JPS6038753A - Magnetic disk driver - Google Patents

Abstract

PURPOSE:To attain the miniaturization of a magnetic disk driver by constituting simply where a collet supporter having a contact with a projected part on the rear side of a front panel through the front edge and having a collect attached at another end respectively is actuated over a cassette holder via a plate spring. CONSTITUTION:A cassette holder 3 containing a cassette can move up and down along a guide hole 13 formed on the side face of a chassis 8. A bent projection 14 is formed at the front center on the upper surface side of the holder 3. This projection 14 is put into a slit 20 of a collet supporter 17, and the supporter 17 is actuated with the slit 20 defined as a fulcrum. When no cassette is loaded, a collet 15 attached at the tip of the supporter 17 is held higher than the upper surface of the holder 3 with the slit 20 defined as a fulcrum. While the holder 3 falls when a cassette is loaded. Therefore a proper load is applied to a hub at the center of a magnetic disk from a plate spring 16 via the collet 15.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a magnetic disk drive device, and more particularly to a magnetic disk drive device with a hub holder and collet device suitable for downsizing the device.

[Background of the invention]

The conventional configuration will be explained with reference to FIGS. 1 and 2, which show the conventional example when the cassette is not inserted and when it is inserted.

A cassette storage body 3 holding a cassette 2 containing a magnetic disk 1 has a collet 5 attached to a hub pressing spring 6 for pressing a hub 4 provided at the center of the magnetic disk 1 during installation.

When the cassette 2 is inserted and ejected, the cassette storage body 3 moves along the lower surface of the cassette storage body 3 without contacting the collet 5, and the cassette storage body 3 falls along the guide hole on the side.
When the hub 4 is attached to the knob holder 7, the cassette 2
is attached to the upper surface of the cassette storage body 3 that has been moved downward, so that the hub pressing spring 6 is displaced upward and the hub 4 is moved downward.
The pressing was configured so that force was applied to it.

Therefore, the dimension in the height direction of the cassette storage body 3 requires a gap H so that the cassette 2 does not come into contact with the collet 5 when inserted or ejected, and as miniaturization is desired,
This miniaturization could not be achieved.

No. 1, there was a drawback that even if there were dimensional variations or the hub holding spring 6 was slightly deformed, something could come into contact with the collet 5 and get caught when inserting or ejecting the cassette 2.

[Purpose of the invention]

It is an object of the present invention to provide a magnetic tisf drive device which eliminates the drawbacks of the prior art described above and which is miniaturized by a simple fEj configuration.

[Summary of the invention]

The configuration of the magnetic disk drive device according to the present invention includes a drive device that rotationally drives a magnetic disk, a magnetic head that writes to and reads from the magnetic disk, a hub holder at the tip of the drive device, and a cassette In a magnetic disk drive device in which a cassette storage body is mounted, a collet support whose front end can be brought into contact with a protrusion on the back side of the front panel and a collet is attached to the other end is mounted on the top of the cassette storage body. When inserting a cassette, the collet support and the engaging part provided on the cassette storage body are used as fulcrums via a leaf spring fixed to the body.

The collet is arranged so that it can be moved up and down when not inserted.

As an additional note, the present invention provides that, on the upper part of the cassette storage body,
A collet support with its front end in contact with the protrusion on the back side of the front panel and a collet attached to the other end is inserted into the bending protrusion via a leaf spring fixed to the cassette storage body, and operates using the slit as a fulcrum. That's how it is.

[Embodiments of the invention]

An embodiment of the magnetic disk drive device according to the present invention will be described in the third embodiment.
This will be explained with reference to FIGS. 8 to 8.

Here, FIG. 3 is a sectional view of the magnetic disk and drive device according to an embodiment of the present invention when the cassette is not inserted, FIG. 4 is a sectional view of the magnetic disk when the cassette is inserted, and FIG. 5 is a sectional view of the drive device. FIG. 6 is a top plan view, FIG. 6 is an exploded perspective view of the front panel, FIG. 7 is a detailed explanatory view of the return spring, and FIG. 8 is an exploded perspective view of the main parts.

In the figure, the same reference numerals as in FIGS. 1 and 2 indicate equivalent parts.

That is, first, in FIGS. 3 to 5, 8 is a chassis to which various parts of the apparatus are attached. 9 is a boss formed integrally with the chassis 8, and this boss 9
A housing 11 that supports a drive device 10 for rotating the magnetic disk 1 housed in the cassette 2 is attached to the inner diameter side of the cassette 2 .

A magnetic disk 1 is mounted on a shaft 12 directly connected to the drive device 10.
A hub receiver 7 is provided on which a hub 4 provided at the center is placed. The magnetic disk 1 is fixed to the knob 4,
It is configured to be attached to the tip of the shaft 12 and centered.

The cassette storage body 3 into which the cassette 2 is inserted is placed in the chassis 8
A guide hole 13 (Fig. 3) provided on the side surface of the cassette storage body 3 is configured to be movable up and down. A leaf spring 16 for applying an appropriate load to the hub 4 at the center of the disk 1 is fixed to the cassette storage body 3 by crimping or welding using the bending protrusion 14 as a guide.

Furthermore, as detailed in FIG. 8, a collet support 17 is provided on the upper part of the leaf spring 16, and a collet 15 is attached to one end of the collet support 17, and at the same time, a collet support 17 is provided near the collet support 17. The leaf spring 16 is attached to the leaf spring hook part 18.
hook the end 19 of the cassette storage body 3 into the bent protrusion 1
It is supported by inserting a slit 20 provided at a position corresponding to 4 into the bending protrusion 14.

Therefore, since the load acting on the collet 15 of the leaf spring 16 acts on the leaf spring hook portion 18 near the collet 15, the spring constant of the leaf spring 16 can be reduced.
This allows the pressing force applied to the collet 15 to be constant.

The other end of the collet support 17 is configured to be received under a support part 23 provided above the cassette insertion slot 22 on the back side of the front panel 21 attached to the front of the apparatus.
and is supported by a slit 20 inserted into the bending protrusion 14.

In this configuration, when the cassette 2 is not inserted as shown in FIG. The collet 15 is in contact with the support part 23 and is attached to the tip of the collet support 17.
For example, the cassette housing 3 is lifted up using the slit 20 as a fulcrum against the spring force of a leaf spring 16 attached to the cassette storage body 3.

When lifted, the lower surface of the collet 15 is set to be lifted above the upper surface of the cassette storage body 3.

Therefore, even if the height dimension of the cassette storage body 3 is set to be approximately the same as the thickness of the cassette 2 on the inside, the cassette 2 will not come into contact with the collet 14 when inserted.

Next, as shown in FIG. 4, when the cassette 2 is inserted into the cassette housing 3, the eject plate 240 is unlocked, the cassette housing 3 falls downward, and the magnetic disk 1 is released. At the same time that the block 4 is attached to the block holder 7, the front end of the collet support 17 separates from the support part 23 of the front panel 21, so the collet 15, which had been lifted around the slit 20, is moved by the leaf spring 16. It is pressed against the knob 4 side and presses the hub 4 of the magnetic disk 1 against the hub receiver 7.

As shown in detail in FIG. 6, holes 26 are provided on both sides of the front panel 21 for attaching a door 25 to cover the cassette insertion slot 22 when the device is not in use.
A door spring 27 for giving elasticity to the door 25,
Pass through the insertion shaft 28 formed integrally with the door 25, and insert the door 2
5 is rotatably supported in the mounting hole 26 while being elastically deformed in the longitudinal direction.

Reference numeral 29 is a spring hook portion for preventing the door spring 27 from coming off.

Further, holding portions 32 for holding the front panel 21 by hooking into notches 31 of both side plates 30 formed integrally with the chassis 8 are integrally formed on both side surfaces.

If this front panel configuration method is adopted, a simple configuration of just providing the door 25 and the door spring 27 will be sufficient, and the first
Compared with the conventional door structure shown in FIGS. 1. In terms of design, there is a single door 25 with a cassette slot 22.
It can be made into an excellent product.

On the other hand, 33 is a carriage, and a lower magnetic head 34 for writing and reading data on the magnetic disk 1 is provided at the tip of the carriage 33.

An upper magnetic head 35 is provided at the tip of a head arm 36 in order to write and read data on both sides of the magnetic disk 1 by inserting the cassette 2 - times.

Normally, the centers of the read and write cores of the lower magnetic head 34 and the upper magnetic head 35 are shifted by eight tracks in the case of 100 TPi (100 tracks per inch).

Reference numeral 37 denotes a helad arm spring that applies an appropriate load when the upper magnetic head 35 is in close contact with the magnetic disk 1.

The carriage 33 and head arm 36 configured as described above are configured to be moved along a concentric recording band formed on the magnetic disk 1 via a steel belt 40 attached to a pulley 39 of a stepping motor 38. are doing.

Reference numeral 41 denotes a screw for attaching the steel belt 40 to the pulley 39, and the tip of the screw 41 is connected to the carriage from the location located on the outermost track and the innermost track recorded on the magnetic tape 1. 33 is made to hit the stopper 42 so that it does not deviate by more than two tracks.

During normal use, this is detected by the outermost track detection sensor 43, but if it is moved from the outermost track by more than two tracks in the outer circumferential direction during transportation, etc., it will move to the outermost track due to the characteristics of the stepping motor 38. This is because there is a risk that you will not be able to do so. This is to prevent the steel belt 40 from breaking if the ξ stepping motor 38 runs out of control for some reason.

Further, reference numeral 44 denotes a locking protrusion formed integrally with the chassis 8 and passing through the eject plate 24.

The eject plate 24 is provided with bent portions 46 on both sides of the locking protrusion 44 for locking the return spring 45.

The substantially central portion of the return spring 45 is bent to a curvature that substantially matches the diameter of the locking protrusion 44, and an arbitrary curvature 47 is given to both sides thereof to smoothly connect the central curved portion 48. Further, an arm 49 of an appropriate length is extended outside the curvature 47.

The return spring 45 having such a shape is made of elastic wire 42 or the like, and this return spring 45 snaps (or locks) the central curved portion 48 onto the locking protrusion 44 . Further, the upper part thereof is held down by a pull-out stopper 50 formed integrally with the chassis 8. After that, arm 49
is locked to a bent portion 46 provided on the eject plate 24, and depending on the locked state, the eject plate 24
is biased toward the front panel 21 side.

The eject plate 24 has a lock protrusion 51 and a stepped portion 52. When the cassette 2 is not inserted, the lock protrusion 51 is locked by the locking mechanism 53, and the stepped portion 52 is locked.
The pin 54 provided on the cassette storage body 3 is lifted up.

When the cassette 2 is not inserted into the magnetic disk drive device having such a configuration, the state shown in FIG. 3 is reached as described above.

The state of the return spring 45 at this time is from the no-load state A shown in FIG. 7 to the state C in which it is given maximum deflection. The lock protrusion 51 is locked by the lock mechanism 53, and the stepped portion 52 pushes up the pin 154.

When the cassette 2 is inserted into the cassette storage body 3, the lock mechanism 53 is unlocked by the cassette 2, and the eject plate 24 slides toward the front panel 21 by the restoring force of the return spring 45. At the same time, the stepped portion 52 also moves in the direction P in FIG. 3, so that the bottle 54 comes off the stepped portion 52 and falls, and is pressed downward by the inclined portion 55 of the eject plate 24.

After a series of such operations, the magnetic disk 1 is pressed against the hub receiver 7.

The state in which this magnetic disk 1 is pressed against the hub receiver 7 is the fourth state.
As shown in the figure, the return spring 45 is in the state shown in FIG.

Conventionally, two tension springs were used to slide the eject plate 24, but in this embodiment, it is possible to do this with just one wirework spring, resulting in a significant reduction in construction cost and ease of assembly. The practical value of improving this is great. It can provide an optimal restoring mechanism that can be incorporated into a smaller space.

With the above configuration, the collet support 17
The collet 15 attached to the tip of the slit 20
When the cassette 2 is not inserted, the cassette 2 is lifted above the upper surface of the cassette storage body 3, and when the cassette 2 is installed, the cassette storage body 3 falls, so that the hub 4 is pressed by the plate spring 16. Therefore, the cassette storage body 3
Since the height dimension of the cassette storage body 3 only needs to be thick enough to insert the cassette 2 inside, the thickness direction dimension of the cassette storage body 3 can be reduced, and the entire device including the control board 56 disposed on the top thereof can be reduced. The height can be reduced, and the size can be reduced.

Since the above-mentioned operation is reliable, the collet 15 enters the inside of the cassette storage body 3, and the cassette 2 is inserted.
Since there is no contact during ejection, extremely stable operation can be obtained.

Furthermore, the load acting on the collet 15 of the leaf spring 16 is
Since the plate near the collet 15 acts on the spring hook portion 18, the spring constant of the plate spring 16 can be reduced, so that the pressing force applied to the collet 15 can be made constant.

[Effects of the Invention] As described above, according to the present invention, with a simple configuration,
It is possible to provide a magnetic tray drive device that is designed to be miniaturized, and it can be said that the invention has excellent practical effects.

[Brief explanation of the drawing]

1 and 2 are sectional views showing a conventional example when a cassette is not inserted and when it is inserted, and FIG. 3 is a sectional view showing a magnetic disk drive device according to an embodiment of the present invention when a cassette is not inserted. FIG. 4 is a cross-sectional view showing the insertion and attachment,
FIG. 5 is a top plan view of the same, FIG. 6 is an exploded perspective view of the front panel, and FIG. 7 is a detailed explanatory diagram of the return spring.
FIG. 8 is an exploded perspective view of the main part. ■...Magnetic disk, 2...Cassette 3...Cassette storage body, 4...Knob, 7...Knob holder, 1
0... Drive device, 15... Collet, 16... Leaf spring, 17... Collet support, 21... Front panel,
23... Support part, 34... Lower magnetic head, 35...
...Top magnetic head. Agent: Patent attorney Kosaku Fukuda (and one other person) Kuni 1 and 2 wards

Claims (1)

[Claims] 1. A magnetic disk drive device that is provided with a drive device that rotationally drives a magnetic disk, a magnetic head that writes to and reads from the magnetic guide, and is equipped with a hub holder at the tip of the drive device to mount a cassette. A collet support, whose front end can be brought into contact with the protrusion on the back side of the front panel and a collet is attached to the other end, is fixed to the upper part of the cassette storage body through an IC plate spring, Using the collet support and the retaining part provided on the cassette storage body as a fulcrum, the collet is arranged so that it can be moved up and down when the cassette is inserted and when it is not inserted.
f: Featured magnetic disk drive device.