JPH0634778B2 - Toaster - Google Patents

Description

TECHNICAL FIELD The present invention relates to a toaster capable of successfully baking frozen bread.

(Prior Art) Due to changes in the dietary form in which each person eats according to their favorite menu and the spread of household freezer storage, bread for toast is also frozen and stored.

However, conventional toasters have not dealt with frozen bread at all.

(Problems to be solved by the invention) For this reason, the inside of the frozen bread must be removed from the freezer until it is toasted by a toaster, or left unattended or thawed by a microwave oven. The surface started to burn even though the temperature had not risen sufficiently, so it was not possible to bake it to the inside, which was troublesome and time-consuming. In addition, he often forgets to thaw it and puts it on a toaster and fails toast.

On the other hand, Japanese Laid-Open Patent Publication No. 54-16274 discloses a temperature sensing device for performing toast control according to the bread condition or the bread loading amount, and a heater control circuit using the temperature sensing device.

According to this, since the temperature sensing unit provided in the refrigerator is located near the bread to be cooked, the temperature of the bread corresponding to the state of the bread, that is, the degree of baking can be detected, and the predetermined baking can be performed. When the condition is reached, the toast operation is terminated.

This is intended to eliminate uneven baking due to differences in bread condition and bread loading amount, that is, differences in the number of breads to be baked at one time.

However, to control the energization of the heater, regardless of the condition of the bread and the difference in the number of sheets to be baked at one time, the heater is simply kept in the energized state until the predetermined baking of the bread is detected, and the predetermined baking is performed. When it detects "," the heater is turned off and the toast operation is ended.

Therefore, the heater is not specially energized during the toast operation.

For this reason, even in the case of frozen bread, the heating conditions of the heater are not taken into consideration, and heating is performed from the beginning with full-power energization of the heater, and the temperature sensed by the temperature sensing unit does not rise much for the overall progress of cooking. Even if it corresponds to some extent that the progress of toast is not progressing, the temperature rise of the surface of the frozen bread is much faster than the temperature rise inside, and the temperature sensing device detects the baking of the bread. By the time the signal to end the toast is given, the surface will be excessively baked and the desired degree of baking will not be obtained, or the inside will not be thawed or heated sufficiently even after the toast has ended. .

Therefore, the present invention is appropriate regardless of differences such as when the temperature inside the refrigerator is low at the time of starting the toast, or when the temperature inside the refrigerator is increased accordingly by performing the toast once or continuously a plurality of times. The purpose of the present invention is to provide a toaster that can be accurately baked into a predetermined state after being thawed.

(Means for Solving Problems) In order to achieve the above-mentioned object, the present invention, as shown in FIG. 1, includes a heater C for heating the inside E of the toaster D, and
Means for detecting the internal temperature as the toast information means A,
When the inside E is below a predetermined temperature range suitable for thawing frozen pans, the heater C is energized until the inside E reaches this predetermined temperature range, and after reaching this predetermined temperature range, the inside E freezes again. When the temperature is higher than the predetermined temperature range suitable for thawing the bread, the heater C is deenergized and the inside E reaches a predetermined temperature range. The heater C is energized for a certain period of time, and the energization control means B is provided for energizing the heater C after a lapse of a predetermined period of time until a predetermined period of time after a pretreatment set in advance to obtain a predetermined baking state has elapsed. It is characterized by that.

(Operation) According to the above configuration of the present invention, the energization control means B first obtains the temperature information from the in-compartment temperature detecting means as the toast information means A from the time of starting the toast, and the in-compartment E defrosts the frozen bread. If the temperature is below a predetermined temperature range suitable for
Since the heater C is energized until the inside E reaches this predetermined temperature range, it can be made to reach this predetermined temperature range rapidly, and after reaching this predetermined temperature range, for a predetermined time. Heater C to keep the inside E in this predetermined temperature range
Is controlled so that the surface of the frozen pan is prevented from excessively rising in temperature, and the inside of the frozen pan is well thawed to be in a state almost the same as normal bread. The energization control means B
Since the heater C is energized for a predetermined time set in advance to bring it into a predetermined baking state after a predetermined time for this thawing, the bread that has been thawed to a state almost the same as the normal bread is in a predetermined state. It can be baked accurately and at high speed.

Even when the inside E is higher than the predetermined temperature range suitable for thawing the frozen bread, the energization control means E stops energizing the heater C until the inside E reaches the predetermined temperature range.
When the inside E is higher than this predetermined temperature range, the surface of the frozen pan is prevented from being excessively thawed as compared with the inside, and after the inside E reaches the predetermined temperature range, the inside of the inter-compartment is set to this predetermined temperature range. Since the heater C is energized for a predetermined time so as to maintain the temperature range, the thawing does not fail even when the inside E is above the predetermined temperature range, and the baking process similar to the above case can be performed. it can.

(Embodiment) A first embodiment of the present invention shown in FIGS. 2 to 6 will be described. In this example, as the toast, the normal bread is toasted, and the normal toast is selectively frozen toasted frozen bread, and as other cooking, baking of gratin, pizza, cookies, and heating of cooked foods are performed. It shows a case of an oven toaster capable of performing the above.

As shown in FIGS. 2 to 4, the body 1 is provided with an operation / control section 3 on one side of a cooking cabinet 2. A door 4 having a transparent window 4a is provided at a front portion of the cooking cabinet 2, and a lower edge of the door 4 is connected to a body 1 by a hinge 5 so as to be opened and closed. Inside the cooking chamber 2, heaters 6 and 7 are provided in an upside down state. A net-like cooking table 8 for receiving food is provided between the heaters 6 and 7, and a mechanism (not shown) interlocks with the opening and closing of the door 4 to move in and out of the cooking cabinet 2.

At the bottom of the operation / control unit 3, a power supply circuit 12 equipped with a power supply circuit 35 for driving the heaters 6, 7 and the like and peripheral electric devices is attached under a ceiling of a downward case 13 via a synthetic resin base 14. is there. An operation panel 15 is provided on the front surface of the operation / control unit 3. From the bottom of the operation panel 15, a power switch button 16, a baking color adjustment knob 17, a cooking start / end button 18, a timer setting button 19 for setting the cooking time, and a menu setting button 20 for setting the type of cooking are provided. Above that, a cooking time (timer) display section 21 and a normal toast display section 22 according to the type of cooking to be set,
Frozen toast display 23, gratin display 24, pizza display
25, a cookie display section 26, and a warmed article display section 27 are provided respectively.

A microcomputer board 52 equipped with a microcomputer (hereinafter referred to as a microcomputer) 51 for controlling the heaters 6 and 7 and its peripheral electrical equipment is arranged on the back of the operation panel 15, and the microcomputer board 52 is combined with a back plate 53 on the back of the operation panel 15. It is attached via a resin base 54.

As shown in the control circuit of FIG. 6, the operation section and display section on the operation panel 15 are used as an operation circuit block 31, a 7-segment 4-digit cooking time display circuit block 32, a menu display circuit block 33, and a baking color. The burn color adjusting volumes 34 interlocking with the adjusting knobs 17 are individually connected to the microcomputer 51. Further, the microcomputer 51 includes a power supply circuit 35, a clock oscillation circuit 36, a control circuit 37 for the heaters 6 and 7, a cooking cabinet 2
A temperature sensor 38 for detecting the internal temperature and a buzzer 46 are also connected.

As shown in FIGS. 2 and 4, the temperature sensor 38 is held by the lower end tubular portion 41a of a sensor holder 41 made of aluminum, and the sensor holder 41 is folded into two pieces 42a, 42c of an elastic clip 42. It is elastically sandwiched between the side plates 43 of the cooking cabinet 2 in close contact with the back surface thereof. A slit 44 is opened in the side plate 43 of the cooking cabinet 2 for this sandwiching, and a piece of the clip 42 is formed.
42c can be inserted into the cooking cabinet 2 from the back side of the side plate 43. This inserted state is the bulge 42b of the folded part.
Is abutted on the rear surface of the upper wall 43a above the slit 44 of the side plate 43 to bring the piece 42c into close contact with the surface of the lower wall 43b, thereby further stabilizing the side wall. As a result, the heat in the cooking cabinet 2 passes through the side plate 43 and the sensor holder 41, and the temperature sensor 38
It is easy to be transmitted to.

A series of controls will be described below. Menu setting button
When 20 is operated, the type of cooking changes to automatic toast, frozen toast, and so on. This change in the type of cooking is externally displayed by changing the lighting position of each display unit corresponding thereto. Therefore, the predetermined cooking setting is performed by operating the menu setting button 20 so that the corresponding display section lights up.

If the normal toast is set now, the microcomputer 51 sets the cooking time of the normal toast from the temperature information in the cooking cabinet 2 at that time and the internal temperature-necessary cooking time characteristic, and the cooking start / end button 18 is pressed. After the cooking start operation (the start and the end are alternately changed with each pressing), the heaters 6 and 7 are kept in the ON state for the set time, and the normal toast for the set time is performed. When the button 18 is terminated, the automatic cooking can be artificially terminated.

The internal temperature-required cooking time characteristic is known in advance as shown in the graph of FIG. So this is the RO of the microcomputer 51
It can be stored in M and know the cooking time required at that time depending on how many times the temperature inside the storage cabinet is, and it is necessary to successfully achieve the set normal toast from the temperature conditions inside the storage cabinet. The cooking time can be set easily and appropriately. The cooking time is set in this way,
In the case of baking only once, or in the case of baking many times in succession, it is possible to always obtain the same normal toast regardless of the temperature conditions inside the oven, regardless of the temperature conditions.

The operating position of the burn color adjustment knob 17 is the burn color adjustment
The set value of 34 has been decided. In the state of the figure, moving the knob 17 to the light display side on the left side of FIG. 3 makes the baked state lighter, and moving it to the dark display side on the right side makes the baked state darker.

In this case, the amount of heat consumption differs depending on whether only one toast or two are toasted, which affects the lightness and shade of the baked state.
Therefore, the baking color adjustment knob 17 is provided with a shade adjustment scale 55 for one-sheet baking and a shade adjustment scale 56 for two-sheet baking (Fig. 3). In some cases, the setting position is changed to obtain the same burnt color.

Next, when the frozen toast is set, the microcomputer 51 controls the low temperature heating that maintains a predetermined temperature range suitable for thawing the frozen bread before starting the normal baking heating during the automatic control flow in the case of the normal toast. Control to keep the condition for a certain period of time.

This can be shown by a simple flowchart as shown in FIG.

By performing such a treatment, it is possible to eliminate the inconvenience that when the frozen pan is baked at a normal temperature from the beginning, the surface that is thawed quickly becomes charred and heat does not easily reach the inside.

As such a thawing process, when the frozen toast is carried out at the beginning of use of the oven toaster, the thawing process time is set during the rise of the internal temperature to a predetermined cooking temperature from the start of cooking. As one of the forms, as shown in the graph of FIG. 9, the heater 6 during the thawing time after the start of cooking,
By turning on and off 7 for a certain short time, a wavy temperature rising state is obtained, and the internal temperature does not exceed the thawing upper limit temperature T ₀ .
Thawing is completed while the temperature is within a predetermined temperature range suitable for thawing, and after the thawing processing time elapses, a predetermined time set in advance to obtain the predetermined baking state of the heaters 6 and 7 from the inside temperature and the like elapses. , Keep it on all the time with full power so that it can be baked accurately and at high speed in the same manner as in the case of normal toast.

In short, in the present embodiment, the microcomputer 51, which is the energization control means, first of all, the temperature inside the cooking cabinet 2 is below the predetermined temperature range suitable for thawing the frozen bread from the start of the toast based on the temperature information from the temperature sensor 38. In this case, since the microcomputer 51 energizes the heaters 6 and 7 until the inside of the cooking cabinet 2 reaches this predetermined temperature range, it is possible to rapidly reach this predetermined temperature range. Since the heaters 6 and 7 are energized so as to keep the inside of the cooking cabinet 2 in the predetermined temperature range for a predetermined time, the surface of the frozen pan is prevented from being excessively heated and thawed well inside. It can be made into almost the same condition as normal bread. Further, since the microcomputer 51 energizes the heaters 6 and 7 for a predetermined time set in advance to bring it into a predetermined baking state after a predetermined time for this thawing, it is thawed to a state almost the same as the normal bread. The bread can be baked into a predetermined state accurately and at high speed.

Further, as a form different from the energization control of the above embodiment, as shown in FIG. 10, the temperature range T _{1 to} T ₂ suitable for thawing is defrosted at a temperature rising time suitable for thawing during baking of bread. It is also possible to control the heaters 6 and 7 to be turned on and off so as to keep them for the time.

As another form, as shown in the graph of FIG. 11, the heaters 6 and 7 are turned on and off for a short period of time at a temperature suitable for thawing during baking of the bread, thereby providing a wavy temperature rising state. It is also possible to obtain a temperature range T _{1 to} T ₂ suitable for thawing.

Furthermore, as shown in FIG.
When the temperature reaches ₀ , the heaters 6 and 7 may be turned off only once to achieve thawing during the temperature decrease, and then baking may be performed.

Next, when the frozen toast is the second time or later, or when it is performed immediately after the normal toast, and when the internal temperature is equal to or higher than the upper limit temperature T _{0 in} the predetermined temperature range suitable for thawing in FIG. Keeps the heaters 6 and 7 off and lowers the temperature inside the cooking cabinet 2 to a predetermined temperature range or lower, for example, the upper limit temperature T ₀ or lower, and then sets a predetermined temperature range T _{1 to} T ₂ suitable for thawing. The necessary time is controlled so as to keep it, and after thawing, it is baked in the same manner as for normal toast.

Thereby, even when the inside of the cooking cabinet 2 is higher than the predetermined temperature range suitable for thawing frozen bread, the microcomputer 51 causes the cooking cabinet 2 to operate.
The energization of the heaters 6 and 7 is stopped until the inside reaches the predetermined temperature range, so that the inside of the cooking cabinet 2 is higher than the predetermined temperature range and the surface of the frozen pan is thawed excessively as compared with the inside. After the inside of the cooking cabinet 2 reaches the predetermined temperature range, the heaters 6 and 7 are energized for a predetermined time so as to keep the inside of the cooking cabinet 2 at the predetermined temperature range. Even when the temperature exceeds the temperature range, the thawing does not fail, and the baking process similar to the above case can be performed.

The necessary time in this case naturally includes the time required for the temperature inside the refrigerator to fall to a temperature range suitable for thawing, and the thawing temperature may be maintained by any of the above control methods.

Next, when the menu setting button 20 is operated to set any of cooking such as gratin, pizza, cookies, and warm foods other than the toast, the microcomputer 51 determines the predetermined inside temperature corresponding to the set cooking. Since the heaters 6 and 7 are controlled to start cooking from the time of starting the cooking so that the cooking is performed, the cooking at the temperature suitable for the cooking is automatically performed only by setting the cooking.

This can be shown in a graph as shown in FIG. In FIG. 12, a line P indicates a heating curve in the case of gratin, Q in the case of pizza, R in the case of cookie, and S in the case of warm food.

Here, the cooking time in the case of these cooking is performed by operating the timer setting button 19 and setting the timer value.
The set value of this timer value is set to up or down depending on the time and number of times while the button 19 is pressed, the state is displayed on the cooking time display section 21, and the final display value is the set value of the timer. For that time, the microcomputer 51 controls the heaters 6 and 7 so as to perform each cooking under the predetermined temperature condition in the refrigerator. Therefore, the degree of cooking can be arbitrarily determined, such as the presence or absence and the degree of browning.

The progress of the cooking time is displayed as a change in the remaining time by counting down the display value.

The second embodiment of the present invention shown in FIGS. 15 and 16 is a heater.
66 and 67 have strengths such as 90W and 50W,
In the case of the control circuit 64, the normal toast and the frozen toast are switched by the changeover switch 61, and in the case of the frozen toast, the defrosting process is automatically performed by the two thermoswitches 62 and 63 which are switched according to the change of the cooking temperature. It is shown (Fig. 15).

The heaters 66 and 67 are connected in parallel, and the thermoswitches 62 and 63 are connected in series on the strong heater 66 side to connect the switches 62 and 67.
Both 63 are on the a contact side at 200 ° C or less, and the switch 62 is 22
When the temperature is 0 ° C or higher, the switch 63 is switched to the b contact side at 240 ° C or higher. The changeover switch 61 is provided in parallel with the thermoswitches 62 and 63 so that the switches 62 and 63 can be short-circuited or released.

Reference numeral 65 indicates a timer for setting the toast time.

The temperature control in this embodiment will be described. In the case of normal toast, the changeover switch 61 is turned on. Then, regardless of the switches 62 and 63, the heaters 66 and 67 are kept in the ON state for the time set by the timer 65, and the normal toast according to the set time is performed.

In the case of frozen toast, the changeover switch 61 is turned off. As a result, the heater 66, which is initially strong, is switched to the switches 62, 63, a.
It is energized through the contacts and is turned on together with the heater 67.
Therefore, the temperature inside the chamber rapidly rises due to the heat of both the heaters 66 and 67. When the internal temperature reaches 220 ° C, the switch 62 is switched to the b contact side. As a result, the power supply to the heater 66 is cut off, and thereafter, only the weak heater 67 heats the interior temperature of the chamber gradually. When the internal temperature reaches 240 ° C, the switch 63 also switches to the switch b contact side. At this time, the heater 66 is turned on again through the switches 62, 63 and b contact, and thereafter the heater 66 is turned on.
Due to the heat of both 66 and 67, the temperature inside the chamber suddenly rises again,
At that point, defrosting is completed, and after that, it is baked until the timer 64 reaches the set time.

A third embodiment of the present invention shown in FIGS. 17 and 18 is provided with a strong heater 71 for preheating and baking and a weak heater 72 for defrosting and baking, and in the case of a normal toast, both heaters are used from beginning to end.
71 and 72 are turned on, and in the case of frozen toast, the heater 71 is used for preheating and baking, and the motor 72 is used for defrosting and baking.
Is used.

In the case of frozen toast, the heater is preheated at the beginning of the toast.
71, the heater is used instead of the heater 71 in the subsequent freezing processing state.
The thermo switch 73 is used for switching using only 72. The thermoswitch 73 should be energized only at the heater 71 on the a-contact side at 200 ° C or lower, and switched to the b-contact side at 200 ° C or higher so that the heater 72 can be energized instead of turning off the heater 71. Then, the preheating and the thawing can be performed.

On the other hand, a make-type thermoswitch 74 is provided in parallel on the a-contact side of the thermoswitch 73, and it is turned on at 220 ° C. or higher to short-circuit the a-contact side of the thermoswitch 73 so that the heater 71 can be energized. Heater 71 is make thermo switch 74
The heater 72 is turned on through the thermo switch 72, and the heat of both the heaters 71 and 72 is used to bake the toast time set in the timer 65.

In this case, the operation chart of each switch and heating control are shown in 18th.
As shown in the figure.

In the case of a normal toast, in order to always turn on the heater 72, a changeover switch 75 for manually short-circuiting the a-contact side of the make thermo switch 74 or releasing it is provided. The heater 72 is turned on by switching the thermoswitch 73 to the b contact side when the temperature inside the chamber reaches 200 ° C., and thereafter the two heaters 71 and 72 perform baking.

In the fourth embodiment of the present invention shown in FIGS. 19 to 21, in the case of a normal toast, the upper and lower heaters 6 and 7 perform the toast while the toast time set by the timer 65 is kept on all the time, and the frozen toast is provided. In this case, the operation of the cycle timer 81 is performed so that the heaters 6 and 7 are turned off for a certain period of time until the internal temperature of the refrigerator reaches the predetermined toast temperature to perform the thawing process.

Operation part 65a of timer 65 and operation part 81a of cycle timer 81
And are provided on the operation panel 15 of the body 1.

The cycle timer 81 is a switch 83 in series with both heaters 6 and 7.
And a switch 82 in series with a cycle timer 81.
However, the switch 83 is normally closed and is in the on state other than being turned off by the cycle timer 81.

In the case of frozen toast, when the toast time is set with the timer 65 and the cycle timer 81 is set, the switches 82 and 83 are turned on in synchronization with it and the motor 81b of the cycle timer 81 is set.
Turns on. In this state, the heaters 6 and 7 are energized through the timer 65 and the switch 83 to preheat. At the end of preheating, the switch 83 is turned off by the motor 81b, so that the heaters 6 and 7 are de-energized and the temperature inside the refrigerator does not rise so that the thawing process is performed.

When it is further cut off for a predetermined time, the switch 82 is turned off by the motor 81b to release the self-holding of the motor 81b to turn it off, and the switch 83 is returned to the on state. By this, both heaters 6, 7
Is turned on and baking is performed.

(Effect of the Invention) According to the present invention, when the inside E is below a predetermined temperature range suitable for thawing frozen bread, the heater C is energized until the inside E reaches this predetermined temperature range, so that the temperature is rapidly increased. It is possible to reach this predetermined temperature range, and after reaching this predetermined temperature range, the heater C is energized and controlled so as to keep the inside E in this predetermined temperature range for a predetermined time. While preventing the surface of the bread from being excessively heated, it is well thawed to the inside so that it can be almost in the same condition as a normal bread.
Further, after the predetermined time for this thawing has passed, the heater C is energized for a predetermined time set in advance to bring it into a predetermined baking state, so that the thawed bread is brought into a predetermined state in substantially the same state as the energized bread. It can be baked accurately and at high speed.

Even when the inside E is higher than the predetermined temperature range suitable for thawing the frozen bread, the heater C is de-energized until the inside E reaches the predetermined temperature range, and the inside E reaches the predetermined temperature. Since it is higher than the temperature range, the surface of the frozen pan is prevented from being thawed excessively as compared with the inside, and after the inside E reaches a predetermined temperature range, the inside of the storage space is kept at this predetermined temperature range. Since the heater C is energized for a period of time, thawing does not fail even when the inside of the refrigerator E is above the predetermined temperature range, and the baking process similar to the above case can be performed.

[Brief description of drawings]

1 is a block diagram showing the configuration of the present invention, FIG. 2 is a vertical sectional side view of an oven toaster showing an embodiment of the present invention,
FIG. 3 is a front view of a half portion of FIG. 2, FIG. 4 is a vertical cross-sectional view taken at a position different from FIG. 2, and FIG. 5 is an exploded perspective view of a temperature sensor mounting portion, FIG. Is the control circuit diagram, 7th
Fig. 8 is a graph showing the temperature inside the oven toaster-required cooking time characteristic, Fig. 8 is a flow chart showing the outline of normal, frozen toast cooking that enables defrosting in the case of frozen toast, and Figs. 9 to 13. Are graphs showing the temperature control state in the case of frozen toasts that have been individually thawed, FIG. 14 is a graph showing the temperature control state in the case of performing various cookings other than each frozen toast, FIG. 15, FIG. 16
FIGS. 17, 17 and 18 are control circuit diagrams showing the second and third embodiments of the present invention and a diagram showing the control state, and FIG. 19 shows the fourth embodiment of the present invention. FIG. 20 is a front view of a part of the oven toaster, and FIG. 21 is a diagram showing a control state. A ... Toast information means B ... Control means C ... Heater D ... Toaster E ... Inside

Claims (1)

[Claims] 1. A heater for heating the inside of the refrigerator, a means for detecting the temperature inside the refrigerator, and when the inside of the refrigerator is below a predetermined temperature range suitable for thawing frozen bread,
Energize the heater until the inside of the refrigerator reaches this specified temperature range, and after the inside of the refrigerator reaches this specified temperature range, and if the inside of the refrigerator is higher than the specified temperature range suitable for thawing the frozen bread, turn on the heater. After stopping the power supply to the inside of the refrigerator and reaching the predetermined temperature range, the heater is energized to maintain the predetermined temperature range in the inside for each predetermined time, and after the predetermined time has passed, the predetermined baking state In order to achieve the above, the toaster is provided with: energization control means for energizing the heater until a predetermined time elapses after the pretreatment.