JPH03102493A - Goods delivery device for automatic vending machine - Google Patents

Abstract

PURPOSE:To decide whether or not the power source circuit of a motor is connected correctly by applying a diagnostic pulse faster than the response speed of the motor to the power source circuit of the motor, and deciding whether or not a movable part is returned at an initial position correctly based on the output of a photodetector at that time. CONSTITUTION:A diagnosing part 22, when detecting a diagnostic instruction 23, supplies a signal 24 with pulse width of several micro seconds to a control part 14, and turns on the control part 14 only for a short period of time, and applies the diagnostic pulse to the motor 7. Since the response speed of the motor 7 is set at >=several miliseconds and that of light emitting diodes 20a, 20b are of several microseconds order, the light emitting diodes 20a, 20b are lit temporarily. Therefore, if a pusher 4 is returned to the initial position, phototransistors 21a, 21b detect the diagnostic pulse at that time. Thereby, it is possible to decide whether or not the power source circuit of the motor 7 is connected correctly even without moving the pusher 4 from the initial position.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a product dispensing device used for dispensing raw materials and products in a vending machine.

Conventional technology Figure 3 shows products 2 that are stacked and stored in Stockka I.
a. 2b..., 3a, 3b..., a product dispensing device is shown in which the pusher 4 is slid to sequentially dispense products located at the lowest stage.

At the bottom 5 of the stocker 1, there are stacked product rows A and B.
A pusher 4 is provided which is slidable in the arrangement direction. The pusher 4 is driven by a motor 7 via a rotation/linear reciprocation conversion mechanism 6 that converts rotational motion into linear motion.

When pusher 4 moves from the solid line position to the imaginary line position,
The product 2a at the bottom of the product row A is held down by the busher 4, and is delivered to a position 1o facing the product take-out port 9 through the delivery port 8 of the stocker 1. A first limit switch l1 is provided at the front end position of the stocker 1, and when the first limit switch 1 detects the pusher 4, the operation of the motor 7 is terminated. When the dispensing instruction is detected again, the operation of the motor 7 is restarted, and the pusher 4
slides toward the product row B, the lowest product 3a of the product row B is pushed out by the busher 4, and the product 3a is dispensed through the dispensing opening 12. After sl・kka1 m!
J {+'/. A second limit switch 13 is provided at the position, and when the second limit switch I3 detects the pusher 4, the operation of the motor 7 is terminated.

FIG. 4 shows the electrical circuit of the device. The control unit l4 connected in series to the motor 7 is . ．． Every time the i'l'g product dispensing instruction 15 is detected, it is turned on and the connection point between the resistor 16 and the first limit switch l1, or the connection point between the resistor I7 and the second limit switch 13 is turned on. Kaga11 L L+
It detects that the level has reversed and turns it “off.”

Problems to be Solved by the Invention In such a conventional configuration, in order to diagnose whether the power supply circuit of the motor 7 is properly connected or disconnected, it is necessary to energize the motor 7 and turn the pusher 4 on. It is necessary to move the pusher 4 and determine whether either the first or second limit switch 11 or 13 has reversed from detecting the pusher 4 to not detecting it. In this way, conventionally,
In order to diagnose whether the power supply circuit of the motor 7 is properly connected or disconnected, it is necessary to move the pusher 4 from its initial state, and after the diagnosis, the pusher 4 is returned to its initial position. In order to do this, it is necessary to carry out the troublesome work of returning the products to the stocker after the products have been dispensed.

The present invention provides a product dispensing device that can detect when a pusher, which is the movable side of the load, has arrived at its initial position, and can also determine whether or not the motor power supply circuit is correctly connected without moving the pusher from its initial position. The purpose is to provide.

Means for Solving the Problems The product dispensing device of the present invention is provided with a light emitting element connected in parallel to a power supply circuit of a motor and a light receiving element facing the light emitting element on a fixed side, and a load driven by the motor. The movable part is provided with a light blocking body that passes between the light emitting element and the light receiving element, and a control part that terminates driving of the motor when the light receiving element detects a reversal of the detection state from a state in which no light is detected. A diagnostic pulse faster than the response speed of the motor is applied to a power supply circuit of the motor, and based on the output of the light receiving element at that time, it is determined whether the movable part has correctly returned to the initial position. It is characterized by having a diagnostic section that performs the following tests.

According to this configuration, during normal operation, the light emitting element lights up as the motor rotates, and during "light blocking" when the light shielding body is interposed between the light receiving element and the light emitting element, the light shielding body turns on the light emitting element and the light receiving element. The control unit detects the reversal to "light receiving" after passing through the interval, determines that the movable part of the load has arrived at the initial position, and turns off the power to the motor.

When diagnosing the connection state, a diagnostic pulse is applied from the diagnostic section to the power supply circuit of the motor. When the motor is not connected, the light emitting element does not light up, so no diagnostic pulse is generated at the output of the light receiving element.

If the motor is correctly connected, the light emitting element lights up in response to the diagnostic pulse, a diagnostic pulse is generated at the output -5- of the light receiving element, and the diagnostic section can determine that the motor circuit is connected. At this time, since the motor has a slow response speed, it does not respond to the diagnostic pulse, and the motor does not rotate at the same time. Therefore, the movable part of the load does not move from its initial position.

EXAMPLE Hereinafter, an example of the present invention will be explained based on FIGS. 1 and 2. Components having the same functions as those shown in FIGS. 3 and 4 showing the conventional example will be described with the same reference numerals.

As shown in FIG.
b is provided. Each photo interrupter 1
9a and 19b are a light emitting diode 20a and a phototransistor 21 that face each other via a path through which a light shield l8 passes.
a, light emitting diode 20b and phototransistor 2lb
It is made up of. First photo interrupter 19a
When the pusher 4 arrives at the initial position on the side of the product row B, the light shielding body l8 is interposed between the light emitting diode 6-ode 20a and the phototransistor 21a and is reversed from the state of blocking light to the state of not blocking light. mounted in position. Similarly, the second lid 1/interrupter 19b switches the light shielding body 18 from the light emitting diode 20 when the lid 1/-4 reaches the initial position on the product row A side.
1) and the phototransistor 2lb, and is installed at a position where the light-shielding state is reversed to the non-light-shielding state. As shown in FIG.
0a and 20b are connected in parallel to the power supply circuit of the motor 7. The control unit l4 detects the product payout instruction l5 and issues “
The state in which one of the fumettransistors 21a, 2lb is "receiving light" and the other one is "blocking light" is reversed to "receiving light", and both fumettransistors 2la. At the timing when it is detected that both 2lb and 2lb are "receiving light", the motor 7 is turned off and the pusher 4 is stopped. When the diagnostic unit 22 detects the diagnostic instruction 23, it starts the control A signal 24 with a pulse width of several microseconds is supplied to the control unit l4 to turn on the control unit l4 for a short period of time to apply a diagnostic pulse 25 to the motor 7.The response speed of the motor 7 is several milliseconds or more. Second, since the response speed of the light emitting diodes 20a, 20b is on the order of several microseconds, the light emitting diodes 20a. , 20b lights up temporarily. Therefore, if the pusher 4 has returned to its initial position, the phototransistors 21a. ,2
lb detects the diagnostic pulse 25 at this time. Diagnosis section 2
2 is the output signal 2Ga, 2 of the phototransistor 21a, 2lb immediately after the above-mentioned signal 24 is supplied.
6b, the signal 21ia. , 261), but Jl
2, when it is detected that the "L" level has turned -11S, it is determined that "the pusher 4 has returned correctly to the initial position". If it is detected that only one of the signals 26a, 2[ib] temporarily reverses to the "L" level immediately after the signal 24 is supplied, it is determined that "the busher 4 has not returned to the initial position". The diagnosis unit 22 makes the determination. Immediately after the signal 24 is supplied, the signals 2Ba, 2[
If ib remains at the "H" level, the diagnostic section 22 determines that "the circuits between the motor 7 and the light emitting diodes 20a and 20b are not connected," and in this case, the sales control section 27 A sold-out message 28 is sent to instruct that the corresponding sales column is sold out.

Note that even when the diagnostic unit 22 performs the above diagnostic operation, the response speed is several milliseconds or more, which is slower than the several microseconds of the diagnostic pulse 25, so the motor 7 does not move during diagnosis. , the pusher is activated when the diagnosis is performed.
I never said that 4 would pay out the goods. therefore,
Even if a diagnostic operation is carried out as in the past, there is no need for troublesome operations such as returning the dispensed product to the stocker.

In the second embodiment, the product dispensing device that slides the busher 4 and sequentially dispenses the products located at the lowest stage was explained as an example. A conventional product dispensing device in which a cam is attached to the motor 7 and the shape of the cam is detected by a limit switch to stop the operation of the motor 7 can also be used.

Effects of the Invention As described above, according to the present invention, a light emitting element connected in parallel to the power supply circuit of the motor 9 and a light receiving element facing the light emitting element are provided on the fixed side, and the light receiving element is driven by the motor. The movable part of the load is provided with a light shield that passes between the light emitting element and the light receiving element, and the driving of the motor is terminated when the light receiving element detects a reversal of the detection state from a state in which no light is detected. A diagnostic pulse faster than the response speed of the motor is applied to the power supply circuit of the motor, and based on the output of the light receiving element at that time, it is determined whether the movable part has correctly returned to the initial position. Since a diagnostic section is provided to make the determination, the light-emitting element lights up temporarily in response to the diagnostic pulse.
By determining the state of the light receiving element of this light in the diagnostic section, it is possible to detect that the movable side of the load has arrived at the initial position, and the motor power circuit can be connected correctly without moving the movable side from the initial position. It can be determined whether the

Moreover, even if the above diagnosis is performed, the motor does not respond to the diagnostic pulse, so the products are not dispensed as a result of the diagnosis, and the troublesome work of returning the dispensed products to the stocker as in the past is -10 - It is unnecessary and operability is improved. Further, if the motor does not operate even though the light emitting element is lit, it is easy to know that the motor is defective.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram of an example of the product dispensing device of the present invention, Fig. 2 is a connection diagram of the electric circuit of the same device, Fig. 3 is a configuration diagram of a conventional product dispensing device, and Fig. 4 The figure is a connection diagram of the electric circuit of the same device. 4...Pusher [movable part], 7...Motor, 14
...Control unit, 15...Product delivery instruction, l8...
- Light shielding body, 19a, 19b... 1st. 2nd photointerrupter, 20a, 20b...Light emitting diode [light emitting element:], 21a, 2lb...Phototransistor [light receiving element], 22...Diagnosis section, 23...Diagnosis instruction, 25... -Diagnostic pulse, 2Ga, ob...Output signal of phototransistors 21a, 2lb.

Claims (1)

[Claims] 1. The fixed side is provided with a light emitting element connected in parallel to the power supply circuit of the motor and a light receiving element facing the light emitting element, and the movable part of the load driven by the motor is provided with a light emitting element and a light receiving element connected in parallel to the power supply circuit of the motor. A light blocking body is provided that passes between the light receiving elements, and a control unit that terminates driving of the motor when the light receiving element detects a reversal of the detection state from a state in which no light is detected is provided, thereby making diagnosis faster than the response speed of the motor. A product dispensing device comprising a diagnostic unit that applies a pulse to a power supply circuit of a motor and determines whether or not the movable part has correctly returned to its initial position based on the output of the light receiving element at that time.