EP0908278A2 - Verfahren zur Bestimmung der Menge des von einem elektrisch angetriebenen Schneidwerkzeug geschnittenen Schneidguts sowie Schaltungsanordnung zur Durchführung des Verfahrens - Google Patents
Verfahren zur Bestimmung der Menge des von einem elektrisch angetriebenen Schneidwerkzeug geschnittenen Schneidguts sowie Schaltungsanordnung zur Durchführung des Verfahrens Download PDFInfo
- Publication number
- EP0908278A2 EP0908278A2 EP98114058A EP98114058A EP0908278A2 EP 0908278 A2 EP0908278 A2 EP 0908278A2 EP 98114058 A EP98114058 A EP 98114058A EP 98114058 A EP98114058 A EP 98114058A EP 0908278 A2 EP0908278 A2 EP 0908278A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- pulses
- circuit arrangement
- pass filter
- cut
- arrangement according
- 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
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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
- B26B19/3873—Electric features; Charging; Computing devices
- B26B19/388—Sensors; Control
-
- 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
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D5/00—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
- B26D7/22—Safety devices specially adapted for cutting machines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
- B26D7/27—Means for performing other operations combined with cutting
Definitions
- the present invention relates to a method for determining the amount of an electrically driven cutting tool cut material and a Circuit arrangement for performing the method.
- the method according to the invention is suitable for cutting tools with which material to be cut in a plurality of individual cutting processes, and is intended especially for those their function after a certain operating time through the cut material is affected.
- This method is preferably used, for example, for Measurement and display of the degree of contamination of an electrically powered shaver, Beard trimmer or the like ..
- JP-A-02-241480 by means of a light barrier Measure the amount of accumulated shaving dust in the shaving head and after exceeding it a threshold value to indicate the need for cleaning.
- a razor the degree of pollution according to one of the latter two Process is determined, necessarily contains appropriate in the shaving head Measuring devices. This increases compared to a razor without a contamination indicator the design effort is considerable.
- a method for determining and displaying the Specify the degree of contamination of an electrically driven cutting tool It is also an object of the invention to provide a circuit arrangement for carrying out the specify method according to the invention.
- the method according to the invention is based on the knowledge that the current consumption of an electrically driven cutting tool is subject to fluctuations that due to the changing load on the cutting tool when cutting the material to be cut are caused. According to the invention, these are by the individual Cutting processes fluctuations in the drive motor of the cutting tool recorded current recorded, evaluated and as a measure of the amount of cut material to be used.
- the cut hair is inside the Accumulate the shaving head and impair the function of the device over time can be cleaned from time to time. According to a training of the Invention is therefore after reaching a certain reference value for the amount of cut material activated a display that the user on the Informed need for cleaning.
- the invention is described below using a razor as an embodiment explained. However, the invention can also be used with other cutting tools, especially those that have to be freed from cutting material from time to time.
- the first step of the method according to the invention is to detect the fluctuations in the current which is taken up by the drive motor of the shaving apparatus, ie to generate a corresponding measurement signal. This is done by a sensor, for example a resistor in the motor circuit, from which voltage fluctuations proportional to the current fluctuations are tapped. However, the current fluctuations can also be detected by inductive or other components.
- the second step of the method according to the invention consists of filtering the measurement signal. As a result, all of the fluctuations detected are filtered out whose frequency does not lie within a specific frequency range. This can be done, for example, by a low-pass filter that suppresses higher-frequency interference pulses originating from the motor.
- the third step of the method according to the invention consists of evaluating the pulses. In the two simplest cases, this is done by counting the number or adding up the length of the pulses. An integration of the impulses is more precise.
- the fourth step of the method according to the invention consists of comparing the count value, the total length, or the integrated area of the pulses with a reference value that corresponds to a specific quantity of material to be cut. The reaching or exceeding of the reference value is then displayed. This can be done in a manner known per se by means of an optical, acoustic or other display. If necessary, intermediate steps, such as the amplification of the measurement signal and / or the pulses, are also inserted.
- a circuit arrangement for carrying out the method according to the invention is shown in shown in the drawing.
- This circuit arrangement is very general for evaluation of current fluctuations, and therefore not only for cutting tools usable. Further configurations are described in the description.
- the circuit arrangement according to the invention contains a sensor, a filter circuit, an evaluation circuit and a Display device.
- the sensor consists of a measuring resistor R1, which is in the circuit of a is switched via a switch S1 on / off direct current motor M, which is powered by a two-cell battery AC1, AC2.
- the measuring resistor is part of a voltage divider consisting of three resistors R1, R2, R6 on which the voltage of the accumulator is present. This also serves to power the Filter circuit, evaluation circuit and the display device. In other versions a battery or a power supply unit serves as a power supply.
- the filter circuit consists of an active bandpass filter, which is a first low-pass filter R3 / C1 with a first cut-off frequency and a second low-pass filter R4 / C2 with a second limit frequency and an operational amplifier A contains.
- the second low pass filter R4 / C2 is between the connection point of the measuring resistor R1 with the next resistor R2 of the voltage divider and the non-inverting input of the Operational amplifier A, and the first low-pass filter R3 / C1 between the connection point of the next resistor R2 with the third resistor R6 of the voltage divider and the inverting input of operational amplifier A is switched.
- the output of the operational amplifier A is with the evaluation circuit IC and via a Resistor R5 connected to the positive pole of the accumulator.
- the evaluation circuit consists of a microcontroller IC to which the display device D is connected. This has several segments that are used to display the Degree of contamination of the shaving head and the state of charge of the battery from Microcontroller IC can be controlled individually. The state of charge is shown in the the example shown in 20% increments. Of course, the clogging indicator also by means of a light emitting diode, an electroacoustic transducer or the like.
- the microcontroller IC is connected to a device through which the count value and thus the contamination indicator are reset to zero can. This can be, for example, a switch S2, which switches on in a manner known per se
- the shaving head is arranged so that when the shaving head is removed the reset is carried out automatically he follows.
- the first low-pass filter R3 / C1 serves to suppress interference signals, which in particular are caused by the commutator of the DC motor M. It has one higher cut-off frequency than the second low-pass filter R4 / C2.
- the bandpass characteristic of the Filter circuit results from the fact that a low-pass filter on the inverting Input and the other to the non-inverting input of the operational amplifier A is connected.
- the resistance R6 of the voltage divider creates an amplitude threshold set for the measurement signal, so that only signals with a certain Minimum size can be filtered and evaluated.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Forests & Forestry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Dry Shavers And Clippers (AREA)
- Measurement Of Current Or Voltage (AREA)
- Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
- Sampling And Sample Adjustment (AREA)
- Machine Tool Sensing Apparatuses (AREA)
Abstract
Description
Der zweite Schritt des erfindungsgemäßen Verfahrens besteht aus der Filterung des Meßsignals. Dadurch werden von den erfaßten Schwankungen alle die ausgefiltert, deren Frequenz nicht innerhalb eines bestimmten Frequenzbereichs liegt. Dies kann beispielsweise durch ein Tiefpaßfilter erfolgen, das vom Motor herrührende höherfrequente Störimpulse unterdrückt. Ferner müssen niederfrequente Schwankungen des Motorstroms, die beispielsweise durch eine schwankende Betriebsspannung hervorgerufen werden, unterdrückt werden. Außerdem werden vorzugsweise nur Schwankungen berücksichtigt, deren Amplitude einen voreinstellbaren Schwellwert übersteigt. Auf diese Weise werden aus dem Meßsignal nur für den Schneidvorgang charakteristische Impulse gewonnen.
Der dritte Schritt des erfindungsgemäßen Verfahrens besteht aus der Auswertung der Impulse. Dies erfolgt in den beiden einfachsten Fällen durch Zählen der Anzahl oder Aufsummieren der Länge der Impulse. Genauer ist eine Integration der Impulse. Der vierte Schritt des erfindungsgemäßen Verfahrens besteht aus dem Vergleich des Zählwerts, der aufsummierten Länge, oder der aufintegrierten Fläche der Impulse mit einem Referenzwert, der einer bestimmten Menge an geschnittenem Schneidgut 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.
Erforderlichenfalls werden noch Zwischenschritte, wie beispielsweise die Verstärkung des Meßsignals und/oder der Impulse eingefügt.
Claims (16)
- Verfahren zur Bestimmung der Menge des von einem elektrisch angetriebenen Schneidwerkzeug geschnittenen Schneidguts,
dadurch gekennzeichnet,
daß die Schwankungen des während des Schneidvorgangs vom Antrieb des Schneidwerkzeugs aufgenommenen Stroms erfaßt und ausgewertet werden. - Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
daß die Stromschwankungen in Spannungsschwankungen oder dgl. umgewandelt werden. - Verfahren nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
daß von den erfaßten Schwankungen alle die ausgefiltert werden, deren Frequenz nicht innerhalb eines bestimmten Frequenzbereichs liegt, sodaß nur für den Schneidvorgang charakteristische Impulse ausgewertet werden. - Verfahren nach Anspruch 3,
dadurch gekennzeichnet,
daß bei der Auswertung der Impulse die Anzahl der Impulse gezählt wird. - Verfahren nach Anspruch 3,
dadurch gekennzeichnet,
daß bei der Auswertung der Impulse die Länge der Impulse aufaddiert wird. - Verfahren nach Anspruch 3,
dadurch gekennzeichnet,
daß bei der Auswertung der Impulse die Impulse aufintegriert werden. - Verfahren nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß nur Impulse ausgewertet werden, deren Amplitude einen bestimmten Schwellwert übersteigt. - Verwendung des Verfahren nach einem der vorhergehenden Ansprüche zur Bestimmung und Anzeige des Verschmutzungsgrads eines Schneidwerkzeugs, insbesondere eines Rasierapparats, Bartschneiders oder dgl.,
dadurch gekennzeichnet,
daß nach Erreichen eines bestimmten Schwellwerts für die Menge des geschnittenen Schneidguts eine Anzeigeeinrichtung zur Information des Benutzers über die Notwendigkeit einer Reinigung aktiviert wird. - Schaltungsanordnung zur Durchführung des Verfahrens nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß sie einen Meßaufnehmer zur Erzeugung eines Meßsignals für den vom Antrieb aufgenommenen Strom, eine Einrichtung zur Filterung des Meßsignals, und eine Einrichtung zur Auswertung des gefilterten Meßsignals aufweist. - Schaltungsanordnung nach Anspruch 9,
dadurch gekennzeichnet,
daß der Meßaufnehmer aus einem Widerstand (R1) besteht. - Schaltungsanordnung nach Anspruch 9 oder 10,
dadurch gekennzeichnet,
daß die Einrichtung zur Filterung mindestens ein Tiefpaßfilter oder ein Bandpaßfilter enthält. - Schaltungsanordnung nach Anspruch 11,
dadurch gekennzeichnet,
daß das Bandpaßfilter ein erstes Tiefpaßfilter (R3/C1) mit einer ersten Grenzfrequenz und ein zweites Tiefpaßfilter (R4/C2) mit einer zweiten Grenzfrequenz sowie einen Operationsverstärker (A) enthält, und daß das eine Tiefpaßfilter an den invertierenden und das andere Tiefpaßfilter an den nichtinvertierenden Eingang des Operationsverstärkers (A) angeschlossen sind. - Schaltungsanordnung nach einem der Ansprüche 9 bis 12,
dadurch gekennzeichnet,
daß die Einrichtung zur Auswertung des gefilterten Meßsignals einen Mikrokontroller (IC) enthält. - Schaltungsanordnung nach Anspruch 13,
dadurch gekennzeichnet,
daß sie eine Anzeigeeinrichtung (D) für den Verschmutzungsgrad aufweist, die vom Mikrokontroller (IC) ansteuerbar ist. - Schaltungsanordnung nach Anspruch 13 oder 14,
dadurch gekennzeichnet,
daß sie eine Vorrichtung (S2) zum Zurücksetzen der Anzeige des Verschmutzungsgrads aufweist, die mit dem Mikrokontroller (IC) verbunden ist. - Schaltungsanordnung nach einem der Ansprüche 9 bis 15,
dadurch gekennzeichnet,
daß sie eine Einrichtung zur Einstellung eines Schwellwerts (R6) für das Meßsignal aufweist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19743853 | 1997-10-04 | ||
DE19743853A DE19743853C1 (de) | 1997-10-04 | 1997-10-04 | Verfahren zur Bestimmung der Menge des von einem elektrisch angetriebenen Schneidwerkzeug geschnittenen Schneidguts sowie Schaltungsanordnung zur Durchführung des Verfahrens |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0908278A2 true EP0908278A2 (de) | 1999-04-14 |
EP0908278A3 EP0908278A3 (de) | 1999-09-15 |
EP0908278B1 EP0908278B1 (de) | 2003-03-19 |
Family
ID=7844569
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98114058A Expired - Lifetime EP0908278B1 (de) | 1997-10-04 | 1998-07-28 | Verfahren zur Bestimmung der Menge des von einem elektrisch angetriebenen Schneidwerkzeug geschnittenen Schneidguts und Haarschneidegerät mit Schaltungsanordnung zur Durchführung des Verfahrens |
Country Status (11)
Country | Link |
---|---|
US (1) | US6072399A (de) |
EP (1) | EP0908278B1 (de) |
JP (1) | JP4141546B2 (de) |
KR (1) | KR100582874B1 (de) |
CN (1) | CN1280072C (de) |
AT (1) | ATE234709T1 (de) |
DE (2) | DE19743853C1 (de) |
DK (1) | DK0908278T3 (de) |
ES (1) | ES2196434T3 (de) |
HK (1) | HK1017302A1 (de) |
RU (1) | RU2214906C2 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9114542B2 (en) | 2006-08-14 | 2015-08-25 | Braun Gmbh | Determining degree of dirtiness of electrically driven cutting tools |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8627573B2 (en) * | 2002-10-05 | 2014-01-14 | Braun Gmbh | Hair-removing device |
EP1952956A1 (de) | 2007-02-02 | 2008-08-06 | Müller Martini Holding AG | Vorrichtung zum Schneiden eines aus Druckprodukten gebildeten Schuppenstroms |
CN106457582B (zh) * | 2014-06-20 | 2019-02-26 | 皇家飞利浦有限公司 | 具有清洁指示器的电动剃须刀 |
US10946539B2 (en) | 2016-12-01 | 2021-03-16 | Koninklijke Philips N.V. | Hair cutting apparatus comprising a light indicator |
BR112019011030A2 (pt) * | 2016-12-01 | 2019-10-15 | Koninklijke Philips Nv | aparelho para corte de pelos e método para detectar uma ação de corte de um aparelho para corte de cabelos |
CN109895147B (zh) * | 2019-03-08 | 2021-05-11 | 美国华尔推剪公司 | 电推剪转速控制装置及其控制方法 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02241480A (ja) | 1989-03-15 | 1990-09-26 | Kyushu Hitachi Maxell Ltd | 電気機器 |
US5111580A (en) | 1989-12-14 | 1992-05-12 | U.S. Philips Corp. | Electric shaving apparatus |
DE19606719A1 (de) | 1996-02-23 | 1997-08-28 | Braun Ag | Verfahren zur Bestimmung der Verschmutzung eines Rasierapparates sowie Vorrichtung zur Durchführung des Verfahrens |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3846688A (en) * | 1973-07-18 | 1974-11-05 | Electron Inc | Machine work sensor |
DE2517001A1 (de) * | 1975-04-17 | 1976-10-21 | Buderus Eisenwerk | Verfahren und vorrichtung zur regelung des vorschubs einer schleifscheibe |
DE2658477A1 (de) * | 1976-12-23 | 1978-06-29 | Teldix Gmbh | Vorrichtung zur ueberwachung von ungleichmaessigkeiten und/oder strukturaenderungen des fadens einer oe-spinnturbine |
DE2755647A1 (de) * | 1977-12-14 | 1979-06-28 | Teldix Gmbh | Vorrichtung zur ueberwachung des fadens einer oe-spinnturbine |
JPH04314487A (ja) * | 1991-04-15 | 1992-11-05 | Matsushita Electric Works Ltd | 電気かみそり |
US5274735A (en) * | 1991-12-16 | 1993-12-28 | Sanyo Electric Co., Ltd. | Electric shaver |
AT403958B (de) * | 1992-02-17 | 1998-07-27 | Payer Lux Elektroprod | Elektrischer rasierapparat |
DE19534464C1 (de) * | 1995-09-16 | 1996-12-05 | Rowenta Werke Gmbh | Vorrichtung zur Verhinderung des Trockenlaufens bei elektromagnetischen Schwingkolbenpumpen |
-
1997
- 1997-10-04 DE DE19743853A patent/DE19743853C1/de not_active Expired - Fee Related
-
1998
- 1998-07-28 DE DE59807528T patent/DE59807528D1/de not_active Expired - Lifetime
- 1998-07-28 DK DK98114058T patent/DK0908278T3/da active
- 1998-07-28 ES ES98114058T patent/ES2196434T3/es not_active Expired - Lifetime
- 1998-07-28 EP EP98114058A patent/EP0908278B1/de not_active Expired - Lifetime
- 1998-07-28 AT AT98114058T patent/ATE234709T1/de not_active IP Right Cessation
- 1998-08-06 US US09/130,163 patent/US6072399A/en not_active Expired - Lifetime
- 1998-09-07 CN CNB98117681XA patent/CN1280072C/zh not_active Expired - Fee Related
- 1998-09-14 KR KR1019980037744A patent/KR100582874B1/ko not_active IP Right Cessation
- 1998-10-02 RU RU98118497/12A patent/RU2214906C2/ru not_active IP Right Cessation
- 1998-10-02 JP JP28145198A patent/JP4141546B2/ja not_active Expired - Fee Related
-
1999
- 1999-05-27 HK HK99102380A patent/HK1017302A1/xx not_active IP Right Cessation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02241480A (ja) | 1989-03-15 | 1990-09-26 | Kyushu Hitachi Maxell Ltd | 電気機器 |
US5111580A (en) | 1989-12-14 | 1992-05-12 | U.S. Philips Corp. | Electric shaving apparatus |
DE19606719A1 (de) | 1996-02-23 | 1997-08-28 | Braun Ag | Verfahren zur Bestimmung der Verschmutzung eines Rasierapparates sowie Vorrichtung zur Durchführung des Verfahrens |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9114542B2 (en) | 2006-08-14 | 2015-08-25 | Braun Gmbh | Determining degree of dirtiness of electrically driven cutting tools |
Also Published As
Publication number | Publication date |
---|---|
EP0908278B1 (de) | 2003-03-19 |
EP0908278A3 (de) | 1999-09-15 |
HK1017302A1 (en) | 1999-11-19 |
KR100582874B1 (ko) | 2006-09-27 |
RU2214906C2 (ru) | 2003-10-27 |
ES2196434T3 (es) | 2003-12-16 |
CN1280072C (zh) | 2006-10-18 |
KR19990036630A (ko) | 1999-05-25 |
JP4141546B2 (ja) | 2008-08-27 |
ATE234709T1 (de) | 2003-04-15 |
CN1213600A (zh) | 1999-04-14 |
DE19743853C1 (de) | 1998-11-26 |
JPH11165298A (ja) | 1999-06-22 |
DK0908278T3 (da) | 2003-06-23 |
DE59807528D1 (de) | 2003-04-24 |
US6072399A (en) | 2000-06-06 |
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