JPS6243412Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printed matter reading device that samples data from printed matter such as banknotes using timing signals generated at regular intervals.

2. Description of the Related Art Conventionally, in an apparatus for discriminating printed matter such as banknotes, a system as shown in FIGS. 1 to 3 has been used as a device for sampling data from printed matter. That is, in FIGS. 1 and 2, banknote 1
is sandwiched between the belts 4 and conveyed in the direction of the arrow. 2 and 2' are passage detection devices that detect the passage timing of banknotes; for example, 2 is a lamp;
2' is composed of a light receiver such as a photocell. 3 is a reading detection device that detects the color, density, magnetism, etc. of banknotes. Then, in the detection device 3, for example, as shown in FIG.
Sampling pulses are generated at positions corresponding to P ₀ , P ₁ , and P ₂ shown in FIG. 3, and signals from banknotes are sampled to determine the type, authenticity, etc.

However, in order to generate a sampling pulse in such a discrimination device, first, based on the output of detector 2 (a in Figure 3), a pulse is delayed by a time corresponding to the distance between AB in Figure 1. A pulse (Fig. 3b) is generated, and sampling pulses are generated at fixed time intervals starting from the tip of this pulse (corresponding to P ₀ ).

That is, for example, during the period shown in FIG _.
It generates pulses corresponding to the positions of P ₂ , P ₃ ....

However, in such a method, when the conveyance speed of the banknote changes or the frequency of the clock pulse changes, a deviation occurs between the sampling pulse and each point P ₁ , P ₂ , and P ₃ .
There is a drawback that banknotes cannot be sampled at equal intervals. The present invention was devised based on the above-mentioned circumstances, and it is an object of the present invention to provide a printed matter reading device that can generate sampling pulses without the above-mentioned drawbacks.

Hereinafter, the present invention will be explained with reference to an illustrated embodiment.

In FIG. 4, reference numeral 1 indicates a banknote as a printed matter that is sandwiched between belts and is conveyed in the direction of the arrow; 2 is a device that detects the passage timing of the banknote; for example, 2-1 and 2-2 are lamps; -1 and 2'-2 use photocells. 3 is a photoelectric conversion device that detects the color, density, etc. of banknotes, and each point P _A , P _B , P _C is
Detection points on the conveyance path of each device 2-1, 2-2, and 3 are shown.

FIG. 5 shows an example of the circuit configuration, and FIG. 6 shows its timing chart.

Figure 6A shows that the tip of banknote 1 is P in Figure 4.
When the signal is between _A and P _B , only the count gate pulse A in FIGS. 5 and 6 is at the "1" level. This signal A is added to the AND gate 11 as a gate pulse with a frequency _{of 1}
The count pulse passes through the AND gate 11 and is counted by the counter 13.

When the leading edge of the bill reaches P _B in FIG. 4, the counter 13 stops counting and the contents of the counter 13 are latched into the register 14 by the latch pulse B. Immediately after that, the counter 13 is cleared by the clear pulse C. Therefore, the register 14 stores a value obtained by counting count pulses of frequency ₁ while the leading edge of the bill passes between PA _{and PB} , and this count value is set as _N1 .

On the other hand, when the leading edge of the bill reaches P _B , the count gate pulse D becomes 1 level, and the count pulse of frequency ₂ passes through the AND gate 12 and is counted by the counter 16 .

Then, the value of counter 16 and the value of register 14
_N1 is compared by the comparator 15, and each time the two match, a match pulse E is output and the counter 16 is cleared. Here, there is no change in the conveyance speed of the banknote, and the speed V is constant at P _A , P _B , and P _C
Assuming that, the value N ₁ of the register 14 is N ₁ = D _AB /V (D _AB is the distance between P _A P _B ), and in the counter 16, N ₁ = D _X /V × ₂ . A coincidence pulse E is output every time, and the counter 16 is cleared. _D.sub.X is the distance that the bill travels from when the counter 16 starts counting until it is cleared.

_Therefore , from the above _{formula ,} D _{X / V 2} = _{D AB / V 1} D _AB is generated every time a banknote travels.

Also, if ₁ is created by counting down from ₂ ( ₁ = 1/n ₂ ), then D _X = 1/n・D _A
B , and the coincidence pulse E has a count frequency _{of 1} ,
This means that it will not be affected by fluctuations in ₂ .

The coincidence pulse E is then used as a sampling of banknotes.

That is, the output of the photoelectric conversion device 3 is transmitted to the amplifier 17.
The signal is amplified and applied to a sampler 18, where it is sampled by the coincident pulse. Using this sampled signal, a discriminating section (not shown) discriminates the authenticity, type, etc. of the bill.

Note that the count gate pulse D mentioned above is returned to the 0 level when a required number of matching pulses E (sampling pulses) are obtained.

In the above embodiment, a bill discriminating device has been described, but the present invention is not limited to bills, and can be applied to other printed materials such as mark sheets and forms.

As explained above, according to the present invention, printed matter is sampled and read at equal intervals and can be read without being affected by changes in the running speed of the banknote or the frequency of the clock pulse.

[Brief explanation of drawings]

FIG. 1 is a plan view of a conventional printed matter reading device, FIG. 2 is a perspective view thereof, FIG. 3 is a diagram showing signal waveforms, FIG. 4 is a plan view of a printed matter reading device according to the present invention, and FIG. The figure is a circuit diagram thereof, and FIG. 6 is a timing chart showing waveforms of various parts of the circuit of FIG. 1... Banknote, 2... Passage detection device, 3... Photoelectric conversion device.

Claims (1)

[Scope of utility model registration request] A first detection means for detecting passage of printed matter conveyed by the conveyance path, and a second detection means provided at a distance N times the sampling pitch of the printed matter in the conveyance direction from the first passage detection means. A period during which the printed matter passes between a passage detection means, a reading means provided behind the second passage detection means in the conveyance direction and reads data from the conveyed printed matter, and the first and second passage detection means. a time measuring means for counting clock pulses at a first frequency ₁ , a storage means for storing the measurement results of the time measuring means, and a second clock pulse for counting clock pulses at a second frequency ₂ which is N times the first frequency. and a timing signal for generating a timing signal and clearing the measured value of the second time measuring means every time the measurement result of the second time measuring means and the storage content of the storage means match. 1. A reading device for printed matter, comprising: a generating means; and a sampling means for sampling an output signal of the reading means based on a signal from the timing signal generating means.