JPS59117712A - Reading system of magnetic data - Google Patents

Abstract

PURPOSE:To attain self-diagnosis of a failure in a reading element by connecting at least one reading element to a write circuit, generating an exciting change in the reading element and checking a crosstalk output produced in other reading elements. CONSTITUTION:Write drivers 331, 332 are operated according to a write signal obtained from a write signal generating circuit 38 controlled by a CPU37 via a data bus 36 and connected to any reading element among reading elements 161- 168 by the control of control signals C1-C8. A crosstalk output generated in the other reading elements is read by giving an excitation change to the reading element, and if a reading data by th crosstalk output is not obtained from the reading elements in the vicinity regardless of the giving of excitation change, the self-diagnosis is attained where it is discriminated as a failure in the reading element or the reading circuit. As a result, a failure in the reading element is checked quickly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for reading magnetic data in a ticket processing device that processes tickets, such as an automatic ticket gate used in railways.

[Technical background of the invention and its problems]

In recent years, for example, in the railway industry, automatic ticket gates have become widespread with the aim of saving labor at station operations. Conventional automatic ticket gates allow regular tickets (hereinafter referred to as "regular tickets") with a boarding date, departure station, and section decided on, and tickets with a fixed boarding date, departure station, and section (hereinafter referred to as "regular ticket"), and tickets with a boarding date, departure station, and section determined within a fixed period of time. There are two types of commuter passes (hereinafter referred to as commuter passes) that allow you to get on and off as many times as you want.These tickets have pattern data printed on the surface that can be recognized by humans. In addition, the design/code data is magnetically recorded in the drawing so that the machine can recognize it.
ing.

By the way, in general, the majority of ticket gate operations in the railway industry involve the processing of ordinary tickets and commuter passes, but in addition to this, there is also the processing of coupon tickets (hereinafter referred to as coupon tickets), and automation of this processing is not possible. This has been a long-standing issue, and has only recently been developed and put into practical use. A coupon ticket is a ticket that can be used at any station at the time of sale, has a fixed section, and is valid for a certain period of time from the date of issue, and is generally the same size as a regular ticket.

In automatic ticket gates that process such tickets,
By reading the magnetic data of the ticket inserted by the passenger with a reading head (@ki head), it is determined whether or not the ticket is a valid ticket, and if the ticket is determined to be valid, the passenger can board the ticket. Tickets are released with station data and usage date data included. In this case, if an abnormality occurs in the reading head or the reading circuit, such as a broken wire in the reading head coil or a failure in the reading circuit, and the function deteriorates, accurate data reading may become impossible. The number of tickets that are judged to be invalid is increasing. However, this phenomenon of judgment abnormality has become quite frequent, and it may be difficult to determine whether it is an abnormality in the reading system, the passenger, or the person who inserted the ticket. Yes, it will cause inconvenience to passengers.

[Purpose of the invention]

The present invention was developed in view of the above circumstances, and its purpose is to quickly check for abnormalities in the reading system, and to prevent customers from being inconvenienced by a valid ticket being determined to be an invalid ticket. It is an object of the present invention to provide a method for reading magnetic data.

[Summary of the invention]

The magnetic data reading method according to the present invention provides a plurality of reading elements in the same magnetic head to read magnetic data ffi.
In the case where at least one reading element is connected to the writing circuit, an excitation change is generated in that reading element, and all crosstalk outputs occurring in other reading elements are checked. This allows self-diagnosis to determine whether there is any abnormality.

[Embodiments of the invention]

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

FIG. 1 shows a mechanical section of an automatic ticket gate apparatus which also performs all processing of coupon tickets according to the present invention. That is, 1 is a main body of the apparatus, and an input port 2 is provided at the right end of the top surface of the main body 1, and an outlet port 3 is provided at the left end. Between the input port 2 and the discharge port 3, there is an alignment conveyance path 4, a main conveyance path 5,
A discharge conveyance path 6 is provided in series. In addition, between the communication part between the main conveyance path 5 and the discharge conveyance path 6 and the ticket collection stocker 7, a ticket collection conveyance path 9 is provided via a ticket collection flap 8 that divides nine tickets into ticket gates and ticket collections. Set aside. Then, the t'1. The tickets are guided to the alignment conveyance path 4, where they are aligned in the longitudinal direction, conveyed, and transferred to the n1 main conveyance path 5. The main conveyance path 5 conveys the aligned ticket to its terminal end. If the ticket to be conveyed is a ticket ticket, the ticket collection flap 8 guides the ticket to the discharge conveyance path 6 and to the discharge port 3.

-1 liter, when the above-mentioned conveyed tickets are collected in a ticket collection, the ticket collection flap 8 guides the tickets t' to the collection conveyance path 9;
It leads to the bill stocker 7.

In the main conveyance path 5, there is a first magnetic head (reading head) 1 ('tp 10sp) which reads the magnetically encoded data+a from the ticket along the conveyance surface. Second magnetic head (read/write head) llxrll to write new data
x, print heads 121 and 122 that print the boarding station name, boarding date, etc. on the surface of the ticket; this print head 121;
Printing pad 131 facing e122 and fixing the position of the ticket 13 Snow, punch 741.14 to be inserted into the ticket
2. Koo Bunch 141, 14. A stopper 151 for fixing the ticket facing the VC. I 5. are provided respectively n
Ru. Above 1. Second magnetic head 101, 10. , 11
1, 11. As shown in FIGS. 2 and 3, a well-known 8-track magnetic head is used. This conforms to the encoding format for regular tickets and commuter passes specified by the Japan Cybernetics Association standards. FIG. 2 shows the first magnetic head 101.10z, which consists of eight tracks of reading elements 161-168.

FIG. 3 shows the second magnetic head 111 and 112.
4-track read/write element 17. 174 and write elements 175 to 17s for four tracks. Further, the print heads 121, 12 . As shown in FIG. 4, it consists of a station name printing section 18 and a date printing section 19, and is applied to the front side of the n,'i group, and printed on the printing pad 131 from the back side.

132 and heat-sensitive color development. In addition, the above 1. Second magnetic head 101
*111, print head 122%, print pad 132, bunch 142, and stopper 152 are used when the ticket is inserted with its surface facing up. Second magnetic head 102.11? , print head 121, print bud 1
31, bunch 141, and stopper 151 are used when the ticket is inserted with its surface facing down.

Returning to FIG. 1, the insertion slot 2 is provided with an insertion detector 20 for detecting an inserted ticket. Further, a size identification detector 21 is provided at the starting end of the alignment conveyance path 4. This detector 21 is used together with the insertion detector 20 to identify whether the inserted ticket is regular ticket size or commuter pass size. Further, a pre-reading detector 22 is provided in front of the first magnetic head 1OLp102 on the main transport path 5, and a reading photodetector 23 is provided in front of the n% second magnetic head '11m11B. Further, the discharge port 3 is provided with a discharge detector 24 . Further, a bill collection detector 25 is provided on the bill collection transportation path 9.These detectors 20
~25 is an optical device consisting of a light emitting diode and a phototransistor, and conveys the inserted ticket.
It is used to read, swipe, print, punch, collect, and track tickets.

FIG. 5 shows the above-mentioned 1. Second magnetic head 10. .

102 shows a reading circuit to which n is connected.

That is, each reading element 161-16. are connected to amplifiers 321 to 321 by connection changeover switches (relays) 311 to 318.
328 or write driver (NPN transistor) 3
31, 33. selectively connected to n. The connection changeover switches 311 to 31m are controlled by control signals C1 to C8, respectively. Therefore, each reading element 161~
16. The read data obtained from the intensifier IIIPi unit 32
1-32. After being amplified and digitized, the data is set in the FF circuits 341 to 34a and read out by the CPU (central processing unit 37) via the gate circuit 35 and data bus 36. CPU 3
7 is operated by the program, FF circuit 341~
34. When read data is read from the clear signal CLI, the FF' circuits 341 to 34B are cleared in preparation for setting the next read data. On the other hand, write drivers 331.33. The rt/b input signal generation circuit 38 is controlled by the CPU 37 via the data bus 36.
It operates according to the write signal n obtained from the control signal C1.
- Valley reading element 16 under the control of C8. ~168 is connected to any one reading element, and by applying an excitation change to this reading element, the crosstalk output generated in other reading elements can be read. Regardless, the configuration is such that self-diagnosis can be performed to determine that the reading element or reading circuit is malfunctioning when no read data is obtained from the cyclotalk output from a total of one reading element in the vicinity.

FIG. 6 shows that the second magnetic heads 111 and 112 are connected.
This figure shows the write circuit. That is, the reading/writing elements 17t p 172 r 173 are the reading elements 171,
-R, 172-Rr17g-R and 1-piece element 171-W
+ 172- W t 17 s - The n5 read/write element 173 is configured in combination with the read element 773-H.
Used only. Therefore, each reading element 171-R, 1
72-R, 17, -R are respectively n amplifiers 391, 39
Connect to 2p393. For your convenience, each reading element 17
The read data obtained from 1-R*17t-R+17s-R is amplified and digitized by amplifiers 391, 392, 393, and then sent to FF circuits 408, 40.
2°403, n5 gate circuit 44 and data bus 45'? It is read by the CPU 46 via n.

The CPU 46 operates according to the program, and FFL
When the read data is read from the paths 40□-403, the clear signal CL clears the FF circuits 401-403 in preparation for setting the next read data. On the other hand, each write element 17°-W, 172-W+17s+17
11r171 is the n-shaped driver (N, PN type transistor) 471 r 472 +' 81 r
' 82 p 491 p 49 z H5θ1 t
50H+ 511 Connected to r512. However,
Write driver 471°472-51. ．． 512 operates in accordance with the key input signal obtained from the write signal generation circuit 52 controlled by the CPU 46 via the data bus 45, and inputs the encoded data into the inbound ticket. When writing encoded data to a coupon ticket, read the timing track of the coupon ticket Jl! The reading is performed by the reading element 171-R or 17N-R depending on the direction in which the coupon is inserted.

When the read element 171-H reads a synchronization pulse from the timing track, the write element 17.H is read in synchronization with the synchronization pulse. -W, 17. Write encoded data to the multi-data track.

Furthermore, when the read element 172-H reads the synchronization pulse from the timing track, the write element 171-Wp17g writes encoded data to the multi-data track in synchronization with the synchronization pulse. On the other hand, when writing encoded data on a commuter pass, the timing track of the commuter pass is read by the reading element 172-R or 173-R, depending on the direction in which the commuter pass is inserted. Reading element 1
72-R reads the synchronization pulse from the timing track, the write element 17 is read in synchronization with the synchronization pulse.
6.17. Write encoded data to the multi-data track. (9) When the read element 173-H reads all the synchronization pulses from the timing trunk, the write element 176-17 similarly writes the encoded data. Note that the CPU 46 in this circuit may be shared with the CPU 37'i in the circuit of FIG. 5, or may be a separate unit.

FIG. 7 is an operational processing flowchart for explaining the quick processing for reading coupon tickets. That is, when a 2"L coupon inserted from the input slot 2 is conveyed and reaches the pre-read detector 22, it is connected to the first magnetic head 101 or 102.
The magnetically encoded data of the coupon ticket is read by the reading circuit shown in FIG. 5 to the CPU 37. CPU 37F
i, determine whether the period and section are valid or invalid based on the read data, and if the determination result is valid, n, the second magnetic head 11. Alternatively, by operating the writing circuit shown in FIG. Since "'C writing is performed in synchronization with the n synchronization pulses read from the data track of the coupon ticket ゎ:f"L;E), the number of synchronization pulses required to write all the data must be read. Since there is no coupon ticket or second magnetic head 11. or 11. If it passes through the photodetector 23 and reaches the reading photodetector 23, the CPU 46 determines that there is a write (rewrite) failure and activates the alarm device (not shown). Since the encoded data is not properly encoded, the ticket is treated as invalid even though the determination result is valid, and the door (not shown) is completely closed to prevent the passenger who inserted the ticket from passing.

In this case, by presenting the ticket to the staff member, the passenger can receive appropriate treatment such as exchanging it for a non-normal ticket or being guided by the staff member.
When getting off the train, the ticket is placed in the automatic ticket gate on the ticket collection side (3%) to prevent problems from occurring. 9. When a ticket with defective data writing is presented to the clerk, in order to distinguish it from processing invalid tickets due to reuse, even if the judgment result is valid, the ticket is not printed or punched, and is treated as if it were invalid. The process is the same as when the magnetic data disappears outside the vehicle and the n1 invalid red judgment is performed. This is because once used tickets are printed and punched in a way that they can be visually identified, if the tickets are inserted into the automatic ticket gate at the ticket gate again, they will become invalid. If the ticket is judged to be a ticket, the staff will judge it to be reused if it is printed and punched. For this reason, printing and punching are not performed on tickets with bad writing, making it easier for staff to judge whether the ticket is a reusable ticket or a ticket with bad writing.

FIG. 8 is an operational processing flowchart for explaining the processing of printing and inserting a ticket.

That is, for example, for a ticket inserted with the printed side facing down, the stopper 151tl is operated to stop the ticket on the conveying surface, and the print head 121 and print pad 131 are moved to a press (not shown). When actuated by a solenoid, the ticket is compressed between them.

As described above, the print head 121 includes the station name printing section 18 and the date printing section 19, and prints by thermally developing color. For this reason, if pressure cannot be applied between the off-vehicle print head 121 and the print pad 131 due to a malfunction of the press solenoid, normal printing will not be performed.

Therefore, in the present invention, by providing an operation detection means for detecting whether or not the press solenoid has sufficiently operated,
In the case of a malfunction, even if the judgment result of the read data of the ticket is valid, it is assumed that there is a printing malfunction and an alarm (not shown) is activated, the door (not shown) is closed, and the ticket is inserted. to prevent passengers from passing through. This is because the rewriting of the magnetic data on the ticket is completed before the printing process, and the rewritten magnetic data is the ward station order code and ward number data of the boarding station where the ticket was inserted. The train is structured in a multi-layered structure, specifying all sections where you can get off the train, centering on the boarding station. However, if a passenger uses this ticket for the purpose of getting off outside the section, the automatic ticket gate at the exit station's collection side will treat it as an invalid ticket, but the staff will check if the ticket is visually defective at the boarding station. This is because I do not understand why Jin's ticket was treated as invalid, and I will fully support him in the payment process and other tasks.

FIG. 9 is a simplified diagram for explaining the encoded data write driver and read circuit. That is,
One end of the write element WL is connected to the collector of an NPN transistor Q1 and connected to the positive power supply +V via a resistor R1.The other end of the write element WL is connected to the collector of an NPN transistor Qs and connected to a resistor R1. It is connected to the power supply +V via R1. Moreover, the above transistor Qr-Q
Each emitter of g is grounded. However, N.R.
When encoded data is written using the Zl method, a timing chart as shown in FIG. 10 (-) is obtained.

This is transistor Q1. By turning Qs on and off so that each output changes simultaneously in different polarity directions, the excitation state of write element WL is reversed and data "1" is written. (6) When writing data, transistor Q1. This is achieved by not changing the state of Qs, and by not inverting the excitation state. When the excitation state is inverted, crosstalk output due to leakage magnetic flux occurs in the reading element RL.
The signal is input to the amplifier AP. The crosstalk output t input to the amplifier AP is shown in FIG. 10(a). Since this crosstalk output occurs only when the excitation state of the write element WL is reversed, it is necessary to operate the write circuit and check whether the write circuit and read circuit operate normally. In principle, it is possible to perform self-diagnosis based on the presence or absence of talk output.

By the way, timing charts in FIGS. 10(b) and 10(c) show a case where the transistor Q1 or Q8 of the write circuit fails or is short-circuited and the transistor does not operate.

As is clear from the figure, even if one of the transistors is out of order, a crosstalk output that is approximately half that of a normal transistor is generated. This is because the crosstalk output occurs not only when the excitation state is reversed, but also at the point where the excitation turns on and off. It is not possible to detect whether or not it is operating normally. Therefore, in the present invention, the transistor Q1-Qgejf! In addition to operating as shown in FIG. 11(a), self-diagnosis of the write circuit and read circuit is performed depending on the presence or absence of crosstalk output at that time. In FIG. 11 (-), when the output of one transistor is changed, the output of the other transistor is not changed. With this method, if a crosstalk output due to the influence of only the side whose output is changed is obtained and no crosstalk output is obtained, it is possible to reliably detect which transistor is faulty. An example of self-diagnosis using this method is shown in FIG. 11(b).

Shown in (C). Figure 11(b) shows the transistor Q
This is an example in which transistor Q2 does not operate due to a failure, and it is possible to self-diagnose that transistor Q2 has a failure by not obtaining a crosstalk output from P2. Figure 11 (C) is an example in which the transistor Q) does not operate due to a failure.
You can self-diagnose that there is a malfunction. In addition, Fig. 11 (a
), during self-diagnosis, current is passed through the transistor (write dry puff) to energize the write element, so if the ticket passes through the magnetic head during self-diagnosis,
Damage the magnetic data on the ticket. Therefore, it is necessary to perform control so that the self-diagnosis is performed only when the ticket has not passed through the magnetic head.

FIG. 12 is an operational processing flowchart for explaining the self-diagnosis processing. That is, when a ticket is not inserted, a complete self-diagnosis of the failure of the write circuit shown in FIG. 6 connected to the second magnetic head 1'xp 112 is carried out. As a result of the self-diagnosis, if there is no failure in the write circuit, a self-diagnosis of the first magnetic head 1101plO and the reading circuit shown in FIG. 5 connected thereto is performed. If a failure is detected as a result of the self-diagnosis of the writing circuit and reading circuit, the shutter of the input port 2 (not shown) will be closed, the alarm (not shown) will be activated,
It prevents people from inserting tickets. 'When a JTS ticket is inserted, the above-mentioned self-diagnosis of the writing circuit and reading circuit is performed between the time when the entry detector 20 detects that the passenger is not boarding and the time when the ticket reaches the pre-read detector 22. If # all tickets are detected in the read N path, no determination is made as to whether the tickets are valid or invalid outside of the ride based on magnetic data reading, and all tickets are treated as valid tickets. If a failure is detected in the write circuit, no write operation is performed on the inserted NFC ticket.

In addition to detecting failures through self-diagnosis, the present invention also provides a determination off switch (not shown) that is operated when there is a possibility of a malfunction in the ticket reading determination process, based on the judgment of the staff member. When the determination is set to OFF, all inserted tickets are treated as valid tickets, but the magnetic data is not rewritten or printed. This is because the content of the magnetic data to be rewritten changes depending on the determination result, and this is to prevent incorrect rewriting and printing of magnetic data.

Further, magnetic data is read by the first magnetic head 101 or 10. Whether or not the data was read correctly is determined by checking the 7 (Return 2) bit on the ticket. If it is determined that there is a magnetic data, rewriting and printing of the magnetic data in the second magnetic head 111 or 112 is not performed. The reason for not doing so is the same.

FIG. 13 shows the encoding format 9u of Futong Hata according to the Japan Science Networks Council standard. As shown in the figure, the first track (data track) 58 contains the company's own line data, the second track (data track) 59 contains 1% of the other company's line data, and the synchronization pulse (clock pulse).
y')" 8 self-recorded fljCPl-rack (timing track) 60.Then, the first track 58 contains direction discrimination data 6 monthly data 62.10th F data 63.1st daily data 64 , line section data 65, station order data 66, number of sections 7, communication bit 68, ticket type bit b9, reservation 1m bit 70, and parity bit 71 are provided.Furthermore, in the second track 59, All white bit 72, line section data 73, station 1 data 74, section number data 75, all white bit 76, and parity bit 77 are provided 71.

A coupon ticket is created using this encoded format for a regular ticket, and the format is as shown in FIG. The format of the coupon ticket is different from the regular ticket,
Month data 62, effective end month data 7B, 10th place day de~
ri63, 10th place valid end date data 79.1st place date~
1st place valid end date data 80% line section data 65
The coupon code 81. indicates that it is a coupon ticket. The type data 82 for the number of times is written in the station order data 66.In other words, it is not known which station the train will board from on which day of the month until the ticket gate is passed through the ticket gate. The front of the ticket encoded in the format is the first
As shown in Figure 5 (-), the ticket is printed, and as is clear from this figure, the name and date of boarding are not printed on the ticket.

Next, the operation when the above-mentioned coupon ticket is inserted into the automatic ticket gate shown in FIG. 1 will be explained. When the coupon tickets shown in FIG. 14(a) and FIG. 15(-) are inserted into the slot 2, they are aligned in the longitudinal direction by the aligning conveyance path 4 and conveyed to the main It is sent to the conveyance path 5. The validity or invalidity of the coupon ticket sent to the main transport path 5 is determined by reading the magnetic/code data shown in FIG. 14 (-) by the first magnetic head 101 or 10°.

The ticket that is determined to be valid is then sent to the second magnetic head '11.
Reach +112. Second magnetic head 111 or 1
1. Then, the reading/writing element 171 reads the synchronizing pulse from the CP rack 6θ on the coupon ticket, and in synchronization with the synchronizing pulse, the direction discrimination data 61 is written to the first track 58 as shown in FIG. Write in the date of use data 92, 93, 94, boarding station line section data 95, station JlliN data 96.1, number of wards data 67, ticket type bit 69, and if there is a connection with another company, write the 1 track 58 contact bit 68. 2nd) Contact Rack 59 II<;i Urine section data 73, station order data 74, number of other line sections Cheetah 5? That's it.
Write, then parity ping) 77.77! cl included.

The encoding shown in FIG. 14(b) conforms to the non-ordinary code for close range of the Japan Cybernetics Council standard shown in FIG. 13. Therefore, the second magnetic head 1
11 or 11. The encoded data in FIG. 14(b) is converted into 1. If the ticket contains a ticket, please use the stopper 151 or 15.
Stopped at 2, punch 141 or 14! Punch (
At the same time, the printing head 121 and printing band 1
31 or print head 12. The boarding station name and date of use are printed on the printing pad 132, resulting in a coupon ticket as shown in FIG. 15(b). Then, the number of times other than this is ejected from the ejection port 3.

In the above embodiment, the magnetic data C'(r) is read by stamping it on the ticket, but the present invention is not limited to this.
The present invention is not limited to this, and can be similarly applied to, for example, reading magnetic data from a magnetic card.

〔Effect of the invention〕

As described in detail above, according to the present invention, in a device in which a plurality of reading elements are provided in the same magnetic head to read random data, at least one reading element is connected to the writing circuit. generate an excitation change in the reading element,
By checking the crosstalk output generated in other reading elements and self-diagnosing whether there are any abnormalities in the reading system, it is possible to quickly check for abnormalities in the reading system, and it is possible to quickly check for abnormalities in the reading system. It is possible to provide a magnetic data reading method that does not cause trouble.

[BRIEF DESCRIPTION OF THE DRAWINGS] The figures are for explaining one embodiment of the present invention, and FIG. 1 is a side view schematically showing the mechanism of an automatic ticket gate, and FIGS. 2 and 3 are magnetic FIG. 4 is a plan view showing the printing surface of the print head, FIG. 5 is a configuration diagram of the reading circuit, FIG. 6 is a configuration diagram of the writing circuit, and FIG. 7 is a coupon ticket. Figure 8 is a flowchart of operation processing to explain the entire process of printing and inserting tickets, Figure 9 is a timing chart of the writing driver and reading circuit. Fig. 12 is an operation processing flowchart to explain the self-diagnosis processing of the writing circuit and reading circuit, Fig. 13 is a diagram showing an example of the encoding format of a regular ticket, and Fig. 14 is an example of the encoding format of a coupon ticket. The figure shown in FIG. 15 is a diagram showing an example of the surface printing pattern of the coupon ticket. 2... Input port, 3... Discharge port, 4... Arrangement wrinkle feed path, 5... Main conveyance path, 6... Discharge conveyance path, 9... Bill collection conveyance path, 101 , 102... first magnetic head (reading head), 111, 172... second magnetic head (anti-plate writing head), 161-16. ...Reading element, 171
~174...Reading/writing processing, 17Ii~178...
Write element, 58...first track (data track), 59...second track (data track), 60.
...CP) rack (timing track). Applicant's representative Patent attorney Takehiko Suzue Figure 8 Figure 9 Figure 10 AP/+ input AP input Figure 11 Figure 13 Figure 14 (a) (b) Figure 15 (a) (b)

Claims (1)

[Claims] (1) A plurality of reading elements are provided in the same magnetic head,
When reading magnetic data from an object to be read, at least one of each reading element is disconnected from an amplifier connected to it and connected to a writing circuit to excite the reading element. A magnetic data reading method characterized by self-diagnosing whether there is any abnormality in the reading element and the reading circuit by generating a change and checking the crosstalk output generated in other reading elements at this time. (2) As a result of self-diagnosis, an abnormality is detected, and control is performed so that all tickets are treated as invalid without determining whether the tickets are valid or invalid. The magnetic data reading method described in scope 1. (3) If an abnormality is detected as a result of the self-diagnosis, the shutter of the ticket slot is closed, the ticket is not transported, and an alarm is issued. A magnetic data reading method according to claim 1, characterized in that: