JPH0727702B2 - Magnetic disk device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a magnetic disk device for driving a magnetic disk such as a floppy disk.

[Conventional technology]

In a magnetic disk device that drives a double-sided recording type magnetic disk such as a floppy disk, when the magnetic disk is mounted, the magnetic disk is inserted into the device so that a pair of magnetic heads are spring-loaded via a head operating mechanism. The magnetic disk media is sandwiched by the biasing force of the magnetic disk, and when the magnetic disk is taken out, the head operating mechanism is operated to separate the pair of magnetic heads against the biasing force of the spring. , The magnetic disk is pushed out.

By the way, the urging force of the spring that causes the pair of magnetic heads to approach each other to pinch the medium of the magnetic disk requires a certain amount of strength in order to pinch the medium of the magnetic disk. Since the pair of magnetic heads collide strongly through the medium of the magnetic disk, the recording signal surface of the medium of the magnetic disk is damaged and the output of signal recording is reduced, or the magnetic head is damaged. It may happen.

Therefore, as described in, for example, Japanese Patent Laid-Open No. 60-80184, it has been proposed to incorporate a damper in the head operating mechanism and to reduce the approaching speed of the pair of magnetic heads by this damper.

[Problems to be solved by the invention]

However, in the above-described known structure, even when the magnetic disk is taken out, the damper works to increase the force required to operate the head operating mechanism, so that it is not possible to use a damper having a large ability, and therefore, the pair of There is a problem that the purpose of slowing the approach speed of the magnetic head by the damper cannot be sufficiently achieved.

Further, since the magnetic head is brought into contact with the medium of the magnetic disk by the urging force of the spring, the urging force of the spring is large at the beginning of the movement of the magnetic head, and the urging force of the spring decreases when the magnetic head approaches the medium of the magnetic disk. .

Conventionally, the damper is not used to apply braking in response to changes in the biasing force of the spring that brings the magnetic head closer to the medium of the magnetic disk.

Therefore, when the magnetic head approaches the medium of the magnetic disk, the urging force of the spring has weakened, so if the speed of approach of the magnetic head to the medium is reduced by the capacity of the damper according to the weakened urging force Then, while the biasing force of the spring has not weakened yet, the magnetic head approaches the medium by applying momentum, and the magnetic head approaches the medium without being able to sufficiently suppress the momentum of the approaching speed of the magnetic head, so the magnetic head collides with the medium. Conversely, if a damper with a large capacity is used to cancel the speed of the magnetic head approaching the media while the spring bias is large, the speed of the magnetic head approaching the media slows down. There is a problem that it takes too much time to access the media.

The present invention has been made in view of the above points, and does not require a large force for eject operation even when a damper having a large capacity is used when a magnetic disk is taken out. An object of the present invention is to provide a magnetic disk device which can perform a stable approach operation of a magnetic head to a medium while shortening an access time.

[Means for solving problems]

A magnetic disk device of the present invention includes a head operating member which is disengaged from each other and is movably provided between a first position and a second position of the head operating member and biased toward the first position. A latch member, and a magnetic head that comes into contact with and separates from the magnetic disk in conjunction with the head operating member,
By inserting the magnetic disk, the latch member is pushed from the first position to the second position, and the movement of the latch member urges the elastic member from the second position to the first position. The head operating member is released from the latch member and moved from the second position to the first position by the urging force thereof, and the magnetic head abuts the magnetic disk in conjunction with the movement of the head operating member. ,And,
By pushing the head operating member from the first position to the second position, the magnetic head is separated from the magnetic disk and the latch member is released from the head operating member in conjunction with the movement of the head operating member. In the magnetic disk device in which the magnetic disk is pushed out by the movement of the latch member, the magnetic disk device is moved from the second position to the first position by the biasing force of the lever, and the head operating member moves from the first position to the second position. And a damper operation member that moves from the first position to the second position and from the second position to the first position in conjunction with the movement from the second position to the first position, and a first damper operation member of the damper operation member. The second portion of the head operating member is engaged with the damper operating member only when moving from the second position to the first position.
And a rotary damper mechanism that slows down the moving speed from the second position to the first position, and the damper operating member moves as the damper operating member moves from the second position to the first position. When the action point that engages with the damper mechanism to operate the rotary damper mechanism moves from the rotation center side of the rotary damper mechanism to the outer peripheral side and the damper operating member moves to the first position, the above action is performed. The point and the rotation center of the rotary damper mechanism are located on a line substantially perpendicular to the extension line of the movement direction of the damper operating member.

[Action]

In the magnetic disk device of the present invention, the damper operating member engages with the rotary damper mechanism only when the head operating member that brings the magnetic head into contact with the medium of the magnetic disk moves from the second position to the first position. The rotary damper mechanism slows down the moving speed of the head operating member from the second position to the first position, and slows down the approach speed of the magnetic head to the magnetic disk.

Further, the point of action of the damper operating member acting on the rotary damper mechanism moves from the rotation center side of the rotary damper mechanism to the outer peripheral side as the damper operating member moves from the second position to the first position. Therefore, the rotational moment for rotating the rotary damper mechanism becomes large, and the damper operation member receives a small resistance from the rotary damper mechanism.

That is, as the head operating member moves from the second position to the first position side and the biasing force of the elastic member decreases, the resistance of the rotary damper mechanism applied to the head operating member decreases, and conversely, Located on the side of the second position,
While the biasing force of the elastic member is large, the head operating member receives a large resistance from the rotary damper mechanism.

Moreover, when the damper operating member is moved to the first position,
Since the point of action is farthest from the center of rotation, the damper operating member is least affected by the rotary damper mechanism.

Therefore, braking is applied according to the urging force of the elastic member that brings the magnetic head closer to the medium of the magnetic disk.

Then, when the approaching speed of the magnetic head to the medium is set to a desired speed, the capability of the rotary damper mechanism is set to be relatively small in accordance with the weakened urging force of the elastic member when the magnetic head approaches the medium. Also, the head operating member is the second
Even when the urging force of the elastic member is strong, the approach speed of the magnetic head can be slowed down, and the inertia of the magnetic head approached with momentum while the urging force of the elastic member is strong, The reduction in the speed of approach to the media will not be insufficient. This is because the damper operating member receives a large resistance from the rotary damper mechanism when the head operating member is located on the side of the second position.

〔Example〕

An embodiment in which the present invention is applied to a magnetic disk device for driving a micro floppy disk will be described below with reference to the drawings.

1 to 6, reference numeral 1 is a rectangular frame, and a front panel 2 is attached to a front end portion of the frame 1, and an insertion slot 3 having a horizontally long slit is formed in the front panel 2. A slide plate 4, which is located on the lower rear side of the mouth 3 and is substantially U-shaped in plan view as a head operating member, is provided on the frame 1 at the front, rear, left and right portions of the slide plate 4 and the front and rear of the frame 1. Due to the engagement with the guide pins 7 and 8 planted in the left and right parts, the first front position (the state shown in FIGS. 1 to 4) and the second rear position (FIGS. 5 and 6) And the slide plate 4 is provided between the projecting pieces 9 bent on both sides of the slide plate 4 and the guide pins 7 on both sides of the front part of the frame 1. Coil-shaped tension spring 10 as a stretched elastic member
Is biased toward the front first position.

A hollow frame-shaped holder 11 is provided above the slide plate 4.
This holder 11 is adapted to move the slide plate 4 by the engagement of the roller 12 pivotally supported on the front and rear parts on both sides thereof and the cam portions 13 formed on the front and rear parts on both sides of the slide plate 4 by bending notches. It is provided so as to be capable of moving up and down between a lower first position and an upper second position in an interlocking manner, and faces the insertion opening 3 of the front panel 2 at the upper second position.

A pair of guide rods 14 are provided in parallel to the rear portion of the frame 1, and a carriage 15 is supported on the pair of guide rods 14 so that the carriage 15 can be moved and adjusted in the front-rear direction. The magnetic head 16 is attached to the lower front portion of the carriage 15, and the magnetic head 17 is rotatably supported on the upper front portion of the carriage 15 in the up and down direction. Head arm 18
Via a magnetic head 16 so as to be able to come into contact with and separate from the magnetic head 16 from above, and a pressing arm 19 is pivotally supported on the upper part of the carriage 15 so as to be vertically rotatable. A coil-shaped compression spring 20 is contracted between the head arm 18 and the holder 11, and the head arm 18 is engaged with the holder 11 and the head arm 18. 4 and holder 11
Is formed so as to be vertically movable between a lower first position and an upper second position in association with the movement of the magnetic head 17, and the magnetic head 17 is attached to the lower magnetic head 16 at the lower first position. Spring 20
It comes into elastic contact with the urging force of.

A latch lever 21 as a latch member is rotatably supported in the left-right direction on the right rear portion of the frame 1, and the latch lever 21 is moved to the right by a coiled torsion spring 22 as an elastic member. On the right side of the front end of the latch lever 21, a protrusion 24 for the engaging pin 23 planted at the rear end of the right side of the slide plate 4 is projected, and the right side of the latch lever 21 is also protruded. A groove 25 for the engagement pin 23 of the slide plate 4 is formed in the portion, so that this latch lever 21 has a protrusion 24 of the latch lever 21 which is brought into contact with the engagement pin 23 of the slide plate 4 by a spring 22. 2 and the state where the slide plate 4 is moved to the rearward second position and the projecting piece 24 of the latch lever 21 is disengaged from the engaging pin 23 of the slide plate 4, the latch lever 21 is moved to the right by the spring 22. And the groove 25 moves toward the slide plate 4 To pivot between a first position of the right engaged with the engaging pin 23. Further, a curved operation portion 26 is formed on the left side portion of the latch lever 21 located on the right rear portion of the holder 11.

Further, as also shown in FIG. 7, a damper lever 31 as a damper operating member is rotatably supported on the left side of the slide plate 4 so as to be rotatable in the left-right direction, and is interlocked with the movement of the slide plate 4. 4 together with the first front position and the second rear position
The damper lever 31 has a coil tensioned between a projecting piece 32 projecting on the left side of the damper lever 31 and a projecting piece 9 on the left side of the slide plate 4. The tension spring 33 is urged to the right. Further, on the right side of the damper lever 31, a triangular pushing piece 34 having a slanted rear side is projected.

A rotary damper mechanism 35 is provided on the frame 1 at the right side of the damper lever 31. As shown in FIG. 8, the rotary damper mechanism 35 includes a rotor 38, a washer 39, a stator plate 40, a washer 39, a rotor plate 41, a washer 39, and a stator plate 40 between a base plate 36 and a case-shaped stator 37. , The pressure leaves 42 made of spring material are sequentially laminated and sandwiched, and the deformed shaft 43 at the center of the upper surface of the rotor 38 and the deformed hole 44 at the center of the rotor plate 41 are fitted together, and The protruding piece 45 at the edge is used as a locking groove for the stator 37.
When the rotor 38 is rotated, the rotor 38 is fitted with the rotor plate 41 and the stator plates 40 above and below the rotor plate 41 and oil or the like having viscosity such as grease is retained. The rotor plate 41 which rotates together with the rotor 37 is adapted to receive resistance due to viscosity such as oil and fat between the rotor plate 41 locked to the stator 37 and the upper and lower stator plates 40 which cannot rotate, as shown in FIG. The pushing piece 34 of the damper lever 31 is provided with the cutout portion 47 of the stator 37.
The spring 33 engages with the plurality of protrusions 48 on the lower surface of the rotor 38 via.

An eject button 51 for pushing the slide plate 4 from the first front position to the second rear position is operably provided on the right side of the front panel 2.

Then, when the micro floppy disk (hereinafter referred to as MFD) 52 as a magnetic disk is mounted, the slide plate 4 is in the rear second position (see FIGS. 5 and 6).
In the state shown in the figure), insert the cartridge containing the MFD52 media into the insertion slot 3 of the front panel 2 and push it in.
While the cartridge of the MFD52 enters and is held in the holder 11 which is elevated to the second position above, the MFD52
The actuating portion 26 of the latch lever 21 is pushed through the cartridge, and the latch lever 21 rotates from the first position on the right side to the second position on the left side. (The state of FIG. 1 to FIG. 4) Then, the groove 25 of the latch lever 21 becomes the engagement pin of the slide plate.
23, the slide plate 4 is released from the latch lever 21, and the slide plate 4 is pulled back by the tension spring 10 to the second rear position.
From the position of 1 to the first position of the front, and in conjunction with the advance of the slide plate 4, the holder 11 engages with each of the rollers 12 and each of the cam portions 13 of the slide plate 4 to move to the upper second position. From the position of 1 to the first position below, and the holder 11
The MFD52 cartridge inside contacts the guide pins 7 and 8 on the front, rear, left and right parts of the frame 1 to position the MFD52 in the vertical direction, and the positioning holes of the MFD52 cartridge are aligned with the guide pins 8 on both sides of the rear part of the frame 1. Engage and MFD5
2, the head arm 18 is rotated from the upper second position to the lower first position in association with the lowering of the holder 11, and the magnetic head 17 is spring-loaded.
The urging force of 20 elastically abuts the medium of the MFD 52 in the holder 11 via the holding arm 19 and the head arm 18, and sandwiches the medium of the MFD 52 between it and the lower magnetic head 16. (Note that the cartridge of the MFD52 has a shutter for protecting the medium, but this shutter is assumed to be opened by the insertion of the MFD52.) Then, the slide plate 4 is released from the latch lever 21 and the tension spring 10 is released. When moving forward to the first position, the damper lever 31 also moves forward with the slide plate 4 to the first front position in conjunction with the movement of the slide plate 4, and at this time, the pushing piece 34 of the damper lever 31 moves. Engages with the protrusion 48 of the rotor 38 of the rotary damper mechanism 35 by the spring 33 and rotates the rotor 38 by a predetermined angle, so that the forward speed of the slide plate 4 becomes slower and interlocks with the forward motion of the slide plate 4. The descending speed of the magnetic heads 17 is also slowed down, so that each magnetic head 16,1
7 without collision through MFD52 media, MFD5
The recording signal surface of the second medium will not be damaged and the output of signal recording will not be reduced, and the magnetic heads 16 and 17 will not be damaged.

Further, as shown in FIG. 7, as the rotor 38 rotates, the engaging portion P as the action point of the pushing piece 34 of the damper lever 31 and the protrusion 48 of the rotor 38 is the center of rotation of the rotary damper mechanism 35. From the distance L2 at the second position on the outer side to the distance L1 at the first position on the outer peripheral side (L2 <L1), and the rotational moment for rotating the rotor 38 changes so as to increase, so the damper lever 31 The resistance received by the rotary damper mechanism 35 decreases as the damper lever 31 moves from the first position to the second position.

That is, as the slide plate 4 moves from the second position to the first position side and the biasing force of the tension spring 10 decreases, the resistance of the rotary damper mechanism 35 applied to the slide plate 4 decreases, and Is located on the second position side and the urging force of the tension spring 10 is large, the slide plate 4
Receives a large resistance from the rotary damper mechanism 35.

Moreover, when the damper lever 31 moves to the first position,
Since the engaging portion (point of action) is farthest from the center of rotation, the damper lever 31 is least affected by the rotary damper mechanism 35.

Therefore, braking is applied according to the biasing force of the tension spring 10 that brings the magnetic head 16 closer to the medium of the MFD 52.

Then, when the approaching speed of the magnetic head 16 to the medium is set to a desired speed, the capability of the rotary damper mechanism 35 is comparatively adjusted according to the weakened urging force of the tension spring 10 when the magnetic head 16 approaches the medium. Even if it is set small, even when the slide plate 4 is located on the second position side and the biasing force of the tension spring 10 is strong, the approaching speed of the magnetic head 16 can be slowed down and the biasing force of the tension spring 10 is strong. The inertia of the magnetic head 16 approached with a force between them will not cause an insufficient reduction in the approach speed to the medium. This is because the damper lever 31 receives a large resistance from the rotary damper mechanism 35 when the slide plate 4 is located on the second position side.

Since the rotary damper mechanism 35 uses viscous resistance of oil and the like and has a very small internal frictional resistance, the urging force of the slide plate 4 by the tension spring 10 itself hardly decreases.

When the MFD 52 is removed, the eject button 51 is operated to push the slide plate 4 from the front first position to the rear second position against the tension spring 10, and the slide plate 4 is retracted. In conjunction with this, the holder 11 has its rollers 12
And the cam portions 13 of the slide plate 4 engage with each other to move upward from the lower first position to the upper second position so as to face the insertion opening 3 of the front panel 2 and interlock with the upward movement of the holder 11. The head arm 18 from the lower first position to the upper second position.
The magnetic head 17 is rotated to the position
Move away from the second media.

Then, the slide plate 4 is operated by operating the eject button 51.
When the vehicle retreats to the rear second position, the damper lever 31 also retreats to the rear second position together with the slide plate 4 in conjunction with the movement of the slide plate 4, but at this time, the damper lever 31 is pushed. The piece 34 is the protrusion of the rotor 38 of the rotary damper mechanism 35.
While sliding on 48, the damper lever 31 rotates leftward against the spring 33, and its pushing piece 34 passes through the protrusion 48 of the rotor 38,
Since the rotor 38 does not rotate, the rotary damper mechanism 35 does not resist the backward movement of the slide plate 4, and therefore, the rotary damper mechanism 35 does not increase the number of persons required to operate the eject button 51.

Then, when the slide plate 4 is retracted to the rearward second position, the engaging pin 23 of the slide plate 4 is disengaged from the protruding piece 24 of the latch lever 21, the latch lever 21 is released from the slide plate 4, and the latch lever 21 is released. Is rotated by the spring 22 from the second position on the left to the first position on the right, and the latch lever 21
The rotation of causes the operating portion 26 of the latch lever 21 to move to the holder 11
The cartridge of the MFD 52 therein is pushed out to the insertion opening 3 of the front panel 2, the groove 25 of the latch lever 21 locks the engaging pin 23 of the slide plate 4, and the latch lever 21 moves the slide plate 4 to the rear side. Hold in position 2.

The rotary damper mechanism 35 is not limited to the one using the viscosity of oil and fat as in the above-described embodiment, but may be another one. In this embodiment, the slide plate 4 as the head operating member is used. Although the damper lever 31 as a damper operating member is provided to drive the rotary damper mechanism 35 when the slide plate 4 moves from the second position to the first position, the holder 11 and the head arm 18 also move to the slide plate 4. Similarly, since it is a head operating member, a damper operating member is provided on the holder 11 and the head arm 18, and the rotary damper mechanism 35 is driven when the holder 11 and the head arm 18 move from the second position to the first position. Good.

〔The invention's effect〕

According to the present invention, the damper operating member engages with the rotary damper mechanism only when the head operating member that brings the magnetic head into contact with the medium of the magnetic disk moves from the second position to the first position. Even if a rotary damper mechanism having a large capacity is used for taking out the magnetic disk, a large force is not required for the eject operation, and the operability can be improved.

Moreover, the action point where the damper operating member acts on the rotary damper mechanism moves from the rotation center side of the rotary damper mechanism to the outer peripheral side as the damper operating member moves from the second position to the first position. As a result, the rotational moment that rotates the rotary damper mechanism increases, and the resistance that the damper operating member receives from the rotary damper mechanism decreases, so that the head operating member moves from the second position to the first position side. As the urging force of the elastic member decreases,
The resistance of the rotary damper mechanism applied to the head operating member is reduced, and conversely, the head operating member is larger than the rotary damper mechanism while it is located on the second position side and the biasing force of the elastic member is large. Receive resistance. Therefore, braking is applied according to the urging force of the elastic member that brings the magnetic head closer to the medium of the magnetic disk, and the magnetic head can perform a stable approaching action to the medium while shortening the access time to the medium. .

[Brief description of drawings]

FIG. 1 shows an embodiment of a magnetic disk device according to the present invention,
FIG. 1 is a plan view thereof, FIG. 2 is a side view in which a part thereof is shown in section, and FIGS. 3 and 5 are plan views in which a part of FIG. 1 is omitted, respectively, and FIGS. 2 is a side view in which a part of FIG. 2 is omitted, FIG. 7 is an enlarged plan view of an essential part thereof, and FIG. 8 is an exploded perspective view of a rotary damper mechanism. 4 …… Slide plate as head operating member, 10 …… Tension spring as elastic member, 17 …… Magnetic head, 21 …… Latch lever as latch member, 31 …… Damper lever as damper operating member, 35 …… Rotary damper mechanism, 52 ...
… A floppy disk as a magnetic disk.

Claims (1)

[Claims] 1. A head operating member and a latch member which are disengaged from each other and are movably provided between a first position and a second position thereof and are biased toward the first position, respectively. A magnetic head that comes into contact with and separates from the magnetic disk in association with the head operating member, and by inserting the magnetic disk, pushes the latch member from the first position to the second position. By the movement of the latch member, the head operating member, which is biased from the second position to the first position by the elastic member, is released from the latch member, and the biasing force moves the head operating member from the second position to the first position. Along with the movement of the head operating member, the magnetic head contacts the magnetic disk, and
By pushing the head operating member from the first position to the second position, the magnetic head is separated from the magnetic disk and the latch member is released from the head operating member in conjunction with the movement of the head operating member. In the magnetic disk device in which the magnetic disk is pushed out by the movement of the latch member, the magnetic disk device is moved from the second position to the first position by the biasing force of the lever, and the head operating member moves from the first position to the second position. And the first position in conjunction with the movement from the second position to the first position.
From the second position to the second position and from the second position to the first position, and a second damper operation member of the damper operation member.
A rotary damper mechanism that engages with the damper operating member only when moving from the second position to the first position to slow down the moving speed of the head operating member from the second position to the first position, As the damper operating member moves from the second position to the first position, the operating point at which the damper operating member engages with the rotary damper mechanism to operate the rotary damper mechanism is the rotary damper mechanism. When the damper operation member moves to the first position from the rotation center side of the
A magnetic disk device, wherein the point of action and the center of rotation of the rotary damper mechanism are located on a line substantially perpendicular to an extension line of the movement direction of the damper operating member.