JPH0863918A - Magnetic disk driving device - Google Patents

Abstract

PURPOSE: To prevent damages to the magnetic recording part of a magnetic disk by providing a rotary type oil dumper in an eject plate for braking the sliding movement of the eject plate. CONSTITUTION: An eject button is provided in front center of an eject plate 2. A rotary type oil dumper 11 is provided on a chassis 1 in the vicinity of this eject button. When a cassette 4 is pushed in the rear part direction of the chassis 1 and engagement between the projecting part 10 of the eject plate 2 and the pawl 7 of a releasing plate 5 is released in order to realize a head loading state, the eject plate 2 is moved in the front direction of the chassis 1 by means of a spring force applied by a returning spring. Since the pin 12 of the oil dumper 11 is fitted into an engaging hole provided in the projecting part of the eject plate 2, a brake is directly put on the movement of the eject plate 2 and the movement of the eject plate 2 to the front part is made slow. Thus, the upper part magnetic head 9 of an upper side head arm 8 is softly landed on the magnetic disk.

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, and more particularly to a magnetic disk drive having a mechanism for softly landing an upper magnetic head.

[0002]

2. Description of the Related Art In a conventional magnetic disk drive, as shown in JP-A-54-121712 and JP-A-58-91562, an upper magnetic head provided on a head arm is abruptly moved. It is provided with a structure for preventing the upper and lower magnetic heads from being damaged by falling onto the lower magnetic head provided on the carriage.

The one disclosed in Japanese Patent Laid-Open No. 54-121712 is provided with an appropriate oil damper between a head arm for raising and lowering a magnetic head and a carriage for mounting the head arm. The damper directly applies a braking force proportional to the descending speed of the head arm to the head arm to softly land the magnetic head provided on the head arm on the magnetic disk.

Japanese Patent Application Laid-Open No. 58-91562 discloses that a magnetic disk is mounted on a head arm that moves up and down by opening and closing a door provided in a magnetic disk insertion opening of a magnetic disk drive. The eject plate is provided with a stopper for restricting the upper magnetic head provided on the head arm from coming into contact with the lower magnetic head provided on the carriage when it is not mounted in the driving device. And the stopper locks the head arm and lifts the head arm unless the magnetic disk is mounted in the magnetic disk drive.
In addition, when the magnetic disk is mounted on the magnetic disk drive, it is detached from the head arm and the head arm is lowered.

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the structure shown in Japanese Patent Laid-Open Publication No. JP-A-2003-242, the braking arm of the oil damper is directly locked to the head arm having the upper magnetic head and requiring high-precision operation so as to reduce the descending speed of the head arm. ing. Therefore, there is a drawback in that the oil damper must be highly accurate. Moreover, the above-mentioned JP-A-54-
In the configuration of Japanese Patent Application Laid-Open No. 121712, a complicated mechanism including a soft arm, a bail, an electromagnet, and the like is required to rotate the head arm. There is a disadvantage that there is.

In the structure disclosed in Japanese Patent Application Laid-Open No. 58-91562, the head arm is moved up and down in conjunction with the rotation of the door. When the door is forcibly opened and closed while locked to the arm, excessive force is applied to the stopper and the head arm, and both of them are deformed and there is a high risk of malfunction, and the two are the stopper and the head arm. When the lock is released, the head arm descends suddenly and the upper magnetic head collides strongly with the magnetic disk, so that there is a high risk of damaging both the upper magnetic head and the magnetic disk.
One is the clamp arm that works with the opening and closing of the door.
Since the head arm and the center cone for holding the magnetic disk on the spindle are moved up and down, it is necessary to make the dimensions related to the door, the clamp arm, the head arm and the center cone highly accurate. And has the disadvantage of low productivity.

In view of the above drawbacks, the object of the present invention is to
A magnetic disk with a simple and highly productive structure that can prevent damage to the upper magnetic head and the magnetic disk by softly landing the upper magnetic head on the magnetic disk using a highly accurate rotary oil damper. In providing a drive device.

[0008]

SUMMARY OF THE INVENTION The present invention comprises a chassis,
An eject plate mounted on the chassis and slidably provided so as to move back and forth along the surface of the chassis, and in a direction orthogonal to the sliding direction of the eject plate mounted on the chassis. A cassette storage body that is provided so as to slide toward and away from the surface of the chassis, and a magnetic disk that is inserted into and removed from the cassette storage body along the sliding direction of the eject plate. A flat plate-shaped cassette that is built in, guide members provided on both sides of the cassette storage body, and guide members provided on both sides of the eject plate so as to move and guide the guide member, and the inner side of the eject plate. The slides that move back and forth allow the cassette housing to move toward and away from the chassis surface. An inclined groove which imparts to the set container,
The eject plate pushed into the back side is held in the pushed state, and the lock mechanism that releases the held state of the pushed state in the cassette that is inserted into the cassette storage body and the lock mechanism is pushed in by the release of the lock mechanism. A push-back urging means that pushes back the eject plate that was in the state so as to move backward toward the front side, and a magnetic head that is provided at a rear side position of the chassis that passes through the center of the chassis and that includes an upper head member and a lower head member. A device and an upper magnetic head provided on the tip side of the upper head arm are rotatably supported by the upper head arm so that one side (upper surface) of the magnetic disk is pressed by a head spring. The upper head member and the other surface of the magnetic disk, which is opposed to the upper magnetic head through the magnetic disk. A lower magnetic head that is in contact with a lower surface of the lower head arm. The lower head member is formed by supporting the lower magnetic head on the tip side of the lower head arm. Side of the magnetic disk is pressed against the lower magnetic head by moving the cassette storage body so as to approach the chassis surface along with the movement. And the upper magnetic head is pressed against the upper surface of the magnetic disk by the head spring so that the upper and lower magnetic heads sandwich the magnetic disk and brake the sliding movement of the eject plate. It is characterized in that a rotary oil damper is provided.

[0009]

First, when the cassette is inserted into the cassette housing and the cassette is pushed, the eject plate is gradually moved by the rotary oil damper toward the front of the chassis. When the eject plate moves, the inclined groove slowly lowers the cassette storage body along the vertical guide hole. When the cassette housing is lowered along the vertical guide groove, the head arm supported by the seat provided in the cassette housing is also slowly lowered, and the upper magnetic head provided in the head arm is soft landed on the magnetic disk. Then, the head is loaded.

Next, when the eject plate is pushed in the rearward direction of the chassis in the head loaded state, the cassette housing is lifted up along the vertical guide groove by the inclined groove.
When the cassette housing is lifted along the vertical guide groove, the head is also lifted by the seat provided in the cassette housing, and the upper magnetic head provided in the head arm is separated from the magnetic disk, that is, the head unload is performed. It becomes a state.

[0011]

An embodiment of the present invention will be described below with reference to the drawings. 1 to 4, 1 is a chassis,
2 is an eject plate, 3 is a cassette housing having side guide rollers, 4 is a cassette containing a magnetic disk, 5 is a release plate, 6 is a contact portion of the release plate 5, and 7 is a release plate 5.
Claws, 8 is an upper head arm provided at the rear of the chassis 1, 9 is an upper magnetic head provided at the lower surface of the upper head arm 8, 10 is a protrusion provided at the rear of the eject plate 2,
Reference numeral 11 is a rotary oil damper, 12 is a pin of the rotary oil damper 11, 13 is an inclined groove provided on a side surface side of the eject plate 2, 14 is a vertical guide groove provided on a side surface side of the chassis 1, and 15 is an eject plate 2 16 provided on the front of the
Is a return spring provided between the chassis 1 and the eject plate 2, and acts so as to push the eject plate 2 toward the front side. 17 is a seat provided at the rear of the cassette housing 3;
Is a rear end portion of the cassette 4, 19 is a square hole provided in the protruding portion 15, and 20 is an eject button provided in the front portion of the eject plate 2. A spring force that constantly pushes the upper head arm 8 acts on the seat 17.

Further, a magnetic head device including the upper magnetic head 9 and the upper head arm 8 will be described. The magnetic head device is provided at a position on the back side of the chassis 1 which passes through the center of the chassis 1. The magnetic head device includes an upper head member having an upper magnetic head 9 at the lower end of the upper head arm 8 and a lower head member having a lower magnetic head 9'at the lower end of the lower head arm 8 '. . The upper head member has a rear end side supported by the chassis 1 so as to rotate in the vertical direction, and has a head spring 8a for pressing the upper magnetic head 9 against the magnetic disk.
The upper magnetic head 9 comes into contact with the upper surface of the magnetic disk so as to be pressed, and the lower magnetic head 9 'comes into contact with the lower surface, which is the surface of the magnetic disk opposite to the upper magnetic head 9, so as to be pressed. The magnetic disk is sandwiched between the upper magnetic head 9 and the lower magnetic head 9'from both upper and lower surfaces. This sandwiched state is
It is formed under the head-loaded condition described later.

A cassette housing 3 containing a cassette 4
Presses the eject button 20 to move the eject plate 2 toward the rear of the chassis 1.
The guide roller provided on the side surface of the cassette housing body 3 by the inclined groove 13 provided on the side surface of the chassis 1 side is provided with the guide roller provided on the side surface of the housing body 3 with the vertical guide groove provided on the side surface side of the chassis 1. As shown in FIG. 1, the cassette 4 is moved upward in 14 and moved in a direction away from the surface of the chassis 1, that is, a head unload state, and the cassette 4 is ejected from the cassette housing 3. This state is held by the projection 10 on the rear portion of the eject plate 2 engaging with the claw 7 of the release plate 5.

When the cassette housing 3 is moved away from the surface of the chassis 1, the upper head arm 8 is rotated upward by the receiving seat 17 provided at the rear portion of the cassette housing 3, as shown in FIG. The upper magnetic head 9 is maintained in a state of being separated from the magnetic disk housed in 4.

The cassette 4 is moved in the rearward direction of the chassis 1 so that the rear end portion 18 of the cassette 4 contacts the contact portion 6 of the release plate 5.
Is pressed and the release plate 5 is rotated, so that the claw 7 and the eject plate 2
Of the eject plate 2 as it is released from the protrusion 10
Is moved toward the front of the chassis 1 by the return spring 16. When the eject plate 2 moves forward of the chassis 1, the guide rollers provided on the side surfaces of the cassette housing 3 are moved downward in the vertical guide grooves 14 by the inclined grooves 13, and as shown in FIG. The cassette housing 3 moves toward the surface, and the upper head arm 8 pivotally moves so that the upper magnetic head 9 contacts the magnetic disk in the cassette 4, that is, the head loading state.

In the head-loaded state, the magnetic disk is sandwiched between the upper magnetic head 9 and the lower magnetic head 9 ', as described above, so that the magnetic disk is clamped from both upper and lower surfaces. The operation status leading to the sandwiched state will be described.

As the eject plate 2 is moved forward of the chassis 1 by the return spring 16, the cassette housing 3 descends toward the chassis 1, so that the magnetic disk inserted into the cassette housing 3 is The lower surface is pressed against the lower magnetic head 9'of the lower head member so as to abut. As the cassette housing 3 descends, the seat 17 of the cassette housing 3 that has held down the downward rotation of the upper head arm 8 against the head spring 8a is lowered. The upper magnetic head 9 is pushed downward by the use spring 8a and lands so as to abut the upper surface of the magnetic disk.

As described above, the magnetic disk is sandwiched by the upper and lower magnetic heads 9 and 9'which are abutted so as to be hit from both upper and lower surfaces. The hard upper and lower magnetic heads 9 and 9 ', which strike against each other from both sides, soften the contact between the upper and lower magnetic heads 9 and 9'when sandwiched so that the recorded information on the magnetic disk is not destroyed. To prevent the recorded information from being damaged.

In a so-called single-sided magnetic head system in which the magnetic head is not used on one side of the magnetic disk, the hard magnetic head is not pinched so as to be struck from both sides, so that the magnetic Damage to the report information does not occur even if the head is not hit. This damage of recorded information has occurred in a so-called double-sided magnetic head system in which a magnetic disk is sandwiched between both magnetic heads, and a measure for preventing magnetic disk recording information from being damaged by a magnetic head is a double-sided magnetic head system. This is a unique issue.

An eject button 20 is provided in the front center of the eject plate 2. As shown in FIGS. 3 and 4, a small rotary oil damper 11 is provided on the chassis 1 near the eject button 20. A projecting portion 15 is integrally provided on the front portion of the eject plate 2. Projection 15
A square hole 19 is provided in this.

As shown in FIGS. 3 and 4, the pin 12 of the rotary oil damper 11 is fixed at a position eccentric from the center of rotation of the rotary oil damper 11, which is formed on the projecting portion 15 of the eject plate 2. It is engaged with a square hole 19 which is an engaging hole.

When the cassette 4 is pushed in the rearward direction of the chassis 1 to disengage the projection 10 of the eject plate 2 and the claw 7 of the release plate 5 in order to bring the head into the loaded state, the eject plate 2 causes the return spring 16 to move. The spring force moves the chassis 1 toward the front. Since the pin 12 of the rotary oil damper 11 is engaged with the engagement hole 19 provided in the projecting portion 15 of the eject plate 2, the rotary oil damper 11 directly brakes the movement of the eject plate 2, The front movement of the eject plate 2 becomes slow.

Therefore, the vertical guide groove 1 is formed by the inclined groove 13.
4, the guide roller gradually descends, and the cassette housing 3
Also, the upper head arm 8 provided with the upper magnetic head 9 is slowly moved toward the surface of the chassis 1 and the head is loaded.

Therefore, the upper magnetic head 9 of the upper head arm 8 can be soft-landed on the magnetic disk by the gentle drop of the cassette housing 3 and the upper head arm 8, and the magnetic recording portion of the magnetic disk can be prevented from being damaged. It is done.

Further, since the pin 12 provided eccentrically from the rotation center of the rotary oil damper 11 is slidably engaged with the engaging hole 19 of the eject plate 2, the eject plate 2 is moved forward. The arm length of the moment with respect to the force acting on the pin 12 from the eject plate 2 formed between the engagement point of the pin 12 and the engagement hole 19 and the rotation center of the rotary oil damper 11 as the pin 12 moves. It will change along with it. This will be explained.

That is, FIG. 3 shows a head unload state, and FIG. 4 shows a head load state.

As is apparent from FIG. 4, the pin 12 in the head unload state (shown by a chain line) moves to the position shown by the solid line in the head load state. As can be seen from the movement direction of the eject plate 2 and the position of the pin 12 indicated by the arrow P, the length of the arm of the moment is short in the head unloaded state and long in the head loaded state.
As described above, since the length of the arm of the moment changes, the movement of the eject plate 2 tends to be heavier in the head unload state and lighter in the head load state.

On the other hand, the force by which the return spring 16 pushes the eject plate 2 in the front direction is large in the head unload state and becomes small toward the head load state. This return spring 16
Since the change in which the pushing force of the eject plate 2 decreases and the change in the arm length of the moment such that the movement of the eject plate 2 is lightened are matched, the moving speed of the eject plate 2 is the same as that of the upper head arm 8. There is little change until the upper magnetic head 9 lands on the magnetic disk.
The stable landing operation of is obtained.

The engaging hole 19 with which the pin 12 is engaged is formed in a square shape. The engaging hole 19 is provided in the original pin 12.
Although it may be a long groove that fits, it is a square groove due to the following circumstances.

The eject plate 2 has a projection 10 for engagement provided on the rear end side for engaging and disengaging with a claw 7 of a release plate 5 rotatably provided on the chassis 1 and at the front end. The side is configured to engage with the pin 12 of the rotary oil damper 11 by engaging with the engaging hole 19. The parts have variations in dimensional accuracy. Due to the accumulation error of this variation, when the eject plate 2 is operated, the protrusion 10
The engagement and disengagement of the claw 7 with the claw 7 is not performed well, and there is a possibility of malfunction.

In order to cope with this malfunction, the engaging hole 19 is made square. That is, by making it rectangular,
The pin 12 can play inside the engagement hole 19. That is, since the eject plate 2 and the rotary oil damper 11 are connected with each other with a play, even if there is a small amount of the above-mentioned accumulation error, the accumulated error is absorbed by the amount of the play and the malfunction does not occur. .

Further, since the rotary oil damper 11 is not engaged with the upper head arm 8 but is engaged with the eject plate 2, the braking accuracy of the oil damper varies, so that the upper head arm 8 is low in accuracy. It does not hinder the operation of.

That is, the upper head arm 8 is provided with a pressing spring for pressing the upper magnetic head 9 against the magnetic disk. On the other hand, the eject plate 2 is also provided with a return spring 16. The return spring 16 of the eject plate 2 has a large spring force, but the pressing spring of the upper head arm 8 has a considerably small spring force.

The oil damper usually has a lot of braking accuracy and a low braking accuracy. This is because the viscosity of oil easily changes with temperature. When the oil damper is engaged with the head arm 8, the variation in braking of the oil damper with respect to the small spring force of the pressing spring has a great effect, and the landing operation of the upper magnetic head 9 on the magnetic disk is too strong or too weak. The landing operation becomes unstable. However, in the case where the rotary oil damper 11 is engaged with the eject plate 2, since the return spring 16 of the eject plate 2 has a large spring force, there is not much influence due to the braking variation of the oil damper,
The eject plate 2 performs a gentle and stable return operation with braking. Therefore, when the rotary oil damper 11 is engaged with the eject plate 2, the landing operation of the upper magnetic head 9 on the magnetic disk is stable even if the oil damper has a low braking accuracy. Become.

In this embodiment, the eject button 20 is provided so as to project from the front of the eject plate 2, so that the rotary oil damper 11 is provided in the zet space beside the eject button 20 as shown in FIGS. 3 and 4. Since the magnetic disk drive device is provided with the rotary oil damper 11, the magnetic disk drive device can be made compact without increasing the external dimensions of the magnetic disk drive device.

[0036]

[Effects of the Invention] A chassis and a chassis mounted on the chassis,
And an eject plate slidably provided so as to move back and forth along the surface of the chassis, and a surface of the chassis which is attached to the chassis and slides in a direction orthogonal to the sliding direction of the eject plate. A cassette storage body that is provided so as to approach or separate from above, and a flat plate shape that is inserted into and removed from the cassette storage body along the sliding direction of the eject plate and that has a built-in magnetic disk. A cassette and guide members provided on both sides of the cassette housing,
Slides that are provided on both sides of the eject plate to guide and guide the guide member and that move back and forth toward the rear side of the eject plate cause the cassette storage body to move toward and away from the surface of the chassis. And a lock mechanism that holds the eject plate pushed inwardly in a pushed state and holds the pushed state in the cassette that is inserted into the cassette storing body. , A push-back urging means for pushing back the eject plate that has been pushed in so as to retreat toward the front side by releasing the lock mechanism, and a rear side position of the chassis that passes through the center of the chassis and is provided on the upper side. A magnetic head device including a head member and a lower head member, and an upper magnetic member provided on the tip side of the upper head arm. The upper head member formed to rotatably support the upper head arm so that the head is pressed by one side (upper surface) of the magnetic disk by a head spring, and the upper portion via the magnetic disk. The other surface (lower surface) of the magnetic disk facing the magnetic head
And a lower head member formed by supporting a lower magnetic head that abuts on the tip side of a lower head arm, and when the lock mechanism is released, the eject plate is moved to the front side by the push-back urging means. By moving the cassette housing so as to move backward so as to approach the chassis surface, the other surface (lower surface) of the magnetic disk is pressed against the lower magnetic head. Rotation in which the upper magnetic head is pressed against the upper surface of the magnetic disk by the head spring and the upper and lower magnetic heads sandwich the magnetic disk, and the sliding movement of the eject plate is braked. It is in a magnetic disk drive device equipped with an oil damper.

According to the present invention, the following advantages can be expected.

(1). Since the moving operation of the eject plate is directly braked by the rotary oil damper, the motion of pushing the eject plate toward the front side by the return spring becomes slow, so that the cassette storage body is closed. Also, the upper head arm falls gently, and the upper magnetic head of the upper head arm is soft-landed on the magnetic disk, so that the magnetic recording portion of the magnetic disk is prevented from being damaged.

[Brief description of drawings]

FIG. 1 is a side view of essential parts in a head unloader state according to an embodiment of the present invention.

FIG. 2 is a side view of a main part in a head-loaded state according to an embodiment of the present invention.

FIG. 3 is a top view according to an embodiment of the present invention when a head is unloaded.

FIG. 4 is a main part top view at the time of head loading according to one embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Chassis, 2 ... Eject board, 3 ... Cassette storage body, 4 ... Cassette, 8 ... Upper head arm, 8 '... Lower head arm, 9 ... Upper magnetic head, 9' ... Lower magnetic head, 11 ... Rotation type Oil damper, 13 ... Inclined groove, 1
4 ... Vertical guide groove, 17 ... Seat.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuro Akasaki 1-1-1, Higashitaga-cho, Hitachi-shi, Ibaraki Hitachi Ltd. Taga factory

Claims (1)

[Claims] 1. A chassis, an eject plate mounted on the chassis and slidably provided so as to move back and forth along a surface of the chassis, and an eject plate mounted on the chassis. Of the cassette storage body that is slid in a direction orthogonal to the sliding direction of the chassis to move closer to or away from the surface of the chassis, and is inserted into and removed from the cassette storage body along the sliding direction of the eject plate. A flat-plate cassette that is freely inserted and has a built-in magnetic disk, guide members provided on both sides of the cassette housing, and guide members provided on both sides of the eject plate so as to move and guide the guide member. And the slide that moves back and forth on the back side of the eject plate moves the cassette housing closer to the chassis surface. The inclined groove that gives the cassette storage body a movement to move in and out, and the eject plate that has been pushed inward are held in the pushed state and the cassette inserted in the cassette storage body holds the pushed state. A lock mechanism that is released, a push-back urging means that pushes back the eject plate that was in the pushed state so as to retreat to the front side when the lock mechanism is released, and a position on the back side of the chassis that passes through the center of the chassis. And a magnetic head device provided on the upper head member and a lower head member, and the magnetic head provided on the tip side of the upper head arm is pressed against one surface (upper surface) of the magnetic disk by a head spring. The upper head member formed to rotatably support the upper head arm, and the magnetic disk A lower magnetic head that is formed by supporting a lower magnetic head that faces the upper magnetic head via the lower magnetic head and is in contact with the other surface (lower surface) of the magnetic disk on the tip side of the lower head arm. By releasing the lock mechanism, the eject plate moves so as to be retracted to the front side by the push-back biasing means, and the cassette storage body moves so as to approach the chassis surface with this movement. The other surface (lower surface) of the magnetic disk is pressed against the lower magnetic head so that the upper magnetic head is pressed against the upper surface of the magnetic disk by the head spring. The magnetic disk is sandwiched between the two, and a rotary oil damper for braking the sliding movement of the eject plate is provided. And a magnetic disk drive device.