JPS5877007A - Data read-write switching system - Google Patents

Abstract

PURPOSE:To decide the write starting position regardless of the shifting speed of a magnetic recording medium, by detecting the contents of the data recorded in the 2nd data area and then switching the record to the 1st data area. CONSTITUTION:A read head 14 and a read/write head 15 are connected to waveform shaping circuit 20 and 21 respectively. The head 15 is set in a read mode before a card is inserted, and the read-out data is fed to a demodulating circuit 22 and an integration circuit 23 via the circuit 21. The output signal of the circuit 23 is supplied to the circuit 22 and an input terminal of an OR circuit 24. Then the circuit 22 delivers the read data signal and the read clock pulse signal, and these signals are fed to a computer and a read check circuit 25.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a data read/write switching system.

Conventionally, magnetic recording regeneration devices (hereinafter referred to as V
It is called MO for liiNDER. ). This VKND
The KR MO is provided with a function to record the same data on two parts of the magnetic recording medium. Two portions of a magnetic recording medium where the same data is recorded are called data areas. The data areas are provided on the gator tracks of the card as a magnetic recording medium at regular intervals in the longitudinal direction of the card.

When transferring a card having these two data areas from the second data area to the first data area in the same direction, the WINDED MC has a function that reads the data recorded in the first data area. Check whether the data was read correctly or not. If the data was read correctly, the processed data y! is stored in the second data area!
- When writing and transferring the card in the direction from the first data area to the second data area, check whether the data recorded in the second data area has been read and transferred correctly; If the data is correct, write the same footer as the data recorded in the second data area into the first data area; Data sampling/consolidation switching methods are being adopted to ensure accurate exchange of information.

By the way, in this type of data capture/write method, in order to determine the data scanning start position, a means is used to synchronize the signal generated by the microswitch with the timing clock signal. However, as is well known, micros and inch types have the problem of chattering. - To explain this using Figures 1 and 2, the card 1 as a magnetic recording medium has a data track. 2
The data track 2 is provided with a timing clock 3 and data areas 4 and 5. If the microswitch causes chattering, the writing start position 6 will not be determined, as shown in FIG. 2, and this will cause a recording error. This problem can be solved by providing a prevention circuit that prevents chattering of the micros.

There is another problem with using microswitches to determine the starting position for plowing. As the card transfer speed increases, the time when the detection terminal of the microswitch turns from OFF to OFF and the time when the detection terminal of the microswitch turns from OFF to ON become significantly different, as shown in Figure 3. - As the transport speed of the card l increases, the first
The width of the unrecorded part between the data area 4 of gg2 and the data area 5 of gg2 becomes larger, and the length in the longitudinal direction of the first and second data areas 4 and 5 becomes smaller, causing a recording error. There are drawbacks. In the third factor, reference numeral 7 indicates the writing start position when the card transport speed is high, and reference numeral 8 indicates the storage start position when the card l transport speed is low.

The present invention has been made in view of the above-mentioned problems, and a feature of the present invention is that when the magnetic recording medium is transported in the direction Cj from the rear to the first data area, the microswitch is activated. When the magnetic recording medium is transferred from the first data area to the second data area, the end position of the data area is determined by by the content, thereby detecting the first data need 9
By determining the writing start position to the first data area, the writing start position to the first data area can be determined regardless of the transport speed of the magnetic recording medium.

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

FIG. 4 is a schematic diagram of the MO for vwNDh:R applied to the data read/write switching method according to the present invention,
1 is a frame, and 10 is a guide portion thereof. The card 1 as a magnetic recording medium moves along this guide portion lO.
You will be guided into the MO for NDIAR. In the figure, arrow A indicates the insertion direction of the card 1, and here, arrow A
corresponds to the direction in which the card 1 is transferred from the second data area 5 to the second data area 4.

When ejecting the card 1, the card 1 is used to transport the card 1 in the direction from the 1st data area 4 to the second data area 5. ' The frame 9 has one protrusion 12.13 which abuts against the 74i1 end 11 of the card l and determines the insertion position of the card l.
is provided. The frame 9 includes a read head 14 for reading the timing clock 2, and a first read head 14 for reading the timing clock 2. A read/write head 15 is provided for exchanging information with the second data areas 4 and 5. In the longitudinal direction of the frame 9, an Ml microswitch 16 and a second microswitch]7 are provided, each microswitch 16, 17 having a detection terminal 18.19.

FIG. 5 shows a circuit diagram of five types of data reading and storing switching methods according to the present invention, in which the read head 14 and read/write head 15 are connected to valley waveform shaping circuits 20 and 21. . The read/write field 151] 2. The read/write field is set to a poor value before insertion, and the read data is manually input to the logic circuit 22 and the integration circuit 23 via the waveform shaping circuit 21. It has become so. Integral circuit 2
The output Ig of 3 is OR1 with the second round wI22. The latter circuit 22 is configured to output a read data signal (RDP) and a read clock pulse signal (ROP)', and these signals are input to a computer (not shown) and a read check circuit 25. It has become so.

On the other hand, the timing clock read by the read head 4 is input to the integration circuit 26 and the modulation circuit m26'. This timing clock is used as a write clock pulse. Integral circuit 2
6 is connected to the input terminal of the OR circuit 24, and the OR circuit 2
4 is adapted to output a Bj3Y signal by at least a - signal applied thereto. This B8
The Y signal has the function of indicating that the device is in use.

Micro switches 16 and 17 have switch confirmation circuit 2.
7.28 are connected respectively, and each switch confirmation circuit 27
．． ．． Reference numeral 28 indicates an L level when the microswitches 16 and 37 are on, and an H level when the microswitches 16 and 37 are off. The switch confirmation circuits 27 and 28 are connected to a card insertion/ejection detection circuit 29. Card insertion/ejection detection circuit 2
9 is connected to the read/write control circuit 3o.

The read/write control circuit 3o includes a card insertion/ejection detection circuit 29, a read check circuit 25, and a switch confirmation circuit 2.
7, and outputs a write/read select signal (WR8) to the write circuit 31.

Here, when the switch confirmation circuit 27 is at the L level and the switch confirmation circuit 28 is at the H level, the write/read select signal changes from the H level to the L level, and when the switch confirmation circuits 27 and 28 are at the same level, the write/read select signal goes from the H level to the L level. The read select signal is set to H level. 32 is a data input terminal, from which data is interspersed, and this data is input to the embedding circuit 31 via the modulation circuit 26'. There is. .

Next, the operation will be explained using FIG. 6 and the seventh floor.

(1) When card 1 is in the inserted state.

When the microswitches 16 and 17 are off, the switch confirmation circuits 27 and 28 are at the H level, as shown in the sixth factor, and when the front end 11 of the card 1 comes into contact with the microswitch 16, the switch confirmation circuit 27 is at the L level. level, and then the Mjl end of card J comes into contact with micro switch ]7, and switch blIA recognition 1 path 28 becomes LL/belt. This is shown in (a) and (b) of FIG. This shows the level facilitation of FIG. 6. When the switch confirmation circuit 27 changes from H level to L level and there is a signal indicating that the card is being inserted from the card insertion/ejection detection circuit 29, each write/read select number changes from H level to L level, and the switch confirmation circuit 28 changes from H level to L level. When the level changes from the H level to the L level, the wait/read sector signal changes from the L level to the H level. G/9 in FIG. 6 indicates the level change of the write/read sector signal. G/9 in FIG. 6 indicates the write clock pulse read by the read head 14.

Until the switch confirmation circuit 27 changes from the H level to the L level, the router recorded in the first data area of the card I is read. (f) in FIG. 6 shows this state. First, the data has a "103" pit configuration, with bits "1#" consecutively preceding and following it, and bits "0#" consecutively following the "1" bit. This data is manually inputted to the read check circuit 25 as a read data signal.The sixth item, F, indicates a read clock pulse signal, and is inputted manually to the read check circuit 25. The read check circuit 25 sends an output signal to the read control circuit 30 by switching the data bit l" to bit "0". Since the card is being inserted, the write/read sector number is at H level. The switch confirmation circuit 27 goes to L level, and the card insertion/ejection detection circuit 29 outputs a signal indicating that the card is being inserted, and the light/9-
The de-select signal goes to L level, the convolution circuit 31 is activated, and the processed data is recorded in the second data area 5 of the card I by data input from the data input terminal 32. ((E) in FIG. 6 shows the state in which processed data is recorded by this write circuit 31. In addition, 4) in FIG. 6 indicates the level change of B8Y. The inside is at L level. When the micro switch 17 is turned on, the switch confirmation circuit 28
becomes L level, the ride read select signal becomes H level, and the write circuit 31 enters the read state.

(2) When card l is in the ejected state.

When the card comes into contact with the protrusions 12 and 13, the microswitches 16 and 17 are both turned on.

When the card I is ejected from this state, the microswitch 17 is first turned off, and then the microswitch 16 is turned off. (A) in FIG. 7 shows a level change in the switch confirmation circuit 27, and (B) in FIG. After reaching the H level, W&27 changes from the L level to the H level at the switch confirmation time.

As the switch confirmation circuit 28 changes from the L level to the H level, four lead clocks and a signal are output as shown in (g) of FIG. 7, and as shown in (f) of FIG.
The data recorded in the data area 5 of is read. The write select signal shown in FIG. As a result, the level changes from the H level to the L level, and the write circuit 31 is switched from the read state to the write state.
As shown in (e) of FIG. 7, the same data as the data recorded in the second data area 5 is recorded in the first data area 4.

As explained above, the present invention detects the content of the data recorded in the S second data area and switches the recording to the il data area, so the hunting recording medium is transferred. This has the effect that the writing start position can be determined regardless of the speed.

[Brief explanation of drawings]

FIG. 1 is a plan view of a general card, FIG. 2 is an enlarged view thereof, FIG. 3 is an explanation of the recording state when the card transfer speed is different, and FIG. 4 is a diagram of an MO for VENDER according to the present invention. A schematic configuration diagram, FIG. 5 is a block circuit diagram thereof, FIG. 6 is a time chart diagram when the card is inserted, and FIG. 7 is a time chart diagram when the card is ejected. ]...Card 2...Data track 4...First data area 5...Second data area 11...End face 15...Read fist

Claims (1)

[Claims] (1) A magnetic recording medium is used in which a first data area and a second data area are provided at intervals in the longitudinal direction of the data track, and the magnetic recording medium is When transferring in the direction from the second data area to the first data area, the data recorded in the first data area is read and then the processed data is written in the second data area. When transferring a magnetic recording medium from a first data area to a second data area in the same direction. After reading the data recorded in the second data area, the same data as the data recorded in the second data area is stored in the first data area. In the write switching method, when the magnetic recording medium is transferred from the second data area to the first data area in the same direction, a switch means is turned on and off by detecting an end face of the magnetic recording medium. is used to determine the storage start position of the data to the second data area, and when the magnetic recording medium is transferred from the i@l data area to the second data area in Section 6II in the same direction. , the end position of the second data area is detected based on the contents of the read data, and the same data as the data recorded in the second data area is written in the first data area. A switching method for reading and writing data.