JPH11296948A - Magnetic disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic disk device capable of preventing the damage of recorded data due to the eject operation at the time of reading/writing operation. SOLUTION: The device is provided with a 1st detecting means 23 for detecting the presence of the movement of a cam plate 5 pushing up a disk holder from the lower position capable of reading/ writing the disk to the upper position capable of inserting/ejecting the disk when moved by a prescribed distance from the front side of a chassis to the rear side of the chassis and also descending the disk holder to the position capable of reading/writing the disk from the position capable of inserting/ejecting the disk when moved oppositely thereto, a 2nd detecting means 25 for detecting the moving position of the disk holder in accordance with the moving position of the cam plate 5, and a controller 26 for permitting the reading/writing operation of a read/write device 12 only when the cam plate is stopped and also the disk holder is positioned at the position capable of reading/writing the disk in the result of the detection by the 1st and 2nd detecting means 23, 25, thereby the device is contrived to cope with the damage of preserved data caused by the unexpected operation of the cam plate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk drive for reading and writing data from and to a magnetic disk, and more particularly to a magnetic disk drive for preventing recorded data from being damaged when a disk is inserted or ejected.

[0002]

2. Description of the Related Art Generally, this type of magnetic disk device is
A disk holder for holding a magnetic disk is built in a box-shaped chassis, a magnetic disk is inserted into a disk insertion opening of the disk holder, and a predetermined depth is pushed in.
A disk feed mechanism incorporated in the chassis lowers and holds the disk holder to a disk readable / writable position lower than the disk insertion / ejection possible position,
At this read / write position, reading / writing by the reading / writing device is executed.

A push button is provided around the disk insertion opening on the front surface of the chassis to reverse the operation of the disk feed mechanism to move the disk holder to a position where the disk can be inserted. The disk holder is pushed up from the disk readable / writable position to the disk insertable position and held.

FIG. 3 shows a conventional magnetic disk drive of this type. As shown in FIG.
A disk holder 4 for holding the magnetic disk 3 is vertically movably engaged with both side surfaces of the chassis 2, and between the lower surface of the disk holder 4 and the inner bottom surface 2 a of the chassis 2 facing the disk holder 4 in the disk insertion direction. A cam plate 5 is provided so as to be able to move forward and backward along the cam plate 5, and a flange 6 and a cam groove 7 provided on the cam plate 5 raise and lower a support shaft portion 8 projecting outward from both left and right sides of the disk holder 4. Thus, the disk holder 4 is moved to one of the lower disk readable / writable position and the upper disk insert / eject position.

The height of the flange 6 is set so that the disk holder 4 is located at a position where the disk can be inserted and ejected when the support shaft 8 is supported on the upper end surface thereof. It extends diagonally downward toward the rear side of the chassis 2 and opens at the upper end surface of the flange 6 of the disk holder 4.

Therefore, the chassis 2 is provided at the open end of the cam groove 7.
The positions of the support shaft 8 and the cam groove 7 are set mutually so that the support shaft 8 is engaged from the front side and can move up and down along the cam groove 7. When the lift of the cam groove 7 is set correspondingly, the disk holder 4 can be switched from the position where the disk can be inserted and ejected to the position where the disk can be read and written, and vice versa, in accordance with the movement of the cam plate 5.

Further, in this type of disk device 1, the disk holder 4 and the cam plate 5 are connected by a return spring 11 that pulls the cam plate 5 toward the front of the chassis 2 when the locking arm is released. An unlocking arm is provided which operates the locking arm to the unlocking position when the magnetic disk 3 is rotated by the pressing force of the front end surface of the magnetic disk 3 when the magnetic disk 3 is inserted.

[0008]

According to the conventional magnetic disk drive 1, the magnetic disk 3 is mounted on the disk holder 4.
The magnetic disk 3 can be set at the disk read / write position only by inserting the magnetic disk 3 to a predetermined depth, and the disk holder 4 can be set simply by pressing the push button 13 integrally attached to the front side of the chassis 2 of the cam plate 5. Can be set to the position where the disk can be inserted and ejected. However, the urging force of the return spring 11 is set to be strong in order to prevent ejection of the disk due to easy pushing or accidental pushing and to prevent damage to the recorded data on the magnetic disk 3. Therefore, there is a problem that the operability is low.

Therefore, the present applicants have considered a magnetic disk ejecting apparatus using a dedicated motor, eliminating the manual operation using the eject button. FIG. 4 is a conceptual diagram showing the disc ejecting device, and shows a rear portion of the cam plate 5,
That is, an operating arm 13 that extends toward the rear of the chassis 2 at the end opposite to the disk insertion port and then bends in an L-shape toward the inside of the chassis 2 is formed on the flange of the final reduction gear 20 of the disk discharge motor (not shown). The return spring 1
By providing a projecting piece 21 for pulling the cam plate 5 toward the rear side of the chassis 2 against the urging force of 1 and by inputting a disk discharge signal to a drive circuit of a disk discharge motor via a switch or a computer (not shown). The automatic ejection of the magnetic disk 3 is realized by a structure in which the cam plate 5 is drawn toward the rear side of the chassis 2 by a stroke from the axis of the final reduction gear 20 to the projecting piece 21. In FIG. 4, reference numeral 9 denotes an unlocking arm.
0 indicates a locking arm.

In the conventional magnetic disk device, the motor drive of the cam plate at the time of ejection is performed by a disk ejection signal, but the stop is performed by a detection switch. In this case, regardless of whether the disc is in the read / write position or the insertion / ejection position, the detection switch is in the ON state. Therefore, when the power is turned off and then turned on again, the ejection operation is always performed and the cam plate is driven. There is a problem that the motor has to be initialized and extra operation is required. Further, in the conventional magnetic disk device, when the disk holder is moved downward by the spring force, the magnetic head is hit against the disk surface, and there is a possibility that recorded data may be damaged. In order to prevent this, it was necessary to provide a damper member in the drive mechanism of the disk holder in order to lower the magnetic head slowly on the disk surface.

It is therefore an object of the present invention to prevent the above-described cam plate drive motor from being initialized and to prevent damage to recorded data when a magnetic disk is inserted or ejected without using a damper member. The purpose of.

[0012]

SUMMARY OF THE INVENTION The present invention has been proposed to achieve the above-mentioned object, and a disk holder for holding a magnetic disk is engaged with an inner surface of a chassis in a vertically movable manner. The disk holder can be inserted and ejected above a lower disk readable / writable position when the disk holder is moved a predetermined distance from the front side of the chassis to the rear side of the chassis between the lower surface and the inner bottom surface of the chassis facing the lower surface. And a cam plate for lowering and holding the disc holder from the disc insertion / ejection possible position to the disc readable / writable position when the disc holder is moved in the opposite direction, and movably interposed between the cam plate and the cam plate. A read / write device for reading / writing to / from the magnetic disk is disposed on the rear side of the chassis, and the read / write device is mounted on the cam plate by a driving force of a motor. In a magnetic disk drive provided with a cam plate moving means that selectively moves to one of a rear portion of the chassis and a front portion of the chassis, a first detecting device for detecting whether the cam plate has moved, Second detection means for detecting the movement position of the disk holder based on the movement position; and the detection results of the first and second detection means, the cam plate is stopped and the disk holder is at a disk readable / writable position. A magnetic disk drive provided with a controller that permits reading and writing of the read / write device only when the magnetic disk drive is located at a position where the cam plate moving means locks the cam plate at the position where the disk can be inserted and ejected. When releasing the locking of the stop arm, the cam plate is released while sequentially releasing the urging force of the elastic means connecting the cam plate and the disc holder. A first rotating operation for sending the disk holder to the front side of the chassis to position the disk holder at a disk readable / writable position, and pulling the cam plate toward the rear side of the chassis against the biasing force of the resilient means. A rotation arm for performing a second rotation operation of positioning the disk holder at the disk insertion / ejection possible position in one cycle of rotation, and a motor for operating the rotation arm;
The controller inputs a control signal for causing the motor to perform a first rotation operation after the first detection unit detects the movement of the cam plate until the second detection unit detects a disk readable / writable position. Thereafter, when a disk ejection signal is input, the present invention provides a magnetic disk drive configured to input a control signal for causing the motor to perform a second rotation operation.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A magnetic disk drive according to an embodiment of the present invention will be described below in detail with reference to FIGS.
It is to be noted that the same reference numerals are used for the portions which are the same as those described in the related art, and the description is omitted.

In FIG. 1, reference numeral 5 denotes a cam plate, and a cam plate moving means 14 for selectively moving the cam plate 5 to one of a rear portion of the chassis 2 and a front portion of the chassis 2 is provided at a rear portion of the chassis. It is arranged. When the locking arm 9 is released by the pushing force of the magnetic disk 3, the cam plate moving means 14 sequentially releases the urging force of the return spring 11 connecting the disk holder 4 and the cam plate 5. The first rotating operation of sending the L-shaped operating arm 13 at the rear of the cam plate 5 toward the front of the chassis 2 to position the disk holder 4 at the disk readable / writable position, and resisting the urging force of the return spring 11 And a second rotation operation for sending the cam plate 5 to the rear side of the chassis 2 in one cycle of rotation, and a cam plate drive for driving the rotation arm 17 via a gear reducer 18 The rotation arm 17 includes a final reduction gear 20 of the gear reducer 18 and a gear franc of the final reduction gear 20. And more projects outward the chassis 2 front end face of the actuating arm 13 and a contacting protrusion 21.. Of course, in this case, the drawing stroke of the rotating arm 17 determined by the radius from the axis of the final reduction gear 20 to the contact surface of the projecting piece 21 with the operating arm 13 is caused by the first rotating operation, 5 is set so that it can be moved from the rear side of the chassis 2 to the front side of the chassis, that is, the position of the disk holder 4 can be moved from a position corresponding to the disk insertion / ejection position to a position corresponding to the disk read / write position. The feeding stroke of the rotary arm 17 is set so that the position of the disk holder 4 can be moved from the position corresponding to the disk readable / writable position to the position corresponding to the disk insertion / ejection position by the second rotation operation. The chassis 2 is brought into contact with a detected portion 22 extending outside the cam plate 5 to
A first detection switch (first detection means) 23 is provided so as to be able to detect that the cam plate 5 has moved from the position where the disc can be inserted and ejected by being switched from the FF to the ON state. A boss 24 as a detected object protruding from a gear flange of the final reduction gear 20
(See FIG. 2), a second detection switch is provided so as to contact the boss 24 and switch from OFF to ON when rotated to a rotation position corresponding to a disk readable / writable position facing radially outward. 25 are provided. Therefore, when the first detection switch 23 is turned on, the time when the unlocking arm 10 is unlocked is detected, and the amount of movement of the cam plate 5 is detected by the second detection switch 25. When the second detection switch 25 is switched from OFF to ON, it is detected that the disk holder 4 is located at the disk readable / writable position (in this case, the first and second detection switches 23 and 25 are used). It is also possible to use an optical or magnetic non-contact type sensor or a photodiode instead of, but a large number is required to widen the detection range. A microswitch with a wide area contact is preferred).

On the other hand, the controller 26 for controlling the driving motor 19 determines that the cam plate 5 stops and the moving position of the cam plate 5 based on the detection results of the first detection switch 23 and the second detection switch 25. Is configured to input a stop signal to the cam plate drive motor 19 and output a permission signal for permitting read / write to the read / write device 12 when the disk corresponds to the disk readable / writable position of the disk holder 4. 2 When a disc ejection signal is input from the eject switch 27 attached to the front surface or a computer, until an OFF signal is input from both the first detection switch 23 and the second detection switch 25, that is, the cam plate 5 Movement position can be inserted from the disk read / write position Until the detected that is switched to outputs a drive signal to the cam plate driving motor 19, and is configured to continue its rotation.

Next, with reference to FIG. 2, a description will be given of a one-cycle rotation operation of the rotating arm 17 from the position corresponding to the position where the disk can be inserted and ejected to the position where the disk can be ejected, and the control relationship with the controller. . In FIG. 2, the turning direction of the turning arm 17 is counterclockwise. FIG. 2 (A)
As shown in FIG. 5, the position near 0 ° is the home position of the rotating arm 17 whose rotation is restricted by the locking of the locking arm 9, that is, the position where the disc can be inserted and ejected, and The rotation position of about 90 ° corresponds to the disk readable / writable position. Therefore, at this position, the controller 26 receives the OFF signals from the first detection switch 23 and the second detection switch 25, respectively. When the magnetic disk 3 is inserted into the disk holder 4 at the home position, the locking arm 9 is rotated by the locking release arm 10 by the pushing force of the front end surface of the magnetic disk 3. When the locking of the locking arm 9 with respect to the cam plate 5 is released, the first detection switch 23 is switched from OFF to ON as shown in FIG. An ON signal is input from 23. The controller 26 knows that the magnetic disk 3 has been inserted by the ON signal of the first detection switch 23 and rotates the cam plate drive motor 19. Due to this rotation, the cam plate 5 draws in the disk holder 4 while soft landing to the front side of the chassis 2 by the elastic force of the return spring 11 connecting the disk holder 4 and the cam plate 5.

As shown in FIG. 2C, when the boss 24 of the final reduction gear 20 comes into contact with the second detection switch 25 and switches from OFF to ON, the controller 26
Knowing that the amount of movement of the cam plate 5 toward the front of the chassis 2 corresponds to the disk readable / writable position of the disk holder 4, a stop signal is input to the cam plate drive motor 19, and at the same time, the read / write device 12 Input a signal that permits reading and writing. Only in this case is the controller 26 outputting a read / write permission signal to the read / write device 12.

Thereafter, the controller 26 controls the cam plate drive motor 1 until a disc ejection signal is input by the eject switch 27 or a computer.
9 is continuously input.

Thereafter, when a disk ejection signal is input, a drive signal is input to the cam plate drive motor 19 again to resume counterclockwise rotation. By this rotation, as shown in FIG. 2D, the second detection switch 25 switches from ON to OFF. In this case, it can be detected whether the cam plate 5 is operating normally.

Further, as shown in FIG. 2E, when both the first detection switch 23 and the second detection switch 25 input an OFF signal to the controller 26, the controller 26 moves the cam plate 5 to the disk position. Judge that it corresponds to the position where the disc can be inserted and ejected from the holder 4,
As shown in FIG. 2A, the drive motor is rotated for a certain period of time, and a stop signal is input to the cam plate drive motor 19.

Of course, the controller 26 is configured to prohibit the driving of the cam plate drive motor 19 until the reading / writing is completed, even if the disk ejection signal by the eject switch 27 is interrupted during the continuation of the reading / writing. It is also possible to prevent accidental data corruption.

In the above description of the embodiment, the first detection switch 2 determines whether or not the cam plate 5 has moved.
3, the first detection switch 23 is disposed on the side or below or above the disk holder 4 or the magnetic disk 3 held by the disk holder 4. It is also possible to detect the presence or absence of the movement of No. 5. Further, in the present embodiment, the mechanism for engaging and disengaging the cam plate 5 by the locking portion 9 and the unlocking arm 10 has been described. However, such a locking mechanism is a conventionally known mechanism. The configuration is not limited to the configuration described in the embodiment. Further, the rotating arm 17 is basically
It is sufficient that the projecting piece 21 is provided at the tip of the arm that is rotated by the motor. In particular, the present invention is not limited to the form described in detail in the above embodiment. An outer ring rotatable around the axis of the protruding piece 21 can be attached to the outer peripheral surface of the protruding piece 21.

Furthermore, the present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified ones.

[0024]

As described above, the present invention is constructed so as to realize the auto-eject and the auto-insert as described in detail in the above embodiment, so that the disc can be easily inserted and ejected. The cam plate is stopped so that the movement of the cam plate and the position where the disk can be inserted / ejected and the position where the disk can be read / written can be determined by the first detecting means and the second detecting means, and the disk holder stops moving. Since the reading / writing of the reading / writing device is permitted only when the reading / writing device is located at the readable / writable position, it is possible to prevent the stored data from being damaged due to the accidental operation of the cam plate. It is an invention that exerts

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an embodiment of the present invention and showing a configuration of a main part of a magnetic disk drive.

FIG. 2 is a schematic view showing an embodiment of the present invention and showing an operation state of a main part of the magnetic disk drive.

FIG. 3 is a partially cutaway side view showing a conventional magnetic disk drive.

FIG. 4 is a conceptual diagram of a magnetic disk drive having an automatic disk ejection mechanism on which the present invention is based.

[Explanation of symbols]

 2 Chassis 3 Magnetic Disk 4 Disk Holder 9 Lock Arm 10 Lock Release Arm 11 Return Spring 12 Read / Write Device 14 Cam Plate Moving Means 17 Rotating Arm 19 Cam Plate Drive Motor 21 Projection 23 First Detection Switch (First Detection Means) ) 25 second detection switch (second detection means) 26 controller

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Tsuneo Uebo 1601 Sakai, Atsugi-shi, Kanagawa Pref.

Claims (2)

[Claims] 1. A disk holder for holding a magnetic disk is engaged with an inner surface of a chassis so as to be able to move up and down, and a lower surface of the disk holder and a lower surface of the chassis facing the disk holder are provided.
When the disk holder is moved from the front side of the chassis to the rear side of the chassis by a predetermined distance, the disk holder is pushed up and held at a disk insertion / ejection position above a lower disk readable / writable position, and is moved in reverse. A read / write device for reading / writing to / from the magnetic disk is provided at a rear portion of the chassis, with a cam plate for holding the disk holder lowered from the disk insertion / ejection possible position to the disk readable / writable position and movable back and forth. A cam plate moving means for selectively moving the cam plate to one of the rear portion of the chassis and the front portion of the chassis by a driving force of a motor; First detection means for detecting the presence / absence, and movement of the disk holder based on a movement position of the cam plate Second detection means for detecting the position, the detection results of the first and the second detection means, the cam plate is stopped, and only when the disk holder is located at a disk readable and writable position of the read / write device A magnetic disk drive comprising: a controller that permits reading and writing. 2. The apparatus according to claim 1, wherein said cam plate moving means is provided with a resilient means for connecting said cam plate and said disk holder when a locking arm for locking said cam plate at said disk insertable / ejectable position is released. A first rotating operation for sending the cam plate to the front side of the chassis while sequentially releasing the force to position the disk holder at a disk readable / writable position, and displacing the cam plate against the urging force of the resilient means; A rotating arm for performing a second rotation operation of pulling the disk holder to a position where a disk can be inserted and ejected by pulling the disk holder to the rear side in one cycle, and a motor for operating the rotating arm; However, the motor is used from when the first detecting means detects the movement of the cam plate to when the second detecting means detects a disk readable / writable position. And a control signal for causing the motor to perform a second rotation operation when a disc ejection signal is input. 2. The magnetic disk drive according to claim 1, wherein: