JPH0758581B2 - Head protection device for flexible disk drive - Google Patents

Description

The present invention relates to a head protection mechanism in a flexible disk drive device.

(Prior Art) A flexible disk drive device reads a data from a medium by connecting a disk-shaped recording medium to a hub (spindle) to rotate and moving a magnetic head in the radial direction of the medium. Alternatively, the data is recorded on the medium.

In such a flexible disk drive device,
Since the magnetic head must be in contact with the medium (for example, double-sided floppy disk), the carrier that holds the magnetic head for the back side of the medium is biased toward the carrier side by the upper head that holds the magnetic head for the front side of the medium. These two magnetic heads hold the medium when the medium is loaded.

On the other hand, a gap is created between the carrier and the upper head so that the two magnetic heads do not directly contact each other and interfere with each other when the medium is not mounted in the apparatus. In this way, the magnetic head protection mechanism is provided in the flexible disk drive device in order to perform the operations related to the carrier and the upper head.

Conventionally, this type of protection device is disclosed in Japanese Patent Laid-Open No. 59-98361, "Media protection device for floppy disk drive". Hereinafter, the head protection mechanism of the flexible disk drive according to the present invention will be described in detail with reference to FIGS. 7 and 8.

FIG. 7 is a side view of the medium protection device while the medium is being loaded in the disk drive device, and FIG. 8 is a perspective view of the medium protection device when the medium is not loaded.

In these figures, 30 is a base, and a hub 31 connected to a motor (not shown), a guide shaft 33 slidably holding a carrier 32, and a clamp pace 34 are provided on the base 30. An upper head 35 is connected to the carrier 32 via a leaf spring 36 so as to be able to rise and fall. The upper head 35 is biased toward the carrier 32 by a spring 37. A first magnetic head 38 is fixed to the carrier 32, a second magnetic head 39 is fixed to the upper head 35, and an arm portion 40 protruding laterally is integrally formed.

The clamp pace 34 has a collet 41 facing the hub 31.
A clamp support plate 42 that rotatably holds (for chucking the medium) is urged by a spring (not shown) in a direction away from the hub 31, and is rotatable about a support shaft 44 as a rotation center. Installed. Clamp support plate
A support portion 45 that supports the arm portion 40 is integrally formed with the arm 42.
Then, a cam 47 that abuts the clamp support plate 42 is fixed to one end of the operation shaft 46 supported by the clamp pace 34, and an operation lever 48 is fixed to the other end thereof, and an operation lever 48 is fixed in the middle of the operation shaft 46 in the radial direction. A pin 49, which is a protruding portion that protrudes, is fixed.

Further, a clamp lock 50 is urged counterclockwise by a spring 51 on the clamp pace 34 while being supported by a support shaft 52 as a rotation fulcrum. A stopper surface 53 and a receiving portion 54 are formed on the clamp lock 50.

In such a structure, when the medium is not loaded in the disk device, the clamp lock 50 is in the vertical posture and the pin 49 of the operation shaft 46 is in the stopper surface 53 of the clamp lock 50 as shown in FIG. And the rotation operation of the operation lever 48 is blocked. As a result, rotation of the collet 41 and the upper head 35 is also prevented, and the first and second magnetic heads 3
The gap between 8 and 39 is maintained to protect the magnetic head.

Further, as shown in FIG. 7, when the medium 55 is inserted through the insertion port 56, the clamp lock 50 is pushed by the medium 55 and rotates clockwise against the spring 51. As a result, the operating lever 48 is released. That is, when the operation lever 48 is rotated, the clamp support plate 42 is pushed by the cam 47 and rotates about the support shaft 44,
The collet 41 chucks the medium 55 to the hub 31. At the same time, the upper head 35 opened to the support portion 45 is rotated by the force applied to the spring 37, and the second magnetic head 39 is brought into contact with the medium 55.

(Problems to be Solved by the Invention) However, the media (magnetic head) protection device having the above configuration has the following problems.

When the medium is not mounted in the disk drive, the clamp lock does not rotate and the operation lever is locked (there is a gap between the hub and collet), and the medium insertion port is always open because there is no door. Becomes Therefore, the surrounding dust may enter from the insertion port and adhere to the hub and collet, and further to the surface of the magnetic head, which may reduce the chucking force of the medium and cause the data read / write state to the medium. It was

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and provide a highly reliable head protection device for a flexible disk drive device which is not affected by the surrounding environment by attaching a door to the medium insertion port. .

(Means for Solving Problems) In order to solve the above problems, the present invention is configured by providing the following means in a head protection device for a flexible disk drive device.

The head protection device has an opening / closing door provided so as to close the medium insertion opening, and a collet for supporting the medium by sandwiching it with a hub interlocking with a drive motor for rotating the medium. It has a rotating arm part which can be interlocked to rotate between a first position and a second position, and a magnetic head, and is separated from the medium by a predetermined distance from a contact position where the magnetic head can contact the medium. A head load arm portion that is rotatable so as to move between the non-contact position and when the magnetic head moves toward the contact position by a predetermined amount, the magnetic head is biased toward the contact position. , The magnetic head is urged against the insertion of the medium and rotates so that the magnetic head comes to the contact position when the medium is inserted, and the magnetic head moves to the non-contact position without rotating when the medium is not inserted. To be held Clamp lock part that supports the arm part, a coil bar that is eccentrically attached to the rotation axis of the clamp lock part and that rotates the clamp lock part, and a coil bar that is connected to the rotation arm part and that interlocks with the opening and closing of the opening and closing door Press to control the rotation of the clamp lock part, and the opening / closing door is closed to rotate the rotating arm part toward the second position, so that the medium is inserted and the clamp lock part is further rotated. And a reset lever for moving the magnetic head into contact with the medium.

(Operation) According to the present invention, since the head protection device of the flexible disk drive device is configured as described above, each technical means operates as follows.

First, when the medium is inserted from the medium insertion port, the clamp lock portion rotates against the bias until it comes into contact with the medium. Next, when the opening / closing door is closed, the rotating arm portion is moved to the first position.
Rotate from the position to the second position. The reset lever that rotates with the rotation of the rotating arm unit pushes the coil bar to further rotate the clamp lock unit (for example, so that the clamp lock unit is separated from the medium), and the magnetic head moves to the contact position. The head load arm unit is rotated so as to move. As a result, the head load arm unit is biased so that the magnetic head moves to the contact position, and the magnetic head comes into contact with the medium. On the other hand, a collet provided on the rotating arm portion holds the medium with respect to a hub connected to a drive motor, which is provided below the medium, for example.

Further, when the opening / closing door is closed when the medium is not inserted, the rotating arm portion rotates from the first position to the second position, but the head load arm portion is supported by the clamp lock portion, and elastic transmission is performed. Not rotated by the part. That is, the magnetic head is located at the non-contact position.

Further, when the magnetic head is located at the contact position (when the medium is inserted and the opening / closing door is closed), the opening / closing door is opened and the rotating arm portion is rotated from the second position to the first position. At this time, the head load arm unit is rotated by the rotating arm unit until the magnetic head moves to the non-contact position.

As described above, in the present invention, it is possible to prevent dust from entering through the medium insertion port of the apparatus and prevent the dust from adhering to important parts (magnetic head, collet, etc.) in the apparatus. As a result, the holding power of the medium and the data read / write function are not deteriorated. Therefore, the conventional problems can be solved.

(Example) Hereinafter, one example of the present invention will be described in detail with reference to the drawings.

1 is a plan view of a head protection device for a flexible disk drive according to an embodiment of the present invention, FIG. 2 is a side view of the device when a medium is mounted on the head protection device shown in FIG. 1, and FIG. Figure is a perspective view showing the state of the clamp lock when the door is closed without the medium, Figure 4 is a perspective view showing the state of the clamp lock when the medium is attached and the door is closed, and Figure 5 is the medium attached. 6 is a side view when the door is closed, and FIG. 6 is a side view when the door is closed without a medium.

In these drawings, a frame 1 of the device supports a recording medium 2 (here, a double-sided floppy disk),
Drive motor 3 and hub 4 for rotating this
In order to support the lower head 5 for reading and writing data on the back surface of the floppy disk medium 2, the support portion 7 for supporting the toggle switch 6, and the head load arm 8 which rotates about the support shaft 8a. The support portion 9 and the support portion 11 for supporting the reset lever 10 are provided (see FIGS. 1 and 2).

Further, as shown in FIG. 2, the opening / closing door 13 of the insertion port 12a of the medium 2 is attached to the front panel portion 12 of the apparatus main body via the support shaft 13a. The transmission unit 14 is attached to the frame 1 via the support shaft 14a, and the arrows A and B are attached according to the opening and closing of the door 13.
Rotate in the direction. The other end of the transmission portion 14 has a hub spring 15
And the rotation of the transmission unit 14 is transmitted. The hub spring 15 has a collet 16 at the bottom for chucking the inserted medium 2 with the hub 4 fixed to the frame 1. The rotation range of this hub spring 15 is
From the position where the door 13 is closed and the collet 16 can catch the medium 2, the door 13 is opened and the collet 16 has a predetermined gap with the hub 4. The reset lever 10 has one end rotatably connected to the hub spring 15 and the other end rotatably connected to the shoulder screw 11a of the support 11. As shown in FIG. 1, the reset lever 10 is arranged between the upper head 19 and the head load arm 8 and can come into contact with a hook 8b of the head load arm 8 as described later.

The upper head 19 is for reading and writing data on the surface of the floppy disk medium 2, is arranged on the medium 2 when the medium is mounted, and has a predetermined gap from the lower head 5 at other times. A hook 19 protruding toward the head load arm 8 is provided at a central side edge of the upper head 19.
a is integrally formed. The hook 19a is located above the reset lever 10 and placed on the upper surface of the head load arm 8. Therefore, the upper head 19 rotates following the rotation of the head load arm 8. The pulse motor 20 is connected to the upper head 19 via a mechanism for accessing the upper head 19 in the radial direction of the medium 2. The detailed mechanism is omitted in the figure for the sake of simplifying the description. Further, the upper head 19 is always biased onto the head load arm 8 via the hook 19a by a known means.

The head load arm 8 is provided with an upper head 19 when the medium is inserted.
Contacts the medium 2 and the upper head 19 rotates so as to have a predetermined gap with the lower head 5 when not inserted. The upper head 19 is provided at the upper center of the head load arm 8.
Hook that can project to the side and contact the reset lever 10
The stopper 8c of the clamp lock 17 is integrally formed on the side edge portion 8b. In addition, the head load arm 8 has an arrow A.
A limiter 21 is provided to limit the rotation of the head load arm when the head load arm is rotated in the direction (see FIG. 5).

The toggle switch 6 is connected to one end of the head load arm 8 and is supported by the support shaft 7a of the support portion 7 and is an operating plate 6a.
And a spring 6b connecting the operating plate 6a and the head load arm 8. The toggle switch 6 is the second
In the state shown in the figure, the head load arm 8 is held at a position such that the upper head 19 has a predetermined gap from the lower head 5. Further, as shown in FIG. 5, when the head load arm 8 rotates in the direction of arrow A until it abuts against the limiter 21, the toggle switch 6 urges the head load arm 8 in the direction of arrow A.

The clamp lock 17 is attached to the other end of the head load arm 8 via a support shaft 17a. A return spring 22 for urging the clamp lock in the arrow B direction is provided on the support shaft 17a. The clamp lock 17 rotates in the direction of arrow A against the return spring 22 when the medium is inserted, and when the medium is not inserted, the clamp lock 17 contacts the frame 1 by the force of the return spring 22 as shown in FIG. Contact.

A coil bar 18 that can rotate the clamp lock 17 in the direction of arrow A only when the medium 2 is mounted (only when the clap lock 17 rotates a predetermined amount) is provided on the back of the clamp lock 17. (See Figures 1, 3 and 4). One end of the coil bar 18 is eccentrically attached to the clamp lock shaft 17a (as shown in FIG. 3).
Is on the same straight line when it is upright), and the other end is attached below the reset lever 10 to the frame 1. For example, when the reset lever 10 rotates in the B direction and pushes the coil bar 18 when the medium 2 is mounted, the clamp lock 17 rotates in the A direction and contacts the stopper 8c of the head load arm 8. Furthermore, the reset lever allows the coil bar
When 18 is pushed, the coil bar 18 rotates the head roll arm 8 in the direction of arrow A while bending the central portion thereof. The central portion of the coil bar 18 has a coil spring shape to reduce stress.

Next, the operation of the head protection device according to the present embodiment will be described.

First, as shown in FIG. 2, when the medium 2 is inserted through the insertion port 12a, the clamp lock 17 rotates until it comes into contact with the surface of the medium 2.

Next, when the door 13 is closed, the transmission portion 14, the hub spring 15, and the reset lever 10 start rotating in the direction of arrow B in conjunction with this. Then, the reset lever 10 becomes the coil bar 18
When the clamp lock 17 comes into contact with and is pushed away, the clamp lock 17 rotates until it comes into contact with the stopper 8c of the head load arm 8 (see FIGS. 4 and 5). Then clamp lock 17
Is integrated with the head load arm 8, and the head load arm 8 rotates in the direction of arrow A until it comes into contact with the limiter 21. This toggles the toggle switch 6,
The head load arm 8 receives tension in the direction of arrow A, the upper head 19 is installed on the medium 2, and the lower head 5
At the same time, the medium 2 is held. On the other hand, the collet 16 provided on the hub spring 15 chucks the medium 2 together with the hub 4. At this time, since the clamp lock 17 is pushed by the reset lever 10 and is in contact with the stopper 8c,
It does not interfere with the medium 2 (see FIG. 5).

Even when the medium 2 is not attached, the insertion slot 12a
The door 13 is closed to prevent dust from the inside, but at this time, the clamp lock 17 is in a state of being held in contact with the frame 1 by the return spring 22 (see FIGS. 3 and 6). Because of this, the door 13
Even when the reset lever 10 pushes the coil bar 18, the clamp lock 17, that is, the head load arm 8 does not rotate only by bending the coil bar 18. Therefore, the upper head 19 and the lower head 5 maintain a predetermined gap. On the other hand, the rotation of the hub spring 15 causes the collet 16 to move to the hub 4.
Placed inside. As a result, it is possible to prevent dust from entering through the insertion port 12 and reduce the decrease in chucking force.

(Effects of the Invention) As described in detail above, according to the present invention, the effects are as follows.

Even if no medium is loaded, dust can be prevented by closing the medium insertion port with a door, and dust will not adhere to the magnetic head, collet, or hub, which is an important part of the flexible disk drive. High performance can be fully achieved without degrading the function.

In addition, the clamp lock can hold the gap between the heads, prevent mutual interference between them, and protect the heads.
The head performance can be fully utilized.

Further, even when the medium is inserted, the clamp lock does not come into contact with the medium, a frictional load is not applied to the medium, and there is no rotational fluctuation, so that the medium life can be extended.

[Brief description of drawings]

FIG. 1 is a plan view of a head protection device for a flexible disk drive according to an embodiment of the present invention, FIG. 2 is a side view when a medium is mounted on the head protection device shown in FIG. 1, and FIG.
Figure is a perspective view showing the state of the clamp lock when the door is closed without the medium, Figure 4 is a perspective view showing the state of the clamp lock when the medium is attached and the door is closed, and Figure 5 is the medium attached. 6 is a side view of the device when the door is closed, FIG. 6 is a side view of the device when the door is closed without a medium, and FIG. 7 is a plan view of a head protection device of a conventional flexible disk drive device. 8 is a perspective view of the main part shown in FIG. 1 ... frame, 2 ... medium, 3 ... drive motor, 4 ... hub, 5 ... lower head, 6 ... toggle switch, 7,9,11 ... support, 8 ... head load arm 10 ... … Reset lever, 12 …… Panel, 13 …… Door, 14 …… Transmission, 15 …… Hub spring, 16 …… Collet, 17 …… Clamp lock, 18 …… Coil bar 19 …… Upper head, 20 …… Pulse motor, 21 …… Limiter, 22 …… Return spring.

Claims (1)

[Claims] 1. A collet for supporting a medium by sandwiching it with an opening / closing door (13) provided so as to close the medium insertion port and a hub (4) interlocking with a drive motor (3) for rotating the medium. 16)
And has a second position from the first position in conjunction with opening and closing of the opening and closing door.
And a magnetic head (19a), which has a rotating arm part (14, 15) that can rotate between the contact position and the contact position where the magnetic head can contact the medium and a non-contact position where the magnetic head is separated from the medium by a predetermined distance. A head load arm portion (8) that is rotatable so as to move between the magnetic head and a position, and is biased toward the contact position when the magnetic head moves toward the contact position by a predetermined amount. The magnetic head is urged against the insertion of the medium and rotates so that the magnetic head comes to the contact position when the medium is inserted, and when the medium is not inserted, the magnetic head does not rotate and becomes the non-contact position. A clamp lock part (17) for supporting the head load arm part so as to be held by the coil lock part, a coil bar (18) for rotating the clamp lock part, which is eccentrically attached to the rotation axis of the clamp lock part, and a rotation arm. And open the open / close door. The medium is inserted and rotated by pressing the coil bar in conjunction with closing to control the rotation of the clamp lock unit, closing the opening / closing door, and rotating the rotating arm unit toward the second position. A head protection device for a flexible disk drive, comprising: a reset lever (10) for contacting a magnetic head with a medium by further rotating a clamp lock part.