JPH0728625Y2 - Head disk mechanism of magnetic disk drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a head loading mechanism of a magnetic disk drive for reading and writing information by contacting magnetic heads with upper and lower surfaces of a magnetic medium.

(Prior Art) A magnetic disk drive device writes information into and reads information from a magnetic medium such as an inserted floppy disk, and a pair of magnetic heads are used for reading and writing.

The magnetic heads are arranged one above the other in the magnetic disk drive, and the upper side, that is, the upper head, is lowered by a solenoid when loaded, and abuts the magnetic medium so that the two heads sandwich it.

However, the solenoid type head load mechanism has a drawback that the weight, cost, and power consumption increase because components such as a solenoid, a drive circuit, and a power source are required.

For this reason, recently, as shown in Japanese Patent Laid-Open No. 59-2268, a head load mechanism has been developed in which the solenoid is omitted and a cam mechanism is used to move the upper head up and down. This is a mechanism in which a protrusion is provided on the side of the upper head, and when the cam type bar slides, the upper head moves up and down via the protrusion.

(Problems to be solved by the invention) However, in the above head load mechanism, the magnetic medium cannot be ejected when the power supply of the magnetic disk drive is turned off during loading, and the magnetic disc is forcibly ejected. May damage the magnetic head. When the magnetic medium is slowly taken out, the upper and lower heads come into close contact with each other because the magnetic medium is being loaded. Therefore, when the power is turned on again and the cam mechanism tries to open the upper head, the gimbal spring supporting the head is deformed and the head is damaged.

Further, the conventional product has a drawback that the corrugation of the magnetic medium cannot be effectively prevented.

The present invention has been made in view of such circumstances, and an object thereof is a magnetic disk drive device capable of reliably moving the upper head up and down without using a solenoid and preventing damage due to collision of both heads. To provide a head-loading mechanism.

(Means for Solving the Problems) In order to achieve the above object, the head loading mechanism of the magnetic disk drive according to the present invention holds the upper head in the open position when it is not loaded and works with the upper head together with the opening and closing of the door. A reset lever that moves up and down, a head load arm that swivels vertically as the reset lever moves up and down, and a rotatably mounted tip of the head load arm that crosses the magnetic medium insertion path when there is no magnetic medium. The clamp lock is located between the reset lever and the clamp lock and controls the downward movement of the clamp head, and the clamp lock rotation means rotates the clamp lock away from the magnetic medium when the reset lever descends. Has been done.

(Operation) In the head load mechanism of the present invention, when the magnetic medium is inserted, the clamp lock is pushed away by the magnetic medium, and the downward regulation of the clamp head (head load arm) is released.

When the door is opened / closed in a state where the magnetic medium is inserted and the above-mentioned downward regulation is released, the reset lever moves up and down together with the upper head in conjunction with this, and the upper head abuts or separates from the magnetic medium.

Further, in the descending process of the head load arm, the clamp lock is further rotated by the lock rotating means and separated from the magnetic medium.

(Embodiment) FIG. 1 is a plan view of a magnetic disk drive 10 to which the head load mechanism of the present invention is applied, FIG. 2 is a vertical sectional front view when a door is opened, and FIG. 3 is a door closed. The vertical front view of is shown.

The bottom of the magnetic disk drive 10 is covered with a base frame 11, and an insertion slot 13 for a floppy disk 12 is formed on the right side of FIG.
Further, a door 14 is provided at the insertion opening 13, and by opening the door 14, the floppy disk 12, which is a magnetic medium, can be inserted.

A collet support lever 15 is pivotally attached to the inside of the insertion opening 13 by a support shaft 16, and the lever 15 is biased by a torsion coil spring (not shown) to pivot clockwise.

A leaf spring 17 is connected to the other end of the collet support lever 15, and an elongated reset lever 18 is locked to a part of the leaf spring 17. On the other hand, on the left side of the frame 11 in FIG.
Is fixed, and the other end of the reset lever 18 is rotatably attached to the support plate 19.

A frusto-conical collet 20 is attached to the lower surface of the leaf spring 17, and a hub 21 is provided on the frame 11 at a position corresponding to the collet 20. In addition, the shaft 22 of the hub 21 has a drive motor
23 are connected. The collet 20 descends and fits into the center hole of the floppy disk 12 while being centered, and the hub 21
The drive motor 23 serves to rotate the floppy disk 12.

Further, on the base frame 11, a lower head 24 and an upper head 25, which faces the lower head 24 and faces the lower head 24, are arranged so as to be movable in a direction shown by an arrow in FIG. The upper head 25 and the lower head 24 are in contact with the upper and lower surfaces of the floppy disk 12 to read and write information magnetically. Also, both heads
As can be seen from FIG. 1, 24 and 25 are moved in the direction of the arrow by a pulse motor 27 via a feed screw 26 so that they can come into contact with each track of the floppy disk 12 in correspondence.

The upper head 25 is pivotally supported at one end on the pulse motor side,
It is biased downward by a torsion coil spring (not shown). However, since the protrusion 28 formed on the side of the upper head 25 is placed on the reset lever 18, the upper head 25 maintains a predetermined gap with the lower head 24.

A pair of support plates 29 are fixed on the base frame 11, and an intermediate portion of a head load arm 31 is attached to the support plates 29 via a support shaft 30. The head load arm 31 has a reset lever 18 as shown in FIG.
A protrusion 32, which is arranged substantially parallel to and is formed in the middle, is placed on the reset lever 18.

A cushion 33 is attached to the lower surface of the head load arm 31, and the protruding portion 11A is provided on the facing portion of the base frame 11.
(FIG. 2) is formed. The cushion 33 holds the floppy disk 12 between itself and the protruding portion 11A to prevent waving, and when contacted, the floppy disk 12
Protect the surface of.

A support plate 34 is further provided between the support plate 19 and the support plate 29, and an amplification lever 36 is rotatably attached to the support plate 34 by a support shaft 35. A toggle spring 37 is interposed between the tip of the amplification lever 36 and the support plate 29, and the rear end of the amplification lever 3 is fitted to the pin 38 of the head load arm 31.

Therefore, the amplification lever 36 is normally biased counterclockwise in FIG. 2 by the biasing force of the toggle spring 37. However, when the head load arm 31 is rotated clockwise following the lowering of the head load arm 31, the biasing direction of the toggle spring 37 is switched to a snap type on the way as shown in FIG. Is biased clockwise. The amplification lever 36 and the toggle spring 37 constitute toggle means.

At the tip of the head load arm 31 (right side in the figure), the support shaft 39
Thus, the clamp lock 40 is rotatably attached. The clamp lock 40 is biased counterclockwise in FIG. 2 by a torsion coil spring 41, and is normally a floppy disk.
It is located across 21 insertion passages. Further, one end of a coil bar 42 is connected to the clamp lock 40, and the other end of the coil bar 42 extends below the reset lever 18 as shown in FIG. On the other hand, head load arm 31
A stopper 43 for restricting the turning of the clamp lock 40 is formed on the.

The head load mechanism of this embodiment configured as described above operates as follows.

First, when the floppy disk 12 is inserted through the insertion slot 13, the floppy disk 12 pushes the clamp lock 40 and is set on the protrusion 11A of the frame 11 and the lower head 24.

Then, when the door 14 is closed, the door 14 pivots the collet support lever 15 counterclockwise, so that the leaf spring 17 and the reset lever 18 also start descending as shown in FIG. When the leaf spring 17 descends, the collet 20 becomes a floppy disk.
The center hole 12 is fitted while being centered, and this is chucked on the hub 21.

On the other hand, as the reset lever 18 descends, the coil bar 42
(See Fig. 1) is pushed down, so clamp lock
40 further rotates and separates from the floppy disk 12 and contacts the stopper 43. At this time, since the head load arm 31 is also pushed down (clockwise turning) together with the coil bar 42,
The amplification lever 36 also rotates clockwise against the biasing force of the toggle spring 37.

When the amplification lever 36 rotates by a predetermined angle, the biasing direction of the toggle spring 37 is switched to the snap type, as can be seen from FIG. That is, since the toggle spring 37 biases the amplification lever 36 and the head load arm 31 in the clockwise direction, the cushion 33 of the head load arm 31 contacts the floppy disk 12.

In addition, the lowering of the reset lever 18 causes the upper head 25
Is also lowered by the spring biasing force and abuts on the upper surface of the floppy disk 12. The drive motor 23 is now a floppy disk.
When the head 12 is rotated, both heads 24 and 25 read and write information.

Next, when the door 14 is opened, the collet support lever 15 rotates clockwise with a predetermined spring biasing force (not shown) according to the opening, and the leaf spring 17 and the reset lever 18 also start to rise. At this time, since the protrusion 32 of the head load arm 31 is placed on the reset lever 18, the head load arm 31
Also turns upward, and the biasing force of the toggle spring 37 switches counterclockwise again during the turn. Therefore, the head load arm 31 pushes up the upper head 25 slightly via the protrusion 28, and a gap is created between the two heads 24, 25.

On the other hand, as the leaf spring 17 rises, the collet 20 separates from the floppy disk 12, and the floppy disk 12 is pushed out of the insertion opening 13 by a predetermined ejecting mechanism (not shown).

When the door 14 is closed without the floppy disk 12 inserted, the reset lever 18 is lowered and the upper head 25 is also lowered. However, as can be seen from FIG. 2, since the clamp lock 40 is positioned vertically downward, the head load arm 31 is prevented from descending, and the projection 28 of the upper head 25 is also in contact with the head load arm 31. The descent is regulated. Therefore, both heads 24 and 25 are maintained in a state where the gap is maintained, and they are surely protected without collision.

In the above embodiment, the toggle mechanism is composed of the amplification lever 36 and the toggle spring 37, but another member can be used as long as it is a member that switches the biasing direction of the head load arm 31 to a snap type. Therefore, the present invention is not limited to the above embodiment, but various modifications can be made.

(Effect of the Invention) As described above, according to the present invention, even when the door is closed without inserting the magnetic medium, the clamp lock restricts the lowering of the clamp head to prevent the collision of both heads. It can be surely protected.

Further, in the state where the magnetic medium is inserted and the above-mentioned downward regulation is released, the reset lever can be moved up and down together with the upper head in conjunction with opening and closing of the door, so that the vertical movement of the upper head can be surely performed without using a solenoid. I can do it.

Furthermore, since the clamp lock can be reliably separated from the magnetic medium by the rotating means of the clamp lock during the descending process of the head load arm, an extra load is not applied to the inserted magnetic medium and waviness of the magnetic medium is prevented. The factors that cause wear can be eliminated.

[Brief description of drawings]

FIG. 1 is an internal plan view of a magnetic disk drive to which the head load mechanism of the present invention is applied, FIG. 2 is a vertical sectional front view when a door is opened, and FIG. 3 is a vertical sectional front view when a door is closed. 10 …… magnetic disk drive, 12 …… floppy disk, 13 …… insertion slot, 14 …… door, 18 …… reset lever, 24 …… lower head, 25 …… upper head, 30 …… spindle, 31 …… Head load arm, 32 ... protrusion, 33 ... cushion, 36 ... amplification lever, 37 ... toggle spring, 4 ...
… Clamp lock, 42… Coil bar.

Claims (2)

[Scope of utility model registration request] 1. A head load mechanism of a magnetic disk drive for contacting an upper head and a lower head on both sides of an inserted magnetic medium to read and write information, wherein the upper head is held in an open position when it is not loaded, and a door is provided. When there is no magnetic medium, a reset lever that moves up and down together with the upper head in conjunction with opening and closing of the head, a head load arm that swivels vertically as the reset lever moves up and down, and a head load arm that is rotatably provided at the tip It is provided between the reset lever and the clamp lock, which is located across the insertion path of the magnetic medium and regulates the downward movement of the clamp head, and separates the clamp lock from the magnetic medium when the reset lever descends. Clamp lock rotating means for rotating the magnetic disk, and Head loading mechanism of click drive. 2. A head load mechanism for a magnetic disk drive according to claim 1, wherein the head load arm has a cushion member on the surface facing the magnetic medium.