JPS61240476A - Magnetic disc device - Google Patents

Abstract

PURPOSE:To protect the magnetic disc and the titled device against an abnormal operation by so constituting the titled device that the driving of autoloading is made stop by the output from a timer even if the magnetic disc is not moved to the positions of the end of insertion/ejection. CONSTITUTION:An instruction EJECT is inputted to a D-type flip-flop (FF) 11 to set the FF 11 of an autoloading control circuit, then an FF 20 is triggered and the inverse of Q output becomes H. And a signal AUTO is outputted through gates 21 and 23, accordingly, the autoloading mechanism is actuated and the magnetic disc is ejected. When the disc stops at halfway because of, for instance, pressing by hand, it is feared that INSRT remains being H and the FF 20 continues not to be set as well as the AUTO also remains being H. The counter 18 that works as a timer starts counting clock when the gate 21 is L and makes a signal C be H after the lapse of a specified time. When the ejecting motion fails, the signal C resets the FFs 20 and 11 through gates 14 and 12.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a magnetic disk device using a replaceable medium such as a 70 disk.

(Summary of the Invention) The present invention relates to an autoloading mechanism that automatically inserts or ejects a magnetic disk as a recording medium into or from an apparatus by electrical means. When configuring an autoloading mechanism, a sensor is required to detect the start and end of insertion and ejection, but the present invention provides a control circuit that effectively reduces the need for these sensors and further prevents incorrect operation or non-operation. This realizes a control circuit that takes measures to stabilize autoloading operations under steady conditions.

(Prior Art) A conventional magnetic disk drive having an autoloading mechanism requires sensors for detecting start and end, making the mechanism complicated. Furthermore, the drive motor was controlled only by determining whether or not these sensors detected the steady position state of the magnetic disk. If the movement of the medium is blocked by an external obstacle, etc., the sensor that detects this will not be able to detect the steady end state forever, and if the motor, etc., which consumes relatively power, continues to rotate, it will waste power. At the same time, the motor continues to rotate under heavy load conditions due to the forced inhibition of autorope ink, resulting in the problem of heat generation and significant deterioration of the life of the motor. The present invention aims to solve this problem, and instead of adding separate sensors for controlling the autoloading mechanism, it aims to share the sensors that the magnetic disk drive basically has.

Furthermore, the present invention prevents the autoloading operation from starting when writing to a magnetic disk and destroying the data on the medium, and the autoloading operation starting while the motors are starting up and consuming power, increasing power consumption. It is prohibited to do so.

(Means for Solving the Problem) The magnetic disk device of the present invention includes a replaceable magnetic disk, a rotation drive means for rotating a medium in the magnetic disk, a magnetic head for reading and writing, and a selection of the track position of the magnetic head. A magnetic disk drive comprising a track selection means for controlling data, a control means for controlling data reading/writing, track movement, etc. by external input, and an autoloading mechanism for electrically driving the insertion or ejection of the magnetic disk. 2, the autoloading mechanism detects the setting state of the magnetic disk.
One of the two sensors is also used as a sensor for detecting that the magnetic disk is in a standby position where reading and writing are possible.

(Function) The above configuration of the present invention facilitates the configuration of the autoloading mechanism, and protects the magnetic disk, the mechanism and motor within the magnetic disk device, and the power source that drives it from abnormal operations. Safety measures will be taken.

(Embodiment) FIG. 1 is a block diagram of a magnetic disk device in an embodiment of the present invention.

1 to 9 constitute a magnetic disk device, and signals are sent and received to and from the computer 10, which is a host.

1 is a spindle motor that rotates the medium in the magnetic disk, and 2 is a motor that contacts the magnetic disk to write and write data.
A magnetic head for reading is connected to the v-realistic circuit 5. Reference numeral 5 denotes a step motor for driving a carriage equipped with a magnetic head, and reference numeral 4 denotes a control circuit that controls these operations based on commands from the host side. Further, 6 and 7 are motors and control circuits that constitute the autoloading mechanism, and sensors 1 and 2, which detect the position of the magnetic disk that moves by autoloading, are respectively 8 and 7.
It is 9. During the insertion operation, sensor 1 detects that the magnetic disk is inserted halfway into the device, and the drive for insertion is automatically performed. Sensor 2 detects that the magnetic disk is completely set, and the operation ends. becomes. Regarding the ejecting operation, the control circuit starts autoloading in response to the ejecting command from 10, detects a change in sensor 2, sensor 1, and ejects about half of the magnetic disk from the apparatus, and the operation ends. The sensor 2 also serves to detect whether a magnetic disk is present in the device, and thereby controls the rotation of the spindle motor and the operation of the step motor.

FIG. 2 shows an autoloading control circuit diagram of the present invention, and corresponds to 7 in FIG. 1.

First, to explain the ejection operation, a command EJECT is input to the D type flip-flop (hereinafter referred to as FF) 11, and when the device is in the selected state and the data input DS is at the °H# level, FFj1 is set to zero.

This will trigger FF20, and 1 output of 20 will become @H#, and AU will pass through NO game and 21.25.
The TO signal is output at °■''.

^UToFi This is to rotate the autoloading drive motor, and while AtJTO is °H'', the autoloading mechanism works and the magnetic disk is ejected.During ejection, sensor 2 goes into the detection state, and the output lN8ERT becomes “L”.
1 signal passes through OR gate 14.12 to FF11 and FF
20 and return AUTO to °L''. The above is a normal case, but lN5RT remains in °H# forever.
If the output of inverter 15 remains at low level, FF20 cannot be set forever, so AUTO is set to "
There is a danger that the magnetic disk will remain "H". This can occur if the magnetic disk is being held down by hand while it is about to be ejected, or if something stops it midway.1
8 is a caranta that works as a timer, and 21 is “L#
After that, the reset is released and the clock φ starts counting, and after a certain period of time has elapsed, the signal C is set to °R''.At the same time, the clock input is stopped by the action of the OR gate 17, and the output remains held. The set time of 18 is sufficiently longer than the time to normally complete the autoloading ejection operation, but if the ejection operation described above does not go well, the setting time of 1
8 causes signal C to pass through 14.12 to F'F11,20
will be reset and an abnormal termination will occur.

Next, to explain the insertion operation, the magnetic disk is inserted about halfway into the device. The signal becomes "H" and the inverter 15, which is the inverted signal,
The output of the CIN signal and the inverted signal of the CIN signal by the inverter 15 are input to the exclusive OR gate 22, and the signal is
When it becomes H'', AUTO is activated via 21.25. In other words, CfN is -L- and lN5ER?' is "
The autoloading operation is performed during TI-, and the magnetic disk is completely set in the device with CIN at °H'', and the autoloading ends.If under abnormal conditions, CtN remains at °H'' forever. If not, the timers 18 and 17 cause the signal C to stop the mu-UTO signal at the gate 25, as in the case of the discharge described above, and a protective operation is performed.

In addition, the output CIN from the sensor is essential to indicate the presence of a magnetic disk in the device, regardless of the autoloading mechanism, and by using this as a component of the autoloading mechanism, the sensor can be shared. .

Furthermore, each signal input to the OR gate 16 is 14.
12, FFfl is reset so that it does not receive the EJECT signal.

WR of each signal indicates that writing is in progress, and prevents the data from being erased due to movement of the magnetic disk during the writing operation. 5EEiK indicates that the magnetic head is moved by a step motor, and this prevents the power consumption of the step motor and the power consumption of autoloading from being superimposed and resulting in a large power consumption. RISK indicates the start time of the spindle motor and usually has a capacity of 5 seconds or less.

Since a particularly large amount of power consumption is required when starting the spindle motor, the power consumption is further prevented from increasing due to the autoloading operation. Note that the AC signal in the figure is a reset signal at power-on.

FIG. 5 is a timing chart of autoloading according to the present invention, and shows the normal operation in FIG. 2.

When inserting, CIN is from lN5ER'r75E@H-)
Signals up to I' are output and AUTO is set to °H''.

Also, when ejecting, the rising edge of the EJECT signal causes a to become °H4' and AUT until 2N8BRT falls to L''.
O is set to °H". C remains at °L" and the timer output has not yet been output.

FIG. 4 is a typing chart for autoloading according to the present invention, and illustrates the abnormal operation in FIG. 2.

Figure 4 (,) shows the case of an abnormality during discharge. INS
Since the ERT signal remains 1■1 forever, timer output C is generated, returning a and AUTO to °L''.

FIG. 4(,) similarly shows the recovery operation at the time of abnormality, and is the case at the time of insertion. The autoloading operation is started when the signal lN5ERT becomes °■", but if b based on the CIN signal does not become °L" forever, the timer operates and returns the AUTO output to °L".

FIG. 5 shows another embodiment of the autoloading control circuit.

Unlike FIG. 2, the timer that controls autoloading stop in the event of an abnormality has been changed from a digital circuit counter to a mono-staple multivibrator. The output of 21 is the negative trigger input (-T
RG) to form the AUTO output.

The resistor 25 and capacitor 26 create the set time width of the timer.

Even if the output of 21 continues to be at °L” level, the AU
TO disappears after a certain period of time and provides compensation in the event of an abnormality. The circuit in Figure 2 is entirely composed of digital logic circuits.
Although it is easy to implement as an SI, the circuit shown in FIG. 5 is simpler when configuring the circuit with individual parts.

(Effects of the Invention) As described above, according to the present invention, an autoloading mechanism that effectively uses internal sensors can be realized. Furthermore, it can prevent damage to the magnetic disk or magnetic disk device due to unforeseen circumstances, malfunctions caused by incorrect usage, noise, etc. and shorten its lifespan, as well as prevent important data on the magnetic disk from being lost due to autoloading operations. Things like this can also be prevented.

[Brief explanation of drawings]

! FIG. 1 is a block diagram of a magnetic disk device that is an embodiment of the present invention, FIG. 2 is a control circuit diagram for autoloading of the present invention, FIG. 5 is a timing chart showing the autoloading operation of the present invention, and FIG. (,), (b) are timing charts of the autoloading operation of the present invention, (,) shows recovery from an abnormality at the time of ejection, and (b) shows a case of recovery from an abnormality at the time of insertion. FIG. 5 is an autoloading control circuit diagram according to another embodiment of the present invention. 1...Spindle motor, 2-...-m air head. 5--Step motor, 6--Loading motor. 7... Autoloading control circuit, 8...
-・Sensor 1, 9...Sensor 2. EJECT・
...Ejection command. CIN...-Magnetic disk setting end signal. INSK R, I... - Magnetic disk insertion detection signal. Mu UTO・・・Auto loading drive signal, 2
4...Monostaple multivibrator. that's all

Claims (3)

[Claims] (1) A replaceable magnetic disk, a rotation drive means for rotating the medium in the magnetic disk, a magnetic head for reading and writing, a track selection means for selecting the track position of the magnetic head, and an external input for reading and writing data. In a magnetic disk device comprising a control means for controlling track movement, etc., and an autoloading mechanism for electrically driving the insertion or ejection of the magnetic disk, the autoloading mechanism detects a setting state of the magnetic disk. 1. A magnetic disk drive comprising two sensors, one of the two sensors serving also as a sensor for detecting that the magnetic disk is in a standby position where reading and writing are possible. (2) It has a timer that starts timing when the autoloading mechanism is inserted or ejected and measures a certain period of time, and even if the magnetic disk is not moved to the position where the insertion or ejection ends, the autoloading starts based on the output of the timer. 2. The magnetic disk device according to claim 1, wherein the magnetic disk device stops driving. (3) When the autoloading mechanism is in at least one of the following states: when the rotation drive means is activated, when the magnetic head of the track selection means is moved, and when writing is performed on the magnetic head;
The magnetic disk device according to claim 1, wherein an ejection command from the outside is prohibited.