JPS59127265A - Floppy disk driving device - Google Patents

Abstract

PURPOSE:To reduce the attachment space of a detector and to secure the engagement of a disk by driving a motor by a detected output generated when a light transmission type index hold detector is shielded from light by the insertion of the disk, and stopping its rotation when the number of times of detection attains to a set value. CONSTITUTION:An index hole 8 is formed piercing a case 6 and the disk 7. Photoelectric elements 10 and 11 detect the light transmission type index hole. When an FD8 is not inserted, a phototransistor TR11 turns on and an index flag INF is set. When the FD3 is inserted and the TR11 turns off, a timer 13 is reset and restarts, the motor 1 rotates, and a motor ON flag MONF is set. Thus, the FD3 is held on a spindle 2. When a detector detects the hole 8 during the correct rotation, the INF is set, the timer 13 is set and held, and a flag INF2 is set to ''1''. When the hole 8 is passed, the timer 13 is reset and restarts. This operation is repeated to set a flag INF4 and the motor 1 is stopped.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a floppy disk drive device.

[Technical background of the invention and its problems]

Conventionally, in floppy disk drive devices, a detector for detecting the insertion of a floppy disk is used in addition to an index hole detector for detecting the index hole of the floppy disk, and when this detector detects the insertion of a floppy disk, the 70 disk There is a device that rotates a motor that rotationally drives a spindle to which a floppy disk is fitted for a certain period of time to smoothly fit a floppy disk to a spindle.

However, this method did not require a detector separate from the index hole detector, and there was a problem with mounting space. Furthermore, if the floppy disk is not smoothly fitted to the spindle, there is a problem in that the motor stops rotating with incomplete fitting.

[Purpose of the invention]

This invention was made to solve these problems, and the mounting of the detector can save space, ensure the fit of the floppy disk to the spindle, and furthermore, the motor can be controlled to stop. To provide a floppy disk drive device which can ensure re-operation of a motor by re-inserting a floppy disk by ejecting the floppy disk even when the floppy disk is removed.

Another object of the present invention is to provide a floppy disk drive device that can reliably stop the rotation of the motor when the floppy disk is inserted and the motor starts rotating, and then the floppy disk is removed.

[Summary of the invention]

In this invention, when a translucent index hole detector provided to detect the index hole of a floppy disk is blocked from light by inserting a floppy disk, the detection output at that time starts the rotation of the motor that rotates the spindle. Then, the number of times the index hole is detected by the index hole detector is counted by a counter, and when the count value of the counter reaches a preset value, the rotation of the motor is stopped, and the index hole detector is detected by the 70-tip disc. A timer is provided that is restarted every time the light is interrupted, and a counter is reset if the timer is not restarted for a certain period of time.

Further, the present invention resets the counter and stops the rotation of the motor.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

In Fig. 1, 1 is a motor that rotationally drives a spindle 2, and 3 is a floppy disk which is provided with a clamp 4 in its central opening and is held by inserting the clamp 4 into the recess 6 of the spindle 2 from the outside. It's a disc. Said 70
As shown in FIG. 2, the Tsupid disk 3 houses a disk medium 7 in a case 6, and has an index hole 8 near the central opening shared by the case 6 and the disk medium 7, and also has a radius of the disk medium 7. A contact elongated hole 9 for a head (not shown) for writing and reading information is provided in the case 6 along the direction.

A light-emitting diode 10 as a light emitter and a phototransistor 11 as a light receiver are placed between the fluoro-bidisc 3 at a position passing through the index hole 8 when the fluoro-bidisk 3 is rotated while being held by the spindle 2. Translucent index hole detectors are arranged opposite to each other with the diaphragm interposed therebetween.

FIG. 3 is a block diagram showing the main circuit configuration, which is actually implemented in a microcomputer. That is, 12 is a microprocessor with a built-in timer 13, and this microprocessor 12 is connected to the ROM, (read/write) via a pass line 14.
only memory) 75, RAM (random access)
Memory) 16, IN? N tote and OUT port 18 are connected. The microprocessor 12H ROM
RAM16, IN° based on program data of 15
The port 17 and the OUT port 18 are controlled respectively. The IN port 17 receives an index signal IN from the index hole detector.

Inputs motor signal MS, etc., and outputs motor ON signal M from OUT port 18. N, pulse motor control signals A, B, C
,D,) outputs a rack zero signal TS, a ready signal R8, etc. The RAM 24 has a motor ON flag MO.
NF, an index flag INF, and flags INFI to INF forming a counter are provided.

The microprocessor 12 performs the main processing shown in FIG. 4 when the power is turned on. i.e. RAM clear, OU
T-port reset is performed first, followed by index check, motor signal check, step signal check, and write signal check in sequence.

As shown in FIG. 5, the index checker checks whether the phototransistor 11 is ON using the index signal IN, and if it is ON, it then checks whether the index flag INF is set to 11''. However, if INF = 1, this index check process is exited. Also, if INF = 0, @1 is written to INF.
'' and keep the timer 13 set. Next, check whether the 7 lag INF is set to ``1'', and if INF s = 1, set the flag INF to 1#. , stops the output of the motor ON signal MoN, and resets the motor ON flag MONF to @0'' to exit this index check process.
If F a = O, then flag INF * is "1"
If INF1=1, set the flag INFs to 11, exit from this index check process, and check whether INF1 is set to 1. If = 0, the flag INF is set to ``@1'' and exits from this inte x check process.

On the other hand, if phototransistor 1 is OFF, timer 13
Reset and restart, then check whether the index flag INF is set to 11",
If INF=O, this index check process is exited. Also, if INF = 1, reset INF to '0', then check whether flag INF is set to 11'', if INF4 = 1, exit from this index check process, and if INF = 0, motor O
N signal M. N and motor ON flag MONF
is reset to '0' and exits from this index check process.

The timer J3 times up after a certain period of time unless restart control is performed, and when this time-up occurs, the timer interrupt process shown in FIG. 6 is performed. This resets the flags INF * r INF s * lNF4 to 'O', then stops the output of the motor ON signals M and N, and sets the motor ON flag MONF to '0'.
Reset to .

In the embodiment of the present invention configured in this manner, when the floppy disk 3 is not inserted, the phototransistor 1
Since 1 is ON, index flag INF is 1.
It is set to 1#. 70 in this state. When the PID disk 3 is inserted and the phototransistor 11 is turned off, the timer 13 is reset and restarted, and the integer is activated.

The flag INF is reset to "0", and the motor ON signal M is activated. N is output, motor 1 rotates, and motor ON flag MONF is set to 1#. In this manner, the spindle 2 rotates, the clamp 4 of the floppy disk 3 is smoothly fitted into the recess 5 of the spindle 2, and the floppy disk 3 is held by the spindle 2.

When the floppy disk 3 rotates correctly, the index hole detector detects the index hole 8,
Phototransistor 1 is turned on again. This is fi
INF is set to @1", the timer 13 is kept set, and the flag INF is set to "1". When the index hole 8 passes, the timer 13 is set to "1".
will be reset and restarted. Thereafter, the phototransistor 1 is turned ON and OFF again by the index hole 8, and the flag INF is set to '1'', and the timer 13 is restarted.
When is turned ON again, the flag INF is set to 11'', the output of the motor ON signal M.N is stopped, the rotation of the motor 1 is stopped, and the motor ON flag MONF is reset to 0''. The rotation of the motor 1 is stopped when the index hole detector detects that the floppy disk 3 has been inserted and rotated while being securely held on the spindle 2.

In this way, the trap index hole detector can also be used as a detector for detecting the insertion of the floppy disk 3, and the mounting space can be reduced. Furthermore, since the rotation of the motor 1 is started when the index hole detector detects the insertion of the floppy disk 3, and the rotation of the motor 1 is stopped after the index hole detector detects the index hole 8 several times, the spindle 2 The floppy disk 3 can be reliably fitted to the floppy disk.

Furthermore, when the floppy disk 3 is fitted to the spindle 2 and the motor 1 is stopped, when the floppy disk 3 is taken out, the phototransistor 11 remains on for a relatively long time, so the timer 13 eventually times out. Each flag INF 1 HI by timer interrupt
NF B +INF are all reset to 10", so if you reinsert floppy disk 3, motor 1
will be restarted under the same conditions as described above.

Further, when the floppy disk 3 is inserted and the floppy disk 3 is removed while the motor 1 is rotating, the phototransistor 11 is turned on and each flag INF is then turned on by a timer interrupt.

INF m and INF 4 are all reset to "o" and the motor 1 is stopped. Therefore, there is no problem that the motor 1 continues to rotate.

In the above embodiment, the motor is turned on by a timer interrupt.
Although the output of the signal was also stopped, this process may be omitted.

The above has described an embodiment in which this invention is implemented in software using a microcomputer, but since this invention can also be implemented in a hardware configuration, next we will focus on other embodiments of this invention in the drawings. This is explained with reference to.

That is, in the case shown in FIG. 7, a light emitting diode 10 is connected via a resistor 2 between the terminal and the ground, and a phototransistor 1 is connected via a resistor 22.

Further, the motor 1 is connected between the +V terminal and the ground. The collector output of the phototransistor 11 is connected to the inverter 2.
3 as an index signal IN and a D-type flip flop 24.25.

The signal is input to the T terminal of the D-type flip flop 28 via the inverter 27. Further, the collector output of the phototransistor 1 is inputted to the B input terminal of the retriggerable monostable multivibrator 29 via the inverter 23. Said flip 7
0 knob 24, 25, 26 is the front flip-flop 24
．． 25 Q terminal outputs are respectively sent to the subsequent stage
The monostable multi-pipe rake 29 responds to the rising edge of the signal input to the B input terminal trap, and operates for a certain period of time (the time it takes for the index hole 8 to rotate once). After a sufficiently long period of time, the terminal output is inverted from low level to high level.The terminal output of the flip-flop 26 is input to the D terminal of the flip-flop 28. The motor ON signal M.N, which is a terminal output and a low level signal, is input to an OR gate 30 having a negative input terminal, and the motor 1 is rotationally driven by the high level signal of the OR gate 30.
The output is inputted to the 24.25.260π (reset) terminal of each flip 70 through a node 3 having a negative input terminal. A signal obtained from the π terminal output of the monostable multivibrator 29 and the output of the inverter 23 via a buffer 32 is converted into a two-man NAND boot 3.
3, and the output of the Nant gate 33 is passed through the Noah dart 31 to each of the flip-flops 24, 25, 2.
It is input to the π terminal of 6. The motor ON signal M. N
The output of the initial reset circuit 34 is input to the π terminal of the flip-flop 28 via a NOR gate 35 having a negative input terminal. The output of the initial reset circuit 34 is also input to the monostable multivibrator 290R terminal.

In this device, when the floppy disk 3 is inserted, the output of the inverter 23 is inverted from high level to low level, and the output of inverter 27 is inverted from low level to high level. Then the flip-flop 28 is set and its π
A low level signal is output from the terminal and rotates the motor 1 via the OR gate J (7).After that, every time the index hole 8 of the disk 3 is detected by the index hole detector, the collector output of the phototransistor 11 is output. The output of the inverter 23 becomes a low level, and the flip-flops 24, 25, and 26 are set in sequence.The final stage 7 flip-flop 26 is set, and immediately after that, the output of the inverter 23 becomes a high level after passing through the index hole 8. When the floppy disk 3 becomes low level, the flop 28 is reset and its π terminal output becomes high level.The output of the OR gate 30 becomes low level and the motor 1 stops.If the floppy disk 3 is removed in this state, the inverter 23 When the output is high level, the π terminal output of the monostable multi-pie break 29 is inverted to high level after a certain period of time, and when the output of the Nant gate 33 is low level, the Pflops f24, 25, and 26 are all reset. 1, and when the floppy disk 3 is inserted again, the output of the inverter 27 becomes high level, the shift flip frog 28 is reset, the motor 1 starts rotating, and each of the 7 reset fz4, 2s, 2
e is sequentially set every time the index hole 8 is detected.

Therefore, in this circuit, the motor ON signal M is generated by a timer interrupt in the above-described embodiment. The same control as when N is not stopped can be achieved.

Also, the one shown in No. 8 is the Q of Flip Flora 7°28.
The terminal output and the output of the Nand gate 33 are input to the two-man NAND boot 36, and the output of the NAND f-to 36 is changed to the π terminal output of the flip-flop 28 and input to the OR gate 30. Princess 7
Remove the 0tube disk 3 and install the monostable multipigrator 2.
When the output from the terminal 9 becomes high level, each of the flip-flops 24, 25, and 26 is reset, and the output of the Nant gate 36 becomes irregular, and the rotation of the motor 1 is stopped.

Therefore, this circuit can perform the same control as the embodiment described above.

〔Effect of the invention〕

As described in detail above, according to the invention, the index hole detector can also be used to detect the insertion of a floppy disk, and the installation of the detector can reduce the space required, and the floppy disk can be fitted to the spindle 9. To provide a floppy disk drive device which can ensure the operation of the motor, and can also ensure the re-operation of the motor by reinserting the floppy disk by ejecting the floppy disk even if the motor is controlled to stop.

Further, according to the present invention, it is possible to provide a floppy disk drive device in which the rotation of the motor can be reliably stopped by inserting a floppy disk.

[Brief explanation of the drawing]

1 to 6 show an embodiment of the present invention, in which FIG. 1 is a partial sectional view showing the schematic structure of the main parts, FIG. 2 is a view showing the structure of a floppy disk, and FIG. A block diagram of the main parts of the microcomputer, FIG. 4 is a flowchart showing the main processing of the microprocessor, FIG. 5 is a flowchart showing the index check processing in the main processing, and FIG. 6 is a flowchart showing the tire interrupt processing of the microprocessor. 7th
8 and 8 are circuit diagrams showing other embodiments of the present invention. 1... Motor, 2... Spindle, 3... Floppy disk, 8... Index hole, 1o...
Light emitting diode, 11... Phototransistor, 12.
...i microprocessor, 13...dive, MONF
... Motor ON flag, INF ... Index flag, INF, ~INF, ... Flags forming the counter

Claims (2)

[Claims] (1) A motor, a spindle rotationally driven by the motor, a floppy disk inserted from the outside and fitted to the spindle, and a translucent index hole detector for detecting the index hole of the floppy disk. In the 70 disk drive device, when the index hole detector is shielded from light by the floppy disk when the floppy disk is inserted, the rotation of the motor is started using the detector output at that time;
Thereafter, the number of index holes detected by the index hole detector is counted in color/return, and when the count value of the counter reaches a preset value, the rotation of the motor is stopped, and the index hole detector is activated. 70 disk drive device, characterized in that a timer is provided which is restarted every time light is blocked by the floppy disk, and the counter is reset when the timer is not restarted for a certain period of time. (2) A spindle rotationally driven by a motor, a floppy disk inserted from the outside and fitted to the spindle, and a translucent index hole detector for detecting the index hole of the floppy disk. In the floppy disk drive device, when the index hole detector is blocked by the floppy disk when the 70-tube disk is inserted, the rotation of the motor is started using the output of the detector at that time;
Thereafter, a counter counts the number of index holes detected by the index hole detector, and when the count value of the counter reaches a preset value, the rotation of the motor is stopped, and the index hole detector detects the floppy disk. A floppy disk drive device comprising: a timer that is restarted every time light is blocked by a disk; and when the timer is not restarted for a certain period of time, the counter is reset and the rotation of the motor is stopped.