JPH064742A - Article selector for automatic vending machine - Google Patents

Abstract

PURPOSE:To reduce the number of wiring of a wire harnesses even when there are a lot of items in articles to be handled. CONSTITUTION:Article selection switches 1a-1d are serially connected, resistors 9a-9d weighted to the respective article selection switches are parallelly connected, and an arithmetic means 10 is provided to discriminate which article selection switch is operated from the serial resistance of a article selection switch group 2 constituted by serially connecting the switches. Thus, which one of the plural article selection switches is operated can be detected only by reconnecting the article selection switch group 2 and the arithmetic means 10 just with two wires.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a product selection device for a vending machine.

[0002]

2. Description of the Related Art A vending machine has a product selection switch on the customer service side for each product handled, and the user operates the product selection switch corresponding to the product desired to be purchased so that the product can be paid out. Is configured.

As shown in FIGS. 3 and 4, a switch group 2 composed of a plurality of product selection switches 1a to 1n and a signal from the switch group 2 are identified, and a payout instruction 3a to a corresponding product payout device is issued. The control unit 4 that outputs 3n is attached to a position apart from the front door 5,
A wire harness 8 composed of cords 6a to 6n connected to one end of each product selection switch 1a to 1n and a common cord 7 connected to the other end of each product selection switch 2a to 2n is laid around and mounted. .

[0004]

In the product selection device having such a conventional structure, the wire harness 8 becomes thicker as the number of cords of the wire harness 8 increases as the number of items handled increases. Therefore, there is a problem in that the mounting becomes difficult, or the connector is used for connecting the switch group 2 and the wire harness 8 and for connecting the wire harness 8 and the control unit 4 to each other.

An object of the present invention is to provide a product selection device capable of reducing the number of wires of the wire harness 8.

[0006]

The product selection device of the present invention is configured such that product selection switches are connected in series, weighted resistors are connected in parallel to each product selection switch, and the products are connected in series. It is characterized in that arithmetic means is provided for determining which product selection switch is operated from the series resistance of the product selection switch group.

[0007]

According to this structure, it is possible to detect which of the plurality of product selection switches has been operated by connecting only the two wires between the product selection switch group which is connected in series and the calculation means. can do.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. It should be noted that components having the same operations as those of the conventional example shown in FIG. 3 and FIG.

The product selection device of the present invention is constructed as shown in FIG. FIG. 1 shows the case where the operation of the four product selection switches 1a to 1d is monitored. The product selection switches 1a to 1d are connected in series and the weighted resistor 9a is provided for each of the product selection switches 1a to 1d.
9d are connected in parallel to form a product selection switch group 2. The arithmetic means 10 for monitoring the series resistance value of the product selection switch group 2 and identifying which of the product selection switches 1a to 1d is operated is an A / D.
It is composed of a converter 11 and a calculation unit 12.

Specifically, the resistors 9a to 9d are set as follows. Resistor 9a 1KΩ resistor 9b 2KΩ resistor 9c 4KΩ resistor 9d 8KΩ are set respectively, and the arithmetic unit 12 for processing the data digitally converted by the A / D converter 11 is configured as follows. .

The arithmetic unit 12 receives the serial resistance value data of the product selection switch group 2 via the A / D converter 11, and the serial resistance value given by the data is "14 KΩ (2 KΩ + 4
KΩ + 8KΩ) ", the product selection switch 1a is identified as being operated and the output ports O _{1 to} O ₄ are detected.
The output port O ₁ of the above is inverted to the low level. Similarly, the series resistance value given by the data is "13 KΩ (1
KΩ + 4KΩ + 8KΩ) ”, the product selection switch 1b is identified as being operated and the output port O
The output port O ₂ of _{1 to} O ₄ is inverted to the low level. The series resistance value given by the data is "11KΩ (1
KΩ + 2KΩ + 8KΩ) ”, the product selection switch 1c is identified as being operated and the output port O
The output port O ₃ of _{1 to} O ₄ is inverted to the low level. The series resistance value given by the data is "7KΩ (1
KΩ + 2KΩ + 4KΩ) ”, the product selection switch 1d is identified as being operated and the output port O
The output port O ₄ of _{1 to} O ₄ is inverted to the low level. In addition, the series resistance value given by the data of the arithmetic unit 12 is “14KΩ” “13KΩ” “11KΩ” “7.
If the value is not in the vicinity of KΩ ″, it is recognized that a plurality of the product selection switches 1a to 1d are simultaneously operated or not operated, and the output ports O _{1 to} O are recognized.
All _four are configured to stay high for a specified time.

As shown in FIG. 2, the resistors 9a to 9d are mounted on the same printed wiring board 14 as the tact switch 13 as a switch of the product selection switches 1a to 1d, and the product selection switch group 2 and the arithmetic means 10 are provided. Is connected to the connector 15 by two cords 16a and 16b.

With this configuration, even if the number of product selection switches increases in accordance with the number of items handled, the weighting resistance value connected in parallel to each product selection switch can be handled differently from the others. be able to.

Therefore, since the two cords 16a and 16b can be mounted only by routing them, the thin wire harness 8 can be mounted only and the connector 15 can be small in size.

The product selection switches 1a to 1 of the above embodiment
d has been described as being in the on state when operated in the off state in the unoperated state, but may be in the off state when operated in the on state in the unoperated state. It can be implemented similarly. Specifically, the resistors 9a to 9d are set to 1 in the same manner as in the above embodiment.
In the case of KΩ, 2KΩ, 4KΩ, 8KΩ, the operation unit 12
The data of the series resistance value of the product selection switch group 2 is received via the / D converter 11, and when the series resistance value given by the data is a value in the vicinity of "1 KΩ", the product selection switch 1a is operated. And output ports O _{1 to} O
The output port O ₁ of ₄ is inverted to the low level.
Similarly, the series resistance value given by the data is "2KΩ
Series resistance given in. Data for inverting the output port O ₂ of the identify the product selection switch 1b is operated the output port O ₁ ~ O ₄ to a low level when the "vicinity of the value in the case of "4k" near the value inverts the output ports O ₃ of identifying a product selection switch 1c is operated the output port O ₁ ~ O ₄ to a low level. series resistance provided by the data The value is "8K
Inverts the output port O ₄ of identifying a product selection switch 1d is operated the output port O ₁ ~ O ₄ to a low level when the Omega "near the value. The arithmetic unit
12 is the series resistance value given by the data is "1KΩ"
If the values are not in the vicinity of “2KΩ”, “4KΩ”, and “8KΩ”, it is recognized that a plurality of the product selection switches 1a to 1d are simultaneously operated or not operated, and the output ports O ₁ to ₁ are detected. It is configured to keep all of O ₄ high for a defined time.

[0016]

As described above, according to the present invention, product selection switches are connected in series, weighted resistors are connected in parallel to each product selection switch, and the product selection switches are connected in series. Since the calculation means for determining which product selection switch is operated from the series resistance of the group is provided, the product selection switch group and the calculation means can be connected with two wiring cords even when the number of items handled is large. Only by connecting, it is possible to detect which product selection switch is operated, the wiring harness can be easily routed, and the mounting work can be greatly improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a product selection device of the present invention.

FIG. 2 is a cross-sectional view of a product selection switch group of the same embodiment.

FIG. 3 is a perspective view showing a state in which a front door of the vending machine is opened.

FIG. 4 is a configuration diagram of a conventional product selection device.

[Explanation of symbols]

 1a to 1d Product selection switch 2 Product selection switch group 8 Wire harness 9a to 9d Resistor 10 Arithmetic means 11 A / D converter 12 Arithmetic section 16a, 16d Wiring cord

Claims (1)

[Claims] 1. A product selection switch is connected in series, weighted resistors are connected in parallel to each product selection switch, and any product is selected from a series resistance of a product selection switch group formed by the series connection. A product selection device for a vending machine, which is provided with a calculation means for determining whether a switch has been operated.