EP0908278B1 - Verfahren zur Bestimmung der Menge des von einem elektrisch angetriebenen Schneidwerkzeug geschnittenen Schneidguts und Haarschneidegerät mit Schaltungsanordnung zur Durchführung des Verfahrens - Google Patents

Verfahren zur Bestimmung der Menge des von einem elektrisch angetriebenen Schneidwerkzeug geschnittenen Schneidguts und Haarschneidegerät mit Schaltungsanordnung zur Durchführung des Verfahrens Download PDF

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Publication number
EP0908278B1
EP0908278B1 EP98114058A EP98114058A EP0908278B1 EP 0908278 B1 EP0908278 B1 EP 0908278B1 EP 98114058 A EP98114058 A EP 98114058A EP 98114058 A EP98114058 A EP 98114058A EP 0908278 B1 EP0908278 B1 EP 0908278B1
Authority
EP
European Patent Office
Prior art keywords
pulses
cutting tool
pass filter
fluctuations
hair cutting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP98114058A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0908278A2 (de
EP0908278A3 (de
Inventor
Jochen Cimbal
Günther Bergk
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Braun GmbH
Original Assignee
Braun GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Braun GmbH filed Critical Braun GmbH
Publication of EP0908278A2 publication Critical patent/EP0908278A2/de
Publication of EP0908278A3 publication Critical patent/EP0908278A3/de
Application granted granted Critical
Publication of EP0908278B1 publication Critical patent/EP0908278B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 Hair clipper with a circuit arrangement for performing the method.
  • the method according to the invention is suitable for cutting tools with which material to be cut is cut in a plurality of individual cutting operations, and in particular intended for those whose function is cut after a certain period of operation Cuttings are affected. This method is preferred for example to measure and display the degree of pollution of an electrical 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 of 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 shaver without a contamination indicator the design effort is considerable.
  • a shaver with a clogging indicator is known, in which a measurement of the current drawn by the razor motor by a Microcomputer is done, which is either proportional to the current or current peaks Voltage values are supplied in digital form. Because of the A / D conversion either the current magnitude of the current within the sampling intervals (Fig. 1 of US 5,274,735) or the peak value of the current within the intervals (FIG. 2 of US 5,274,735) measured, which of course differ from interval to interval can, i.e. the measured current generally undergoes certain fluctuations subject. However, it is not known from US Pat. No.
  • 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 device that the user on the Informed need for cleaning.
  • 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, of the fluctuations detected, all those 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 certain amount 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 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 on / off switchable DC motor M via a switch S1 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 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.
  • 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 a switch S2, for example, which switches on in a manner known per se Shaving head is arranged, so that when the shaving head is removed, the reset 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 fixed 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)
  • Machine Tool Sensing Apparatuses (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Sampling And Sample Adjustment (AREA)
EP98114058A 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 Expired - Lifetime EP0908278B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
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
DE19743853 1997-10-04

Publications (3)

Publication Number Publication Date
EP0908278A2 EP0908278A2 (de) 1999-04-14
EP0908278A3 EP0908278A3 (de) 1999-09-15
EP0908278B1 true 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 (xx)
EP (1) EP0908278B1 (xx)
JP (1) JP4141546B2 (xx)
KR (1) KR100582874B1 (xx)
CN (1) CN1280072C (xx)
AT (1) ATE234709T1 (xx)
DE (2) DE19743853C1 (xx)
DK (1) DK0908278T3 (xx)
ES (1) ES2196434T3 (xx)
HK (1) HK1017302A1 (xx)
RU (1) RU2214906C2 (xx)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8627573B2 (en) * 2002-10-05 2014-01-14 Braun Gmbh Hair-removing device
DE102006038126A1 (de) 2006-08-14 2008-02-21 Braun Gmbh Verfahren zur Bestimmung der Verschmutzung eines elektrisch angetriebenen Schneidwerkzeugs und Haarschneidegerät
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
EP3548231B1 (en) * 2016-12-01 2021-01-20 Koninklijke Philips N.V. Hair cutting apparatus comprising a current detector
CN110023047B (zh) 2016-12-01 2021-09-03 皇家飞利浦有限公司 包括光指示器的毛发切割装置
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 (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19534464C1 (de) * 1995-09-16 1996-12-05 Rowenta Werke Gmbh Vorrichtung zur Verhinderung des Trockenlaufens bei elektromagnetischen Schwingkolbenpumpen

Family Cites Families (10)

* Cited by examiner, † Cited by third party
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
JP2936139B2 (ja) * 1989-03-15 1999-08-23 九州日立マクセル株式会社 電気機器
NL8903065A (nl) * 1989-12-14 1991-07-01 Philips Nv Elektrisch scheerapparaat.
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
DE19606719C2 (de) * 1996-02-23 1997-12-11 Braun Ag Verfahren zur Bestimmung der Verschmutzung eines Rasierapparates sowie Vorrichtung zur Durchführung des Verfahrens

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19534464C1 (de) * 1995-09-16 1996-12-05 Rowenta Werke Gmbh Vorrichtung zur Verhinderung des Trockenlaufens bei elektromagnetischen Schwingkolbenpumpen

Also Published As

Publication number Publication date
EP0908278A2 (de) 1999-04-14
EP0908278A3 (de) 1999-09-15
CN1280072C (zh) 2006-10-18
RU2214906C2 (ru) 2003-10-27
KR19990036630A (ko) 1999-05-25
DE59807528D1 (de) 2003-04-24
ATE234709T1 (de) 2003-04-15
DE19743853C1 (de) 1998-11-26
ES2196434T3 (es) 2003-12-16
HK1017302A1 (en) 1999-11-19
JPH11165298A (ja) 1999-06-22
US6072399A (en) 2000-06-06
DK0908278T3 (da) 2003-06-23
KR100582874B1 (ko) 2006-09-27
JP4141546B2 (ja) 2008-08-27
CN1213600A (zh) 1999-04-14

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