JPH0442751B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a data reading/writing switching method.

Conventionally, there have been magnetic recording and reproducing devices for vending machines (hereinafter referred to as MC for VENDER). this
The MC for Vender is equipped with a function to record the same data on two parts of the magnetic recording medium owned and used by the user. Two portions of a magnetic recording medium where the same data is recorded are called data areas. The data areas are provided at regular intervals in the longitudinal direction of the data track of the card as a magnetic recording medium. In the process of inserting this card into the Vender MC, the data recorded in the first data area is read to check whether the data was read correctly or not. In this case, the processed data is written in the second data area, and in the process of pulling the card back in the opposite direction, the data recorded in the second data area is read to check whether the data was read correctly. However, when the data is read correctly, the same data recorded in the second data area is written to the first data area, so that information can be exchanged accurately. Data read/write switching methods are being adopted.

By the way, in this type of data reading/writing method, in order to determine the data writing start position, a means of synchronizing the signal generated by the microswitch and the timing clock signal is adopted. Microswitches have the problem of chattering. This is the first
2, a card 1 as a magnetic recording medium has a data track 2, and the data track 2 has a timing clock 3.
and data areas 4 and 5 are provided. When the microswitch causes chattering, the write start position 6 changes each time, as shown in FIG. 2, and the length to accommodate the data cannot be secured, causing a recording error. This problem can be solved by providing a prevention circuit that prevents the microswitch from chattering.

There is another problem with determining the writing start position using a microswitch. For example, if the card transfer speed increases, the time it takes for the detection terminal of the microswitch to turn from on to off or from off to on remains almost constant, even if the card transfer speed increases. As shown in , as the transport speed of the card 1 increases, the width of the unrecorded area between the first data area 4 and the second data area 5 increases, and the first and second data There is a drawback that the lengths in the longitudinal direction of areas 4 and 5 are reduced, resulting in recording errors. In FIG. 3, the reference numeral 7 indicates the start position for writing when the card transport speed is high, and the reference numeral 8 indicates the start position for writing when the card 1 transport speed is low.

The present invention has been made in view of the above-mentioned problems, and the feature of the present invention is that the magnetic recording medium is transferred from the second data area to the first data area (direction of arrow A in FIG. 4). When moving the magnetic recording medium from the first data area to the second data area, the micro switch starts writing to the second data area. Detects the read start mark, starts writing to the first data area based on the detected signal, and determines the writing start position to the first data area regardless of the transport speed of the magnetic recording medium. The reason lies in the fact that we have made it possible.

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

FIG. 4 is a schematic diagram of a VENDER MC applied to the data read/write switching system according to the present invention, where 9 is a frame and 10 is a guide portion thereof. A card 1 as a magnetic recording medium is guided into the Vender MC along this guide section 10. In the figure, arrow A indicates the direction of insertion of the card 1. Here, arrow A indicates the insertion direction of the card 1 from the second data area 5 to the first data area 4.
This corresponds to the direction of transport. When ejecting the card 1, the card 1 is transferred in the direction from the first data area 4 to the second data area 5.

The frame 9 has a protrusion 1 that abuts the front end 11 of the card 1 to determine the insertion position of the card 1.
2 and 13 are provided. The frame 9 is provided with a read head 14 for reading the timing clock 2 and a read/write head 15 for exchanging information between the first and second data areas 4 and 5. A first microswitch 16 and a second microswitch 17 are provided in the longitudinal direction of the frame 9, and each microswitch 16, 17 has a detection terminal 18, 19.

FIG. 5 shows a circuit diagram of a data read/write switching system according to the present invention, in which a read head 14 and a read/write head 15 are connected to waveform shaping circuits 20 and 21, respectively. The read/write head 15 is set in a read state before the card is inserted, and read data is input to a demodulation circuit 22 and an integration circuit 23 via a waveform shaping circuit 21. The output signal of the integrating circuit 23 is input to the demodulating circuit 22 and one input terminal of the OR circuit 24. Demodulation circuit 2
2 outputs a read data signal (RDP) and a read clock pulse signal (RCP), and these signals are input to a computer (not shown) and a read check circuit 25. It's summery.

On the other hand, the timing clock read by the read head 14 is sent to the integrating circuit 26 and the modulating circuit 2.
6'. This timing clock is used as a write clock pulse. The integrating circuit 26 is connected to the other input terminal of the OR circuit 24, and the OR circuit 24 outputs a BSY signal in response to at least one signal input thereto. This BSY signal is
It has a function to indicate that this device is in use.

Switch confirmation circuits 27 and 28 are connected to the micro switches 16 and 17, respectively.
When 6 and 17 are on, the level is L, and when they are off, the level is H. This switch confirmation circuit 2
7 and 28 are connected to a card insertion/ejection detection circuit 29. The card insertion/ejection detection circuit 29 is connected to a read/write control circuit 30.

The read/write control circuit 30 controls the card insertion and
It is controlled by a discharge detection circuit 29, a read check circuit 25, and a switch confirmation circuit 27, and a write/read select signal (WRS).
is output to the write circuit 31.

Here, the switch confirmation circuit 27 is at L level,
When the switch confirmation circuit 28 is at H level, the write/read select signal goes from H level to L level, and both switch confirmation circuits 27 and 28 are at L level.
When the level is high, the write/read select signal is H.
It is made to be a level. Reference numeral 32 denotes a data input terminal from which data is taken in, and this data is input to the write circuit 31 via the modulation circuit 26'. Furthermore, the data used in the embodiment is provided with a start mark and an end mark, as will be described later.

Next, the operation will be explained using FIGS. 6 and 7.

(1) When card 1 is inserted.

When the micro switches 16 and 17 are off, the switch confirmation circuits 27 and 28 are activated as shown in FIG.
is at the H level, and when the front end 11 of the card 1 comes into contact with the micro switch 16, the switch confirmation circuit 27 becomes the L level, and then when the front end of the card 1 comes into contact with the micro switch 17, the switch confirmation circuit 28 becomes the L level. level. this,
Shown in A and B of Figure 6. A in FIG. 6 shows a level change in the switch confirmation circuit 27, and B in FIG. 6 shows a level change in the switch confirmation circuit 28. 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, the write/read select signal changes from H level to L level, and the switch confirmation circuit 28 changes from H level to L level. From H level to L
When the level is reached, the write/read select signal changes from L level to H level. 6 shows the level change of the write/read select signal. FIG. 6D shows the write clock pulse read by the read head 14.

The data recorded in the first data area of the card 1 is read until the switch confirmation circuit 27 changes from the H level to the L level. F in FIG. 6 shows this state. Here, the data has a "103" bit structure, and the first and last parts of this data are made up of a predetermined number of consecutive bits "1" (start mark and end mark), and other than the data are bits. It is set to “0”. This data is input to the read check circuit 25 as a read data signal. 6 shows a read clock pulse signal, which is input to the read check circuit 25. In FIG. The read check circuit 25 sends an output signal to the read control circuit 30 by reading a bit "0" after reading a predetermined number of bits "1" of the data, but since the card is being inserted, no write is possible. - The read select signal remains at H level. When the switch confirmation circuit 27 becomes L level and the card insertion/ejection detection circuit 29 outputs a signal indicating that the card is being inserted, the write/read select signal becomes L level, the write circuit 31 is activated, and the data input terminal 32 is output. Processed data is recorded in the second data area 5 of the card 1 by data input from the card 1. 6 shows a state in which data processed by the write circuit 31 is recorded. Note that the symbol H in FIG. 6 indicates the level change of BSY, which is at L level during operation.
When the micro switch 17 is turned on, the switch confirmation circuit 28 goes low, the write/read select signal goes high, and the write circuit 31 goes into the read state.

(2) When card 1 is in the ejected state.

When the card comes into contact with the protrusions 12 and 13, the micro switches 16 and 17 are both turned on. When the card 1 is ejected from this state, the micro switch 17 is first turned off, and then the micro switch 16 is turned off. A in FIG. 7 shows a level change in the switch confirmation circuit 27, and B in FIG. After getting old, switch confirmation circuit 27
changes from L level to H level. When the switch confirmation circuit 28 changes from L level to H level, a read clock pulse is output as shown in 7 in FIG. 7, and the data is recorded in the second data area 5 as shown in 7 in FIG. data is read.
The write select signal shown in FIG. 7C is a signal that reads bit "0" after reading a predetermined number of data bits "1" and that the card insertion/ejection detection circuit 29 is in the process of ejecting the card. By outputting , 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. Based on this changed signal, 0 is set to 25 by the write clock pulse as shown in Fig. 7 (E).
After the bits are recorded, in the first data area 4,
The same data as that recorded in the second data area 5 is recorded.

The present invention uses a switch means when reading data in the first data area 4 and writing newly processed data to the second data area 5, so that the first data area 4 is not used. Even if there is a problem, writing can be performed in the second data area 5 from a predetermined position, and when writing data in the second data area 5 to the first data area 4,
By reading the start mark written in the second data area 5, data is written at appropriate intervals based on the read signal, so the data is not affected by the card transfer speed. The writing position of the card can be made stable, and the reliability of the card can be increased.

[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 explanatory diagram of the recording state when the card transfer speed is different, and Fig. 4 is a diagram according to the present invention.
A schematic configuration diagram of the MC for VENDER, Fig. 5 is its block circuit diagram, Fig. 6 is a time chart when the card is inserted, and Fig. 7 is a time chart when the card is ejected. 1... Card, 2... Data track, 4...
1st data area, 5... second data area, 11... end face, 15... read/write head, 16, 17... micro switch.

Claims (1)

[Claims] 1. A magnetic recording medium in which a first data area and a second data area are provided at intervals in the longitudinal direction of the data track is used; When transferring the recording medium in the direction from the second data area to the first data area, after reading the data recorded in the first data area, writing the processed data in the second data area, When the magnetic recording medium is transferred from the first data area to the second data area, after reading the data recorded in the second data area, the second data area is transferred to the first data area. A data read/write switching method for writing the same data as data recorded in a data area of the magnetic recording medium, the magnetic recording medium being directed from the second data area to the first data area. When transferring the magnetic recording medium in the direction, data is written in the second data area by detecting the end face of the magnetic recording medium using an on/off switch means, and the magnetic recording medium is transferred from the first data area. When transferring in the direction toward the second data area, a start mark in the data of the second data area is read, and based on the read signal, transfer is performed from the first data area to the second data area. A data read/write switching method that writes the same data as the recorded data.