JPS6345213B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a load driving device that drives a load for an arbitrarily selectable period of time.

For example, some coffee mills have a cutter placed inside a case in which coffee beans are stored, and this cutter is rotated by a motor as a load to grind the coffee beans and obtain coffee powder. A coffee mill with such a configuration has a property that the coarseness of the coffee powder produced differs depending on the length of time the motor is energized. However, such coffee mills have conventionally been configured to energize the motor only while a manual switch is turned on, or to set the energization time of the motor to an arbitrary time using a clockwork timer. This makes it possible to obtain coffee powder milled to a desired roughness. However, the former configuration using a manual switch has the disadvantage that the mill time (motor energization time) is influenced by the operator's intuition and is not constant; The problem was that it became inaccurate, and the Yabari mill time became inconsistent.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to be able to accurately set the drive time of a load for a desired time, to simplify the time setting operation, and to make the time setting operation easier when setting a specific drive time. The object of the present invention is to provide a load driving device that can be made more accurate.

Hereinafter, an embodiment in which the present invention is applied to a coffee maker having a mill mechanism will be described with reference to the drawings.

First, the overall structure of the coffee maker will be described according to FIG. Reference numeral 1 denotes a container body, which includes a mill mechanism 2, a drip mechanism 3 which is a hot water supply mechanism that drips hot water into ground coffee powder to produce coffee liquid, and a cup 4 that stores the generated coffee liquid. These will be explained in detail below. That is, a motor storage part 5 and a cup mounting table 6 are formed on both left and right sides of the lower half of the container 1, and a case mounting part 7 and a water storage tank 8 are formed on both left and right sides of the upper half.
are formed respectively. Reference numeral 9 denotes a heating plate disposed in close contact with the lower surface of the heat insulating plate 6a attached to the cup mounting table 6, in which an electric heater such as a sheathed heater 10 and a heating pipe 11 are buried in parallel, and one end of the heating pipe 11 is buried therein. The water supply pipe 12 is extended upward and connected to a water outlet (not shown) of the water storage tank 8.
Moreover, the other end is extended to the upper part of the case mounting part 7 to form a hot water supply pipe 13. Reference numeral 14 denotes a case attached to the case attachment part 7, which is common to both the mill mechanism 2 and the drip mechanism 3 described above. The drive shaft 16 is rotatably and watertightly inserted therethrough. A cutter 17 for grinding coffee beans is attached to the upper end of the drive shaft 16, and a joint 18 is attached to the lower end of the drive shaft 16, and this joint 18 is connected to a joint 20 of the motor 19 as a load, which is placed in the motor housing 5. It is connected to 21 is case 14
A filter for filtration is mounted below the cutter 17 by a frame-shaped filter support 22 and a watertight member 23, and is adapted to receive coffee powder ground by the cutter 17.
Reference numeral 24 denotes an extraction port formed in the bottom wall 14a of the case 14, which corresponds to the cup mounting table 6 from above. Reference numeral 25 denotes a lid removably attached to the upper opening of the case 14, which has an annular wall 25a protruding from its approximate center and a pouring hole located inside the wall 25a. 25b is formed. Reference numeral 26 denotes a lid body, which is removably attached to the case mounting portion 7, which is the top opening of the container body 1, and the top opening of the water storage tank 8. Reference numeral 27 denotes a temperature regulating bimetal switch attached to the lower surface of the heating plate 9, by which the temperature of the heating plate 9 is controlled to a predetermined value.

Now, FIG. 2 shows only the portions of the electric circuit configuration of the above-mentioned coffee maker that are directly related to the gist of the present invention, and will be described below. That is, 28 is an AC power supply, and a switching element such as a triax 29 is connected between both terminals of the AC power supply.
and the series circuit of the motor 19 is connected. 30
is a pulse generator, which includes a shaping circuit 31 that shapes the waveform of the output of the AC power supply 28, and this shaping circuit 31.
The frequency dividing circuit 32 divides the output of the count pulse Pc at a period of 1 Hz, for example.
It is configured to output . 33 is a set switch that is turned on only in the manual operation state, and only when this switch is turned on, the AND circuit ₃ is connected via line L1.
A high level signal is applied to one input terminal of 4. The other input terminal of the AND circuit 34 is connected to receive the counting pulse Pc, and therefore, the AND circuit 34 passes the counting pulse Pc only during the ON period of the set switch 33. 35 and 36 are AND circuits in which one input terminal of each is connected to the output terminal of the AND circuit 34, and the output terminal of the AND circuit 35 is connected to the OR circuit 3.
7 to the clock input terminal CK of the up counter 38. Above counter 3
For example, 8 is in hexadecimal and its clock input terminal
It adds and counts the pulses input to CK and outputs the counted contents as a digital signal Sn. For example, 2 39 is composed of a 7 segment light emitting diode, etc.
digit digital display, this is the digital signal
Receives Sn as input and displays the corresponding numerical value. 40 is a comparator, which compares the digital signal Sn with the reference value signal Sc from the reference value generator 41, and only when they match, outputs a match signal Sa consisting of a high level signal, and outputs a match signal Sa consisting of a high level signal, and outputs a low level signal. In this case, the reference value signal Sc corresponds to a specific numerical value, for example "12", and therefore the comparator 40 corresponds to the numerical value "12".
In other words, when the digital signal ``12'' is displayed on the digital display 39, the matching signal Sa is output. and,
The output of the comparator 40 is connected to the AND circuit 35.
is applied to the input terminal of via the inverter 42,
It is also connected to the input terminal of the AND circuit 36 so as to be directly applied thereto. 43 is AND circuit 3
This is a flip-flop that receives the output from the output terminal Q at the input terminal T, and is configured so that the output from the output terminal Q is inverted every time a pulse is applied to the input terminal T. and is connected to the clock input terminal CK of the up counter 38. On the other hand, 44 is a start switch that is turned on only in the manual operation state, and when this is turned on, the transfer gate 4 is connected via line _L2 .
A high level signal is given to the control terminal 45a of No. 5. The transfer gate 45 exhibits a low impedance only when a high level signal is input to its control terminal 45a, allowing the signal to pass through. 46 is a down counter having a preset function that constitutes the drive circuit 47 together with the triax 29, transfer gate 45, etc., and when a digital signal is input to its data input terminal D, the down counter sets a numerical value corresponding to the input digital signal. The preset value is preset, and each time a pulse is input to the clock input terminal CK, the preset value is subtracted from the preset value. Furthermore, this down counter 46 is configured to output an operation command signal So consisting of a high level signal during a period when its count value is other than "0", and the output terminal P of this down counter 39 is connected to the buffer amplifier 48. It is connected to the gate of the triac 29 via. Further, the data input terminal D of the down counter 46 is connected to the output terminal of the up counter 38 via the transfer gate 45.
Clock input terminal CK is connected to the output terminal of AND circuit 49. One input terminal of the AND circuit 49 is connected to receive the counting pulse Pc, and the other input terminal is connected to receive the operation command signal So. still,
The set switch 33, start switch 44, and digital display 39 described above are arranged on the side of the container 1, for example, as shown in FIG.

Next, the operation of this embodiment having the above configuration will be explained. When producing coffee liquid, water storage tank 8
For Case 1, add enough water for the desired number of people.
4 respectively store coffee beans in corresponding amounts, first, a power switch (not shown) is turned on, and a set switch 33 is turned on and kept in the on state. In this case, the up counter 38 outputs a digital signal Sn corresponding to, for example, "0", and the comparator 40
is outputting a low level signal, AND receives the low level signal via the inverter 42
The circuit 35 is in a state where the signal is allowed to pass, and the AND circuit 36, which directly receives the low level signal, is in an off state. For this reason, set switch 3
3, the counting pulse Pc from the pulse generator 30 is applied to the clock input terminal CK of the up counter 38 via the AND circuits 34, 35 and the OR circuit 37, which adds and counts the counting pulse Pc. The content of the count is then output as a digital signal Sn. At this time,
On the digital display 39, the numerical values corresponding to the digital signal Sn are "0" → "1" → "2" → "3".
...is displayed in increasing steps, but the step speed is determined by the counting pulse Pc.
Since the output period of is 1 Hz, it becomes "1" every second. And the AND circuit 34 is added to the up counter 38.
When the 12 counting pulses Pc that have passed through the counter 38 are inputted and the digital signal Sn corresponding to the number "12" is output from the up counter 38, the number "12" is displayed on the digital display 39, and A match signal Sa (high level signal) is output from the comparator 40. Then, this coincidence signal Sa is sent to inverter 4.
2, the AND circuit 35 which receives the counting pulse Pc becomes disconnected and blocks the passage of the counting pulse Pc, and the AND circuit 36 receives the counting pulse Pc instead.
will now be allowed to pass through. Then, the 13th counting pulse Pc that passed through the AND circuit 34 is AND
When applied via circuit 36 to input terminal T of flip-flop 43, flip-flop 43 is inverted so as to output a low level signal from its output terminal Q. For this reason, the up counter 38 does not make any progress in its count, and therefore keeps outputting the digital signal Sn corresponding to the numerical value "12". Naturally, the numerical value displayed on the digital display 39 is also "12". ” and do not step. Thereafter, when the 14th counting pulse Pc that has passed through the AND circuit 34 is applied to the flip-flop 43 via the AND circuit 36, the output of the flip-flop 43 is inverted to a high level signal, so this high level signal The count value of the counter 38 increases from "12" to "13". Then, comparator 4
A low level signal is output from 0 again, returning to the original state, and the numerical value displayed on the digital display 39 is again stepped every second to "13" →
The number increases sequentially as "14" → "15" → "0" → "1"... That is, when the set switch 33 is turned on to step through the numerical values displayed on the digital display 39, only the numerical value "12" is displayed twice as long as the other numerical values. The above numerical value "12" was determined based on the milling time that is most frequently and commonly performed by the mill mechanism 2, for example, 12 seconds, so in reality it may be any other numerical value, or multiple numerical values may be used. It may be possible to display the value longer than the value of .

Thus, while visually observing the numerical value displayed on the digital display 39 as described above, the operator releases the ON operation of the set switch 33 when the displayed value reaches an arbitrary value, for example, "12". When the ON operation of the set switch 33 is released in this way,
Since the high level signal is no longer output to the line _L1 and the AND circuit 34 blocks the passage of the counting pulse Pc, the up counter 38 stops the counting operation and outputs the final counting result as the counted value. ``12'' is stored, and a digital signal Sn corresponding to the count value ``12'' is output. Therefore, at this time, the digital display 39 continues to display "12". After that, when the start switch 44 is turned on, the transfer gate 4
Since the digital signal Sn stored by the up counter 38 is given to the data input terminal D of the down counter 46, the down counter 46 corresponds to the input digital signal Sn. At the same time, the operation command signal So is output from the output terminal P. Then, the triax 29, which receives the operation command signal So at its gate via the buffer amplifier 48, is turned on and the motor 19 is energized, so the cutter 17 is rotated and the grinding of the coffee beans in the case 14 is started. At the same time, the operation command signal So is applied to one input terminal of the AND circuit 49, and the counting pulse Pc applied to the other input terminal of the AND circuit 49 passes through it. The down counter 46, which receives the counting pulse Pc at its clock input terminal CK, starts a subtractive counting operation. Such a subtraction counting operation is performed when the preset value "12" is set.
The count value is "12" →
It will gradually decrease from "11" to "10"...
When the count value of the down counter 46 becomes "0", the operation command signal So
Since a low level signal is output instead of
7 stops, and at the same time the grinding of the coffee beans is completed, the AND circuit 49 is turned off and the counting pulse Pc is sent to the down counter 46.
input is stopped. Therefore, the time it takes for the count value of the down counter 46 to go from "12" to "0" is because the output cycle of the count pulse Pc is 1Hz.
Therefore, the grinding time (mill time) of coffee beans as described above is controlled to 12 seconds. After the coffee beans are ground in this manner, when the cup 4 is placed on the heat retaining plate 6a of the cup mounting table 6, the opening on the top surface of the cup 4 corresponds to the extraction port 24 of the case 14. Then, when the hot water supply operation switch (not shown) is turned on, the bimetal switch 27
The sheathed heater 10 is energized and starts to generate heat, and based on this, the cup 4 is preheated by the heat insulating plate 6a, and the heating pipe 11 supplied from the water storage tank 8 through the water supply pipe 12
The water inside is heated to produce hot water. The hot water thus generated rises through the hot water supply pipe 13 due to its boiling pressure, and reaches the hot water supply port 13a at its tip.
The hot water is supplied to the inside of the wall 25a of the lid 25, and dripped into the case 14 from the pouring hole 25b, thereby performing hot water supply (drip). Further, the hot water supplied into the case 14 passes through the coffee powder and the filter 21 to be extracted as coffee liquid, and the coffee liquid flows down from the extraction port 24 of the case 14 and is stored in the cup 4. Then, when all the water in the water storage tank 8 is consumed, the coffee liquid extraction is completed.

According to this embodiment described above, the following effects can be obtained. That is, set switch 3
After digitally displaying an arbitrary value on the digital display 39 by the operation in step 3, the start switch 44 is turned on.
By operating the , the coffee bean grinding motor 19 can be energized and milled for the time corresponding to the displayed value as described above, so the coffee bean milling time can be precisely set for the desired time. can be done. Furthermore, since the mill time can be selected as desired by simply operating the set switch while looking at the numerical value digitally displayed on the digital display 39, the operation is simplified and there is almost no possibility of erroneous operation. Moreover, the display on the digital display 39 is configured so that the value corresponding to the most frequently and commonly used mill time is displayed longer than other values.
The mill time selection operation can be performed more accurately.

It should be noted that the present invention is not limited to the embodiments described above and shown in the drawings, and can of course be widely applied to, for example, a single coffee grinder or a food processor, and may be modified as appropriate without departing from the gist thereof. It can be modified and implemented.

As understood from the above description, according to the present invention, the driving time of a load can be accurately set for a desired time, and the time setting operation can be simplified, and moreover, when setting a specific driving time, Accordingly, it is possible to provide a load driving device that can perform the time setting operation more accurately.

[Brief explanation of drawings]

The drawings relate to one embodiment of the present invention.
The figure is a longitudinal sectional view of the coffee maker, and FIG. 2 is a diagram showing the electrical configuration of the main parts. In the figure, 19 is a motor (load), 33 is a set switch, 39 is a digital display, and 47 is a drive circuit.

Claims (1)

[Claims] 1. In a device that drives a load for an arbitrarily selectable period of time, a digital display is provided in which the displayed value increases or decreases in steps only during the operating period of the set switch, and the final value displayed on this digital display is The present invention is characterized in that a drive circuit is provided to drive the load for a period of time corresponding to the set switch, and when the digital display steps in the displayed numerical value in response to the operation of the set switch, a particular numerical value is displayed longer than others. load driving device.