JPS60117463A - Magnetic disc driving device - Google Patents

Abstract

PURPOSE:To prevent damage of a head and a disc by bringing a pair of magnetic heads into contact with the disc with a buffer action. CONSTITUTION:A device is so constituted that a holder 18 falls on a basis of movement of a slide body 27 and an upper head 12 falls simultaneously, and the shock at the time when a lower head 11 and the upper head 12 strike against a disc 2 is relaxed to prevent damage of heads 11 and 12 and the disc 2 because a damping mechanism 62 is added to the slide body 27. When detention due to a detaining lever 37 and stop due to a stopping lever 43 are released by some cause with a cartridge 1 unloaded and the slide body 27 is moved, damage is reduced by the buffer action because the damping mechanism 62 is provided even if a pair of heads 11 and 12 strike against each other directly without the disc 2 between them.

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.

2. Description of the Related 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 data using this disk cartridge is configured such that the lock is released in response to insertion of the disk cartridge into a holder, and the cartridge moves together with the holder to a disk rotation position. ing. By the way, 4. In the case of a double-sided magnetic disk drive device that includes a magnetic head in contact with one surface of a magnetic disk and a magnetic head in contact with the other surface, a pair of magnetic heads may collide with or without the magnetic disk. This may cause damage to the head and disk.

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 the contact and separation of the magnetic head with a relatively simple configuration. 7. To provide equipment.
SUMMARY OF THE INVENTION To achieve the above object, the present invention provides 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 contacting one surface of the disk. one magnetic head that records or reproduces signals by contacting the other surface of the disk, and another magnetic head that records or reproduces signals by contacting the other surface of the disk, and moving the other magnetic head from a separated position to a contact position with respect to the disk. a head support for moving the other magnetic head to the contact position; a head support biasing spring for applying a biasing force to the head support in a direction to move the other magnetic head to the contact position; The disk cartridge is formed so that the disk cartridge is inserted from the direction and has a disengaged position in which the disk is kept in a non-engaged state with the rotating body and an engaged position in which the disk is engaged with the rotating body. a holder moving mechanism, such as the slide body +27) of the embodiment, for moving the cartridge holder from the non-engaging position to the engaging position; a holder moving mechanism driving spring that applies a biasing force to the holder moving mechanism in a direction to move the holder moving mechanism to the engaged position; a locking mechanism configured to lock against the biasing force of a spring and to be released from the lock in response to insertion of the disk cartridge into the cartridge holder; The head support is held at the separated position against a support biasing spring, and is enabled to move to the contact position by following the movement of the holder movement mechanism based on the holder movement mechanism drive spring. The present invention relates to a magnetic disk drive device comprising a head support displacement control mechanism and a braking mechanism for slowing the movement of the holder moving mechanism based on the holder moving mechanism driving spring.

Effects of the Invention In the above invention, the holder is displaced by the holder moving mechanism to bring one magnetic head into contact with the disk, and
The head support displacement control mechanism is operated to bring the other magnetic head into contact with the disk, and a braking mechanism is added to the holder moving mechanism. Therefore, the contact of the pair of magnetic heads with the disk is accompanied by a buffering effect, and damage to the head and the disk can be prevented. Further, since the pair of magnetic heads and the disk are brought into contact by the operation of the holder moving mechanism, the configuration can be simplified.

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 micro-floppy disk, used in this device consists of a magnetic disk (2) with a diameter of 86 mm and a rigid case (3), as shown in Figures 1 to 4. ).The head insertion opening (6) is provided on both the front surface (4) and the back surface (5) of the case (3) (this opening +61 +7 when not in use). is closed by a sliding shutter (8).The shutter (8)
It is biased toward the right in the figure 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) attached to the center of the magnetic sheet portion (2a).
It consists of Since the magnetic disk (2) is not rotated by being held between a hub and a clamper, an opening 0ω for rotational drive is provided only on the back surface (5) of the case (3), and from there the metal disk (2b) 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 a disk cartridge (1) to record or reproduce signals, and FIGS. 9 to 12 show a state in which a disk is inserted. FIG. 13 schematically shows the head support displacement control mechanism of FIG. 1, and FIG. 14 schematically shows a state in which a pair of magnetic heads are in contact with a magnetic disk.
5 shows the locking mechanism of FIG. 1, and FIG. 16 shows the holder displacement prevention mechanism of FIG. 1. As shown in FIGS. 6 and 14, this disk drive device has one (lower) magnetic head I and the other (upper) magnetic head 0 disposed opposite thereto. Head (1υ) to disk (2
) to perform recording or reproducing by bringing the other magnetic head (121 into contact with the other surface of the disk (2) to perform recording or reproducing. One magnetic head ell)
is fixedly attached to the lower carriage (131), and the other magnetic head (121 is attached to the head support (141). The head support α4 is attached to the carriage a3 by a leaf spring (1), The head carriage (131) receives a biasing force in the direction of bringing the magnetic head Cl2) into contact with the disk (2). 2) sent in the radial direction.

The disk rotation mechanism consists of a disk rotation motor shown in FIG. 6 and a disk rotation rotating body coupled to the motor. The rotating body (Iη is the metal disk (2) of the disk (2)
b), which rotates while supporting the disk (2), and includes a magnet (17b) for attracting the spindle (17a) and the metal disk (2b), and a drive button (17c).
It consists of The spindle (17a) is inserted into a hole (2C) provided in the 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. In order to guide the cartridge (1) from the non-rotating position to the engaged position (rotating position), the cartridge holder (1 second period) is provided. This cartridge holder mark "a" indicates the position of the cartridge (1) as most clearly seen in FIG. A base (II) that supports the back surface (5) side, a pair of side surfaces (A) (2) rising vertically from this base, and an elastic member provided to suppress the surface (4) of the cartridge +11. The base portion (II) and the pair of side portions (a) eυ are formed by bending a metal plate into a U-shape and inserting it into the id hole (26a). Since the guide hole (26a) extends in the vertical direction in FIG. 8, that is, in the axial direction of the rotating body an in FIG. 6, it guides the holder (181) in this direction.

The cartridge holder moving mechanism for moving the holder a& in the axial direction of the rotating body (I71) is constituted by a slide body surface.This slide body (2) is made of a metal plate with a U-shaped cross section, similar to the holder eel. It is folded,
a central bottom portion +28) parallel to the base of the holder Q8);
The side part (2) of the holder (I) rises vertically from here.
01 (a pair of side surfaces CI'9 arranged parallel to 2υ)
C301. A long hole G11l extending in the direction in which the disk cartridge (1) is inserted is provided in the bottom surface (c) of the slide body (2), into which a guide pin 0 placed on the fixed substrate is inserted. The slide body surface is guided by this guide bin (to) and the cartridge (1
) in the insertion direction. In order to engage the slide body surface and the holder part in a certain relationship, the side surface C! of the slide body surface is used. As shown in FIG. 7, an inclined groove (b) is provided in the hot water, and a holder (a pin protruding from the side surface part (i) of L81) is engaged with the inclined groove (b). Therefore, if the slide surface slides to the left in Fig. 7, the pin (material) is pressed downward by the edge of the inclined groove (material), and the holder (1) moves together with the pin (Fig. 7). 11.The spring C35)+363 shown in FIG. 5 biases the slide body @ downward in FIG. That is,
These springs (c) (to) apply a force to the slide body in the direction of moving the holder 081 to the disk engagement position (rotation position).

A locking mechanism for locking the slide body @ against the spring 051 (end) so that the holder brocade is kept in the non-engaging position (non-rotating position) is shown in FIGS. 5 and 15. Locking lever C
3η and the locking pin (c) protruding from the slide body (2)
It consists of The locking lever C17) has a concave portion 6I that the pin side engages with, and further has a suppressed portion (4G) that is pressed by the cartridge (11).
7) is rotatably supported by a shaft (4υ) embedded in the substrate CL, and is biased counterclockwise in FIGS. 5 and 15 by a torsion spring (4υ) shown in FIG. When the cartridge (1) is inserted, the suppressed part (40) is pressed, and the lever Gη rotates clockwise in FIGS. 5 and 15 against the biasing force of the spring (4). ) and the recess (39) are released, and the slide body surface is released from the locking by the locking lever Cl71.

In addition to the locking lever G'0, this device has a holder displacement prevention mechanism that functions as another locking mechanism.

This holder displacement prevention mechanism is shown in FIGS. 5, 6, and 1.
As shown in Figure 6, the shutter (8) of the cartridge 11)
A shutter opening and holder displacement prevention lever (43,
It consists of a pin (44) protruding from the fixed board C321.The lever (43 is rotatably supported by four shafts (4) implanted at the time of the holder, and is biased counterclockwise by a spring (461) shown in FIG. The lever (43 has a fourth
As shown in the figure, the hanging protrusion (4) engages with the shutter (8).
7) is provided, and a notch (48 is provided at a position corresponding to the circumference with the distance from the shaft (49) to the pin (44) as the radius and the center is the shaft (C). ) is Leno < -(4
Since the length is set so that it almost touches the bottom surface of 3, unless the pin (4) enters the notch (481), the lever @3 and holder 0 seconds should be kept in the positions shown in Figures 5 and 6. dripping

In conjunction with the slide body surface, the upper head a3 is moved to the disk (
2) is composed of the head support displacement controller 5 (4S) shown in FIGS. 5 and 13, and the already explained head support I and spring (19). The head α2 is biased toward the disk (2) by a spring (151), but when not in use, the head α2 is kept at a separated position as shown in FIG. 6 against the force of the spring (IJK). Therefore, the head support I
An arm polish is provided on the arm, 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, the head support displacement control mechanism consists of a first lever 6υ, which can be called a slide body engagement lever, and a head displacement lever. A second lever that can be called (52
The first lever 61) and the second lever (521) are engaged to form a cam mechanism. An engaging piece 53) is rotatably supported, and the engaging piece 53) engages with the first lever (511) while being biased counterclockwise by a spring (55). Lever 6
℃ is rotatably supported on a shaft (56), and the second lever 5
2). The second lever (521 is rotatably supported by a shaft 68) extending perpendicular to the shaft 66) of the first lever (5), and is suspended so as to engage with the first lever 6υ. The first engaging part (II! 8) that protrudes in the same direction as the egg and the second engaging part (II!8) that protrudes in the same direction as the egg 60), and the 13th
It is biased clockwise in the figure. The second lever 52 tries to rotate clockwise with a spring (6υ), but since the first engaging part (elastic) is engaged with the first lever 6υ,
The rotation angle is limited by the lever (5υ).On the other hand,
Since the first lever 6υ is engaged with the force of the slide body Q, its rotation angle is limited depending on the position of the slide body 2η.As shown in FIG. Therefore, when the slide body Qη is locked by the locking lever 0η and positioned upward, the first lever 6υ is rotated clockwise in FIG. 13, and the second lever ( 5 is rotated counterclockwise in Fig. 13,
The arm (50) of the head support αa is lifted, and the head support (141) is rotated to the separated position shown in FIG.
The upper head (12) is now separated from the lower head (11).

On the other hand, when the locking by the locking lever 0η is released and the slide body 1271 is displaced downward as shown in FIG. 9, the restraint of the first lever 6υ by the slide body (2) is released. As a result, the second lever (6υ) can be rotated clockwise as shown in Fig. 13 by the spring (6υ), and the second engaging part (60) can be rotated so that it is in the lower position as shown in Fig. 13. The head support body Q41 is moved, the restraint of the head support body αa is released, and the head support body Q41
is moved by the force of a spring (lω) to the contact position shown in FIGS. 10 and 14.

As shown in FIG. 5, this device has a braking mechanism (621). This braking mechanism (62) is for buffering operation, and a rack (63) is provided on the slide body (2). , here mesh the binion (6 holes), and insert the binion (64
) and an oil damper (651).

Next, the operation of this device will be explained. Insert the cartridge (1) shown in FIGS. 1 to 3 into the holder (I81) in a direction perpendicular to the axial direction of the rotating body η, that is, to the left in FIG. , as shown in Figure 6,
Since the holding plate (2a (23+) is provided, the cartridge fi+ moves forward while being restricted between the holder base - and the holding plates (22) (23), and first, the case (3) of the cartridge (1) ) engages with the four protrusions (47) for opening the shutter and preventing holder displacement, and the protrusions (4'O) enter the recesses (9).The cartridge (
1), the lever (43) rotates clockwise in Fig. 5, the protrusion (47) presses the shutter (8) to the left as shown in Fig. 4, and the shutter (8) When the lever (43) rotates as described above, the position of the notch decoy provided here also changes, and as shown in FIG. 9, the position of the pin (44J and the position of the notch (48) match, the lever (43) and the holder (18) are released from being blocked and can be displaced downward.

On the other hand, by inserting the cartridge (1), the locking lever 0
7), the suppressed portion (40) provided in the cartridge fi
+ is pressed, the locking lever (371) rotates clockwise in Figure 5, and the engagement between the pin and the four parts is released.
The slide body opening can move freely. Therefore, the slide body (271 is a spring C39 (support)) slides downward in FIG. 5 and reaches the position shown in FIG. 9. At this time, slide body (2
Since a braking mechanism is added to n, the slide surface moves slowly. When the slide body t2 force moves to the right in Fig. 7, the pin (2) of the holder (18)
) is pressed downward, the pin (241) is guided by the guide hole (26a) shown in FIG. 8 and is displaced downward, and the holder (
18) is also displaced downward. If the holder 08) is displaced downward as shown in FIG.
, and becomes rotatable.

When the slide body (2) moves downward in Fig. 5, the first
The lever 6υ rotates counterclockwise in FIG. 13, and the second lever (521 rotates clockwise, and the head support
The position restriction is released, and the upper head C12+ comes into contact with the disk (2). At this time, the head support side is braked by the braking mechanism (62) and rotates slowly following the slide body (2η). Note that this timing can be adjusted using the first lever 51. This is done by adjusting the engagement relationship between the lever and the second lever.

After loading the cartridge tl+ and performing predetermined recording or reproduction, when taking out the cartridge (1), press the eject operation part (27a) of the protruding slide body +27) as shown in FIG. 9, Slide body (
271 is moved upward in FIG. This allows the first
The pin (goods) is pushed up by the inclined groove C34+ shown in FIG. 1, and the holder α mark also moves to the position shown in FIG. 7, making it ready for removal. As mentioned above, when the slide body opening moves upward in FIG. 9, the locking pin lock moves into the recess 09 as shown in FIG.
) and locking is established.

Further, since the first lever 60 is rotated clockwise in FIG. 13 by the slide member (2η), the head support side 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.

The structure is such that the slide body (holder α8) descends based on the movement of the two parts, and the upper head rod simultaneously descends, and since the brake mechanism (62) is added to the slide body (2), the disc (2) to reduce the impact when the lower head Ql) and upper head (12+ hit),
111C12) and the disk (2) can be prevented from being damaged. In addition, when the cartridge fi+ is not installed, even if the locking by the locking lever C17 and the blocking by the blocking lever (4) are released for some reason, and the slide body (2η) moves, Since a braking mechanism is provided, a pair of heads'' (11) α2 are connected to the disc (2).
Even if there is a direct collision without intervening, the cushioning effect will reduce damage.

2) A head support displacement control mechanism (49) is provided using the first and second levers I5υ to guide the upper head a to the contact position in conjunction with the movement of the holder θ arm, so the plunger solenoid The approach and separation of the head (121) can be controlled without a special head displacement control mechanism.

(In addition to the locking mechanism of the slide body @ by the 0 locking lever η, a holder displacement prevention mechanism is provided in association with the holder (181), so that the locking by the locking lever 0η may be released due to vibration or erroneous operation. Even if the shutter opening and holder displacement prevention lever (43) does not release the holder (I81), the slide body surface will not move and the upper head (12) will not move in the direction of the lower head (11). Therefore, a pair of heads an (
121 can be prevented from colliding with each other, and damage to the head αυα force can be prevented.

■ Set the holder displacement prevention mechanism to the lever for opening the shutter (
43 is provided with a notch (481) so that the block is released when the pin 0 is inserted therein, so that the configuration can be simplified.

Modifications The present invention is not limited to the above-described embodiments; for example, the following modifications are possible.

Instead of the fat cartridge (1), the present invention can also be applied 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 magnetic disk is held and rotated by a knob-like rotary table or spindle and a clamper facing the magnetic disk.

(b) The damper 6 of the braking mechanism 6 may be replaced with an air damper or the like.

(C) The lever (43) may not be used both for opening the shutter (8) and for preventing the displacement of the holder αg, but a mechanism for preventing the displacement of the holder 0 (to) may be provided independently. The present invention can also be applied to devices without a blocking mechanism.

[Brief explanation of the drawing]

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. 4 is a plan view of the cartridge shown in FIG. 1. 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; Figure 7 is a side view partially cut away along the line ■-■ in Figure 5, Figure 8 is a side view taken from the line -■ in Figure 5, and Figure 9 is a side view taken along the line -■ in Figure 5.
The figure is a plan view of the device shown in FIG. 5 with a cartridge installed, and FIG. 10 is a partially omitted front view of the device shown in FIG. 9.
Fig. 11 is a side view with a part of the X [- FIG. 14 is a schematic side view of the head portion of the device of FIG. 1, and FIG. 15 is a perspective view of the locking mechanism of the device of FIG. 1. 16 are perspective views showing the shutter opening and holder displacement prevention mechanism of FIG. 1. (1)...Magnetic disk cartridge, (2)...
Magnetic disk, (111... One magnetic head, (1
2+...other magnetic head, I...head support,
(1) Leaf spring, motor, housing, rotating body, brocade, cartridge holder, ■... sliding body,
G (G)... Spring for driving the slide body, 6D... Locking lever, (To)... Locking pin, C31... Concave portion, (43... Shutter opening and holder displacement prevention lever, (44)...pin, decoy...notch, 09)...
Head support displacement control mechanism (51)...Slide body engagement lever b153...Head displacement lever 1 (62
)...Braking mechanism. Agent Takano Soujigu Ward ← Law U) Ward Prisoner

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 one magnetic head that contacts one surface of the disk to record or reproduce signals; the other magnetic head for recording or reproducing signals by contacting the other surface of the disk; a -\rad holder for moving the other magnetic head from a separate position to a contact position with respect to the disk; and the other magnetic head. a head support biasing spring that applies a biasing force to the head support in a direction that activates the magnetic head to the contact position; and a cartridge holder configured to assume a non-engaging position in which the disc is kept in a non-engaging state with the rotating body and an engaging position in which the disc is engaged in the rotating body; a holder moving mechanism for moving the holder from the disengaged position to the engaged position; and a holder moving mechanism driving spring that applies a biasing force to the holder moving mechanism in a direction to move the cartridge holder to the engaged position. and locking the holder moving mechanism against the biasing force of the holder moving mechanism driving spring so that the cartridge holder is maintained in the disengaged position, and inserting the disc cartridge into the cartridge holder. a locking mechanism configured to release the lock in response to the locking mechanism; and a locking mechanism configured to hold the head support at the separated position against the head support biasing spring and to drive the holder moving mechanism. a head support displacement control mechanism that enables the head support to move to the contact position by following the movement of the holder movement mechanism based on a spring; A magnetic disk drive device comprising: a braking mechanism for slowing movement;