JP2877555B2 - Coffee boiler with mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coffee machine with a mill for grinding coffee beans.

[0002]

2. Description of the Related Art In this type of coffee boiler with a mill, the driving time of a motor for rotating a cutter in a mill container is set in advance in accordance with a quantity such as the number of coffee cups to be extracted. (See, for example, JP-A-57-110218).

However, the driving time of the motor, that is, the time to grind the coffee beans, is not always constant, and varies depending on the amount, type, hardness and power supply voltage of the coffee beans put into the mill container by the user. is there. Therefore, although the coffee beans have been ground, the motor is further driven, which causes unnecessary idle time and noise.

[0004]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems, makes the time for crushing coffee beans appropriate with a simple structure, eliminates unnecessary idling time of the motor, and eliminates noise. An object of the present invention is to provide a coffee machine with a mill capable of obtaining delicious coffee.

[0005]

In order to achieve the above-mentioned object, a coffee boiler with a mill according to the present invention comprises a water tank for storing water, a cutter for accommodating coffee beans and crushing the coffee beans. Equipped mill container, a motor for driving the cutter, heating means for heating water from the water tank to supply hot water to the coffee powder pulverized by the cutter, and detecting a rotation speed of the motor. The number of revolutions detecting means, when the number of revolutions detected by the number of revolutions detecting means reaches a predetermined number, the motor is stopped and the energizing time of the heating means in the subsequent unevenness step is proportional to the driving time of the motor. The above-mentioned spotting process
And control means for setting within a range not exceeding .

[0006]

According to the above construction, the rotation speed of the motor for driving the cutter is detected by the rotation speed detecting means, and the detected rotation speed is increased when the coffee beans are crushed into coffee powder and the predetermined rotation speed is increased. By stopping the motor when the number is reached, the amount and type, hardness and
Regardless of the power supply voltage, the motor is stopped when the coffee beans are crushed into coffee powder, and the idle time is eliminated.

Further, by setting the energizing time of the heating means in the unevenness step in proportion to the driving time of the motor, an amount of hot water corresponding to the amount of coffee powder is supplied,
As a result, sufficient spotting is performed.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes a main body of a coffee boiler equipped with a mill. The main body 1 has a detachable cartridge type water tank 2 and a coffee bean storage and cutter mill container 4 having a cutter 3.
A motor 5 for driving the cutter 3 to rotate;
A heating means 6 comprising a heater, a coffee container 7 placed on the upper surface of the heating means 6, and a coffee container A which receives the coffee powder A pulverized by the cutter 3 in the mill container 4. −
A coffee liquid extraction container 8 for extracting a coffee liquid, one end of which is connected to the water tank 2 and an intermediate portion thereof is heated by the heating means 6 and the other end faces the upper surface of the coffee liquid extraction container 8. A hot water supply pipe 9 and a rotating plate 10 with a hole axially mounted on the rotating shaft of the motor 5 for detecting the rotation speed of the motor 5 are separated by a gap. A rotation speed detecting means 12 is provided which comprises an optical sensor 11 such as a photo-interrupter and generates one detection pulse for one rotation of the rotating shaft.

FIG. 2 is an electric circuit block diagram of a main part showing an outline of a control circuit 13 for controlling the motor 5 and for controlling an energizing time to the heating means 6 in a subsequent uneven process. The control circuit 13 has a detection signal input circuit 14 for shaping the detection signal of the rotation speed detection means 12 into a rectangular wave signal, and receives a signal from the detection signal input circuit 14 and detects the rotation signal by the rotation speed detection means 12. 400 rpm
When the number of revolutions per second (predetermined number) is reached, the motor 5 is stopped, and the energizing time of the heating means 6 in the subsequent unevenness step is set and controlled in proportion to the driving time of the motor 5. Operation control circuit 15 such as
A phase control circuit 16 including a triac for controlling the phase of the motor 5 based on a control signal from the arithmetic control circuit 15 and stopping the motor 5 based on a stop signal, and a control from the arithmetic control circuit 15 A heating means energizing circuit 17 for energizing the heating means 6 for a predetermined time by a signal;
Counter 18 for counting the number of rotations of the motor 5 every 5 seconds
And a motor control unit 19 that converts the counted number of rotations into a number of rotations per second and outputs a motor stop signal when the number of rotations per second reaches 400 rotations / second (a predetermined number). A drive time counting unit 20 for stopping the count simultaneously with the output of the motor stop signal and counting the motor drive time; An unevenness step energizing time setting unit 21 that sets the heating means ON signal for the energizing time and sets the heating time ON time, and a heating unit energizing control unit (FIG. 1) that supplies hot water continuously to the coffee powder after the end of the unevenness step. (Not shown).

The driving time setting unit 2 for the driving process
In FIG. 1, as shown in FIG. 3, the heating time in the mura processing step is such that when the driving time of the motor 5 is 7 seconds to 15 seconds, the driving time is 7 seconds and the heating unit 6 energizing time is 35 seconds.
Seconds, the drive time is 15 seconds and the heating means 6
The energization time is set so as to increase in proportion to the increase in the drive time so as to be seconds. Further, when the driving time of the motor 5 is 0 to 7 seconds, the energizing time of the heating means 6 is uniformly 35 seconds, and when the driving time is 15 seconds or more, the heating means 6 is heated.
The energization time is uniformly set to 55 seconds.

Further, the motor 5 is set to stop when the number of revolutions detected by the revolution number detecting means 12 reaches 400 revolutions / second (predetermined number) for the following reason.

That is, the magnitude of the load applied to the motor 5 varies depending on the amount, type, hardness, and power supply voltage of the coffee beans to be ground. In any case, when the coffee beans are ground into coffee powder. The load of the motor 5 is reduced and the number of rotations rises. As shown in FIG. 4 [motor rotation number-crushing time characteristic diagram by load (1 cup to 5 cups)], one cup of coffee beans ( 8 grams),
2 cups (16 grams), 3 cups (24 grams), 4
Approximately 300 cups (32 grams) or 5 cups (40 grams) when grinding coffee beans
The rotation speed changes around the rotation speed / second, and when the grinding is completed, the rotation speed is increased to approximately 450 rotations / second. In any case, the rotation speed becomes 400 rotations / second. This is because if it passes, it can be considered that the pulverization has been completed.

Then, with this configuration, coffee beans are first put into the mill container 4, water is put into the water tank 2, and then a start key (not shown) is pushed. As a result, the coffee beans are pulverized by the cutter 4 which is rotated by the drive of the motor 5 to become coffee powder.
2 through a coffee liquid extraction container 8 having a paper filter 23.

At this time, the rotation speed of the motor 5 is detected by a rotation speed detecting means 12, and the detected rotation speed is sent to a control circuit 13, which controls the control circuit 13.
When the number of revolutions of the motor 5 reaches 400 revolutions / second (predetermined number), the motor 5
This stops the rotation of the motor. When the coffee beans are ground into coffee powder regardless of the amount, type, hardness and power supply voltage of the coffee beans to be ground, the motor 5 is stopped. The idling time of the subsequent motor 5 is eliminated, thereby eliminating the generation of noise.

Thereafter, the process shifts to the washing process. At this time, the heating means 6 is energized for an energizing time set in proportion to the driving time of the motor 5, so that an appropriate amount of coffee powder can be selected. Murashiri is performed.

Thereafter, the water in the hot water supply pipe 9 is heated by the heating of the heating means 6, and the hot water is dropped and supplied to the coffee liquid extraction container 8 through the diffusion plate 24. The dropped hot water permeates the coffee powder A in the coffee liquid extraction container 8 to extract a coffee extract from the coffee powder A, is filtered by a paper filter 22 and is dropped in the coffee container 7 as coffee liquid, and is stored. Is done. At this time, since the sufficient unevenness is performed by the unevenness step, the coffee extract can be sufficiently extracted, and a delicious coffee can be obtained.

[0018]

The coffee-boiler with a mill according to the present invention has the following effects because it is constructed as described above.

That is, the rotation speed of the motor driving the cutter is detected by the rotation speed detecting means, and the detected rotation speed is
Since the motor is stopped when the coffee beans are crushed into coffee powder and rise and reach a predetermined number, the coffee beans are irrespective of the amount, type, hardness and power supply voltage of the coffee beans to be ground. The motor is stopped when the coffee grounds are ground to form coffee grounds, so that there is no idle time after the coffee beans are ground, so that no noise is generated and the coffee beans can be ground quietly.

Further, the energizing time of the heating means in the unevenness step is set in proportion to the drive time of the motor, so that an amount of hot water corresponding to the amount of coffee powder is supplied, thereby providing sufficient unevenness. In this way, the coffee extract is sufficiently extracted to obtain a good coffee.

[Brief description of the drawings]

FIG. 1 is a side sectional view of an embodiment of a coffee kettle with a mill according to the present invention.

FIG. 2 is an electric circuit block diagram of the main part.

FIG. 3 is a characteristic diagram of a heating unit energizing time-motor driving time characteristic in the same unevenness process.

FIG. 4 is a graph showing the relationship between the number of rotations of the motor and the grinding time for each load (1 cup to 5 cups).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Coffee-boiler body with a mill 2 Water tank 3 Cutter 4 Mill container 5 Motor 12 Rotation speed detection means

Continuation of the front page (56) References JP-A-63-19116 (JP, A) JP-A-63-89125 (JP, A) JP-A-57-110218 (JP, A) , U) (58) Fields investigated (Int. Cl. ⁶ , DB name) A47J 31/00-31/60

Claims (1)

(57) [Claims] 1. A water tank for storing water, a mill container for storing coffee beans and having a cutter for crushing the coffee beans, a motor for driving the cutter, and coffee powder crushed by the cutter. Heating means for heating the water from the water tank to supply hot water to the water, rotation number detection means for detecting the rotation number of the motor, and when the rotation number detected by the rotation number detection means reaches a predetermined number. Control to stop the motor and set the energizing time of the heating means in the subsequent unevenness step in proportion to the driving time of the motor within a range not exceeding the unevenness step.
Coffee boiling and-charged mill, characterized in that and means.