JPH06101176B2 - Disk drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a disk drive device for rotatably driving a disk, such as a micro-floppy disk, in which a disk-shaped recording medium is housed, on a turntable. In particular, the present invention relates to a disc drive device in which a drive pin and a drive pin engagement hole of a disc are surely chucked.

[Conventional technology]

In a micro-floppy disk, a magnetic sheet that serves as a disk-shaped recording medium is housed in a cassette, a core metal is attached to the center of the magnetic sheet, and a core hole and a motor shaft are inserted into the core metal. A drive pin engaging hole with which the drive pin is engaged is formed.

A floppy disk drive device that writes or reads signals to or from such a microfloppy disk is provided with a disk drive device that rotationally drives this disk.

By the way, in the conventional disk drive device, a turntable is fixed to the tip of the motor shaft of the drive motor, and the magnet for attracting the core metal is mounted on the turntable. A drive pin that is elastically urged is attached to the turntable at an eccentric position. The drive pin receives the drive force of the drive motor and rotates together with the turntable.

In order to chuck the micro-floppy disk to such a chucking mechanism of the disk device, the frictional force between the magnetic sheet and the magnetic head and the rotational loss torque that presses the magnetic sheet with the non-woven fabric attached to the lifter are used. It The friction torque and the load torque such as the rotation loss torque act against the rotation of the turntable and the rotation of the drive pin to which the magnet is attached and which adsorbs the core metal. Further, these load torques act so as to push down the drive pin that is projecting from the turntable surface and that is elastically urged downward. Therefore, with respect to the core metal of the magnetic sheet, the rotation of which is hindered by the frictional force and the rotation loss torque, the rotating drive pin fits into the drive pin engaging hole provided in the core metal.

[Problems to be solved by the invention]

In such a conventional disk drive device, in order to perform reliable chucking, it is necessary to optimally manage the load torque such as the frictional force and the rotation loss torque, which is an unstable mechanism. Therefore, if these load torques are not appropriate, there is a problem that the core bar is attracted to the magnet on the turntable and the magnetic sheet rotates without the drive pin being chucked in the drive pin engagement hole of the core bar. Will occur.

Further, in the above-mentioned disk drive device, when chucking the disk, it is necessary to slide between the turntable and the core metal, so that the strength of the magnet cannot be increased and the core metal cannot be fixed when the magnetic sheet is rotated. There is a problem that it tends to be stable.

Therefore, the present invention has been proposed in order to solve such a conventional problem, and an object thereof is to provide a disk drive device capable of reliably chucking and securely fixing a core metal. And

[Means for solving problems]

In order to achieve this object, a disk drive device of the present invention is provided with a rotary shaft rotatably with respect to a rotor and a stator of a drive motor, a drive pin is attached to the rotor, and the rotary shaft is for disk suction. It is characterized in that the disk mounting board on which the magnet is arranged is mounted, and the braking means is arranged on this rotating shaft.

[Work]

Therefore, in the present invention, since the disk mounting board attached to the rotary shaft is rotatable with respect to the rotor and the stator of the drive motor, there is no friction between the core metal of the disk and the mounting board during chucking, and Only the rotation of the drive pin attached to the rotor acts against the load torque and braking means on the disc side. For this reason, the drive torque can be pushed down sufficiently by the action of the load torque and the braking means, and the chucking can be reliably performed.

Also, since there is no need to slip between the core metal and the mounting board during chucking, the magnet of the mounting board that absorbs the core metal can be made sufficiently strong, and the core metal can be securely fixed when the disc is driven. You can

〔Example〕

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional view of a disk drive device according to an embodiment of the present invention.

This disk drive device is used in a floppy disk drive device that writes or reads signals to and from a floppy disk, and particularly drives a microfloppy disk.

In FIG. 1, a stator coil 2 is attached to the outer peripheral portion of a stator coil attachment member 1 fixed to the chassis. A bearing 3 is attached to the inner peripheral portion of the mounting member 1, and the mounting plate rotating shaft 4 arranged at the center of the bearing 3 is rotatable by the bearing 3.
Further, the rotating shaft 4 has a bearing 5 above the bearing 3.
Is attached, and the rotor holder 6 is attached to the bearing 5, so that the rotor holder 6 is rotatable about the rotary shaft 4. A rotor magnet 7 is mounted above the stator coil 2 on the outer peripheral bottom surface of the rotor holder 6. Here, the mounting member 1 and the stator coil 2 form a stator block 8A, and the holder 6 and the rotor magnet 7 form a rotor block 8B.

A drive pin mounting member 9 made of a spring material is mounted at an eccentric position on the upper surface of the rotor holder 6 of the drive motor 8 configured as described above, and one end of the mounting member 9 is attached to the holder 6. It is raised from the top. Further, a drive pin support member 10 is erected and attached to the one end of the attachment member 9, and a drive pin engagement hole of a core metal 12 of a microfloppy disk 11 is attached to the tip of the support member 10. A drive pin 14 that engages 13 is attached.

A disk-shaped magnet fixing plate 15 is attached and fixed to the rotary shaft 4 of the mounting plate above the rotor holder 6 and in the vicinity of the tip. Further, on the fixed plate 15, a ring-shaped magnet 16 that attracts the core metal 12 is attached,
A sheet 17 such as an ethylene sheet is attached on the magnet 16 so as to reduce the impact at the time of chucking. The magnet fixing plate 15, the magnet 16, and the sheet 17 constitute a mounting board 18 on which the core 12 is mounted.

A disc-shaped brake plate 19 made of, for example, steel is attached to the lower end of the rotary shaft 4, and the brake plate 19 is attached to the bottom surface of the stator coil attachment member 1 and has a U-shaped cross section. It is fitted to the coil portion 20. The brake plate 19 and the brake coil section 20 form an electromagnetic brake 21.

For example, in a micro-floppy disk 111 driven by such a disk drive device, a magnetic sheet 23 having a cored bar 12 attached to the central portion is housed in a cassette 22 composed of upper and lower halves 22A and 22B. The gold 12 is provided with a central hole 24 into which the tip of the rotary shaft 4 is inserted, and a drive pin engaging hole 13 with which the drive pin 14 engages is provided at an eccentric position.

In the disk drive device, the rotational force generated by the stator coil 2 and the rotor magnet 7 is transmitted to the core metal 12 only by the drive pin 14 attached to the rotor holder 6.
The mounting board 18 attached to the rotary shaft 4 which is rotatable with respect to the stator block 8A and the rotor block 8B is rotated by the magnet 16 of the mounting board 18 attracting the core metal 12. It rotates by receiving the rotating force of the core metal 12. Therefore, for the rotating rotor block 8B and the core 12,
The mounting board 18, the rotating shaft 4, and the brake plate 19 rotate in synchronization.

Further, FIG. 2 is a block diagram showing a main part of a circuit of the disk drive device.

In FIG. 2, a disc mounting detection signal obtained by mounting the microfloppy disc 11 on the mounting plate 18 is input to an input terminal 26 connected to the brake control circuit unit 25. . As a result, in the control circuit section 25, the electromagnetic brake 21 (shown by B in FIG. 2) is operated and placed until the drive pin 14 is chucked in the drive pin engagement hole 13 of the core metal 12. A brake signal is generated to stop the rotation of the board 18. This brake signal is supplied to the coil 20A of the brake coil unit 20.

When the disk is driven, a drive current detection signal based on the drive current flowing through the stator coil 2 of the drive motor 8 (indicated by M in FIG. 2) is input to the control circuit section 25. A reference signal based on a steady drive current is input to the control circuit section 25 from an input terminal 27. By comparing the reference signal with the drive current detection signal, the circuit section 25
Then, the brake control signal for absorbing the product-to-product variation in the load torque related to the micro-floppy disk 11 is generated. This brake control signal is the electromagnetic brake 21
Is supplied to the coil 20A. As a result, a constant load can be constantly applied to the drive motor 8 when the disc is driven.

In the disk drive device configured as described above, when the drive pin 14 is chucked in the drive pin engagement hole 13 of the core bar 12, there is no friction between the core bar 12 and the mounting board 18, and the magnetic sheet 23 The friction loss of the magnetic head and the rotational loss torque that presses the magnetic sheet 23 with the non-woven fabric attached to the lifter are all applied to the drive pin 14, and the drive pin attachment member 9 of the spring material is provided via the drive pin support member 10. The drive pin 14 attached to the shaft can be pushed sufficiently downward.

Therefore, the rotating drive pin 14 reliably chucks the drive pin engaging hole 13 of the core bar 12 with respect to the core bar 12 of the magnetic sheet 23 which is stationary by these load torques.

Further, at the time of chucking, a brake signal is generated in the brake control circuit section 25, and the electromagnetic brake 21 is activated, so that the load torque required for chucking is further added. As a result, chucking is performed more reliably.

Further, as described above, the rotation of only the drive pin 14 that abuts against a part of the cored bar 12 before chucking acts only against the load torque such as the frictional force and the rotation loss torque, and these load torques are It can be small. Further, since the electromagnetic brake 21 is provided, it is not necessary to manage the load torque of the micro-floppy disk 11 with high accuracy as in the conventional case.

Further, since the core metal 12 and the mounting board 18 do not need to slide during chucking, the strength of the magnet 16 of the mounting board 18 can be made sufficiently strong, and the core metal 12 can be fixed when the magnetic sheet 23 rotates. It can be done reliably.

Here, when the magnetic sheet 23 rotates, the drive pin 14 and the mounting board 18 rotate integrally, so that the center hole 24 of the cored bar 12 is not worn.

Instead of using the electromagnetic brake 21 as a braking means for applying a brake to the mounting board 18, a mechanical brake for mechanically pressing the brake plate by a brake signal or a brake control signal to apply a brake may be used.

Further, the present invention is applied not only to the driving device that drives the micro-floppy disk 11, but also to the driving device that drives another disk in which the disk-shaped recording medium is housed.

〔The invention's effect〕

As described above, in the disk drive device of the present invention, since the disk mounting board attached to the rotary shaft is rotatable with respect to the rotor and the stator of the drive motor, the disk core plate and the mounting disk are mounted during chucking. There is no friction between the discs, and the load torque on the disc side and the action of the braking means are all exerted on the drive pin attached to the rotor. Therefore, the drive pin is pushed down sufficiently by the load torque and the braking means, and the drive pin is inserted into the drive pin engaging hole of the core metal with respect to the core metal stationary by the load torque and the braking means. You will surely get chucked.

Further, since there is no need for slippage between the core metal and the mounting plate, and the magnet of the mounting plate for adsorbing the core metal can be strengthened, when the disc is driven, the brake means is activated so that the product with the load torque related to the disc Can be absorbed and a constant load can be constantly applied to the drive motor.

[Brief description of drawings]

FIG. 1 is a sectional view of a disk drive device according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a main part of a circuit of the drive device. 2 …… Stator coil 3,5 …… Bearing 4 …… Mounting board rotating shaft 7 …… Rotor magnet 8A …… Stator block 8B …… Rotor block 8 …… Drive motor 9 …… Drive pin mounting member 11 …… Micro floppy disk 12 …… Core bar 13 …… Drive pin engaging hole 14 …… Drive pin 15 …… Magnet fixing plate 16 …… Magnet 17 …… Seat 18 …… Mounting board 19 …… Brake plate 20 …… Brake coil 21 …… Electromagnetic brake 23 …… Magnetic sheet 24 …… Center hole 25 …… Brake control circuit

Claims (1)

[Claims] 1. A disk mount in which a rotary shaft is rotatably provided for a rotor and a stator of a drive motor, a drive pin is attached to the rotor, and a magnet for attracting a disk is arranged on the rotary shaft. A disk drive device in which a board is mounted and brake means is arranged on this rotating shaft.