JPS6192482A - Carriage feeding method of floppy disc drive - Google Patents

Abstract

PURPOSE:To make a titled floppy disc drive small in size and simple, and to recover easily a seek error by supplying a step feed signal which is larger than a track number to a pulse motor at the time of a start and at the time of recovering the seek error, pressing forcibly a carriage against a stopper means, and outputting a track '00' signal. CONSTITUTION:When a seek error has been generated, a controller 32 detects this error and drives a head 12 toward a stop position determined to the outside from the outermost periphery through an interface 24, and presses and fixes a carriage 18 at the stop position. Also, at the time of this movement to the outside from the outermost periphery, a step feed signal is supplied, therefore, a counter 36 outputs a signal, and as a result, a track '00' signal is supplied to the controller 32 through the interface 24, and its track counter is corrected to '0'. In this way, even at the time of the seek error, the error can be recovered easily.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a carriage feeding method for a floppy disk drive, and in particular to an improved carriage for a floppy disk drive that allows the floppy disk drive controller to always accurately indicate the head position. Regarding the sending method.

[Prior Art] A floppy disk with a magnetic recording medium coated on the surface of a flexible plastic thin film is driven to rotate, and a read/write head is moved in the radial direction of the 70-pin disk to write information at a desired track position. Floppy disk drives that read/write data are well known and are widely used as external storage devices for computers.

With the recent demand for downsizing of devices, it is desired that the floppy disk used in this scale be made smaller, as well as the floppy disk drive for driving the floppy disk.

As is well known, in order to correctly position the read/write head in a predetermined range from 1 to 6, a track counter is required to know the head position. Set this track counter to the reference position, for example OO when the head is on the outer periphery.
It is necessary to reset the track counter when the vehicle is located on a track, and for this purpose conventional devices are provided with a track OO position detector consisting of a photoelectric detector or the like. However, such a detector requires a relatively large amount of space within the device and has problems such as reduced assembly work efficiency.

Therefore, as an improved conventional carriage feeding method,
Separately from the floppy disk drive controller, a track counter is built into the rotubi disk drive side, and on the other hand, it measures the outer circumferential position of the carriage carrying the head (
A device has been proposed in which a mechanical stopper means is provided slightly, for example, half a pitch outside of the track (normally the OO track), and the position detector of the tramp 900 is removed.

According to this conventional carriage feeding method, when the apparatus is started, a step feeding signal larger than the number of tracks is sent to the pulse Tanabata drive circuit that drives the carriage, and the carriage is forcibly pressed against the stop means to drive the head. is positioned at the track OO position. Then, in this state, the track 00 signal is output and the track counter built into the floppy disk drive is initialized to O (directly set).As a result, the track counter corresponds to the correct head position, and this Later, the track counter performs a counting operation every time the head moves in response to a step feed command from inside, and when the read/write head is at the track OO position, the track counter outputs a track 00 signal to the controller.

[Problems to be Solved by the Invention] However, in such conventional devices, the track counter in the floppy disk drive preferentially indicates the track position, which results in inconvenience when a seek error occurs. There was a problem that occurred.

In other words, when a seek error occurs, the count value of the track counter may be smaller than the actual position of the head. In such a case, the head may be forcibly returned to the track OO position to correct the error. Even if this is done, the head cannot return to the tran 900 position because the indicated value of the track counter takes priority, and there is a problem that other repair methods have to be used to correct the error, and the circuit configuration This has caused problems such as complicating the process and lengthening the repair time.

The present invention has been made in view of the above-mentioned conventional problems, and provides an improved carriage feeding method that does not require either a track OO position detector or a track counter, and can repair seek errors with great ease. Our goal is to provide the following.

[Means for Solving the Problems] In order to achieve the above object, the present invention focuses on the fact that the track position can be recognized by the track detection means in the controller during normal read/write operations, and A correct track 00 signal is detected only when a seek error occurs.The track 00 signal is detected by providing a stopper means on the outside of the outer periphery of the carriage, and at the time of starting and repairing a seek error, a step larger than the number of tracks is detected. The present invention is characterized in that a feed signal is supplied to a pulse motor to forcibly press the carriage against the stopper means, and in this state a track 00 signal is output.

[Function] According to the present invention, the carriage is forcibly pushed to the outside of the transformer 900 position on the outer periphery not only when starting the device but also during a seek error, and only in this state does the floppy disk drive output a track 00 signal. Since we use a feeding method that corrects the track contents of the floppy disk drive controller, it is possible to avoid the conventional sequence error.
Pull repair is extremely 1! ! simply done, simplifying the equipment,
It is also possible to eliminate the track O◯ switch or the track counter in the floppy disk drive.

〔Example] Preferred embodiments of the present invention will be described below based on the drawings.

The figure shows 7 in which the carriage feeding method according to the present invention is applied.
The main parts of an O-tube disk drive are shown, and a read/write head 12 is connected to a floppy disk 10 which is attached to a disk drive motor (not shown) and driven to rotate.
is provided movably in the radial direction of the floppy disk 10.

That is, the read/write head 12 is supported on a carriage 18 guided by two guide rails 14 and 16 fixed to the device board, and the step motor 2
The read/write head 12 moves from the outermost track OO to the innermost track 80 by the feed drive of
track.

The floppy disk drive uses a pulse motor driver 22 to feed and drive the step motor 20.
The speed and direction of the step motor 20 are regulated by the step feed signal and direction signal from the interface 24.

In the present invention, the feed boob 926 of the step motor
A positioning pin 28 is fixed to the positioning pin 28, and a stopper 30 is provided within the rotation area of this positioning pin 28.
The stopper 30 is installed at the outermost track OO with the read/write head 12 in contact with the stopper 30.
It is set to be located outside of. Therefore, even if a further step feed signal is supplied from the pulse motor driver 22 to the step motor 20 toward the outermost circumference, the position of the read/write head 12 is regulated by the stopper means, and the read/write head 12 will not move further toward the outer circumference. Never.

The floppy disk drive interface 24 is connected to a floppy disk drive controller 32, and desired feed control is performed, and the read/write head 12 is pressed to the outside of the outermost periphery when the device is started or when a seek error occurs. The track 00 signal is detected and supplied to the interface 24 only in both of these cases.

That is, both the step feed signal and the feed direction signal output from the interface 24 are supplied from the AND gate 34 to the 81-base counter 36. This counter 36
consists of 81 counters that count and output the number of step feeds that is α (=1) larger than the total number of tracks on the floppy disk 10, and for this purpose, an 81-decimal counter is provided. Further, the output of the AND gate 34 is supplied as a step feed signal to the count input of the counter 36 and is also used as a timer start signal of the timer 38, which outputs the timer output to the clear input of the counter 36. Furthermore, timer 3
A feed direction signal is supplied to the clear input of 6 itself.

The feed direction signal is configured such that the AND gate 34 accepts only the feed signal in the outer circumferential direction. Therefore, the counter 36 counts 81 continuous step feed signals in the outer circumferential direction within a predetermined time, and in this state,
A signal is output to the latch circuit 40 only in this case.

The output of the latch circuit 40 is then returned to the interface 24 via an inverter 42 as a track 00 signal.

As described above, according to the present invention, the track 00 signal is output from the floppy disk drive only when the device is started and when a seek error occurs, and during other normal read/write operations, the track 00 signal determined at the start is used. An instruction to detect the track position is given on the floppy disk drive controller 32 side, and its operation will be explained in detail below.

When the floppy disk 10 is installed in the apparatus, 81 step feed signals are supplied from the controller 32 to the pulse motor driver 22 via the interface 24 by the power-on operation, thereby causing the step motor 20 to move toward the carriage 18. The read/write head 12 supported by the stopper means is moved to the outermost position and is pressed to a position slightly outside the track OO defined by the stopper means.

At the same time, the counter 36 counts 81 step feed signals and outputs a track 00 signal from the latch circuit and inverter 42 to the interface 24.
A track position detection circuit, such as a track counter, in the seat roller 32 is set to 0. Then, in the normal read/write after this, the step motor 20 drives the head 12 to the desired track by the given step feed signal, and since the maximum step feed signal in this normal state is 80 or less, the counter 36 does not output a signal, and therefore, according to the invention, the head 12
The track 00 signal is not outputted even when the track 00 is located on the disk 10, and the track position at each read/write is indicated only by the track counter of the controller 32.

Next, when a seek error occurs, the controller 32 detects this error and drives the head 12 from the outermost circumference to the IC stop position via the interface 24 in the same way as at the time of starting. The carriage 18 is pressed and fixed at the stop position. When moving outward from this outermost circumference, the step feed signal is 8.
1117! I is supplied, so counter 36 outputs a signal, resulting in a track 00 signal being provided to controller 32 via interface 24, as at startup, to correct its track counter to O.

Therefore, according to the present invention, error recovery can be easily performed even in the case of a temporary seek error, and other complicated correction operations are not required at all.

Of course, in the present invention, the number of step feeds at the time of startup and when a seek error occurs is not limited to 81, but can be set to any number greater than 80.

[Effects of the Invention J As explained above, according to the present invention, the device can be made smaller and simpler without having to incorporate the trough 900 position detector and track counter in the floppy disk drive, which were conventionally required. In addition, the counter in the controller can be effectively used to achieve the desired read/write operation.Furthermore, according to the present invention, even when a seek error occurs, the error can be easily corrected by the same operation as at startup. It becomes possible to do this.

[Brief explanation of the drawing]

The figure shows 70 to which the carriage feeding method according to the present invention is applied.
FIG. 2 is a schematic configuration diagram of a Tubi disc drive. 10: Floppy disk 12: Read/write head 18: Carriage 20: Step motor 24: Interface 32: Controller 36: 81-decimal counter. Applicant Citizen Time Co., Ltd. 7) Omorph 20

Claims (1)

[Claims] (1) It has a stopper means that stops the carriage at a position beyond the outermost track when the carriage is fed in the direction of the outer circumference of the track, and furthermore, a track 00 signal is sent by step feeding in the direction of the outer circumference set larger than the number of tracks. In the carriage feeding method of a floppy disk drive that outputs , when the device is started or a seek error occurs, a step feed signal larger than the number of tracks is given to the carriage feed pulse motor to output a track 00 signal to initialize the track position. A floppy disk drive carriage feeding method featuring error recovery