JPH0244212B2 - OOBUNTOOSUTANOTOOSUTOBAISHOSEIGYOSOCHI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a toast roasting control device for a toaster oven that can toast two toasts at the same time in a general household.

Conventional structure and its problems In conventional toaster ovens, like a toaster, you can adjust the browning color adjustment device in advance so that the browning color is the desired color, and then all you have to do is turn on the switch. There was one that had a toast roasting control device that baked the toast to the same color. Its configuration, as shown in Figure 1, includes heaters H ₁ and H ₂ , a CR circuit 1 consisting of a capacitor charging circuit and a discharging circuit that have time constants approximating the heating and heat dissipation characteristics of the appliance, and a CR circuit 1 that Switch that opens the main circuit, SW ₁
etc., or a configuration that uses a microcomputer etc. to calculate the second toast time to achieve the first toast color based on the first toast time and the non-energized time after toasting, etc. ,
There are various methods, but basically the configuration is based on a time switch. In Fig. 1, 2 is a power supply, TM ₁ is a time switch, M ₁ is a magnet, Q ₁ and Q ₂ are switch elements, ZD ₁ and ZD ₂ are Zener diodes, D ₁ to _{D 3} are diodes,
VR ₁ is a variable resistor, R ₁ to R ₁₃ are resistors, and C ₁ to _{C 4} are capacitors.

However, although most toaster ovens are configured to toast two pieces at the same time, there are various usage situations, such as when toasting two pieces at the same time, when toasting only one piece, and when toasting only one piece, or a combination thereof. In this case, the toasting time is different between two pieces and one piece. In the conventional toaster oven described above, as shown in Figure 2, there is a double display of 1 toast and 2 toasts in the area where the toast color is adjusted, but as mentioned above, the number of toasts varies. When used in combination in this case, it is necessary to change the browning adjustment each time. At this time, in order to obtain the same color regardless of the number of sheets, the user must perform highly precise adjustment work. Practically speaking, in order to avoid complication in the display, most products are marked with three points: light, medium, and dark, as shown in Figure 2, so if you set them in the middle, the number of sheets to be baked will increase. When it was different, it was extremely difficult to adjust it again so that it would get the same brown color.

Purpose of the Invention The present invention solves the above-mentioned drawbacks of the conventional technology.It is an object of the present invention to provide toast roasting control using an oven toaster that can always produce toast with the same brown color regardless of the number of toasts and without the need for difficult adjustments. The purpose is to provide equipment.

Structure of the Invention In order to achieve the above object, the toast roasting control device for a toaster oven of the present invention includes a charging circuit and a discharging circuit having time constants that approximate the heating and heat dissipation characteristics of a cooking chamber, and a charging completion time of the charging circuit. a variable resistor for arbitrarily adjusting the temperature, a resistor connected in series to the variable resistor, a toast number selection switch connected in parallel to the resistor, and a power switch for opening the power switch when the charging operation of the charging circuit is completed. The configuration includes a power switch drive circuit.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 is a circuit diagram of a toast roasting control device for a toaster oven in one embodiment of the present invention.
Components that are the same as those shown in the figures are given the same reference numerals. In FIG. 3, H ₁ and H ₂ are heaters that heat the cooking chamber (not shown), SW ₂ is a switch that opens the main circuit by the excitation operation of magnet M ₂ , and the heaters H ₁ and H ₂ are Control circuit is connected. This control circuit consists of a power supply section of the circuit consisting of a resistor _R2 , a diode _D2 , and a capacitor _C3 , and a charging section consisting of a resistor _R4 and a capacitor _C2 having a time constant correlated to the temperature rise characteristics of the cooking cabinet. A circuit section, resistors R ₅ and R ₁₂ that adjust the set potential, a variable resistor VR ₁ , and a switch element Q ₂ that performs the switching operation in order to switch to the discharge circuit described later when the potential of the capacitor C ₂ reaches the set value. , a discharge circuit consisting of a capacitor C ₂ having a time constant correlated to the heat dissipation characteristics of the cooking cabinet, a resistor R ₁₁ and a Zener diode ZD ₁ , and a switch element Q ₁ and a magnet that operate triggered by the discharge of the capacitor C ₂ . _M2 , a charging time difference corresponding to the heating time difference between single-sheet firing and double-sheet firing, that is, a set potential, which are connected in series to M2, resistors _R5 , _R12 , and variable resistor _VR1 that adjust the charging switching setting potential. It consists of a resistor _R14 that obtains the difference between the two sheets and a switch _SW4 connected in parallel to this resistor _R14 .

Fig. 4 is a diagram of the operating characteristics of the above circuit, and Fig. 5 is a perspective view of the operating section of a toaster oven equipped with the above circuit, in which 3a and 3b are power knobs, 4 is a toast number selection knob, and 5 is a browning color adjustment knob. It's a knob. The switch SW ₂ is opened and closed by the power supply knobs 3a and 3b, the switch SW ₃ is opened and closed by the toast number selection knob 4, and the variable resistance VR ₁ is varied by the browning adjustment knob 5.

Next, the operation will be explained. First, if you want to toast two pieces at the same time, set the toast number selection knob 4 to 2.
When the desired color is set, the switch SW ₃ opens. When the baking color adjustment knob 5 is set to the desired color, the position of the movable terminal of the variable resistor VR ₁ is determined accordingly. When the power knob 3a is pressed, the switch SW 3 is opened. ₂ is closed,
This determines the set potential E _VR for switching from charging to discharging. At the same time, the terminal voltage E _C of capacitor C ₂ begins to increase gradually. When the set potential E _VR is eventually reached, the switch element _Q2 operates and forms a discharge circuit.
Then, the charge stored in capacitor C ₂ is discharged all _at once through Zener diode ZD ₁ until _terminal voltage E _c reaches Zener voltage _E Finish baking. After the roasting is completed, the terminal voltage E _C of the capacitor C ₂ gradually decreases through the discharge resistor R ₁₁ . Note that the resistance value of the resistor _R9 is sufficiently smaller than the resistance value of the resistor _R11 , so it can be ignored. any time
If it toasts again after t ₁ , closing switch SW ₂ will reduce the terminal voltage of capacitor C ₂ E _C
The battery switches to charging in the middle of discharging and repeats the above operation again. At this time, the time ΔT ₁ for the terminal voltage E _C of the capacitor C ₂ to reach the Zener voltage E _ZD when toasting for the first time, and the time ΔT 2 for the terminal voltage E C of the capacitor C ₂ to reach the Zener voltage E _ZD when toasting for the second time. The difference is corrected as the difference in roasting time T between toasting when the cooking chamber is at room temperature and toasting when the cooking chamber has residual heat, resulting in almost the same brown toast. It will be done. After that, the same correction is performed no matter how many times it is repeated, and almost the same baked color is obtained.

Next, when toasting one slice at a time, set the toast browning selection knob 4 to toast one slice, close the switch SW ₃ , press the power knob 3a and close the switch SW ₂ , and the set potential E _VR of the switch element Q ₂ will be The value ΔEve corresponding to the time difference S between single-sheet printing and double-sheet printing is lowered, and the operation described in the above-mentioned double-sheet printing is performed.

Effects of the Invention As explained above, according to the present invention, two-panel printing,
In either case of single-slice baking, the user is not forced to make any complicated adjustments; just by adjusting the browning color once, you can always get toast with the same browned color without any mistakes such as overcooking or undercooking. . Also, there is no wastage of energy due to overcooking, etc.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of a toast roasting control device of a conventional toaster oven, Fig. 2 is a perspective view of an operating section of a conventional toaster oven, and Fig. 3 is a toast roasting control device of a toaster oven according to an embodiment of the present invention. FIG. 4 is a circuit diagram of the control device, FIG. 4 is an operational characteristic diagram of the circuit shown in FIG. 3, and FIG. 5 is a perspective view of the operating section of the toaster oven in one embodiment of the present invention. SW ₂ , SW ₃ ...Switch, _M2 ...Magnet,
Q ₁ , Q ₂ ... Switch element, ZD ₁ ... Zener diode, VR ₁ ... Variable resistor, R ₄ , R ₁₁ , R ₁₄ ...
…resistance.

Claims (1)

[Claims] 1. A charging circuit and a discharging circuit having time constants approximating the heating and heat dissipation characteristics of a cooking cabinet, a variable resistor for arbitrarily adjusting the charging completion time of the charging circuit, and a resistor connected in series with the variable resistor. A toast roasting control device for a toaster oven, comprising: a toast number selection switch connected in parallel to the resistor; and a power switch drive circuit that opens the power switch when the charging circuit completes charging operation.