JPS6395010A - Electric coffee brewer - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Industrial applications The present invention relates to an electric coffee brewer.

2. Prior Art Conventional electric coffee brewers start extracting coffee liquid by setting the grinding time for the coffee beans after placing water and coffee beans in a tank or cupboard.

Problems to be Solved by the Invention Accordingly, with such a configuration, not only is it necessary to set the grinding time depending on the amount of coffee beans, but also the grinding time may be set incorrectly.

Means for Solving the Problems The present invention has been made in relation to the above, and includes a water level detection section that detects the amount of water, and controls the energization time to the motor so that it changes in accordance with the amount of water passing through the water level detection section. The control element is provided in the control section.

By doing this, when the amount of water is large, the time for energizing the motor is increased, and when the amount of water is low, the time for energizing the motor is decreased.

Example An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic cross-sectional view of the structure of an electric coffee maker according to the invention. In the figure, 1 is a water tank to hold water, 2 is a filter basket to hold paper filters, etc., 3 is a mill case to put coffee beans and grind them, and 4 is a mill case 3.
This is a cutter installed inside the machine to grind coffee beans.

A slit 5 is provided between the filter basket 2 and the mill case 3 so that the coffee beans in the mill case 3 are pulverized by the cutter 4 and fall into the filter basket 2 as coffee powder. 7 is a glass cup for receiving coffee liquid, and is provided below the filter basket 2. 6 is the cup lid of the glass cup 7. 8 is a motor that rotates the cutter 4 and is installed below the mill case 3. A heater 9 heats the water in the aquarium 1 via a heating pipe 11, which will be described later, and is provided below the glass cup 7. 10 is a check valve that connects water tank 1 and heating pipe 1
The water in tank 1 is connected to the joint of heating pipe 1.
The hot water enters the water tank 1 and is heated by the heater 9 to become water vapor, which increases the pressure inside the heating pipe 11 and moves toward the water tank to prevent hot water from flowing back into the water tank 1. Reference numeral 12 denotes a spouting pipe that spouts hot water heated by the heater 9 from above the filter basket 2. 13 is a switch which, when pressed, operates the electric coffee brewer.

Reference numeral 14 is a lamp for indicating energization, and reference numeral 15 is a control unit including a microcomputer and the like provided inside the main body 36. A thermostat 27 detects the temperature of the heating pipe 11 heated by the heater 9.

Figure 2 shows the schematic structure of the part that detects the amount of water.
It is provided between the water tank 1 and the detection pipe 17 to lead to the detection pipe 17 communicating with the water tank 1 and the detection pipe 17.

The detection pipe 17 is made of a transparent material such as glass.

18 is a water level gauge that detects the increase or decrease in the amount of water that moves up and down inside the pipe 17, and is made of non-transparent material so that it can block the light from light emitting diodes 19, 20, 21, and 22, which will be described later. Further, the water level gauge 18 is designed to float on the water surface at about half the length of the main body.The water level gauge 18 has a length that can block two of the lights at the same time, and can block three of the lights at the same time. 19, 20, 21, and 22 are light emitting diodes, and 23, 24, 25, and 26 are phototransistors that receive the light emitted by the light emitting diodes 19, 20, 21, and 22. light emitting diode 19.20
．． 21.22 and phototransistor 23.24.25.
26 is a light emitting diode 19 and a phototransistor 23;
A light emitting diode 20 and a phototransistor 24, a light emitting diode 21 and a phototransistor 251, a light emitting diode 22 and a phototransistor 26 are each arranged in pairs with a detection pipe 17 in between, so as to detect the position of the water level gauge 18. There is.

Figure 3 shows a part of the water level detection circuit in which the phototransistor 23 is activated when the water level gauge cuts off the light from the light emitting diode 19.
is in the OFF state and the output becomes [)(]. Conversely, when the water level gauge does not cut off the light from the light emitting diode 19, the phototransistor 23 is in the ON state and the output becomes [L].
] and is transmitted to the water level detection section 31 described later.

FIG. 4 is a block diagram inside the control unit 15. In the figure, 35 is an AC 100V power supply unit, and the voltage from this power supply unit 35 is converted to a DC low voltage (Vcc) through a rectification and smoothing circuit 32.
At the same time, this DC low voltage (Vcc) is applied to a control element (hereinafter referred to as microcomputer) 28 consisting of a microcomputer. Reference numerals 33 and 34 are power control elements, and a DC low voltage (Vcc) is also applied to these power control elements 33 and 34. This microcomputer 28 includes a switch 13, a clock circuit 29. The output from the water level detection unit 31 that detects the water level via the water level gauge 18 is input, and the time for energizing the motor 8 according to the signal from the water level detection unit 31 (the amount of water in the water tank 1);
It has a function to determine the initial energization rate to the heater 9, etc., and as the water level in the water tank 1 decreases, the energization rate to the heater 9 is lowered, and when the coffee liquid extraction is completed, the buzzer circuit 30 is activated.
It also drives a buzzer (not shown) to sound.

The operation of this embodiment will be described below.

When you put water, coffee beans, etc. into the water tank 1 or mill case 3 and press the switch 13, the motor 8 starts rotating via the microcomputer 28 and the power control element 34, and at the same time the water level gauge 1
8 to detect the amount of water in the aquarium 1. The amount of water is determined by the position of the water level gauge 18.

Now, if there are 5 cups of water in the aquarium 1, the water level gauge 18 will indicate that all the light emitting diodes are 19°20.21.2.
2 without blocking the light of phototransistor 23, 24,
25 and 26 are in the ON state.

In addition, in the case of 4 cups of water, the phototransistor 23
If the amount of water is 3 cups, only the phototransistor 24 is OFF; if the amount of water is 2 cups, only the phototransistor 25 is OFF; and if the amount of water is 1 cup or less, the phototransistor 26 is OFF.

In this way, the signal from the water level detection unit 31 transmitted via the water level gauge 18 changes depending on the amount of water in the aquarium 1, so that the water level in the aquarium 1 can be accurately detected via the microcomputer 28.

Moreover, if it is determined that the detected amount of water is large, the microcomputer 28
The power supply time to the motor 8 is lengthened via the power control element 34, and the time for power supply to the motor 8 is similarly changed to be shortened as the amount of water detected is smaller.

At the same time as the coffee beans have finished grinding and the power supply to the motor 8 is stopped, the microcomputer 28 starts supplying power to the heater 9 via the power control element 33.

Start extracting the coffee liquid.

In addition to the effects of the invention, according to the present invention, the energization time for the motor is automatically set by detecting the amount of water in the aquarium, which eliminates the hassle of setting the energization time for the motor each time as in the past. To provide an electric coffee boiler which eliminates setting errors in energization time and can extract coffee liquid with a simple one-touch operation of pressing a switch.

[Brief explanation of the drawing]

Fig. 1 is a schematic cutaway sectional view of essential parts of an electric coffee boiler according to an embodiment of the present invention, Fig. 2 is a schematic structural diagram for explaining water level detection, and Fig. 3 is a diagram of a water level detection circuit. FIG. 4 is a system block diagram within the control section. 1...Aquarium, 8...Motor, 15...
- Control unit, 28... control element.

Claims (1)

[Claims] The water led from the water tank provided in the main body is heated by a heater that is energized and controlled via the control unit, and the coffee beans in the mill case are ground by a cutter that is transmitted with the rotation of a motor driven via the control unit. In an electric coffee boiler that extracts coffee liquid by dripping hot water heated by a heater onto the ground coffee powder, a water tank (1
), and a control element (28) that controls the energization time to the motor (8) to be changed in accordance with the amount of water passing through the water level detection section (31). An electric coffee boiler characterized in that it is provided in a control section (15).