JPH08263913A - Magnetic disk driving device - Google Patents

Abstract

PURPOSE: To always stably set a cassette by providing an ejecting plate with an inclined groove into which a sliding projected part of a cassette housing body is freely slidably inserted and extending this inclined groove toward the forward side. CONSTITUTION: When the cassette 2 is inserted into the cassette housing body 3, a lock mechanism 53 of the ejecting plate 24 is released from its lock, and the cassette housing body 3 is dropped underneath. Then, the moment a hub of a magnetic disk is mounted on a hub receiver, the front end of a collet supporter is separated from a supporting part of a front panel. Consequently, a collet lifting a slit to a fulcrum is pressed against the hub side by a leaf spring, so as to press the hub of the magnetic disk to the hub receiver.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk drive device, and more particularly to a stabilizer for a cassette containing a magnetic disk and a magnetic disk drive device for fixing and seating.

[0002]

2. Description of the Related Art Generally, a magnetic disk drive is provided with a magnetic head at the tip of a carriage, the carriage and a stepping motor are connected by means such as a steel belt, and the carriage moves in parallel along the surface of the magnetic disk. The structure in which the magnetic head is positioned on a specified track on the magnetic disk is disclosed in, for example, Japanese Patent Publication No. 53-1239.
It is well known from the publication No. 11.

However, there have been various problems in the conventional construction of the hard case of the cassette, such as 3 inches and 3.5 inches.

The problem will be described with reference to FIG. 9 which is a schematic diagram of the essential part of the conventional example.

In FIG. 9, 2 is a cassette containing a magnetic disk, 3 is a cassette housing, 8 is a chassis, and 24 is a chassis.
Is mounted on the chassis 8 and ejects the cassette 2 from the cassette insertion opening (not shown) to the outside, 30 is a chassis side plate, 51 is a locking projection of the eject plate 24, and 53 is mounted on the chassis 8. A lock mechanism that engages and disengages with the lock projection of the eject plate 24, 5
4 is a pin provided on the side surface of the cassette housing 3, 57 is a horizontal portion of the side plate 30, and 58 is a side plate 3 continuous with the horizontal portion 57.
L-shaped guide groove of 0, 59 is cassette housing 3 and side plate 30
It is a tension spring that connects the two.

That is, in the above-mentioned conventional structure, as shown in FIG. 9, when the cassette 2 is inserted into the cassette housing 3 and pushed in the chassis 8, the pin 54 provided on the side surface of the cassette housing 3 is released. The horizontal portion 57 of the side plate 30 is slid horizontally while resisting the tension spring 59, and then the side plate 30 is moved.
Attempt to fall along the L-shaped guide groove 58 of.

At this time, the component force Q of the pulling spring 59 is applied to the L-shaped guide groove 58, and the pin 54 starts to drop vertically and the tension of the pulling spring is high, but it is just before the cassette 2 is seated at a predetermined position. When the tension of the pulling spring becomes smaller, the pin 54 cannot be completely dropped due to the influence of the component force in the Q direction, and the pin 54 may be caught in the middle of the lower portion of the L-shaped guide groove 5. In particular, when the device is installed vertically, there is a drawback in that this value is markedly inconvenient.

Further, in the conventional example shown in FIG. 9, if disturbance vibration is applied in the loaded state of the cassette housing body 3, the cassette 2 floats from the seating surface, and stable seating cannot be guaranteed. It was

Further, in the conventional example shown in FIG. 9, during the period from the unloading state to the loading state of the cassette housing body 3, the cassette housing body 3 behaves with time as shown in FIG. 1 (in FIG. 11, reference numeral 2 is a cassette, 3 is a cassette housing, and 54 is a pin provided on the side surface of the cassette housing 3).
As shown in FIG. 1 (a), the cassette 2 is loaded into the cassette housing 3
When the cassette housing 3 is inserted into the chassis and pushed in the chassis, the cassette housing 3 moves laterally for a certain distance. Therefore, a space that does not hinder the movement of the cassette housing 3 must be secured in the chassis. The chassis becomes larger by that amount.

By the way, the technique relating to the insertion / ejection of the cassette of the magnetic disk drive device is disclosed in, for example, Japanese Utility Model Laid-Open No. 58-26771.
The eject plate shown in the same publication also has a pair of parallel portions extending in parallel at positions of different heights and an inclination connecting the parallel portions to each other. And a pin for the cassette storage body is inserted and arranged in the guide hole. According to this eject plate, after the cassette is loaded, the pin is located at a lower horizontal position following the inclined part. Even if the cassette is pressed up and down and the cassette is shaken up and down, the chucking failure can be prevented.

According to the technique disclosed in Japanese Utility Model Laid-Open No. 58-26771, the disc cassette 4 is loaded before it reaches a predetermined position by cassette loading.
The engaging protrusions of the leaf spring member are elastically pressed and engaged with the four corners from above.

However, this requires a leaf spring member and its mounting member, which not only increases the number of parts but also requires a lot of labor and time for mounting each member.

On the other hand, as described above, a guide hole is formed by a pair of parallel portions extending parallel to each other at different heights and an inclined portion connecting these parallel portions to each other. There is also proposed an eject plate having a structure in which a pin on the cassette housing side is inserted and arranged and which is not particularly provided with a leaf spring member as shown in Japanese Utility Model Application Laid-Open No. 58-26771. If
After loading the cassette, the pins should be
Similar to the publication No. 1, it is pressed by the lower horizontal part following the inclined part to prevent chucking failure. In that case, if there is a gap between the horizontal part and the pin below the inclined part. The upper surface of the horizontal part does not press the upper surface of the pin, which causes the position of the cassette to be unstable. The unstable position of the cassette adversely affects the built-in magnetic disk and ensures reliable recording and reproduction. Cannot be carried out.

For this reason, conventionally, in order to reduce the cumulative dimensional error of each component in product assembly as much as possible, each component has been incorporated with strict dimensional control allowed.
Incorporating each component with such strict dimensional control is a different meaning from the technique disclosed in Japanese Utility Model Publication No. 58-26771 and requires a lot of labor and time to manufacture the product. And

[0015]

DISCLOSURE OF THE INVENTION The present invention eliminates the above-mentioned drawbacks of the prior art, not to mention the miniaturization of the apparatus, and also the cumulative dimensional error of each part without adopting a complicated structure. Absorbing, saving the labor required for product manufacturing, contributing to shortening the manufacturing time as a result, and even if there is an error in the dimension of each part, the cause of cassette seating instability is surely removed. SUMMARY OF THE INVENTION It is an object of the present invention to provide an improved magnetic disk drive device that can always achieve stable cassette seating at the same time.

[0016]

According to the present invention, a chassis having a bottom portion and both side wall portions provided on both sides of the bottom portion and extending in the front-rear direction, and a flat-plate-shaped cassette containing a magnetic disk can be freely inserted and removed. And a cassette housing which is inserted into the chassis and is movable toward and away from the chassis so as to move toward and away from the bottom of the chassis, and the cassette housing approaches the bottom of the chassis. The seating portion provided on the bottom of the chassis so that the cassette inserted into the cassette housing can be seated when moved like this, and the seating portion is orthogonal to the moving direction of the cassette housing, and along the side wall portion. An eject plate provided on the chassis so as to move forward and backward so as to move forward and backward, and a front side of the eject plate provided on the eject plate From the front side to the rear side of the eject plate, the inclined groove is formed so as to be inclined so as to approach the bottom portion of the chassis as it goes toward the rear side. A front edge inclined surface and a rear edge inclined surface serving as a rear edge, and a sliding convex portion provided on the cassette storage body and slidably guided so as to move back and forth from the front side to the front side of the inclined groove, By the pushing of the traveling movement, the pushed eject plate is held in the pushed state, and the cassette is inserted into the cassette storage body, and the holding mechanism is released, and the lock mechanism is released to push the eject plate. A push-back urging unit that pushes back the eject plate that was in a state so as to move backward, and the eject plate is moved backward by the push-back urging unit to move the eject plate backward. When the cassette is seated on the seating portion of the chassis, the position of the inclined groove with respect to the sliding convex portion moves from the front side to the front side while pressing the sliding convex portion on the rear edge inclined surface of the inclined groove, On the contrary, when the eject plate is moved forward to separate the cassette from the seating portion of the chassis, the position of the inclined groove with respect to the sliding convex portion moves from the front side to the front side, and the inclination of the inclined groove increases. In the case of pressing the sliding convex portion with a surface, the eject plate is provided with a substrate portion and both side plate portions extending in the front-back direction in which both ends of the substrate portion are bent at right angles, and both side plate portions of the eject plate are the chassis. The eject plates are arranged on the chassis so that the board parts of the eject plates face the bottom part of the chassis along the inner sides of both side wall parts of the eject plate, and two inclined grooves are provided on each of the both plate parts of the eject plate. form And the inclined grooves of each side plate are arranged side by side at a predetermined interval in the front-rear direction, and two sliding protrusions of the cassette storage body are formed on both sides of the cassette storage body, respectively. Direction, the slide protrusions of the cassette container are placed in the inclined groove under the seated state in which the cassette is seated on the seating part of the chassis. It is characterized in that the inclined groove is extended from the front position toward the front side while being inclined.

By inserting the cassette into the cassette housing, the lock mechanism is released, and with the release of the lock mechanism, the eject plate is pushed by the push-back urging means to move backward. When the eject plate is moved backward, the sliding protrusion is pushed by the trailing edge slant surface of the slant groove, so that the cassette housing moves toward the bottom of the chassis and the cassette is seated on the seat of the chassis. Further, since the slidable convex portion of the cassette storage body extends with the slant groove inclined toward the front side from the foremost position placed in the slant groove, the cassette is sufficiently pressed against the seating portion.

On the contrary, the ejecting plate is pushed back and moved forward against the biasing means to push the sliding convex portion on the inclined surface of the front edge of the inclined groove, so that the cassette storage body moves away from the bottom portion of the chassis. Then, the cassette comes off from the seating portion of the chassis. Then, the eject plate is held in the pushed-in state by the lock mechanism.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a magnetic disk drive device according to the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of a magnetic disk drive according to an embodiment of the present invention when a cassette is not inserted, FIG. 2 is a sectional view when the cassette is inserted and mounted, FIG. 3 is a plan view, and FIG. FIG. 5 is an enlarged detailed view of a main part, FIG. 6 is a perspective view of the front panel and its vicinity, FIG. 7 is a detailed explanatory view of the return spring, FIG. 8 is an exploded perspective view of the vicinity of the cassette housing, and FIG. It is a figure showing the behavior of the cassette container in the device of the present invention as change over time.

In the figure, 1 is a magnetic disk, 2 is a flat cassette containing a magnetic disk, 3 is a cassette housing, and 4 is a hub having a guide groove 5 for guiding a guide plate 6 of a hub receiver 7.

Reference numeral 8 denotes a chassis, to which each component of the apparatus is attached, and 9 is a boss integrally formed with the chassis 8. On the inner diameter side of the boss 9, the magnetic field contained in the cassette 2 is provided. Drive device 10 for rotating the disk 1
A housing 11 for supporting the is attached.

The shaft 12 directly connected to the drive unit 10 is provided with a hub receiver 7 for mounting the hub 4 provided at the center of the magnetic disk 1. The magnetic disk 1 is fixed to the hub 4 and is configured to be mounted on the tip of the shaft 12 and to be centered.

A cassette housing 3 into which the cassette 2 is inserted
Is shown in FIG.
As shown in FIG. 5, the guide hole 1 provided on the side surface of the chassis 8
3 (FIG. 1) is configured to be able to move up and down a guide portion (hereinafter, referred to as a guide hole).
A bent spring 14 is formed at the front center of the upper surface of the magnetic disk 1. A leaf spring 16 for applying an appropriate load to the center hub 4 of the magnetic disk 1 via a collet 15 guides the bent protrusion 14. It is fixed to the cassette housing 3 by caulking or welding.

Further, as will be described in detail with reference to FIG. 8, a collet support 17 is provided on the upper portion of the leaf spring 16, and a collet 15 is attached to one end of the collet support 17 and, at the same time, in the vicinity thereof. A slit 20 provided at a position corresponding to the bending protrusion 14 of the cassette housing body 3 by hooking the end portion 19 of the leaf spring 16 of the provided leaf spring hooking portion 18
Is inserted into the bent protrusion 14.

Therefore, since the load acting on the collet 15 of the leaf spring 16 acts on the leaf spring hooking portion 18 in the vicinity of the collet 15, the spring constant of the leaf spring 16 can be reduced and the pressing force applied to the collet 15 can be kept constant. Can be converted.

The other end of the collet support 17 has a cassette insertion opening 22 on the back side of the front panel 21 attached to the front surface of the apparatus.
The support portion 23 is provided below the support portion 23 and is supported by the support portion 23 and the slit 20 inserted into the bent projection 14.

Further, in such a structure, when the cassette 2 shown in FIG. 1 is not inserted, the cassette housing 3 is lifted by the eject plate 24 as shown in FIG. One end of 17 abuts on the support portion 23 of the front panel 21, and the collet 15 attached to the other end of the collet support 17 resists the spring force of the leaf spring 16 attached to the cassette housing 3 with the slit 20 as a fulcrum. Can be lifted.

The lower surface of the collet 15 is set so as to be lifted above the upper surface of the cassette housing 3 when it is lifted.

Therefore, even if the size of the cassette housing 3 in the height direction is set to be approximately the same as the thickness of the cassette 2 inside, the collet 15 does not come into contact with the cassette 2 when the cassette 2 is inserted.

Next, when the cassette 2 is inserted into the cassette housing 3 as shown in FIG. 2, as shown in FIG.
The lock of the eject plate 24 by the lock mechanism 53 (the details of the lock mechanism 53 will be described later) is released, and the cassette housing body 3 falls downward as described below, so that the hub 4 of the magnetic disk 1 is removed. At the same time when the collet support 17 is mounted on the hub receiver 7, the front end of the collet support 17 separates from the support portion 23 of the front panel 21, so that the collet 15 lifted with the slit 20 as a fulcrum is moved to the hub 4 by the leaf spring 16.
Is pressed to the side and the hub 4 of the magnetic disk 1 is received by the hub receiver 7
Press on.

The operation of FIGS. 4 and 5 will be described later in detail.

Further, as shown in detail in FIG. 6, the front panel 2
A mounting hole 26 for mounting a door 25 for closing the cassette insertion port 22 when the apparatus is not used is provided on both side surfaces of the door spring 1, and a door spring 2 for giving elasticity to the door 25.
7 with respect to the insertion shaft 28 formed integrally with the door 25,
The door 25 is rotatably supported in the mounting hole 26 while elastically deforming in the longitudinal direction.

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

Further, a notch portion 31 of both side wall portions 30 formed integrally with the chassis 8 (in FIGS. 4 and 5,
The holding portion 32 for holding the front panel 21 by hooking on the notch 31 is omitted.
1 is integrally formed on both side surfaces.

According to such a front panel structure, the door 2
5 and the door spring 27 are simply provided, and the number of components is smaller than that of the conventional door structure, so that an inexpensive configuration can be achieved. Further, since the cassette insertion port 22 is closed by the single door 25, the design is simple.

On the other hand, in FIGS. 1 to 3, reference numeral 33 denotes a carriage, and a lower magnetic head 34 for writing and reading data on the lower surface of the magnetic disk 1 is provided at the tip of the carriage 33.

An upper magnetic head 35 for writing and reading data on the upper surface of the magnetic disk 1 is provided on the top of the head arm 36 at the tip thereof.

Normally, the centers of the read and write cores of the lower magnetic head 34 and the upper magnetic head 35 are displaced by 8 tracks in the case of 100 TPi (track density per 100 inches).

Reference numeral 37 is a head arm spring for applying an appropriate load when the upper magnetic head 35 is in close contact with the magnetic disk 1.

The carriage 33 and the head arm 36 thus configured move along the concentric circular recording band formed on the magnetic disk 1 via the steel belt 40 attached to the pulley 39 of the stepping motor 38. To do.

Reference numeral 41 denotes a screw for mounting the steel belt 40 to the pulley 39, and the tip of the mounting screw 41 is located at the outermost track and the innermost track recorded on the magnetic disk 1 from the carriage. The stopper 42 is adapted to hit so that 33 does not shift more than two tracks.

This is detected by the outermost track detecting sensor 43 during normal use. However, when the track is moved further from the outermost track by two tracks or more in the outer peripheral direction during transportation or the like, due to the characteristics of the stepping motor 38, the outermost track is detected. This is because there is a risk that it will not be possible to move to the truck.
It is also for preventing the steel belt 40 from being cut off when the stepping motor 38 runs out of control for some reason.

Reference numeral 41 is a locking projection formed integrally with the chassis 8 and penetrating the eject plate 24.

The eject plate 24 is provided with a bent portion 46 on the flow side of the locking projection 44 for locking a push-back urging means (hereinafter referred to as a return spring) composed of a return spring 45. There is.

As shown in detail in FIG. 7, the return spring 45 is provided.
Is bent to a curvature substantially corresponding to the diameter of the locking projection 44, and an arbitrary curvature 47 is provided on both sides thereof.
The central curvature portions 48 are smoothly connected. Furthermore, the curvature 47
An arm 49 of a suitable length is extended outward.

The return spring 45 having such a shape is made of an elastic wire or the like, and the return spring 45 elastically attaches (or locks) the central curvature portion 48 to the locking projection 44. is there. Further, the upper portion thereof is restrained by a retaining portion 50 formed integrally with the chassis 8. Then arm 49
Is locked to the bent portion 46 provided on the eject plate 24, and the eject plate 24 is locked in this locked state.
Will be urged to push back to the front panel 21 side.

As shown in FIGS. 3 and 6, the eject plate 24 has a lock projection 51, a horizontal portion 24a, and an inclined groove 5.
When the cassette 2 is not inserted or is being inserted, the lock projection 51 is locked by the lock mechanism 53 as shown in FIG.
The pin 54, which is a sliding protrusion provided on the cassette housing 3, is lifted by the horizontal portion 24a. As will be described later in detail, the inclined groove 52 includes the front edge inclined surface 52c and the rear edge inclined surface 5
2a.

Here, the structure of the lock mechanism 53, the cassette housing 3, the eject plate 24, and the return spring 45.
12 to 16, the lock mechanism 53 has an inverted L shape.

Then, the straight line portion 5 on one side of this inverted L-shape
3d is mounted on the surface of the chassis 8 with a stepped screw 53h via a lock spring 53i.

The stepped screw 53h has a large diameter portion, a medium diameter portion and a small diameter portion, and the lock spring 53i has a stepped screw 53h.
It is guided by the medium diameter part and is compressed and held between the lower surface of the large diameter part of the stepped screw 53h and the upper surface of the locking mechanism straight part 53d.

The small diameter portion of the stepped screw 53h is a screw and is screwed into the chassis 8.

The screws are stopped by bringing the lower surface of the middle diameter portion into contact with the upper surface of the chassis 8.

A hole larger than the middle diameter portion of the stepped screw 53h is provided in the straight portion 53d of the lock mechanism 53, and the middle diameter portion penetrates the hole.

At the tip of the lock mechanism linear portion 53d, the step portion 5 is provided.
3e is formed, and the height of the step 53e is larger than the thickness of the eject plate 24.

A diameter portion 53f extends from the step portion 53e, and a cut-and-raised portion 53g is provided at the tip thereof.

The lower end of the cut and raised portion 53g is attached to the chassis 8
The contact pressure is determined by the extension force of the lock spring 53i.

The other side of the lock mechanism 53 formed in an inverted L shape is composed of a straight portion 53c, an inclined portion 53b, and a cassette contact portion 53a.

The state before the cassette 2 is inserted into the cassette housing 3 is shown in FIGS. FIG. 4 shows the state of the entire apparatus at that time.

At this time, since the lock projection 51 provided on the eject plate 24 is locked to the cut-and-raised portion 53g of the lock mechanism 53, the eject plate 24
Is biased toward the front panel 21 by the restoring force of the return spring 45, but cannot move in the biasing direction.

Insert the cassette 2 into the cassette housing 3,
The leading end of the cassette 2 is the cassette contact portion 5 of the lock mechanism 53.
When 3a is pushed, the lock mechanism 53 is locked.
The contact portion between the straight line portion 53d and the straight line portion 53c rotates clockwise as a fulcrum. As described above, the rotation is smoothly performed by providing a hole sufficiently larger than the middle diameter portion of the stepped screw 53h in the linear portion 53d of the lock mechanism 53. However, since this rotation is performed against the extension force of the lock spring 53i, when the cassette 2 is inserted, the reaction force is felt.

When the cassette 2 is continuously inserted and the clockwise rotation further proceeds, the lower surface of the lock mechanism cut-and-raised portion 53g rises above the upper surface of the lock projection 51 provided on the eject plate 24, and Since the lock projection 51 and the cut-and-raised portion 53g are disengaged, the eject plate 24 moves toward the front panel 21 side by the restoring force of the return spring 45. This state is shown in FIG.

By the movement of the eject plate 24, the pin 54 on the side surface of the cassette housing 3 is disengaged from the horizontal portion 24a on the side surface of the eject plate 24 and provided on the side surface of the chassis 8 along the rear edge inclined surface 52a of the inclined groove 52. The guide hole 13 drops vertically, and as a result, the positioning hole 2a of the cassette 2 is smoothly inserted into the cassette positioning guide pin 55 provided on the chassis 8.

A guide pin 55 for cassette positioning is inserted into the positioning 2a of the cassette 2 so that the cassette 2
And the lower surface of the cassette 2 is received by the step portion 55a formed at the base of the guide pin 55. Since the cassette 2 is received by the step 55a and the cassette 2 comes to be seated on the chassis 8,
The step portion 55a serves as a seat portion on which the cassette 2 is seated.

The tip end of the cassette 2 that has been dropped does not come into contact with the lock mechanism linear portion 53c because the lock mechanism 53 is provided with the inclined portion 53b.

That is, the cassette 2 is
Immediately after that, since it is not affected by the extension force of the lock spring 53i, it can be dropped more vertically, and stable positioning can be realized. This state is shown in FIGS. The state of the entire apparatus at that time is shown in FIG.

Next, when ejecting the cassette 2, when the eject plate 24 is pushed against the restoring force of the return spring 45, the pin 54 on the side surface of the cassette housing 3 is pushed in the opposite direction. Also, guided by the guide hole 13 provided on the side surface of the chassis 8, the cassette storage body 3 is vertically moved in the direction away from the surface of the chassis 8.

At this time, the lock projection 51 provided on the eject plate 24 abuts against the inclined surface portion of the lock mechanism cut-and-raised portion 53g to press it. Therefore, in the lock mechanism 53, the intersection of the straight portion 53d and the straight portion 53c of the lock mechanism 53 serves as a fulcrum, and the lock spring 53
Rotate clockwise against the extension force of i.

When the eject plate 24 is pushed further, the pin 54 on the side surface of the cassette housing 3 reaches the horizontal portion 24a on the side surface of the eject plate 24. The state of the lock mechanism 53 at this time is the same as that in the case of FIG.

Immediately after this, the lock projection 51 provided on the eject plate 24 is provided with the cut-and-raised portion 53 of the lock mechanism 53.
g, and at the same time, the lock mechanism 53 locks the lock spring 53
It rotates counterclockwise by the extension force of i, the lock projection 51 and the cut and raised portion 53g are engaged again, and the eject plate 2
Lock 4 so that it does not move in the biasing direction. The state of the lock mechanism 53 at this time is as shown in FIGS. 12 and 13, and the state of the entire apparatus is as shown in FIG.

After that, even when the operator finishes the operation of pushing the eject plate 24, the pin 54 on the side surface of the cassette housing 3 is
Will be held on the horizontal portion 24a of the extended surface of the eject plate 24.

The extension force of the lock spring 53i is
Since the front end of the cassette 2 is pushed through the cassette contact portion 53a, the smooth discharge of the cassette 2 is assisted.

When the cassette 2 is not inserted into the magnetic disk drive having such a structure, the state shown in FIG. 1 is obtained as described above.

The state of the return spring 45 at this time is in a state of C which is given the maximum deflection from the unloaded state A shown in FIG. The lock protrusion 51 is locked by the lock mechanism 53, and the horizontal portion 24 a of the eject plate 24 is fixed to the pin 5
Pushing up 4.

Next, when the cassette 2 is inserted into the cassette housing 3, the lock mechanism 53 is unlocked by the cassette 2, so that the eject plate 24 slides toward the front panel 21 side by the restoring force of the return spring 45. . At the same time, the inclined groove 52 of the eject plate 24 also moves in the direction of the arrow P in FIG. 1, so that the pin 54 is connected to the eject plate 2 as shown in FIG.
4 fall out of the horizontal portion 24a, and the eject plate 24
The trailing edge inclined surface 52a of the inclined groove 52 provided on the upper side is pressed downward.

Further, the operation shown in FIGS. 4 and 5 will be described in detail below.

As described above, the pin 54 provided on the side surface of the cassette housing 3 is initially supported on the horizontal portion 24a of the eject plate 24.

When the lock mechanism 53 is released by inserting the cassette 2 into the cassette housing 3, the eject plate 24 slides toward the front panel 21 side by the restoring force of the return spring 45.

As a result, the pin 54 on the side surface of the cassette housing 3 is disengaged from the horizontal portion 24a on the side surface of the eject plate 24, and along the trailing edge inclined surface 52a of the inclined groove 52, the guide hole 13 provided on the side surface of the chassis 8. Is dropped in the vertical direction, and as a result, the cassette 2 is smoothly inserted into the cassette positioning guide pin 55 provided on the chassis 8.

Even when the cassette 2 is completely seated on the chassis 8, the eject plate 24 tries to move to the front panel 21 side by the restoring force of the return spring 45, so that the inclined groove 5
2 the trailing edge inclined surface 52a abuts the pin 54, and the pin 5
Since a component force in the vertical R direction shown in the drawing is given to the cassette 4, the cassette 2 can be seated on the chassis 8 via the cassette housing 3 as a stabilizer.

Of the series of operations described above, the magnetic disk 1 is pressed by the hub receiver 7.

The state in which the magnetic disk 1 is pressed by the hub receiver 7 is as shown in FIG. 2, and the return spring 45 is in the state of B in FIG. 7 and is slightly deflected as compared to when it is not deflected. Is in a state.

Conventionally, two tension springs were used to slide the eject plate 24 described above, but with the configuration of the present embodiment described above, it is possible to use only one wire-working spring. The material cost can be reduced and the assemblability can be improved.

The collet 15 attached to the tip of the collet support 17 uses the slit 20 as a fulcrum.
When the cassette 2 is not inserted, it is lifted above the upper surface of the cassette housing 3, and when the cassette 2 is mounted, the cassette housing 3 drops, so the leaf spring 16 presses the hub 4. Therefore, the size in the height direction of the cassette storage body 3 is only required to be the thickness that allows the cassette 2 to be inserted inside, so that the size in the thickness direction of the cassette storage body 3 can be reduced, and the control board 56 arranged above the cassette storage body 3. The height of the entire device including the above can be reduced, and the size can be reduced.

Further, the above-mentioned operation is sure, and the collet 15 enters the inside of the cassette housing body 3 and the cassette 2
A very stable operation can be obtained without contact when inserting or ejecting.

Further, the load acting on the collet 15 of the leaf spring 16 is such that the leaf spring hooking portion 1 near the collet 15 is applied.
8 and the spring constant of the leaf spring 16 can be reduced, so that the pressing force applied to the collet 15 can be made constant.

As shown in the illustrated embodiment, the trailing edge inclined surface 52a of the inclined groove 52 provided on the side surface of the eject plate 24 is formed.
In addition, if a tongue piece 52b for preventing pin withdrawal, which is provided on the side surface of the cassette housing body 3 and is provided to face the horizontal portion 24a, on the side surface of the eject plate 24 to prevent the pin 54 from coming out, is connected in series, Even if the operator turns the chassis 8 over, the cassette storage body 3 does not come out of the eject plate 24 and fall and be damaged.
It is not necessary to prepare a specially separated part and to assemble it in order to prevent pulling out, thereby shortening the assembling work time and improving the material yield.

The illustrated embodiment is as described above, and the cassette housing 3 is provided with the pin 54 provided on the side surface thereof,
Since it is a system that vertically drops along the guide hole 13 on the side surface of the chassis 8, the cassette 2 is smoothly inserted when positioning the cassette positioning guide pin 55 provided on the chassis 8 and the cassette 2. Furthermore, the return spring 4
5 attempts to move the eject plate 24 in the direction of the front panel 21, and applies a component force in the vertical R direction to the pin 54 on the side surface of the cassette housing 3 by the inclined groove 52 of the eject plate 24. The magnetic disk 1 can be mounted and the contact state between the magnetic disk 1 and the upper and lower magnetic heads 34 and 35 can be improved, and the reliability can be improved. When the apparatus is installed not only horizontally but also vertically Also, it can be stably mounted.

Even if disturbance vibration is applied to the cassette housing 3 in the loaded state, the horizontal component force of the return spring 45 causes the trailing edge inclined surface 52a of the inclined groove 52 provided in the eject plate 24 to move into the cassette housing. Since it acts so as to press the pin 54 on the side surface of the body 3, it is possible to obtain an excellent seating property against disturbance vibration.

That is, unlike the prior art described in the section of the prior art, the cumulative dimensional error of each part is absorbed without further increasing the number of parts, and the labor required for manufacturing the product is saved. As a result, it contributes to shortening the manufacturing time, and even when errors occur in the dimensions of each part,
It is possible to surely remove the cause of unstable seating of the cassette.

Further, during the period from the unloading state to the loading state of the cassette housing body 3, the cassette housing body 3 exhibits the behavior over time as shown in FIG. 10 (note that in FIG. 10). , Reference numeral 2 is a cassette, 3 is a cassette housing, 54 is a pin provided on a side surface of the cassette housing 3), and the cassette 2 is inserted into the cassette housing 3 as shown in FIG. However, even when pushing the inside of the chassis, the cassette housing 3 does not move laterally for a certain distance as in the conventional example shown in FIGS. 9 and 11, and therefore, the cassette housing 3 does not move. It is not necessary to secure a space in the chassis that does not hinder the movement of the cassette, not only can the chassis be made smaller by that much, but the cassette storage body 3 need not be moved laterally. Is correspondingly, it means that attained the simplification of the mechanism, which contributes to miniaturization of even devices in this respect.

The cassette 2 which can be attached and detached in this manner can be stably seated on the seating portion of the chassis 8. The present invention will be described by further organizing the above-mentioned embodiments.

That is, the cassette housing 3 is the cassette 2
Is inserted and removed, and the cassette 2 is seated on the seating portion provided on the bottom side of the chassis 8 by inserting the cassette 2. The cassette is so arranged that the moving direction of the cassette housing 3 that moves the cassette 2 toward and away from the seating portion of the chassis 8 (the direction of movement toward and away from the bottom of the chassis) is perpendicular to the inserting / removing direction of the cassette 2. The storage body 3 is provided in the chassis 8. The operation of moving the cassette housing 3 toward and away from the cassette housing 3 is such that a pin 54 serving as a sliding protrusion provided at a side end of the cassette housing 3 slides on the guide portion of the guide hole 13 provided in the chassis 8. It is done in.

The eject plate 24 provided on the chassis 8 performs the contact movement operation of the cassette housing 3 so that the cassette 2 can be moved forward and backward along the inserting and removing direction.

The forward / backward movement operation of the eject plate 24 is the reverse operation of the insertion / removal operation of the cassette 2. When the cassette 2 is inserted and seated on the seat, the eject plate 24 moves backward. When the ejecting plate 24 is moved forward so as to be pushed in, the cassette 2 is separated from the seating portion and returned to be pulled out.

This is mainly performed by the inclined groove 52 of the eject plate 24 and the return spring 45 of the push-back urging means. The inclined groove 52 extends so as to approach the bottom of the chassis 8 as it goes from the front side to the rear side of the eject plate 24. Moreover, this inclined groove 52
Is an inclined groove 52 from the front side to the rear side of the eject plate 24.
Has a front edge inclined surface 52c which becomes the front edge and a rear edge inclined surface 52a which becomes the rear edge. The trailing edge inclined surface 5 which is the inclined surface of the trailing edge
A pin 54 as a sliding convex portion of the cassette housing 3 is slidably supported between 2a and a front edge inclined surface which is a front edge inclined surface.

First, the cassette 2 is inserted into the cassette housing 3 where the cassette 2 is not inserted. When the cassette housing 3 is inserted all the way in, the lock of the lock mechanism 53 that holds the eject plate 24 in the pushed state is released by the cassette 2, and the eject plate 24 is pushed back by the return spring 45 of the push-back biasing means. Move backward to. By the backward movement of the eject plate 24, the pin 54 as the sliding convex portion of the cassette housing 3 receives the downward pressing force at the rear edge inclined surface 52a of the eject plate 24. In this way, the pin 54 as the sliding convex portion
Is guided by the guide portion of the guide hole 13 provided in the chassis 8 and moves downward, so that the cassette 2 is seated on the seat portion. On the contrary, in order to remove the cassette 2, the eject plate 24 is pushed in. The eject plate 24 is moved to the back and pushed in against the return spring 45 of the push-back urging means.
Is held by the lock mechanism 53 in a locked and pushed state. Due to the progressive movement of the pushing, the pin 54 as the sliding convex portion of the cassette housing body 3 receives the pushing-back force pushed back upward by the front edge inclined surface 52c of the eject plate 24. In this way, the pin 54 as the sliding convex portion is guided by the guide hole 13 provided in the chassis 8 to move upward, and the cassette 2 is moved so as to be separated from the seat portion.

The cassette 2 is seated on the seating portion of the chassis 8 and is detached from the seating portion by the forward / backward movement of the eject plate 24 as described above, but the seating on the seating portion is stable. It is designed to be carried out.

That is, under the final seated condition in which the eject plate 24 moves backward and the cassette 2 is pressed against the seated portion of the chassis 8, the pin 54 as the sliding convex portion of the cassette housing body 3 is inclined. The configuration is such that the inclined groove 52 extends with the front side facing forward rather than the earliest position in which the inclined groove 52 is placed. That is, in the final seated state, the trailing edge slant surface 52a of the slant groove 52 that applies a downward pressing component force to the pin 54 is
4 has a structure in which it further extends while being inclined relative to the position of the frontmost position where 4 abuts, so that even if there are dimensional errors in the various parts that make up this device, the rear edge inclined surface 52a of the inclined groove 52 A pressing force for pressing the pin 54 of the sliding convex portion is obtained, and the stable seated state of the cassette 2 is maintained.

The eject plate 24 has a base plate and both side plates extending in the front-rear direction by bending both ends of the base plate at right angles. Inclined grooves 52 are provided on both side plate portions. Two inclined grooves 52 are formed in each side plate portion, and each inclined groove 52 is arranged so as to be lined up with a predetermined interval in the front-rear direction.

The eject plate 24 having such a shape is such that both side plate portions of the eject plate are along the insides of the both side wall portions 30 of the chassis 8 and the board portion of the eject plate 24 faces the bottom portion of the chassis 8. And is placed in the chassis 8.

On the other hand, two pins 54 provided on both sides of the cassette housing 3 are also formed and are arranged side by side at a predetermined interval in the front-rear direction. Then, the pin 54 is inserted into the inclined groove 52 and is connected to the eject plate 24 so that the cassette housing 3 is supported at four places.

As described above, since the cassette housing 3 is supported at four points, the cassette housing 3 is moved toward and away from the eject plate 24 so that it can move back and forth while keeping the parallel state toward the chassis. . Therefore, the operation of seating or detaching the cassette 2 on or from the seating portion of the chassis 8 can be performed stably while maintaining the parallel state without tilting.

When the cassette 2 is seated on the chassis 8, the cassette housing 3 supported from four points receives a pressing force that is not offset, so that a stable seated state is maintained.

The slidable convex portion of the cassette housing body 3 is the inclined groove 52.
Four slanted grooves 52 that extend with the slanted groove 52 inclined in the forward direction from the innermost position.
Since each of the cassettes has a sufficient length, even if the dimensions of the eject plate 24 are warped or bent or the dimensions of each component are slightly poor, the cassette 2
Can be sufficiently seated on the seating portion of the chassis 8.

This is because each of the four slanting grooves 52 has a sufficient length, and therefore, before the cassette 2 is seated on the seating portion of the chassis 8, one of the sliding protrusions 52 is slanted.
This is because the sliding protrusion does not reach the end on the far side of the above and becomes a dead end.

The present invention is not limited to the illustrated embodiments, and it goes without saying that appropriate design changes can be made without departing from the spirit of the present invention.

[0108]

As described above, according to the present invention, a chassis having a bottom portion and both side wall portions provided on both sides of the bottom portion and extending in the front-rear direction, and a flat-plate-shaped cassette containing a magnetic disk are provided. Is inserted into and removed from the chassis, and the cassette housing is provided so as to move toward and away from the chassis so as to move toward and away from the bottom of the chassis. A seating portion provided on the bottom portion of the chassis so that the cassette inserted in the cassette storage body can be seated when the cassette storage body moves toward the bottom portion, and the side wall portion is orthogonal to the contact / separation moving direction of the cassette storage body. Move forward and backward along
An eject plate provided on the chassis so as to move back and forth so as to move backward, and provided on the eject plate,
And an inclined groove that extends so as to approach the bottom of the chassis as it advances from the front side to the rear side of the eject plate, and this inclined groove is formed, and the inclined groove extends from the front side to the rear side of the eject plate. And a trailing edge slanting surface which is a leading edge and a trailing edge slanting surface which is provided in the cassette housing and is slidably guided so as to move back and forth from the front side to the front side of the slant groove. A moving convex portion and a lock mechanism that holds the eject plate that has been pushed in by the pushing of the moving movement and is held in the pushed state and that the holding is released by inserting the cassette into the cassette storage body, and the lock mechanism. And a push-back urging unit that pushes back the eject plate that has been pushed in so as to move backward when released. When the cassette is seated on the seating portion of the chassis by moving backward, the position of the inclined groove with respect to the sliding convex portion slides on the trailing edge inclined surface of the inclined groove while moving from the front side to the front side. When the convex portion is pressed and the eject plate is moved in the opposite direction to remove the cassette from the seating portion of the chassis, the position of the inclined groove with respect to the sliding convex portion moves from the front side to the front side. Meanwhile, in the one in which the sliding convex portion is pressed by the front edge inclined surface of the inclined groove, the eject plate is provided with a substrate portion and both side plate portions extending in the front-rear direction in which both ends of the substrate portion are bent at right angles, and the eject plate is provided. The eject plates are arranged on the chassis so that both side plate parts of the eject plate are along the inner sides of the both side wall parts of the chassis, and the base plate part of the eject plate faces the bottom part of the chassis. Inclination Two grooves are formed, and the inclined grooves of each side plate are arranged side by side at a predetermined interval in the front-rear direction, and the sliding protrusions of the cassette container are arranged on both sides of the cassette container. They are formed one by one and are arranged side by side with a predetermined interval in the front-rear direction, and when the cassette is seated in the seating part of the chassis, the sliding convex part of the cassette storage body is inclined. A magnetic disk drive device is characterized in that an inclined groove is extended toward the front side while being inclined with respect to the frontmost position placed in the groove.

According to this structure, there are the following advantages.

(1) In addition to downsizing the device, the cumulative dimensional error of each part is absorbed without using a complicated structure, and the time required for manufacturing the product is saved, resulting in the manufacturing time. The improvement that contributes to the shortening of the product, and can reliably eliminate the factors that cause cassette instability even when the dimensions of each component have errors, and can always achieve stable cassette seating at the same time. It is possible to obtain the magnetic disk drive device.

(2) Two inclined grooves are arranged on each of both side plate portions of the eject plate so as to be lined up at a predetermined interval in the front-rear direction. The cassette storage body is supported from four locations by four sliding projections, two on each side of the slide projections, which are arranged side by side at a predetermined interval in the front-rear direction. For this reason, since the cassette housing is moved toward and away from the cassette plate while the eject plate is moved back and forth, the cassette seating and uncoupling operations on the chassis seating portion are in parallel without tilting. It is performed stably while being maintained.

(3) The cassette containing the magnetic disk that is seated so as to be pressed against the seating portion of the chassis is a cassette storage body supported from four places, and since it receives a pressing force with no overall deviation, Sits comfortably on the seating part of the chassis and maintains a stable seated state.

(4) The four slanting grooves formed by extending the slanting groove of the cassette container toward the front side of the slanting groove from the foremost position where the sliding convex portion is placed in the slanting groove are: Since the lengths are large enough, the cassette can be fully seated in the chassis seating area, even if the ejector board part is warped or bent, or the dimensions of each part are slightly inaccurate. Can be made.

This is because each of the four slanted grooves has a sufficient length, and therefore, before any one of the sliding projections is seated on the seating portion of the chassis, one of the sliding protrusions is located on the tip side of the slanting groove. Since the sliding convex portion does not become a dead end, the cassette cannot be seated sufficiently, and seating failure does not occur.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a magnetic disk device according to an embodiment of the present invention when a cassette is not inserted.

FIG. 2 is a vertical cross-sectional view of a magnetic disk device in which a cassette is inserted according to an embodiment of the present invention.

FIG. 3 is a plan view of a magnetic disk device according to an embodiment of the present invention when a cassette is not inserted.

FIG. 4 is a side view mainly showing the cassette housing body and the eject plate immediately before the cassette is seated, according to the embodiment of the present invention.

FIG. 5 is a side view mainly showing the cassette housing body and the eject plate after the cassette is seated, according to the embodiment of the present invention.

FIG. 6 is an exploded view according to an embodiment of the present invention, showing a front panel,
The eject plate and chassis are mainly shown.

FIG. 7 is an operation explanatory view of the return spring according to the embodiment of the present invention.

FIG. 8 is an exploded view of an embodiment of the present invention, mainly showing the cassette housing and the collet.

FIG. 9 is a partial enlarged view showing a related configuration of a cassette storage body and an eject plate according to a conventional example.

FIG. 10 is an operation explanatory view of the cassette housing according to the embodiment of the present invention.

11 is an operation explanatory view of the cassette storage body in the conventional example of FIG.

FIG. 12 is an enlarged plan view showing a lock mechanism and an eject plate locked by the lock mechanism according to the embodiment of the present invention.

FIG. 13 is an enlarged vertical sectional view showing a lock mechanism and an eject plate locked by the lock mechanism according to the embodiment of the present invention.

FIG. 14 is an enlarged vertical sectional view according to the embodiment of the present invention, showing that the eject plate is disengaged from the lock mechanism in the cassette to be inserted.

FIG. 15 is an enlarged plan view showing a state after the eject plate is disengaged from the lock mechanism according to the embodiment of the present invention.

FIG. 16 is an enlarged vertical sectional view according to the embodiment of the present invention, showing a state after the eject plate is disengaged from the lock mechanism.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Magnetic disk, 2 ... Cassette, 3 ... Cassette storage body, 8 ... Chassis, 24 ... Eject plate, 45 ... Return spring (push-back biasing means), 52 ... Inclined groove, 52a ... Upper inclined part, 53 ... Lock mechanism , 54 ... Pins (sliding protrusions), 5
5a ... Step (seat).

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] April 23, 1996

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction content]

[0001]

The present invention relates to relates to a magnetic disk drive, particularly stable instrumentation attachment of the cassette with a built-in magnetic disk, and a magnetic disk drive apparatus that achieve fixing seat.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

At this time, the component force Q of the pulling spring 59 is applied to the L-shaped guide groove 58, and the pin 54 starts to drop vertically and the tension of the pulling spring is high, but it is just before the cassette 2 is seated at a predetermined position. When the tension of the pulling spring becomes smaller, the pin 54 cannot be completely dropped due to the influence of the component force in the Q direction, and the pin 54 may be caught in the middle of the lower portion of the L-shaped guide groove 5. In particular, when the device is installed vertically, there is a drawback in that this kind of problem is prominent.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

Further, in the conventional example shown in FIG. 9, during the period from the unloading state to the loading state of the cassette housing body 3, the cassette housing body 3 behaves with time as shown in FIG. 1 (in FIG. 11, reference numeral 2 is a cassette, 3 is a cassette housing, and 54 is a pin provided on the side surface of the cassette housing 3).
As shown in FIG. 1 (a), the cassette 2 is loaded into the cassette housing 3
Inserted into, when is pushed inside the chassis, because the cassette housing body 3 to move a certain distance laterally, the space does not interfere with the movement of the cassette housing body 3 must be secured in the chassis, The chassis becomes larger by that amount.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

According to the technique disclosed in Japanese Utility Model Laid-Open No. 58-26771, the disc cassette 4 is loaded before it reaches a predetermined position by cassette loading.
One of the relative corner, and the projection for engagement of the leaf spring member from above to resiliently crimping engagement.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Name of item to be corrected] 0015

[Correction method] Change

[Correction content]

[0015]

[0008] The present invention eliminates the disadvantages of the above prior art, miniaturization of the apparatus, of course, the accumulated dimensional error of components without employing a complicated structure in conjunction with this absorbed, contributes to shortening of the result, the production time by eliminating the labor required for product manufacture, even yet case any errors in the dimensions of the parts, to ensure removal factors cassette seated instability SUMMARY OF THE INVENTION It is an object of the present invention to provide an improved magnetic disk drive device that can always achieve stable cassette seating at the same time.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction content]

By inserting the cassette into the cassette housing, the lock mechanism is released, and with the release of the lock mechanism, the eject plate is pushed by the push-back urging means to move backward. The backward movement of the eject plate, since pressing the sliding protrusions in edge inclined plane of the inclined groove, the cassette container is moved so as to approach the bottom of the chassis, the cassette is seated on the seat portion of the chassis. Further, since the slidable convex portion of the cassette storage body extends with the slant groove inclined toward the front side from the foremost position placed in the slant groove, the cassette is sufficiently pressed against the seating portion.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Name of item to be corrected] 0045

[Correction method] Change

[Correction content]

[0045] Then, the eject plate 24, on both sides of the locking projection 44, biasing means pushing back made of return spring 45 (hereinafter, referred to as a return spring) bent portion 46 for locking is provided a There is.

[Procedure Amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0067

[Correction method] Change

[Correction content]

Next, when ejecting the cassette 2, when the eject plate 24 is pushed against the restoring force of the return spring 45, the pin 54 on the side surface of the cassette housing 3 is pushed in the opposite direction. and the guide hole 1 provided on the side surface of the chassis 8
3, the cassette housing 3 is vertically moved away from the surface of the chassis 8.

[Procedure Amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0068

[Correction method] Change

[Correction content]

At this time, the lock projection 51 provided on the eject plate 24 abuts against the inclined surface portion of the lock mechanism cut-and-raised portion 53g to press it. Thus, the locking mechanism 53, copulation portion of the straight portion 53d and the straight line portion 53c of the locking mechanism 53 becomes a fulcrum, and the locking spring 53
Rotate clockwise against the extension force of i.

[Procedure Amendment 10]

[Document name to be amended] Statement

[Correction target item name] 0071

[Correction method] Change

[Correction content]

After that, even when the operator finishes the operation of pushing the eject plate 24, the pin 54 on the side surface of the cassette housing 3 is
It will be held in the eject plate 24 side surface of the horizontal portion 24a.

[Procedure Amendment 11]

[Document name to be amended] Statement

[Correction target item name] 0080

[Correction method] Change

[Correction content]

Even when the cassette 2 is completely seated on the chassis 8, the eject plate 24 tries to move to the front panel 21 side by the restoring force of the return spring 45, so that the inclined groove 5
2 the trailing edge inclined surface 52a abuts the pin 54, and the pin 5
4, because it gives a vertical R component force in the direction shown, through the cassette housing body 3, the cassette 2 is stable <br/> instrumentation attachment on the chassis 8 can be seated.

[Procedure Amendment 12]

[Document name to be amended] Statement

[Correction target item name] 0081

[Correction method] Change

[Correction content]

[0081] Chi's of such a series of operations, the magnetic disk 1 will be pressed into the hub receiving 7.

[Procedure Amendment 13]

[Document name to be amended] Statement

[Correction target item name] 0087

[Correction method] Change

[Correction content]

As shown in the illustrated embodiment, the trailing edge inclined surface 52a of the inclined groove 52 provided on the side surface of the eject plate 24 is formed.
If a pin removal preventing tongue piece 52b for preventing a pin 54 provided on the side surface of the cassette housing 3 from coming off is provided in series with the horizontal portion 24a on the side surface of the eject plate 24, Even if the operator turns the chassis 8 over, the cassette housing 3 does not fall out of the eject plate 24 and is not damaged by dropping.
It is not necessary to prepare a specially separated part and to assemble it in order to prevent pulling out, thereby shortening the assembling work time and improving the material yield.

[Procedure Amendment 14]

[Document name to be amended] Statement

[Correction target item name] 0090

[Correction method] Change

[Correction content]

[0090] That is, as in the prior art mentioned in the description of prior art above, without increasing the number of parts, deliberately moreover absorb a cumulative dimensional error of the parts, saving the labor required for product manufacture there contributes to shortening of the results in production time and even if the resulting errors in the dimensions of the parts,
It is possible to surely remove the cause of unstable seating of the cassette.

[Procedure Amendment 15]

[Document name to be amended] Statement

[Correction target item name] 0096

[Correction method] Change

[Correction content]

This is mainly performed by the inclined groove 52 of the eject plate 24 and the return spring 45 of the push-back urging means. The inclined groove 52 extends so as to approach the bottom of the chassis 8 as it goes from the front side to the rear side of the eject plate 24. Moreover, this inclined groove 52
Is an inclined groove 52 from the front side to the rear side of the eject plate 24.
Has a front edge inclined surface 52c which becomes the front edge and a rear edge inclined surface 52a which becomes the rear edge. The trailing edge inclined surface 5 which is the inclined surface of the trailing edge
A pin 54 as a sliding convex portion of the cassette housing 3 is slidably supported between 2a and a front edge inclined surface 52c which is an inclined surface of the front edge.

[Procedure Amendment 16]

[Document name to be amended] Statement

[Correction target item name] 0097

[Correction method] Change

[Correction content]

First, the cassette 2 is inserted into the cassette housing 3 where the cassette 2 is not inserted. Inserting all the way into the cassette housing body 3, so that the locking of the locking mechanism 53 holds the eject plate 24 in a press-down state is released by the cassette 2, the eject plate 24 is returned pushed by the return spring 45 of the push-back biasing means Move backward to. This eject plate 24 moves backward,
The pin 54 as the sliding convex portion of the cassette housing 3 receives a downward pressing force at the trailing edge inclined surface 52a of the eject plate 24. In this way, the pin 54 as the sliding convex portion is guided by the guide portion of the guide hole 13 provided in the chassis 8 and moves downward, so that the cassette 2 is seated on the seat portion. On the contrary, in order to remove the cassette 2, the eject plate 24 is pushed in. The eject plate 24 is moved to the back and pushed in against the return spring 45 of the push-back urging means.
The lock mechanism 53 is locked and held in the pushed state. Due to the progressive movement of the pushing, the pin 54 as the sliding convex portion of the cassette housing body 3 receives the pushing-back force pushed back upward by the front edge inclined surface 52c of the eject plate 24. In this way, the pin 54 as the sliding convex portion is guided by the guide hole 13 provided in the chassis 8 to move upward, and the cassette 2 is moved so as to be separated from the seat portion.

[Procedure Amendment 17]

[Document name to be amended] Statement

[Correction target item name] 0106

[Correction method] Change

[Correction content]

This is because each of the four slanting grooves 52 has a sufficient length, and therefore, before the cassette 2 is seated on the seating portion of the chassis 8, one of the sliding protrusions 52 is slanted.
It arrived-out earlier in the line of other party side, because it is no longer becomes a dead end of the sliding protrusion.

[Procedure 18]

[Document name to be amended] Statement

[Correction target item name] 0114

[Correction method] Change

[Correction content]

This is because each of the four slanted grooves has a sufficient length, and therefore, before any one of the sliding projections is seated on the seating portion of the chassis, one of the sliding protrusions is located on the tip side of the slanting groove. to end up, its becoming a dead end of the sliding protrusion Ri Ah because there is no seating the cassette is not seated failure occurs can not be sufficiently.

Claims (1)

[Claims] 1. A chassis having a bottom portion and both side wall portions provided on both sides of the bottom portion and extending in the front-rear direction, and a flat-plate-shaped cassette containing a magnetic disk inserted therein in a removable manner, and the chassis. A cassette storage body that is movable toward and away from the chassis so as to move toward and away from the bottom of the chassis, and a cassette when the cassette storage body moves toward the bottom of the chassis. A seating portion provided on the bottom of the chassis so that the cassette inserted in the storage body can be seated, and a forward / backward movement in the front-back direction that is orthogonal to the contact / separation movement direction of the cassette storage body and along the side wall portion. The eject plate provided on the chassis so as to move forward and backward, and the eject plate provided on the eject plate and moving from the front side to the rear side of the eject plate. A sloped groove extending so as to approach the bottom of the chassis, and a front edge sloped surface and a rear edge that form the sloped groove and become the front edge of the sloped groove from the front side to the rear side of the eject plate. A trailing edge slanted surface, a slidable convex portion provided in the cassette storage body and slidably guided so as to move back and forth from the front side to the front side of the slanted groove, and by pushing in the traveling movement, By holding the pushed eject plate in the pushed state and inserting the cassette into the cassette housing, the lock mechanism is released, and by releasing the lock mechanism, the eject plate in the pushed state is released. And a push-back urging means for pushing back so as to move the retreat. The push-back urging means moves the eject plate backward to move the ejecting plate to the seating portion of the chassis. When seating the set,
While the position of the inclined groove with respect to the sliding convex portion moves from the front side to the front side, the sliding convex portion is pressed by the trailing edge inclined surface of the inclined groove, and conversely the advancing plate is moved to move the chassis. When the cassette is detached from the seating portion, the position of the inclined groove with respect to the sliding convex portion moves from the front side to the front side and presses the sliding convex portion on the front edge inclined surface of the inclined groove, The eject plate is provided with a substrate portion and both side plate portions extending in the front-rear direction by bending both ends of the substrate portion at right angles, so that both side plate portions of the eject plate are along inner sides of both side wall portions of the chassis, and The eject plate is arranged on the chassis so that the board part of the eject plate faces the bottom part of the chassis, and two inclined grooves are formed on both side plate parts of the eject plate and the inclined grooves of each side plate part are arranged in the front-rear direction. To Arranged side by side at a predetermined interval, forming two sliding protrusions of the cassette storage body on each side of the cassette storage body and arranging them at a predetermined spacing in the front-rear direction. Under the seated state in which the cassette is seated on the seating part of the chassis, the slanted groove of the cassette housing is inclined toward the forward side from the foremost position in which the slidable convex part is placed in the slanted groove. A magnetic disk drive device characterized by being extended as it is.