JPH07108265B2 - Bread maker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is mainly used for automatically performing a bread making process such as kneading, fermentation and baking when ingredients such as wheat flour, sugar, yeast and water are added. To household bread maker.

[Conventional technology]

The above-mentioned kneading, fermentation, baking process such as baking is, so to speak, flour, sugar, butter, since it is a process utilizing chemical changes of materials such as yeast, the temperature when performing each process,
It is desirable that the temperature be as close as possible to the optimum temperature for each process in order to obtain bread with good flavor and good shape.

For example, a dough temperature of 27 to 28 ° C is preferable in order to promote the formation of gluten produced from the protein of wheat flour in the kneading process, or the oven internal temperature is 200 in the baking process.
It is preferable that the temperature is about ° C.

In order to meet the above requirements, the conventional device has a temperature sensor inside or outside the oven that detects the temperature near the bread material, and the detected value of the current temperature from this sensor is fed back to the microcomputer installed in the bread maker. hand,
The operating ratio (heater duty) of the heater for heating was changed sequentially.

For example, the value of the dough temperature detected in the kneading process is 30 ℃
If it is, it is higher than the proper temperature of 27 to 28 ° C, so that the operation rate of the heater is lowered, and if it is 25 ° C, the heater operation rate is increased to perform feedback control.

[Problems to be Solved by the Invention]

However, in order to perform the above-mentioned control, the circuit in the microcomputer becomes complicated and costly, and in order to truly obtain the accuracy of the above-mentioned control, a plurality of temperature detection sensors are required, Therefore, there is a drawback that the circuit is more complicated and the cost is higher.

That is, for example, the kneading process, the size of the dough in the fermentation process, the position and the size of the material in the baking process, different from the position, the most preferable temperature measurement position in these processes is different by itself, Providing a sensor increases the cost.

When the number of sensors is omitted and only one sensor is used, the detected temperature is
When the feedback control as described above is performed, the operating rate of the heater vibrates and is not stable because the temperature at the shifted position does not stabilize, and the temperature of the bread dough and bread ingredients becomes an environmental temperature that is not defective. There is.

The present invention is intended to solve the above drawbacks.

[Means for Solving the Problems]

The present invention provides a bread maker having a control microcomputer mounted thereon, comprising storage means for storing a plurality of patterns of heater operation rates which are predetermined so as to keep the process temperature in each of the bread making processes constant. Is selected from the plurality of patterns and executed according to at least one actuation rate pattern.

In addition, the plurality of patterns is set to a pattern set according to the high or low of the temperature, and the sensor automatically measures the temperature during driving, or the number of the patterns is reduced from the plurality of patterns based on the temperature value measured by the user. Both may automatically select one corresponding temperature pattern.

[Work]

The user confirms the outside air temperature with a thermometer or the like, and the user switches the selection means according to the value of the outside air temperature to select at least one of a plurality of patterns stored in advance.

When the bread making process is started, the heater operation rate is changed based on the selected pattern.

When a sensor for detecting the temperature is provided, at least one pattern for the corresponding temperature is automatically selected from the plurality of patterns based on the value of the temperature detected by the sensor.

〔Example〕

FIG. 1 is a schematic vertical cross-sectional view of a bread maker according to the present invention. The material kneading device (3), the heater (4), and the microcomputer device (15) for controlling the kneading device (3) and the heater (4).

The material kneading device (3) includes an arm (6) that rotates through the bottom of the container, a belt pulley mechanism (7) that transmits drive to the arm (6), and an electric motor (8).

(9) is a partition wall forming an oven.

The microcomputer device (5) normally consists of hardware such as a CPU and ROM, RAM, etc., and in the ROM the ideal oven temperature is set according to the difference in outside air temperature during each bread making process that was set by measurement in advance through experiments. The duty of the heater (4) for realizing is stored.

That is, in the bread maker of this example, the first kneading step (I) and the rest (II) for promoting the formation of gluten
The second kneading process (III), which is held between the two, and the first and second
It has a fermentation process (IV) (V), a baking process (VI), and a heat retention process (VII) that keeps a constant temperature to prevent the last condensation (Fig. 2), but the first kneading process (I) ) To the first fermentation step (IV), as mentioned above, 27-28 ℃ is good,
As a result of the experiment, for example, when the outside air temperature is 10 ° C, the predetermined temperature is obtained with a heater duty of 10%, and when the outside air temperature is 20 ° C, the predetermined temperature is obtained with a heater duty of 8%. In the storage means (10), “10” is stored as the operating rate (heater duty) for 10 ° C., and “8” is stored as the operating rate for 20 ° C.

Similarly, the heater duty for each temperature in each stroke of the result of the experiment is stored in the storage means (10).

That is, the heater duty value is graphed and shown in FIG.

In FIG. 2, the horizontal axis represents time, the right vertical axis represents heater duty, the left vertical axis represents oven temperature, the solid line represents the ideal temperature to be the target in the oven in each stroke, and the dashed line represents the ideal temperature. The heater duty when the room temperature is 10 ° C, the dotted line shows the heater duty when the room temperature is 20 ° C, and the two-dot chain line shows the heater duty when the room temperature is 25 ° C.

Therefore, in this example, the one-dot chain line, the dotted line, and the two-dot chain line show the first to third actuation rate patterns (P1) (P2) (P3).

Moreover, in this example, a sensor (11) for detecting the outside air temperature.
And a means (12) for fetching a detection value from the sensor (11) and automatically selecting one of the first to third patterns based on the detection value in the microcomputer (5). Be prepared for.

That is, when the value of the outside air temperature detected by the sensor (11) is, for example, 12 ° C., the selecting means (12) selects the pattern for 10 ° C., which is the nearest set temperature (one-dot chain line in FIG. 2), The data of the operation rate pattern for 10 ° C in the storage means (10) is moved to an appropriate area in the RAM (13), and the start switch (1
After 4) is pressed by the user, the heater (4) operates by changing its duty based on the data transferred into the RAM (13).

Explaining the heater duty here, as shown in Fig. 3, the heater duty is the ratio of the ON and OFF currents supplied to the heater (4) to the ON time plus the OFF time, that is, the ON time to the total time. For example, the (A) part in FIG. 3 has a duty (actuation ratio) of 50%, and the (B) part has a duty (actuation ratio) of 67%.

Reference numeral (15) in FIG. 1 is a driver for specifically changing the ON / OFF interval of the heater based on the data in the RAM (13).

Therefore, in the bread maker of this example, when the start switch (14) is pushed after the predetermined material is put in the container (2), the temperature at that time is detected by the sensor (11), and the detected value is detected. The fetching selection means (12) selects any one of the plurality of patterns in the storage means (10).

Then, the heater (4) is operated and other means such as the material kneading device (7) are operated in accordance with the selected operation rate pattern (for example, the one-dot chain line in FIG. 2).

As described above, since the heater duty in a certain process is determined in advance by the pattern, the heater duty value vibration that is apt to occur in the feedback control does not occur, and stable heater heating is performed.

In the above embodiment, the operation ratio patterns stored in the storage means (10) are three kinds, but of course, two kinds or four or more kinds may be used. The larger the number of patterns, the better the heat generation amount of the heater can be controlled.

In the above embodiment, the selection means (12) is the sensor (1
Although one operation rate pattern for the temperature closest to the detected temperature value of 1) is selected, at least two nearest patterns are selected by the selection means (12) as in the other example below, and these patterns are also selected. Based on the data from
It is also possible to calculate a more accurate heater operation rate in each stroke.

That is, as shown in the block diagram of the microcomputer (5) in FIG. 4, the selection means (12) selects the nearest 2 from the storage means (10) based on the temperature value detected by the sensor (11). Select one activation rate pattern. For example, when the temperature value is 15 ° C., the pattern for 10 ° C. (shown by a chain line) and the pattern for 20 ° C. (shown by a dotted line) in the second diagram are selected, and when the temperature value is 22 ° C. , Pattern for 20 ℃ and 25 ℃
And the pattern for.

Then, the data of the two selected patterns is temporarily stored in RAM (1
After moving to the inside of 3), this data is input to the next calculating means (16) in the microcomputer and processed so as to be more suitable for the detected temperature value.

That is, the calculating means (16) of this example is a kind of average value calculating means, for example, if the detected value is 15 ° C. and the selected pattern is for 10 ° C. and 20 ° C., this calculating means (1
In 6), calculate the intermediate value between the data for 10 ℃ and the data for 20 ℃, and if the detected value is 22 ℃ and the selected pattern is for 20 ℃ and 25 ℃, The calculation means (16) calculates the data at two-fifth points between the data for 20 ° C and the data for 25 ° C.

More specifically, in the above example, when the data for 10 ° C in the kneading process is “10”, the data for 20 ° C is “8”, and the data for 25 ° C is “3”, the detected value is 15 ° C. On the other hand, "9" is calculated, and "5" is calculated for the detected value of 22 ° C.

Then, the driver (15) is actuated based on the data calculated as described above, and the heater (4) is actuated at an actuation rate that correctly follows the calculated value.

Therefore, the calorific value of the heater (4) in each process becomes more appropriate and the ideal oven temperature can be realized.

Further, in the above embodiment, the detection value from the sensor (11) was input to the selection means (12) and the predetermined actuation rate pattern was automatically selected accordingly, but with the sensor (11) omitted, A switch (17) for manual switching is connected to the selecting means (12), and a user manually switches the switch (17) to select the operating pattern through the selecting means (12) according to the temperature during the operation. May be selected (FIG. 4).

[Effect]

As described above, the bread maker according to the present invention does not have the drawbacks mentioned at the beginning, the control circuit can be realized easily at low cost, and the temperature stability inside the oven is good.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing the structure of a bread maker according to the present invention, FIG. 2 is a view showing a plurality of operating rate patterns, FIG. 3 is an explanatory view of a heater duty, and FIG. 4 is another embodiment. 2 is a block diagram of the microcomputer in FIG. (P1) (P2) (P3) …… Pattern, (4) …… Heater,
(5) …… Microcomputer, (10) …… Storage means, (12) ……
Means of choice.

Claims (2)

[Claims] 1. A storage means for storing heater operation rates of a plurality of patterns predetermined to keep the process temperature constant in each process of bread making, and at least a bread making process selected from the plurality of patterns. A bread maker characterized by being executed according to one operation rate pattern. 2. The pattern according to claim 1, wherein the plurality of patterns are set according to the temperature level, and at least one actuation rate pattern is selected from the plurality of patterns based on the temperature during operation. Bread maker