JPH0799606B2 - Flotpie disk device control method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floppy disc device for protecting a disc from damage caused when the floppy disc is mounted.

[0002]

2. Description of the Related Art Conventionally, a storage device such as a magnetic tape or a magnetic disk has been widely used as an external storage device for a computer, but in recent years, it has been relatively small in size called a minicomputer or a microcomputer. As a simple external storage device for a computer, a storage device using a magnetic sheet disk, that is, a so-called Froppy disk has been widely used.

An example of such a floppy disk device is shown in FIG. This figure shows a mini-sized floppy disc device as an example. 1 is a floppy disc device housed in a protective jacket, 2 is a floppy disc device, and 3 is a portion where the floppy disc 1 is inserted. It is a door provided at the entrance of. When using this device, open the door 3 and then insert the floppy disc 1 into the device while still housed in the jacket, then open the door 3
When is closed, it is set to the operable state.

FIGS. 2 (a) and 2 (b) show an example of a disk driving method for such a floppy disk device. FIG. 2 (a) shows the floppy disk by opening the door 3 (FIG. 1). After the insertion of 1 and the door 3 is not yet closed,
(b) shows the state after which the door 3 is closed, and in these figures, 4 is a centering cone, and 5 is a centering cone.
Is the central hole of the floppy disc 1. In addition, 1'is a jacket of the floppy disc 1.

The centering cone 4 has a conical shape as its name implies, and the outer peripheral surface of the centering cone 4 fits in the center hole 5 of the disk 1 to rotate, which serves as a drive shaft for rotationally driving the disk 1. is there. Since the centering cone 4 moves in the axial direction in conjunction with opening and closing of the door 3, when the disc 1 is inserted and the door 3 is closed, the state shown in FIG. In the state of b), when the door 3 is opened, the state of FIG. 2 (b) automatically returns to the state of FIG. 2 (a).

Therefore, the centering cone 4 is fitted in or separated from the disk 1 only by opening / closing the door 3, and when the door 3 is closed, the disk 1 is moved as shown in FIG. 2 (b). This means that the rotary drive is automatically set.

Next, FIG. 3 shows a rotational driving state of the disk 1 by the centering cone 4, and 6 is a driving motor. Therefore, when writing information to or reading information from the floppy disc 1, the drive motor 6 rotationally drives the floppy disc 1 to write or read necessary information. .

By the way, since such a floppy disc 1 is rotationally driven while being housed in the jacket 1 ', it is necessary to house it in the jacket 1'with a relatively large margin. Floppy Disc 1
When the is inserted into the floppy disc device and set in place, the center of the floppy disc 1 and the center of the jacket 1'may become misaligned as shown in FIG. 4 (a). Often occurs.

In this state, if the door 3 is closed and the centering cone 4 is to be fitted in the center hole 5 of the disk 1, the end portion of the centering cone 4 will be the disk 1 as shown in FIG. 4 (b). The centering cone 4 fits into the central hole 5 of the disk 1 while riding on the top of the disk and bending and deforming the portion. Therefore, a wavy deformation is applied to the inner peripheral portion of the central hole 5 of the floppy disk 1. Or
There is a risk that the center hole 5 will be deformed into an elliptical shape.

At this time, if the centering cone 4 is rotating, the end portion of the cone 4 is at the end of the floppy disk 1.
When the disk 1 is brought into contact with the periphery of the central hole 5, the disk 1 moves so that the center of the central hole 5 and the center of the cone 4 coincide with each other, that is, a so-called self-centering function works. The risk of deforming the vicinity of the central hole 5 of the disk 1 does not occur.

However, as described above, a storage device using a floppy disk, particularly a mini-sized floppy disk, is mainly used for a small and simple computer, so that it is small and low in cost. Therefore, a direct current motor is mainly used as the driving motor 6 accordingly. As a result, in such a floppy disc device, a start / stop control circuit for the drive motor is provided in the floppy disc device as shown in FIG. 5 in consideration of the life of the drive motor, and a strobe signal from a computer or the like is provided. Thus, the control circuit is operated to drive the floppy disk only when writing / reading information, and the drive motor is stopped at other times.

In FIG. 5, 6 is a motor for rotating the drive cone 4 already described, 7 is a start / stop control circuit, 8 is a holding circuit, and 9 is a motor drive circuit. The start / stop control circuit 7 generates a start signal in response to a command from a computer or the like when writing / reading information and supplies it to the holding circuit 8. The signal held in the holding circuit 8 is supplied to the motor drive circuit 9, and the motor 6 rotates to drive the Froppy disk 1 to rotate via the drive cone 4. Also, when writing and reading of information is completed,
Since the control circuit 7 supplies the stop signal to the holding circuit 8, the output of the holding circuit 8 disappears and the motor 6 stops.

Therefore, in this conventional floppy disc device, since the centering cone does not rotate when the floppy disc is inserted, the floppy disc is easily deformed and damaged as described above. As a result, there are drawbacks such as the handling is inconvenient due to the skill required for inserting the floppy disc and the life of the floppy disc is shortened so that valuable information is easily lost.

Therefore, in order to eliminate the drawbacks of this prior art, the operation of inserting the floppy disk is detected to control the rotation of the motor for driving the floppy disk, and the motor for driving is automatically rotated at the time of inserting the floppy disk. Floppy disk device that has been proposed has been proposed,
This device will be described below with reference to FIG. 6. In the figure, 10 is an open / close detection circuit for the door 3 (FIG. 1), and 11 is an OR circuit. The motor start / stop circuit 7, the holding circuit 8, the motor drive circuit 9 and the like are the same as in the conventional example of FIG.

The door opening / closing detection circuit 10 generates a pulse signal (b) when the door 3 is opened and then started to be closed, and gives a start signal to the holding circuit 8 via the OR circuit 11. Accordingly, since the output from the holding circuit 8 is supplied to the motor drive circuit 9, the drive motor 6 rotates and drives the centering cone 4 to rotate.

Therefore, as shown in FIG. 1, when the door 3 is opened to insert the floppy disk 1 and then the door 3 is closed, the drive cone 4 (FIGS. 2 to 4) immediately starts rotating. Therefore, for example, even if the center of the center hole 5 of the floppy disc 1 and the center of the centering cone 4 are slightly deviated from each other as shown in FIG. 4 (a), this deviation is corrected by the self-centering action already described. As shown in FIG. 3, it is possible to prevent the damage and the like from occurring in the vicinity of the central hole 5 of the floppy disk 1 by being fitted properly.

Next, this apparatus will be described in more detail with reference to FIGS. 7 and 8. In FIG. 7, 12 is the door 3
A switch that turns OFF when opens and turns ON when starts closing, 13 is a monostable multivibrator (monomulti),
14 is an OR gate, 15 is a flip-flop (FF), 1
6 is a power transistor.

Next, the operation will be described with reference to the time chart of FIG. As shown in FIG. 1, when the door 3 of the floppy disc device 1 is opened, the switch 12 is turned off.

On the other hand, at this time, as a matter of course, no information is written or read, so that the output (c) of the start / stop control circuit 7 remains at the low level. Next, when the floppy disk 1 is inserted and then the door 3 is closed, the switch 12 is turned on, so that the output (a) becomes low level. The trailing edge of the output (a) triggers the mono-multi 13 and its output (b) becomes high level. Therefore, this output (b) passes through the OR gate 14 and becomes the output (d), which sets the FF 15. As a result, the output (e) becomes high level, the transistor 16 becomes conductive, and the drive motor 6 starts rotating.

Therefore, the inserted floppy disc 1
On the other hand, when the centering cone 4 is trying to be fitted, the centering cone 4 is always rotating, and when the inserted flotupy disc 1 is in the state shown in FIG. Even in the state of (a), the self-centering action is effective and the mating is always performed in the correct state as shown in FIG. 2 (b). Also, the floppy disk 1 will not be damaged.

After inserting the floppy disc 1, the signal (c) from the control circuit 7 is sent to the FF 15 via the OR gate 14 to control the start / stop of the motor 6.

[0022]

However, as shown in FIG.
In the device described in FIG. 8, no consideration is given to the control of the motor for driving the floppy disk drive when the power of the floppy disk device is turned on, and the power source of the floppy disk device is maintained with the floppy disk inserted. When it is turned on, the Frotpies disk drive motor immediately starts to rotate by itself, which causes a problem that the life of the Flotpies disk is shortened.

That is, in the floppy disc device, the information writing / reading head is always in contact with the information recording surface of the floppy disc, so that the floppy disc drive motor rotates with the floppy disc inserted. After the start, the information writing / reading head of the Flotpies disk device remains in contact with the information recording surface of the Flotpies disk until a specific control of writing / reading is given from the computer. Since the head continues to rotate while being positioned on the track, the sliding time of the head on the same track becomes long, the probability of damage to the recording medium increases, and the life becomes short.

It is an object of the present invention to provide a method of controlling a floppy disk device, in which damage to the floppy disk is sufficiently suppressed and which has a long life and high reliability.

[0025]

SUMMARY OF THE INVENTION The above-described object is to, when the power of the floppy disk drive is turned on in response to the turning on of the computer, supply the electric power to the motor for driving the floppy disk and then drive the disk of the floppy disk. A reset signal for inhibiting the rotation of the motor is supplied from the computer to the floppy disk device.

[0026]

The reset signal works so that the Frotpies disk drive motor does not start rotating only by turning on the power to the Flotpies disk device. Therefore, the information writing / reading head of the floppy disk device does not continue to rotate while being positioned on the same track, and the life of the floppy disk can be sufficiently extended.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A control method for a floppy disk device according to the present invention will be described in detail below with reference to the illustrated embodiments. 9 and 10 show an embodiment of the present invention. FIG. 9 is a block diagram showing the entire structure, and FIG. 10 is a specific circuit diagram of a part thereof. In FIGS. Reset-prioritized RS flip-flop with clear input (RSF
F), 21 are centering completion detection circuits, and 22 is an exclusive OR circuit (EXOR). The floppy disk 1, the centering cone 4, the center hole 5, the drive motor 6, the motor drive circuit 8, the open / close detection switch 12 for the door 3 and the like are the same as those in FIGS. 6 and 7.

The RSFF 20 is cleared by the clear (reset) signal (h) provided from the computer when the Froppy disk device is powered up to be in an operable state, and then the signal (a) from the switch 12 is supplied. ), And is preferentially reset by the signal (g) from the EXOR 22, its operation is as shown in the logic table of FIG. In FIG. 11, H indicates a high level signal, L indicates a low level signal, and X indicates that the input state is H but is not related to it. And N
o. Q in 5 indicates that the previous state is preserved as it is.

The centering completion detecting circuit 21 mainly comprises a switch which operates when the centering cone 4 is fitted into the center hole 5 of the floppy disc 1 and reaches a predetermined position, and the centering cone 4 is moved to a predetermined position. The power supply voltage, that is, H is maintained while the voltage does not reach, and when the centering is completed and a predetermined position is reached, a contact voltage, that is, a signal (f) that becomes L is generated.

Next, the operation will be described with reference to the time chart of FIG. First, when the power of the floppy disk device is turned on, a signal (h) which is at a low level for a certain period as shown in FIG. 12 (h) is supplied to the clear terminal CLR of the reset priority RSFF 20 by a power reset circuit (not shown). No. of FIG. As shown in FIG. 1, the output signal Q of the FF 20 becomes low level as shown in FIG. 12 (e), and this is given to the motor drive circuit 8 as the signal (e), and the motor 6 is set to the stopped state. At this time, since the signals (a) and (g) applied to the input terminals S and R of the RSFF 20 are both at the high level, FIG. As shown in FIG. 5, the output signal (e) of the RSFF 20 is maintained at the low level thereafter, so that the motor 6 is also maintained in the stationary state.

Next, when the floppy disk 1 is inserted into the floppy disk device 2 and the door 3 is closed, the door switch 12 works to operate the RSFF 20 as shown in FIG. 12 (a).
The set input signal (a) of falls to low level. At this time, the output Q of the RSFF 20 is No. 1 in FIG. 2 becomes high level as shown in FIG. 12 (e), and this signal (e) is supplied to the motor drive circuit 8, so that the motor 6
Starts to rotate, and the centering cone 4 also starts to rotate.
On the other hand, as the door 3 is closed, the centering cone 4 moves into the hole 5 of the floppy disk as described with reference to FIG.
And the center of the center of the rotation shaft of the Frotpies disk device, that is, the centering cone 4 and the center of the Frotpies disk 1 are aligned. In the case of the present embodiment,
As the centering cone 4 rotates, it advances toward the hole 5 of the Flotpies disk, so as shown in FIG.
Even when the hole 5 is placed at a position displaced from the centering cone 4, the centering action can be performed without scratching the Froppy disc sheet.

Because the centering cone 4 is rotating, when it contacts the floppy disk 1,
This is because the disk is immediately started to rotate, and as described above, a so-called self-centering effect can be obtained in which the center of the center hole 5 and the rotation axis of the centering cone 4 are aligned with each other by the action of centrifugal force or the like.

In this way, the centering cone 4 inserted into the hole 5 of the floppy disc 1 moves the switch of the centering completion detecting circuit 21 from the position shown by the solid line in FIG. 10 to the position shown by the broken line. As a result of such movement, since the switch is grounded, the upper input terminal of the exclusive OR circuit 22 is dropped from the high level to the low level as shown in FIG. 12 (f). The lower input terminal of the exclusive OR circuit 22 is set to the low level only when the Flotpie disk device is externally accessed by the signal (c), but when it is not accessed, that is, at the high level at this time. Therefore, the output (g) of the exclusive OR circuit 22 falls to the low level as shown in FIG.

On the other hand, at this time, the input of the RSFF 20 is
No. 1 in FIG. Since the state shown in FIG. 4 is reached, the output (e) of the FF 20 drops to the low level, so that the input signal to the motor drive circuit 8 drops to the low level as shown in FIG. Stopped. Therefore, it can be seen that by closing the door 3 of the floppy disc device, the motor 6 that has started to rotate can be automatically stopped after completing the centering action of the inserted floppy disc 1. .

Thereafter, after the above-described operation is completed, the R3 is opened unless the door 3 of the floppy disk device is opened.
Since the set input S of the SFF 20 is maintained at a low level, the No. 1 in FIG. 2, No. As shown in FIG. 4, when the reset input R of the FF becomes high level, the output Q also becomes high level and the motor 6 rotates, and when the reset input R becomes low level, the output of the FF is output. Since Q also becomes low level, the motor 6 stops. Then, the output of the centering completion detection circuit 21 is maintained at the low level.

Therefore, when the access signal (c) of the Flotpy disk device is dropped to the low level, the output of the exclusive OR circuit 22 becomes the high level and the motor 6 is rotated,
On the contrary, if the signal (c) is raised to a high level, the output of the circuit 22 goes to a low level and the motor 6 can be stopped, and the motor 6 is rotated only when the floppy disk device is accessed as usual. be able to.

Therefore, according to this embodiment, even if the power is turned on while the floppy disk is still inserted in the device, the floppy disk will be turned on until a predetermined access is made from the computer side. Since it is possible to reliably inhibit the rotation of the recording medium, it is possible to reliably prevent unnecessary wear of the recording medium of the floppy disc, and it is possible to sufficiently extend the life of the floppy disc.

Further, in the above embodiment, the centering cone automatically rotates when the floppy disc is inserted to operate the centering function, and after the centering is completed, the drive motor is stopped for the first time to always obtain a reliable centering. Since the present invention is applied to the Floppy disk device configured as described above, the rotation of the Floppy disk can be sufficiently limited only at the time of centering and the writing and reading of information by the access of the computer. Unnecessary wear of the medium can be reliably suppressed, the rotation time of the drive motor can be reliably suppressed only during the necessary period, and the risk of damage when the disk is inserted can be eliminated. The life of the floppy disk and the drive motor can be sufficiently extended.

In each of the above embodiments, the Frotpie disk device in which the centering cone 4 drives the Froppy disk 1 is used. The present invention is shown in FIG. As shown, a drive cup 25 that is rotationally driven by a drive motor is used, and the floppy disc 1 is rotationally driven by sandwiching the floppy disc 1 by the cup 25 and the centering cone 4. It goes without saying that the same can be applied to the device.

[0040]

As described above, according to the present invention,
Even if the power is turned on while the floppy disk is still inserted in the device, the rotation of the floppy disk can be reliably prohibited until a predetermined access is made from the computer side. It is possible to reliably prevent unnecessary wear of the recording medium of the floppy disk.
The life of the floppy disc can be sufficiently extended and the excellent effects listed below can be obtained.

Since it is possible to eliminate the wasteful rotation of the disk drive motor, it is possible to surely save power and to prolong the usable time of the power source such as the battery. In the floppy disk device, the information writing / reading head is always in contact with the information recording surface of the disk when the disk is inserted. Therefore, if the disk is left inserted, the head and the information recording surface of the disk are stuck. If the Flotpies disk starts to rotate in this state, the information recording surface of the disk will be destroyed. However, in the present invention, since the Flotpies disk does not start rotating only by turning on the power of the Flotpies disk device, the Frotpies disk is removed from the Flotpies disk by the time the power is turned on and before the rotation is started. You can give the opportunity to pull it out, and the probability of damaging the floppy disc is reduced accordingly.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a floppy disk device.

FIG. 2 is an explanatory diagram showing a relationship between a centering cone and a floppy disc and a centering operation in a normal state in the floppy disc device.

FIG. 3 is an explanatory diagram showing an example of a centering cone drive system in a floppy disk device.

FIG. 4 is an explanatory diagram showing a problem of centering operation in the floppy disc device.

FIG. 5 is a block diagram of a control circuit in a conventional example of a floppy disk device.

FIG. 6 is a block diagram showing an example of a floppy disk device in which a drive motor is rotated when a floppy disk is inserted.

FIG. 7 is a circuit diagram showing an example of a floppy disk device in which a drive motor is rotated when a floppy disk is inserted.

FIG. 8 is a time chart for explaining the operation of an example of a floppy disk device in which the drive motor is rotated when the floppy disk is inserted.

FIG. 9 is a block diagram showing an embodiment of a control method of the floppy disk device according to the present invention.

FIG. 10 is a circuit diagram showing an embodiment of a control method of the Flotpies disk device according to the present invention.

FIG. 11 is a logic diagram for explaining the operation in the embodiment of the present invention.

FIG. 12 is a time chart for explaining the operation in the embodiment of the present invention.

FIG. 13 is an explanatory diagram showing an example of a drive mechanism of a floppy disk device.

[Explanation of symbols]

 1 Floppy disk 2 Floppy disk device 3 Door 4 Centering cone 6 Drive motor 7 Motor start / stop control circuit 8 Holding circuit 9 Motor drive circuit 10 Door open / close detection circuit 11 Logical sum circuit 12 Door open / close detection switch 20 Reset with reset input Priority RS flip-flop 21 Centering completion detection circuit 22 Exclusive OR circuit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigeru Komatsu 292 Yoshida-cho, Totsuka-ku, Yokohama City, Kanagawa Prefecture Home Appliances Research Laboratory, Hitachi, Ltd. (72) Inventor Mikiaki Kobayashi 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Stock company Hitachi Electric Appliances Research Laboratory (56) References JP-A-56-117371 (JP, A) JP-A-58-108061 (JP, A)

Claims (1)

[Claims] 1. A flow Tsupi flow Tsupi disk apparatus of a type for controlling the rotation by the information writing reading command the disk drive motor from the computer, the Furotsu
After the power of the pee disk device is turned on and the power for the floppy disk drive motor is supplied, the rotation signal of the floppy disk drive motor is prohibited by a reset signal generated by the computer. A method for controlling a floppy disk device, which is characterized.