JPS60165428A - Oven toaster - Google Patents

Abstract

PURPOSE:To form the titled oven toaster capable of making reproduction of an appropriate roasted state upon repeating roasting by providing load control means which stops the power supply to the load when receiving an output signal from counted value discriminating means which discriminates whethr a pulse has reached a predetermined value. CONSTITUTION:When a contact 32 is closed, power is started to be supplied to a heater 33. The rise in the temperature of the heater 33 is sensed by a thermosensitive element 39, and outputted as a divided voltage at a connected point of a series connection circuit with a resistor R1. When the frequency of a voltage- frequency converter which has received the output voltage increases, and the output signal from the voltage frequency converter 38 is inputted to a counter 37 periodically reset by a multivibrator 36 and a predetermined number of pulses is counted, the counter 37 emits an output signal, and triggers the gate of a silicon control rectifying device 35, an exciting current being flowed to a coil 34 series-connected to the silicon control rectifying device 35 and the contact 32 being opened by an electromagnetic force. As a result, the power supply to the heater 33 is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an oven toaster that corrects the energization time so that the same color is obtained each time during repeated roasting.

Conventional h'4 configuration and its problems Conventionally, automatic toasters have been operated using charging and discharging of cR to turn on electricity only for a period of time to compensate for the rise in temperature of the toaster. This will be explained below using FIG. (1)
is the power supply, and when the contact (2) is turned on, the heater (4) is turned on.
) is applied to start energizing. At the same time resistance (
6) and Taiode (7) and then the plain soup ■Contemp”
(8) can be recharged up to a certain voltage. The constant voltage is divided by the resistance range αυ to obtain the reference voltage ■r. On the other hand, the capacitor (2) begins to be charged through the variable resistor Q:l and the diode (141), and the capacitor voltage ■ increases.If ■o becomes almost the same as ■,
PUT (9) performs a switching operation and turns on, the charge in capacitor (b) is discharged through resistor (to), and the thyristor (5) is made conductive by the discharge current.

When the thyristor (5) becomes conductive, the coil (3) is energized and the contact (2), which was mechanically latched to the closed contact, is energized and the heater (4) is de-energized. In this way, the time for VC to rise to vr becomes the time for energizing the heater (4). If the contact (2) is turned on and off after the heater (4) has been powered off for a certain period of time (while the capacitor has zero charge), the capacitor (2) will be recharged. , (2) The time required for c to rise to V is shortened, the roasting time is shortened, and the roasting condition is corrected. Now, if we consider the case of short-time communication,
Since the temperature rise characteristic of the pilgrim body is delayed to the voltage rise characteristic of the capacitor Rica, the humidity of the H & body hardly rises due to its own heat, but the pressure VC on the capacitor 'f
will rise to some extent, and if the second roasting is subsequently performed, the correction will be too much and the roasting will become unwell.

OBJECTS OF THE INVENTION The present invention is directed to IC! The purpose of the present invention is to provide an open toaster capable of reproducing the proper degree of roasting during repeated roasting, which eliminates the drawbacks of the conventional ones.

Structure of the Invention In order to achieve the above object, the uninvented automatic roasting device includes a temperature sensing means for measuring the surface of the food to be cooked or its surroundings, and an oscillation device whose wave number changes depending on the output of the temperature sensing means. a counting means for counting the number of pulses of the oscillating means; a counting means for determining whether the count value, which is the output of the counting means, has reached a predetermined value; DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described with reference to the drawings.

FIG. 2 is a circuit block diagram of the main parts of an open toaster according to an embodiment of the invention, where (2) is a temperature sensing means for determining the temperature of the food to be cooked or its surroundings, and (2) is 11 fJ.
An oscillating means whose frequency changes according to the output of the humidity sensing means Qυ, a counting means for counting the number of output pulses of the 01j oscillating means (2), and (to) a count value which is the output of the counting means. is the count (h(i
The Y4J constant means (2) is a load control means that stops energizing the load (2) depending on the output of the count value determination means (3).

Figure 3 is a circuit diagram of the open toaster in this example, and what is 0g? When the contact point) is closed, electricity starts flowing to the heater. The rise in temperature of the heater (to) is sensed by the TSM element and output as a divided voltage at the connection point of the series connection circuit with the resistor (R□).

The frequency of the voltage/frequency converter that receives this increases,
The voltage/frequency converter (2) is connected to the counter G (7) which is reset according to the standard by the multi-pipe leak (7).
When the output of FC is manually inputted and a predetermined number of pulses are generated, the counter (B) outputs an output and triggers the gate of the silicon-controlled rectifier (FC), which is connected in series to the silicon-controlled rectifier (FC). An exciting current flows through the coil (2), and the contact C is opened by electromagnetic force. Now the heater (2
) is stopped.

Next, the operation of the open toaster in this example is explained in the fourth example.
This will be explained using figures. The temperature sensing element (when the temperature in the field is low, the output frequency of the voltage/frequency converter (7) is low as shown in Figure 4 tal. This low frequency pulse is input to the counter), but on the other hand, The counter G(7) is reset at a constant cycle of the multipipe rake (J')i. Counter 757 here
), but if it is set to output a high level if 10 pulses arrive after a reset, then the 4th
If the pressure/frequency converter output is counted in γ using the left (first) output of the multivibrator output shown in Figure (b) as the start timing, Figure 4 (dashed line of counter output shown in cl; 6 [ It should output an output like 1 (2 pieces 1"). However, the output on the right side of the multivibrator output is (2 pieces 1").
Since there is an output), the counter G is reset, and the output of the counter is actually output, and the power supply to the heater continues.

On the other hand, as the temperature of the temperature sensing element increases, the output frequency of the voltage/frequency converter (2) increases as shown in Figure 4(d), resulting in a multi-pipe rake as shown in Figure 4(e). If the output pulses of the voltage/frequency converter (to) reach 10 or more during the reset pulse, the counter (b) outputs a high level output as shown in Figure 4 (fJ) and the ), and the power supply to the heater is stopped as described above.

Now, if we think about repeated roasting, the temperature of the open toaster has risen by 2' since the first energization rC, and the time it takes for the output pulse number of the voltage/frequency converter to reach the predetermined value is shorter. As a result, the cooking time can be appropriately corrected, and the food can be cooked in the same way every time.

Effects of the Invention As explained above, according to the present invention, since conventionally corrections were made during repeated roasting based on time information, for example, if the toaster door was opened or closed after toasting bread once, Although there was a temperature difference in the toaster compartment for the second time depending on the conditions such as whether the toaster was left in the oven or not, the electricity supply time was the same, so the toasting process was different. By introducing second and subsequent corrections based on the temperature that has the greatest effect on the roasting quality, it is possible to more accurately reproduce the roasting quality when repeatedly roasting.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram of a conventional automatic toaster, Fig. 2 is a circuit block diagram of main parts of a toaster oven according to an embodiment of the present invention, and Fig. 3 is a circuit diagram of a sub-Puntoaster.
FIG. 4 is a signal waveform diagram of each part of the circuit shown in FIG. 3. υ...Temperature sensing means, (2)...Oscillating means, (2)...
... #1 number means, (c) ... count value judgment hand dust, etc.)
...Load control means, (E)...Negative lr Agent Yoshihiro Morimoto Figure 1 Figure 2 Figure 3 Figure 1

Claims (1)

[Claims] 1. A temperature sensing means for measuring the temperature of the food to be cooked or its surroundings, an oscillating means whose frequency changes depending on the output of the humidity sensing means, and a counting means for counting the number of pulses of the oscillating means;
A count value judgment means for judging whether the count value which is the output of this counting means has reached a predetermined value or not; a load control means for stopping the JU+ electricity to the load in response to the output of the count value judgment means; Equipped with an open door