JPS6173272A - Driving system of magnetic disk driving device - Google Patents

Abstract

PURPOSE:To release a floppy disk from an attracted condition so as to eliminate the necessity of the loading and unloading device of a magnetic head and miniaturize a magnetic disk driving device, by providing a play to the power transmitting system between a driving motor and magnetic disk and rotating the driving motor in the normal direction after rotating it in the opposite direction. CONSTITUTION:A play of an angle of about 30 deg. exists between a drive hole 5 and drive pin 9 in the rotating direction. When a driving signal is given to a terminal 17 or a normally rotating signal, for example, 'H' is given to another terminal 18, a motor driving circuit 16 rotates a motor 7 in the normal direction. When a reversely rotating signal 'L' is given, the circuit 16 rotates the motor 7 in the reverse direction. When the rotation is shifted from reverse to normal even if magnetic heads 13 and 14 are attracted by a floppy disk 1, the rotating speed of the disk 1 is increased and the drive pin 9 gives such an impact as is received when beaten with a hammer to the disk 1, since no load is applied until the pin 9 hits the drive hole 5. Therefore, the disk 1 can be released from the attracted condition.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a drive system for a magnetic disk drive device.

[Problem that the invention seeks to solve]

The present inventors are working on the recent miniaturization and low cost.

We are conducting research in order to meet the demands for energy conservation, and as a means of doing so, we have omitted the loading/unloading device for the magnetic head in a floppy disk drive. It was found that if the spindle motor that was in contact with the motor was left unattended with its rotation stopped, an adhesion phenomenon occurred and the torque required to start it up was more than five times that of normal.

Therefore, if the loading/unloading device fR is to be omitted, the capacity of the spindle motor must be increased five times that of the next magnetic disk drive device by providing the loading/unloading device.

This goes against the purpose of the inventors' research, and as a result of further research, we were able to solve this problem with a relatively simple method, so we would like to provide that method. Chiru.

[Means for solving problems]

That is, the present invention provides play in the power transmission system between the drive motor and the magnetic disk, and within the range of the play, the drive motor is fully reversed and then rotated in the forward direction, thereby successfully escaping from adsorption. The principle of the invention is to use the inertial kinetic energy of the power transmission system and the rotating part of the spindle motor to escape from adsorption.

According to this method, the magnetic head loading/unloading device in the magnetic disk drive device can be completely omitted, the drive motor can be of the same capacity as the conventional device, and therefore the magnetic disk drive device can be miniaturized.
It becomes possible to promote cost reduction and energy conservation.

Embodiments of the present invention will be described below based on the drawings.

〔Example〕

The embodiment shown in the drawings is a recently developed cartridge type 3.
This figure shows an embodiment of a 5-inch floppy disk drive device VC, in which FIG. 1 is a plan view and FIG. 2 is a side view.

In Fig. 1 and Fig. 2, 1 is a 3.5-inch floppy disk stored in a butterfly cartridge 2, and 3 is a metal plate attached to the center of the disk.

A center hole 4 is provided at the center and a rectangular drive hole 5 is provided on the outside.

61''J is a hub that is moved by a spindle motor 7, and a center pin 8 provided at the center is inserted into the center hole 4, and a drive pin 9 provided on the outside is inserted into the drive hole 5, and the center pin 8 provided at the center is inserted into the drive hole 5. The attachment of the drive bin 9 is similar to that of known systems in that it has a backlash (play) of about 30 degrees in the direction of one rotation.

Reference numeral 10 denotes a carriage that attaches magnetic heads 13 and 14 to the lower base 11 and upper movable arm 12, respectively.
3.14 is constructed in a spring 15 so as to come into contact with the floppy disk 1.

FIG. 3 is a block diagram of a drive circuit according to the present invention.
is a known IO motor drive circuit.

This motor drive circuit 1 g#:j, when a drive signal is applied to the terminal 17 and a forward rotation signal, for example "H", is applied to the terminal 1B, the motor 7 is driven in the normal direction, and when a reverse rotation signal @L'' is applied, the motor 7 is Reverse.

The device of the present invention is a rotation direction signal output circuit with a timer that first applies a reverse rotation signal @D'' to the terminal 18, and after a certain period of time (in the embodiment, the time to rotate the rotor 30 degrees) forward rotation signal ``H'' to all terminals 18. 20, now start switch 1
9 is turned on, the spindle motor 7 is rotated 30 degrees in reverse, that is, counterclockwise in FIG. 1! After c30′ inversion.

Rotate forward.

Therefore, the magnetic heads 13 and 14 are connected to the floppy disk 1.
Even if it is attracted to the motor, if the rotation changes from reverse to normal, the drive pin 9 will rotate without any load until it collides with the drive hole 5, so the 9 rotation speed will increase, and the rotational kinetic energy of the rotor of the motor will cause the drive pin to Does 9 impact floppy disk 1 like a hammer? This allows the entire flow disk to be removed from suction.

According to this method, the starting torque of the motor can be increased by an order of magnitude, and the same effect as that of the method described above can be obtained.

Sufficient separation from adsorption can be achieved.

The embodiment described above has a drive hole 5 and a drive bin 9.
There is play (play) in between. Since it was applied to a GT equipped with a 3.5-inch floppy disk believer, there is a tendency for play in the power transmission system, so the conventional device could be used as is without making any special improvements to the mechanical parts. @If you are trying to apply it to a floppy disk drive device with no play in the force transmission system.

It is sufficient to provide a joint having play in the rotational direction in the power transmission system between the motor and the floppy disk.

〔Effect of the invention〕

In the conventional drive method, a magnetic head loading/unloading device is required, but according to the present invention, the magnetic head funnel/unloading device can be omitted without increasing the capacity of the spindle motor. Therefore, the size of the magnetic disk drive device can be reduced.

Although it is possible to improve the shape of the magnetic head, the disk surface, and the material in order to reduce the attraction force of the magnetic head, new technical problems arise.

However, according to the present invention, it can be easily implemented at low cost.

Although the case where the present invention is applied to a floppy disk drive device is illustrated here, it is of course possible to apply the present invention to other magnetic disk drive devices.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of the present invention, FIG. 2 is a side view thereof, and FIG. 3 is a block diagram of a drive circuit. 1...Floppy disk, 2...Cartridge. 3... Gold, ', =, 44. -, , 4...Center hole, 5...Drive hole. G: Hub, 7: Spindle motor, 8: Center pin, 9: Drive bin, 10: Carriage. 11... Lower base, 12... Upper movable arm, 13
and 14... bH air head, 15... spring, 16...
...Motor N (dynamic circuit, 17 and 18...terminals, 19
...Start switch, 20...Rotation direction signal output circuit with timer Patent applicant YE Data Group Co., Ltd.
Fujitsu Limited Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] A drive system characterized in that play is provided in a power transmission system between a drive motor and a magnetic disk, and within the range of the play, the drive motor is rotated in the reverse direction and then rotated in the forward direction.