JPH0356909Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a magnetic disk drive device for recording or reproducing signals using a microfloppy disk or a similar magnetic disk cartridge.

Prior Art A magnetic disk cartridge 1, generally called a microfloppy disk, shown in FIGS. 1 to 4 is constructed by housing a recording medium disk 2 with a diameter of 86 mm in a rigid synthetic resin case 3. has been done. Head insertion openings 6 and 7 are provided on both the front surface 4 and back surface 5 of the case 3, and these openings 6 and 7 are closed by a sliding shutter 8 when not in use. Shutter 8 is the first
It is biased by a spring (not shown) in the right direction in the figure, and when in use, the shutter 8 is moved to the left against this biasing force. The shutter 8 is opened by placing an opening member (not shown) in the recess 9 of the case 3 and pressing the side surface of the shutter 8 with the opening member (not shown). Disk cartridge 1 of this embodiment
The disk 2 consists of a magnetic sheet 2a and a hub 2b made of a metal disk mounted at the center of the magnetic sheet 2a. Since the disk 2 is not rotated by being pressed by a clamper, an opening 10 for rotational driving is provided only on the back surface 5 of the case 3, and the hub 2b is exposed from the opening 10. This hub 2b is provided with a spindle insertion hole 2c and a drive pin insertion hole 2d. The mechanism for rotationally driving the disk 2 for recording or reproducing using the disk cartridge 1 formed in this manner is as shown in FIG. A drive pin 13 is provided at a position adjacent to this,
Furthermore, a permanent magnet 14 for attracting the magnetic metal hub 2b at the center of the disk 2 is fixedly arranged on the rotary table 11.

When recording or reproducing, the hub 2b of the disk 2 is placed on the rotary table 11, and the spindle 12 and drive pin 13 are inserted from below the disk 2 as shown in FIG. At this time, spindle 1
2 is inserted into the spindle insertion hole 2c of the hub 2b, and the drive pin 13 is inserted into the drive pin insertion hole 2d. Note that since the drive pin 13 is supported by a spring member so as to be movable in the axial direction, the drive pin 13 is first moved in the hole 2d.
When it does not engage, it is pressed downward by the hub 2b, but when it aligns with the hole 2d, it protrudes upward by the force of the spring and completely engages with the hole 2d.

By the way, in order to smoothly rotate the disk 2 by the drive pin 13, it is conceivable to configure the drive pin 13 with a ball bearing. but,
Ball bearings are expensive. In order to solve this drawback, it is possible to use a bearing metal, but since the bearing metal is made of metal impregnated with oil, it is subject to heavy wear and is not practical.

Purpose of the Invention It is therefore an object of the present invention to provide a magnetic disk drive device that is capable of suppressing deterioration in performance, is easy to assemble, and can reduce costs.

Structure of the Invention To achieve the above object, the present invention will be explained with reference to the reference numerals in the drawings showing the embodiments. magnetic sheet 2
A spindle 12 is inserted into the spindle insertion hole 2c, and a drive pin insertion hole 2d is inserted into the drive pin insertion hole 2d in order to rotationally drive the disk 2 of the magnetic disk cartridge 1 containing the recording medium disk 2 consisting of the In a magnetic disk drive device including a drive pin 13 to be inserted, and a turntable 11 supporting the spindle 12 and the drive pin 13, the drive pin 13 is connected to the turntable 11.
an oil-impregnated bearing ring 17 made of oil-impregnated metal or oil-impregnated synthetic resin and arranged so as to surround said shaft 15 and rotatably attached to said shaft 15; and said oil-impregnated bearing ring 17. An outer ring 18 made of a highly hard and wear-resistant material is arranged to surround the oil-impregnated bearing ring 17 and is fixed to the oil-impregnated bearing ring 17, and a dust intrusion prevention ring 1 is arranged to cover the oil-impregnated bearing ring 17.
9. The present invention relates to a magnetic disk drive device characterized by having the following features.

Effects of invention The present invention has the following effects.

(a) An outer ring 18 made of a highly hard and wear-resistant material is placed on the outside of the oil-impregnated bearing ring 17 made of oil-impregnated metal or oil-impregnated synthetic resin, and a dust intrusion prevention ring 19 is placed above the oil-impregnated bearing ring 17. Therefore, the recording medium disk 2 can be driven smoothly and stably for a long period of time.

(b) The drive pin 13 is connected to the shaft 15 and the oil-impregnated bearing ring 1.
7, outer ring 18, and dust intrusion prevention ring 1
9, the structure is simpler and easier to assemble than the conventional drive pin using a ball bearing, and costs can be reduced.

Embodiment Next, a magnetic disk drive device according to an embodiment of the present invention shown in FIGS. 6 and 7 will be described. This device rotationally drives the disk 2 of the disk cartridge 1 shown in FIGS. 1 to 4, and similarly to the disk rotation mechanism shown in FIG. 5, a spindle 12 is fixed to a disk rotating table 11. Moreover, it is constructed by providing a drive pin 13 and a magnet 14. However, the specific configuration of the drive pin 13 is different from the conventional one, and is configured as shown in FIG.

In FIG. 8, reference numeral 15 denotes a metal shaft, which is fixed to a leaf spring 16 supported by the rotary table 11. As shown in FIG. Reference numeral 17 denotes a highly slippery bearing ring made of oil-less metal (bearing metal), that is, oil-impregnated metal, and is rotatably mounted on shaft 15 .
An outer ring 18 is made of stainless steel, which is a highly hard and wear-resistant material, and is fixed to the outer peripheral surface of the bearing ring 17. 19 is a ring for preventing dust intrusion, and is arranged on the bearing ring 17.

As shown in FIG. 7, the leaf spring 16 that supports the drive pin 13 has an arcuate portion 16a, a support portion 16b extending in the radial direction, and a fixed portion 16c fixed to the rotary table. It is formed to allow downward displacement of. In addition, the turntable 11
The lower surface of the housing serves as an upper stopper, and the lower fixing member 21 serves as a lower stopper.

The magnetic disk 2 is attached to the rotary drive device constructed as described above in the same manner as in the prior art. That is,
The disk 2 is placed on the rotary table 11, the hub 2b is attracted by the magnet 14, and the rotary table 11 is rotated by the motor 20. If the drive pin 13 is not aligned with the hole 2d, the drive pin 13 is pressed downward by the hub 2b, is displaced together with the leaf spring 16, and when it is aligned with the hole 2d, returns to the direction by the force of the leaf spring 16, and the hole 2d. After engagement, the disk 2 is driven to rotate with the outer ring 18 of the drive pin 13 in contact with the edge of the hole 2d.

As is clear from the above, this embodiment has the following advantages.

(A) Since the bearing ring 17 made of oil-free metal is arranged around the outer periphery of the shaft 15, the engagement between the hub 2b and the drive pin 13 can be maintained well despite being inexpensive.

(B) Since the ring 18 having high hardness and wear resistance is arranged outside the bearing ring 17, the durability of the drive pin 13 is high.

(C) Since the ring 19 for preventing dust intrusion is provided, it is possible to prevent the performance of the drive pin 13 from deteriorating due to dust.

(D) Since the leaf spring 16 is provided with the arcuate portion 16a and the radially extending portion 16b, the pin 13 can be moved downward while maintaining good parallelism to the spindle 12.

Modifications The present invention is not limited to the above-described embodiments, and, for example, the following modifications are possible.

(a) The ring 17 may be made of oil-containing synthetic resin.

(b) Of course, it is also applicable to magnetic disks other than 86 mm.

(c) The shape of the leaf spring 16 may be modified in various ways. In addition, if the hole 2d and the drive pin 13 can be aligned by some method, the leaf spring 16
may be omitted.

[Brief explanation of the drawing]

Figure 1 is a plan view of a magnetic disk cartridge.
Fig. 2 is a bottom view of the cartridge shown in Fig. 1, Fig. 3 is a plan view of the cartridge shown in Fig. 1 with the shutter opened, Fig. 4 is a front view of the cartridge shown in Fig. 1, and Fig. 5 is a top view of the cartridge shown in Fig. 1. FIG. 6 is a plan view showing a conventional disk drive device, FIG. 6 is a partially cutaway front view showing a disk drive device according to an embodiment of the present invention, and FIG. A plan view showing,
FIG. 8 is an enlarged sectional view of the drive pin of FIG. 6. 1... Disk cartridge, 2... Disk, 2a... Magnetic sheet, 2b... Hub, 2c...
...Spindle insertion hole, 2d...Drive pin insertion hole,
11... Turntable, 12... Spindle, 13...
Drive pin, 14... Magnet, 15... Axis, 16...
Leaf spring, 17...Bearing ring, 18...Outer ring, 19...Dust intrusion prevention ring, 20...Motor.

Claims (1)

[Claims for utility model registration] Spindle insertion hole 2c and drive pin insertion hole 2d
In order to rotationally drive the disk 2 of the magnetic disk cartridge 1 in which a case 3 houses a recording medium disk 2 consisting of a hub 2b having a hub 2b and a magnetic sheet 2a attached to the hub 2b, a hole is inserted into the spindle insertion hole 2c. Spindle 12 inserted
, the drive pin 13 inserted into the drive pin insertion hole 2d, the spindle 12 and the drive pin 1.
3, the drive pin 13 is arranged so as to surround a shaft 15 supported by the rotary table 11, and the shaft 15; An oil-impregnated bearing ring 17 made of oil-impregnated metal or oil-impregnated synthetic resin is rotatably mounted on the oil-impregnated bearing ring 17, and a highly hard and wear-resistant bearing ring 17 is arranged to surround the oil-impregnated bearing ring 17 and is fixed to the oil-impregnated bearing ring 17. A magnetic disk drive device comprising an outer ring 18 made of material and a dust intrusion prevention ring 19 disposed to cover the oil-impregnated bearing ring 17.