JPH0238210B2 - CHORIKI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooking appliance such as a food processor.

Conventionally, in this type of cooking appliance, a reset type thermal protector for preventing the motor from overheating is connected in series with the motor. Therefore, a thermostat with a large contact capacity is required to interrupt the circuit when the motor temperature rises, which increases cost and requires the use of a thermostat with a limited service life. Further, if the device becomes inoperable because the resettable thermal protector is open, the condition cannot be known unless some means is used, which is extremely inconvenient in use.

The present invention has been made in view of these points, and includes a thermal protector that operates to stop the motor when the motor overheats, and a thermal protector that operates to stop the motor when the motor overheats.
And it can be extremely small and small capacity.
Furthermore, it is an object of the present invention to provide a cooking appliance in which its operation can also be displayed in conjunction with a safety switch.

The present invention uses a reset type thermal protector as a member that cuts off power to the motor when the motor overheats, so that both operations are possible without any special operation when the normal state is restored.Furthermore, the reset type thermal protector Since the insertion position is on the control line that drives and controls the motor and is not a part where a large current flows, it should be small and have a small capacity, and be connected to the display in connection with the safety switch. The structure is such that it is possible to display whether the contact of the thermal protector is the contact of the reset type thermal protector.

An embodiment of the present invention will be described based on the drawings.
First, a container 3 with an upward opening is attached to a mounting portion 2 formed on a main body case 1 . and,
A lid 4 that closes this container 3 is detachably attached. Further, a motor chamber 6 in which a commutator motor 5 is housed is vertically formed next to the mounting portion 2 . A cutout 7 is formed in the upper side of the motor chamber 6 facing the container 3, and a safety switch 8 is provided inside the cutout 7. A switch piece 9 for opening and closing the safety switch 8 is formed on a part of the circumferential side of the lid 4. Here, container 3 and lid 4
In the normal lock-set state, the switch piece 9 is positioned with respect to the safety switch 8 at the position shown by the solid line in FIG. 3, and is positioned by a locking mechanism (not shown) to close the safety switch 8.
When the safety switch 8 is deviated from the normal lock position, the safety switch 8 opens as shown by the dashed line in FIG. A return type thermal protector 34 is attached to the motor 5.

Further, a gear 1 is attached to the motor shaft 10 of the motor 5.
1 is fixed, and intermediate gear 1 is connected to this gear 11.
a drive shaft 14 having a gear 13 meshing through 2;
is provided to protrude from the mounting portion 2.
A cutting blade 15 for cutting the food to be cooked is detachably attached to the drive shaft 14 in the container 3.
is provided. Various types of cutting blades 15 are selected and used depending on the type of cooking.

A display section 16 and an operation section 17 are provided on the bottom front surface of the main body case 1. first,
The display part 16 is a 7-segment LED 18 for 4 digits.
The first and second digits from the left indicate the time in seconds, and the third digit indicates whether safety switch 8 is on or off.
When it is OFF, it indicates that it is ready for operation, and the fourth digit indicates the operating speed level. Further, as shown in FIG. 5, the PC board 20 having the LED 18 is fixed to a decorative plate 19 provided to fit the front opening of the main body case 1. A transparent display board 21 is fixed to the decorative board 19 so that the lighting state of the LED 18 can be seen through the display section 16.
On the other hand, the operation unit 17 has a plurality of keys, from the left, a key 22 for setting the operating time in units of 10 seconds ("x10"), a key 23 for setting the operating time in units of 1 second ("x1"), Multiple predetermined operating speeds (in this example, stop speed "0" and "1" to "6"
It consists of a key 24 for setting (stage), an auto pulse key 25 for intermittent operation every 2 seconds, a clear key 26, and a start/stop key 27 that also serves as a start/stop function. Looking at its specific structure, for example, the start/stop key 27, as shown in FIG. an insulating spacer 31 that maintains the distance between the conductive parts so that they can be freely connected and separated;
It is provided with the intervention of. The same applies to other keys 22 and the like. A flexible cover 32 such as a polyester sheet is provided on the entire front surface of the decorative plate 19. This cover 32 is bonded with an adhesive except for the display section 16, and the surface thereof has required printing corresponding to the display section 16 and the operation section 17, as shown in FIG. By providing such a cover 32, it is possible to completely prevent water from entering the precise key group for this type of cooking device that requires the use of water, and electrically connect the outside and the inside. It is completely insulated and can prevent short circuit accidents.

Next, the control circuit for the motor 5 will be explained with reference to FIG. First, the motor 5 connects the commercial AC power supply 33 to the safety switch 8 and the triator 3.
It is connected with 5. Further, a diode 36, resistors 37 and 38, and a Zener diode 39 are connected in parallel to the safety switch 8, motor 5, and triax 35. A smoothing capacitor 40 is connected in parallel to the Zener diode 39, and a smoothing capacitor 41 is also connected in parallel to the Zener diode 39 and the resistor 38, and is controlled by the Zener voltage of the Zener diode 39. A power supply voltage V _DD for the circuit, that is, for the microcomputer μCPU 42 is created.

Here, the motor 5 has a brake coil 43.
One end of this brake coil 43 is connected to the OFF terminal A of the safety switch 8, and the other end is connected to an intermediate point between the armature 44 and the field coil 45. The other end of this field coil 45 is connected to the triac 35 via another field coil 46.
Further, the remaining brushes of the armature 44 are connected to the common terminal C of the safety switch 8. The ON terminal B of the safety switch 8 is connected to the AC power supply 33.
It is connected to the.

On the other hand, a return type thermal protector 3 attached to the motor 5 is connected to the common terminal C of the safety switch 8.
A resistor 47 and diodes 48 and 49 are connected through a resistor 4, and a power supply frequency signal V _SIG is taken out. This power supply frequency signal V _SIG is passed through a diode 50 to the K ₅
input to the terminal. That is, from the voltage waveform of the AC power supply 33 shown in FIG. 8a, the diode 48
The negative power supply voltage is taken out from the voltage V _SS as shown in figure b, and the diode 49 is used to obtain the negative side power supply voltage as shown in figure b.
As shown in the figure, the positive side power supply voltage is extracted from the power supply voltage _VDD , and the two are combined to form the power supply frequency signal V _SIG as shown in the figure d. Then, the diode 50 cancels the voltage drop of the diode 48 on the positive side of the voltage V _SS and transfers the voltage to the μCPU 42.
Input it to the _K8 terminal of the µCPU42 and adjust it so that it does not exceed the power supply voltage of the μCPU42.

Also, looking at the μCPU 42, first of all, the capacitor 51 between the V _SS terminal and the OSC ₂ terminal, and the capacitor 51 between the OSC 1 terminal and the OSC ₂ terminal
A built-in oscillator is caused to oscillate by a semi-fixed resistor 52 between the V _DD terminals, and a clock signal is given to the μCPU 42. And the INIT pin is the power supply voltage
The μCPU 42 is cleared when V _DD is at H level, and the program is executed when it is at L level. Therefore, when the power is turned on, the H level is held, and during that time, the program counter is preset to bring the output to the L level.In order to make the output go to the L level later than the power supply voltage V _DD , an electrolytic capacitor is connected between the INIT and V _SS terminals. 53 is connected. This electrolytic capacitor 53 prevents an unexpected program from being executed during the rise of the power supply voltage _VDD . The collector of a PNP type transistor 54 is connected to the negative side of the electrolytic capacitor 53, and its emitter is connected to the V _SS terminal.
The collector of a PNP type transistor 55 is connected to the base. The collector of this transistor 55 is connected to the _VDD terminal via a resistor 56,
On the base side, there are resistors 57 and 58 that divide the voltage (V _DD '-V _SS ) between the resistors 37 and 38.
is connected. As for the input relationship of the μCPU 42, signals from the keys 22, 23, and 24 are input to the _K1 terminal, signals from the key 25, clear key 26, and start/stop key 27 are input to the _K2 terminal, and _K4 terminal has 50Hz, 60
A signal from a Hz changeover switch 59 is input. This changeover switch 59 is for 50Hz, and when it is closed and the voltage V _SS is input, a 50Hz program is executed. Also, regarding the output relationship of the μCPU 42, the signals from the O ₀ to O ₆ terminals are transmitted to the transistors 60, 61, 62, 63, 64, 65, 66.
It has been added to the Emitsuta side. This causes transistors 60 to 66 to be driven to LED1.
Appropriate current is applied to the 7 segments of 8, and the μCPU42
The output from the R ₀ to R ₃ terminals of the transistor 6
7, 68, 69, and 70, the LED 18 is turned on for each digit by drawing current for each digit one after another. The signal of R ₀ terminal is key 22,
Similarly, the signal from the R ₁ terminal is applied to the key 23 and the start/stop key 27, and the signal from the R ₂ terminal is applied to the key 24 and the clear key 26, respectively. Furthermore, the _R5 terminal is connected to the piezoelectric buzzer 7.
The piezoelectric buzzer 71 generates an output for 1 through the transistor 72, and makes the piezoelectric buzzer 71 sound for a short time when a key is pressed or when the timer ends. Then, the signal from the _R7 terminal is passed through the transistor 73 as a gate signal to the triac 3.
It is input to gate 5.

Therefore, in this circuit, the power supply voltage V _DD is created without using a transformer and with resistors 37,
Since the voltage is stepped down by 38, it can be made smaller. In this case, by dividing the resistors 37 and 38 into two and connecting the capacitors 40 and 41, the power supply voltage
The ripple on V _DD can be reduced more than when the capacitor 40 is inserted only in this. Since the voltage at the voltage dividing point of resistors 37 and 38 (V _DD '-V _SS ) is used as a signal for the discharging circuit formed by transistors 54 and 55, etc., the power supply
When turned off, a reliable and quick reset is possible.
Malfunction of the μCPU 42 can be reliably prevented even if the power is turned on again instantly. As a result, even in the event of an instantaneous grounding accident such as during a power outage, the motor 5, which had been rotating at a low speed, will not suddenly rotate at a high speed. That is, according to the power supply circuit, the voltage V _DD ' is normally maintained at a voltage more negative than the power supply voltage V _DD with respect to the voltage V _SS , and the divided voltage is applied to the base of the transistor 55 by the resistors 57 and 58. - By setting the voltage to be slightly lower than the saturation voltage between emitters, this transistor 55 is turned on and the transistor 54 is turned off, and the electrolytic capacitor 53 is electrically disconnected from this transistor 54, but the AC power supply 33 is The voltage before the supply voltage V _DD decreases
Since V _DD ' starts to decrease in voltage first, the base voltage of transistor 55 approaches voltage V _SS , and
This transistor 55 turns OFF and transistor 5
4 turns on, and in an instant, electrolytic capacitor 53
Discharge the charge and set the INIT terminal of μCPU42 to voltage
It will be pulled up to V _SS and a clearing operation will be performed.
Therefore, even if the power is turned on and off instantaneously, such as when cooking is finished, unplugged from the power outlet, and then restarted immediately, the μCPU 42 is cleared in an instant. Therefore, the program can be executed without causing the μCPU 42 to malfunction.

Regarding the safety switch 8, if the lid 4 is locked in the normal position, the motor 5 can be energized, and even if the lid 4 is energized, if the lid 4 is removed or moved from the normal position, the safety switch 8 will be activated.
Switched to OFF terminal A side, brake coil 43
and armature 44 are field coil 45,
It is a closed circuit connected in series without intervening 46, that is, a kind of short-circuited generator, and the rotation of the cutting blade 15 is immediately stopped under a large braking force. and,
From a circuit perspective, the safety switch 8 is independent from the μCPU 42 side, and when the safety switch 8 is turned OFF, the power to the motor 5 is cut off, the gate signal to the gate of the triax 35 is stopped, and the gate signal to the μCPU 42 is interrupted. The memorized timer time and driving speed remain as they are. In other words, the safety switch 8 is turned OFF while the lid 4 is removed.
The cooking time and speed can be set even in the current state, and the operation procedure is not limited, making it easy to use. If cooking is in progress, even if you remove the lid 4 and add more food, you can lock the lid 4 again and press the start/stop key 27.
By simply pressing , you can restart cooking with the previous setting information, and you can know the total cooking time without having to calculate it, so you can cook data without relying on intuition. The result is always the best cooked food. Furthermore, the ON/OFF signal of the safety switch 8 is taken out from the common terminal C on the current-carrying side of the motor 5, and is also used as the power supply frequency signal V _SIG for the timer and the ON/OFF signal of the safety switch 8. The power supply frequency signal V _SIG , which is susceptible to adverse effects such as surge noise and high frequency noise based on the AC power supply 33, is turned off when the safety switch 8 is turned OFF, eliminating malfunctions and preventing injury to the cook or against his will. The cutting blade 15 does not rotate and damage the food, so it is perfect. In addition, if the motor 5 overheats due to misuse, the reset type thermal protector 34 opens and the _K8 input signal V _SIG is not input to the μCPU 42, so the motor 5 stops, the ready-to-operate mark disappears, and the reset type thermal protector 34 opens. When the protector 34 returns, the memory is held, and when the ready-to-operate mark is displayed, cooking becomes possible by pressing the start/stop key 27. Therefore, unlike the motor current cutoff type circuit, the cooker does not rotate in an unoccupied room, causing food damage or injury.

Next, the program of this embodiment will be explained according to the flowcharts of FIGS. 9 to 11. First, when you turn on the power plug, the
RAM will be cleared automatically. The time setting is set to "C" which means continuous operation, and the operating speed is set to "0" from among the speeds of "1" to "6" and "0" which indicates no operation. . Next, check whether the _K4 terminal input is 50Hz or 60Hz, and if it is set to 50Hz, set the 50Hz flag. In this way, the initialization operation is performed.

Next, it is determined whether the lid 4 is locked, that is, whether the safety switch 8 is turned on, and if the safety switch 8 is turned on, the process moves to a 45 ms counter. Then, it is determined whether the count content of this 45ms counter is 45ms or more, and if it is not 45ms or more, it is determined whether the power supply frequency signal V _SIG to the _K8 terminal is at H level with respect to the power supply voltage V _DD or not.
Determine whether the level is Here, H level, H
Regardless of the level, it is determined whether the H level or L level is the first one. That is, zero crossings of the power supply waveform are detected as switching from H level to L level and from L level to H level for the _K8 terminal. In this case, if the level remains unchanged for the first time, the result of determining whether it is H level or L level is NO, and the half period of 50Hz is 10m.
The 45ms counter continues to count up beyond the 8.3ms half cycle of 60Hz, and when the count exceeds 45ms, the start flag is cleared and no lid is displayed while the time and speed are memorized. On the other hand, when there is a level change and the determination of the first H level or L level becomes YES, after clearing the 45ms counter, it is determined whether the start flag is 1, and if the start flag is not set, the LED 18 is displayed. Move on to the program. That is, a dynamic display operation is performed in which output is output from terminals O ₀ to O ₆ and output is output from terminals R ₀ to _{R 3} depending on the digit. In this case, R ₀ ~
The input signal to the _K1 terminal or _K2 terminal corresponding to the output of the _R2 terminal is stored in the RAM, and if there is a signal, the process moves to the key processing routine shown in FIG. 10, which will be described later. In addition to this dynamic display operation, the display by the LED 18 performs a lighting operation for four digits within a half cycle of the AC power source 33 by carrying up the lighting digit and performing a routine for determining whether four digits have been completed. By the way, when safety switch 8 is OFF, the distance is 9.2m.
It enters the s counter and is displayed in 4 digits within 9.2 ms, which is the intermediate value between a 50 Hz half cycle of 10 ms and a 60 Hz half cycle of 8.3 ms. When the 4-digit display has finished, the input prohibition counter counts each time the routine is run, and the interval between key inputs is
If it is 0.1s or more, a flag is set to remove the input prohibition, and if the piezoelectric buzzer 71 that sounds due to key input is not ringing, it will pass through as is, but if it is in the middle of ringing, the voltage buzzer 71 will clear the ringing in 15ms. do. Next, it is determined whether the start flag is 1, and if it is not set, it is determined whether it is the end buzzer. If the end buzzer is not sounding, the original safety switch 8 is ON. Return to determining whether there is one. These routines form a constant processing routine loop.

Next, the key processing routine will be explained with reference to FIG. In the above-mentioned constant processing routine,
After storing the input signal to the _K1 terminal or _K2 terminal corresponding to the output from the _R0 to _R2 terminals in the RAM during dynamic display operation, if there is a signal, the process moves to this key processing routine. When 4 is locked, the power supply frequency signal V _SIG that is always input to the _K8 terminal is omitted, the lid flag is set to 1, and the process returns to carrying the lit digit. Then, when there is an input to the _K1 or _K2 terminal, the key interval is checked to see if the input prohibition counter is released.
It is determined whether the input time is 0.1s or more, and if the input is prohibited, the input prohibition counter is cleared. On the other hand, if the input prohibition counter is released, it is determined whether the key press operation lasts for 30 ms or more. This determination is
In addition to the function of an input prohibition counter, this function is effective in preventing chattering of key inputs, uncertain key inputs, or noise entering the AC power supply 33. After that, if the key is operated for 30ms or more, a signal is output from the _R5 terminal and the transistor 7
The piezoelectric buzzer 71 is sounded by the drive No. 2. Next, it is determined whether the input is to the _K2 terminal or the _K1 terminal. Here, if the input is to the _K2 terminal, it is determined whether it is the key 25 for auto pulse. With this key 25, the pulse signal
After storing it in RAM, return to carrying the lit digit in the regular processing routine. If the signal is not from the key 25, it is determined whether it is the start/stop key 27, and if it is the start/stop key 27, it is further determined whether it is a start signal or a stop signal. do. If it is for a stop, clear the start flag, memorize the time, speed, auto pulse signal, etc. as they are, and return to carrying the lit digit. If it is a start signal, continuous operation "C"
Or, after confirming that the timer is set, set the start flag to 1. Note that the determination as to whether the key is for start or stop is made by distributing the signals of the start/stop key 27 alternately. Furthermore, if it is not the start/stop key 27, it is determined whether it is the clear key 26, and if it is the clear key 26, it returns to the start of the program, clears the RAM, and returns to continuous operation "C" and speed "0". Set.

On the other hand, when there is an input to the _K1 terminal, it is determined whether it is the "x10" key 22 for time setting, and if it is the key 22, the 1 on the display section 16 is displayed.
Carry up the digit. In other words, if the second digit is x, by operating the key 22, "0x"
T1x", "2x"..."9x", and after "9x" there is only "C" which is a continuous operation display, the second digit ("x1" digit) is memorized in RAM, and the next key 2
With 2 inputs, this second digit is recalled and becomes "0x". Also, if the key 23 is "x1" for time setting, the second digit ("x1" digit) on the display section 16
Carry forward sequentially. Furthermore, the key 24 for speed setting
If so, "0", "1" to "6" depending on the operation
It is incremented in order of "0"... and the speed is set. In this case, the firing angle constant corresponding to the set speed step is stored in the RAM. In this way,
A loop of key handling routines is formed.

Further, the ignition processing routine will be explained with reference to FIG. 9 together with the timer processing routine shown in FIG. 11. First, when the start flag is set, a determination is made as to whether or not a pulse is set by determining the start flag in the regular processing routine. Then, if the pulse setting is not set, it is determined whether the speed is "6", and if the speed is "6", it is 0.36
Applying a trigger pulse of ms to the triax 35,
The timer processing routine shown in FIG. 11 is called.
This timer processing routine uses the commercial power supply frequency of 50Hz or 60Hz; if it is 50Hz, 50 pulses are counted to make one second, and if it is 60Hz, 60 pulses are counted to make one second. do.
First, select the level of the power supply frequency signal V _SIG , and
At level, no timer processing is performed, and only at H level, timer processing is performed. In the case of H level, it is determined whether the 50Hz flag is set, and if it is set, it is 50Hz and the 50 counter is entered, and if it is not set, it is 60Hz and the 60 counter is entered and counted. When this count increases, it is counted by a 4-second repeat counter used for auto pulse or end buzzer. The process up to this point is carried out in the same way even if the continuous operation is set to "C", but if the timer is set, it is determined whether the end buzzer is being sounded. If the end buzzer is being sounded, return to the original routine; if not, subtract 1 second from the current time. After subtraction, it is determined whether the set time has elapsed and reached 00 seconds. If there is still time left, return to the original routine, and if it is 00 seconds, set the end buzzer, then
Clear the start flag and return to the original routine.

Also, if the speed is set to something other than "6",
After determining whether the start flag is set and whether the speed is “6” or pulse setting, the firing angle corresponding to the set speed “1” or “5” is set in the RAM.
Call more. Here, at 50Hz or 60Hz, the firing angle is different even if the firing time is the same from the point of zero crossing, so it is necessary to determine whether the 50Hz flag is set and to obtain the same power consumption depending on 50Hz or 60Hz, respectively. The 50 Hz firing angle counter and 60 Hz firing angle counter selected are used to count, and a firing angle pulse corresponding to the set speed is applied to the gate of the triac 35. Then, the timer is called and the process moves to the timer processing routine. Here, if the timer has ended and the end buzzer is sounding, it is determined whether the end buzzer is sounding, and further it is determined whether the end buzzer is within 2 seconds, and the timer processing routine is executed. Check the contents of the 4-second repetition counter at . If the time has exceeded 2 seconds, the end buzzer is stopped and the process returns to the initial determination of whether the safety switch 8 is ON in the regular processing routine. 2
If it is within seconds, the process moves to a timer processing routine to increment the repeat counter by 4 seconds.

In the case of pulse setting, the display on the display unit 16 will be "x, x, -, P", but the operation will be repeated at speed "6" for 2 seconds and rest for 2 seconds.
Therefore, if the pulse setting is set, it is determined whether the pulse counter, that is, the 4-second repetition counter, indicates the operating time or the rest time. If it is a running time, an ignition pulse is given as in the case of speed "6", and if it is a rest time, a timer processing routine is called to advance the timer.

Cooking according to the settings is performed by these constant processing routine, key processing routine, ignition processing routine, and timer processing routine.

Next, specific operations and their displays will be explained. First, when you plug in the power plug as a preparation step, it will be automatically cleared and the 12th
As shown in figure a, continuous operation "C" and speed "0"
is displayed. At this stage, the safety switch 8
The drive-ready display by turning ON/OFF may be either lit or off. Next, the time is set by operating the keys 22 and 23. This setting range is 00~99
seconds, and if it is not operated, it will be continuous operation "C". For example, if you want to set 39 seconds after displaying "00" seconds, press the "x10" key 22 three times, then press the "x1" key 22 three times.
If the key 23 is pressed nine times, a display as shown in FIG. 12b will appear. If you want to change the time set in this way, you can do so by continuing to operate the keys 22 and 23 or by clearing the time using the clear key 26 and resetting it. Then, the speed is set by operating the key 24. That is, the speed is set in stages "0" to "6" depending on the number of times the button is pressed. For example, if the key 24 is pressed five times, a speed of "5" will be set and displayed as shown in FIG. 12c. This speed change is also performed in the same way as the time change.

After setting the time and speed as described above, operation is started by operating the start/stop key 27. In this case, it is checked whether the third digit drivable display on the display section 16 is lit. In other words, if the lid 4 is locked in the normal position, the safety switch 8 is turned on.
The display section 16 displays a ready-to-operate display as shown in FIG. 12d. On the other hand, if the lid 4 is removed and is not in the normal lock position, or if the resettable thermal protector is open, the drive ready display will not be displayed and the start/stop key 27 will not operate. In this way, the drive ready display is performed, and the time and speed are also displayed on the same display section 16. For example, if the power outlet is unplugged, the display section 16
If the entire display is off and not displayed, but if the lid 4 is removed or the resettable thermal protector 34 is open, only the ready-to-operate display will be off and not displayed.
It is possible to distinguish between the two even if they do not operate in the same way. After all, it is possible to know all the setting states and the state of the cooking device just by looking at the display contents of the display section 16, and the cooking procedure can be improved and the cooking time can be shortened. After confirming the operable display in this way, when the start/stop key 27 is pressed, the motor 5 is started and cooking begins. At this time,
The time displayed on the display unit 16 is displayed by subtracting one second at a time as time passes. And the remaining time
When the time reaches 00 seconds, the piezoelectric buzzer 77 stops sounding.
By the way, if you want to stop the motor 5 in the middle of operation when such a time setting is made or when continuous operation is set to "C", just press the start/stop key 27 again. With this operation, the start/stop key 27
acts as a stopper, and the motor 5 is stopped, and the remaining time (or "C") and speed at that point are fixedly displayed on the display section 16. If you want to resume operation, press the start/stop key 27 again.
Just press once. After all, even if the continuous operation is set to "C" or the time is set, if you want to stop the operation depending on the cooking status etc. during operation, you can operate the start/stop key 27 that started the operation. , you can stop the cooking process without any confusion, and you can get food in the optimal cooking state.

Further, if intermittent operation is desired, pulse setting may be performed using the key 25 instead of setting the speed using the key 24. That is, when the key 25 is pressed, the display section 16 displays "P" instead of the speed, as shown in FIG. 12e. At this time,
Even if the time is continuous operation "C", it is "00".
~ "99" time setting (this time is the total time of operation and rest) may be used. Therefore, when the start/stop key 27 is pressed, intermittent operation is performed, but the speed is in "6" stages, and the operation is repeated for 2 seconds and then paused for 2 seconds. Incidentally, by setting a predetermined speed using the key 25 and repeating starting and stopping by operating the start/stop key 27, intermittent operation can be performed even at speeds other than speed "6". In this respect as well, the specifications can be expanded by providing a start/stop key 27 which also serves as a start/stop function.

Furthermore, if you want to run only the timer regardless of the motor 5, set the required time (for example, 60 seconds) as shown in Fig. 12f, set the speed to "0", and press the start/stop button. Just press 27. As a result, as time passes, the display is subtracted by 1 second, and when it reaches 00 seconds, the piezoelectric buzzer 71
The sound will sound to notify you that time is up. Such a function can be used as a reference for preparation time, etc.

In the present invention, as described above, a return type thermal protector is used as a member to prevent overheating of the motor when the motor becomes overheated, so that it can automatically return to normal operation when the normal state is reached. In addition, since the connection position is not in series with the motor, but on the motor control line based on the power frequency signal, an extremely small-capacity reset type thermal protector can be used to sufficiently shut off the motor's current supply, and furthermore, By being connected and connected to the safety switch, it is possible to display whether the safety switch is on or not, as well as whether the resettable thermal protector is on or off.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a perspective view, FIG. 2 is a longitudinal front view, FIG. 3 is a plan view of the safety switch, FIG. 4 is a front view of the plaque, and FIG. 5 is a front view of the safety switch.
6 is a vertical sectional side view of the display section, FIG. 6 is a longitudinal sectional side view of the operating section, FIG. 7 is a circuit diagram, FIGS. 8 a to d are voltage waveform diagrams, and FIGS. 9 to 11 are flowcharts.
FIGS. 12a to 12f are front views showing display examples. 3... Container, 4... Lid, 5... Motor, 8...
Safety switch, 15...cutting blade, 16...display section, 34...return type thermal protector.

Claims (1)

[Scope of Claims] 1. A container that includes a cutting blade for cutting food to be cooked and is closed with a removable lid, a motor that rotates the cutting blade, and a control circuit that controls the operation of the motor. , a safety switch is provided that closes when the lid is located in a lock position to enable power to be applied to the motor, and a return type thermal protector is connected to a motor control line of the control circuit based on a power frequency signal. Featured cooking equipment. 2. A container having a built-in cutting blade for cutting food to be cooked and closed by a removable lid, a motor for rotating the cutting blade, and a control circuit for controlling the operation of the motor are provided, and the lid is in a locked position. A safety switch is provided, which is closed when the switch is located at the position of the motor, allowing the motor to be energized, and a return type thermal protector is connected to the motor control line of the control circuit based on the power frequency signal, and the common terminal of the safety switch is connected to the motor control line of the control circuit based on the power frequency signal. A cooking appliance characterized in that one pole of the return type thermal protector is connected to display whether the return type thermal protector is on or off together with the on/off state of the safety switch.