KR830002572B1 - Recording circuit - Google Patents

Abstract

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Description

Recording circuit

FIG. 1 is a circuit diagram of a recording circuit according to the present invention. FIG.

FIG. 2 is a timing chart for explaining the operation of the recording circuit shown in FIG.

FIG. 4 is a diagram showing an example of setting a binary code signal corresponding to a product; FIG.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording circuit of a recording apparatus to be installed in a vending machine so that the sales situation of an automatic vending machine such as a self-selling refrigerator installed in a room of a hotel, an inn, .

In such a vending machine, the sales situation is confirmed by the storage contents of the storage medium in which the storage element is built. A storage medium is inserted into a recording apparatus installed in a vending machine which is normally closed. When the storage medium is " locked " in the recording apparatus, the door lock of the automatic vending machine is released. The door of the vending machine is again " locked " so that the sales situation can be surely stored in the storage medium. If necessary, the storage medium can be inserted into another apparatus, for example, a reading apparatus installed at the hotel front, to "lock" the storage medium, and then the storage contents can be read to confirm the sales situation. Each merchandise display part of the vending machine is provided with detecting means such as a lead switch. When the merchandise is taken out, that is, when the merchandise is sold, the lead switch operates to form a sales signal, (Different binary code signals for each kind of product) corresponding to the product (the product type of the product), and can be recorded in the storage medium by sending the recording device. According to the recording circuit of the conventional recording device, The signal is applied to an encoder circuit which is a circuit that converts a signal into a pulse having a short width by a latch circuit composed of a flip-flop circuit or the like, and then converts the signal into a signal corresponding to each product. If the sales signal is made by a lead switch, etc., the pulse width of the sales signal is about 40 ms, which is quite large. If such a sales signal is applied to the direct encoder circuit, The time for which the signals are superposed may cause the recording to be erroneous. The latch circuit is provided to eliminate such a problem, and is configured to convert the sales signal into a pulse of a short width and send it to the encoder circuit.

However, according to a conventional recording circuit using a latch circuit, a latch circuit is required at least as many as the number of kinds of merchandise displayed on the shelf, and a flip-flop circuit in the latch circuit needs to be reset to convert the pulse into a short pulse Therefore, the circuit configuration is complicated and the price can not be increased.

The present invention aims to provide a recording circuit which is constructed so as not to require a latch circuit under the above-described conditions, and which can simplify the circuit and reduce the cost.

This object of the present invention is realized by constituting as follows. That is, there are provided an encoder circuit for converting a binary signal of a predetermined number of bits corresponding to a product type of a sales signal, and a pulse signal of a predetermined width when a change occurs in the binary code signal obtained from the output of the encoder circuit A comparison circuit for comparing the pulse signal of the pulse generation circuit with a sales signal or a binary code signal thereof to output an output when both signals are generated; And a clock pulse circuit for generating a clock pulse so that the binary signal is recorded in the storage medium. The binary opportunity signal is generated so that there are no products corresponding to the two binary code signals of the sales signals, Or a binary code signal is generated so that a binary code signal of one product is included in a binary code signal of another product. According to such a configuration, even if the sales signal is duplicated before and after, the output of the comparison circuit can obtain an output pulse for separately recording the binary code signals corresponding to the two sales signals respectively, and also, When a signal is recorded, it is possible to check the accurate sales situation by removing it as an error code signal because there is no corresponding product at the time of reading.

The recording circuit of the present invention will now be described in detail with reference to the illustrated embodiment.

In the following description, a 4-bit binary sign signal (for example, a "100" beer is indicated as "1100" whiskey "1010") is used as a signal corresponding to each product. However, it is also possible to use a binary code signal of a different number of bits.

FIG. 1 schematically shows a recording circuit according to the present invention, wherein (S ₁ ) - (S ₇ ) is a lead switch for forming a sales signal, (A) is a diode matrix (D ₁ ) - (D ₄ ), which converts the sales signal formed by the lead switches (S ₁ ) - (S ₇ ) into a binary code signal of 4 bits (Da, Db, Dc, Dd) the shoe mitteu circuit and (EOR ₁₎ for wave-shaping the output signal of each bit of the encoder circuit (a) - (EOR ₄₎ is exclusive (Exclusive), and an OR _{circuit, (NOR 1), (NOR} 2) (R ₁ ) - (R ₅ ) is a resistor, and (N) is a NOR circuit, (OR) is an OR circuit, IN is an inverter circuit, D ₅ is a Schmitt circuit, C ₁ ) - (C ₅ ) denote capacitors.

The output signal of each bit is directly connected to one of the pressure terminals of the exclusive OR circuits (EOR ₁ ) - (EOR ₄ ), and the output signal of each bit is connected to the other input terminal of the resistors (R ₁ ) - (R ₄ ) and capacitors (C ₁ - C ₄ ). The outputs of these exclusive OR circuits EOR ₁ - (EOR ₄ ) are all connected to the input of the NOR circuit NOR ₁ . Therefore, the NOR circuit NOR ₁ generates, as an output, a pulse signal of a predetermined width with a time constant of the delay circuit when a change occurs in the binary code obtained from the output of the code opportunity A (A). This pulse signal is also applied to the NOR circuit (NOR ₂ ) and compared with the binary output signal obtained from the output of the inverter circuit (IN), that is, the output of the code opportunity circuit (A). Since the output of this inverter circuit IN almost matches the sales signal, the sales signal and the output of the NOR circuit NOR ₁ can be compared in the NOR circuit NOR ₂ .

When one product is pulled out from the vending machine under such a configuration, the lead switch corresponding to the product is closed and the sales signal is formed and applied to the encoder circuit A among the lead switches S _{1 to} S ₇ . The encoder circuit A converts the sales signal into a 4-bit binary code signal corresponding to the product, and sends the output of each bit to the Summit circuits (D ₁ ) - (D ₄ ). For example, if the code signal corresponding to a juice "100", the shoe mitteu circuit _{(D 1), (D 3} ), (D 4) , the output "0" points to the low-potential, (D _2), the classic And an output " 1 " indicating the above is applied to each of them to form a waveform. The outputs of these Schmitt circuits D _{1 to} D ₄ are respectively connected directly to one of the two input terminals of the exclusive OR circuits EOR _{1 to} EOR ₄ and to the other end of the resistor R ₁ , - (R ₄ ) and capacitors (C ₁ ) - (C ₄ ), and is also applied to the OR circuit (OR) and the output circuit (B) at the same time. The output circuit B includes an output buffer circuit for applying various signals to the storage element incorporated in the storage medium, a connection terminal D ₁₁ for applying a 4-bit binary call signal corresponding to the product to the storage medium, (D ₄₁₎ and a connecting terminal for applying a clock signal (CL) to perform the write operation (CL ₁₎ and a connection for applying the operating modal signal (WE) to change the operating modal terminal is provided with a (WE ₁₎ .

The operation mode signal WE is provided for writing to or reading from the storage element. The storage element will be given a signal of potential depending on the role of the recording device and the reading device, in order to make it into the recording mode when it functions as a recording device and as a reading mode when it serves as a reading device.

The operation when one sale is performed as described above will be described with reference to a timing chart shown in FIG. 2 as follows.

First, when a sales signal is generated as shown in FIG. 2 (a), if the sales signal is due to, for example, the juice indicated by the above-mentioned binary portion, the output of the encoder circuit A becomes "100" shoe mitteu circuit (D ₂₎ only to the signal, since applying the output of the exclusive OR circuits (EOR ₂₎ is the time constant of the resistance (R ₂₎ and capacitor (C ₂₎ as shown in claim 2 (b) Fig. As shown in Fig. At this time, the output of the OR circuit OR is as shown in FIG. 2 (c), and the outputs of the other exclusive OR circuits EOR ₁ , EOR ₃ , and EOR ₄ are "0". Therefore, the pulse shown in the second (d) is obtained as the output of the NOR circuit (NOR ₂ ). The pulse at the rear of the exclusive OR circuit EOR ₂ appearing at the end of the sales signal does not appear at the output of the NOR circuit NOR ₂ because the output of the OR circuit OR is "0" at that moment. The output pulse of the NOR circuit NOR ₂ is applied to the Summit circuit D ₅ through a delay circuit composed of a resistor R ₅ and a capacitor C ₅ and is output as its output as a pulse Is obtained. But as the output of the encoder circuit in the above description describes the case where a binary code of "100" is obtained, for example, if the quality 2 cliche of the "100" call is obtained, the exclusive OR circuit (EOR _2), (EOR ₃ (B) are obtained in the first and second steps (d) and (e), respectively. Therefore, the output of the OR circuit OR shown in FIG. 2 is used as the above-mentioned operation mode signal, and the output of the Summit circuit D ₅ shown in FIG. 2 (e) is used as a clock pulse for recording A sign signal of "1001" in the case of a binary call signal carried on the connection terminals D ₁₁ - (D ₄₁ ), for example juice, is stored when the output from the Summit circuit D ₅ is stored Lt; / RTI >

At this time, the memory element has a 4-bit input terminal (corresponding to the connection terminals D ₁₁ - D ₄₁ of the output circuit B) and has a predetermined number (this number is determined according to the total number of display products) (Shift register), the sales situation can be recorded by storing the binary code signal while shifting the storage contents for each sales signal.

Now, description will be made with reference to the operation waveform diagram of FIG. 3 with respect to the operation when the other product is sold during the period in which the sales signal is generated, thereby indicating a period in which the sales signal is overlapped. As shown in FIG. 3 (a), when another sales signal (b) as shown in FIG. 3 (b) is displayed when a sales signal a is displayed and another product is sold, a NOR circuit (P ₁ ) - (P ₄ ) of the third (c) diagram is likely to appear as the output of the NOR ₂ . Among the output pulses of the NOR circuit NOR ₂ , P ₁ is always present, and (P ₄ ) does not appear because the output of the OR circuit OR is "0". (P ₂ ) (P ₃ ) depends on the state of the two binary call signals. That is, the binary code signal formed in the encoder circuit A by the sales signal a is included in the binary code signal formed by the encoder circuit A by the sales signal b, for example, If (a) the binary code signal is "1000" and the binary code signal by the selling signal (b) "1100" by the pulse shown in (P ₃₎ it does not appear.

If on the other hand a binary code signal that is formed in the encoder circuit (A) by the selling signal (b) included in the binary code signal to be formed in the encoder circuit (A) by pamae signal (a), in (P ₂₎ The indicated pulse does not appear.

According to the present invention, the present invention enables the sales situation to be accurately recorded even when a period of overlapping with the sales signal appears. In the present invention, a binary call signal formed according to each sales signal by the lead switches (S ₁ ) - (S ₇ ) is exemplified as follows. In the case of 4 bits, two binary code signals If it is determined that the binary code signal is completely different from the binary code signal which is not shown in FIG. 4 when it is duplicated, the other binary code signal is completely included in one binary code signal. By selectively setting each binary code signal corresponding to the product as described above, the binary code signal not shown in FIG. 4 is regarded as an error code signal and is removed when the storage contents of the storage element are read, Can be recorded. For example, assuming that the binary code signals not shown in FIG. 4 are formed so that two binary code signals appear before and after the same, the output of the NOR circuit NOR ₂ shown in FIG. (P ₁ ), (P ₂ ), and (P ₃ ) shown in FIG. The pulse P ₄ shown in FIG. 3 (c) does not appear at the output of the NOR circuit NOR ₂ since the output of the OR circuit OR is "0" at this time. Therefore, the write operation of the binary sign signal shown before is performed by the clock pulse CL formed in the Summit circuit D ₅ according to the pulse P ₁ , and the clock signal CL generated similarly in accordance with the pulse P ₂ A binary code signal in which two binary codes are overlapped by a pulse CL is recorded, and the binary code signal which is indicated by a clock pulse CL formed in accordance with the pulse P < ₃ > A signal is recorded.

Only the pulses P ₁ and P ₂ shown in FIG. 3 (c) appear as output pulses of the NOR circuit NOR ₂ when the binary code signal generated first occurs in the binary code signal generated later, The writing of the binary code signal which is formed in accordance with the pulse P ₁ and originally caused by the clock pulse CL is performed and the subsequent binary code generated by the clock pulse CL formed in accordance with the pulse P ₂ A signal is recorded. (P ₁ ) - (P ₄ ) shown in FIG. 3 (c), only the pulses P ₁ and P _{3 shown in} FIG. ₃ The binary coded signal generated first by the clock pulse CL formed in accordance with the pulse P ₁ is generated and the clock pulse CL generated in accordance with the pulse P ₃ is generated by the output pulse of the NOR circuit NOR ₂ , The binary code signal generated later is recorded by the code signal CL. Therefore, when a binary code signal not shown in FIG. 4 is read out, it is regarded as an error code signal and removed, so that even if an overlapping period occurs in the sales signal, the sales situation can be correctly read.

As described above, according to the present invention, the sales situation can be accurately confirmed with a simple structure that does not use a latch circuit or the like, and the cost of the recording circuit can be reduced.

Claims (1)

The present invention is characterized in that there is a change in the binary code signal obtained by the output of the encoder circuit (A) which converts each sales signal formed corresponding to the product type of the sold product into a binary code signal corresponding to the product type of the product (EOR ₁ , R ₁ , C ₁ ; EOR ₂ , R ₂ , and C ₂ ; EOR ₃ , R ₃ , and C ₃ ; EOR ₄ , R ₄ , and C ₄ ) A comparing circuit (NOR ₂ ) for comparing the pulse signal of the pulse generating circuit with a binary code signal serving as a sales signal to generate an output when both signals are generated, and a comparator circuit a cluster pulse generator for generating clock pulses for writing in a storage medium circuit write circuits, characterized in that it is composed of _{(R 5, C 5, D} 5).

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