JPS6334879A - Automatic roaster - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an automatic roasting device for roasting toast, pizza, etc.

[Prior Art] Conventionally, an automatic roasting device that uses a CR timer to control energization of a heater starts charging a capacitor via a resistor and starts energizing the heater when a switch is turned on. It is known that when the charging voltage of the capacitor reaches a predetermined level, a switching element is operated to instantly discharge the charge of the capacitor and stop energizing the heater. However, with a device like this that always discharges all the charge in the capacitor instantly, even when roasting is repeated, the timer is always constant, so as the second and third roasting is repeated, the storage time increases. If the internal temperature becomes high, the problem of overcooking will occur.

For this purpose, a Zener diode is connected in series with the switching element, and when the switching element is turned on, the charge in the capacitor is instantly discharged to the Zener voltage, and then it is slowly discharged through the resistor, and the capacitor is charged depending on the interval of repeated roasting. It is known that the time is adjusted so that there is a surplus of time. (Refer to Japanese Unexamined Patent Publication No. 5'5-151920) [Problem to be solved by the invention] By the way, in an automatic roasting device, for example, the setting time varies greatly depending on whether you are baking toast or pizza. If a variable resistor is used to adjust the time, the variable resistor must be operated each time the object to be roasted is released, which makes the operation cumbersome. For this reason, it is possible to change the timer hour by changing the resistance value of the charging circuit in stages by changing the switch.
If this idea is applied to the conventional example mentioned above, the charging speed of the capacitor can be changed by changing the switch, but the discharging of the capacitor is always performed using a common Zener diode. is always constant regardless of the type of roasted material, and is repeated depending on the variety of roasted materials.1. Time for roasting: A problem arises in which Js'M cannot be achieved.

This invention was made in view of these points, and the 8i
To provide an automatic roasting device which can provide a time ga according to the type of roasted objects when repeatedly roasting different kinds of roasted objects, and can perform good repeated roasting operations of various kinds of roasted objects. It is something.

Another object of the present invention is to provide an automatic roasting device that can more accurately set a one-hour timer in response to various types of roasted objects.

[Means for Solving the Problems] The present invention includes a charging circuit consisting of a resistor and a capacitor, and when the charging voltage of the capacitor reaches a predetermined level, a resistor voltage divider circuit performs a switching operation on a PUT element to which a voltage is applied. In an automatic roasting device that uses a CR timer that has a discharge circuit that controls the discharge of the capacitor to control the energization time to the heater, the charging circuit is provided with an fJl changeover switch for switching the resistance value of the resistor into multiple stages, A second changeover switch for providing a plurality of parallel circuits of Zener diodes and resistors in the discharge circuit with different Zener voltages and resistance values of the resistors, and selectively connecting each of the parallel circuits in series to the PUT element. and I
Jl, the second changeover switch is operated according to the object to be roasted.

Further, the present invention provides a plurality of variable resistors in the resistance voltage divider circuit, and a third changeover switch that selectively connects each variable resistance to the circuit, and covers the first, second, and third changeover switches. The switching operation is performed depending on the roasted material.

[Function] In the present invention having such a configuration, the resistance value of the charging circuit can be set depending on the object to be roasted by switching the first and second changeover switches depending on the type of object to be roasted. Since the Zener voltage and resistance value of the Zener diode in the discharge circuit can be set according to the object to be roasted, it is possible to set the timer for one hour for each type of object to be roasted by changing the switch, and when roasting various objects to be roasted repeatedly. Depending on the type of roasted material, the amount of charge remaining in the capacitor for each repetition time interval can be set.

Further, according to the present invention, the voltage applied to the gate of the PUT element can also be set according to various kinds of roasted objects by switching the switch, and the discharge timing of the capacitor can be set according to various kinds of roasted materials.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

In the figure, 1 is a commercial AC power supply, and a circuit consisting of a lower heater 3 installed at the upper part of the refrigerator, a lower heater 4 installed at the lower part of the refrigerator, and a heater changeover switch 5 is connected to this power supply 1 via a start switch 2. Connected.

The heater changeover switch 5 is a double switch, in which the common contact C1 of one switch 51 is connected to the start switch 2, and the common contact C2 of the other switch 52 is connected to the start switch 2 via the upper heater 3. is connected to. Let one fixed contact of the one switch 51 and the other fixed contact of the other switch 52 be a common fixed contact to, and the common fixed contact t. is connected to one end of the power source 1 via the lower heater 4.

The other fixed contact t1 of the one switch 51 is a non-connecting contact, and the one fixed contact t of the other switch 52 is a non-connecting contact.
2 is directly connected to one end of the power source 1.

In the heater changeover switch 5, when the common contact C1 of one switch 51 is connected to the common fixed contact t0, the common contact C2 of the other switch 52 is connected to one fixed contact t.
2 and the common contact C1 of one switch 51
When the switch 52 is connected to the other fixed contact t, the common contact c2 of the other switch 52 is connected to the common fixed contact to.

Further, a power lamp 7 is connected to the AC power source 1 through the start switch 2 and a resistor 6 in series, and a first
A smoothing capacitor 10 is connected thereto. And this first
A second smoothing capacitor J2 is connected in parallel to the smoothing capacitor 10 through a resistor 11.

A CR timer 13 is connected to the second smoothing capacitor 12.

This CR timer 13 is connected to the second smoothing capacitor 12.
A charging circuit 14 is connected in parallel to the two.

This charging circuit 14 includes a resistor 15, a first two-contact changeover switch 16, each fixed contact 16 of this switch 16, . 16
It is constituted by a parallel circuit consisting of resistors 17 and 18 connected in parallel with each other via 2, and a series circuit consisting of a capacitor 19. A discharging circuit 20 is connected in parallel to the capacitor 19 of the charging circuit 14 at (-). 1st through
A parallel circuit of a second Zener diode 22 and a resistor 23 and a parallel circuit of a second Zener diode 24 and a resistor 25 are connected in parallel, and one end of this parallel circuit is connected to the capacitor 19 through a resistor 26 having a small resistance value. Connect to one end,
The other end of the parallel circuit is connected to the other end of the capacitor 19 via the anode and cathode of the PUT element 27.

In addition, a resistive voltage divider circuit 28 is connected to the second smoothing capacitor 12.
are connected in parallel. This resistance voltage divider circuit 28 includes a third two-contact changeover switch 29 and each terminal T of this switch 29.
Contact point 29. , 292, a parallel circuit consisting of variable resistors 30, 31 and resistors 32, 33 connected in parallel to each other.
．． It is composed of 34 series circuits.

The connection point between the resistors 32 and 33 of this resistance voltage divider circuit 28 is connected to the gate of the PUT element 27.

Furthermore, a solenoid 36 is connected in parallel to the second smoothing capacitor 12 via an NPN type transistor 35. A surge absorbing diode 37 is connected in parallel to this solenoid 36.

The base of the transistor 35 is connected to the connection point between the resistors 33 and 34. Note that a cancellation switch 38 is connected between the base and emitter of the transistor 35.

The first, second, and third changeover switches 16°21.2
The fixed contacts 16+, 21s, 29s and the fixed contacts 162, 212, 292 are operated to open and close by switching them. The resistor 17, 23, the first Zener diode 22, and the variable resistor 30 are set for roasting toast, for example, and the resistors 18, 25, the second Zener diode 24, and the variable resistor 31 are set for roasting pizza, for example. It is set for baking.

The start switch 2 is held closed by the operation of the solenoid 36, and is opened when this open holding is released.

In this embodiment with such a configuration, when the first, second, and third selector switches 16, 21, and 29 are set to the toast side, and the start switch 2 is turned on, the capacitor 19 is turned on via the resistor 15, 17. Charging will start. Further, the resistance voltage divider circuit 28 includes a variable resistor 30. Resistance 32,3
It consists of a series circuit of 3.34 and resistors 32 and 33.
A gate voltage is applied to the gate of the PUT element 27 from the connection point with the PUT element 27. Also, a certain voltage is generated at the connection point between resistors 33 and 34, turning on transistor 35, and solenoid 36
works. Even if the operation of the start switch 2 is stopped, the switch 2 is thereafter kept closed by the solenoid 36.

Further, energization is started to the upper heater 3 and the lower heater 4 via the heater changeover switch 5. Now, if the heater changeover switch 5 is connected as shown in the figure, the common contact c1 of one switch 51 is connected to the common fixed contact to, and the common contact C2 of the other switch 52 is connected to the fixed contact t2. The heaters 3 and 4 are connected in parallel to the AC power source 1, and generate heat with a large amount of electric power. In addition, the common contact C1 of one switch 51 of the heater changeover switch 5 is connected to the fixed contact t1, and the common contact C2 of the other switch 52 is connected to the common fixed contact t.
If connected to O, each heater 3゜4ζO will be connected in series to the AC power supply 1, and will generate heat with a small amount of electric power.

In this way, the toast is roasted by the heat generated by each of the heaters 3 and 4. When the charging voltage of the capacitor 19 reaches the gate voltage of the PUT element 27, the PUT element 27
becomes conductive, and the charge on the capacitor 19 first flows through the resistor 26 and the first
The voltage of the capacitor 19 is discharged through the Zener diode 22 and the PUT element 27, and the voltage of the capacitor 19 is
The voltage decreases rapidly to the voltage of Tsukuba University. Zener diode 22 of node 1 then becomes non-conductive, and the charge on capacitor 19 is now transferred to resistors 26, 23, . Discharge begins through the PUT element 27, and the voltage of the capacitor 19 slowly decreases.

Further, when the PUT element 27 becomes conductive, the voltage between the gate and cathode of the element 27 decreases, so the transistor 35 turns off and the operation of the solenoid 36 is stopped. As a result, the start switch 2 is opened, and the power supply to each heater 3, 4 is stopped, and the roasting operation is stopped. That is, the toast is roasted for a period of time from when the start switch 2 is turned on until the PUT element 27 becomes conductive due to the charging voltage of the capacitor 19.

In this way, when the first roasting operation is completed and the second roasting operation is performed at a relatively short time interval, the start switch 2 starts to be turned on before the charge in the capacitor 19 is completely discharged. The roasting time will be slightly shorter than the first time. In other words, 1. In the second roasting, the internal temperature of the roasting chamber is higher than in the first roasting, so
In anticipation of this, the timer is shortened by one hour, resulting in 1
The toast will be roasted to the same level of degree of toasting the second time.

In addition, when roasting pizza, the first, second, and third changeover switches 16, 21, and 29 are set to the pizza side, that is, the fixed contact 1
62, 212, 292. If the start switch 2 is turned on in this state, charging of the capacitor 19 is started via the resistor 15.18. Further, the gate voltage applied to the gate of the PUT element 27 is connected to a series circuit of a variable resistor 31 and a resistor 32, and a resistor 33 and a resistor 34.
This can be obtained by voltage division with a series circuit.

When the charging voltage of the capacitor 19 reaches the gate voltage, the charge of the capacitor 19 is then discharged via the resistor 28, the second Zener diode 24, and the PUT element 27, and the voltage of the capacitor 19 is further discharged from the second Zener diode 24. When the Zener voltage decreases to the Zener voltage of 1, the voltage is discharged through the resistor 25 instead of the diode 24.

In this way, the charging resistance of the charging circuit 14, the Zener voltage and discharging resistance of the discharging circuit 20, and the resistance of the resistance voltage divider circuit 28 can be changed depending on the items to be roasted, that is, toast and pizza. Even if the timer hour changes greatly, this can be easily dealt with by switching the resistor 17, 18 by switching the first changeover switch 16 and switching the variable resistor 30, 31 by the third changeover switch 29. Since the variable resistor connected to the tJ resistor voltage divider circuit 28 is changed depending on toast and pizza, the timer hour can be finely adjusted depending on each type, and the timer hour can be set more accurately.

In addition, the discharge characteristics of the charge in the capacitor 19 can be changed between toast and pizza by changing the Zener voltage and resistance, so when toasting and pizza are roasted continuously, the time interval may be different between toast and pizza. Even if the internal temperature varies, the discharge of the capacitor 19 can be controlled accordingly, so that various roasted items such as toast and pizza can be repeatedly roasted depending on the type.

In the above embodiment, the changeover switch 29 and two variable resistors 30 and 31 are provided in the resistance voltage divider circuit 28 to change the gate voltage of the PUT element 27 depending on toast and pizza, but the present invention is not necessarily limited to this. Instead, the changeover switch and one of the variable resistors may be omitted in the resistance voltage divider circuit 28. In this case, the remaining variable resistors may be replaced with ordinary resistors.

Further, in the embodiment described above, the first, second, and third changeover switches 1B, 21.29 are linked to each other, but the present invention is not necessarily limited to this.
Only the second changeover switch may be operated in conjunction, or all the changeover switches may be operated independently.

Further, in the above embodiment, two types of roasted items, toast and pizza, were described, but gratin or the like may be added to provide three or more types of roasted items. Of course, in this case, each changeover switch will have three or more fixed contacts, and the number of resistors and Zener diodes will also increase accordingly.

[Effects of the Invention] As detailed above, according to the present invention, when roasting different types of objects repeatedly, the time can be adjusted according to the type of the objects to be roasted. It is possible to provide an automatic roasting device that can perform repeated roasting operations well.

Further, according to the present invention, it is possible to provide an automatic roasting apparatus that can more accurately set a one-hour timer in accordance with various types of roasted objects.

[Brief explanation of the drawing]

The figure is a circuit diagram showing an embodiment of the invention. 3... Upper heater, 4... Lower heater, 13... CR timer, 14... Charging circuit, 16... First changeover switch, 17.18... Resistor, 19... Capacitor , 20... Discharge circuit, 21... Second switching switch, 22.24... Zener diode, 23,
25° resistor, 27...PUT element, 28...resistance voltage divider circuit, 29...third changeover switch, 30.31
...Variable resistance.

Claims (5)

[Claims] (1) CR having a charging circuit consisting of a resistor and a capacitor, and a discharging circuit that controls discharging of the capacitor by switching a PUT element to which a gate voltage is applied by a resistor voltage divider circuit when the charging voltage of the capacitor reaches a predetermined level. In an automatic roasting device that uses a timer to control the energization time to the heater, the charging circuit is provided with a first changeover switch for switching the resistance value of the resistor into multiple stages,
The discharge circuit is provided with a plurality of parallel circuits each including a Zener diode and a resistor with different Zener voltages and resistance values of the resistors, and each of the parallel circuits is selectively connected to the P
An automatic roasting apparatus characterized in that a second changeover switch is provided to connect the UT element in series, and the first and second changeover switches are operated in accordance with the object to be roasted. (2) The automatic roasting apparatus according to claim 1, characterized in that the first and second changeover switches have the same changeover contact and are interlocked with each other. (3) The automatic roasting apparatus according to claim 1 or 2, characterized in that a portion of the resistance voltage dividing circuit is a variable resistor. (4) A CR having a charging circuit consisting of a resistor and a capacitor, and a discharging circuit that controls discharging of the capacitor by switching a PUT element to which a gate voltage is applied by a resistor voltage divider circuit when the charging voltage of the capacitor reaches a predetermined level. In an automatic roasting device that uses a timer to control the energization time to the heater, the charging circuit is provided with a first changeover switch for switching the resistance value of the resistor into multiple stages,
The discharge circuit is provided with a plurality of parallel circuits each including a Zener diode and a resistor with different Zener voltages and resistance values of the resistors, and each of the parallel circuits is selectively connected to the P
A second changeover switch is provided for connecting in series to the UT element, and the resistor voltage divider circuit includes a plurality of variable resistors, and a third changeover switch is provided to selectively connect each of the variable resistances to the circuit; An automatic roasting apparatus characterized in that the first, second, and third changeover switches are switched depending on the object to be roasted. (5) The automatic roasting apparatus according to claim 4, wherein the first, second, and third changeover switches have the same changeover contacts and are interlocked with each other.