JPH06133879A - Coffee mill - Google Patents
Coffee millInfo
- Publication number
- JPH06133879A JPH06133879A JP28834392A JP28834392A JPH06133879A JP H06133879 A JPH06133879 A JP H06133879A JP 28834392 A JP28834392 A JP 28834392A JP 28834392 A JP28834392 A JP 28834392A JP H06133879 A JPH06133879 A JP H06133879A
- Authority
- JP
- Japan
- Prior art keywords
- motor
- amount
- output
- change
- predetermined
- 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.)
- Granted
Links
Landscapes
- Apparatus For Making Beverages (AREA)
Abstract
(57)【要約】
【目的】 本発明は、豆の種類や豆の硬さあるいは電源
電圧の変動等に拘らず、ミル終了検知，無負荷検知，モ
ータロック検知を適確に行うことができるコーヒーミル
を提供することにある。
【構成】 コーヒー豆を粉砕する粉砕体を回転駆動する
モータ１に流れる電流を検出する電流検出手段１１と、
検出出力を所定時間毎に記憶する記憶手段１２と、前回
の検出出力と今回の検出出力との変化量を演算する演算
手段１３と、モータ１の起動突入期間経過後に於ける変
化量と所定量とを比較する比較手段１５と、コーヒー豆
が略粉砕してモータ電流が減少してゆく過程での変化量
が所定量以上であるとの出力が比較手段１５から所定回
数連続して出されたことを検出する計数手段１７と、こ
の計数手段１５の出力に基づいて前記モータを停止させ
る制御手段２０とを具備する。
(57) [Abstract] [Purpose] The present invention can accurately perform mill end detection, no-load detection, and motor lock detection regardless of the type of beans, hardness of beans, fluctuation of power supply voltage, and the like. To provide a coffee mill. [Structure] Current detecting means 11 for detecting a current flowing through a motor 1 for rotationally driving a crushed body for crushing coffee beans
A storage unit 12 that stores the detection output at predetermined time intervals, a calculation unit 13 that calculates the amount of change between the previous detection output and the present detection output, and a change amount and a predetermined amount after the start-up period of the motor 1 has elapsed. The comparison means 15 for comparing the above and the comparison means 15 continuously output the output that the amount of change in the process in which the coffee beans are substantially crushed and the motor current is decreased to be a predetermined amount or more. It is provided with a counting means 17 for detecting this, and a control means 20 for stopping the motor based on the output of the counting means 15.
Description
【０００１】[0001]
【産業上の利用分野】本発明は、コーヒー豆を粉砕する
粉砕体を回転駆動するモータを備えてなるコーヒーミル
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coffee mill having a motor for rotating a crushing body for crushing coffee beans.
【０００２】[0002]
【従来の技術】この種のコーヒーミルである例えばコー
ヒーメーカーに適用されたものにおいては、モータを駆
動する時間つまりミル時間を適宜設定するタイマを設
け、使用者がコーヒー豆の量に関係なく予め設定された
所定の時間モータを駆動してミルを行うようにしてい
る。上記のものの場合、ミルし過ぎたり、逆にミル不足
となったりするおそれがあり、コーヒーの味に悪影響を
与える欠点があった。このような欠点を解消するため
に、コーヒー豆の量に応じてモータを最適な時間だけ駆
動した後停止するように、モータに流れる電流がコーヒ
ー豆の量に応じて変化することに着目し、該電流を検出
してモータを停止するように制御するものが考えられて
いる。2. Description of the Related Art In this type of coffee mill, which is applied to, for example, a coffee maker, a timer for appropriately setting a time for driving a motor, that is, a mill time is provided so that a user can set the time 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-mentioned thing, there is a possibility that it may be over-milled or, conversely, it may be insufficient, and there is a drawback that the taste of coffee is adversely affected. In order to eliminate such a drawback, paying attention to the fact that the current flowing through the motor changes according to the amount of coffee beans so that the motor is driven for an optimum time according to the amount of coffee beans and then stopped. It is considered to detect the current and control the motor so as to stop it.
【０００３】上記構成のものは、モータに流れる電流を
検出し、その検出出力が設定値以下になったことを判断
した後、更に決められた一定時間駆動してから、モータ
を停止するようにしている。このものの場合、検出出力
を判断した後更に一定時間モータを駆動するので、コー
ヒー豆の量に応じてミル時間をきめ細かく制御すること
ができないという問題があり、又、モータに流れる電流
の変化は起動時を除いてコーヒー豆の量に対してあまり
大きな差が生じるものではないため、上記検出出力が設
定値以下になることで判断しても、正確な判断即ち最適
な制御をしているとは言えなかった。In the above-mentioned structure, the current flowing through the motor is detected, and after it is judged that the detected output has become equal to or less than the set value, the motor is further driven for a fixed time and then the motor is stopped. ing. In this case, since the motor is driven for a certain period of time after the detection output is judged, there is a problem that the milling time cannot be finely controlled according to the amount of coffee beans. There is no big difference to the amount of coffee beans except time, so even if it is judged that the above detection output is below the set value, it is said that accurate judgment, that is, optimum control is performed. I could not say.
【０００４】そこで、コーヒー豆の量に応じた最適時間
でモータを駆動することができるコーヒーミルが発明さ
れ特開平２−１４７０３５号に開示されている。そのコ
ーヒーミルは、モータに流れる電流を検出する電流検出
手段からの検出出力に反比例するパルス幅のパルスを所
定時間毎に出力するパルス変換手段と、このパルス変換
手段からのパルスを積分する積分手段とを備え、この積
分手段からの積分出力と予め設定された基準値とを比較
してコーヒー豆のミル終了を検知し前記モータの停止制
御を行うものである。Therefore, a coffee mill capable of driving a motor in an optimum time according to the amount of coffee beans was invented and disclosed in Japanese Patent Laid-Open No. 147035/1990. The coffee mill has a pulse converting means for outputting a pulse having a pulse width inversely proportional to a detection output from a current detecting means for detecting a current flowing through a motor at predetermined time intervals, and an integrating means for integrating the pulse from the pulse converting means. Comparing the integrated output from the integrator with a preset reference value, the end of the coffee bean mill is detected and the motor stop control is performed.
【０００５】又、モータのロックを検知してモータの焼
損を未然に防ぐ発明が特開平３−１９３０１２号に開示
されている。この発明に於けるモータのロック検知はモ
ータに流れる電流を検出し整流した電流値を基準電流値
と比較して、モータに流れる電流値が基準電流値以上で
あればロック状態であると判断してモータのロック検知
をおこなっている。Further, Japanese Patent Laid-Open No. 193012/1993 discloses an invention which detects a motor lock to prevent the motor from being burned. In the motor lock detection according to the present invention, the current flowing in the motor is detected, the rectified current value is compared with the reference current value, and if the current value flowing in the motor is equal to or greater than the reference current value, it is determined that the motor is in the locked state. The motor lock is detected.
【０００６】[0006]
【発明が解決しようとする課題】上記従来技術のコーヒ
ーミルは、コーヒー豆のミル終了検知，ミルモータのロ
ック検知および無負荷検知を、モータに流れる電流値と
基準値とを比較することにより行っているが、豆の種類
や豆の硬さ，電源電圧等のバラツキがあるため所定の基
準値と比較する制御では誤検知の虞れがあった。In the above-mentioned conventional coffee mill, the detection of the end of coffee beans, the lock detection of the mill motor, and the no-load detection are performed by comparing the current value flowing through the motor with a reference value. However, since there are variations in the type of beans, the hardness of beans, the power supply voltage, etc., there is a risk of erroneous detection in the control comparing with a predetermined reference value.
【０００７】[0007]
【課題を解決するための手段】上記課題を解決するため
に本発明のコーヒーミルは、コーヒー豆を粉砕する粉砕
体を回転駆動するモータと、このモータに流れる電流を
検出する電流検出手段と、この電流検出手段からの検出
出力を所定時間毎に記憶する記憶手段と、この記憶手段
に記憶した前回の検出出力と今回の検出出力との変化量
を演算する演算手段と、この演算手段にて演算した前記
モータの起動突入期間経過後に於ける変化量と第２の所
定量とを比較する第２の比較手段と、コーヒー豆が略粉
砕してモータ電流が減少してゆく過程での変化量が第２
の所定量以上であるとの出力が前記第２の比較手段から
所定回数連続して出されたことを検出する計数手段と、
この計数手段の出力に基づいて前記モータの停止制御を
行う制御手段とを具備する。In order to solve the above problems, a coffee mill of the present invention comprises a motor for rotationally driving a crushed body for crushing coffee beans, and a current detecting means for detecting a current flowing through the motor. A storage unit that stores the detection output from the current detection unit at predetermined time intervals, a calculation unit that calculates the amount of change between the previous detection output and the current detection output stored in the storage unit, and the calculation unit. Second comparing means for comparing the calculated change amount after the start-up rush period of the motor with the second predetermined amount, and the change amount in the process in which coffee beans are substantially crushed and the motor current decreases. Is the second
A counting means for detecting that the second comparing means continuously outputs a predetermined number or more of the output,
And a control means for controlling the stop of the motor based on the output of the counting means.
【０００８】前記計数手段とは実施例にて開示するカウ
ンターに限定されるものではなく、（前記所定時間×前
記所定回数）の時間を計時する計時手段をも含む。
又、電流検出手段も実施例に開示のものに限定されず、
前記特開平２−１４７０３５号，特開平３−１９３０１
２号にて開示されたカレントトランスを用いるものであ
っても良いこと勿論である。The counting means is not limited to the counter disclosed in the embodiment, but includes a counting means for measuring a time of (the predetermined time × the predetermined number of times).
Further, the current detection means is not limited to the one disclosed in the embodiment,
JP-A-2-147035 and JP-A-3-19301
Of course, the current transformer disclosed in No. 2 may be used.
【０００９】上記本発明のコーヒーミルを発展させたも
のとして、コーヒー豆を粉砕する粉砕体を回転駆動する
モータと、このモータに流れる電流を検出する電流検出
手段と、この電流検出手段からの検出出力を所定時間毎
に記憶する記憶手段と、この記憶手段に記憶した前回の
検出出力と今回の検出出力との変化量を演算する演算手
段と、この演算手段にて演算した前記モータの起動突入
期間経過後に於ける変化量と第２の所定量とを比較する
第２の比較手段と、コーヒー豆が略粉砕してモータ電流
が減少してゆく過程での変化量が第２の所定量以上であ
るとの出力が前記第２の比較手段から所定回数連続して
出されたことを検出する計数手段と、この計数手段の出
力に基づいて作動し所定時間に於ける検出出力の最大値
と最小値を保持する保持手段と、その最大値と最小値と
の差を演算し、その差が所定値以下であるならば前記モ
ータを停止させる停止制御手段とを具備する。As a development of the coffee mill of the present invention, a motor for rotationally driving a crushing body for crushing coffee beans, a current detecting means for detecting a current flowing through the motor, and a detection from the current detecting means. A storage means for storing the output at every predetermined time, a calculation means for calculating the amount of change between the previous detection output and the current detection output stored in the storage means, and a starting rush of the motor calculated by the calculation means. The second comparing means for comparing the amount of change after the lapse of the period with the second predetermined amount, and the amount of change in the process in which the coffee current is substantially crushed and the motor current decreases more than the second predetermined amount. And a counting means for detecting that the second comparison means continuously outputs a predetermined number of times, and a maximum value of the detection output in a predetermined time which operates based on the output of the counting means. Keep the minimum value A holding unit, it calculates the difference between the maximum value and the minimum value, the difference is and a stop control means for stopping the motor if it is less than a predetermined value.
【００１０】上記本発明のコーヒーミルを流用して無負
荷時のモータ停止制御を行うものとして、コーヒー豆を
粉砕する粉砕体を回転駆動するモータと、このモータに
流れる電流を検出する電流検出手段と、この電流検出手
段からの検出出力を所定時間毎に記憶する記憶手段と、
この記憶手段に記憶した前回の検出出力と今回の検出出
力との変化量を演算する演算手段と、この演算手段にて
演算した前記モータの起動突入期間経過後に於ける変化
量と第２の所定量とを比較する第２の比較手段と、変化
量が第２の所定量以下であるとの前記比較手段の出力に
基づいて作動し所定時間に於ける検出出力の最大値と最
小値を保持する保持手段と、その最大値と最小値との差
を演算し、その差が所定値以下であるならば前記モータ
を停止させる停止制御手段とを具備する。A motor for rotatably driving a crushing body for crushing coffee beans and a current detecting means for detecting a current flowing through this motor are used as a control for stopping the motor under no load by diverting the coffee mill of the present invention. And storage means for storing the detection output from the current detection means at predetermined time intervals,
A calculation means for calculating a change amount between the previous detection output and the current detection output stored in the storage means, and a change amount after the start-up rush period of the motor calculated by the calculation means and the second place. It operates based on the output of the second comparing means for comparing the fixed amount and the comparing means that the amount of change is less than or equal to the second predetermined amount, and holds the maximum value and the minimum value of the detection output in the predetermined time. And a stop control means for calculating the difference between the maximum value and the minimum value and stopping the motor if the difference is less than or equal to a predetermined value.
【００１１】更に上記発明のコーヒーミルを流用してモ
ータロック時のモータ停止制御を行うものとして、コー
ヒー豆を粉砕する粉砕体を回転駆動するモータと、この
モータに流れる電流を検出する電流検出手段と、この電
流検出手段からの検出出力を所定時間毎に記憶する記憶
手段と、この記憶手段に記憶した前回の検出出力と今回
の検出出力との変化量を演算する演算手段と、この演算
手段にて演算した変化量と第１の所定量とを比較する第
１の比較手段と、変化量が前記第１の所定量以上であっ
て今回の検出出力が所定出力以上ならば前記モータの停
止制御を行う制御手段とを具備する。Further, the coffee mill according to the present invention is diverted to perform motor stop control when the motor is locked, and a motor for rotationally driving a crushing body for crushing coffee beans and a current detecting means for detecting a current flowing through this motor. And a storage means for storing the detection output from the current detection means at predetermined time intervals, a calculation means for calculating the amount of change between the previous detection output and the current detection output stored in the storage means, and the calculation means. The first comparing means for comparing the change amount calculated in step 1 with the first predetermined amount; and if the change amount is equal to or more than the first predetermined amount and the detected output this time is equal to or more than the predetermined output, stop the motor. And a control means for controlling.
【００１２】[0012]
【作用】モータに流れる電流の変化は起動時を除いてコ
ーヒー豆の量に対してはあまり大きな差が生じるもので
はなくて、コーヒー豆のミル度合によって同一傾向の変
化が生じるという事情に基づいて、起動突入期間経過後
のモータに流れる所定時間あたりの電流変化量を検出
し、コーヒー豆が略粉砕してモータ電流が減少してゆく
過程での変化量が第２の所定量以上である状態が所定時
間続いたときコーヒー豆が略粉砕したとの判定を行い、
この判定後に一定時間モータを駆動してモータを停止さ
せたり、所定時間あたりのモータ電流最大値と最小値と
の差が所定値以下であるならばミル終了としてモータを
停止させる。[Function] The change in the current flowing through the motor does not cause a very large difference with respect to the amount of coffee beans except at the time of start-up, and based on the situation that the same tendency changes depending on the degree of milling of coffee beans. A state in which the amount of change in the current flowing through the motor per a predetermined time after the start-up rush period has been detected and the amount of change in the process in which the coffee current is substantially crushed and the motor current is decreasing is equal to or greater than the second predetermined amount. When it continues for a predetermined time, it is determined that the coffee beans have been crushed,
After this determination, the motor is driven for a fixed 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 less than or equal to the predetermined value, the mill is terminated and the motor is stopped.
【００１３】又、上記電流変化量が第２の所定量以下で
且つ所定時間あたりのモータ電流最大値と最小値との差
が所定値以下であるならば無負荷運転としてモータを停
止させる。If the amount of change in the current is less than or equal to the second predetermined amount and the difference between the maximum value and the minimum value of the motor current per predetermined time is less than or equal to the predetermined value, no-load operation is performed and the motor is stopped.
【００１４】更に、モータ通電後のモータに流れる所定
時間あたりの電流変化量が第１の所定量以上且つモータ
電流の検出出力が所定出力以上であるならばモータロッ
クとしてモータを停止させる。 即ち、本発明による状
態検知はモータに流れる所定時間あたりの電流変化（相
対的変化）に基づいて行われるので、豆の種類や硬さあ
るいは電源電圧の変動等による誤検知の虞れがない。Further, if the amount of change in the current flowing through the motor after the motor is energized per predetermined time is equal to or greater than the first predetermined amount and the detection output of the motor current is equal to or greater than the predetermined output, the motor is locked and the motor is stopped. That is, since the state detection according to the present invention is performed on the basis of the change (relative change) in the current flowing through the motor per predetermined time, there is no risk of erroneous detection due to the type or hardness of beans, fluctuations in power supply voltage, or the like.
【００１５】[0015]
【実施例】以下、本発明の一実施例を添付図面を参照し
ながら説明する。まず図１は本発明のコーヒーミルに採
用された電気回路の一実施例であり、１はコーヒー豆を
粉砕する粉砕体を回転駆動する直流モータ、２と３はモ
ータ１の直流電源を構成するダイオードブリッジと電解
コンデンサ、４はダイオードブリッジ２への通電制御を
行うためのトライアック、５はモータ１に流れる電流を
検出するための抵抗、６，７，８はモータ１に流れる電
流によって抵抗１の両端に発生する降下電圧を整流し分
割する抵抗，ダイオード，抵抗、９は平滑コンデンサ、
１０はコーヒーミル全体の制御を司るマイコンであり、
動作電源端子兼用のＶREf（ＶD）端子とＩＮ端子とに平
滑コンデンサ９の両端子が、ＯＵＴ端子にトライアック
４のゲート端子が接続されている。そして、上記抵抗
５，抵抗６，ダイオード７，抵抗８，平滑コンデンサ９
にて本発明に係る電流検出手段１１を構成している。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 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 adopted in the coffee mill of the present invention, in which 1 is a DC motor for rotationally driving a crushed body for crushing coffee beans, and 2 and 3 are DC power sources for the motor 1. A diode bridge and an electrolytic capacitor, 4 are triacs for controlling energization to the diode bridge 2, 5 are resistors for detecting a current flowing in the motor 1, 6, 7 and 8 are resistors 1 by a current flowing in the motor 1. A resistor, a diode, and a resistor that rectify and divide the voltage drop that occurs at both ends, 9 is a smoothing capacitor,
10 is a microcomputer that controls the entire coffee mill,
Both terminals of the smoothing capacitor 9 are connected to the V REf (V D ) terminal also serving as the operating power supply terminal and the IN terminal, and the gate terminal of the triac 4 is connected to the 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.
【００１６】上記マイコン１０は図２のブロック構成図
に示す如く、所定時間（例えば１秒）毎にＩＮ端子に入
力される電圧を前回と今回の２回分記憶する検出電圧記
憶手段１２と、該記憶手段１２に記憶された今回の電圧
値から前回の電圧値を減算して変化量を求める演算手段
１３と、該演算手段１３で求めた変化量をＲＯＭに記憶
された第１，第２の所定量と比較する第１，第２の比較
手段１４，１５と、変化量が増加か減少かを判別する判
別手段１６と、所定量以上の増加変化が連続した回数を
計数する計数手段１７と、該計数手段１７の出力を受け
て所定時間（例えば５秒間）に於ける最大電圧値ＶMAX
と最小電圧値ＶMINを記憶保持する保持手段１８と、最
大電圧値ＶMAXから最小電圧値ＶMINを減算する演算手段
１３と、減算値（差）をＲＯＭに記憶された所定値と比
較する第３の比較手段１９と、減算値が所定値以下であ
るとの第３の比較手段１９の出力に基づいてモータ１を
停止させる信号をトライアック４に出力する制御手段２
０とを内蔵している。又、モータ１のロック状態を検知
するために今回の検出電圧を所定電圧ＶLと比較する第
４の比較手段２１と、モータ１への通電時間を計時する
計時手段２２等を内蔵している。As shown in the block diagram of FIG. 2, the microcomputer 10 has a detection voltage storage means 12 for storing the voltage input to the IN terminal every predetermined time (for example, 1 second) twice for the previous time and this time, and A calculation unit 13 that obtains a change amount by subtracting the previous voltage value from the current voltage value stored in the storage unit 12, and a first and second storage unit that stores the change amount obtained by the calculation unit 13 in the ROM. First and second comparing means 14 and 15 for comparing with a predetermined amount, discriminating means 16 for discriminating whether the amount of change is increasing or decreasing, and counting means 17 for counting the number of times an increasing change of a predetermined amount or more continues. , The maximum voltage value V MAX in a predetermined time (for example, 5 seconds) in response to the output of the counting means 17.
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 The control means 2 for outputting to the triac 4 a signal for stopping the motor 1 based on the outputs of the third comparison means 19 and the third comparison means 19 that the subtraction value is less than or equal to a predetermined value.
It contains 0 and. Further, in order to detect the locked state of the motor 1, a fourth comparing means 21 for comparing the detected voltage at this time with a predetermined voltage VL , a time measuring means 22 for measuring the energization time to the motor 1 and the like are incorporated. .
【００１７】次に、本発明によるモータの停止制御を図
１，図２及び図３のフローチャート，図４に示す検出電
圧の経時変化図に基づいて説明する。マイコン１０のＯ
ＵＴ端子からモータＯＮの信号が出力されると同時に計
時手段２１がスタートし（Ｓ１）、所定時間毎に電流検
出手段１１の検出出力である電圧値ＶｎをＩＮ端子から
読み込み記憶手段１２に順次記憶する（Ｓ２）。そして
演算手段１３にて前回記憶した電圧値Ｖｎ-1に対する変
化量（Ｖｎ−Ｖｎ-1）を演算する（Ｓ３）。Next, the motor stop control according to the present invention will be described with reference to the flowcharts of FIGS. 1, 2 and 3 and the time-dependent change diagram of the detected voltage shown in FIG. O of the microcomputer 10
At the same time that the motor ON signal is output from the UT terminal, the timing means 21 is started (S1), and the voltage value Vn which is the detection output of the current detection means 11 is read from the IN terminal and stored in the storage means 12 in sequence at predetermined time intervals. Yes (S2). Then, the calculating means 13 calculates the amount of change (Vn-Vn- 1 ) with respect to the voltage value Vn- 1 stored previously (S3).
【００１８】そして、演算した変化量が第１の所定量
（予め実験により求めてＲＯＭに記憶させてあるところ
のモータロック検出用変化量）以下であるかどうかを第
１の比較手段１４で比較する（Ｓ４）。変化量が第１の
所定量以下であればモータ起動の突入期間Ｔ1（数秒
間）が経過する迄、ステップ（Ｓ２）〜（Ｓ４）のルー
チンプログラムを繰り返し実行する。即ち、このモータ
起動突入期間Ｔ1（数秒間）に於ける検出電圧の変化は
一旦下降して上昇するので後述のモータロック検知以外
の検知には利用しないようにしている。Then, the first comparing means 14 compares whether or not the calculated change amount is less than or equal to a first predetermined amount (a change amount for motor lock detection which is obtained in advance by experiment and stored in the ROM). Yes (S4). If the amount of change is less than or equal to the first predetermined amount, the routine program of steps (S2) to (S4) is repeatedly executed until the rush period T 1 (several seconds) for starting the motor elapses. That is, since the change in the detected voltage during the motor start rush period T 1 (several seconds) once drops and rises, it is not used for detection other than motor lock detection described later.
【００１９】もし、前記第１の比較手段１４にて変化量
が第１の所定量を越えていれば電圧値Ｖｎが所定電圧Ｖ
L（予め実験により求めてＲＯＭに記憶させてあるとこ
ろのモータロック検出用電圧値）以下かどうかを第４の
比較手段２１で比較し（Ｓ５）、図４（ｂ）に示す如く
所定電圧ＶL以下であれば豆詰まり等によるロック状態
であると判断して制御手段２０からトライアック４にＯ
ＦＦ信号を出力してモータを停止させる（Ｓ６）と同時
に使用者にロック状態である旨の報知を表示手段（図示
省略）にて行う。所定電圧ＶL以上であれば正常時のル
ーチンプログラムに戻る。If the amount of change in the first comparing means 14 exceeds the first predetermined amount, the voltage value Vn is the predetermined voltage Vn.
The fourth comparing means 21 makes a comparison (S5) to determine whether or not the value is equal to or less than L (motor lock detection voltage value obtained by experiment in advance and stored in ROM) (S5), and a predetermined voltage V is obtained as shown in FIG. 4B. If it is L or less, it is determined that the lock state is caused by jamming of beans, etc.
At the same time as outputting the FF signal to stop the motor (S6), the user is informed of the locked state by the display means (not shown). If it is equal to or higher than the predetermined voltage V L , the routine program returns to the normal routine.
【００２０】次に、モータ起動突入期間Ｔ1が経過した
かどうかを判定し（Ｓ７）、突入期間Ｔ1が経過すると
前記変化量が第２の所定量（予め実験により求めてＲＯ
Ｍに記憶させてあるところのミル終了検知用変化量）以
上かどうかを第２の比較手段１５で比較する（Ｓ８）。
変化量が第２の所定量以上であれば変化が増加か減少か
を判別手段１６にて判別し（Ｓ９）、増加であれば計数
手段１７をカウントをアップし（Ｓ１０）、カウント値
が所定回数（予め実験により求めてＲＯＭに記憶させて
あるところの、豆の量に拘らずミル終了前に現れる直線
的増加継続時間Ｔ2を測定するための基準回数）に達す
ると（Ｓ１１）、コーヒー豆が略粉砕した状態であるこ
との検知がなされる。この検知は相対的変化に基づいて
行われるので、豆の種類や硬さ及び電源電圧の変動等に
拘らず適確にミル終了直前の検知が行われる。Next, it is judged whether or not the motor starting rush period T 1 has passed (S7), and when the rush period T 1 has passed, the change amount is changed to a second predetermined amount (RO determined by experiments beforehand).
The second comparing means 15 compares whether it is equal to or more than the change amount for mill end detection stored in M) (S8).
If the amount of change is greater than or equal to the second predetermined amount, the determining unit 16 determines whether the change is increasing or decreasing (S9), and if it is increasing, the counting unit 17 counts up (S10) and the count value is predetermined. When the number of times (reference number for measuring the linearly increasing duration T 2 that appears before the end of the mill regardless of the amount of beans, which has been obtained in advance by experiment and stored in ROM) is reached (S11), the 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 can be performed accurately regardless of the type and hardness of the beans and the fluctuation of the power supply voltage.
【００２１】この状態以降は実験により求めた所定時間
モータを駆動してミル終了の制御を行ってもよいが、こ
の状態に達した後さらにモータを駆動すると図４（ａ）
に示す如く、電圧値Ｖｎの変化が殆どなくなる。そこ
で、もう一つの発明はカウント値が所定回数に達した
後、所定時間Ｔ3（本実施例では５秒間）に於ける最大
電圧値ＶMAXと最小電圧値ＶMINを保持手段１８に記憶保
持し（Ｓ１２）、最大電圧値ＶMAXと最小電圧値ＶMINの
差を演算手段１３で演算し、その差を所定値（予め実験
により求めてＲＯＭに記憶させてあるところのミル終了
検知用変動幅値）以下かどうかを第３の比較手段１９で
比較し（Ｓ１４）、所定値以下であればミル動作終了で
あると判断して制御手段２０からトライアック４にＯＦ
Ｆ信号を出力してモータを停止させる（Ｓ６）と同時に
使用者にミル終了の報知を行う。所定値以上であればル
ーチンプログラムに戻り繰り返しミル終了検知を行う。After this state, the motor may be driven for a predetermined period of time determined by experiments to control the end of the mill, but if the motor is further driven after reaching this state, FIG.
As shown in, the change in the voltage value Vn almost disappears. Therefore, in another invention, after the count value reaches a predetermined number of times, the maximum voltage value V MAX and the minimum voltage value V MIN within a predetermined time T 3 (5 seconds in this embodiment) are stored and held in the holding means 18. Then, (S12), the difference between the maximum voltage value V MAX and the minimum voltage value V MIN is calculated by the calculating means 13, and the difference is determined by a predetermined value (a variation for mill end detection, which is previously stored in the ROM and is stored in the ROM). It is judged whether the milling operation is completed or not by the third comparing means 19 (S14), and if it is less than a predetermined value, the control means 20 sends the triac 4 to OF.
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 it is equal to or larger than the predetermined value, the routine is returned to the routine program to repeatedly detect the end of the mill.
【００２２】又、前記ステップ８（Ｓ８）の比較に於い
て変化量が第２の所定量以下であればステップ１２（Ｓ
１２）、ステップ１３（Ｓ１３）に進んでミル内にコー
ヒー豆が入っていない状態すなわち無負荷状態の検知を
行い、ステップ１３（Ｓ１３）に於いて差が所定値以下
であれば、無負荷状態であると判断して制御手段２０か
らトライアック４にＯＦＦ信号を出力してモータを停止
させる（Ｓ６）と同時に使用者に無負荷状態である旨の
報知を行う。所定値以上であればルーチンプログラムに
戻る。尚、図４（ｃ）は無負荷状態に於ける検出電圧の
経時変化を示す図である。If the amount of change is equal to or less than the second predetermined amount in the comparison of step 8 (S8), step 12 (S
12), proceed to step 13 (S13) to detect the state where no coffee beans are in the mill, that is, the unloaded state, and if the difference is less than the predetermined value in step 13 (S13), the unloaded state Then, an OFF signal is output from the control means 20 to the triac 4 to stop the motor (S6), and at the same time, the user is informed that there is no load. If it is equal to or more than the predetermined value, the process returns to the routine program. Incidentally, FIG. 4C is a diagram showing a change with time of the detected voltage in the no-load state.
【００２３】[0023]
【発明の効果】以上のように本発明によれば、モータに
流れる所定時間あたりの電流変化（相対的変化）に基づ
いてミル内の状態検知が行われるので、豆の種類や硬さ
あるいは電源電圧の変動等に拘らず、ミル終了検知，無
負荷検知，モータロック検知，を適確に行うことができ
る。As described above, according to the present invention, since the state in the mill is detected based on the change (relative change) in the current flowing through the motor per predetermined time, the type and hardness of beans or the power supply Mill end detection, no-load detection, and motor lock detection can be performed accurately regardless of voltage fluctuations.
【図１】本発明のコーヒーミルに採用された電気回路図
である。FIG. 1 is an electric circuit diagram adopted in a coffee mill of the present invention.
【図２】本発明によるコーヒーミルモータの駆動制御を
説明するためのブロック構成図である。FIG. 2 is a block configuration diagram for explaining drive control of a coffee mill motor according to the present invention.
【図３】本発明によるコーヒーミルモータの駆動制御を
説明するためのフローチャートである。FIG. 3 is a flowchart for explaining drive control of a coffee mill motor according to the present invention.
【図４】本発明によるコーヒーミルモータの駆動制御を
説明するための、ミル内の状態に応じた検出電圧の経時
変化を示す図である。FIG. 4 is a diagram for explaining the drive control of the coffee mill motor according to the present invention, showing the change over time in the detected voltage according to the state inside the mill.
１ 直流モータ ５ 抵抗（電流検出用） １０ マイコン １１ 電流検出手段 １２ 記憶手段 １３ 演算手段 １４ 第１の比較手段 １５ 第２の比較手段 １７ 計数手段 １８ 保持手段 １９ 第３の比較手段 ２０ 制御手段 ２１ 第４の比較手段 1 DC Motor 5 Resistance (for Current Detection) 10 Microcomputer 11 Current Detection Means 12 Storage Means 13 Computing 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)
するモータと、このモータに流れる電流を検出する電流
検出手段と、この電流検出手段からの検出出力を所定時
間毎に記憶する記憶手段と、この記憶手段に記憶した前
回の検出出力と今回の検出出力との変化量を演算する演
算手段と、この演算手段にて演算した前記モータの起動
突入期間経過後に於ける変化量と第２の所定量とを比較
する第２の比較手段と、コーヒー豆が略粉砕してモータ
電流が減少してゆく過程での変化量が第２の所定量以上
であるとの出力が前記第２の比較手段から所定回数連続
して出されたことを検出する計数手段と、この計数手段
の出力に基づいて前記モータの停止制御を行う制御手段
とを具備してなるコーヒーミル。1. A motor for rotationally driving a crushed body for crushing coffee beans, a current detection means for detecting a current flowing through the motor, and a 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 detected output and the present detected output stored in the storage means, and the amount of change after the start-up rush period of the motor calculated by the calculating means and the second The second comparing means for comparing the predetermined amount with the second comparing means outputs the output that the amount of change in the process of the coffee beans being substantially crushed and the motor current decreasing being equal to or greater than the second predetermined amount. A coffee mill comprising a counting means for detecting that the means has continuously output a predetermined number of times, and a control means for controlling the stop of the motor based on the output of the counting means.
するモータと、このモータに流れる電流を検出する電流
検出手段と、この電流検出手段からの検出出力を所定時
間毎に記憶する記憶手段と、この記憶手段に記憶した前
回の検出出力と今回の検出出力との変化量を演算する演
算手段と、この演算手段にて演算した前記モータの起動
突入期間経過後に於ける変化量と第２の所定量とを比較
する第２の比較手段と、コーヒー豆が略粉砕してモータ
電流が減少してゆく過程での変化量が第２の所定量以上
であるとの出力が前記第２の比較手段から所定回数連続
して出されたことを検出する計数手段と、この計数手段
の出力に基づいて作動し所定時間に於ける検出出力の最
大値と最小値を保持する保持手段と、その最大値と最小
値との差を演算し、その差が所定値以下であるならば前
記モータを停止させる停止制御手段とを具備してなるコ
ーヒーミル。2. A motor for rotationally driving a crushed body for crushing coffee beans, a current detection means for detecting a current flowing through the motor, and a 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 detected output and the present detected output stored in the storage means, and the amount of change after the start-up rush period of the motor calculated by the calculating means and the second The second comparing means for comparing the predetermined amount with the second comparing means outputs the output that the amount of change in the process of the coffee beans being substantially crushed and the motor current decreasing being equal to or greater than the second predetermined amount. Counting means for detecting that the means has continuously output a predetermined number of times, holding means that operates based on the output of the counting means and holds the maximum value and the minimum value of the detection output in a predetermined time, and the maximum value. Calculate the difference between the value and the minimum value, A coffee mill comprising stop control means for stopping the motor if the difference is less than a predetermined value.
するモータと、このモータに流れる電流を検出する電流
検出手段と、この電流検出手段からの検出出力を所定時
間毎に記憶する記憶手段と、この記憶手段に記憶した前
回の検出出力と今回の検出出力との変化量を演算する演
算手段と、この演算手段にて演算した前記モータの起動
突入期間経過後に於ける変化量と第２の所定量とを比較
する第２の比較手段と、変化量が第２の所定量以下であ
るとの前記第２の比較手段の出力に基づいて作動し所定
時間に於ける検出出力の最大値と最小値を保持する保持
手段と、その最大値と最小値との差を演算し、その差が
所定値以下であるならば前記モータを停止させる停止制
御手段とを具備してなるコーヒーミル。3. A motor for rotationally driving a crushed body for crushing coffee beans, a current detection means for detecting a current flowing through the motor, and a 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 detected output and the present detected output stored in the storage means, and the amount of change after the start-up rush period of the motor calculated by the calculating means and the second A second comparison means for comparing a predetermined amount and a maximum value of the detection output in a predetermined time, which is operated based on the output of the second comparison means that the variation amount is less than or equal to the second predetermined amount. A coffee mill comprising: holding means for holding a minimum value; and a stop control means for calculating a difference between the maximum value and the minimum value and stopping the motor if the difference is less than a predetermined value.
するモータと、このモータに流れる電流を検出する電流
検出手段と、この電流検出手段からの検出出力を所定時
間毎に記憶する記憶手段と、この記憶手段に記憶した前
回の検出出力と今回の検出出力との変化量を演算する演
算手段と、この演算手段にて演算した変化量と第１の所
定量とを比較する第１の比較手段と、変化量が前記第１
の所定量以上であって今回の検出出力が所定出力以上な
らば前記モータの停止制御を行う制御手段とを具備して
なるコーヒーミル。4. A motor for rotationally driving a crushed body for crushing coffee beans, a current detection means for detecting a current flowing through the motor, and a storage means for storing a detection output from the current detection means every predetermined time. A first comparing means for comparing the change amount calculated by the calculating means with a first predetermined amount, and a calculating means for calculating a change amount between the previous detected output and the present detected output stored in the storage means. And the change amount is the first
Of a predetermined amount or more and the detected output at this time is a predetermined output or more, control means for controlling the stop of the motor.
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 true JPH06133879A (en) | 1994-05-17 |
| JP2872868B2 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) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009119244A (en) * | 2007-08-29 | 2009-06-04 | Seb Sa | Method for counting number of revolutions of burr of coffee mill and appliance comprising the mill |
| CN103082866A (en) * | 2013-01-29 | 2013-05-08 | 苏州工业园区咖乐美电器有限公司 | Full-automatic coffee machine and self-locking power source thereof |
| US9675211B2 (en) | 2015-03-06 | 2017-06-13 | Helen Of Troy Limited | No-bean detection for coffee bean grinder |
| TWI764003B (en) * | 2018-06-07 | 2022-05-11 | 日商三菱動力股份有限公司 | Control device, control system, control method and program |
-
1992
- 1992-10-27 JP JP28834392A patent/JP2872868B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009119244A (en) * | 2007-08-29 | 2009-06-04 | Seb Sa | Method for counting number of revolutions of burr of coffee mill and appliance comprising the mill |
| CN103082866A (en) * | 2013-01-29 | 2013-05-08 | 苏州工业园区咖乐美电器有限公司 | Full-automatic coffee machine and self-locking power source thereof |
| US9675211B2 (en) | 2015-03-06 | 2017-06-13 | Helen Of Troy Limited | No-bean detection for coffee bean grinder |
| TWI764003B (en) * | 2018-06-07 | 2022-05-11 | 日商三菱動力股份有限公司 | Control device, control system, control method and program |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2872868B2 (en) | 1999-03-24 |
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