JPH0411630Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention involves putting flour, water, yeast, etc. into a bread baking case, kneading the flour, etc. in the bread baking case, and causing primary fermentation and secondary fermentation. It relates to a bread maker that is used for later baking.

"Prior Art" Conventionally, bread makers have been developed that continuously perform kneading, fermentation, and baking of bread ingredients by controlling time and temperature.

"Problems to be Solved by the Invention" In the prior art, when a simple and commonly used integrated circuit is used, it is necessary to provide multiple temperature reference setting devices for performing multiple temperature measurements, and each It requires a driver such as a transistor to select the setting device, and it is not easy to reduce the number of electrical components such as the setting device and driver, and the setting of multiple reference temperatures and measurement of multiple temperatures are performed by arithmetic operations within the integrated circuit. This method requires the use of a special integrated circuit, which poses problems such as the difficulty in reducing the cost of a circuit that measures multiple temperatures.

``Means for solving the problem'' However, the present invention is equipped with a temperature sensor that detects the temperature of bread ingredients in the bread baking case and a bread adjustment circuit made up of a microcomputer. In a bread maker that performs continuous fermentation and baking by detecting an electrical resistance value and comparing it with a plurality of pre-stored temperature data to measure a plurality of temperatures, the temperature sensor and the bread adjustment circuit are connected to each other. The device is equipped with a constant capacity capacitor that is discharged at set time intervals, and a comparator that detects the completion of charging of the capacitor. By converting the temperature sensor, the time required to charge the capacitor is detected as an electrical resistance value of the temperature sensor.

``Operation'' Therefore, by simply installing a temperature measurement circuit to detect changes in the electrical resistance value of the temperature sensor, multiple temperatures can be properly detected and automatically detected using a control circuit composed of a simple commercially available integrated circuit. The bread making process can be carried out, and manufacturing costs can be easily reduced with a simple temperature measuring circuit structure.

"Embodiments" Hereinafter, embodiments of the present invention will be described in detail based on the drawings. Fig. 1 is a cross-sectional side view, and Fig. 2 is a plan view.The box-shaped main case 2 is supported by support legs 1, and the upper case 3 is fitted and fixed to one side of the upper surface of the main case 2, and can be opened and closed. Attach the lid 4 to the fulcrum shaft 3a of the upper case 3.

A base frame 5 is internally fixed to the bottom of the main body case 2, an inner case 7 is fixedly mounted on the base frame 5 via a bearing plate 6, and an annular heat ray radiant heater 8 is attached to the inner periphery of the inner case 7.

It also includes a cylindrical bread baking case 9 with an open top for introducing bread materials such as flour and yeast for kneading, fermentation, and baking, and a pair of locking pieces 10a that are engaged and released by rotation of the bread baking case 9. , 10b, the base plate 11 at the bottom of the bread baking case 9 is removably fixed to the bottom of the inner case 7 via the bearing plate 6.

Furthermore, a bearing part 12 is formed at the center of the bottom of the bread baking case 9, and an upper rotating shaft 14 is supported on the bearing part 12 via a metal 13.
The stirring motor 15 is fixedly installed on the top, and the output shaft 18 of the stirring motor 15 is interlocked and connected to the lower rotating shaft 19 of the bearing plate 6 through the belt 16 and pulleys 17a, 17b, while the lower end of the upper rotating shaft 14 and the lower rotating shaft are interlocked. axis 1
Clutch bodies 20a and 20b that can be freely engaged and disengaged from the upper end of 9.
are engaged and connected. Further, the shaft portion 22 of the stirring blade 21 is fitted from above to the upper end of the rotating shaft 14 having a D-shaped end face, and the stirring blade 22 is attached to the bottom of the bread baking case 9.
1 is installed internally.

Furthermore, the upper surface of the upper case 3 and the upper surface of the lid 4 are made approximately at the same height, and a glass window 23 having a spherical convex shape and a heat reflective film formed on the inner surface is provided at the center of the lid 4, and the inner surface of the lid 4 other than the glass window 23 is heated. The reflector plate 24 is stretched over the top of the bread baking case 9, and the top end of the bread baking case 9 is projected outward from the top opening of the main body case 2, and the top end of the bread baking case 9 is covered by the spherical surface of the heat reflector 24 inside the lid 4. At the same time, an intake hole 26 is formed on the side surface of the lid 4 via an intake guide 25,
A blower guide 29 is fixed inside the upper case 3, a blower motor 30 and a blower fan 31 are provided inside the main body and the upper cases 2 and 3, and the blower fan 31
The air from the intake guide 25 is passed through the air blowing guide 29.
It is configured such that the bread baking case 9 is fed out through the opening toward the upper surface of the bread baking case 9.

In addition, an air guide plate 32 is provided at the outlet of the intake hole 26 so that the air from the fan 31 is blown toward the inside of the baking case 9, and a blow guide plate 32 is provided at the outlet of the air intake hole 26 to prevent hot air and water vapor from the baking case 9 side from flowing in the direction of the fan 31. A backflow prevention plate 33 is provided at the entrance of the intake hole 26 to prevent
The structure is such that the prevention plate 33 is opened by the wind pressure of the fan 31 to blow air.

Furthermore, a dough sensor 34 is provided on the bottom surface of the bread baking case 9 in which the stirring blade 21 is disposed, eccentrically with respect to the center of rotation of the stirring blade 21.
1, the heat conductive detection window 36 is fixed to the bottom of the bread baking case 9 via the insulating resin body 35, and the dough sensor 34 is pressed against the detection window 36, which is projected into the bread baking case 9, from below the bottom so that it can rise and fall freely. I support it.

Furthermore, the clay-like bread material (dough) is
A protrusion 38 is fixed to the inner side surface of the firing case 9 to prevent the firing case 9 from rotating, the outer periphery of the inner case 7 is surrounded by a heat insulator 39, and an operation panel 40 is attached to the front surface of the main case 2.

An oven sensor 41, which is a temperature sensor, is fixed to the main body case 2, and the operation panel 40 includes a menu switch 42 for selecting the type of bread (white bread, French bread, etc.), and a menu switch 42 for setting the baking time of the bread. It includes reservation switches 43 and 44 for setting the time and minutes, a cancel switch 45 for resetting those initial settings, and a start switch 46 for starting bread making. Each of the switches 42 to 46 is connected to a pan adjustment circuit 47 composed of a microcomputer, and a seven-segment display 48 for displaying time and warning errors is connected to the circuit 47. 34 and 41 are connected to the circuit 47 via a changeover switch 67, and the changeover switch 67 is automatically changed over according to the timer output of the circuit 47 to input and connect each sensor 34 and 41 according to the bread making process. It is configured as follows.

Further, a thermostat 49 is connected as an input to the circuit 47, and the thermostat 49 is a means for detecting whether or not the inside of the inner case 7 constituting the oven is below the yeast killing temperature (approximately 60°C).
After the bread making reservation operation and before the start of the bread making operation, an alarm such as an error display and the interruption of the bread making operation are performed based on the excessive temperature output from the thermostat 49, while the thermostat An alarm such as an error display is issued based on the excessive temperature output from the tatto 49, and when baking bread continuously, the bread ingredients and yeast are added after the inside of the baking case 9 has cooled down to prevent the yeast from dying due to high temperatures. It is configured as much as possible.

Also, a relay 5 connected to the bread preparation circuit 47
This power is applied to the stirring motor 15 via a normally open relay switch 51 of 0.0, and a current sensor 52 detects the application of power to the heater 8 by the current flowing through the heater 8. A triax 53 that prevents the operation of the heater 8; and a relay 54 that is a control means that turns off the heater 8 when the heating operation signal from the bread preparation circuit 47 is off and current is flowing through the heater 8. and a normally closed relay switch 55 of the relay 54 and the triax 5.
This power is applied to the heater 8 via the heater 3.

Further, a blower motor 30 is provided via a normally open relay switch 56 of a relay 55, and a buzzer 58 is output connected to the adjustment circuit 47 via an amplifier 57.

Furthermore, the power supply voltage (+
The bread preparation circuit 47 is equipped with a voltage monitoring circuit 59 that detects when the voltage (+5V) drops due to a power outage, etc., and detects the voltage (+4.7V) to prepare for low current consumption operation.
The H level output from the monitoring circuit 59 is applied to the monitor circuit 59. Then, the output terminal P1, which produces an L level output at the end of the interrupt (NMI) control of the adjustment circuit 47, is connected to the standby terminal (STBY) of the adjustment circuit 47, and after the interrupt (NMI) processing is completed, low current consumption operation is prepared. (standby mode), and is configured to prevent the device from entering standby mode before interrupt (NMI) processing is completed, even if the time for the power supply voltage to drop changes due to load current, etc.

In addition, a monitoring timer 60, which is a control circuit that starts low current consumption operation only when the preparation for low current consumption operation is completed and the voltage drop continues, is provided, and a monitoring timer 60 is provided, which is a control circuit that starts low current consumption operation only when the preparation for low current consumption operation is completed, and the voltage (+4. 5V)
Below, the L level output from the monitoring circuit 59 is applied to the monitoring timer 60. Then, the output of the timer 60 is connected to the reset terminal (RESET) of the bread preparation circuit 47 via the delay circuit 61 and the backup capacitor 62, and the timer 60 allows the preparation circuit 47 to return to normal in response to a temporary voltage drop. This is to continue the bread making operation, for example, an interrupt (NMI) due to a temporary voltage drop (+4.6V)
Only processing is performed, and there is also a temporary voltage drop (+
4.4V), only interrupts (NMI) and standby mode processing are performed, eliminating the problem of stopping the CPU operation of the adjustment circuit 47, allowing normal recovery even after standby mode processing, and preventing noise and temporary It is possible to prevent the bread making operation from being stopped due to a voltage drop, and it is also possible to eliminate the problem that the timing of preparation for low current consumption operation changes depending on the load current. ) is operated in a low current consumption operation, and when the power is turned on again, the bread making operation is performed from the state before the power outage.

Further, the oven sensor 41 is connected as an input to the adjusting circuit 47 via an integrator 63 and a comparator 64, and a transistor 65 is connected to the adjusting circuit 47, which is turned on by the output T of the adjusting circuit 47 at preset intervals. The discharged capacitor 66 is charged by the current from the oven sensor 41 from the integrator 63, and when charging is completed, the comparator 6
By converting the output of 4 to low or high, the time required to charge the capacitor 66 is detected as the electrical resistance value of the temperature sensor 41,
The adjustment circuit 47 is configured to perform a plurality of temperature measurements in comparison with a plurality of temperature data (the time required to charge the capacitor 66 with the current from the sensor 41 when the temperature is set) stored in advance in the adjustment circuit 47. ing.

This example is constructed as described above, and bread ingredients such as flour, yeast, seasonings, butter, and water are introduced in the state shown in Figure 2. Baking powder is placed above the flour, and baking powder In addition to adding water to prevent the yeast from getting wet, the bread baking time and other settings can be set by operating the switch on the operation panel 40. The heater 8 is operated intermittently to maintain the temperature at t1 degrees or higher based on the output of the oven sensor 41 to prevent yeast from dying.

In addition, the bread making operation is started about 4 hours in advance by calculating backwards the time required for bread baking from the bread baking time, and the stirring motor 15 rotates the blades 21 to knead the bread ingredients in the baking case 9. At the same time,
Air is sent into the baking case 9 by the ventilation fan 31, and the air is sent into the baking case 9 based on the dough sensor 34 output.
The temperature inside was maintained at t2 degrees, and the first stirring for m1 hours, the rest for m2 hours, and the second stirring for M1 hours were performed.

Then, it is maintained at t3 degrees based on the output of the oven sensor 41, fermentation for M2 hours and rounding process for m3 hours are performed, and after the waiting time for M3 hours has passed, rounding for m4 hours and roasting process for M4 hours are performed. Something,
In the process from preheating to roasting, we confirm that the temperature is below t4 degrees based on the output of the thermostat 49, and when the oven temperature rises above the temperature that kills the yeast, an error message is displayed and the bread baking machine is activated. Stop the operation.

Then, until the fabric sensor 34 detects t5 degrees,
Or turn on heater 8 until the baking time of M5 hours has elapsed.
The oven sensor 41 output is activated to bake the bread, and the fan motor 31 is activated to cool the bread for M6 hours, and when the bread production is completed, the buzzer 58 is activated. The capacitor 66 is charged at regular intervals, and the time required to charge the capacitor 66 is compared with the temperature data of the adjustment circuit 47.
It detects multiple internal temperatures t1, t3, t7 and automatically performs bread fermentation and baking operations continuously.As shown in Figure 5, when comparing the set temperature, T1, y, m , x are fixed, oven sensor 41 resistance value = {240-y}/{16(10+m)-x}
In the diagram below, it is possible to determine whether the temperature is high or low based on the output of the comparator 64 at a point.

In addition, after the bread is baked and the interior of the inner case 7 is dehumidified by air blowing from the fan motor 31, the operation of the oven heater 8 is controlled to keep the bread at a temperature t4 about body temperature for a certain period of time M7. While preventing cooling, the warming operation can be performed manually by pressing the reservation switches 43 and 44 at the same time, and automatic and manual warming operations are automatically stopped before the quality of the bread deteriorates. After the bread making operation is completed, a heat retention operation is performed to maintain the set temperature for a set time.

Furthermore, as shown in the flowchart of FIG. 6, the menu switch 42 is operated to select the "notification timer" operation, the reservation switches 43 and 44 are operated to set the hours and minutes, and the start switch 46 is operated to start the preparation. The circuit 47 performs only the timekeeping operation, and when the set time elapses, a buzzer 58 is activated to issue a time signal.It is provided with a means for activating only the timer function by switching the menu switch 42, and a baking reservation switch 43, By activating the baking alarm buzzer 58 after the set time has elapsed without performing the bread-making process by setting the time in step 44, it can be used independently as a timer at times other than the bread-making process without the need for a special switch. be.

"Effects of the Invention" As is clear from the above embodiments, the present invention includes a temperature sensor 41 that detects the temperature of the bread ingredients in the bread baking case 9, and a bread adjustment circuit 47 composed of a microcomputer. In a bread maker that continuously performs fermentation and baking, the electric resistance value of the temperature sensor 41 is detected and compared with a plurality of pre-stored temperature data to measure a plurality of temperatures. A constant capacity capacitor 66 that is discharged at set time intervals and a comparator 64 that detects the completion of charging of the capacitor 66 are provided between the pan adjustment circuit 47 and the capacitor 66 after being discharged by the current from the temperature sensor 41. By charging the capacitor 66 and switching the output of the comparator 64 when charging is completed, the capacitor 6
6 is detected as the electrical resistance value of the temperature sensor 41.
By simply installing a temperature measurement circuit to detect changes in electrical resistance, a control circuit consisting of a simple commercially available integrated circuit can appropriately detect multiple temperatures and automatically perform the bread-making process. This provides practical effects such as the ability to easily reduce manufacturing costs with a simple temperature measuring circuit structure.

[Brief explanation of the drawing]

Fig. 1 is a control circuit diagram of the main part showing one embodiment of the present invention, Fig. 2 is an overall diagram, Fig. 3 is a partial diagram, Fig. 4 is a timing chart of bread making operation, and Fig. 5 is an output line. Figure 6 is a flowchart. 9... Bread baking case, 41... Oven sensor (temperature sensor).

Claims (1)

[Scope of utility model registration request] It is equipped with a temperature sensor 41 that detects the temperature of the bread ingredients in the bread baking case 9, and a bread adjustment circuit 47 composed of a microcomputer, and detects the electrical resistance value of the temperature sensor 41 at each set time and stores it in advance. In a bread maker that continuously performs fermentation and baking by measuring multiple temperatures in comparison with multiple temperature data, a constant voltage discharging operation is provided between the temperature sensor 41 and the bread adjustment circuit 47 at set time intervals. A capacitor 66 having a capacitance and a comparator 64 for detecting the completion of charging of the capacitor 66 are provided, and the capacitor 66 after being discharged is charged by the current from the temperature sensor 41, and the output of the comparator 64 is switched when the charging is completed. , the time required to charge the capacitor 66 is determined by the temperature sensor 4.
A bread maker characterized in that an electrical resistance value of 1 is detected.