JPS6182381A - Magnetic recorder - Google Patents

Abstract

PURPOSE:To stop securely a magnetic head on a recording medium by a CPU and to secure the control by a computer by informing a host computer of an abnormal moving of the magnetic head at the time of the runaway of a program. CONSTITUTION:When a magnetic head 3 moves further inside from the inner- most track position, an interrupter member 7 rotates counterclockwise due to the rotation of a pulley 5, and the optical path of a moving position limit sensor 9 is cut off. Thus a monostable multivibrator 21 is triggered owing to the fall that the output of an arithmetic amplifier 19 inverts from a high level to low one, and its output Q' resets a CPU11. Then the action of a stepping motor 16 is stopped, and further the shifting to the interior of the head 3 is stopped. When the output Q' is stopped, a monostable multivibrator 22 is triggered, and an offering signal is given to the CPU11. The interruption processing can check that the head 3 is positioned in the inner-most periphery, and the head 3 is shifted outside, whereby it can be prevented from colliding with a keep plate 2 of a disk 1. The CPU11 reports the abnormality of a program to a host computer.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a magnetic recording device.

[Prior Art] Conventionally, in a magnetic recording device, a magnetic head is controlled to move back and forth in the radial direction on a magnetic disk, which is a storage medium, to position the magnetic head at a corresponding track position and write or read information. I try to do it.

In this case, a zero track position is provided at a predetermined position on the outer periphery of the magnetic disk, and when the magnetic head reaches the zero track position, it is rotated by the rotation of a stepping motor that controls the movement of the magnetic head using, for example, an optical zero track sensor. The operated interrupter member is detected and outputted to the central processing unit (CP[J), which stops the operation of the stepping motor and determines the home position of the magnetic head.

[Problems to be solved by the invention] However, in such a device, if the CPU program runs out of control for some reason, the magnetic head will not stop even though the zero track sensor has detected the zero track position. Furthermore, there is a problem in that the magnetic head is moved outside the magnetic disk, and as a result, the magnetic head comes off the magnetic disk, making it impossible to write or read information, or damaging the magnetic head and the magnetic disk. Also,
If the CPU's program runs out of control, the magnetic head moves further inward than the innermost track position of the magnetic disk, and the presser foot used to secure the magnetic disk collides with a plate, damaging the magnetic head. There was also.

This invention was made to solve these problems. Even if the central processing unit runs away with a program, the magnetic head can be reliably stopped on the storage medium, and the runaway program can be notified to the outside. An object of the present invention is to provide a magnetic recording device that can be reliably managed by the computer when controlled by a host computer, for example.

[Means for Solving the Problems] This invention provides a disc-shaped storage medium for storing information;
A rotation mechanism is provided to fix the storage medium and rotate it at a constant speed, and a rotation mechanism is provided that is movable in the radial direction of the storage medium rotated by this rotation mechanism, and is provided to write and read information to and from the storage medium. a stepping motor that controls the movement of the magnetic head; a member that is attached to the rotating part of the stepping motor and rotates with the rotation of the motor; A zero track sensor detects a zero track by detecting the rotational position of a member when it moves to a track position, and a magnetic head is provided near the zero track sensor to a predetermined position outside the zero track position on the storage medium or A movement position limit sensor that detects the position of a member when it moves to a predetermined position inside the innermost track position, a rotation mechanism, a magnetic head,
A central processing unit that programmatically controls a stepping motor, a zero track sensor, etc., a means for inputting a short-time reset signal to the central processing unit based on the member detection output from the movement position limit sensor, and a reset signal to the central processing unit by this means. means for inputting an interrupt signal to the central processing unit when the input of the iJ is stopped; If the magnetic head is on the outside, move the magnetic head inward, and if it is on the inside, move the magnetic head outward, output an abnormal signal to the outside, and then start program control from the beginning. It is something that makes you

[Operation] By having such a configuration, the present invention prevents the magnetic head from being moved outside the zero track position or inside the innermost track position of the storage medium even if the central processing unit runs out of program. Even if there is, the movement position limit sensor detects it and resets the central processing unit, thereby prohibiting further outward movement of the magnetic head, and sends an abnormality signal to notify the outside of the occurrence of an abnormality after the reset is released. is output, and Pro6-Durham control is performed from the beginning.

[Embodiments of the invention] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a partial view showing the configuration of the main parts, in which 1 is a magnetic disk which is a storage medium, and 2 is a plate for fixing the magnetic disk 1. The presser base 2 is rotated together with the magnetic disk 1 by a spindle motor, which will be described later. Reference numeral 3 denotes a magnetic head, and reference numeral 4 attaches the magnetic head 3 to its tip, and is rotatable clockwise and counterclockwise around the other end. 5 is a pulley rotatably operated by a stepping motor which will be described later; 6 is an arm whose distal end is in contact with the pulley 5 via a belt, and whose other end is rotated by the same axis as the arm 4; This is an actuator that is movably provided. That is, the relationship among the arm 4, pulley 5, and actuator 6 is such that when the pulley 5 is rotated by the stepping motor, the actuator 6 rotates clockwise or counterclockwise around the other end, thereby causing the arm to rotate. 4 is designed to rotate. The tip of the actuator 6 is fan-shaped, and the rotation range of the pulley 5 is determined by the length of the tip. This rotation range is such that the magnetic head 3 is connected to the magnetic disk 1.
It is determined to allow sufficient margin for movement in the radial direction. An interrupter member 7 that rotates with the rotation of the pulley 5 is attached to the lower part of the pulley 5, and when the magnetic head 3 just reaches the zero track position on the magnetic disk 1, the interrupter member 7 is positioned to interrupt the optical path. For example, an optical zero track sensor 8 is provided. In the vicinity of the zero track sensor 8, when the magnetic head 3 passes through the zero track position, moves further outward, and comes just before the position where it comes off the top of the magnetic disk 1, the optical path is interrupted by the interrupter member 7. For example, an optical movement position limit sensor 9 is provided at the position. The movement position limit sensor 9 also detects when the magnetic head 3 passes through the innermost track position of the magnetic disk 1 and moves further inward, and the presser is just before colliding with the plate 2. The optical path is also interrupted by the interrupter member 7.

FIG. 2 shows a circuit showing a control section, and 11 is a reset terminal RE.
A central processing unit (hereinafter referred to as CPU) equipped with a SET and an interrupt terminal INT, 12 an I10 port, and 13 a transmission interface for exchanging information with a host computer. The CPU 11 has a built-in ROM that stores program data, a RAM that stores control information, and the like. The CPU 11 controls the I10 boat 12 via the pass line 14, outputs information to the magnetic head 3, takes in information from the head, and takes in information from the zero track sensor 8, Further, the motor drive circuit 15 is controlled to drive the stepping motor 16 mentioned above, and the motor drive circuit 17 is controlled to drive the spindle motor 1 mentioned above.
There is one drive of 8 in row 9. Further, the CPU 11 controls the transmission interface 13 via the path line 14, and controls the transmission of information and signals with the host computer.

The movement position limit sensor 9 consists of a light emitting element 9a and a light receiving element 9b, and the output of the light receiving element 9b is supplied to the input terminal of one operational amplifier.

A reference voltage from a reference voltage setting circuit 20 is input to the heir apparent of the operational amplifier 19. The output of the operational amplifier 19 is supplied to an input terminal A of a first monostable multivibrator 21 whose oscillation time is set by a capacitor C1 and a resistor R. The first monostable multivibrator 21 outputs this output from its output terminal to the CPU 1.
It is supplied to the input terminal B of the second monostable multivibrator 22 whose oscillation time is set by the capacitor C2 and the resistor R2. The second monostable multivibrator 22 sends the output from its output terminal Q to the interrupt terminal I of the CPU 11.
It supplies to NT.

The CPU 11 starts the program control operation shown in FIG. 3 when the power is turned on, or when a reset pulse is input to its reset terminal RESET and then the input is canceled and no interrupt signal is input.

That is, first, the ports and RAM are initialized, and then the rotation of the spindle motor 18 is started. Then, it is checked whether the spindle motor 18 is rotating normally or not, and if it is abnormal, the progress of the program is stopped. Further, if the spindle motor 18 is rotating normally, it is next checked to see if there is any abnormality in anything other than the spindle motor 18, and if there is an abnormality, a write inhibit output is sent out to stop the transition program control. If there is no abnormality as a result of this check, the magnetic head 3 is moved to a position where the zero track sensor 8 detects the interrupter member 7 and set at the home position. Subsequently, the write prohibition is canceled and the movement of the magnetic head 3 is controlled by signal input from the host computer to write and read information.

Furthermore, when an interrupt signal is input to the interrupt terminal INT, the CPU 11 starts a program control operation for interrupt processing shown in FIG.

That is, the magnetic head 3 is turned on and off by the zero track sensor 8 and the movement position limit sensor 9.
The position of the magnetic head 3 is detected, and when the magnetic head 3 is on the outer circumferential side, the magnetic head 3 is moved inward, and when it is on the inner circumferential side, the magnetic head 3 is moved outward. When this control is completed, information such as write prohibition is output as an abnormal signal to the host computer via the transmission interface 13. And after this, the third
The program control of the figure is started from the beginning.

In the apparatus according to the embodiment of the present invention configured as described above, the CP
As long as tJll is operating normally without program runaway, the magnetic head 3 is always set at the zero track position and positioned at the home position to write and read information on each track.

However, if CPLJll goes out of control for some reason, positioning at the home position becomes impossible, and for example, a situation occurs in which the magnetic head 3 is moved further outside than the zero track position. When such a situation occurs, the interrupter member 7 will further rotate clockwise due to the rotation of the pulley 5. Thus, the optical path of the movement position limit sensor 9 is interrupted by the interrupter member 7. When this happens, the output of the operational amplifier 19 is inverted from high level to low level, and the first monostable multivibrator 21 operates at the fall of the output. However, from the output terminal Q of the first monostable multivibrator 21 to the capacitor C
A short-time, low-level reset signal determined by the time constant of I and resistor R1 is connected to the reset terminal RESET of CP (Jll).
is input, and CPtJll is reset. As a result, the CPU 11 resets the program, stops the operation of the stepping motor 16, and stops the outward movement of the magnetic head 3. Then, when the input of the reset signal is stopped, the monostable multi-pibre=13-22 of M2 is activated. Then, a low-level interrupt signal is input from the output terminal d of the second monostable multivibrator 22 to the interrupt terminal INT of the CPLJll for a short period of time determined by the time constants of the capacitor C2 and the resistor R2.
The CPU 11 begins to perform interrupt processing. This interrupt processing checks that the magnetic head 3 is located at the outermost circumference, thereby reliably preventing the magnetic head 3 from moving inward and coming off the top of the magnetic disk 1. C
The PU 11 outputs information such as write prohibition indicating that an abnormality has occurred in the program to the host computer as an abnormality signal. The cPUll then performs program control from the beginning, and the magnetic head 3 is thereby returned to the zero track position of the magnetic disk 1, that is, the home position. Therefore, when write or read information is input, the magnetic head 3 can immediately operate. The above description has been made of the case where the magnetic head 3 moves outward from the zero track position, but similar control is performed when the magnetic head 3 moves inward from the innermost track position. That is, when the magnetic head 3 moves inward from the innermost track position, the rotation of the pulley 5 causes the interrupter member 7 to rotate counterclockwise, thereby blocking the optical path of the movement position limit sensor 9 from the right side in the figure. . Thus, the output of the operational amplifier 19 is inverted from high level to low level, and at its fall, the first monostable multivibrator 21 operates, and a reset signal is input to the reset terminal RESET of the CPU 11, resetting the CPU 11. . As a result, the CPU 11 resets the program, stops the operation of the stepping motor 16, and stops the movement of the magnetic head 3 inward. Then, when the input of the reset signal stops, the second monostable multivibrator 22
operates and an interrupt signal is sent to the interrupt terminal INT of the CPU 11.
is input, and the CPU 11 begins to perform interrupt processing. This interrupt process checks that the magnetic head 3 is located at the innermost circumference, thereby reliably preventing the magnetic head 3 from moving outward and colliding with the holding plate 2 of the magnetic disk 1. The CPU 11 outputs information such as write prohibition indicating that an abnormality has occurred in the program to the host computer as an abnormality signal. Then, the CPU 11 starts to perform program control from the beginning, and thereby the magnetic head 3 is returned to the zero track position of the magnetic disk 1, that is, the home position. Therefore, when write or read information is input, the magnetic head 3 can immediately operate.

In this way, even if the CPU 11 runs out of control, there is a risk that the magnetic head 3 may move too far outward or too far inward, causing the magnetic head 3 to come off the magnetic disk 1 or the presser to collide with the root 2. There is no such thing. Therefore, there is no risk that reading or writing information will become impossible or that the magnetic head 3 or magnetic disk 1 will be damaged. Moreover, since the host computer is notified that there is an abnormality in the movement of the magnetic head 3 due to a runaway program, the host computer can immediately know that an abnormality has occurred in the apparatus, and can reliably manage the apparatus. Further, after the interrupt processing is completed, the magnetic head 3 returns to the home position and waits for the next operation, so that it is possible to operate quickly for writing and reading information.

In addition, in the above embodiment, an example was described in which optical sensors were used as the zero track sensor and the moving position limit sensor, but the sensor is not necessarily limited to this, and for example, a micro switch may be used. .

[Effects of the Invention] As detailed above, according to the present invention, even if the central processing unit runs out of program, the magnetic bed can be reliably stopped on the storage medium, and the program runaway can be notified to the outside. For example, it is possible to provide a magnetic recording device that, when controlled by a host computer, can be reliably managed by the computer.

[Brief explanation of drawings]

The figures show an embodiment of the present invention, in which Fig. 1 is a partial diagram showing the configuration of the main part, Fig. 2 is a circuit diagram of the main part, and Fig. 3 is a CPU.
FIG. 4 is a flowchart showing the main processing by the CPU, and FIG. 4 is a flowchart showing the interrupt processing by the CPU. 1...Magnetic disk, 2...Platform with presser, 3...
Magnetic head, 4...arm, 5...pulley, 6...
・Actuator, 7... Interrupter member, 8...
・Zero track sensor, 9... Movement position limit sensor, 11... Central processing unit (CPU), 16...
・Stepping motor, 18... spindle motor,
19... operational amplifier, 21... first monostable multivibrator, 22... second monostable multivibrator. Applicant's agent Patent attorney Takehiko Suzue Figure 3 1y Kaisho 6l-82381 (7) Go to the start of Figure 4

Claims (1)

[Claims] A disc-shaped storage medium for storing information, a rotation mechanism for fixing the storage medium and rotating it at a constant speed, and a rotation mechanism for rotating the storage medium at a constant speed, and a disk-shaped storage medium for storing information, and a rotation mechanism for rotating the storage medium at a constant speed. a magnetic head that writes and reads information to and from the storage medium; a stepping motor that controls the movement of the magnetic head; and a member that is attached to the rotating part of the stepping motor and that rotates as the motor rotates. , a zero track sensor that detects the rotational position of the member to detect zero track when the magnetic head moves to a zero track position set on the outer circumferential side of the storage medium; and a zero track sensor provided near the zero track sensor. , a movement position limit sensor that detects the position of the member when the magnetic head moves to a predetermined position outside the zero track position or to a predetermined position inside the innermost track position on the storage medium; and the rotation mechanism. , a central processing unit for program-controlling a magnetic head, a stepping motor, a zero track sensor, etc.; means for inputting a short-time reset signal to the central processing unit based on the member detection output from the movement position limit sensor; and means for inputting an interrupt signal to the central processing unit when the input of the reset signal to the central processing unit is stopped, and the central processing unit stops the program control by inputting the reset signal, and then inputs the interrupt signal. When there is an input, the position of the magnetic head is confirmed, and if the magnetic head is on the outside, the magnetic head is moved inward, and when it is on the inside, the magnetic head is moved outside, and an abnormal signal is output to the outside. A magnetic recording device characterized in that program control is started from the beginning after that.