JPH0296990A - Disk driving device - Google Patents

Abstract

PURPOSE:To eliminate occurrence of damages to a disk and magnetic head by releasing a level held by an attraction type solenoid, moving a lift bar at its locking position, and causing to form a gap between the head and disk when power supply is discontinued. CONSTITUTION:When power supply is discontinued, an attraction type solenoid 17 is caused to release a working lever 10 held by the solenoid 17 so that the lever 10 can move freely. As a result, a lift bar 6 is moved to the uppermost position by the pressing force of a spring 9 and a projection 5b is pushed up so that an arm 4 can be position in the gap between a magnetic head 1 and disk. Therefore, such a case does not occur that the disk is attracted with the heads 1 and 2 being press-contacted with the disk even when this disk device is installed while the power supply is turned off and the disk is left inside. Moreover, a projection 5a is largely pushed up by means of an operating piece not shown in the figure and the arm 4 is considerably opened upward at the time of removing the disk. When the disk is inserted, the projection 5b is locked by the lift bar 6 and the arm 4 is stopped so as to stop the head 1 in the gap.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a disk drive device, and in particular to a disk drive device that prevents a magnetic head from adhering to a disk that is left without being removed from the disk drive device when the power is turned off. Regarding.

BACKGROUND ART Conventionally, in a disk drive device for driving a floppy disk, as shown in FIG. 2, an inserted disk 20 is held and rotated around a constant axis, and
Recording and reproduction is performed by pressing the magnetic heads 21 and 22 on both sides of the disk 20 C4, and by attaching the magnetic heads 21 and 22 to a carriage 23 movable in the radial direction of the disk 20 The trunk is configured to allow access to the magnetic heald 21,22.

One of the magnetic heads 21 is attached to the tip of a swingable arm 24 provided on the carriage 23, and when the disk 80 is inserted or removed, the arm 24 swings as shown by the imaginary line in FIG. By doing so, a disk insertion space is formed between the magnetic disks 21 and 22, and after the disk 20 is inserted, the arm 24 is returned to the state shown by the solid line. Therefore, the arm 24 is always urged toward the solid line state by the urging means, and when the disk 20 is inserted or removed, an operation piece (not shown) is protruded from the arm 24 and moves in conjunction with the insertion/removal operation. When the disc 20 is inserted, the arm 24 returns to the solid line state as the operating piece returns to its original position. has been done. Further, a soft load mechanism including an oil damper or the like is provided to prevent the operating piece from returning quickly and causing the magnetic head to come into impactful contact with the disk.

Problems to be Solved by the Invention By the way, in the above configuration, the magnetic head separates from the disk when inserting and ejecting the disk, but when the disk is inserted, the magnetic head remains in pressure contact with the disk at all times, and furthermore, even when the power is turned off, When set, the disc rotation will stop. Therefore, if you leave the disk unattended with the power off and forget to take it out, the magnetic head will remain in pressure contact with the disk for a long time, causing the magnetic head to stick to the disk. Problems arise when the disk is re-driven, and the disk or magnetic head may be damaged.

In addition, in a large disk drive device that drives a 5-inch floppy disk, it may be possible to use a plunger type solenoid to force the magnetic head away from the disk when the power is turned off. In a small disk drive device such as one that drives a 3.5-inch floppy disk, or even in a battery-powered disk drive device, it is impossible to use a large plunger type solenoid that consumes a large amount of current.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, it is an object of the present invention to provide a disk drive device that is small in size, consumes little power, and can move a magnetic head away from a disk when the power is turned off.

Means for Solving the Problems In order to achieve the above object, the present invention includes an arm that is biased to swing so that a magnetic head attached to the tip thereof is brought into pressure contact with a disk, and an arm that is biased to swing so as to bring the magnetic head attached to the tip into pressure contact with the disk, and the magnetic head is provided with an appropriate gap between the magnetic head and the disk. A lift bar that locks the arm so that it stops at a set position, a biasing means that biases the lift bar toward a position where the arm is locked, and a retracted position that allows the lift bar to be brought into pressure contact with the magnetic head against the disk. an action lever that moves against the biasing means until the lift bar is moved to the retracted position, an adsorption type solenoid that holds the action lever in the action position that positions the lift bar in the retracted position, and a pushing means that pushes the action lever toward the action position when the disk rotates. Characterized by being able to sing.

Function Since the present invention has the above configuration, when the power is turned off,
The holding of the operating lever by the suction type solenoid is released,
The operating lever is movable from its operating position, so that the lift bar is moved by the biasing means to the locking position, so that the arm is lifted so that a gap is formed between the magnetic head and the disk. In addition, when the power is turned on after the disk is inserted, the suction type solenoid is energized and the disk starts rotating, so that the operating lever is pushed out to the operating position by the pushing means and the suction solenoid is activated. The lift bar moves to the retracted position against the biasing force of the biasing means.
The arm swings toward the disk, and the magnetic head comes into pressure contact with the disk, allowing recording and playback.

Example An embodiment of the present invention will be described below with reference to FIG.

Reference numeral 1.2 denotes a magnetic head that performs recording and reproducing by press-contacting the upper and lower surfaces of a disk (not shown), and is placed on a carriage 3 that is movable in the radial direction of the disk so that it can access any track on the disk. It is composed of A magnetic head 2 that presses against the bottom surface of the disk is attached to the tip of a carriage 3, and a magnetic head 1 that presses the top surface of the disk is attached to the tip of an arm 4 that is attached to the carriage 3 so as to be able to swing vertically. There is. Arm 4
is biased downward by a biasing means (not shown), and the magnetic head 1 is pressed against the disk by the biasing force, and the disk is pressed between the magnetic heads 1 and 2.

Protrusions 5a and 5b are provided on both sides of the arm 4.

One protrusion 5a is provided so as to be engaged with an operating piece (not shown) that moves up and down in conjunction with the disk insertion/ejection operation, in order to swing the arm 4 upward significantly when inserting/ejecting the disk. The lift par 6 engages with the other protrusion 5b.

The lift par 6 extends long along the moving direction of the carriage 3, and one end of the lift par 6 is fixed to one end of an L-shaped swing link 7 whose intermediate portion is supported to be swingable around a horizontal axis 8. The lift par 6 is configured to move up and down as the swing link 7 swings. A spring 9 biases the L-shaped swing link 7 so that the lift par 6 moves upward, and the upper limit position of the lift par 6 is regulated by a stopper (not shown). Also, when the protrusion 5b of the arm 4 is locked to the lifter 6 at the upper limit position, the magnetic head l is positioned with an appropriate gap from the disk.
The upper limit position of lift par 6 is set.

Reference numeral 10 denotes an operating lever whose base end is swingably supported around a vertical shaft 11, and a retaining portion in the middle of which is engaged with the other end of the L-shaped swing link 7 biased by a spring 9. 12 are formed. At the tip of the operating lever 10, an engagement roller 13 is attached on one side in the biasing direction of the spring 9, and a suction piece 14 is attached on the other side on the opposite side.

The locking roller 13 can be locked to a cam protrusion 16 protruding from the outer periphery of a rotor 15 of a flat motor that rotationally drives the disk, and collides with the cam protrusion 16 as the rotor 15 rotates, and the reaction lever 10 is driven to swing in a direction opposite to the biasing direction by the spring 9.

In addition, since the suction piece 14 is suctioned by the suction type solenoid 17, the operating lever 10 is held at the operating position where it swings against the biasing force of the spring 9. When the operating lever 10 is in the operating position, the lifter 6 has been lowered to a retracted position that allows the magnetic head 1 to come into pressure contact with the disk.

Next, the operation will be explained.

First, in the operating state with the power turned on, the action lever lO
The suction piece 14 at the tip of the lever is suctioned by the suction type solenoid 17, and the L-shaped swing link 7 is swung by the engaging portion 12 of the operating lever 10 against the biasing force of the spring 9, and the lift part is rotated. 6 has been lowered to the retracted position. Therefore, arm 4
The magnetic head 1 is pressed against the disk by the urging force of
The disk is held between magnetic heads 1 and 2. In this state, the disk is rotationally driven by the motor, recording and reproduction are performed by the magnetic heads 1 and 2, and the carriage 3
By moving the , an arbitrary track on the disk can be accessed.

After that, when the power is turned off, the holding of the action lever 10 by the adsorption type solenoid 17 is released, and the action lever 10 is released.
becomes movable, so that the lifter 6 is moved to its upper limit position by the biasing force of the spring 9, the protrusion 5b is pushed up, and the arm 4 is lifted so that a gap is formed between the magnetic head 1 and the disk. Therefore, even if the power is turned off and the disk is left unremoved, the magnetic head 1.2 will not remain in pressure contact with the disk and be attracted to it.

Further, when taking out the disk, the arm 4 is opened wide upward by pushing up the protrusion 5a with an operating piece (not shown).

Next, when the disk is inserted, the operating piece (not shown) moves downward and the arm 4 swings downward, but at this time the protrusion 5b is locked to the lifter 6 and the arm 4 is stopped. The magnetic head 1 stops at a position with a gap between it and the disk. Therefore, even if the operating piece is not operated via a soft load mechanism equipped with an oil damper or the like, the magnetic head 1 will not impact the disk.

Next, when the power is turned on after inserting the disk, the adsorption solenoid 17 is energized and the rotor 15 starts rotating, causing the cam protrusion 16 to move against the engagement roller 13.
The action lever 10 is pushed out against the biasing force of the spring 9 due to the reaction, and the suction piece 14 engages the suction type solenoid 1.
7 and the operating lever 10 is held in its operating position.

Accordingly, the lifter 6 moves to the retracted position, the arm 4 swings toward the disk, the magnetic head 1 comes into pressure contact with the disk, and the recording/reproducing operation is performed as described above.

Effects of the Invention According to the disk drive device of the present invention, as is clear from the above description, when the power is turned off, the holding of the operating lever by the suction type solenoid is released, and the lift bar is locked by the biasing means. A gap is formed between the magnetic head and the disk by moving the magnetic head to this position, so even if the disk is not removed, the magnetic head will stick to the disk, causing trouble when re-driving or damaging the disk or magnetic head. There is no such thing as occurring. Furthermore, since a suction type solenoid is used, it can be made smaller and consumes less power. In addition, when inserting a disk, the lift bar stops the magnetic head at a position with a gap between the magnetic head and the disk, so the magnetic head does not come into contact with the disk due to impact, and it also functions as a soft load mechanism. It has great effects, such as being able to do things.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of essential parts of an embodiment of the present invention, and FIG. 2 is a schematic front view of a conventional example. ■, 2...Magnetic head, 4...Arm, 6...Lift par 9...Spring, 1
0... Acting lever 13... Engagement roller, 15... tel-event, 16... Cam protrusion, 17, Adsorption type solenoid. Agent: Patent attorney Shigeko Awano (1 person)

Claims (1)

[Claims] A lift bar that locks the arm so that the magnetic head stops at a position with an appropriate gap between the magnetic head and the disk, and the lift bar. an actuating lever that moves the lift bar against the urging means to a retracted position that allows the magnetic head to come into pressure contact with the disk, and a lever that moves the lift bar to the retracted position. 1. A disk drive device comprising: an adsorption solenoid that holds an operating lever at an operating position; and means for pushing the operating lever toward the operating position when the disk rotates.