shaft 12 is fitted into the disk center hole 43a. On the other hand, as shown by the solid line in FIG.
b. However, since the proportion of the area occupied by the drive long hole 43b in the disk hub 43 is small, in most cases, the drive hub 43 will come into contact with the disk hub 43 without loosely penetrating into the drive long hole 43b. Even if the drive roller 16 is in contact with the disk hub 43,
As the disk holding table 11 is rotated by the spindle motor, the driving roller 16 is freely inserted into the driving long hole 43b. After being freely penetrated into the driving slot 43b, the rotation of the disk holding table 11 by the spindle motor causes the driving roller 16 to rotate radially outward at the corner of the driving slot 43b as shown by the dotted line in FIG. 43b-1. In this manner, the disk hub 43 of the floppy disk 40 is chucked on the disk holder 11.

[0011]

In the conventional disk chucking mechanism 10 'described above, the support member 13' has only the function of supporting (holding) the drive roller 16 at its free end. That is, in order to rotate the drive roller 16 radially outward from the center of the disk holding base 11 or to urge the drive roller 16 upward, a rod-shaped spring 15 ′ is required as a component separate from the support member 13 ′. Therefore, there is a problem that the number of parts increases.

In view of the above problems, an object of the present invention is to provide a disk chucking mechanism for a disk drive that can reduce the number of components.

[0013]

A disk chucking mechanism according to the present invention is for chucking a ferromagnetic metal disk hub provided at a central portion of a disk rotated and driven by a disk device. . The disc hub has a disc center hole at the center and a driving slot at a position eccentric from the center hole.

The disk chucking mechanism according to the present invention is a disk holding table for holding a disk hub, which is made of a plastic magnet for magnetically attracting the disk hub, and is fitted into the disk center hole from the center. A disk holder having a spindle shaft to be erected, an opening at a position corresponding to the drive slot eccentric from the center, a chucking pin loosely inserted into the drive slot, and a disk holder. A support member rotatably mounted on the back surface side around a fulcrum, and supporting the chucking pin at the free end side in a state protruding from the opening. The support member includes a support body that supports the chucking pin, and a spring portion that is provided along an end on the fulcrum side of the support body and urges the chucking pin radially outward of the disk holding base around the fulcrum. Having. The disk holder has a locking portion on the back side for locking the tip of the spring portion. When the spring portion is not locked by the locking portion, the spring portion is bent outward in the radial direction of the disk holder from a position locked by the locking portion.

[0015]

The supporting member for supporting the chucking pin comprises a supporting body for supporting the chucking pin, and a spring provided along the end of the supporting body on the fulcrum side. No urging means such as a rod spring is required.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to FIG.

In FIG. 1, (a) and (b) are perspective views of a disk chucking mechanism 10 according to the present invention as viewed from obliquely below and obliquely above, respectively. The illustrated disk chucking mechanism 10 is a disk chucking mechanism for chucking a ferromagnetic metal disk hub 43 provided at the center of a disk 40 (FIG. 2) driven to rotate by a disk device. And FIG.
Those having the same functions as those described above are denoted by the same reference numerals,
Their description is omitted for simplification of the description.

The conventional disk chucking mechanism 10 'shown in FIG. 3 and the disk chucking mechanism 1 according to the present invention.
0 is different from the conventional disk chucking mechanism 10.
′, The bar-shaped spring 15 is provided as a separate component from the support member 13 ′.
In contrast, the disk chucking mechanism 10 according to the present invention has a configuration in which the plate-shaped support member 13 is integrated with the support main body 131 and the spring portion 132.
The spring 132 extends along the end of the support body 131 on the support pin 14 side substantially inside the disk holding base 11 in a direction perpendicular to the direction in which the support body 131 extends.

The tip portion 132a of the spring portion 132 is locked by a projection 11c projecting from the back surface of the disk holding base 11. At the time of being free from being locked by the projection 11c, the spring portion 1
As shown by a dotted line in FIG. 1A, the distal end portion 132a of the 32 is bent outward in the radial direction of the disk holding base 11 from a position locked by the projection 11c. In the disk chucking mechanism 10 having such a structure, the drive roller 16 (the free end of the support member 13) is supported by the spring portion 132 of the support member 13 as shown by an arrow x in FIG.
The disk holder 11 is urged to rotate outwardly in the radial direction of the disk holder 11 around 4a.

In this embodiment, the support body 131 of the support member 13 has a spring property and supports the drive roller 16 movably in the vertical direction. In other words, the support body 131
Has flexibility in the vertical direction. Therefore, the support main body 131 of the upward support member 13 with respect to the drive roller 16 is provided.
Is very small as compared with the conventional case where the supporting member 13 'is urged by the bar spring 15'. This urging force can be controlled by adjusting the thickness of the support member 13. Since the urging force of the support body 131 of the support member 13 is small as described above, even if the drive roller 16 abuts on the disk hub 43 during chucking of the floppy disk 40 to the disk hub 43, the disk hub 43 is not damaged. Can be prevented.

The support member 1 is positioned on a line L connecting the fulcrum 14a of the support pin 14 and the drive shaft 16a of the drive roller 16.
There are three support bodies 131. The plate width of the support body 131 is increased from the drive roller 16 side to the fulcrum 14a side of the support pin 14. With such a structure, the support main body 131 of the support member 13 itself can be prevented from being distorted, and the tilting of the support main body 131 during chucking of the floppy disk 40 with respect to the disk hub 43 can be prevented. it can. In other words, the support main body 131 can stably hold the drive roller 16.

The present invention is not limited to the above embodiment,
Various changes can be made without departing from the gist of the present invention. For example, the present invention is not only applied to a floppy disk device for accessing a floppy disk, but also to other disk devices. Further, the chucking pin is not limited to a driving roller rotatably supported by the support member. Further, it is needless to say that the locking portion for locking the tip of the spring portion is not limited to the protrusion protruding from the back surface of the disk holding base.

[0023]

As described above, according to the present invention, since the plate-like support member is formed integrally with the support body and the spring portion, the number of parts can be reduced.

[Brief description of the drawings]

FIGS. 1A and 1B are diagrams showing a disk chucking mechanism according to an embodiment of the present invention, wherein FIG. 1A is a perspective view as viewed obliquely from below, and FIG. 1B is a perspective view as viewed obliquely from above.

FIG. 2 is a plan view of a floppy disk chucked by a disk chucking mechanism as viewed from the back side.

FIG. 3 is an exploded perspective view showing a conventional disk chucking mechanism.

FIG. 4 is a plan view showing a floppy disk at the time of chucking without its case.

[Explanation of symbols]

 Reference Signs List 10 Disk chucking mechanism 11 Disk holding table (disk table) 11a Opening hole 11c Projection (locking part) 12 Spindle shaft 13 Support member 131 Support body 132 Spring part 14 Support pin 14a Support point 16 Drive roller (chucking pin) 16a Drive shaft 17 Roller shaft 40 Floppy disk 41 Magnetic disk medium 43 Disk hub 43a Disk center hole 43b Drive long hole (chucking hole)

Claims (3)

[Claims] 1. A disk chucking mechanism for chucking a ferromagnetic metal disk hub provided at a central portion of a disk rotationally driven by a disk device, wherein the disk hub has a disk center at a central portion. The disk chucking mechanism has a hole and a driving slot at a position eccentric from the disk center hole, and the disk chucking mechanism is a disk holding table for holding the disk hub, and magnetically attracts the disk hub. A disk shaft that is formed from a plastic magnet and that has a spindle shaft to be fitted into the disk center hole from the center and has an opening at a position corresponding to the drive slot eccentric from the center. A chucking pin loosely inserted into the driving slot; and a pivot about a fulcrum on the back side of the disc holding base. A supporting member that is supported at a free end side in a state where the chucking pin is protruded from the opening, wherein the supporting member supports the chucking pin; A spring portion that is provided along an end on the fulcrum side and biases the chucking pin radially outward of the disk holding pedestal around the fulcrum; A locking portion for locking a tip portion of the spring portion. When the spring portion is not locked by the locking portion in a free state, the disk holding table is positioned higher than a position locked by the locking portion. A disk chucking mechanism for a disk device, which is bent radially outward. 2. The device according to claim 1, wherein the chucking pin is a drive roller rotatably supported on the support body.
A disk chucking mechanism for a disk device according to claim 1. 3. The disk drive according to claim 1, wherein when the spring portion is free to be locked by the locking portion, a distal end of the spring portion protrudes from an outer peripheral end of the disk holding base. A disk chucking mechanism of the disk device according to any one of the preceding claims.