JPS6018187Y2 - coffee maker - Google Patents

Description

[Detailed description of the invention] This invention relates to a coffee maker equipped with a printed circuit board, and is designed to suppress the rise in temperature of the printed circuit board due to heat from the heating section, thereby protecting the electrical components on the circuit board from heat. .

Embodiments of the present invention shown in the drawings will be described in detail below.

First, in FIGS. 1 to 4, a coffee maker main body 1 is composed of a base 2, an exterior body 3, an upper cover 4, etc., and a mill assembly 5, a cartridge tank 6, and a coffee container 7 are installed therein.

The base 2 is made of a synthetic resin product, and has a heating part made of a heating plate 8, a heater 9 such as a sheathed heater integrated with this, and a heating pipe 10 on the side thereof, and has a heat-insulating part on the heating part. A plate 11 is arranged.

The heating section heats the coffee container 7 via the heat insulating plate 11 to keep the coffee liquid warm, and also heats the filtrate flowing through the heating pipe 10 to raise its temperature.

Further, a thermostat 12 and a temperature fuse 13 are installed at appropriate locations in the heating section.

A motor installation part 15 for fixing a mill motor 14 together with the exterior body 3 is integrally and protrusively molded on the upper surface of the middle part of the base 2.

Further, on both sides of the intermediate portion of the base 2, that is, on both ends of the motor installation portion 15, a display printed circuit board 16 and a power supply printed circuit board 17 are erected with their lower ends fixed with screws so as to face each other.

The display printed circuit board 16 includes a timer display section 181 using a digitron that displays the current time and alarm time (operation start time), a fast forward button switch 19, a transportation rebutton switch 20, a set button switch 21, a main switch 22, It is mainly equipped with parts for display and operation, such as a notification switch 23, a green light emitting diode 24, a red light emitting diode 25, and a frequency setting jumper wire 26.

When the main switch 22 is switched to the "timer" side, it starts the timer operation, when it is switched to the "off" side, electricity is cut off to the heater 9, and when it is switched to the "on" side, the heater 9 is constantly energized. This is a two-circuit, three-contact switch.

The notification switch 23 is a seesaw type switch that selects whether or not to generate a notification sound to notify the completion of extraction of coffee liquid, and the notification sound can be stopped by switching to the "off" side even when the notification sound is being generated. can do.

The light emitting diode 24 is lit to indicate that the timer is operating, and the light emitting diode 25 is lit to indicate that the heater 9 is being energized.

The jumper wire 26 is longer than a normal jumper wire and bent into a dogleg shape, and normally the time base of the timer is set at 50 Hz, and the time base is switched to 60 Hz by cutting.

In this way, the frequency can be switched depending on whether or not the jumper wire 26 is cut, so a dedicated switch is not required, and costs can be reduced.

The power supply printed circuit board 17 includes a transformer 27 and a relay 2.
It is mainly equipped with parts for power supply and notification, such as 8 and buzzer 29.

The printed circuit board 17 has the heaviest transformer 27 located at the bottom, and a part of the transformer 27 is brought into contact with the upper surface of the base 2, so that only the lower end thereof is fixed. The upright state can be maintained reliably, there is no need to fix it to the exterior body 3, and the number of screw-fastening points can be reduced (see FIG. 5).

On the lower surface of the base 2, one end of a heating pipe 10 is extended from the heating section to the other side.

In addition, the base 2 has a heating section and each printed circuit board 16 on the bottom surface.
．． 17 and the heating pipe 10 and each printed circuit board 16.1
Partition walls 30 and 31 located between 7 are integrally protruded,
These partition walls 30 and 31 form a heating section and a heating pipe 10.
This prevents the heat from directly acting on the printed circuit boards 16 and 17, thereby suppressing the temperature rise of the printed circuit boards 16 and 17.

The exterior body 3 is made of a synthetic resin product, and is placed on the base 2 to cover the motor installation part 15 and each printed circuit board 16, 17.

This exterior body 3 has an operation surface 32 formed at an appropriate location on the outer surface, and a timer display window 33 is formed on this operation surface 32, and operation holes are provided to allow the buttons or heirs of each switch 19 to 23 to face outward. and each light emitting diode 24
．． A display hole is formed so that 25 faces outward.

Incidentally, a rubber sheet 34 of a size that can always close the operation hole is provided on the eldest child 22' of the main switch 22, and this rubber sheet 34 closes the operation hole from the inside to prevent water from entering and to prevent viewing. I'm doing well.

Further, the exterior body 3 forms a mounting part 35 on one side on which the cartridge tank 6 is removably mounted, and this mounting part 3
A connecting port 36 connected to the extended end of the heating pipe 10 is formed in the center of the bottom surface of the heating pipe 5 .

Thus, while the tank 6 is placed on the mounting portion 35, the water inlet 37 is connected to the connection port 36, thereby communicating with the heating pipe 10.

Furthermore, the exterior body 3 is adjacent to the mounting portion 35 and the mounting portion 3
A storage recess 38 for storing the mill assembly 5 is formed at a higher location than the mill assembly 5.

The mill assembly 5 includes a mill container 39 forming a grinding chamber, a rotating shaft 42 that penetrates the bottom wall of the container 39 and has a cutter 40 at its inner end and a connecting portion 41 at its outer end, and an opening on the top surface of the mill container 39. The cutter 40 is connected to the motor shaft side when housed in the storage recess 38.

The mill motor 14 is clamped and fixed between the motor installation part 15 of the base 2 and the bottom wall of the housing recess 38 of the exterior body 3, with the motor shaft protruding into the housing recess 38.

Further, this motor 14 has an elastic body 44 made of polyurethane or the like interposed between it and the motor installation part 15, and an elastic body 45 made of rubber or the like between it and the bottom wall of the storage recess 38, so that the hardness of the elastic body 44 can be adjusted by adjusting the hardness of the elastic body 44. The motor 14 is made smaller in hardness than the body 45.
This is to reduce vibration and chatter noise caused by the rotation of the cutter 40, that is, the rotation of the cutter 40.

In other words, since the elastic body 44 has more flexibility than the elastic body 45, the vibration of the motor 14 will vibrate with the elastic body 45 as a fulcrum, and the vibration at the connection between the motor shaft and the connection part 41 will be reduced. , vibration noise and chatter noise will also be reduced.

In the figure, 46 is a coffee basket installed on the coffee container 7, 47 is a pouring pipe 48 which is vertically installed in the exterior body 3, and has one end connected to the heating pipe 10 and the other end opened onto the coffee basket 46. indicates the lid of the cartridge tank 6.

Next, to explain the electric circuit diagram in Fig. 7, AC 1
A series circuit consisting of a mill motor 14, a momentary type mill switch 49, and a current fuse 50 is connected in parallel to the 00V power supply.

Note that C is a capacitor for noise prevention. Further, a series circuit including a heater 9, a thermostat 12, and a temperature fuse 13 housed in the base 2 is further connected in parallel to the power source.

The transformer 27 supplies DC power to the timer display section 18 and other control circuits.

51 counts the power supply frequency 50H2 or 60Hz as a time base, divides the frequency to create minutes and hours, and uses a well-known output decoder driver to display the timer display section 18.
This LSI is equipped with a clock function to display a timer and a timer function to start energizing the heater 9 at a certain time.

The ON time by this timer is set to 5 minutes.

52 is N connected to the alarm output terminal 53 of 6■ above.
It is a PN transistor, with AC 100 on the collector side.
A relay 28 having a relay contact 28' for rONJ or rOFFJ the power source v to the heater side is connected.

The light emitting diode 24 is connected between the power supply VSS (+) and the emitter of the NPN transistor 52, and the light emitting diode 25 is connected between the power supply VSS (+) and the collector of the NPN transistor 52.

54 is a notification circuit for operating the buzzer 29 to notify the completion of extraction of coffee liquid, and both terminals are connected to the thermostat 12.
and is connected to both ends of the series circuit of the fuse 13.

Reference numeral 23 denotes the aforementioned notification switch, and 26 denotes the aforementioned frequency setting jumper wire.

Next, the operation will be explained.

Before using your coffee maker, adjust it to the power frequency you will be using.

If it is 50Hz, leave jumper wire 26 as is, and connect 60Hz.
If it is Hz, the jumper wire 26 is cut.

First, when power is applied to the coffee maker, as can be seen from the circuit shown in Figure 7, the position of the main switch 22 (
The LSI 51 is energized and the clock function operates.

In this state, if the mill switch 49 is pressed, the mill motor 14 will rotate.

As the power is turned on, r12:OOJ is displayed blinking on the timer display section 18, requesting time adjustment.

This blinking is stopped by a time setting operation described later, and the current time is displayed on the display section 18.

When setting the time, turn the main switch 22 to the "off" or "on" side as shown in FIGS. 6a and 6c.

Then, for fast forwarding, press the fast forward button switch 19 and set button switch 21 at the same time, and for slow forwarding, press the slow forward button switch 20 and set button switch 21 at the same time to set the displayed time on the display section 18 to the current time. match.

This time is kept accurate thereafter until the power is turned off.

Next, when setting the timer, use the main switch 2 above.
2 to the "timer" position as shown in Figure 6.

In this state, the current time is still displayed on the display section 18.

If you press the set button switch 21 here, the display section 18
The time is displayed on the timer.

To set the timer one time, press the fast forward button switch 19 and set button switch 21 for fast forwarding, and the slow rebutton switch 20 and set button switch 21 for slow forwarding, to set the time displayed on the display section 18 to the timer one time. Match.

This set button switch 21 is the current time set when the button switch 19 or 20 is touched by mistake.
Alternatively, it serves to prevent the timer time from easily changing.

When the timer is set to the time in this way and the push of the set button switch 21 is released, the current time is displayed on the display section 18.

When time passes in this state and the current time coincides with the timer one time, the LSI 51 generates an alarm output and supplies it to the base of the transistor 52, the subsequent operation of which will be described later.

Here, a case will be described in which coffee liquid is extracted immediately without using the timer function.

First, put the coffee beans into the mill assembly 5 and switch the mill switch 49.
is pressed to operate the mill assembly 5 to produce coffee powder and store it in the coffee basket 46, and at the same time fill the tank 6 with water and set it as shown in FIG.

Next, the main switch 22 is switched to the "on" side as shown in FIG. 6C, and the relay 28 and the light emitting diode 25 are energized.

As a result, the diode 25 emits red light to notify that the coffee maker is operating, and the relay switch 28'
is switched from the NC contact to the NO contact to start energizing the heater 9.

A notification circuit 54 is connected to this circuit, but since it is short-circuited by the thermostat 12 and the fuse 13, the notification circuit 54 does not operate regardless of whether the notification switch 23 is on or off.

After the heater 9 is energized, a well-known coffee liquid extraction operation is performed, and as the temperature of the heating section rises after the coffee liquid extraction is completed, the thermostat 12 is activated and the energization to the heater 9 is stopped.

When the notification switch 23 is in the "on" position, the heater 9 and the notification circuit 54 are connected in series, so current flows to the notification circuit 54 via the heater 9 and the piezoelectric buzzer 2
9 generates a notification sound.

In this case, since the current passing through the heater 9 is in the milliampere unit, the heater 9 itself generates almost no heat.

When the temperature of the heating section decreases, the thermostat 12 is turned on again and the heater 9 is energized again to keep the coffee liquid warm, but in this case both ends of the notification circuit 54 are short-circuited, so the piezoelectric buzzer 29 is Operation stops.

Since this operation is repeated thereafter, the coffee liquid is maintained at a predetermined temperature and the notification sound is repeatedly and intermittently generated.

Note that when the notification switch 23 is turned off, no notification sound is generated at all.

To stop the operation of the coffee maker, turn the main switch 22 to "off" and stop energizing the relay 28 and light emitting diode 25, then switch the relay switch 28' to the NC side and turn off the heater 9 and the alarm sound. The power supply to the generation circuit 54 may be stopped.

Next, use the timer function to wake up at 6:00 AM, for example.
The case where coffee liquid extraction is automatically performed at 0 will be explained.

First, turn the main switch 22 to the "off" side and turn on the "timer".
When switched to the side, the generation diode 24 (green) lights up to notify that the timer is in operation.

Here, in addition to the timers mentioned above, set the timers A, M,
6: Set to 00.

Next, water is poured into the tank 6, and coffee powder is placed in the coffee basket 46, which is set as shown in FIG.

In this way, at 6:00 A.M., an alarm output is generated as described above and the transistor 52 is turned on.

Accordingly, the light emitting diode 25 emits red light and the relay 28 is activated to switch the relay contact 28' to the NO side and energize the heater 9.

The subsequent operations are exactly the same as those described above without using the timer function, and if the notification switch 23 is turned on, a notification sound will be generated when coffee liquid extraction is completed.

Therefore, this notification sound can also be used as an alarm.

Incidentally, since the ON time according to the timer is 59 minutes, the alarm output disappears when 5 powders have elapsed from the set time, and the power supply to the coffee maker is automatically stopped.

In this case, when the mill switch 49 is pressed while the coffee maker is not operating due to the timer, the mill motor 1
4 can rotate to operate the mill.

Also, when the main switch 22 is switched to the "on" side,
The coffee maker is now energized continuously and can be operated completely independently of the timer operation.

At this time, even if the mill switch 49 is pressed, the mill motor 14 does not rotate, so the mill does not operate.

The ON time according to the above-mentioned timer is 59 minutes, and if it is not reset, it will turn ON again two moments later and operate repeatedly.

Therefore, it is very convenient for people who have a habit of drinking coffee every morning, as there is no need to set the timer every time.

According to the coffee maker of the present invention having the above structure, the partition wall is integrally provided on the lower surface of the base, and this partition wall prevents the heat of the heating section from spreading to the printed circuit board side, so the structure is extremely simple. This makes it possible to suppress the rise in temperature of the printed circuit board, protect electrical components on the board from heat, and prevent adverse effects of heat.

[Brief explanation of drawings]

Figure 1 is an external perspective view of the proposed coffee maker, Figure 2 is a vertical cross-sectional configuration diagram of the same, Figure 3 is a bottom view of the same, Figure 4 is an explanatory diagram of the internal configuration of the same, and Figure 5 is a diagram of the printed circuit board for the power supply. FIGS. 6A to 6C are diagrams illustrating the state of the main switch, and FIG. 7 is an electrical circuit diagram illustrating the mounting structure. 2: Base, 9: Heater, 10: Heating pipe, 16.1
7: Printed circuit board, 30: Partition wall.

Claims (1)

[Scope of utility model registration request] The base comprising a base made of synthetic resin, a heating section provided on the lower surface of the base, and a printed circuit board attached to the base and facing below the base at a position away from the heating section. A coffee maker characterized in that a partition wall is integrally provided on the lower surface of the base between the heating section and the printed circuit board to prevent the heat of the heating section from spreading to the printed circuit board side.