EP2051837B1 - Method for determining the dirtiness of an electrically driven cutting tool, and hair cutting device - Google Patents

Method for determining the dirtiness of an electrically driven cutting tool, and hair cutting device Download PDF

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Publication number
EP2051837B1
EP2051837B1 EP07801454.5A EP07801454A EP2051837B1 EP 2051837 B1 EP2051837 B1 EP 2051837B1 EP 07801454 A EP07801454 A EP 07801454A EP 2051837 B1 EP2051837 B1 EP 2051837B1
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Prior art keywords
parameter
cutting tool
changes
threshold value
motor
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German (de)
French (fr)
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EP2051837A2 (en
Inventor
Holger Hild
Thomas Hohmann
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Braun GmbH
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Braun GmbH
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B19/00—Clippers or shavers operating with a plurality of cutting edges, e.g. hair clippers, dry shavers
    • B26B19/38—Details of, or accessories for, hair clippers, or dry shavers, e.g. housings, casings, grips, guards
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B19/00—Clippers or shavers operating with a plurality of cutting edges, e.g. hair clippers, dry shavers
    • B26B19/38—Details of, or accessories for, hair clippers, or dry shavers, e.g. housings, casings, grips, guards
    • B26B19/3873—Electric features; Charging; Computing devices
    • B26B19/388—Sensors; Control

Definitions

  • the present invention relates to a method for determining the contamination of an electrically driven cutting tool and a hair trimmer with a device for determining the contamination of its electrically driven cutting tool.
  • this method finds favored application for determining and indicating the degree of soiling of a cutting tool that performs a reciprocating motion and is driven by, for example, an oscillating electric motor or a linear motor.
  • Hair trimmers with such a cutting tool are, for example, electric shavers, beard trimmers or the like.
  • a method of controlling an oscillating electric motor provided for, for example, driving an electric shaver or an electric toothbrush is known.
  • an electric current is supplied to a coil of the electric motor at a certain time to form a magnetic field emanating from a first engine component and acting on a second engine component such that the second engine component is vibrated relative to the first engine component.
  • At the time when a current is supplied to the coil at least one electrical characteristic of the coil is determined, which is related to the state of movement of the first or the second engine component, for example, the voltage applied to the coil and / or the current flowing through the coil and / or the temporal change of the current flowing through the coil.
  • the future power supply to the coil ie the control of the oscillating electric motor is dependent on the / the determined characteristic / n. Furthermore, in the DE 10229319 A1 describes how the vibration frequency and the vibration amplitude of the engine components can be determined.
  • a razor which has a vibration sensor in the form of a piezoelectric element for determining the contamination.
  • An output signal proportional to the amplitude of the vibration is supplied to a control circuit which determines the thickness of a bar from the signal.
  • the shaver operating time is detected and an indication is activated when the product of beard thickness and operating time exceeds a threshold.
  • the shaver is driven by a rotating DC motor whose rotational speed can be controlled depending on the thickness of the beard.
  • the US 2005/0144784 A1 describes a razor that can be switched by means of a switch between a normal drive mode and a cleaning drive mode.
  • the drive unit can be designed as a linear motor or rotary motor.
  • the drive frequency of the drive unit is adjusted by a control signal depending on the status of an on / off signal of the switch from a controller.
  • the shaver may further include an indicator indicating the need for cleaning.
  • the controller sends a signal that the drive unit is operated in the normal drive mode to an integration timer. This integration timer can integrate the time in which the drive unit is operated in the normal drive mode. If the total time exceeds a threshold TS, the indicator can be activated via a signal to the controller.
  • the parameter is, cf. for example DE 10229319 A1 , According to the invention determined as a function of continuous measurements of the motor current and / or the motor voltage and / or the temporal changes of the motor current.
  • the control of the oscillating electric motor or linear motor causes the cutting tool driven by the oscillating electric motor or linear motor always moves with the correct frequency and / or amplitude even with load fluctuations, ie with the frequency and / or amplitude to which the cutting tool tuned with its drive is.
  • the inventive method is based on the finding that changes in the characteristic are caused by changes in the current load of the cutting tool, these load fluctuations both by changing the operating state (idling, cutting, on or off the drive, etc.) as well as by each Cutting event can be caused.
  • the cutting tool performs a reciprocating motion and is driven by an oscillating electric motor or linear motor.
  • the shaver contains a clog indicator, which is activated as necessary to allow the shaver to be cleaned in due course.
  • the following method steps are carried out continuously, wherein in a shaver, the vibration frequency of the engine components, for example, 400 Hz, and preferably at least during each half-oscillation, a characteristic is determined, which is related to the respective state of motion of the cutting tool.
  • the first step of the method is to obtain a characteristic related to the respective amplitude of movement of the cutting tool.
  • This can, for example, in the from the DE 10229319 A1 done known manner.
  • the voltage applied to a coil of the electric motor and / or the current flowing through the coil and / or the time change of the current flowing through the coil are detected, and from this a parameter for the amplitude of the movement of the Determined cutting tool.
  • the determined parameter is stored, and a subsequently determined parameter is compared with the previously stored parameter.
  • a thus determined change in the characteristic may have a positive or negative sign, and is caused during shaving by load fluctuations, which may be due to the individual cutting operations or may be caused by varying degrees of pressing the shaving head to the skin.
  • the detection rate of the parameters for controlling the oscillating motor which oscillates at about 400 Hz, takes place at 800 Hz, since in the described exemplary embodiment a parameter is detected at each half-oscillation.
  • the evaluation of the parameters for determining the pollution does not have to be done at the same rate. For example, only every second parameter can be used for the evaluation. A stored parameter would thus be compared with the next but one parameter.
  • the frequency of the evaluation of the parameter for determining the contamination can thus be lower than the frequency with which the parameter is detected.
  • the characteristic change is compared with at least one threshold value.
  • a negative characteristic change is compared with a first threshold value and a positive characteristic change with a second threshold value.
  • a positive characteristic change arises, for example, in that the contact pressure decreases while the shaving head is guided over the skin during shaving or lifted off the skin.
  • the second threshold value is preferably selected such that, on the one hand, at least one lifting of the shaving head from the skin and the associated relief of the drive can be detected and, on the other hand, if necessary, small positive characteristic changes caused by disturbing influences are suppressed.
  • Positive characteristic changes, which are greater than the second threshold thus mean that the shaving head Had contact with the skin, and therefore, for example, is contaminated by skin fat.
  • a negative characteristic change arises, for example, in that at least a certain number of whiskers were cut and thereby the cutting tool was decelerated. Negative characteristic changes, the amount of which is greater than the first threshold, thus means that whiskers were cut, and therefore the shaving head is polluted by whitewash.
  • the pulses generated due to negative characteristic changes are more weighted when counting up the pollution counter than the pulses generated due to positive characteristic changes, since the pollution by whitewash requires cleaning of the shaving head rather than contamination by skin fat.
  • the magnitude of the first threshold value may also be selected differently than the magnitude of the second threshold value.
  • the count of the contamination counter is compared with a reference value corresponding to a certain contamination of the cutting tool.
  • the reaching or exceeding of the reference value is then displayed. This can be done in a conventional manner by a visual, audible or other indication.

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  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Dry Shavers And Clippers (AREA)
  • Brushes (AREA)

Description

Die vorliegende Erfindung betrifft ein Verfahren zur Bestimmung der Verschmutzung eines elektrisch angetriebenen Schneidwerkzeugs und ein Haarschneidegerät mit einer Einrichtung zur Bestimmung der Verschmutzung seines elektrisch angetriebenen Schneidwerkzeugs. Bevorzugte Anwendung findet dieses Verfahren beispielsweise zur Bestimmung und Anzeige des Verschmutzungsgrads eines Schneidwerkzeugs, das eine hin- und hergehende Bewegung ausführt und von beispielsweise einem oszillierenden Elektromotor oder Linearmotor angetrieben wird. Haarschneidegeräte mit einem derartigen Schneidwerkzeug sind beispielsweise elektrische Rasierapparate, Bartschneider oder dgl.The present invention relates to a method for determining the contamination of an electrically driven cutting tool and a hair trimmer with a device for determining the contamination of its electrically driven cutting tool. For example, this method finds favored application for determining and indicating the degree of soiling of a cutting tool that performs a reciprocating motion and is driven by, for example, an oscillating electric motor or a linear motor. Hair trimmers with such a cutting tool are, for example, electric shavers, beard trimmers or the like.

Aus der EP 0908278 B1 ist ein Verfahren zur Bestimmung der Menge des von einem elektrisch angetriebenen Schneidwerkzeug geschnittenen Schneidguts bekannt, das auf der Erkenntnis beruht, dass die Stromaufnahme eines das Schneidwerkzeug antreibenden Gleichstrommotors Schwankungen unterworfen ist, die durch die einzelnen Schneidvorgänge bedingt sind. Diese Stromschwankungen werden erfasst, ausgewertet und als Maß für die Menge des geschnittenen Schneidguts verwendet. Bei Anwendung dieses Verfahrens in einem Haarschneidegerät wird außerdem nach Erreichen eines bestimmten Referenzwerts für die Menge des geschnittenen Schneidguts eine Anzeigeeinrichtung aktiviert, die den Benutzer über die Notwendigkeit einer Reinigung des Haarschneidegeräts informiert.From the EP 0908278 B1 For example, there is known a method of determining the amount of cut material cut by an electrically driven cutting tool based on the knowledge that the current consumption of a direct current motor driving the cutting tool is subject to variations caused by the individual cutting operations. These current fluctuations are recorded, evaluated and used as a measure of the amount of cut material to be cut. When using this method in a hair trimmer, a display device is also activated after reaching a certain reference value for the amount of cut material to be cut, which informs the user of the need to clean the hair trimmer.

Aus der DE 10229319 A1 ist ein Verfahren zur Steuerung eines oszillierenden Elektromotors bekannt, der beispielsweise zum Antreiben eines elektrischen Rasierapparats oder einer elektrischen Zahnbürste vorgesehen ist. Bei diesem Verfahren wird einer Spule des Elektromotors zu einem bestimmten Zeitpunkt ein elektrischer Strom zur Ausbildung eines Magnetfelds zugeführt, das von einer ersten Motorkomponente ausgeht und auf eine zweite Motorkomponente derart einwirkt, dass die zweite Motorkomponente relativ zur ersten Motorkomponente in eine Schwingungsbewegung versetzt wird. Zu dem Zeitpunkt, zu dem eine Stromzufuhr zur Spule erfolgt, wird wenigstens eine elektrische Kenngröße der Spule ermittelt, die mit dem Bewegungszustand der ersten oder der zweiten Motorkomponente zusammenhängt, beispielsweise die an der Spule anliegende Spannung und/oder der durch die Spule fließende Strom und/oder die zeitliche Änderung des durch die Spule fließenden Stroms. Die zukünftige Stromzufuhr zur Spule, d.h. die Steuerung des oszillierenden Elektromotors erfolgt abhängig von der/den ermittelten Kenngröße/n. Weiterhin ist in der DE 10229319 A1 beschrieben, wie die Schwingungsfrequenz und auch die Schwingungsamplitude der Motorkomponenten ermittelt werden können.From the DE 10229319 A1 For example, a method of controlling an oscillating electric motor provided for, for example, driving an electric shaver or an electric toothbrush is known. In this method, an electric current is supplied to a coil of the electric motor at a certain time to form a magnetic field emanating from a first engine component and acting on a second engine component such that the second engine component is vibrated relative to the first engine component. At the time when a current is supplied to the coil, at least one electrical characteristic of the coil is determined, which is related to the state of movement of the first or the second engine component, for example, the voltage applied to the coil and / or the current flowing through the coil and / or the temporal change of the current flowing through the coil. The future power supply to the coil, ie the control of the oscillating electric motor is dependent on the / the determined characteristic / n. Furthermore, in the DE 10229319 A1 describes how the vibration frequency and the vibration amplitude of the engine components can be determined.

Aus der JP 4 314486 A ist ein Rasierapparat bekannt, der zur Bestimmung der Verschmutzung einen Vibrationssensor in Form eines piezoelektrischen Elements aufweist. Ein zur Amplitude der Vibration proportionales Ausgangssignal wird einer Steuerschaltung zugeführt, welche aus dem Signal die Dicke eines Barts bestimmt. Ferner wird die Betriebszeit des Rasierapparats erfasst, und eine Anzeige aktiviert, wenn das Produkt aus Bartdicke und der Betriebszeit einen Schwellwert übersteigt. Der Rasierapparat wird von einem rotierenden Gleichstrommotor angetrieben, dessen Rotationsgeschwindigkeit in Abhängigkeit der Bartdicke gesteuert werden kann.From the JP 4 314486 A a razor is known, which has a vibration sensor in the form of a piezoelectric element for determining the contamination. An output signal proportional to the amplitude of the vibration is supplied to a control circuit which determines the thickness of a bar from the signal. Further, the shaver operating time is detected and an indication is activated when the product of beard thickness and operating time exceeds a threshold. The shaver is driven by a rotating DC motor whose rotational speed can be controlled depending on the thickness of the beard.

Die US 2005/0144784 A1 beschreibt ein Rasierapparat, der mittels eines Schalters zwischen einem normalen Antriebsmodus und einem Reinigungsantriebsmodus umgeschaltet werden kann. Die Antriebseinheit kann als linearer Motor oder Rotationsmotor ausgebildet sein. Die Antriebsfrequenz der Antriebseinheit wird durch ein Kontrollsignal in Abhängigkeit des Status eines On/Off-Signals des Schalters von einem Controller eingestellt. Der Rasierapparat kann weiter einen Indikator aufweisen, der die Notwendigkeit einer Reinigung anzeigt. Dazu sendet der Controller ein Signal, dass die Antriebseinheit im normalen Antriebsmodus betrieben wird, an einen Integrations-Timer. Dieser Integrations-Timer kann die Zeit aufintegrieren, in der die Antriebseinheit im normalen Antriebsmodus betrieben wird. Wenn die Gesamtzeit einen Schwellwert TS überschreitet, kann über ein Signal an den Controller der Indikator aktiviert werden.The US 2005/0144784 A1 describes a razor that can be switched by means of a switch between a normal drive mode and a cleaning drive mode. The drive unit can be designed as a linear motor or rotary motor. The drive frequency of the drive unit is adjusted by a control signal depending on the status of an on / off signal of the switch from a controller. The shaver may further include an indicator indicating the need for cleaning. For this purpose, the controller sends a signal that the drive unit is operated in the normal drive mode to an integration timer. This integration timer can integrate the time in which the drive unit is operated in the normal drive mode. If the total time exceeds a threshold TS, the indicator can be activated via a signal to the controller.

Es ist Aufgabe der vorliegenden Erfindung ein Verfahren zur Bestimmung der Verschmutzung eines Schneidwerkzeugs anzugeben, das von einem oszillierenden Elektromotor oder Linearmotor angetrieben wird und eine hin- und hergehende Bewegung ausführt, sowie ein Haarschneidegerät mit einem derartigen Schneidwerkzeug anzugeben, das eine Einrichtung zur Bestimmung der Verschmutzung seines Schneidwerkzeugs aufweist.It is an object of the present invention to provide a method for determining the contamination of a cutting tool, which is driven by an oscillating electric motor or linear motor and performs a reciprocating motion, as well as to provide a hair trimmer with such a cutting tool, the means for determining the pollution having its cutting tool.

Das erfindungsgemäße Verfahren gemäß Anspruch 1 verwendet zur Bestimmung der Verschmutzung des von einem oszillierenden Elektromotor oder Linearmotor angetriebenen Schneidwerkzeugs mindestens eine Kenngröße, die in an sich bekannter Weise von einer Steuereinrichtung zur Steuerung des oszillierenden Elektromotors oder Linearmotors ermittelt wird, und die mit dem jeweiligen Bewegungszustand des Schneidwerkzeugs zusammenhängt. Die Kenngröße wird, vgl. beispielsweise DE 10229319 A1 , erfindungsgemäß in Abhängigkeit von fortlaufenden Messungen des Motorstroms und/oder der Motorspannung und/oder der zeitlichen Änderungen des Motorstroms ermittelt. Die Steuerung des oszillierenden Elektromotors oder Linearmotors bewirkt, dass sich das vom oszillierenden Elektromotor oder Linearmotor angetriebene Schneidwerkzeug auch bei Belastungsschwankungen immer mit der richtigen Frequenz und/ oder Amplitude bewegt, d.h. mit der Frequenz und/oder Amplitude, auf die das Schneidwerkzeug mit seinem Antrieb abgestimmt ist. Das erfindungsgemäße Verfahren beruht auf der Erkenntnis, dass Änderungen der Kenngröße durch Änderungen der momentanen Belastung des Schneidwerkzeugs hervorgerufen werden, wobei diese Belastungsschwankungen sowohl durch Änderung des Betriebszustands (Leerlauf, Schneiden, Ein- oder Ausschalten des Antriebs, etc.) als auch durch jedes einzelne Schneidereignis hervorgerufen werden können.The inventive method according to claim 1 used to determine the contamination of the driven by an oscillating electric motor or linear motor cutting tool at least one characteristic which is determined in a conventional manner by a control device for controlling the oscillating electric motor or linear motor, and with the respective state of motion of Cutting tool is related. The parameter is, cf. for example DE 10229319 A1 , According to the invention determined as a function of continuous measurements of the motor current and / or the motor voltage and / or the temporal changes of the motor current. The control of the oscillating electric motor or linear motor causes the cutting tool driven by the oscillating electric motor or linear motor always moves with the correct frequency and / or amplitude even with load fluctuations, ie with the frequency and / or amplitude to which the cutting tool tuned with its drive is. The inventive method is based on the finding that changes in the characteristic are caused by changes in the current load of the cutting tool, these load fluctuations both by changing the operating state (idling, cutting, on or off the drive, etc.) as well as by each Cutting event can be caused.

Die Erfindung wird nachstehend anhand eines Rasierapparats als Ausführungsbeispiel erläutert, dessen Schneidwerkzeug eine hin- und hergehende Bewegung ausführt und von einem oszillierenden Elektromotor oder Linearmotor angetrieben wird. Die Erfindung ist jedoch natürlich auch bei anderen Schneidwerkzeugen einsetzbar. Der Rasierapparat enthält eine Verschmutzungsanzeige, die erforderlichenfalls aktiviert wird, damit der Rasierapparat zu gegebener Zeit gereinigt werden kann. Die nachfolgend genannten Verfahrensschritte werden fortlaufend durchgeführt, wobei bei einem Rasierapparat die Schwingungsfrequenz der Motorkomponenten beispielsweise 400 Hz beträgt, und vorzugsweise zumindest während jeder Halbschwingung eine Kenngröße ermittelt wird, die mit dem jeweiligen Bewegungszustand des Schneidwerkzeugs zusammenhängt.The invention will be explained below with reference to a razor as an embodiment, the cutting tool performs a reciprocating motion and is driven by an oscillating electric motor or linear motor. However, the invention is of course also applicable to other cutting tools. The shaver contains a clog indicator, which is activated as necessary to allow the shaver to be cleaned in due course. The following method steps are carried out continuously, wherein in a shaver, the vibration frequency of the engine components, for example, 400 Hz, and preferably at least during each half-oscillation, a characteristic is determined, which is related to the respective state of motion of the cutting tool.

Der erste Schritt des Verfahrens besteht darin, eine Kenngröße zu gewinnen, die mit der jeweiligen Amplitude der Bewegung des Schneidwerkzeugs zusammenhängt. Dies kann beispielsweise in der aus der DE 10229319 A1 bekannten Weise erfolgen. Dazu wird zumindest während jeder Halbschwingung des Schneidwerkzeugs beispielsweise die an einer Spule des Elektromotors anliegende Spannung und/oder der durch die Spule fließende Strom und/oder die zeitliche Änderung des durch die Spule fließenden Stroms erfasst, und daraus eine Kenngröße für die Amplitude der Bewegung des Schneidwerkzeugs ermittelt.The first step of the method is to obtain a characteristic related to the respective amplitude of movement of the cutting tool. This can, for example, in the from the DE 10229319 A1 done known manner. For this purpose, at least during each half cycle of the cutting tool, for example, the voltage applied to a coil of the electric motor and / or the current flowing through the coil and / or the time change of the current flowing through the coil are detected, and from this a parameter for the amplitude of the movement of the Determined cutting tool.

In einem zweiten Schritt wird die ermittelte Kenngröße gespeichert, und eine nachfolgend ermittelte Kenngröße mit der zuvor gespeicherten Kenngröße verglichen. Eine dadurch ermittelte Änderung der Kenngröße kann ein positives oder negatives Vorzeichen haben, und wird während des Rasierens durch Belastungsschwankungen hervorgerufen, die durch die einzelnen Schneidvorgänge bedingt sein können oder durch unterschiedlich starkes Anpressen des Scherkopfs auf die Haut entstehen können. Die Erfassungsrate der Kenngrößen zur Steuerung des oszillierenden Motors, der etwa mit 400 Hz schwingt, erfolgt mit 800 Hz, da in der beschriebenen beispielhaften Ausführungsform bei jeder Halbschwingung eine Kenngröße erfasst wird. Die Auswertung der Kenngrößen zur Bestimmung der Verschmutzung muss allerdings nicht ebenfalls mit der gleichen Rate erfolgen. So kann beispielsweise nur jede zweite Kenngröße für die Auswertung herangezogen werden. Eine gespeicherte Kenngröße würde also erst mit der übernächsten Kenngröße verglichen werden. Die Frequenz der Auswertung der Kenngröße zur Bestimmung der Verschmutzung kann also niedriger sein als die Frequenz, mit der die Kenngröße erfasst wird.In a second step, the determined parameter is stored, and a subsequently determined parameter is compared with the previously stored parameter. A thus determined change in the characteristic may have a positive or negative sign, and is caused during shaving by load fluctuations, which may be due to the individual cutting operations or may be caused by varying degrees of pressing the shaving head to the skin. The detection rate of the parameters for controlling the oscillating motor, which oscillates at about 400 Hz, takes place at 800 Hz, since in the described exemplary embodiment a parameter is detected at each half-oscillation. However, the evaluation of the parameters for determining the pollution does not have to be done at the same rate. For example, only every second parameter can be used for the evaluation. A stored parameter would thus be compared with the next but one parameter. The frequency of the evaluation of the parameter for determining the contamination can thus be lower than the frequency with which the parameter is detected.

In einem dritten Schritt wird die Kenngrößenänderung mit mindestens einem Schwellwert verglichen. Vorzugsweise wird eine negative Kenngrößenänderung mit einem ersten Schwellwert und eine positive Kenngrößenänderung mit einem zweiten Schwellwert verglichen. Eine positive Kenngrößenänderung entsteht beispielsweise dadurch, dass der Anpressdruck abnimmt, während der Scherkopf beim Rasieren über die Haut geführt oder von der Haut abgehoben wird. Der zweite Schwellwert ist vorzugsweise so gewählt, dass einerseits zumindest ein Abheben des Scherkopfs von der Haut und die damit verbundene Entlastung des Antriebs detektiert werden kann und andererseits ggf. durch Störeinflüsse hervorgerufene kleine positive Kenngrößenänderungen unterdrückt werden. Positive Kenngrößenänderungen, die größer sind als der zweite Schwellwert, bedeuten also, dass der Scherkopf Kontakt mit der Haut hatte, und daher beispielsweise durch Hautfett verschmutzt ist. Eine negative Kenngrößenänderung entsteht beispielsweise dadurch, dass zumindest eine bestimmte Anzahl von Barthaaren geschnitten und dadurch das Schneidwerkzeug abgebremst wurde. Negative Kenngrößenänderungen, deren Betrag größer ist als der erste Schwellwert, bedeuten also, dass Barthaare geschnitten wurden, und daher der Scherkopf durch Bartstaub verschmutzt ist.In a third step, the characteristic change is compared with at least one threshold value. Preferably, a negative characteristic change is compared with a first threshold value and a positive characteristic change with a second threshold value. A positive characteristic change arises, for example, in that the contact pressure decreases while the shaving head is guided over the skin during shaving or lifted off the skin. The second threshold value is preferably selected such that, on the one hand, at least one lifting of the shaving head from the skin and the associated relief of the drive can be detected and, on the other hand, if necessary, small positive characteristic changes caused by disturbing influences are suppressed. Positive characteristic changes, which are greater than the second threshold, thus mean that the shaving head Had contact with the skin, and therefore, for example, is contaminated by skin fat. A negative characteristic change arises, for example, in that at least a certain number of whiskers were cut and thereby the cutting tool was decelerated. Negative characteristic changes, the amount of which is greater than the first threshold, thus means that whiskers were cut, and therefore the shaving head is polluted by whitewash.

Jedesmal wenn der Betrag der Kenngrößenänderung größer ist als der erste bzw. zweite Schwellwert, wird ein Impuls erzeugt, der von einem Verschmutzungszähler gezählt wird. Vorzugsweise werden die aufgrund negativer Kenngrößenänderungen erzeugten Impulse beim Hochzählen des Verschmutzungszählers stärker gewichtet als die aufgrund positiver Kenngrößenänderungen erzeugten Impulse, da die Verschmutzung durch Bartstaub eher eine Reinigung des Scherkopfs erfordert als eine Verschmutzung durch Hautfett. Alternativ oder zusätzlich zur unterschiedlichen Wichtung der Verschmutzungsereignisse kann auch der Betrag des ersten Schwellwerts anders gewählt sein als der Betrag des zweiten Schwellwerts.Each time the magnitude of the characteristic change is greater than the first and second threshold, respectively, a pulse is generated which is counted by a fouling counter. Preferably, the pulses generated due to negative characteristic changes are more weighted when counting up the pollution counter than the pulses generated due to positive characteristic changes, since the pollution by whitewash requires cleaning of the shaving head rather than contamination by skin fat. As an alternative or in addition to the different weighting of the contamination events, the magnitude of the first threshold value may also be selected differently than the magnitude of the second threshold value.

Wenn keine negativen Kenngrößenänderungen detektiert werden, allerdings positive Kenngrößenänderungen vorliegen, kann dies ein Indiz dafür sein, dass der Benutzer einen sehr weichen Bart hat, sodass das Schneiden der weichen Haare keine detektierbare Kenngrößenänderung hervorruft. Trotz fehlender negativer Kenngrößenänderungen kommt es dabei natürlich zu abgeschnittenen Barthaaren und damit zu einer Verschmutzung. Dies kann dann durch eine Anpassung der Wichtung der durch positive Kenngrößenänderung erzeugten Impulse berücksichtigt werden, sodass die tatsächliche Verschmutzung durch die weicheren Barthaare berücksichtigt wird. Geeignete Wichtungswerte können in einem Speicher abgelegt sein.If no negative characteristic changes are detected, but there are positive characteristic changes, this can be an indication that the user has a very soft beard, so that the cutting of the soft hair causes no detectable characteristic change. In spite of the fact that there are no negative parameter changes, this naturally leads to truncated whiskers and thus to contamination. This can then be taken into account by adjusting the weighting of the pulses generated by positive characteristic change, so that the actual soiling is taken into account by the softer whiskers. Suitable weighting values can be stored in a memory.

In einem vierten Schritt wird der Zählerstand des Verschmutzungszählers mit einem Referenzwert verglichen, der einer bestimmte Verschmutzung des Schneidwerkzeugs entspricht. Das Erreichen oder Überschreiten des Referenzwerts wird dann angezeigt. Dies kann in an sich bekannter Weise durch eine optische, akustische oder sonstige Anzeige erfolgen.In a fourth step, the count of the contamination counter is compared with a reference value corresponding to a certain contamination of the cutting tool. The reaching or exceeding of the reference value is then displayed. This can be done in a conventional manner by a visual, audible or other indication.

Claims (5)

  1. Method for determining the soiling of an electrically driven cutting tool which is driven by an oscillating electric motor or linear motor and executes a back and forth movement, wherein in the method a parameter for the movement of the cutting tool is evaluated, which parameter is used to control the oscillating electric motor or linear motor, characterized in that the parameter is determined as a function of continuous measurements of the motor current and/or of the motor voltage and/or of the variations over time of the motor current, wherein continuous changes of the parameter are recorded and registered as a soiling event insofar as the absolute value of a variation is greater than a threshold value,
    wherein a first and a second threshold value are provided, and wherein negative changes of the parameter are compared with the first threshold value and positive changes of the parameter are compared with the second threshold value.
  2. Method according to claim 1,
    characterized in that
    a parameter for the amplitude of the movement of the cutting tool is used.
  3. Method according to claim 1 or 2,
    characterized in that
    a counter for counting the soiling events is provided, and that negative changes of the parameter are more strongly weighted during counting than positive changes of the parameter.
  4. Method according to any one of the preceding claims,
    characterized in that
    the absence of either negative or positive changes of the parameter leads to the recorded changes of the parameter being weighted with a modified value.
  5. Hair cutting device having an electrically driven cutting tool which is configured to execute a back and forth movement; and an oscillating electric motor or linear motor which is configured to drive the cutting tool; and means for evaluating a parameter for the movement of the cutting tool, which parameter is used to control the oscillating electric motor or linear motor, and wherein the means are configured to determine the parameter as a function of continuous measurements of the motor current and/or of the motor voltage and/or of the variations over time of the motor current; wherein continuous changes of the parameter are recorded and registered as a soiling event insofar as the absolute value of a variation is greater than a threshold value; wherein a first and a second threshold value are provided; and wherein negative changes of the parameter are compared with the first threshold value and positive changes of the parameter are compared with the second threshold value.
EP07801454.5A 2006-08-14 2007-07-26 Method for determining the dirtiness of an electrically driven cutting tool, and hair cutting device Active EP2051837B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200610038126 DE102006038126A1 (en) 2006-08-14 2006-08-14 Method for determining the contamination of an electrically driven cutting tool and hair clipper
PCT/EP2007/006622 WO2008019754A2 (en) 2006-08-14 2007-07-26 Method for determining the dirtiness of an electrically driven cutting tool, and hair cutting device

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EP2051837A2 EP2051837A2 (en) 2009-04-29
EP2051837B1 true EP2051837B1 (en) 2019-05-15

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WO2012023121A2 (en) * 2010-08-19 2012-02-23 Braun Gmbh Method for operating an electric appliance and electric appliance
JP6266141B2 (en) * 2014-06-20 2018-01-24 コーニンクレッカ フィリップス エヌ ヴェＫｏｎｉｎｋｌｉｊｋｅ Ｐｈｉｌｉｐｓ Ｎ．Ｖ． Electric shaver with cleaning indicator

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DE69808400T2 (en) * 1997-08-04 2003-07-31 Izumi Prod Co Electric shaver
US20050144784A1 (en) * 2002-06-12 2005-07-07 Yasuo Ibuki Electric razor

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US4583027A (en) 1982-12-27 1986-04-15 Hitachi Metals International, Ltd. Moving magnet linear motor
JP3171868B2 (en) * 1991-04-15 2001-06-04 松下電工株式会社 Electric razor
JPH04314487A (en) * 1991-04-15 1992-11-05 Matsushita Electric Works Ltd Electric razor
US5274735A (en) * 1991-12-16 1993-12-28 Sanyo Electric Co., Ltd. Electric shaver
JPH0538387A (en) * 1992-01-28 1993-02-19 Matsushita Electric Works Ltd Electrical razor
EP0674979B2 (en) 1994-03-28 2003-08-27 Matsushita Electric Works, Ltd. Reciprocatory dry shaver
DE19743853C1 (en) * 1997-10-04 1998-11-26 Braun Ag Method of determining amount of material cut by electrically powered cutting tool esp. saving apparatus
DE10229319A1 (en) 2002-06-29 2004-01-29 Braun Gmbh Method for controlling an oscillating electric motor of a small electrical appliance

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DE69808400T2 (en) * 1997-08-04 2003-07-31 Izumi Prod Co Electric shaver
US20050144784A1 (en) * 2002-06-12 2005-07-07 Yasuo Ibuki Electric razor

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RU2441745C2 (en) 2012-02-10
US9114542B2 (en) 2015-08-25
CN101505929A (en) 2009-08-12
JP2010500137A (en) 2010-01-07
DE102006038126A1 (en) 2008-02-21
EP2051837A2 (en) 2009-04-29
CN101505929B (en) 2012-08-08
WO2008019754A3 (en) 2008-06-05
JP5208941B2 (en) 2013-06-12
US20110197455A1 (en) 2011-08-18
WO2008019754A2 (en) 2008-02-21
RU2009109190A (en) 2010-09-27

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