JP2514958Y2 - Magnetic disk drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a magnetic disk drive device using a magnetic disk cartridge in which a disk-shaped magnetic recording medium is housed, and more particularly, The present invention relates to a magnetic disk drive device characterized by a shock absorbing device for mitigating a collision of the magnetic head with the magnetic disk when the magnetic head is loaded on the magnetic disk.

[Conventional technology]

There are generally known two types of magnetic disk drive devices, one that uses a magnetic disk housed in a hard cartridge case and the other that uses a magnetic disk housed in a soft case. . Among them, in the case of using the disk cartridge housed in the hard case, the case is rigid, and thus various handling is possible through this case. For this reason, there are a type that enables loading by pushing the disc cartridge into the cartridge insertion port and a type that performs so-called automatic loading in which the disc cartridge is pulled in and loaded on the device side by simply inserting the disc cartridge into the cartridge insertion port.

However, in any case, after the disk cartridge is loaded on the turntable, signal writing / reading cannot be performed unless the magnetic head is brought into contact with the magnetic disk. Therefore, at least at the end of loading,
The magnetic head must be touching the magnetic disk. When the magnetic head is touched, generally, there is a buffer device that directly or indirectly regulates or brakes the operating speed of a supporting member (hereinafter also referred to as a hold case) as a supporting unit that supports the movable magnetic head. used. Examples of the shock absorbing device include a device that uses the viscosity of oil, a device that uses the elasticity of rubber itself by a rubber cylinder and an elasticity of air, a device that uses an elastic body such as a spring, and those and lever members. There are various types such as combinations.

Among these, the ones that use oil, a spring and a rotating member that rotates are relatively often used to directly regulate the operation of the hold case. This example is shown in FIG.

In this conventional example, the rotating member 71 is rotatably supported by a bearing fixed to the chassis 3 side of the magnetic disk drive device 1 via its rotating shaft 71b, and the rotating member 71 is always supported by a load spring. The rotating end 71a is elastically biased toward the chassis 3. The rotating shaft supported by the bearing of the rotating member 71
Silicon oil is filled between the 71b and the bearing to regulate the rotation speed. Further, the rotating end 71a of the rotating member 71 is located on the upper surface of the cartridge holder 7, and the protrusion (hereinafter, referred to as a load arm) 33 of the hold case 15 contacts the opposite side (upper side) of the cartridge holder from the cartridge holder 7. Is intended for.

With such a configuration, during unloading, the hold case 15 is located at a position farthest from the chassis 3 side via the rotating end 71a of the rotating member 71 due to the upward movement of the cartridge holder 7. Then, when the disk cartridge is pushed into the cartridge holder 7 to load the magnetic disk, the cartridge holder 7 is lowered by an elevating mechanism (not shown). Along with this, the rotating end 71a of the rotating member 71 also rotates in the direction of the chassis 3, but the rotation speed is restricted by the viscous resistance of the silicone oil with which the rotating portion is filled, and the cartridge holder 7 is lowered. It rotates at a speed much slower than the speed. Since the rotating end 71a of the hold case 15 is in contact with the chassis 3 side, the hold case 15 descends to the magnetic disk side following the rotation of the rotating end 71a, and eventually the magnetic head 11b moves to the magnetic disk. It will be a soft landing.

Further, in such a magnetic disk drive device 1, when ejecting the disk cartridge, a slide member generally called a slide plate 25 is pushed into the back side of the chassis 3 and slid, and this sliding movement is carried out by the cartridge holder 7. It has been converted into a lifting movement.

[Problems to be solved by the device]

By the way, in the shock absorbing device configured as described above, since the rotating end 71a of the rotating member 71 is brought into contact with the load arm 33, the descending load of the magnetic head 11b is directly received by the shock absorbing device and the torque is high. By the way, I was using it. However, this kind of highly viscous silicone oil is
There is a possibility that the oil characteristics may change and a sufficient viscous resistance may not be obtained, so that the buffer function may not be achieved.

The present invention has been made in view of the above-mentioned problems of the prior art, and has been made to solve the problems.
An object of the present invention is to provide a magnetic disk drive device capable of stably performing soft landing of a magnetic head.

[Means for solving the problem]

In order to achieve the above object, the present invention provides a cartridge holder for holding a disk cartridge containing a disk-shaped magnetic disk, and a lifting operation of the cartridge holder to turn the magnetic disk in the held disk cartridge. A cartridge holder elevating means for loading onto the table and unloading from the turntable; a rotation driving means for rotationally driving the turntable; a magnetic head for writing and / or reading a signal to and from the magnetic disk; A magnetic disk supporting means for supporting the magnetic head and so as to be able to move toward and away from the magnetic disk, a magnetic head transferring means for transferring the magnetic head supporting means in a radial direction of the magnetic disk, and a magnetic head for loading. For magnetic disks There is provided a cushioning means for alleviating the impact at the time of contact and a lever member having a fulcrum arranged near the magnetic head supporting means so as to raise and lower the magnetic head supporting means in conjunction with the raising and lowering of the cartridge by the cartridge holder raising and lowering means. The magnetic head elevating means and the cartridge holder elevating means are provided, and the lever member is raised and locked via the cushioning means in conjunction with the raising operation of the cartridge, and the cushioning means of the cushioning means is interlocked with the lowering of the cartridge. The lock means is provided so as to release the lock so as to alleviate the impact at the time of the loading by the buffer means.

[Action]

By the above means, the descending load of the magnetic head is transmitted to the buffer means via the lever member. Since the fulcrum of the lever member is set to be closer to the magnetic head supporting means from the middle of each contact point with the buffer means at both ends of the lever member and the magnetic head supporting means, the lever member which receives the downward load of the magnetic head. Is transmitted to the buffer means as a force smaller than the falling load. Therefore, the oil of the viscous means having a low viscous resistance can be used, and stable soft landing can be performed without changing the oil characteristics due to the temperature change.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 4 is a plan view of the magnetic disk drive device in an unloaded state. In the figure, a magnetic disk drive 1
Is a chassis 3 made of aluminum alloy, and this chassis 3
The cartridge holder 7 that is supported between the side plates 5a and 5b of the chassis 3 in a vertically movable manner with respect to the main body of the chassis 3 and holds the disc cartridge (not shown) inserted from the cartridge insertion port. A turntable 9 for rotationally driving the magnetic disk housed in the case, a spindle motor as a rotational driving means for the turntable 9 (not shown) disposed on the bottom surface side of the chassis 3 for rotationally driving the turntable 9, and a turn. Magnetic heads 11a and 11b described below for writing and / or reading signals to and from the magnetic disk loaded on the table 9, and a carriage 13 and a hold as magnetic head means for supporting these magnetic heads 11a and 11b, respectively. The case 15 and the carriage 13 that supports the hold case 15 in a swingable manner are attached to the magnetic disk. It is mainly composed of a carriage transport device 19 for containing the stepping motor 17 for transporting the radial direction of the click.

On the inner surfaces of the side plates 5a, 5b of the chassis 3, guides for rolling rollers arranged on the side surfaces of the cartridge holder 7 are formed, and the cartridge holder 7 moves along the guides substantially perpendicularly to the chassis 3 main body. It is possible to load and unload the magnetic disk. This movement is performed by a well-known cam mechanism that vertically moves according to the operation of the slide plate 25 that can move in parallel along the upper surface of the chassis 3 main body. When the eject button 27 that is connected is pushed in the depth direction A of the chassis 3, the cartridge holder 7 is pushed upward with the movement thereof, that is, in the unloading direction.

An opening 29 is formed by cutting out a portion of the cartridge holder 7 that is deeper than the turntable 9 in the chassis 3, and the hold case 15 can be moved forward and backward with respect to the opening 29. The hold case 15 is constantly elastically urged toward the carriage 13 by the load spring 30, and the load arm 33 extending from the hold case 15 is brought into contact with one end of a lever member (described later) that is interlocked with a damper 41 serving as a cushioning means. By doing so, the raising / lowering operation of the cartridge holder 7 of the hold case 15, that is, the opening / closing operation (proximity / separation) according to the operation of the slide plate 25 is performed.

A lock lever 35 is swingably supported by a support shaft 37 in a lower portion of the cartridge holder 7 substantially in the center of the figure while being elastically biased by a lock spring 39 in the eject direction at all times. The slide plate 25 is locked and held at the load position by the lock lever 35.

The damper 41 is filled with silicone oil,
It is attached to a side plate 31a of a mounting plate 31 shown in FIGS. 6 (a) to 6 (c), and this mounting plate 31 is screwed and fixed to the bottom surface of the chassis 3. A rotation lever 42 is fixed to the damper 41 on a rotation shaft protruding in the direction of the side plate 5a.
An engaging pin 43 is projected on the free end side surface of the engaging pin 43.
Are two step portions 26a, 26b formed on the side plate 26 of the slide plate 25.
Is engaged with a cam portion having a. Also, the rotation lever 42
A hemispherical engaging projection 44 is provided at the free end of the engaging projection 44, and the engaging projection 44 is engaged with one end 45a of the damper arm 45. The damper arm 45 is rotatably supported by a support shaft 46 of a side plate 31a of the mounting plate 31 and a side plate 31b of the mounting plate 31, and a second arm 47 is rotatably supported by the support shaft 46. ing. Adjustment screw on this second arm 47
The screw 48 is screwed, and is brought into contact with the upper surface of the other end 45b of the tip damper arm 45 of the adjusting screw 48, and is brought into contact with the inclination angle of the second arm 47, that is, the free end 47a of the second arm 47. The positional relationship with the load arm 33, which is vertically moved, can be adjusted. Reference numeral 49 is a torsion coil spring, which is wound around a support shaft 46 and has one end 49a engaged with the upper surface of the second arm 47 and the other end 49b engaged with the bottom plate portion of the mounting plate 31. The second arm 47
The damper arm 45 is urged in a clockwise direction about the support shaft 46 in FIG. 1 (a).

The support shaft 46 is closer to the load arm 33, that is, the contact point a between the one end 45a of the damper arm 45 and the engaging projection 44 of the rotating lever 42.
The distance l ₁ from ₁ to support shaft 46, the second arm 4 from the support shaft 46
Distance l ₂ between the free end 47a of 7 and the contact point a ₂ of the load arm 33
Yes arranged longer, the descent force F acting at a load W from a ₁ decreases and also the stroke of a ₁ than the stroke of a ₂ of the magnetic head which acts in a ₂ are longer. Therefore, for example, if we set l ₁ / l ₂ = 2, F will be 1/2 of W
Becomes

Next, the loading and unloading operations of the magnetic disk drive device 1 having the above-described structure will be described.

FIG. 1A shows a state in which a magnetic disk is loaded on the turntable 9, and FIG. 1B shows an unloaded state in which the magnetic disk is not loaded. FIG. 2 is an explanatory view seen from the direction of the disc insertion opening, FIG. 2 is an explanatory view seen from the plane side, and FIG. 3 is an operation explanation seen from the side direction of each state corresponding to FIGS. It is a figure.

FIG. 1 (b), FIG. 3 (two-dot chain line portion), and fourth
When the disc cartridge (not shown) is inserted from the unloading state shown in the figure, the rotating end of the eject lever 51 comes into contact with the side surface of the shutter (not shown) at the tip of the disc cartridge. The shutter is released and goes to the back. Then, when the cartridge holder 7 is inserted to the deepest part, the lock lever 35 is rotated with the shutter fully opened, and at the same time, the lock of the slide plate 25 is released, and the slide plate 25 is moved to the first position by the elastic force of the spring (not shown). 4, the cartridge holder 7 moves vertically (downward) to the upper surface side of the chassis 3 by the above-mentioned cam mechanism along with the downward movement (the front direction of the magnetic disk drive device 1). At this time, since the load arm 33 of the hold case 15 is not in contact with the cartridge holder 7, the lowering operation of the hold case 15 is not directly linked to the lowering of the cartridge holder 7.

That is, the lowering operation of the hold case 15 is performed by the movement of the slide plate 25 that lowers the cartridge holder 7. That is, the slide plate 25 is moved from the unloaded state shown in FIG. 1 (b) and FIG. 3 (shown by a chain double-dashed line).
3 moves to the right in FIG. 3, the cartridge holder 7 descends as described above, and the engaging pin 43 and the step portion 2 of the rotary lever 42 engaged with the step portion 26b below the slide plate 25.
Hold case 15 when unloading due to engagement with 6b
Was held at the upper position, but this is released, and the hold case 15 is lowered by the urging force of the load spring spring 30. Here, the engagement protrusion 44 of the load arm 33 of the hold case 15 and the rotation lever 42 is formed by the free end 47 a of the second arm 47 supported by the support shaft 46 and the damper arm 4.
5 is in contact with one end 45a of each, and the hold case 15
And the rotation of the rotation lever 42 are interlocked with each other.
Therefore, the damper arm 45 and the second arm 47 gradually rotate the rotation lever 42 counterclockwise in FIG. 3 against the viscosity of the silicone oil by the elastic force of the load spring 30 and the torsion coil spring 49. The hold case 15 is gradually lowered toward the carriage 13 in accordance with the rotation. In this manner, the magnetic head 11b on the hold case 15 side, that is, the upper magnetic head touches the magnetic disk, and the magnetic disk is sandwiched between the magnetic head 11a on the carriage 13 side, that is, the lower magnetic head, and the magnetic disk shown in FIG. The loading state shown in FIG. In this way, the loading of the magnetic disk is completed. The damper arm 45 and the second
Arm 47 is further rotated in the clockwise direction in FIG. 1A by the torsion coil spring 49 to separate the second arm 47 from the load arm 33, and in this state, the engaging pin 43 of the rotating lever 42. Is engaged with the upper step portion 26a shown by the solid line in FIG. 3 or is in contact with the lower end of the screw 50.

When recording or playback is completed and the disc cartridge is taken out, the eject operation is performed. At this time, when the eject button 27 is pushed into the rear side of the chassis 3, the slide plate 25 is accompanied by this. Similarly, the cartridge holder 7 is moved to the back side, and the cartridge holder 7 is moved upward (a direction away from the chassis 3). This slide plate
By moving to the inner side of 25, that is, to the left in FIG. 3, the engaging pin 43 engaged with the upper step portion 26a is moved and engaged with the lower step portion 26b. As a result, the turning lever 42 turns clockwise in FIG. 3, and the damper arm 45 abutting against the engaging projection 44 is resisted against the torsion coil spring 49, as shown in FIG. While rotating counterclockwise, the second arm 47 is also rotated similarly. Then, the free end 47a of the second arm 47 ascends and comes into contact with the load arm 33, so that the load arm 3
The hold case 15 is raised against the load spring 30 via 3. Then, in the unloading state of FIG. 1B, the lock lever 35 is unlocked by the above-described movement of the slide plate 25 to the left, and the lock lever 35 is unlocked.
The coil spring 39 rotates counterclockwise in FIG. 4, and the rotation of the lock lever 35 locks the slide plate 25. At this time, the movement of the eject pin 52 of the lock lever 35 moves the disc cartridge in the opposite direction A. Then, the shutter opening / closing pin (not shown) at the tip of the eject lever 51 is removed from the recess of the disc cartridge, so that the eject lever 51 is rotated counterclockwise by the coil spring 53, and the shutter of the disc cartridge is closed. The disk cartridge moves downward and is ejected from the cartridge insertion opening of the cartridge holder 7.

As described above, according to the above embodiment, the descending load of the magnetic head is transmitted to the rotation lever 42 of the damper 41 via the damper arm 45 and the second arm 47. Then, the support shaft 46 of the damper arm 45 and the second arm 47 is
Since the load lever 33 is set to be closer to the load arm 33 from the middle of each contact point with the rotation lever 42 and the load arm 33 at both ends of both arms 45 and 47, the load drop by the both arms 45 and 47 subjected to the drop load of the magnetic head. A smaller force is transmitted to the rotation lever 42. Therefore, it is possible to use a damper oil having a low viscous resistance, and stable soft landing can be performed without changing the oil characteristics due to a temperature change.

[Effect of device]

As described above, according to the present invention, the lifting and locking / unlocking of the cushioning means and the magnetic head supporting means are interlocked with the lifting and lowering of the cartridge. Therefore, the number of parts can be reduced, and the soft landing of the magnetic head can be stably performed even if the temperature changes.

[Brief description of drawings]

1 to 7 are for explaining one embodiment of the present invention. FIG. 1 (a) shows a magnetic disk loaded on a turntable 9 and FIG. 1 (b) shows a magnetic disk. FIG. 2 is an explanatory view of the vicinity of the shock absorber of the magnetic disk drive device as viewed from the disk insertion port, showing an unloaded state in which the disk is not loaded, FIG. 1A and 1B are operation explanatory views of the respective states viewed from the side, FIG. 4 is a plan view showing the overall configuration of the magnetic disk drive device, and FIG. 5A and FIG.
(B) is a side view and front view of the damper arm, and FIGS. 6 (a), (b), and (c) are front views, side views, bottom views, and FIGS. 7 (a) and (b) of the mounting plate. , (C) are a plan view, a front view and a side view of the second arm, and FIG. 8 is a front view of essential parts of a magnetic disk drive device according to a conventional example. 1 ... Magnetic disk drive, 3 ... Chassis, 7 ...
Cartridge holder, 9 ... Turntable, 11a, 11b
...... Magnetic head, 13 ...... Carriage, 15 ...... Hold case (movable side magnetic head support member), 17 ...... Stepping motor, 19 ...... Carriage transfer device, 25 ...... Slide plate, 27 ...... Eject button, 29 …… Aperture, 33 …… Road arm, 41 …… Damper, 42 …… Rotating lever, 45…
… Damper arm, 46 …… Spindle, 47 …… Second arm.

Claims (1)

(57) [Scope of utility model registration request] 1. A cartridge holder for holding a disk cartridge accommodating a disk-shaped magnetic disk, and the cartridge holder is moved up and down to load the magnetic disk in the held disk cartridge onto a turntable. Cartridge holder lifting / lowering means for unloading from the turntable, rotation driving means for rotationally driving the turntable, magnetic head for writing / reading signals to / from a magnetic disk, and magnetic support for the magnetic head. Magnetic head support means for supporting the magnetic disk so that it can be moved toward and away from the disk, magnetic head transfer means for transferring the magnetic head support means in the radial direction of the magnetic disk, and impact when the magnetic head comes into contact with the magnetic disk during loading. Alleviate A collision means; and a magnetic head elevating means having a lever member whose fulcrum is arranged near the magnetic head supporting means so as to elevate the magnetic head supporting means in conjunction with the elevation of the cartridge by the cartridge holder elevating means. The lever is provided in the cartridge holder elevating means, and the lever member is raised and locked via the buffering means in conjunction with the raising operation of the cartridge, and the buffering means is unlocked in association with the lowering of the cartridge to perform the buffering. A magnetic disk drive device, comprising: a locking device that enables the device to relieve an impact at the time of loading.