JPH0243482B2 - - 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 configuration and its problems Some conventional toaster ovens have a browning adjustment device that is set in advance so that the browning color is the desired color, just like a toaster. 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 with time constants approximating the heating and heat dissipation characteristics of the appliance, and a CR circuit 1 that A device equipped with a switch _SW1 etc. that opens the main circuit, or a microcomputer etc. can be used to make the second toast the same color as the first toast based on the first toast time and the non-energized time after toasting. Although there are various methods such as a structure in which time is obtained through arithmetic processing, the structure is basically based on a time switch. In addition, in Figure 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, and R ₁ to R ₁₃ is a resistor, 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 cases in which they are used, 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 above-mentioned conventional toaster oven, there is a double display of 1 toast and 2 toasts in the area where you can adjust the browning color of the toast, as shown in Figure 2, 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. In practice, in order to avoid complication in the display, most products are marked with three dots: 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 turn out the same color.

Purpose of the Invention The present invention solves the above-mentioned conventional drawbacks, and provides 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 toast placing net having a width that allows toasting a plurality of toasts at the same time;
A temperature sensing element is placed near the toast placing net, and if the number of toasts is less than the number that can be placed on the toast placing net, no toast is placed on the area where the temperature sensing element is placed. a first timer that operates for a certain period of time from the start of energization; and when the operation of the first timer is completed, the amount of change in temperature detected by the temperature sensing element from the start of energization is set as a reference value. It is equipped with a comparator for comparison and a second timer whose operation time is determined according to the comparison result of the comparator, and is configured to complete toast roasting when the operation of the second timer is completed. .

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

FIG. 3 is a plan view of the main parts of a toaster oven according to an embodiment of the present invention, and 3 is a toast placing net having a width on which two slices of bread 4 can be placed, and only one slice of bread 4 can be placed thereon. Shows the mounted state. The toast placement net 3 is provided with a display 5 for designating the placement position when only one piece of toast is to be placed. Further, a temperature detection element 6 is arranged at a location opposite to the single-sheet printing display 5. 7 is a wall surface forming a cooking cabinet.

Figure 4 is a block diagram of a control circuit that automatically detects whether two toasts are baked or one toast is baked and obtains the optimal toast roasting time depending on the number of toasts, and Figure 5 is a time lapse of the temperature detection element 6. FIG. 5 is an explanatory diagram showing the temperature change characteristics accompanying the process. In FIG. 5, the solid line indicates two-sheet firing, and the two-dot chain line indicates single-panel firing.

The control circuit block includes a temperature detection section 8 consisting of a temperature detection element 6, a first timer 9 that operates for a certain period of time Tc, and a temperature change amount of the temperature detection section 8 after a certain period of time Tc has elapsed from the start of energization. A comparator 10 that compares the amount of change Δθ, a second timer 11 having two types of operating times t ₁ and t ₂ that are selected based on the comparison result, and a device that and an output section 12 that stops energization. Note that a single timer may be used as the first and second timers 9 and 11.
Further, these controls may be performed by a microcomputer, an electronic circuit, or mechanically.

In the above configuration, when two slices of bread are toasted at the same time, the temperature of the temperature sensing element 6 changes very slowly due to the sliced bread 4. Therefore, after the predetermined time tc has elapsed, the amount of change from the temperature of the temperature sensing element 6 at the start of energization becomes smaller than the reference amount of change Δθ, and the second timer 11 selects the time of _t2 and operates. Eventually, after t ₂ hours have passed, the toasting process will be completed. The toast roasting time in this case is tc
+ _t2 . Even if you continue to toast two pieces,
Similar control is performed. However, in this case, the second
The operating time t ₂ ' of the timer 11 is different from the operating time t ₂ when toasting for the first time. This is 2
The residual heat of the equipment is taken into consideration from the second time, and since this correction means is not directly related to the present invention and various means are known in addition to one example shown in the conventional example, a description thereof will be omitted.

Next, when toasting only one piece of bread, there is no sliced bread 4 near the temperature detection element 6, resulting in a blank baking state, and the temperature rises rapidly. After the predetermined time tc has elapsed, the detected temperature far exceeds the reference temperature change amount Δθ, and the second timer 11 selects the time _t1 and operates. Eventually, after t ₁ hour has passed, the toast will finish roasting. In this case, the toasting time is tc+ _t1 .

Effects of the Invention As explained above, according to the present invention, two-panel printing,
In either case of single-slice baking, as long as the slices are placed in the correct place, there is no need for troublesome adjustments according to the number of slices to be toasted, and since these are done automatically, there are no mistakes and you can bake toast with high precision. Color control becomes possible.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram of a conventional toast roasting control device for a toaster oven, Fig. 2 is a perspective view of an operating section of a toaster oven equipped with the same toast roasting control device, and Fig. 3 is an embodiment of the present invention. FIG. 4 is a circuit block diagram of the toast roasting control device, and FIG. 5 is an explanatory diagram of the temperature change characteristics of the temperature sensing element over time. . 3... Toast placement net, 5... Display, 6... Temperature detection element, 9... First timer, 10... Comparator, 11... Second timer, 12... Output section.

Claims (1)

[Claims] 1. A toast placing net having a width capable of toasting multiple toasts at the same time, a temperature sensing element placed near the toast placing net, and when the number of toasts is less than the number that can be placed on the toast placing net. a display section for displaying that toast should not be placed on the portion where the temperature sensing element is arranged; a first timer that operates for a certain period of time from the start of energization;
a comparator that compares the amount of change in temperature detected by the temperature sensing element from the start of energization with a reference value when the timer operation is completed; and a second comparator that determines the operating time according to the comparison result of the comparator. A toast roasting control device for a toaster oven, comprising: a timer, and is configured to complete toast roasting when the second timer completes operation.