JP2872868B2 - Coffee mill - Google Patents

Coffee mill

Info

Publication number
JP2872868B2
JP2872868B2 JP28834392A JP28834392A JP2872868B2 JP 2872868 B2 JP2872868 B2 JP 2872868B2 JP 28834392 A JP28834392 A JP 28834392A JP 28834392 A JP28834392 A JP 28834392A JP 2872868 B2 JP2872868 B2 JP 2872868B2
Authority
JP
Japan
Prior art keywords
motor
amount
output
calculating
change
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP28834392A
Other languages
Japanese (ja)
Other versions
JPH06133879A (en
Inventor
美徳 世古口
Original Assignee
シャープ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by シャープ株式会社 filed Critical シャープ株式会社
Priority to JP28834392A priority Critical patent/JP2872868B2/en
Publication of JPH06133879A publication Critical patent/JPH06133879A/en
Application granted granted Critical
Publication of JP2872868B2 publication Critical patent/JP2872868B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coffee mill provided with a motor for rotating a pulverized body for pulverizing coffee beans.

[0002]

2. Description of the Related Art In a coffee mill of this type, for example, applied to a coffee maker, a timer for appropriately setting a time for driving a motor, that is, a mill time, is provided, and a user can set a timer in advance regardless of the amount of coffee beans. The mill is driven by driving the motor for a set predetermined time. In the case of the above, there is a possibility that the mill is excessively milled or, conversely, the mill is insufficient, which has a disadvantage that the taste of coffee is adversely affected. In order to eliminate such drawbacks, focusing on the fact that the current flowing through the motor changes according to the amount of coffee beans, so that the motor stops after driving the motor for an optimal time according to the amount of coffee beans, A device that detects the current and controls the motor to stop is considered.

[0003] In the above-mentioned configuration, after detecting the current flowing through the motor, judging that the detected output has become equal to or less than a set value, the motor is driven for a predetermined period of time, and then the motor is stopped. ing. In this case, since the motor is driven for a certain period of time after determining the detection output, there is a problem that the milling time cannot be finely controlled according to the amount of coffee beans, and the change in the current flowing through the motor is activated. Since there is no significant difference in the amount of coffee beans except for the time, even if it is determined that the detection output is equal to or less than the set value, it is not accurately determined, that is, optimal control is performed. I could not say it.

Accordingly, a coffee mill capable of driving a motor at an optimum time according to the amount of coffee beans has been invented and disclosed in Japanese Patent Application Laid-Open No. 2-147035. The coffee mill includes a pulse conversion unit that outputs a pulse having a pulse width that is inversely proportional to a detection output from a current detection unit that detects a current flowing through a motor every predetermined time, and an integration unit that integrates a pulse from the pulse conversion unit. And comparing the integrated output from the integrating means with a preset reference value to detect the end of the milling of the coffee beans and perform the stop control of the motor.

Japanese Patent Application Laid-Open No. 3-193012 discloses an invention in which lock of a motor is detected to prevent burnout of the motor. In the lock detection of the motor according to the present invention, the current flowing through the motor is detected and the rectified current value is compared with a reference current value. If the current value flowing through the motor is equal to or more than the reference current value, it is determined that the motor is in a locked state. To detect motor lock.

[0006]

In the above-mentioned conventional coffee mill, the detection of the end of the coffee beans, the detection of the lock of the mill motor, and the detection of the no-load are performed by comparing a current value flowing through the motor with a reference value. However, since there are variations in the type of beans, the hardness of the beans, the power supply voltage, and the like, there is a risk of erroneous detection in control comparing with a predetermined reference value.

[0007]

In order to solve the above-mentioned problems, a coffee mill according to the present invention comprises a motor for rotationally driving a pulverized body for pulverizing coffee beans, current detecting means for detecting a current flowing through the motor, Storage means for storing the detection output from the current detection means at predetermined time intervals; calculation means for calculating the amount of change between the previous detection output and the current detection output stored in the storage means; A second comparing means for comparing the calculated change amount after the start-up period of the motor with a second predetermined amount, and a change amount in a process in which the coffee current is reduced by substantially grinding the coffee beans. Is the second
Counting means for detecting that the output of being equal to or more than a predetermined amount is continuously output from the second comparing means for a predetermined number of times;
The coffee beans are almost ground based on the output of this counting means .
And control means for performing stop control of the motor.

The counting means is not limited to the counter disclosed in the embodiment, but also includes a time counting means for counting a time of (the predetermined time × the predetermined number of times).
Also, the current detection means is not limited to those disclosed in the embodiments,
Japanese Unexamined Patent Publication Nos. 2-147035 and 3-19301
Needless to say, a current transformer disclosed in No. 2 may be used.

As a development of the coffee mill, a motor for rotating a pulverized body for pulverizing coffee beans, current detecting means for detecting a current flowing through the motor, and a detection output from the current detecting means are provided in a predetermined manner. Storage means for storing for each time; calculating means for calculating the amount of change between the previous detection output and current detection output stored in the storage means; and after the elapse of the motor inrush period calculated by the calculation means. A second comparing means for comparing the amount of change at the second predetermined amount with a second predetermined amount, when the amount of change during the process of substantially grinding the coffee beans and decreasing the motor current is equal to or more than the second predetermined amount. Counting means for detecting that the output of the second comparing means has been output a predetermined number of times in succession, and operating based on the output of the counting means to determine the maximum value and the minimum value of the detection output in a predetermined time. Holding hands holding If, by calculating the difference between the maximum value and the minimum value, the mill ends if the difference is less than a predetermined value
And stop control means for stopping said motor comprises coffee As coffee boiling and instrument according to claim 2 of the present invention is arranged between the said flow of water passage and Kiyuro, said hot water reservoir tank bottom a wall with a gap hanging from the body cover provided between and is characterized in that a said vapor outlet in flow water path side and Kiyu roadside of the wall.

A motor for rotating a pulverized body for pulverizing coffee beans, and a current detecting means for detecting a current flowing through the motor, wherein the coffee mill of the present invention is diverted to perform motor stop control under no load. Storage means for storing a detection output from the current detection means at predetermined time intervals;
Calculating means for calculating the amount of change between the previous detection output and the current detection output stored in the storage means; and calculating the amount of change after the elapse of the motor inrush period calculated by the calculating means, and A second comparing means for comparing the amount of change with a fixed amount, and a maximum value and a minimum value of a detection output at a predetermined time which are operated based on the output of the second comparing means that the amount of change is equal to or less than a second predetermined amount. Holding means for holding a value, and calculating a difference between the maximum value and the minimum value, and if the difference is equal to or less than a predetermined value, no negative
Stop control means for stopping the motor as a load operation .

[0011] Further, a motor for rotating a pulverized body for pulverizing coffee beans and a current detecting means for detecting a current flowing through the motor are provided. Storage means for storing the detection output from the current detection means at predetermined time intervals; calculation means for calculating the amount of change between the previous detection output and the current detection output stored in the storage means; A first comparing means for comparing the amount of change calculated in the above with the first predetermined amount; and a motor lock if the amount of change is equal to or more than the first predetermined amount and the current detection output is equal to or more than the predetermined output.
And control means for performing stop control of the motor.

[0012]

The change in the current flowing through the motor does not cause a very large difference in the amount of coffee beans except at the time of starting, and the change in the same tendency occurs depending on the degree of milling of the coffee beans. A state in which the amount of change in current flowing through the motor per predetermined time after the elapse of the startup rush period is detected, and the amount of change in the process in which coffee beans are substantially crushed and the motor current decreases is equal to or greater than a second predetermined amount. Is determined that the coffee beans have been substantially crushed when has continued for a predetermined time,
After this determination, the motor is driven for a certain period of time to stop the motor, or if the difference between the maximum value and the minimum value of the motor current per predetermined time is equal to or less than a predetermined value, the mill is terminated and the motor is stopped.

If the amount of the current change is equal to or less than the second predetermined amount and the difference between the maximum value and the minimum value of the motor current per predetermined time is equal to or less than the predetermined value, the motor is stopped as a no-load operation.

Further, if the amount of change in the current flowing through the motor per predetermined time after the motor is energized is equal to or more than the first predetermined amount and the detected output of the motor current is equal to or more than the predetermined output, the motor is stopped as a motor lock. That is, since the state detection according to the present invention is performed based on a change in current (relative change) per predetermined time flowing through the motor, there is no possibility of erroneous detection due to a change in the type or hardness of the beans or the power supply voltage.

[0015]

An embodiment of the present invention will be described below with reference to the accompanying drawings. First, FIG. 1 shows an embodiment of an electric circuit employed in a coffee mill of the present invention. Reference numeral 1 denotes a DC motor for rotationally driving a pulverized body for pulverizing coffee beans. A diode bridge and an electrolytic capacitor, 4 is a triac for controlling energization of the diode bridge 2, 5 is a resistor for detecting a current flowing through the motor 1, 6, 7, and 8 are resistors of the resistor 1 based on a current flowing through the motor 1. A resistor, a diode, and a resistor for rectifying and dividing the voltage drop generated at both ends, 9 is a smoothing capacitor,
Reference numeral 10 denotes a microcomputer that controls the entire coffee mill,
Both terminals of the smoothing capacitor 9 are connected to a V REf (V D ) terminal also serving as an operation power supply terminal and an IN terminal, and a gate terminal of the triac 4 is connected to an OUT terminal. Then, the resistor 5, resistor 6, diode 7, resistor 8, smoothing capacitor 9
Constitutes the current detecting means 11 according to the present invention.

As shown in the block diagram of FIG. 2, the microcomputer 10 includes a detection voltage storage means 12 for storing the voltage input to the IN terminal at predetermined time intervals (for example, one second) for two times, the previous time and the current time. A calculating means 13 for subtracting the previous voltage value from the current voltage value stored in the storing means 12 to obtain a change amount; and a first and second storing means for storing the change amount obtained by the calculating means 13 in the ROM. First and second comparing means 14 and 15 for comparing with a predetermined amount, determining means 16 for determining whether the amount of change is increasing or decreasing, and counting means 17 for counting the number of times the increasing change of a predetermined amount or more continues. Receiving the output of the counting means 17, the maximum voltage value V MAX for a predetermined time (for example, 5 seconds).
Compared with the holding means 18 for storing and holding the minimum voltage value V MIN, the calculating means 13 for subtracting the minimum voltage value V MIN from the maximum voltage value V MAX, the predetermined value stored subtracted value (difference) in the ROM A third comparing means 19, and a control means 2 for outputting a signal for stopping the motor 1 to the triac 4 based on an output of the third comparing means 19 that the subtraction value is equal to or less than a predetermined value.
0 is built in. Further, a fourth comparing means 21 for comparing the detected voltage this time with a predetermined voltage VL to detect the locked state of the motor 1 and a time measuring means 22 for measuring the energizing time to the motor 1 are incorporated. .

Next, the stop control of the motor according to the present invention will be described with reference to the flowcharts of FIGS. 1, 2 and 3 and the change over time of the detected voltage shown in FIG. O of microcomputer 10
At the same time that the motor ON signal is output from the UT terminal, the time counting means 21 starts (S1), and the voltage value Vn, which is the detection output of the current detection means 11, is read from the IN terminal at predetermined time intervals and sequentially stored in the storage means 12. (S2). And calculating a change amount (Vn-Vn -1) with respect to the voltage value Vn -1 was previously stored by the computing means 13 (S3).

Then, the first comparing means 14 compares whether the calculated change amount is equal to or less than a first predetermined amount (a change amount for motor lock detection which is obtained in advance by experiment and stored in the ROM). (S4). If the amount of change is equal to or less than the first predetermined amount inrush period T 1 (several seconds) of the motor start up has elapsed, repeatedly executes a routine program of the step (S2) ~ (S4). That is, since the change in the detection voltage during the motor start entry period T 1 (several seconds) temporarily drops and rises, it is not used for detection other than the motor lock detection described later.

If the change amount exceeds the first predetermined amount by the first comparing means 14, the voltage value Vn becomes the predetermined voltage V
L (motor lock detection voltage value previously obtained by experiment and stored in ROM) is compared by a fourth comparing means 21 (S5), and as shown in FIG. If it is less than L , it is determined that the lock state is due to bean jam or the like, and the control unit 20 sends an O to the triac 4.
At the same time as outputting the FF signal to stop the motor (S6), the user is informed of the locked state by a display means (not shown). If the voltage is equal to or higher than the predetermined voltage V L , the process returns to the normal routine program.

[0020] Next, it is determined whether the motor start inrush period T 1 is elapsed (S7), the amount of change and inrush period T 1 is passed is determined by the second predetermined amount (advance experimentally RO
The second comparing means 15 compares whether or not it is equal to or more than the mill end detection change amount stored in M (S8).
If the amount of change is equal to or greater than the second predetermined amount, the determining means 16 determines whether the change increases or decreases (S9). If the change increases, the counting means 17 increments the count (S10), and number to reach (previously experimentation by where which had been stored in the ROM seeking, reference number for measuring linear increase duration T 2 appearing before regardless mill ends on the amount of beans) (S11), coffee It is detected that the beans are in a substantially crushed state. Since this detection is performed based on the relative change, the detection immediately before the end of the mill is accurately performed regardless of the type and hardness of the beans and fluctuations in the power supply voltage.

After this state, the end of the mill may be controlled by driving the motor for a predetermined time determined by an experiment. However, if the motor is further driven after reaching this state, the motor shown in FIG.
As shown in the figure, there is almost no change in the voltage value Vn. Therefore, another invention is to store and hold the maximum voltage value V MAX and the minimum voltage value V MIN for a predetermined time T 3 (5 seconds in this embodiment) after the count value reaches a predetermined number in the holding means 18. (S12), the difference between the maximum voltage value V MAX and the minimum voltage value V MIN is calculated by the calculation means 13, and the difference is determined by a predetermined value (a variation for mill end detection which is obtained in advance by experiment and stored in ROM). The third comparing means 19 compares whether the value is equal to or less than the width value (S14). If the value is equal to or less than the predetermined value, it is determined that the mill operation has been completed, and the control means 20 sends an OF signal to the triac 4.
At the same time as outputting the F signal to stop the motor (S6), the user is notified of the end of the mill. If the value is equal to or more than the predetermined value, the process returns to the routine program to repeatedly detect the end of mill.

If the change in the comparison in step 8 (S8) is equal to or less than the second predetermined amount, step 12 (S8)
12), proceed to step 13 (S13) to detect a state in which no coffee beans are in the mill, that is, a no-load state, and if the difference is equal to or less than a predetermined value in the step 13 (S13), a no-load state Then, the control unit 20 outputs an OFF signal to the triac 4 to stop the motor (S6), and at the same time notifies the user that there is no load. If it is equal to or more than the predetermined value, the process returns to the routine program. FIG. 4C is a diagram showing a change over time of the detection voltage in the no-load state.

[0023]

According to the present invention as described above, claim 1
The invention according to claim 2 is based on the type and hardness of the coffee beans.
Or mill end detection is correct regardless of fluctuations in the power supply voltage, etc.
It is possible to carry out the mill accurately and to finish the mill accurately
In addition, the invention according to claim 3 can be applied to the case where the power supply voltage fluctuates.
Despite the fact that there are no coffee beans in the mill,
In other words, no load condition can be detected accurately and
It is possible to reliably prevent wasteful power consumption due to load operation.
And the invention according to claim 4 is based on the type and hardness of the beans.
Or bean jam due to fluctuations in power supply voltage, etc.
The motor lock state can be detected accurately and the motor
Obstacles and unnecessary time consumption can be reliably prevented .

[Brief description of the drawings]

FIG. 1 is an electric circuit diagram employed in a coffee mill of the present invention.

FIG. 2 is a block diagram illustrating a driving control of a coffee mill motor according to the present invention.

FIG. 3 is a flowchart for explaining drive control of a coffee mill motor according to the present invention.

FIG. 4 is a diagram for illustrating drive control of a coffee mill motor according to the present invention, showing a change over time of a detection voltage according to a state in the mill.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 DC motor 5 Resistance (for current detection) 10 Microcomputer 11 Current detection means 12 Storage means 13 Calculation means 14 First comparison means 15 Second comparison means 17 Counting means 18 Holding means 19 Third comparison means 20 Control means 21 Fourth comparison means

Claims (4)

(57) [Claims]
1. A motor for rotationally driving a pulverized body for pulverizing coffee beans, current detection means for detecting a current flowing through the motor, and storage means for storing a detection output from the current detection means at predetermined time intervals. Calculating means for calculating the amount of change between the previous detection output and the current detection output stored in the storage means; and calculating the amount of change after the elapse of the motor inrush period calculated by the calculating means. A second comparing means for comparing with a predetermined amount, and an output indicating that the amount of change in the process of substantially grinding the coffee beans and decreasing the motor current is equal to or more than a second predetermined amount, and Counting means for detecting that the coffee beans are output continuously for a predetermined number of times , and determining that the coffee beans have been substantially ground based on the output of the counting means.
And a control means for performing stop control of the motor.
2. A motor for rotationally driving a pulverized body for pulverizing coffee beans, current detection means for detecting a current flowing through the motor, and storage means for storing a detection output from the current detection means at predetermined time intervals. Calculating means for calculating the amount of change between the previous detection output and the current detection output stored in the storage means; and calculating the amount of change after the elapse of the motor inrush period calculated by the calculating means. A second comparing means for comparing with a predetermined amount, and an output indicating that the amount of change in the process of substantially grinding the coffee beans and decreasing the motor current is equal to or more than a second predetermined amount, and Counting means for detecting that a predetermined number of times has been continuously output from the means; holding means which operates based on the output of the counting means and holds the maximum value and the minimum value of the detection output for a predetermined time; Calculate the difference between the value and the minimum value, Mi if the difference is less than a predetermined value
And a stop control means for stopping the motor at the end of the mill.
3. A motor for rotationally driving a pulverized body for pulverizing coffee beans, current detection means for detecting a current flowing through the motor, and storage means for storing a detection output from the current detection means at predetermined time intervals. Calculating means for calculating the amount of change between the previous detection output and the current detection output stored in the storage means; and calculating the amount of change after the elapse of the motor inrush period calculated by the calculating means. A second comparing means for comparing with a predetermined amount, and a maximum value of a detection output at a predetermined time which operates based on an output of the second comparing means that the change amount is equal to or less than a second predetermined amount. Holding means for holding a minimum value, and stop control means for calculating a difference between the maximum value and the minimum value and stopping the motor as a no-load operation if the difference is equal to or less than a predetermined value. Coffee mill.
4. A motor for rotationally driving a pulverized body for pulverizing coffee beans, current detection means for detecting a current flowing through the motor, and storage means for storing a detection output from the current detection means at predetermined time intervals. Calculating means for calculating the amount of change between the previous detection output and the present detection output stored in the storage means, and a first comparison for comparing the amount of change calculated by the calculating means with a first predetermined amount. Means, and the amount of change is the first
And a control means for performing stop control of the motor as a motor lock if the current detected output is equal to or more than a predetermined amount and the current detected output is equal to or more than the predetermined output.
JP28834392A 1992-10-27 1992-10-27 Coffee mill Expired - Fee Related JP2872868B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP28834392A JP2872868B2 (en) 1992-10-27 1992-10-27 Coffee mill

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP28834392A JP2872868B2 (en) 1992-10-27 1992-10-27 Coffee mill

Publications (2)

Publication Number Publication Date
JPH06133879A JPH06133879A (en) 1994-05-17
JP2872868B2 true JP2872868B2 (en) 1999-03-24

Family

ID=17728978

Family Applications (1)

Application Number Title Priority Date Filing Date
JP28834392A Expired - Fee Related JP2872868B2 (en) 1992-10-27 1992-10-27 Coffee mill

Country Status (1)

Country Link
JP (1) JP2872868B2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2920288B1 (en) * 2007-08-29 2009-10-23 Seb Sa Method for counting the number of turns of a wheel of a coffee mill and apparatus comprising such a mill
CN103082866B (en) * 2013-01-29 2015-08-12 苏州工业园区咖乐美电器有限公司 A kind of full-automatic coffee machine and self-locking power supply thereof
US9675211B2 (en) 2015-03-06 2017-06-13 Helen Of Troy Limited No-bean detection for coffee bean grinder

Also Published As

Publication number Publication date
JPH06133879A (en) 1994-05-17

Similar Documents

Publication Publication Date Title
AU2004203220B2 (en) DC Power Source Unit with Battery Charging Function
US4621313A (en) Soft-start capacitor discharge circuit
US6822409B2 (en) Circuit using current limiting to reduce power consumption of actuator with DC brush motor
US6715996B2 (en) Method for the operation of a centrifugal pump
US5010287A (en) Induction motor control system
KR0167648B1 (en) Power supply device
US6534940B2 (en) Marine macerator pump control module
JP2648575B2 (en) Operation control device for air conditioner and control method therefor
US5545012A (en) Soft-start pump control system
EP0752125B1 (en) Two terminal line voltage thermostat
US6127789A (en) Apparatus for controlling the lighting of a discharge lamp by controlling the input power of the lamp
DE4124240C2 (en) Process for controlling the motor current of a brushless DC motor
US4985632A (en) Suntan indicator
CA2528269C (en) Electric tightening device
US6243626B1 (en) External power management device with current monitoring precluding shutdown during high current
US5198743A (en) Battery charger with microprocessor control
KR970011059B1 (en) Battery - powered device
US5941690A (en) Constant pressure variable speed inverter control booster pump system
KR100286882B1 (en) Battery Charging System with Algebraic Analog Digital Converter to Automatically Convert Analog Signals
US4866590A (en) Supply having a load invariant auxiliary power supply supplied from a main transformer and a current suppressing inductor
JP3430264B2 (en) Charging device
KR100658242B1 (en) Inverter device
EP0077118B1 (en) Motor power factor controller with a reduced voltage starter
US4845607A (en) Dual input voltage power source for selectively switching between voltage doubler rectification and full-wave rectification functions
EP1424758B1 (en) Universal battery charger

Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees