JPH0311616Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Field of Application) The present invention relates to a roasting device, for example, a toaster oven, and relates to a mounting structure for an electronic timer circuit.

(Prior Art) In this type of roasting apparatus such as a toaster oven, a timer is used to control the time period during which electricity is applied to the heater in order to adjust the degree of baking of the food. Conventionally, this timer is mostly a mechanical timer operated by a spring spring or the like, and when the roasting time set by this timer has elapsed, the timer automatically cuts off the power to the heater and roasts. There is a known method that terminates the . However, a method using an electronic timer suitable for short-time roasting has been developed. This electronic timer uses the charging time of the capacitor, and has the advantage that once the doneness is set, it can be baked repeatedly without having to set the baking time each time.

When incorporating such an electronic timer into a roasting device, a structure is adopted in which the electronic timer circuit section, which is made up of a printed circuit board, is installed inside a box-shaped circuit cover and then installed into the roasting device main body. was.

(Problems to be solved by the invention) In the roasting device using the electronic timer of the conventional structure described above, it is difficult to connect the electronic circuit wiring and adjust the electronic components after the main body is assembled. Additionally, when installed inside the main body, the electronic components will be affected by the temperature rise in the roasting chamber, making the timer characteristics unstable.
This had the problem of variations in roasting time.

The present invention was developed in view of the above-mentioned problems. Even after the main body is assembled, wiring connections and adjustment of electronic components of the circuit section including the electronic timer circuit can be easily made, and the circuit section of the electronic timer circuit can be easily installed. To provide a roasting apparatus which can be easily constructed, and furthermore, the electronic components of the timer circuit are not affected by the temperature rise in the roasting chamber, the timer characteristics are stable, and the set roasting time is uniform.

[Structure of the invention] (Means for solving the problems) The roasting apparatus of the present invention includes at least a main body having a roasting chamber in which a heater is arranged, and an electronic timer circuit for controlling the time period during which electricity is applied to the heater. The entire circuit section is comprised of an insulating partition plate directly attached to the outside of the lower surface of the main body, and a cover that protrudes outward and is removably attached to the lower surface of the main body. The circuit portion is covered with the cover.

(Function) In the roasting apparatus of the present invention, the circuit section consisting of at least a part of the electronic timer circuit is attached to the outside of the lower surface of the main body via a partition plate, so that there is no connection between this circuit section and the heater on the main body side. Connections can be easily made outside the main body even after the main body has been assembled, and since the circuit section is sandwiched between the partition plate and the cover, the circuit section can be securely attached. Furthermore, by removing the cover after assembly, inspection and adjustment of electronic components can be easily performed. Furthermore, since the circuit section is disposed on the outside of the lower part of the main body, it is not affected by the temperature rise in the roasting chamber, and the timer characteristics also operate stably, preventing variations in roasting.

(Example) Hereinafter, the present invention will be described in detail with reference to an example shown in the drawings.

FIG. 1 shows the entire roasting apparatus. In the figure, 11 is a main body, and inside thereof there is formed a roasting chamber 11a having a door 12 which can be opened and closed at the front. 13 is a decorative board, and a door body 12 is mounted on the front of the main body 11.
The decorative board 13 includes a knob 14 for switching power to the heater provided in the roasting chamber 11a, a knob 15 for setting the time of a mechanical timer operated by a spring or the like, and a power supply. A display 16, a knob 17 for setting the time of an electronic timer to be described later, and an operation knob 18 for operating the electronic timer are provided. Further, a cord reel 19 is provided on the side surface of the main body 11.

FIG. 2 shows the electric circuit of the roasting apparatus, and the schematic structure thereof will be explained below.

In the figure, reference numeral 21 is an alternating current power source that generates 100 VAC, which is supplied through a power cord (not shown) or the like.
A timer switch 2 is connected between both ends of this power supply 21.
Both upper and lower heaters 25 and 26 provided in the roasting chamber 11a and a heater power changeover switch 27 are connected through a parallel circuit between the roasting chamber 11a and the power switches 23 and 24. In addition, the timer switch 22
remains on for a period of time set with the knob 15 shown in FIG. Also, power switches 23, 24
is operated when the operating knob 18 in FIG. 1 is pressed down, and thereafter, as will be described later, the ON state is mechanically maintained by the magnet 29.
Furthermore, the changeover switch 27 is connected to the knob 14 in FIG.
Contacts a and b are switched by the operation, and the heater power is changed.

Connection point of power switches 23 and 24 and AC power supply 2
1, a lamp 32 for the power indicator 16 shown in FIG. 1 is connected via a resistor 31. Further, an electronic timer circuit section 33 surrounded by a dashed line is provided between these sections. The resistors 34, 35 and the diode 36 are for supplying DC power to the circuit section 33, and the capacitor 3 in the circuit section 33
7 are connected in series with each other.

The circuit section 33 will be described below, but since the present invention is not intended to focus on this circuit configuration, a detailed explanation of the connection relationship of the circuit will be omitted, and the functions performed by each section will be explained.

40 is a DC constant voltage power supply, breather resistor 41,
42, 43, capacitors 37, 44, Zener diodes 45, 46, etc. 48 is a time circuit, which includes a first time constant circuit consisting of a diode 49, a resistor 50, and a capacitor 51;
52, a volumetric volume 53, and a capacitor 54. Note that the volume 53 is
It is adjusted by the knob 17 shown in FIG. Here, the first time constant circuit capacitor 51 is discharged relatively slowly when the power is turned off due to the resistor 55 connected in parallel. Further, the capacitor 54 for the second time constant circuit is connected to the transistor 5
It has an instantaneous discharge circuit mainly composed of components 6 and 57, and instantaneously discharges in response to a signal from an output circuit 60, which will be described later. The output circuit 60 is controlled to be turned on by the charging voltage of the capacitor 54.
FET61 turns on when the power is turned on,
The main components are transistors 62, 63, and 64 which are turned off by the on operation of the FET 61, and the transistor 64 controls the excitation of the magnet 29.

Here, the operation of the circuit shown in FIG. 2 will be explained. When adjusting the electronic timer, after adjusting the value of the volume 53 with the knob 17 shown in FIG.
3 and 24 are turned on. By this operation, the upper and lower heaters 25 and 26 in the roasting chamber 11a are energized to heat the food. The lamp 32 is also energized to indicate that heating is in progress. Since the circuit section 33 is also energized, the DC constant voltage power supply 40
produces an output and energizes time circuit 48 and output circuit 60.

Each transistor 62, 6 of the output circuit 60
3 and 64 are immediately turned on when the power is turned on, as described above. Therefore, the magnet 29 is excited and the power switches 23 and 24 are kept in the on state by mechanical means, which will be described later.

In addition, in the time circuit 48, each capacitor 51, 5
4 are charged at predetermined time constants. After a predetermined period of time has elapsed, the FET of the output circuit is turned on by the charging voltage of the capacitor 54, and the other transistors 62, 63, and 64 are turned off. Therefore, the magnet 29 is de-energized, the mechanical hold on the power switches 23 and 24 is released and the switches are turned off, and the power to the heaters 25 and 26 is cut off. Further, when the transistor 64 is turned off, its collector side becomes H level for a moment,
The transistor 57 constituting the instantaneous discharge circuit is turned on. Therefore, the transistor 56 is also turned on, so that the electric charge stored in the capacitor 54 is instantly discharged. Note that the charge in the capacitor 51 is slowly discharged via the resistor 55.

Next time, when using it again with the same degree of baking,
Push down the knob 18 in FIG. 1 again. Then,
As in the previous case, the heaters 25 and 26 are energized, and the magnet 29 turns on the power switch 2.
3 and 24 are kept in the on state. Time circuit 48
In this case, the capacitors 51 and 54 are charged, but if not much time has passed since the last use, the capacitor 51 has not been sufficiently discharged, so charging is completed in a short time. Therefore, the charging time of the capacitor 54 is also shortened, and the heaters 25, 2
6 is also shortened. This is because the temperature in the roasting chamber 11a is still sufficiently high within a short time since the previous use, and in order to obtain the same roasting state as the previous time, the time during which the heaters 25 and 26 are energized must be shortened. It is. Therefore, regardless of the length of the interval between uses, the degree of baking set by the knob 17 can always be maintained.

Circuit section 3 surrounded by the dashed-dot line in Fig. 2 above
3 is wired to a printed circuit board 66 shown in FIG. 3, and is screwed to the lower surface of the main body 11, as shown in FIGS. 4 and 5, together with a partition plate 67 located above. 68 is a cover member, which covers the circuit section 3
3 is formed so as to cover the entire printed circuit board 66 on which the circuit board 3 is wired, and together with the partition plate 67, the circuit section 33 on the printed circuit board 66 is sandwiched and held at the step section 68a on the periphery.

Here, the printed circuit board 66 is provided with a corresponding opening 70 so that the overall height including the cover member 68 does not become higher than necessary due to some large electronic components 69 such as capacitors. A large electronic component 69 is arranged inside. Further, a notch 71 for a lead wire is provided at one side edge of the printed circuit board 66, and the lead wire is connected around this notch 71. Further, the partition plate 67 is provided with a recess 72 opening on one side edge thereof at a position corresponding to the notch 71, and is integrally provided with a rising portion 73 rising from the periphery of the recess 72 toward the main body 11. Of course, the bottom plate of the main body 11 is also provided with a notch 74 for passing the rising portion 73 therethrough. The printed circuit board 6 is disposed inside the cover member 68.
A cradle rib 75 is provided to support the large electronic component 69 provided at 6 from below to prevent the large electronic component 69 from shifting due to vibration or the like. Further, an engaging piece 77 is integrally provided on one side, which is inserted from below into a slit 76 formed in the bottom plate of the main body 11.
Furthermore, a screw fixing piece 78 having a screw hole on the other side
are provided in one piece. Further, on the side of the partition plate 67 facing the rising portion 73, a rising protrusion 79 is integrally provided to cover the vertical gutter formed by the rising portion 73 and the recess 72.

A mounting plate 81 bent into a substantially L shape is provided on the inside of the decorative board 13 shown in FIG.
Here, the timer switch 2 explained in Fig. 2 is shown.
2 built-in timer 82, changeover switch 27,
All parts such as the magnet 29, the interlocking switch 83 containing the power switches 23 and 24, the volume board 84 having the volume 54, and the lifting platform 85 are installed as shown in FIGS. 4, 5, and 6. and are electrically and mechanically linked.

As shown in FIG. 7, in addition to the volume 53, a lamp 32, a resistor, etc. are fixed to the volume board 84 by soldering, and are fixed to the mounting plate 81. Note that the cut-and-raised mounting piece 8 of the mounting plate 81
A lamp cover 86 is attached to 1a facing the lamp 32. In addition, the lifting platform 85
has a horizontal support piece 85a integrally at the upper and lower parts, and has an elevating lever 87 riveted to the middle part of the lower part, and the operating knob 18 shown in FIG. 1 is attached to the tip of this elevating lever 87. It will be done. Then, on the back side of the mounting plate 81, as shown in FIG. 4 and FIG.
By penetrating through a, it is supported by this elevating shaft 88 so that it can be raised and lowered. Further, as shown in FIGS. 4 and 5, below this elevating table 85,
5 is provided with a spring 89 that applies an upward force to the movable contact piece 83a of the interlocking switch 83.
The insulating actuating part 83b provided in the
The interlock switch 83 is configured to be turned on when the switch 83 is lowered. Furthermore, as shown in FIG. 5, a weight plate 90 is attached to the upper part of the lifting table 85, so that a bell of the timer 82 is struck when the lifting table 85 is raised.

The magnet 29 is placed on the lower side of the lifting shaft 88, as shown in FIG. The support piece 81b is movably attached to the groove 91 of the support piece 81b cut and raised from the bottom surface of the attachment plate 81 as shown in FIG. 8 by means of a substantially T-shaped hook 92.

93 is a hook lever, as shown in FIG. 4, it has a hook portion 94 that receives and locks the lifting lever 87, and an adsorption portion 95 that is adsorbed to the lower surface of the magnet 29; As shown, it is rotatably supported by a horizontally disposed shaft 96. In this hook lever 93, the suction portion 95 is normally separated below the lower surface of the magnet 29 due to weight balance, and the hook portion 94 is stopped in a state in which it faces diagonally upward and can receive the lift lever 87.

In the above configuration, the operation knob 1 shown in FIG.
8 is pushed down, the elevating lever 87 integrated therewith applies a downward moving force to the elevating table 85. Therefore, the elevating table 85 descends along the elevating shaft 88, operating the interlocking switch 83, and turning on the built-in power switches 23 and 24 shown in FIG. By this operation, the heaters 25 and 26 in the roasting chamber 11a are energized, and the magnet 29 is turned on.
is excited. Further, the elevator lever 87 that has been lowered by the above operation is attached to the hook portion 94 of the hook lever 93.
4, and is rotated counterclockwise around the shaft 96 as shown in FIG. At this time, the magnet 29 is excited as described above, and attracts and holds the attracting portion 95. For this reason, the lift lever 87
Even if the lift lever 87 is released, the lift lever 87 is engaged and held by the hook portion 94 of the hook lever 93 as shown in the figure, and does not rise. Therefore, power switch 2 in Fig. 2
3 and 24 maintain the on state.

When the magnet 29 is demagnetized after a predetermined period of time has elapsed, the hook lever 93 loses its holding force against the adsorption portion 95, so that it rotates clockwise in FIG. Release the engagement and hold against. Therefore, the lifting platform 85 is driven upward by the spring 89, and the interlocking switch 8
Restore 3. As a result of this operation, the power switches 23 and 24 shown in FIG. 2 are turned off, and the heater 2
Stop the power supply to 5 and 26. Further, as the lifting table 85 moves upward, the weight plate 90 provided on the lifting table 85 strikes the bell of the timer 82, indicating the end.

Here, since the circuit section 33 wired to the printed circuit board 66 is attached to the lower surface of the main body 11 via the partition plate 67, the circuit section 33 can be connected by removing the cover member 68 even after the main body 11 is assembled. Since the entire portion 33 is exposed to the outside, wiring connection work and inspection and adjustment of electronic components can be performed as desired. Further, since the assembly can be carried out using a large external space, it is easier than working inside the narrow main body 11.

[Effect of idea]

According to the present invention, even after the main body is assembled,
It is possible to easily connect the wiring of the circuit section including the electronic timer circuit and adjust the electronic components on the outside of the main body, and the circuit section of the electronic timer circuit can be easily and securely installed. The electronic components are not affected by the temperature rise in the roasting chamber, and the timer characteristics are stable and there are no variations in the set roasting time.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of the roasting apparatus according to the present invention, Fig. 2 is a circuit diagram showing the configuration of the electric circuit of the one shown in Fig. 1, and Fig. 3 is the one shown in Fig. 1. Exploded perspective view showing main part configuration, Figures 4 and 5
6 and 6 are cutaway front views, side views, and plan views showing the main parts of FIG. 1, FIG. 7 is a partial view showing the mounting structure of the volume board in FIG. 1, and FIG. FIG. 2 is an exploded perspective view showing an example of a magnet mounting configuration. 11... Main body, 25, 26... Heater, 33...
...Circuit section, 67...Partition plate, 68...Cover member.

Claims (1)

[Claims for Utility Model Registration] A main body having a roasting chamber in which a heater is arranged, and a circuit section configured as at least a part of an electronic timer circuit for controlling energization time to the heater, the main body The entire circuit section is sandwiched and held between an insulating partition plate directly attached to the outside of the lower surface and a cover that is detachably attached to the lower surface of the main body and protrudes outward, and the circuit section is covered by this cover. A roasting device featuring a tsuta.