JPS5877064A - Disk driving device - Google Patents

Abstract

PURPOSE:To ensure an automatic reset to a normal operation, by detecting that a head has a runaway outside the regions of the most outer and inner circumferences of a disk recording medium, and then producing the control signal to stop the revolutions of a motor or to reverse the motor. CONSTITUTION:A dricing motor 1 drives a spindle pulley 4 via a pulley 2 and a belt 3. A magnetic head 6 is held by a carriage 7 and has reciprocal motions along a guide shaft 8 and by the revolutions of a rotary shaft 10 of a step motor via a spiral plate 9 which functions as a plate cam having a spiral groove. The carriage 7 has limit switches SW1 and SW2 which are pressed by working bars 13 and 14 at its both ends. The fact that the head 6 arrives at the most inner or outer circumference of a recording track is detected by the closure of the switches SW1 and SW2. Then the revolutions of the step motor are stopped or reverse. As a result, a runaway of the head 6 is prevented to protect the head from the breakdown.

Description

[Detailed Description of the Invention] The present invention provides an O-disk drive device such as a Fukubo disk, etc.
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In recent years, disk-shaped media have become widely used. For example, a floppy disk device K>%f> uses a floppy disk with a magnetic material coated on a sheet-like plate material as a recording medium, and while this floppy disk is driven to rotate by a rotating mechanism, the disk wrinkles. The OJP is configured to record (write) and reproduce (read) information via a magnetic head that moves back and forth in the radial direction.

Therefore, for example, when recording or reproducing information based on commands from the central processing unit (OFυ), it is necessary to ensure that the above-mentioned head is positioned securely on the predetermined memory 17 on the disk 7a. It becomes necessary. In this case, the floppy disk usually has 77 tracks (in the case of a standard disk, 26 sectors are divided into 26 sectors for each track of the floppy disk). If the position is determined, the 0 positioning to the predetermined sector can be performed in one revolution of the 70-point disk.

Because of this, a positioning mechanism is required to reliably position the head in a predetermined position in the stirrup. A system mechanism is adopted.

The operation of positioning this head at a predetermined track position fK, that is, the shifter operation, is performed by driving the step motor I by inputting a track number and a seek command signal (step signal) from OPυ. It is started by moving the head from the track it is currently located on, in this case 0? Abnormal behavior in the U() program,
If the head (and the cartridge on which it is mounted) overruns outside the predetermined recording track O range due to immediate action of the step motor, such as reading the number of pulses supplied to the step motor, such as 1lta. Condemn - If this kind of runaway phenomenon occurs, the head is out of motion and the step motor is in a state of trouble if it rotates any further.2!? There was a risk of damage to the floppy disk in the head and, in some cases, other head positioning mechanism parts, due to overheating and vibration of the step motor when the head was closed.

For this reason, conventionally, the step motor malfunctions and the 1kV
Various countermeasures have been considered to prevent this, but once an overrun has occurred, there is no other option than to wait for the operator to notice the abnormality and take measures such as stopping the equipment.

The present invention was made in view of the above circumstances.
! ), the purpose of this is to detect when the head malfunctions and overruns outside the predetermined compounding track range, and to stop or reverse the step motor or issue an alarm. Therefore, it is possible to provide a disk drive device that takes appropriate measures.

In order to achieve this object, the present invention is provided with a detection means for detecting head overrun and generating a control signal at the end of a predetermined recording track range. Hereinafter, the present invention will be described in detail using an actual example.

1F is a plan view schematically showing the internal structure of an embodiment of the present invention. This is an example of a case where a 70 Tubiidaster device K is applied.
is the spindle pulley, 5 is the head donlenoid, 6
Line magnetic head, T is carriage, 8 is guide shaft 7),
@tj spiral plate, 1ltj stepmo-ag rotation axis,
11 is a spring, and 12 is a truck OO photo switch I. That is, in the case of the magnetic head, a spiral plate drive system is used for the positioning mechanism of the magnetic head. 0 as cam
The magnetic head 6 reciprocates along the guide shaft via the spiral *st.The step monitor is powered on the back side of the subbar plate 9, which is not visible in the figure.
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Also, although omitted in the figure,)) A two-dimensional disk is arranged with the same rotational axis as the spindle drive 94, and the magnetic head 6 is arranged on this disk.

These have a well-known structure as the Mezu-Kugame 70 Tsubii disk housing.

Mount the above magnetic head e on the ζren.
K operating piece 13t? and 14 are installation.

Further, a switch 8W1 is disposed at a position to be operated by the actuating piece 13 when the magnetic head I overruns the outermost rack O of the predetermined recording tracks of the disk. On the other hand, a switch SWZ is disposed at a position to be operated by the operating piece 14 when the magnetic head 6 overruns the last track (for example, 76 tracks in the case of a standard track).

, Tonoyo 5 switch 8W1. As f12,
for example! Various O switches such as micro switch, photo switch, proximity switch, etc. can be used. In this case, these switches are sufficient if they can simply determine whether or not the magnetic head 6 has run outside the predetermined recording track OSS, but accuracy is not required.%A
.

Therefore, in the disk drive device having the above configuration,
When the magnetic head 6 goes beyond the range of a recording track of a predetermined width,
0) When overrunning to the outside of the rack, activate the flcd switch 8W1, and conversely, when overrunning to the inside of the top rack, activate the switch swg.
By operating each of the above, desired control signals can be issued to perform abnormality processing.

The operation of the 70-ton disk device is controlled by a fan roller as shown in FIG. In the figure, 20 is a central processing unit 51 (opυ) as the main unit of the computer, 21 is a tf memory, and 22 is an input/output 41! -123 is a same-side device, 24 is a 7a disk device (Toll), and 25 is a flexible disk controller. This controller 25Fi, opu interface 251, controller/format section'
15b and 7a disc interface 25
It is composed of eK. ,, OPU interface Ha#i%wq status, track access,
Giving and receiving sector artless etc. and day! It has a function to control transfer, and it has a function to control transfer. Ivy part 2
5b is the head O position stirrup control function and 7
It has the function of writing and reading data according to the automatic instructions. In this case, the track and sector settings in the seek operation both depend on the program of the PU 20, but the operation of this embodiment will be explained with reference to FIG. That is, in FIG. 3, as mentioned above, due to an abnormal operation of the program, etc., the step page immediately operates and the head is set to 00.
) When the rack is overrun, the switch 8W1 operates to generate a control signal 81, which sets the set-reset/7-rip 70-tub circuit sO. As a result, the roaring lip 70 tube circuit 300 output Q1
1- becomes L level, and the output of the AND gate circuit 31 is set to L level, and the step field - is outputted via the motor control circuit 32.
The step signal supplied to step S3 is cut off, and the step motor 33 is stopped.

These operations are similar even when the head overruns the last track and operates 8W2 to generate control signal 88. However, in this case, the flip 7a tube circuit is 3
34 is used for 00s.

In this way, the head 00) overruns the rack or the last track and switches aw1. The output QOZ of the p set reset flip-flop circuit 30.
When one of these signals is brought to L level, the output of OR gate circuit 35 also goes to L level.Using this output signal, for example, the light emitting diode 36 can be activated to issue an alarm, thereby alerting the operator to an abnormal condition. report. Also,
It is also possible to apply this output signal to the motor control circuit 32 to perform abnormality processing in which the step motor 33 is stopped. In FIG. 3, R1 and 12 represent reset signals for the set/reset/arive flop circuits 30 and 34, respectively, and 8T represents a step signal.

Furthermore 1. When the switches 8W1 and 8W2 are operated, the control signals 81 and 82 can be used to not only stop the step motor 33 but also reverse rotation.

That is, in the 70-tube disk device, as is well known, the direction of movement of the head is specified by K, which gives a direction signal from the controller to the step motor when positioning the head.

Therefore, the direction signal is controlled by the signal 81 from the switch 8W1 to move the head toward the inside of the disk, and the direction signal is controlled by the signal 82 from the switch SW2 to move the head toward the outside of the disk. By allowing the step motor 33 to rotate in the opposite direction without stopping, the overrun head can be moved in the opposite direction and returned to the normal track range. However, in this case, since the head is in a loaded state, the head and the medium (disk) are likely to be damaged. In order to prevent this, it is effective for K to be able to simultaneously release the automatic control signals 81 and 82 at the same time.

If the floppy disk drive is to be returned to its normal operating state after an operator or the like has completed the abnormality processing described above, a reset signal is given to the floppy disk drive from the controller by an external O operation or the like.

In the above-mentioned embodiment, only the case where overrun detection switches 8W1 and 15W2 were provided on both sides of the outside and inside of the disk for a predetermined recording track range was described, but the floppy disk device Depending on the type, when positioning the head,
There is also a method of returning to the track and then applying a step signal to step %-7 again based on the OPU program to perform a seek operation.1 In this case, overrun occurs especially at the last track @ (SWZ side) K. Easy to do.

In such a case, overrun detection means need not necessarily be provided on both sides of the predetermined recording track range, and may be provided only on the last track.

In addition, all of the above explanations have been made using a 70-tube disk device as an example, but the present invention is not limited to this, but relates to a device for recording and reproducing information by rotationally driving a disk-shaped recording medium. Of course, it can be applied generally.

As explained above, according to the present invention, when the head malfunctions and overruns outside the predetermined recording track range, this is promptly detected and the step motor is stopped or rotated in reverse. Some trout have the excellent effect of being able to automatically handle abnormalities such as issuing a warning.

[Brief explanation of the drawing]

Figure 1 is a plan view showing an embodiment of the present invention, Figure 2 is a plan view showing an embodiment of the present invention.
7 a Tsubi disk; block diagram showing the controller;
FIG. 3 is a block diagram showing the operation principle. 1Φ... Drive motor, 4... Spindle pulley, 5... Head load solenoid, 6... Magnetism head, T... ψ medium spear, 8... Guide shaft, 9... φ・Multi-spiral plate, 1o...-Step plate-Y0-11 Rotating axis, 13.14...Operating piece, 2
0... Central processing unit fl, 24 @... Floppy disk i! Electricity, 25-...Floppy disk controller, SO, $4@-...Seratori Ryu 7lJ Tsupfu p Tsubu vesicle, 31...And gate circuit, 32
... Working motor control circuit, 33... Step motor, 35... OR gate circuit, 36ψ... Light emitting diode, 8 W 1 m ''''''... Fight Suzutsuchi. Patent Applicant: Tamura Electric Manufacturing Co., Ltd. Agent: Kazuki Yamakawa (Mr. Tae 1) Figure 1

Claims (1)

[Claims] 00) A disc-shaped recording medium having recording tracks of a predetermined width from a rack to n tracks is driven to rotate, and a head scans the surface of the medium to record and reproduce dynamic information. (The head is reciprocated in the radial direction of the medium by a drive motor.)
By means of a disk drive which positions the head on a predetermined track of the track head, the head is positioned outside the track elia of the predetermined width. A distal drive AT characterized in that a detecting means is designed to detect an overrun and output a control signal.