JPH061592B2 - Disk drive - Google Patents

Description

Description: TECHNICAL FIELD 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. The present invention relates to a disk drive device in which a drive pin and a drive pin engagement hole of a disk are securely 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 micro floppy disk is equipped 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. . The load torque of the frictional force and rotation loss torque is
A magnet is attached and works against rotation of a turntable that attracts the core metal and rotation of a drive pin. 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 comes to fit into the drive pin engagement 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 is performed, since slippage is required between the turntable and the core metal, the strength of the magnet cannot be increased and the fixation of the core metal during rotation of the magnetic sheet becomes unstable. There is a problem that it is easy to become.

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]

To achieve this object, a disk drive device of the present invention is characterized in that a drive pin is fixed to a motor shaft and a mounting board is rotatably attached to the motor shaft.

[Action]

Therefore, in the present invention, since the mounting board is rotatable on the motor shaft, 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 resists the load torque on the disk side. Just work. For this reason, the drive torque is sufficiently pushed down by the load torque, and the chucking is surely performed.

In addition, since there is no need to slip between the core metal and the mounting board during chucking, the magnet of the mounting board that attracts the core metal can be made sufficiently strong, and the core metal can be securely fixed when the disk 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 showing a main part 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 micro floppy disk.

In FIG. 1, a drive pin attachment member 2 made of a spring material is vertically attached to and fixed to the motor shaft 1 of the drive motor. A drive pin support member 3 is attached to the tip of the attachment member 2 perpendicularly to the attachment member 2, and a drive pin 4 is attached to the tip of the support member 3. Further, a bearing 5 having a ring plate 5A is provided on the motor shaft 1 above the mounting member 2 and on the inner side of the support member 3 to which the drive pin 4 is mounted and which stands.
Is installed. A ring-shaped magnet fixing plate 6 is horizontally mounted on a ring plate 5A of the bearing 5 which is rotatable around the motor shaft 1. Further, a ring-shaped magnet 9 for adsorbing the core metal 8 of the micro-floppy disk 7 is attached on the magnet fixing plate 6, and further, on the magnet 9, for example, a Teflon sheet or the like for softening the shock during chucking. Sheet of 10
Is attached. The bearing 5 including the ring plate 5A, the magnet fixing plate 6, the magnet 9, and the sheet 10 constitute a mounting plate 11 on which the core metal 8 is mounted.
The mounting board 11 is rotatable with respect to the motor shaft 1.
The tip of the drive pin 4 projects from the surface of the mounting board 11.

For example, a micro-floppy disk 7 driven by a disk drive having such a structure has a magnetic sheet 13 having a cored bar 8 attached at its center in a cassette 12 composed of upper and lower halves 12A and 12B. A center hole 14 into which the tip of the motor shaft 1 is inserted in the core metal 8
And a drive pin engagement hole 15 with which the drive pin 4 engages is provided at an eccentric position.

In the disk drive device, the driving force for driving the core metal 8 of the micro-floppy disk 7 is transmitted only by the drive pin 4 separated from the mounting board 11 and directly connected to the motor shaft 1. Further, the above-described mounting plate 11 rotatable with respect to the motor shaft 1 is rotated by receiving the rotational force of the rotating core metal 8 when the magnet 9 of the mounting plate 11 attracts the core metal 8.

Therefore, when the drive pin 4 is chucked in the drive pin engagement hole 15 of the cored bar 8, there is no friction between the cored bar 8 and the mounting board 11, and the frictional force between the magnetic sheet 13 and the magnetic head and the lifter are eliminated. Magnetic sheet 13 with attached non-woven fabric
All the rotational loss torque that presses the drive pin 4 is applied to the drive pin 4, and the drive pin 4 attached to the drive pin attachment member 2 of the spring material via the drive pin support member 3 can be sufficiently pushed down.

Therefore, the rotating drive pin 4 is reliably chucked in the drive pin engaging hole 15 of the cored bar 8 with respect to the cored bar 8 of the magnetic sheet 13 which is stationary by these load torques.

Further, as described above, the rotation of only the drive pin 4 that abuts against a part of the cored bar 8 before chucking works only against the load torque of the frictional force and the rotation loss torque, and these load torques are small. Therefore, it is not necessary to manage the load torque with high accuracy as in the conventional case.

Further, since there is no need to slip between the core metal 8 and the mounting board 11 during chucking, the strength of the magnet 9 of the mounting board 11 can be made sufficiently strong, and the core metal 8 is fixed when the magnetic sheet 13 rotates. Can be reliably performed.

Here, when the magnetic sheet 13 rotates, the drive pin 4 and the mounting board 11 rotate integrally, so that the center hole 1 of the core metal 8 is
There is no wear of 4.

The drive pin support member 3 to which the drive pin 4 is attached may be composed of a spring member.

Further, the present invention is applied not only to the driving device that drives the micro-floppy disk 7, 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 mounting board on which the disk is mounted is rotatable about the motor shaft, there is no friction between the core metal of the disk and the mounting board during chucking, All side load torque is applied to the drive pin. Therefore, the drive pin is pushed down sufficiently by this load torque, and the drive pin is securely chucked in the drive pin engagement hole of the core bar against the core bar that is stationary by the load torque. become.

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 made strong, the core metal can be securely fixed when the disc is driven.

[Brief description of drawings]

FIG. 1 is a sectional view showing a main part of a disk drive device according to an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1 ... Motor shaft 2 ... Drive pin mounting member 3 ... Drive pin support member 4 ... Drive pin 5 ... Bearing 5A ... Ring plate 6 ... Magnet fixing plate 7 ... Micro floppy disk 8 ... Core bar 9 ... Magnet 10 ... Sheet 11 ... Mounting Table 13 ... Magnetic sheet 14 ... Center hole 15 ... Drive pin engagement hole

Claims (1)

[Claims] 1. A disk drive device in which a drive pin is fixed to a motor shaft and a mounting board is rotatably attached to the motor shaft.