JPS604504B2 - Magnetic reading method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for reading characters such as numbers and symbols from sheets such as bills and checks printed with magnetic ink in an EI font using a magnetic detection element such as a magnetic head. Regarding the method.

It is desired that a device that implements such a magnetic reading method be as simple as possible. The main object of the invention is therefore to provide a method with which magnetic reading can be carried out with a simplified structure. FIG. 1 is an overall system diagram of an embodiment of the present invention.

EI box font characters 2 are arranged along the longitudinal direction and printed with magnetic ink on sheets such as bills and checks. Such a sheet is like arrow 3,
As the sheet 1 is moved along its length, it is read by a reading magnetic head 4 provided at a fixed position. Prior to reading this character, a writing head 6 is provided in a fixed position on the upper side of the sheet 1 in the direction of movement 3. FIG. 2 is a horizontal sectional view of the device for transporting the sheet 1, and FIG. 3 is a simplified longitudinal sectional view thereof.

When the sheet 1 passes in its longitudinal direction along the path 8 defined by the guide walls 6, 7 along the direction of the arrow 3,
Magnetic heads 4 and 5 act magnetically on the character 2.
As mentioned above, the sheet 1 includes bills, stamps 4, and the like, and these bills and checks have different shapes. Therefore, the side 9 along one longitudinal direction of the sheet 1 is moved along one of the guide walls 6, thereby moving the magnetic head 5 toward the character 2 printed with magnetic ink at a predetermined position.
It becomes possible to write and read accurately by the magnetic head 4. In order to transport the sheet 1 in the movement direction 3, three pairs of belts 10 are provided between the guide walls 6, 7, one above the other. These belts are placed one above the other and stretched by two pairs of pulleys 11 and 12 having horizontal axes.The pulleys 11 and 120 are each fixed to a rotating shaft. A pulley 13 is provided in association with the belt 10a provided at the center in the width direction.This pulley 13 is rotationally driven by a motor.The part of the belt 10a where the pulley 13 contacts the sheet 1 Since the portion 10c of the belt 10a is provided at a position opposite to the portion 10c, the vibration of the portion 10c of the belt 10a is less likely to be transmitted to the sheet 1, so that the sheet 1 can be moved horizontally. A pair of rollers 4 having a horizontal axis and having an angle Q (see FIG. 2) on the moving direction 3 side with respect to the moving direction 3 are arranged at the upper side of the moving direction 3. The seat is first moved along the moving direction 3 while being sandwiched between the rollers 4 with the side 9 of the seat in contact with the guide wall 6, and then moved by the belt 10. It will be moved in direction 3.

In this way, it becomes possible to move the side portion 9, which serves as a reference for the seat, along the guide plate 6. If the pressure applied by the rollers 4 to sandwich the sheet from above and below is too strong, the sheet 1' will come into contact with the guide wall 6 and be manipulated. Therefore, within the range of sufficient pressure to bring the sheet closer to the guide wall 6, the pinching force of the sheet 1 caused by the roller 141 is configured to be small. FIG. 4 represents characters such as numbers and symbols in an EI-style font. Each character is 0, 1, etc. toward the rear in the moving direction 3 of the sheet 1.
. . , drawn with reference to an equal unit interval d marked 7. These characters are defined by the term "stroke" and the numbers "0", "1J," as shown in Table 1 in the JIS standard.
・・・・・・It is called by the combination with "13". Table 1 When the sheet 1 moves in the moving direction 3, the writing magnetic head 5 detects one end of each character along the moving direction 3 (in this embodiment, the front end in the moving direction 3, the right side in FIG. 4). N
magnetize to the poles.

FIG. 41 shows the stroke 1 enlarged, and in comparison, the characters in FIGS. 42 to 414 are shown smaller than the characters in FIG. 41. In FIG. 4, the front end of the character along the moving direction 3 is magnetized to the north pole, and the rear end, which is the other end, is magnetized to the south pole. When the character 2 thus magnetized passes the reading magnetic head 4 as the sheet 1 moves, a current waveform shown in FIG. 6 is generated from the reading magnetic head 4. The north pole detected by the read magnetic head 4 is above or on the positive side of the horizontal reference level in FIG. 5, and the south pole is below or on the negative side. The output level from this read magnetic head 4 is N or S polarity moving direction 3.
It is proportional to the length in the direction perpendicular to , that is, the vertical direction in FIG. According to the present invention, it is possible to identify and read a character based only on the negative output waveform corresponding to the south pole of the output of the character 2 detected by the reading magnetic head 4.

In the above-mentioned Table 1, the circle mark is the output waveform from the reading magnetic head 4 to be detected at each detection position,
This allows character 2 to be identified. Although the △ marks in Table 1 are not necessarily necessary for identifying the character 2, in the embodiment shown in the first figure, they may be used in the decoder 29, which will be described later, to identify these signals. Referring again to FIG. 1, the character 2 is magnetized by a write magnetic head 5 and then read by a read magnetic head 4, which converts the magnetic changes in the character 2 into an electrical signal in an analog waveform.

The electrical signal from the read magnetic head 4 is amplified by an amplifier 17. The amplified output from the amplifier 17 is input to the amplifier 201 via diodes 18 and 19 connected in parallel with opposite polarities. Figure 6 shows the diode 18
, 19 is a graph showing the relationship between the electrical signal input to the input side connection point 21 and the electrical signal outputted from the output side connection point 22.

Since the diodes 18 and 19 are connected to each other in a reversed manner, they have nonlinear characteristics over the positive and negative sides of the input signal as shown in FIG. Then read magnetic head 4
The output signal from amplifier 17 and therefore the output signal from amplifier 17 2
3 is input to the input side connection point 21, an output having a waveform 24 is obtained from the output side connection point 22. In this way, the nonlinear characteristics of the diodes 18 and 19 are utilized to improve the rise of the output waveform from the read magnetic head 4, and the unit read interval d (fourth
(see figure) enables accurate reading of electrical signals. In this way, the output from amplifier 20 is
It has the waveform shown in FIG.

The signal that detects the front end of the character 2 corresponds to the north pole, and if the output of this electric signal is positive, the south pole is negative.
The output from the amplifier 20 is input to a first data circuit 27 via a diode 26 of a polarity detection circuit 25. The output signal from the diode 26 has the waveform shown in FIG. 7, and the data circuit 27 shapes the waveform to output a rectangular wave shown in FIG. 7. The output from the first data circuit 27 is an AND gate 28
is given to one input of

The output of this AND gate 28 is input to a decoder 29. A signal representing the timing at which the output from the first gate circuit 27 should be read by the decoder 29 (see FIG. 7, 15) is applied to the other input of the AND gate 28 along with the decoder 29. Decoder 29 responds to the output from AND gate 28 and outputs a signal representing a character based on Table 1. Another diode 67 in the polarity detection circuit 25 has a direction opposite to that of the diode 26 described above, and the output from this diode 67 is shown in FIG. The output from the diode 67 is input to a differentiating circuit 30, and the input waveform from this differentiating circuit 30 is shown in FIG. Due to the fact that the front end of the character is magnetized to the north pole, the output of the differentiating circuit 30 always rises to the positive side, and suddenly rises at the maximum point 31 of the output from the diode 67 (see Fig. 7, 4). Falling down. This falling portion is indicated by reference numeral 32. This maximum point 31 allows accurate setting of the reading start point of character 2. The output from the differentiating circuit 30 is input to the second data circuit 33. This differential circuit 3
The second data circuit 33 generates a rectangular wave shown in FIG. 7 by using the falling edge 32 of the output from 0 (see FIG. 7, FIG. 5). The falling edge 32 corresponds to the rising edge 34 (see FIG. 7, 6) of the rectangular wave. A rising edge 34 on line 35 from data circuit 33 is applied to mode clear circuit 36 and comparison voltage circuit 37. As shown in Figure 1,
The output shaft 38 connected to the pulley 13 of the motor 80 has a
A timing disk 39 is secured.

A large number of through holes 40 are bored in this timing disk 39, and a light receiver 41 receives light from a light emitter 40 through the through holes. The pitch P of the through holes 40 is equal, and when the through holes 40 are angularly displaced by two pitches, the sheet 1 moves by a unit distance d in the movement direction 3. The output waveform from the light receiver 41 is shown in FIG. 81. The output from the light receiver 41 is subjected to level discrimination and waveform shaping in the simultaneous signal generation circuit 42 as shown in FIG. 82. The pulse time interval T corresponds to the pitch P of the through holes 40,
At time 2r, sheet 1 moves by unit distance d.
The output waveform from synchronization signal generation circuit 42 is also shown in FIG. The sawtooth wave generation circuit 43 generates an in-phase and synchronized mirror-tooth wave in response to a pulse having a waveform shown in FIG. 8 from the synchronization signal generation circuit 42. This chain-tooth wave is shown in FIG. When the comparison voltage circuit 37 is started by the rising edge of a pulse from line 35 (see FIG. 7), the output line 4 of the comparison voltage circuit 37
4, a rectangular wave shown in FIG. 7 is outputted, and line 45 is outputted with a waveform shown in FIG. 7, 10.

Transfer circuit 46 responds to inputs from lines 44 and 45 to derive an output pulse on line 47 having the waveform of FIG. 7. The output waveform of the transfer circuit 46 is a silver tooth wave which is successive at a higher interval and has a level equal to or lower than the slice level 48 among the mirror tooth waves shown in FIGS. The pulse output from the second data circuit 33 on the line 35 is formed by the falling edge of the first sawtooth wave 49 of the transfer circuit 46 to form a falling rectangular wave as indicated by reference numeral 51. A falling edge 51 of the rectangular wave on line 35 is detected by mode clear circuit 36 . This mode clear circuit 36 resets the second data circuit 33 to put it into a dormant state. Therefore, the differentiator circuit 30
Even if the residual differential waveforms 52 and 53 shown in FIG. 7 are input to the second data circuit 33 from
Therefore, the second data circuit 33 does not operate. The waveform shaping circuit 54 uses the intermittent falling edges 50 and 55 of the output having the waveform shown in FIG.
6.

The output waveform on line 56 is shown in FIG. The period TI of the rectangular wave is twice the period T of the output from the synchronization signal generation circuit 42 shown in FIG. 8 (TI=
2xT). The rectangular wave on the line 56 from the waveform shaping circuit 54 is applied to the check pulse circuit 58, and a pulse having the waveform shown in FIG. 7 is output from the line 59. The pulse from this line 59 is connected to the AND gate 28
and is input to the decoder 29. The output from AND gate 28 is therefore as shown in FIG. 7.16. Pulses on line 56 from waveform shaping circuit 54 are provided to monitor clock circuit 60'.

The monitor clock circuit 6 responds to an input pulse from line 56 and generates a pulse at the rising edge of the input pulse, which is input from line 61 to counter 62. Counter 62 is connected to line 6 from mode clear circuit 36.
It is set by a set pulse via 3 and enters a counting operation state. This set pulse is generated from the mode clear circuit 36 at the rising edge 34 of the pulse in FIG. Counter 62 counts eight pulses from monitor clock circuit 60 via line 61 and
4 gives a reset output signal to the mode clear circuit 36 to put the mode clear circuit 36 into a reset state. The reading of a single character is thus completed and the state returns to the state in which the next character is ready to be read. Figure 7 12 is line 6
8 waveform. Check pulse circuit 58 to line 5
In the output pulse to sheet 1, the pulse width of FIG. 7 is made as small as possible as shown in FIG.
Even when there is a deviation between the moving speed of the light beam and the pulse of FIG.

As described above, according to the present invention, one end of the character of the EI spot font along the direction of relative movement with the magnetic detection element is magnetized to have the same one-way characteristic, and based on the detection output of the other-way characteristic by the magnetic detection element. Since the characters are identified by the characters, the characters can be identified and read with a simple configuration.

[Brief Description of the Drawings] Fig. 1 is a system diagram of an embodiment of the present invention, Fig. 2 is a horizontal cross-sectional view showing the structure for moving the seat, and Fig. 3 is a system diagram of an embodiment of the present invention.
FIG. 4 is a diagram showing the characters of the EI target font; FIG. 5 is a diagram of the output waveform of the character read by the reading magnetic head 4; FIG.
The figure is a waveform diagram for explaining the function of the diodes 18 and 19 in the embodiment shown in FIG. 1, FIG. 7 is a waveform diagram for explaining the operation shown in FIG. 1, and FIG.
FIG. 2 is a waveform diagram for explaining the function of FIG. 1...Sheet, 2...Character, 4...
...Reading magnetic head, 5...Writing magnetic head, 10...Belt, 11, 12...
Pulley, 14... ...Motor, 15...0-ra. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8

Claims (1)

[Claims] 1 Print the E13B font character on a sheet with magnetic ink, move the sheet and the magnetic detection element relatively,
A magnetic reading method, characterized in that one end of each character along the direction of relative movement is magnetized to the same one polarity, and the character is identified and read based on the detection output of the other polarity by the magnetic detection element.