JPH0514351Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention is a magnetic disk drive device using a flexible magnetic disk called a floppy disk, and more specifically, a magnetic disk drive device that ensures contact between the magnetic disk and a magnetic head. The present invention relates to a magnetic disk drive device including a grooved stabilizing member facing a magnetic head with a magnetic disk in between.

[Prior art and its problems]

In magnetic disk drives such as floppy disk drives, it is essential to maintain stable contact between the magnetic head and the magnetic disk. It is increasingly desired to improve the contact stability.

For this reason, for example, when using a small, high-density magnetic disk with a diameter of about 2 inches, such as a floppy disk for an electronic still camera, and using the magnetic disk by rotating it at high speed, the magnetic disk must be sandwiched between the magnetic disk and the magnetic head. A grooved stabilizing member facing the magnetic head is provided to improve contact stability between the magnetic head and the magnetic disk.

Figures 4 and 5 show the conventional structure of such a stabilizing member. In the figure, 1 is a flexible magnetic disk, 1a is its center hub, 2 is a cassette (hard case) containing the magnetic disk 1, 2a is its head window, 3 is a magnetic head, and 4 is a magnetic disk.
is a stabilizing member with a groove 4a. When the cassette 2 is attached to the magnetic disk drive device, a spindle (not shown) fits into the center hole of the center hub 1a, and a shutter (not shown) moves to open the head window 2a. , the magnetic head 3 is connected to the head window 2a.
and the stabilizing member 4 are arranged to face each other with the magnetic disk 1 in between as shown in FIG.

That is, when the cassette 2 is installed, the head window 2a is opened and, for example, the stabilizing member 4 provided in the cassette housing of the magnetic disk drive device moves toward the magnetic disk 1 to stabilize the tip of the magnetic head 3. It is designed to project into the groove 4a of the member 4. Therefore, due to the cooperation between the magnetic head 3 and the lower surface of the stabilizing member 4, the magnetic disk 1 is bent as shown in FIG.

When the stabilizing member 4 as described above is provided, the stability of the so-called head touch is greatly improved compared to the case where the stabilizing member 4 is not provided. However, in the past, the stabilizing member 4 was fixed to the lower surface of an arm member, etc. that supported it, and due to variations in mounting accuracy, processing accuracy of parts, etc., it was sometimes impossible to obtain the desired head touch.

[Purpose of invention]

Therefore, an object of the present invention is to provide a stable member mounting/adjustment mechanism that eliminates the above-mentioned conventional drawbacks, tolerates dimensional errors that are unavoidable in manufacturing, and improves mounting position accuracy. It's about getting a head start.

[Summary of the idea]

In order to achieve the above object, the magnetic disk drive device according to the present invention has the following characteristics: This is roughly achieved by making each of them freely adjustable, and the details will become clear from the following examples.

[Example of idea]

Figures 1 to 3 relate to an embodiment of the present invention, in which Figure 1 is a plan view of the main part, Figures 2 and 3 are side views of the main part in different operating states, and Figure 2 is a side view of the main part in different operating states. A part is broken, and in each figure, reference numerals 1, 1a,
2, 2a, 3, 4, and 4a correspond to the conventional example.

In the figure, reference numeral 5 denotes a cassette storage body that guides and holds the cassette 2, and is installed rotatably (up and down) in the main body of the apparatus (not shown) around its base end 5a. By inserting the cassette into the cassette storage body 5, a shutter (not shown) that closes the head window 2a is opened, and by removing (ejecting) the cassette 2, the shutter is closed. And cassette 2
is inserted into the cassette storage body 5, and by pressing down and locking the cassette storage body 5 from the upper position to the lower position, the center hub 1a of the magnetic disk 1 in the cassette 2 is attached to a spindle member (not shown). At the same time, the magnetic head 3 comes into contact with the magnetic disk 1 exposed through the head window 2a, making it possible to write/read. In this writable/readable state, the stabilizing member 4 is positioned so as to face the magnetic head 3 with the magnetic disk 1 in between, as will be described later. In FIG. 1, 5b is
A window is formed in the top plate of the cassette storage body 5 so that the stabilizing member 4 can come into contact with the magnetic disk 1.
It communicates with the center hub 1a and the corresponding circular hole 5c.

7 is a support arm made of a rigid body for the stabilizing member 4; 8 is a leaf hinge made of a thin metal plate spring for holding one end of the support arm 7; 9 is a leaf hinge made of a thin metal plate spring;
A pressing spring 10 is a thin metal spring for biasing the support arm 7 in a certain direction.
Figure) is the support for the main body of the device. The leaf hinge 8 has one wide end fastened to the abutment 10 with screws 11, and its two pronged other ends fastened to the base end 7a of the support arm 7 with screws 11. The arm 7 is rotatable by a predetermined amount around the support base 10 by bending the leaf hinge 8. Further, the pressing spring 9 has its middle portion bent into a substantially dogleg shape, and its wide end is fixed to the support 10 with a screw 11, and its tapered free end is connected to the proximal end 7a of the support arm 7.
The support arm 7 is brought into elastic contact with the support arm 7, and a rotational biasing force is applied to the support arm 7 in the clockwise direction in FIGS.

When the cassette storage body 5 is in the upper position as shown in FIG. 7 is in a position where the pressure spring 9 and the leaf hinge 8 are bent and pushed upward against the pressure spring 9 as shown in FIG. The member 4 is spaced apart from the magnetic disk 1.
Further, when the cassette storage body 5 is in the downward lock position, the projection 7b is separated from the top plate of the cassette storage body 5, and the support arm 7 is rotated clockwise by the pressure spring 9, as shown in FIG. Stabilizing member 4
is in contact with the magnetic disk 1.

Reference numeral 12 denotes a column inserted into a hole 7c formed in the center of the three prongs on the free end side of the support arm 7, and its head 12a is held in contact with the upper surface of the support arm 7 to prevent it from coming off. . Further, as shown in FIG. 2, the lower end of the stabilizing member 4 is fitted into the central part of the stabilizing member 4, and a washer 13 is fitted to the annular neck at the distal end thereof, thereby preventing the lower end from coming off. The arm 7 suspends and holds the stabilizing member 4 via a support 12. Note that the support column 12 is the stabilizing member 4
The support arm 7 is fitted into the support arm 7 so as to be movable integrally with the support arm 7, and is designed to be able to swing slightly around the intermediate flange 12b with respect to the support arm 7. (Fig. 2) 14 is an adjustment spring made of a metal thin plate spring,
As shown in FIG. 1, it has a flat main body part 14a, and first limbs 14b and second limbs 14c extending diagonally downward from the flat main body part 14a and perpendicular to each other.
The flat main body portion 14a is closely attached to the lower surface of the support arm 7, and its end portion is fastened to the support arm 7 with a screw 11, and the first limb 14b has its tip held in the stable position while resisting its elasticity. A screw 11 is fixed to the upper surface of the member 4, and the tip of the second limb 14c is in elastic contact with the upper surface of the stabilizing member 4. As a result, the stabilizing member 4 is urged away from the support arm 7 by the adjustment spring 14 .

7d is a first limb (Fig. 1) extending obliquely to the free end of the support arm 7, and the tip of the first limb 7d has a
An adjustment screw 16 for adjusting the height of the stabilizing member 4 is screwed together. The tip of the adjustment screw 16 is connected to one side of the bulge 2a-1 (FIG. 1) of the opened head window 2a when the cassette storage body 5 into which the cassette 2 is inserted is locked into the lower position as described above. In this state, the adjusting screw 16 is inserted into the tip of the positioning pin 20 (FIG. 2) of the device main body that also protrudes into the bulged portion 2a-1.
The tips of the two are in contact with each other. Therefore, by rotating this adjustment screw 16, the height (Z-direction height) of the stabilizing member 4 relative to the plane of the magnetic disk 1 (magnetic head 3) can be adjusted.

Reference numeral 7e denotes a second limb (FIG. 1) extending orthogonally to the free end side of the support arm 7, and is located on the opposite side of the second limb 14c of the adjustment spring 14 with the pillar 12 as a boundary. . Reference numeral 17 denotes an adjustment screw screwed into the second limb 7e, the tip of which is brought into contact with the upper surface of the stabilizing member 4. A line segment connecting this adjustment screw 17 and the second limb 14c of the adjustment spring 14 is along the radial direction (Y direction) of the magnetic disk 1, and by rotating the adjustment screw 17, the magnetic The degree of inclination of the stabilizing member 4 within a plane (Y plane) that includes the radial component of the disk 1 and is orthogonal to the plane of the magnetic disk can be adjusted.

18 is an adjustment screw screwed into the support arm 7;
The first limb 14b of the adjustment spring 14 is located on the opposite side of the pillar, and both 14b,
18 is along the direction (X direction) perpendicular to the radius of the magnetic disk 1, and by rotating the adjustment screw 18, the line segment connecting the magnetic disk 1 is aligned ( The degree of inclination of the stabilizing member 4 in the X-direction plane can be adjusted.

As is clear from the above, by appropriately adjusting the three adjustment screws 16, 17, and 18 mentioned above, the height of the stabilizing member 4 relative to the plane of the magnetic disk 1 and the inclination of the stabilizing member 4 in two directions (X and Y directions) relative to the plane of the magnetic disk 1 can be adjusted independently, and the pressure and contact state of the stabilizing member 4 against the magnetic disk 1, in other words the contact state between the magnetic disk 1 and the magnetic head 3, can be optimized.

[Effect of idea]

As described above, according to the present invention, even if there are dimensional errors in the stable member and its related parts that are unavoidable during manufacturing,
The above-mentioned adjustment mechanism allows the stabilizing member to be positioned at the optimum position at all times, and also improves mounting accuracy, thereby providing a magnetic disk drive device with good head touch and high read/write characteristics. Its practical value is remarkable.

[Brief explanation of the drawing]

Figures 1 to 3 relate to an embodiment of the present invention, in which Figure 1 is a plan view of the main part, Figures 2 and 3 are side views of the main part in different operating states, and Figures 4 and 5. FIG. 1 is a plan view of a main part and an enlarged side view of a main part showing a conventional stabilizing member. 1... Magnetic disk, 1a... Center hub,
2...cassette, 2a...head window, 3...
...Magnetic head, 4...Stabilizing member, 4a...Groove, 5
...Cassette storage body, 7...Support arm, 8...
Leaf hinge, 9...pressing spring, 10...abutment,
11...screw, 12...post, 14...adjustment spring, 16, 17, 18...adjustment screw.

Claims (1)

[Scope of claim for utility model registration] An abutment, a magnetic head mounted on the abutment, a support arm whose base end is engaged with the abutment via a hinge, and a groove suspended and held by the support arm. The magnetic head and the stabilizing member are arranged to face each other with a flexible magnetic disk in between.
In a magnetic disk drive device that transports a magnetic head while bending the magnetic disk at the tip of the magnetic head and protruding the tip of the magnetic head into the groove of the stabilizing member, the stabilizing member is inserted into the center of the magnetic disk drive device. The support arm is suspended and held by a single post that is integrated with the stabilizing member, and the post is inserted through a hole drilled in the support arm, and the support arm is slightly tilted around the hakama part near the head of the support arm. It is designed to be able to swing a small amount, and the support arm is placed near the free end of the support arm and is placed approximately 90 degrees apart around the height adjustment screw and the support insertion hole, which makes contact with the support base, making it stable. Equipped with two tilt adjustment screws that come into contact with the back of the member, and an adjustment spring that applies tilting force in the X and Y directions to the stable member provided on the opposite side of each tilt adjustment screw with the support as a boundary, The height of the stabilizing member relative to the magnetic disk plane (Z
1. A magnetic disk drive device characterized in that the degree of inclination of the stabilizing member in the X and Y directions with respect to the magnetic disk plane can be adjusted with respective screws.