JPH04328371A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To prevent resistant force at the time of raising a magnetic head by making the effect of a damper to limit the lowering time of the magnetic head effectively operate only at the time of lowering the magnetic head. CONSTITUTION:An arm part 50 to be abutted when a damper arm 41 is lowered is provided on a damper cam 49. When a driving body 5 is moved to rear to raise the magnetic head and a cartridge, the arm part 52 to be abutted on a pressing arm 51 prolonged from the bottom plate 6 of the driving body 5 and to operate the damper cam 49 to restore is provided.

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 having a damper for damping the operation of a magnetic head.

0002

[Background Art] In recent years, storage capacity has been increased in magnetic disk drives, and high-density media have been adopted for this purpose.In order to reduce damage to the high-density media, it is necessary to buffer the operation of the magnetic head. Dampers have been used. A conventional magnetic disk device of this type will be described below with reference to the drawings. 4 to 6 show a conventional magnetic disk device, in which FIG. 4 is an exploded perspective view, FIG. 5 is a perspective view of a main part, and FIG. 6 is a side view of a main part. 4 to 6, 1 is a supporting board, 2 is a bottom plate, 3 is a side plate, 4 is a back plate, 5 is a driver, 6 is a bottom plate, 7 is a side plate, 8 is a pin, 9 is a long hole, 10,
11 is a spring hook, 12 is a tension spring, 13 is a trigger lever, 14 is a cylindrical part, 15 is an engagement projection, 16 is a cam part,
17 is a pin, 18 is a spring, 19 is a retaining ring, 20 is a locking groove, 21 is a trigger portion, 22 is a side wall, 23 is a holder, 24
are upper and lower guide pins, 25 are front and rear guide pins, 26 are guide shafts, 27 are spring hooks, 28 are fan-shaped openings, 29 are shutter levers, 30 are shutter pins, 31 are spring hooks,
32 is a spring, 33 is a guide groove, 34 is a groove, 35 is an arm, 36 is a magnetic head, 37 is a support arm, 38 is a damper unit, 39 is a support body, 40 is a pin, 41 is a damper arm, 42 is a rotary damper, 43 is a spring, 44 is an arm receiving portion, 45 is an arm portion, 46 is a damper cam, 47 is a U-shaped groove, and 48 is a cartridge.

As shown in FIG. 4, the support substrate 1 has side plates 3 and a back plate 4 connected to both sides and the rear side of a bottom plate 2, respectively. The drive body 5 has side plates 7 connected to both sides of a bottom plate 6. Pins 8 are provided in the middle of the front side of the bottom plate 2 of the support substrate 1 on the inside of the side plate 3 to protrude in the vertical direction. A hole 9 is engaged so as to be slidable back and forth. A spring hook 10 is provided protruding from the bottom plate 6 of the driver 5. A spring hook 11 is provided in a protruding manner on the bottom plate 2 of the support substrate 1 . Both ends of a tension spring 12 are engaged with both spring hooks 10 and 11, and the elasticity of the tension spring 12 biases the driving body forward. The trigger lever 13 has a cylindrical portion 14 formed at its intermediate portion, an engagement protrusion 15 at its tip, and a fan-shaped cam portion 16 at its front end. A pin 17 is provided protruding from the bottom 2 of the support substrate 1, and the cylindrical portion 1 of the trigger lever 13 is attached to this pin 17.
4 is rotatably fitted, a spring 18 is fitted to the upwardly protruding portion of the pin 17, a retaining ring 19 is engaged from above the spring 18 to the retaining groove 20 of the pin 17, and the trigger lever 13 is engaged with the pin 17. 17, and a spring 18 is attached thereto. A trigger portion 21 is provided at the rear of the bottom plate 6 of the driver 5 to project downward. trigger lever 1
The cam portion 16 of No. 3 is inserted under the bottom portion 6 of the driver 5,
One end of the spring 18 is engaged with the inner surface of the side plate 3 of the support board 1, and the other end of the spring 18 is engaged with the engagement protrusion 1 of the trigger lever 13.
5, and the elasticity of the spring 18 causes the trigger lever 1 to
3 is biased counterclockwise, the side wall 22 of the trigger lever 13 comes into contact with the trigger part 21 of the driver 5, and its rotation is restricted. In this state, the cam part 16 of the trigger lever 13 is pressed against the front end of the trigger part 21. They are engaged, and the forward movement of the driver 5 is restricted. Then, when the trigger lever 13 rotates clockwise against the elasticity of the spring 18 and the cam part 16 separates from the trigger part 21, the driver 5 moves the tension spring 12
It moves forward due to its elasticity. The cartridge holder 23 is formed into a rectangular cylindrical shape, with the center part of the lower plate cut out, and upper and lower guide pins 24 are provided at the front and rear of both sides.
A front and rear guide pin 25 is provided in the center to protrude laterally. The upper surface of the holder 23 includes a guide shaft 26, a spring hook 27,
A fan-shaped opening 28 is provided, and a shutter lever 29 is rotatably fitted to the guide shaft 26. The shutter lever 29 has a shutter pin 3 protruding downward from the rotating tip.
0 is provided in a protruding manner, and a spring hook 31 is provided in a protruding manner on the side surface. The shutter lever 29 is biased counterclockwise by a spring 32 engaged across a spring hook 31 and a spring hook 27 of the holder 23 . Guide grooves 33 are formed at the front and rear of both side plates 7 of the driving body 5, and each guide groove 33 is inclined so as to become gradually lower from the front to the rear. The holder 23 is inserted inside the side plate 7 of the drive body 5, the upper and lower guide pins 24 are slidably engaged with the guide grooves 33, and the front and rear guide pins 25 are formed on the side plates 3 of the support substrate 1 so that the upper side It is engaged in the open groove 34 so as to be able to move up and down. Therefore, as shown in FIG. 6, when the drive body 5 is regulated to the retracted position by the engagement between the cam portion 16 of the trigger lever 13 and the trigger portion 21 of the drive body 5, the guide pin 24 is in the guide groove 33. The cam portion 16 of the trigger lever 13 is held in the upper raised position as described above.
is detached from the trigger part 21, and the driver 5 releases the tension spring 1.
When the guide pin 24 moves forward due to the elasticity of the guide pin 24, the guide pin 24 is positioned below the guide groove 33 and held in the lowered position. The arm 35 has a magnetic head 3
6 is attached, and is in contact with and supported by the upper surface of the holder 23 by support arms 37 protruding left and right.

A damper unit 38 is engaged with the upper surface of the bottom plate 2 of the support substrate 1. The damper unit 38 includes a support plate 39, a pin 40 projecting horizontally from the support plate 39, a damper arm 41 rotatably fitted to the pin 40,
A rotary damper 42 and a spring 43 having viscous resistance that increases in proportion to the rotational speed are provided, and the damper arm 41 is provided with an arm receiving portion 44 and an arm portion 45. The damper arm 41 is attached to the arm receiving portion 44 by the spring 43.
is urged to rotate downward, and the arm portion 45 located on the opposite side of the arm receiving portion 44 is connected to a U-shaped groove 47 of a damper cam 46 integrated with the rotary damper 42.
is fitted. The damper arm 41 rotates while the elastic force of the spring 43 and the viscous resistance force of the rotary damper 42 are balanced, so its rotation does not exceed a certain speed. An arm receiving portion 44 of the damper arm 41 is inserted between the upper surface of the holder 23 and the support arm 37 of the arm 35, and is supported by the holder 23 and also supports the arm 35.

The operation of the above configuration will be explained below. Now, as shown in Figure 5, the damper arm 4
1 is urged by a spring 43 and comes into contact with the upper surface of the holder 23 to restrict its position. In this state, the trigger portion 21 of the driver 5 is engaged with the cam portion 16 of the trigger lever 13, and the driver 5 is restricted to the retracted position against the elasticity of the tension spring 12. Therefore, the upper and lower guide pins 24 of the holder 23 are located above the guide grooves 33 of the driver 5,
The holder 23 is raised. The arm receiving portion 44 in contact with the holder 23 has also risen, and the arm 35 in contact with the arm receiving portion 44 and the magnetic head 36 attached to the arm 35 have also risen. When the cartridge 48 is inserted into the holder 23 from this state, the cartridge 48 comes into contact with the engagement protrusion 15 of the trigger lever 13, and as the cartridge 48 moves forward, the trigger lever 13 is rotated clockwise against the elasticity of the spring 18. let trigger lever 1
3 rotates, the cam portion 16 engages the trigger portion 21 of the driver 5.
The driving body 5 moves forward due to the elasticity of the tension spring 12. As the driving body 5 moves, its guide groove 3
The guide pin 24 of the holder 23 is guided to the lower part of the cartridge 3, and the holder 23 and the cartridge 48 are lowered. Holder 2
3, the damper arm 41 also begins to descend, but
The holder 23 is a driving body 5 that moves due to the elasticity of the spring 12.
In contrast, the lowering operation of the damper arm 41 is lowered by the rotary damper 4.
2, the operation will be completed within a certain period of time. Therefore, the lowering movement of the arm 35 supported by the damper arm 41 also follows the damper arm 41 and is not a sudden movement, and the impact that the magnetic head 36 applies to the medium in the cartridge 48 is small. Conversely, when the driver 5 is pushed backward against the elasticity of the tension spring 12, the upper and lower guide pins 24 of the holder 23 are guided to the upper part of the guide groove 33, and the holder 23, cartridge 48, damper arm 41, and arm 35 rises. Further, as the driver 5 moves backward, the trigger part 21 separates from the tip of the cam part 16 of the trigger lever 13, the trigger lever 13 rotates counterclockwise due to the elasticity of the spring 18, and the cartridge 48 is pushed out accordingly. Since a portion of the cartridge 48 protrudes from the holder 23, the cartridge 48 can be removed from the holder 23.

[0006]

However, in the conventional magnetic disk drive described above, in order to slow down the descending speed of the magnetic head 36, the arm 35 to which the magnetic head 36 is attached is supported by the damper arm 41, and the operation of the damper arm 41 is rotated. It was limited by damper 42. Therefore, even when lifting the holder 23 and the cartridge 48 upward to take out the cartridge 48, the rotary damper 4
The resistance force of 2 is applied to the damper arm 41, holder 23, and driver 5.
Therefore, the resistance of the rotary damper 42 increases in proportion to the operating speed of the driver 5. Therefore, when the driving body 5 is suddenly pressed, it receives a large resistance from the rotary damper 42, and this resistance force causes deformation of the damper arm 41 and the holder 23. Due to this deformation, the position of the arm 35 is lowered, and the trigger lever There was a problem in that the required distance from the cartridge 48 pushed out by the cartridge 13 was not secured. In addition, the force for pressing the driving body 5 becomes large, resulting in a problem of deterioration of the operating feeling. The present invention solves these conventional problems.When a magnetic head with a cartridge inserted therein descends, a damper works to delay the descent time of the magnetic head, and when the cartridge is removed, the damper reduces the resistance of the magnetic head. In addition to preventing it from acting on the head lifting mechanism,
It is an object of the present invention to provide a magnetic disk device in which a return operation of a damper can be performed with a smaller force.

[0007]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a magnetic disk drive including a support substrate, a drive body slidably supported by the support substrate, and a drive body that moves in one direction. a holder that is rotatably supported by the support substrate, is capable of restricting movement of the driver by the biasing means, and is inserted into the holder; a trigger lever that can be rotated by a cartridge to release the restriction on the movement of the drive body; a damper arm that moves up and down as the holder moves up and down; and an arm to which a magnetic head is attached that is supported by the damper arm and moves up and down. and a rotary damper that limits the movement of the damper arm, and the rotary damper has an arm that comes into contact only when the damper arm and the magnetic head move downward, and when the drive body moves in the direction of lifting the holder upward. The rotary damper is provided with another arm that comes into contact with the drive body, rotates by the operation of the drive body, and rotates the rotary damper in a direction that moves the damper arm and the magnetic head upward.

[0008]

[Operation] According to the present invention, the arm portion contacts the damper arm only when the magnetic head moves downward toward the rotary damper, and the arm portion contacts the drive member when the holder is lifted upward and the drive member is pressed in the direction to take out the cartridge. By providing two arms that are in contact with each other and another arm that rotates the rotary damper in the opposite direction when the magnetic head is lowered, only the movement of the magnetic head and damper arm is restricted when the magnetic head is lowered.
When lifting the magnetic head, which is the opposite operation, the resistive force acts only on the driving body, creating a damper effect.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 3 are perspective views of essential parts of a magnetic disk drive according to an embodiment of the present invention. Figures 1 to 3
In the above, the same reference numerals as those in the conventional example are the same as those in the conventional example. 49 is a damper cam, 50 is an arm portion, 51
52 is a pushing arm, and 52 is an arm portion. As shown in FIG. 1, the damper cam 49 of the rotary damper 42 has a damper arm 4.
An arm portion 50 positioned in a direction in which the damper arm 41 comes into contact only when the damper arm 41 rotates in a direction in which the arm receiving portion 44 of the first arm moves downward, and a push arm 51 provided extending from the bottom plate 6 of the driving body 5 are driven. An arm portion 52 is provided in a direction that comes into contact with the body 5 when the body 5 moves rearward. The other configurations are the same as those of the conventional example, so explanations will be omitted.

Regarding the operation of the embodiment with the above configuration, FIGS.
This will be explained with reference to FIG. FIG. 1 shows a state in which the driver 5 is engaged with the trigger lever 13 and is restricted in position backward against the elasticity of the tension spring 12. Therefore, holder 2
The upper and lower guide pins 24 of No. 3 are located above the guide groove 33 of the drive body 5, and the holder 23, the arm receiving portion 44 in contact with the holder 23, and the arm 3 in contact with the arm receiving portion 44.
5 is rising. Further, the arm portion 52 of the damper cam 49 contacts the pushing arm 51 of the driver 5, and fixes the damper cam 49 in the direction in which the arm portion 50 contacts the arm portion 45 of the damper arm. When the cartridge 48 is inserted into the holder 23 from this state, the cartridge 48 comes into contact with the engagement protrusion 15 of the trigger lever 13, and as the cartridge 48 moves forward, the trigger lever 13 is rotated clockwise against the elasticity of the spring 18. let When the trigger lever 13 rotates, the cam portion 16 separates from the trigger portion 21 of the driver 5, and the driver 5 rapidly moves forward due to the elasticity of the tension spring 12. As the driving body 5 moves, the upper and lower guide pins 24 of the holder 23 are guided to the lower part of the guide groove 33, and the holder 23
Then, the cartridge 48 is lowered. As the driving body 5 moves forward, the push arm 51 separates from the arm portion 52, and as the holder 23 descends, the downward support of the arm receiving portion 44 is removed, so the damper arm 41 begins to rotate due to the elasticity of the spring 43. Since the rotation of the damper arm 41 is resisted by the rotary damper 42, the rotation speed is such that the elastic force of the spring 43 and the viscous resistance, which increases in proportion to the rotation speed of the rotary damper 42, are balanced. FIG. 2 shows a state in which the damper arm 41 rotates and eventually comes into contact with the holder 23 and stops. The operation up to this point is no different from the conventional example.

Next, the operation of lifting the holder 23 by pushing the driver 5 backward against the elasticity of the tension spring 12 in order to take out the cartridge 48 will be described. FIG. 3 shows a state in which the driver 5 is pushed in the direction of arrow A by about half of the total movement distance. In this state, the upper and lower guide pins 24 of the holder 23 are in the middle of the guide groove 33 and have already partially lifted the arm receiving portion 44 in the direction of arrow B. As a result, the arm portion 45 of the damper arm 41 is separated from the arm portion 50 of the damper cam 49 and rotates independently. Damper arm 4
1 can be rotated with only the resistance of the elastic force of the spring 43, so the resistance to the upward movement of the holder 23 is small. Furthermore, the driving body 5
is pushed in the direction of arrow A, the pushing arm 51 moves the damper cam 49
The damper cam 49 is brought into contact with the arm 52 of the damper arm 41, and moves the damper cam 49 back toward the damper arm 41 as the driver 5 moves. The operation of detaching the cartridge lid 48 from the holder 23 other than the above is the same as that of the conventional example, and therefore a description thereof will be omitted. As described above, according to this embodiment, the holder 23 of the cartridge 48
During the detachment operation, the resistance force of the rotary damper 42 is directly transmitted to the driver 5, and the resistance force of the rotary damper 42 causes the damper arm 41, pin 40, and support plate 3 to
9 and the holder 23 can be eliminated,
Furthermore, since the damper cam 49 is directly rotated by pressing the driving body 5, loss of force due to transmission and amplification of resistance force are eliminated, and the detachment operation of the cartridge 48 can be performed with less pressing against the driving body 5. can.

0012

Effects of the Invention As is clear from the above embodiments, the present invention has a magnetic head mounted on a cam portion of a rotary damper that moves up and down as the holder moves up and down, and that movement limits the movement of the damper arm that moves the magnetic head up and down. The arm part that contacts the damper arm only when moving downwards, and the arm part that contacts the driving body that generates lifting action only when lifting the holder upwards and returns the rotary damper, are provided separately. The damper effect of the damper works effectively on the magnetic head only when the magnetic head is lowered, and when the magnetic head and holder are lifted up, the damper effect is directly received by the drive body, reducing the load on parts other than the drive body and reducing the load on the drive body. This has the effect of eliminating pressure loss and amplification.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a main part of a magnetic disk device according to an embodiment of the present invention before a cartridge is inserted.

FIG. 2 is a perspective view of a main part of a magnetic disk device according to an embodiment of the present invention after a cartridge is inserted.

FIG. 3 is a perspective view of a main part of a magnetic disk device in an embodiment of the present invention during removal of a cartridge.

FIG. 4 is an exploded perspective view of a conventional magnetic disk device.

FIG. 5 is a perspective view of main parts of a conventional magnetic disk device.

FIG. 6 is a side view of the main part of the magnetic disk device before cartridge insertion.

[Explanation of symbols]

1... Support board, 2, 6... Bottom plate, 3, 7... Side plate,
4... Rear plate, 5... Drive body, 8, 17, 40
...Pin, 9...Elongated hole, 10, 11, 27, 31...
Spring hook, 12... Tension spring, 13... Trigger lever, 14... Cylindrical part, 15... Engagement projection,
16...Cam part, 18, 32, 43...Spring, 19
...Retaining ring, 20...Latching groove, 21...Trigger part,
22... Side wall, 23... Holder, 24... Upper and lower guide pin, 25... Front and rear guide pin, 26... Guide shaft, 28... Fan-shaped opening, 29... Shutter lever, 30... Shutter pin, 33... Guide groove,
34...Groove, 35...Arm, 36...Magnetic head,
37... Support arm, 38... Damper unit, 39...
Support plate, 41... Damper arm, 42... Rotary damper, 44... Arm receiving part, 45, 50, 5
2... Arm portion, 46... Damper cam, 47... U-shaped groove, 48... Cartridge, 49... Damper cam,
51... Push arm.

Claims (1)

[Claims] 1. A supporting substrate, a driving body slidably supported by the supporting substrate, urging means for urging the driving body in one direction, and a holder that moves up and down as the driving body moves horizontally. , a trigger rotatably supported by the support substrate, capable of regulating the movement of the driving body by the urging means, and capable of being rotated by a cartridge inserted in the holder to release the restriction on the movement of the driving body; The rotary damper includes a lever, a damper arm that moves up and down as the holder moves up and down, an arm to which a magnetic head is attached that moves up and down while being supported by the damper arm, and a rotary damper that limits the movement of the damper arm. is an arm that comes into contact only when the damper arm and magnetic head move downward;
Another arm is provided, which comes into contact with the driver only when the driver moves in the direction of lifting the holder upward, and rotates the rotary damper in a direction that moves the rotary damper arm and the magnetic head upward by the operation of the driver. A magnetic disk device characterized by: