JPH0237028B2 - - Google Patents

Description

TECHNICAL FIELD The present invention relates to a magnetic disk drive device for recording or reproducing signals using a microfloppy disk or a similar magnetic disk cartridge.

Prior Art A magnetic disk cartridge (microfloppy disk) in which a magnetic disk with a diameter of 86 mm or 76 mm is housed in a rigid case is already known. A magnetic disk drive device for recording or reproducing using this disk cartridge is unlocked in response to insertion of the disk cartridge into the holder, and the cartridge moves together with the holder to the disk rotation position. It is configured. By the way, in the case of a double-sided magnetic disk drive device that includes a magnetic head in contact with one side of the magnetic disk and a magnetic head in contact with the other side, if a pair of magnetic heads collide with or without the magnetic disk, , the head and disk may be damaged.

OBJECTS OF THE INVENTION Therefore, an object of the present invention is to provide a magnetic disk drive capable of bringing a magnetic head into soft contact with a magnetic disk and controlling contact and separation of the magnetic head with a relatively simple configuration. The goal is to provide equipment.

Structure of the Invention To achieve the above object, the present invention includes a disk rotation mechanism that includes a rotating body that engages with a disk of a magnetic disk cartridge and rotates the disk, and a disk rotation mechanism that rotates the disk by engaging with a disk of a magnetic disk cartridge. one magnetic head for recording or reproducing signals; the other magnetic head for recording or reproducing signals by contacting the other surface of the disk; and moving the other magnetic head from a separate position to a contact position with respect to the disk. a head support for biasing the other magnetic head to the contact position, a spring for biasing the head support in a direction perpendicular to the axial direction of the rotating body; The disc cartridge is configured to be inserted into the disc cartridge and has a disengaged position in which the disc is kept in a non-engaged state with the rotating body and an engaged position in which the disc is engaged with the rotating body. a cartridge holder configured as such, and a slide body that slides in a direction perpendicular to the axial direction of the rotating body, and the slide body moves the cartridge holder from the disengaged position. a holder moving mechanism for moving the cartridge holder to the engagement position; a slide body driving spring that applies a biasing force to the slide body in a direction to move the cartridge holder to the engagement position; The slide body is locked against the biasing force of the slide body driving spring so as to be maintained in the engaged position, and the lock is released in response to insertion of the disk cartridge into the cartridge holder. a locking mechanism configured to hold the head support at the separated position against the head support biasing spring and follow the movement of the slide based on the slide body driving spring; and a head support displacement control mechanism that enables movement of the head support to the contact position, the magnetic disk drive having a rack and a pinion meshed with the rack so as to brake the slide body. The present invention relates to a magnetic disk drive device characterized by being provided with a braking mechanism consisting of a damper coupled to the pinion.

Advantages of the Invention According to the present invention, since a braking effect is obtained by rotating the pinion by the movement of the slide body, braking of the slide body can be achieved with a simple configuration and in a small space. If the slider is braked, the magnetic head will come into contact with the disk with a buffering effect, thereby preventing damage to the head and disk.

Embodiment Next, a magnetic disk drive device according to an embodiment of the present invention will be described with reference to FIGS. 1 to 16. The magnetic disk cartridge 1, generally called a microfloppy disk, used in this device has a diameter of 86 mm, as shown in FIGS. 1 to 4.
The magnetic disk 2 is housed in a rigid case 3. Head insertion openings 6 and 7 are provided on both the front surface 4 and back surface 5 of the case 3, and these openings 6 and 7 are closed by a sliding shutter 8 when not in use. The shutter 8 is biased to the right in FIG. 1 by a spring (not shown), and in use, the shutter 8 is moved to the left against this biasing force. A recess 9 is provided at the tip of the case 3 in order to perform an opening operation by pressing the side surface of the shutter 8. The magnetic disk 2 of the disk cartridge 1 of this embodiment consists of a magnetic sheet portion 2a and a metal disk 2b mounted at the center thereof. Since the magnetic disk 2 is not rotated by being held between a hub and a clamper, an opening 10 for rotational driving is provided only on the back surface 5 of the case 3, and the metal disk 2 is opened from there.
b is exposed. This metal disc 2b is provided with a spindle insertion hole 2c and a positioning drive button insertion hole 2d.

5 to 8 show a state in which a disk is not inserted in a magnetic disk drive device that uses the disk cartridge 1 to record or reproduce signals, and FIGS. 9 to 1
Figure 2 shows the disk inserted state, and Figure 13 shows the first disc inserted.
Schematically showing the head support displacement control mechanism of the figure,
FIG. 14 schematically shows a pair of magnetic heads in contact with a magnetic disk, and FIG. 15 shows a pair of magnetic heads in contact with a magnetic disk.
The locking mechanism shown in the figure is shown, and FIG. 16 shows the holder displacement prevention mechanism shown in FIG. This disk drive is
As shown in FIGS. 6 and 14, it has one (lower) magnetic head 11 and the other (upper) magnetic head 12 disposed opposite thereto, and one magnetic head 11 is connected to the disk 2. Recording or reproducing is performed by contacting one side of the disk 2, and recording or reproducing is performed by bringing the other magnetic head 12 into contact with the other side of the disk 2. One magnetic head 11 is fixedly attached to the lower carriage 13, and the other magnetic head 12
is attached to the head support 14. The head support 14 is attached to the carriage 13 by means of a leaf spring 15.
The magnetic head 12 receives a biasing force in the direction of bringing the magnetic head 12 into contact with the disk 2. The head carriage 13 is moved in the radial direction of the disk 2 by a head positioning mechanism consisting of a stepping motor (not shown) and a rotary motion-to-linear motion conversion mechanism.

The disk rotation mechanism consists of a disk rotation motor 16 shown in FIG. 6 and a disk rotation body 17 coupled to the motor 16. The rotating body 17 engages with the metal disk 2b of the disk 2 and rotates while supporting the disk 2, and includes a spindle 17a, a magnet 17b for attracting the metal disk 2b, and a drive button 17c. . The spindle 17a is
The drive button 17c is inserted into a hole 2c provided in a metal disc 2b shown in FIG. 2, and the drive button 17c is inserted into a positioning hole 2d.

The disk cartridge 1, which is inserted from the bottom to the top in FIG. 5 and from the right to the left in FIG. ) to the engagement position (rotation position), a cartridge holder 18 is provided. As is most obvious from FIG. 6, this cartridge holder 18 includes a base 19 that supports the rear surface 5 side of the cartridge 1, and a pair of side surfaces 20, 2 that vertically rise from the base 19.
1 and a pair of elastic restraining plates 22 and 23 provided to restrain the surface 4 of the cartridge 1, including a base 19 and a pair of side surfaces 20 and 21.
is formed by bending a single metal plate into a U-shape. Guide pins 24, 25 are implanted in one side surface 20, 21, and are inserted into guide holes 26a of a support plate 26 shown in FIG. The guide hole 26a is arranged in the vertical direction in FIG.
Since it extends in the axial direction of the rotating body 17 in the figure, it guides the holder 18 in this direction.

A cartridge holder moving mechanism for moving the holder 18 in the axial direction of the rotating body 17 is constituted by the slide body 27. Like the holder 18, this slide body 27 is made by bending a metal plate into a U-shaped cross section. It consists of a pair of side parts 29 and 30 arranged parallel to the parts 20 and 21. A long hole 31 extending in the direction in which the disk cartridge 1 is inserted is provided in the bottom surface 28 of the slide body 27, into which a guide pin 33 embedded in a fixed base plate 32 is inserted. The slide body 27 is guided by this guide pin 33 and slides in the insertion direction of the cartridge 1. In order to engage the slide body 27 and the holder 18 in a fixed relationship, an inclined groove 34 is provided in the side surface 29 of the slide body 27 as shown in FIG. The pin 24 engages with the inclined groove 34.
Therefore, when the slide body 27 slides to the left in FIG. 7, the pin 24 is pressed downward by the edge of the inclined groove 34, and the holder 18 is moved together with the pin 24 from the position shown in FIG. 7 to the position shown in FIG. Move to position. Springs 35 and 36 shown in FIG. 5 bias the slide body 27 downward in FIG. That is, this spring 3
5 and 36 apply force in the direction of moving the holder 18 to the disk engagement position (rotation position) to the slide body 27.
It is given to

A locking mechanism for locking the slide body 27 against the springs 35 and 36 so that the holder 18 is kept in the non-engaging position (non-rotating position) is shown in FIGS.
It consists of a locking lever 37 shown in FIG. 5 and a locking pin 38 protruding from the slide body 27. The locking lever 37 has a recess 39 into which the pin 38 engages, and further shows a pressed portion 40 that is pressed by the cartridge 1. Moreover, this lever 37
It is rotatably supported by a shaft 41 implanted in, and is biased counterclockwise in FIGS. 5 and 15 by a torsion spring 42 shown in FIG. By inserting the cartridge 1, the pressed portion 40 is pressed,
When the lever 37 rotates clockwise in FIGS. 5 and 15 against the biasing force of the spring 42, the engagement between the pin 38 and the recess 39 is released, and the slide body 27 is released from the locking lever 37. freed from suspension.

In addition to the locking lever 37, this device has a holder displacement prevention mechanism that serves as another locking mechanism. This holder displacement prevention mechanism is shown in FIGS. 5 and 6.
16, a lever 43 for opening the shutter and preventing displacement of the holder, which has a function of opening the shutter 8 of the cartridge 1 and a function of preventing displacement of the holder, and a pin 44 protruding from the fixed base plate 32. Become. Lever 43 is holder 1
It is rotatably supported by a shaft 45 implanted in 8, and is biased counterclockwise by a spring 46 shown in FIG. The lever 43 is provided with a hanging protrusion 47 that engages with the shutter 8 as shown in FIG.
Furthermore, a notch 48 is provided at a position corresponding to the circumference of the shaft 45 with the radius being the distance from the shaft 45 to the pin 44 . Since the length of the pin 44 is set so that it almost contacts the lower surface of the lever 43 in the non-use state shown in FIGS. It is maintained in the position shown in FIGS. 5 and 6.

The head moving mechanism for bringing the upper head 12 into contact with the disk 2 in conjunction with the slide body 27 includes the head support displacement control mechanism 49 shown in FIGS. 5 and 13 and the head support 14 and spring described above. It consists of 15. The head support 14 is a spring 1
5 biases the head 12 toward the disk 2, but when not in use it is kept in a spaced position against a spring 15 as shown in FIG. To obtain this spaced position, the head support 14 is provided with an arm 50 which is pushed up when not in use.

As is clear from FIGS. 5 and 6 and FIG. 13 schematically showing the head support displacement control mechanism 49, the head support displacement control mechanism 49 includes a first lever 51, which can be called a slide body engagement lever, and a head displacement lever. The first lever 51 and the second lever 52 are engaged to form a cam mechanism. More specifically, the engagement piece 53 is rotatably supported by a shaft 54 implanted in the slide body 27.
3 engages with the first lever 51 while being biased counterclockwise by a spring 55. first lever 5
1 is rotatably supported by a shaft 56 and has an engagement surface 57 that engages with the second lever 52 . The second lever 52 is rotatably supported by a shaft 58 extending in a direction perpendicular to the shaft 56 of the first lever 51. It consists of an engaging part 59 and a second engaging part 60 that protrudes in the same direction as the shaft 58 so as to engage with the arm 50 of the head support 14, and the spring 6
1 is biased clockwise in FIG. The second lever 52 tries to rotate clockwise by the spring 61, but since the first engaging portion 59 is engaged with the first lever 51, the first lever 52
1 limits the rotation angle. On the other hand, since the first lever 51 is engaged with the slide body 27, its rotation angle is limited depending on the position of the slide body 27. As shown in FIG. 5, when the slide body 27 is locked by the locking lever 37 and positioned upward due to the disk not being inserted,
The first lever 51 is rotated clockwise in FIG.
The head support 1 is rotated counterclockwise in the figure.
The arm 50 of 4 is lifted and the head support 1
4 is rotated to the separated position shown in FIG. 6, and the upper head 12 is separated from the lower head 11. On the other hand, when the locking by the locking lever 37 is released and the slide body 27 is displaced downward as shown in FIG.
1 restriction is lifted. As a result, the second lever 52 can be rotated clockwise in FIG. 13 by the spring 61, and the second engaging portion 60 can be rotated to a lower position in FIG. Head support 1
4 is released, and the head support 14 is moved to the 10th position.
It moves to the contact position shown in the figure and FIG. 14 by the force of the spring 15.

As shown in FIG. 5, this device has a braking mechanism 62. This braking mechanism 62 is for buffering operation, and is constructed by providing a rack 63 on the slide body 27, meshing a pinion 64 with the rack 63, and coupling an oil damper 65 to the pinion 64.

Next, the operation of this device will be explained. The cartridge 1 shown in FIGS. 1 to 3 is attached to the holder 18.
is inserted in the direction perpendicular to the axial direction of the rotating body 17, that is, in the left direction in FIG. As shown in FIG. 6, the holder 18 is provided with restraining plates 22 and 23, so that the holder base 19 and the restraining plates 22,
23, the cartridge 1 moves forward, and first, the tip of the case 3 of the cartridge 1 engages with the protrusion 47 of the lever 43 for opening the shutter and preventing holder displacement, and the protrusion 47 moves into the recess 9. Get into it. When the cartridge 1 continues to be inserted, the lever 43 rotates clockwise in FIG. 5, and the protrusion 47 presses the shutter 8 to the left as shown in FIG. 4, so that the shutter 8 is opened. When the lever 43 rotates as described above, the position of the notch 48 provided here also changes, and as shown in FIG. The block is released and it becomes possible to move downward.

On the other hand, when the cartridge 1 is inserted, the pressed portion 40 provided on the locking lever 37 is pressed by the cartridge 1, and the locking lever 37 rotates clockwise in FIG. The engagement with the slide body 27 is released, and the slide body 27 can move freely. For this reason, the slide body 27 has springs 35 and 36
It slides downward as shown in Fig. 5 by the force of , and reaches the position shown in Fig. 9. At this time, since the brake mechanism 62 is added to the slide body 27, the slide body 27 moves slowly. When the slide body 27 moves to the right in FIG. 7, the pin 24 of the holder 18 is pressed downward by the inclined groove 34, and the pin 24 is pushed into the guide hole 2 shown in FIG.
6a and is displaced downward, and the holder 18 is also displaced downward. When the holder 18 is displaced downward as shown in FIG. 11, the disk 2 engages with the rotating body 17 and becomes rotatable.

When the slide body 27 moves downward in FIG. 5, the first lever 51 rotates counterclockwise in FIG. 13, and the second lever 52 rotates clockwise.
The position restriction of the head support 14 is released, and the upper head 12 comes into contact with the disk 2. At this time, the head support 14 rotates slowly following the slide body 27 which is braked by the braking mechanism 62 and moves slowly. Note that this timing adjustment is performed by adjusting the engagement relationship between the first lever 51 and the second lever 52.

After loading the cartridge 1 and performing predetermined recording or reproduction, when taking out the cartridge 1, press the eject operation part 27a of the slide body 27 protruding as shown in FIG. Move it upward in Figure 9. As a result, the pin 24 is pushed up by the inclined groove 34 shown in FIG. 11, and the holder 18 is also moved to the position shown in FIG. 7, so that it can be taken out. As described above, when the slide body 27 moves upward in FIG. 9, the locking pin 38 enters the recess 39 as shown in FIG. 5, and locking is established. Further, since the first lever 51 is rotated clockwise in FIG. 13 by the slide body 27, the head support 14 is pushed up as shown in FIG. 6, and the head 12 is placed in the separated position.

As is clear from the above, this embodiment has the following advantages.

(A) The holder 18 is moved based on the movement of the slide body 27.
The structure is such that the upper head 12 is lowered at the same time as the lower head 11 and the upper head 12 are lowered, and a braking mechanism 62 is added to the slide body 27, so that the impact when the lower head 11 and the upper head 12 hit the disk 2 is reduced. However, damage to the head 11 and disk 2 can be prevented. Further, even if the locking by the locking lever 37 and the blocking by the blocking lever 43 are released for some reason and the slide body 27 moves while the cartridge 1 is not installed, the braking mechanism 62 is not installed. Because there are
Even if the pair of heads 11 and 12 collide directly without intervening the disk 2, damage will be reduced due to the buffering effect.

(B) A head support displacement control mechanism 49 is provided by the first and second levers 51 and 52, and the holder 1
Since the upper head 12 is guided to the contact position in conjunction with the movement of the head 8, the approach and separation of the head 12 can be controlled without a special head displacement control mechanism using a plunger solenoid.

(C) In addition to the locking mechanism of the slide body 27 by the locking lever 37, a holder displacement prevention mechanism is provided in association with the holder 18, so that the locking by the locking lever 37 is released due to vibration or erroneous operation. Even if the lever 4 is used to open the shutter and prevent holder displacement,
The slide body 27 will not move and the upper head 12 will not move in the direction of the lower head 11 unless the prevention of displacement of the holder 18 by 3 is released. Therefore, collision between the pair of heads 11 and 12 due to incorrect operation is prevented, and the heads 11 and 12 are prevented from colliding.
damage can be prevented.

(D) The holder displacement prevention mechanism is provided by providing a notch 48 in the lever 43 for opening the shutter, and inserting a pin 44 therein.
Since the structure is configured such that the block is released when the block is inserted, the structure can be simplified.

Modifications The present invention is not limited to the above-described embodiments, but can be modified, for example, as follows.

(a) Instead of the cartridge 1, it is also applicable to an apparatus using a micro floppy disk in which a magnetic disk with a diameter of 76 mm is housed in a case and a synthetic resin hub is provided in the center of the disk. In this case, the hub of the magnetic disk is held and rotated by a rotating table or spindle and a clamper facing the rotating table or spindle.

(b) The damper 65 of the braking mechanism 62 may be replaced with an air damper or the like.

(c) Move the lever 43 to open the shutter 8 and holder 18.
A mechanism for preventing displacement of the holder 18 may be provided independently, without also serving as a mechanism for preventing displacement of the holder 18. Also,
The present invention can also be applied to a device without a blocking mechanism using the lever 43.

[Brief explanation of drawings]

1 is a plan view of a disk cartridge according to an embodiment of the present invention, FIG. 2 is a bottom view of the cartridge shown in FIG. 1, FIG. 3 is a front view of the cartridge shown in FIG. 1, and FIG. 5 is a plan view showing a magnetic disk drive device according to an embodiment of the present invention; FIG. 6 is a partially omitted front view of the device shown in FIG. 5; Fig. 7 is a side view partially cut away along the - line in Fig. 5, Fig. 8 is a side view taken from the - line in Fig. 5, and Fig. 9 shows the device in Fig. 5 with the cartridge attached. Fig. 10 is a partially omitted front view of the device shown in Fig. 9, Fig. 11 is a side view with a part cut away along line XI-XI in Fig. 9, and Fig. 12 is a plan view of the device shown in Fig. 9. 9th
13 is a perspective view schematically showing the head support displacement control mechanism of the device shown in FIG. 1, and FIG. 14 is a schematic view of the head portion of the device shown in FIG. 1. 15 is a perspective view showing the locking mechanism of the device shown in FIG. 1, and FIG. 16 is a perspective view showing the shutter opening and holder displacement prevention mechanism shown in FIG. 1. 1... Magnetic disk cartridge, 2... Magnetic disk, 11... One magnetic head, 12...
The other magnetic head, 14...Head support, 15
...Plate spring, 16...Motor, 17...Rotating body,
18... Cartridge holder, 27... Slide body, 35, 36... Slide body driving spring, 37
...Latching lever, 38...Latching pin, 39...
Recessed portion, 43... Lever for shutter release and holder displacement prevention, 44... Pin, 48... Notch, 49...
... Head support displacement control mechanism, 51 ... Slide body engagement lever, 52 ... Head displacement lever, 6
2...braking mechanism.

Claims (1)

[Claims] 1. A disk rotation mechanism that includes a rotating body that engages with a disk of a magnetic disk cartridge and rotates the disk, and a mechanism that records or reproduces a signal by contacting one surface of the disk. a magnetic head for recording or reproducing signals by contacting the other surface of the disk; and a head support for moving the other magnetic head from a spaced position to a contact position with respect to the disk. a head support biasing spring that applies a biasing force to the head support in a direction to move the other magnetic head to the contact position; and inserting the disk cartridge from a direction perpendicular to the axial direction of the rotating body. a cartridge configured to take a disengaged position in which the disk is disengaged from the rotating body and an engaged position in which the disk is engaged with the rotating body; a holder; and a slide body that slides in a direction perpendicular to the axial direction of the rotating body, and the slide of the slide body moves the cartridge holder from the non-engaged position to the engaged position. a holder moving mechanism for moving the cartridge holder to the engagement position; a slide body driving spring that applies a biasing force to the slide body in a direction to move the cartridge holder to the engagement position; and a slide body driving spring for maintaining the cartridge holder in the non-engagement position. The slide body is configured to be locked against the biasing force of the slide body driving spring, and the lock is released in response to insertion of the disk cartridge into the cartridge holder. a locking mechanism that holds the head support in the separated position against the head support biasing spring and moves the head support in accordance with the movement of the slide based on the slide body drive spring; A magnetic disk drive device comprising a head support displacement control mechanism that enables movement to the contact position, comprising: a rack, a pinion meshed with the rack, and a pinion coupled to the pinion to brake the slide body; A magnetic disk drive device characterized by being provided with a braking mechanism consisting of a damper.