JPH0132203Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] 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 using a flexible magnetic disk called a floppy disk. A hub pressing member is used to fit the center hole into the spindle shaft of the spindle member, and a grooved member is placed between the magnetic disk and facing the magnetic head to ensure contact between the magnetic disk and the magnetic head. The present invention relates to a magnetic disk drive device including a stabilizing member.

[Background of the idea]

The floppy disk for electronic still cameras, for which the general standard has currently been determined, has a metal plate (magnetic plate) installed on its center hub that is attracted and attracted by the permanent magnet of the spindle member that rotates and drives the magnetic disk. At the same time, a spring member is provided in the center hole of the center hub, and the magnetic disk is positioned by pressing the spindle shaft of the spindle member that fits into the center hole with the spring member.

Therefore, in order to push the center hole of the magnetic disk into the spindle shaft against the spring member, it is necessary to install a center hub pressing member of the magnetic disk. Since the magnetic disk was installed in such a way that the pressing force was applied even while the magnetic disk was rotating, there was a drawback that the load on the spindle motor increased.

In addition, in devices that use small-diameter, high-density magnetic disks, such as floppy disks for electronic still cameras, and which are rotated at high speed, the contact between the magnetic head and the magnetic disk must be stable. In order to improve the stability, a grooved stabilizing member is provided which sandwiches the magnetic disk and faces and contacts the magnetic head.

This stabilizing member has a structure in which it comes into contact with the magnetic disk only when the magnetic disk cassette is installed in the apparatus, the shutter window of the cassette is opened, and the magnetic disk is chucked onto the spindle member. It is necessary for escape. However, in order to adopt such a configuration,
A dedicated shift mechanism was required for the stabilizing member that was linked to the vertical movement of the cassette storage body.

[Purpose of invention]

The present invention was developed in view of the above-mentioned background technology, and aims to reduce the driving torque by lifting the center hub pressing member to release the pressing force while the magnetic disk is rotating. The object of the present invention is to simplify the mechanism by moving the stabilizing member toward the magnetic disk side in conjunction with the lifting operation of the holding member.

[Summary of the idea]

The above object of the present invention is to provide a cassette storage body which stores and holds a magnetic disk cassette and is vertically movable installed in the main body of the apparatus, a lock means for holding the lower position of the cassette storage body, and a magnetic disk cassette. A center hub pressing member is attached to the lower surface of the center hub pressing member, and a hub presser holding means installed in the cassette storage body so as to be vertically movable, and a stabilizing member having a groove formed along the radial direction of the magnetic disk are attached to the lower surface thereof, and a stabilizing member holding means installed in the cassette storage body so as to be vertically movable; raising the center hub pressing member to separate it from the center hub of the magnetic disk;
This is achieved by a magnetic disk drive device in which the stabilizing member holding means is lowered to bring the stabilizing member into contact with the magnetic disk.

[Example of idea]

Figures 1 to 5 relate to one embodiment of the present invention, with Figure 1 being a perspective view of the main parts, Figure 2 being an explanatory diagram showing the operating state of the center hub pressing member, and Figure 3 being a stabilizing member holding member. FIGS. 4 and 5 are explanatory diagrams showing the operating state of the means, and are a plan view and a cross-sectional view of the main part showing the stabilizing member.

In FIG. 1, reference numeral 1 denotes a cassette storage body installed in a magnetic disk drive device, and its supporting arms 1a,
1a is pivotally supported by the chassis of the device main body, and is rotatable (up and down) around the support arm. 2 is
The spring 3 that applies the first upward biasing force to the cassette storage body 1 is a lock arm (locking means) for maintaining the downward position of the cassette storage body 1, and is supported by a shaft 4 on the chassis. A rotating force is applied in the CW (clockwise) direction shown in the figure. 3a is a hook-shaped locking part at the tip of the lock arm 3, which has an inclined part and a locking stepped part, and is attached to the cassette storage body 1 as the cassette storage body 1 moves from the top to the bottom. The pin 6 slidably contacts the inclined portion and rotates the lock arm 3 in the CCW (counterclockwise direction) shown in the figure, and when the cassette storage body 1 reaches the lower position, the lock arm 3 is rotated by the spring 5.
It rotates in the CW direction so that the pin 6 engages with the locking step of the locking part 3a (the cassette storage body 1 is locked in the lower position).

Reference numeral 7 denotes a cassette (hard case) containing a flexible magnetic disk 8, which is inserted through the insertion opening 1b of the cassette storage body 1 when the cassette storage body 1 is in the upper position. Although not shown in the figure since it is not directly related to the gist of the present application, when the cassette 7 is inserted, the shutter slides to open the shutter window 7a (see FIG. 3), and the cassette storage body of the cassette 7 is opened. 1, the shutter is slid in the closing direction.

Reference numeral 9 denotes a first lever (stabilizing member holding means) for holding a stable member, and its bent portions 9a, 9 are attached to support plates 10, 10 fixed to the upper plate portion of the cassette storage body 1.
A is supported by a shaft 11. Reference numeral 12 denotes a stabilizing member fixed to the lower surface of one end 9b of the first lever 9. A window 1c is provided in the cassette storage body 1 so that the stabilizing member 12 can go in and out. The head window 7a of the cassette 7 is located at this point. 13 is
A spring that applies a rotational force to the first lever 9 in the CW direction in the drawing about the fulcrum of the shaft 11.Although shown schematically and simplified in FIG. 1, the spring 13 is actually attached to the shaft 11. This is realized by a helical spring (wire spring) inserted in the .

Reference numeral 14 denotes a second lever (hub presser holding means) for holding the hub presser, and its bent portion 14a,
14a is supported by a shaft 16. Reference numeral 17 denotes a center hub pressing member attached to the lower surface of the disc portion 14b, which is the free end of the second lever 14;
A circular hole 1d of the cassette storage body 1 is located at a position corresponding to 7.
is drilled. Further, the upper surface of the other end 9c of the first lever 9 is in contact with the upper surface of the disk portion 14b, and when the cassette storage body 1 is in the upper position, it is stabilized by the force of the spring 13. Part 1
2 is in a lifted state (as shown by the two-dot chain line in FIG. 3), and the center hub pressing member 17 of the second lever 14, which has been pushed down via the first lever 9, is in a lowered state (as shown in FIG. 2). (position indicated by the dotted chain line). 14
Reference numeral c denotes an arm extending from the second lever 14 to the side of the cassette storage body 1, and the tip of the arm 14c can come into contact with the top of the lock arm 3 described above.

In FIG. 2, a spindle member 18 is rotated by a motor (not shown) and includes a spindle shaft 19, a spindle hub, a ring-shaped magnet 21, and the like. Reference numerals 7b and 7b are center holes of the cassette 7, and the center hub 22 of the magnetic disk 8 inside the cassette 7 is exposed at this portion. A center hole 22 a is bored in the center of the center hub 22 , and a spring arm piece (not shown) integrally formed on the edge of the center hole 22 a allows the center hole 22 a to move when the center hole 22 a is fitted into the spindle shaft 19 . Functions as a positioning member. Further, a magnetic plate (not shown) is fixed to the lower surface of the center hub 22, and the magnetic plate is attracted to the magnet 21.

The member indicated by the two-dot chain line in FIG. By pressing the lock arm 3 to the left against a spring (not shown) that biases the lock arm 3 to the right, the engagement between the lock arm 3 and the pin 6 of the cassette storage body 1 is released. It's summery.

In FIG. 3, 24 is a magnetic head, and 25 is a carriage for carrying the magnetic head 24 and transporting it in the radial direction of the magnetic disk 8, which is driven by a stepping motor (not shown). When the magnetic disk 8 is mounted on the spindle member 18 (the cassette storage body 1 is locked in the lower position), the stabilizing member 12 comes into contact with the magnetic disk 8 as will be described later. In this contact state, the groove 12a provided on the lower surface of the stabilizing member 12 faces the transfer path of the magnetic head 24 (see FIG. 4), and the tip of the magnetic head 24 and the stabilizing member 1
2, the magnetic disk 8 is bent within the groove 12a, and the magnetic disk 8 is brought into close contact with the tip gap portion of the magnetic head 24 with appropriate contact pressure, so that reading/writing is performed. (5th
(see figure).

In the above configuration, when the cassette storage body 1 is in the upper position, the first lever 9
(stabilizing member 12) is located at the position shown by the two-dot chain line in FIG.
The lever 14 (center hub pressing member 17) is located at the two-dot chain line position in FIG. When the cassette 7 is inserted into the cassette storage body 1 in this state, the cassette 7 slightly lifts the center hub pressing member 17 against the force of the spring 13 and enters into the interior.
When pushed to a certain position, the pressing member 17 rides on the center hub 22 of the magnetic disk 8 and presses it downward. Of course, at this point the shutter of the cassette 7 is in the open position.

From this state, when the cassette storage body 1 is then pushed down against the spring 2, the aforementioned lock arm 3
Immediately before the pin 6 of the storage body 1 is locked in the locking portion 3a of the magnetic disk 8, the center hole 22a of the center hub 22 of the magnetic disk 8 pressed by the center hub pressing member 17 is inserted and fitted into the spindle shaft 19. will be combined. When the cassette storage body 1 reaches the lowest position, the lock arm 3 is rotated from the two-dot chain line position to the solid line position in FIG. 2 by the force of the spring 5, and the pin 6 is locked in the locking portion 3a. Ru. Due to this rotation of the lock arm 3, the top of the locking part 3a reaches a position where it can come into contact with the arm part 14c of the second lever 14, and resists the spring 13 (the spring 5 is stronger than the spring 13). arm part 14c
, and hold the second arm 14 at the position shown by the solid line in FIG. Therefore, the center hub pressing member 17
is separated from the center hub 22 of the magnetic disk 8. Also, due to the rotation of the second lever 14, the other end 9c of the first lever 9 that is in contact with the disk portion 14b of the second lever 14 is lifted, and the first lever 9 is moved around the fulcrum of the shaft 11. The stabilizing member 12 is brought into contact with the magnetic disk 8 from the two-dot chain line position to the solid line position in FIG.

In this state, the spindle member 18 is rotated, the magnetic head 24 is positioned on a predetermined track, and desired reading/writing is performed. At this time, the head touch is stable due to the presence of the stabilizing member 12, and since the center hub pressing member 17 is spaced apart from the center hub 22, the load on the spindle drive motor can be reduced and the motor can be made smaller. Therefore, stable rotation of the magnetic disk 8 is possible even when the magnetic disk 8 is rotated.

After reading/writing is completed, when the injector lever 23 is pressed, the pin 6 is unlocked by the lock arm 3, and the cassette storage body 1 is returned to the upper position by the spring 2, and the top of the lock arm 3 and the cassette storage body 1 are returned to the upper position. The second lever 1 is no longer in contact with the second lever 1.
4 and the first lever in contact with the second lever 14 return to the positions indicated by the two-dot chain lines in FIGS. 2 and 3, respectively, by the force of the spring 13.

[Effect of idea]

As detailed above, according to the present invention, the center hub pressing member is separated from the center hub of the magnetic disk while the magnetic disk is being driven to rotate, so the torque for rotating the magnetic disk can be reduced, and the motor Miniaturization is planned. Furthermore, since the stabilizing member is brought into contact with the magnetic disk in conjunction with the separation movement of the center hub pressing member, there is an advantage that the mechanism can be simplified.

[Brief explanation of the drawing]

Figures 1 to 5 relate to one embodiment of the present invention, with Figure 1 being a perspective view of the main parts, Figure 2 being an explanatory diagram showing the operating state of the center hub pressing member, and Figure 3 being a stabilizing member holding member. FIGS. 4 and 5 are explanatory diagrams showing the operating state of the means, and are a plan view and a cross-sectional view of the main part showing the stabilizing member. DESCRIPTION OF SYMBOLS 1...Cassette storage body, 2...Spring, 3...Lock arm (locking means), 3a...Locking part, 5
...Spring, 6...Pin, 7...Cassette, 8...
Magnetic disk, 9... First lever (stabilizing member holding means), 12... Stable member, 13... Spring, 14
...Second lever (hub presser holding means), 14c...
... Arm part, 17 ... Center hub pressing member,
18... Spindle member, 19... Spindle shaft, 22... Center hub, 23... Eject lever, 24... Magnetic head.

Claims (1)

[Scope of Claim for Utility Model Registration] A cassette storage body that stores and holds a magnetic disk cassette and is vertically movable installed in the main body of the device, a locking means for holding the cassette storage body in a lower position, and a magnetic field. A member for pressing the center hub of the disk is attached to the lower surface thereof, and a hub presser holding means installed in the cassette storage body so as to be vertically movable, and a stabilizing member having a groove formed along the radial direction of the magnetic disk are attached to the lower surface thereof. and a stable member holding means installed in the cassette storage body so as to be vertically movable;
interlocking with the locking means that operates when the cassette storage body is locked in the lower position, the hub presser holding means is raised to separate the center hub pressing member from the center hub of the magnetic disk. A magnetic disk drive device characterized in that the stabilizing member holding means is lowered to bring the stabilizing member into contact with the magnetic disk.