EP0349077A2 - Small domestic apparatus for cutting body hair - Google Patents

Small domestic apparatus for cutting body hair Download PDF

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Publication number
EP0349077A2
EP0349077A2 EP89201678A EP89201678A EP0349077A2 EP 0349077 A2 EP0349077 A2 EP 0349077A2 EP 89201678 A EP89201678 A EP 89201678A EP 89201678 A EP89201678 A EP 89201678A EP 0349077 A2 EP0349077 A2 EP 0349077A2
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EP
European Patent Office
Prior art keywords
permanent magnet
coils
stator
movement
lower knife
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.)
Withdrawn
Application number
EP89201678A
Other languages
German (de)
French (fr)
Other versions
EP0349077A3 (en
Inventor
Leo Bertram
Hugo Dr. Schemmann
Romuald Leander Bukoschek
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.)
Philips Intellectual Property and Standards GmbH
Koninklijke Philips NV
Original Assignee
Philips Patentverwaltung GmbH
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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Filing date
Publication date
Application filed by Philips Patentverwaltung GmbH, Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Patentverwaltung GmbH
Publication of EP0349077A2 publication Critical patent/EP0349077A2/en
Publication of EP0349077A3 publication Critical patent/EP0349077A3/en
Withdrawn legal-status Critical Current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
    • B26B19/28—Drive layout for hair clippers or dry shavers, e.g. providing for electromotive drive
    • B26B19/282—Motors without a rotating central drive shaft, e.g. linear motors

Definitions

  • the invention relates to a small household vibration device for cutting off body hair, in particular a dry shaving device, with a lower knife which can be moved longitudinally by an electric drive device and which performs vibratory movements in contact with a fixed upper knife, the upper knife being provided with hair passage openings and the drive device being provided by means of coils Has excitable stator arrangement which moves a bipolar magnetized permanent magnet which transmits its movement to the lower knife.
  • Such a household vibration device is known from DE-OS 20 32 520.
  • the drive device consists of a stator with U-shaped stator iron and coils pushed onto the legs of the stator iron.
  • a rotor rotatably mounted between the stator poles has a two-pole magnetized permanent magnet and iron rotor poles that interact with the stator iron poles.
  • the rotor also has an eccentric pin on which a first arm of a double-armed lever engages. The second arm of the double-armed lever acts on the linearly movable lower knife. This construction is complex and very elongated.
  • the permanent magnet is mounted such that it can be moved back and forth in the direction of movement of the lower knife between stator poles acting on its end regions, -
  • the permanent magnet is guided into such a rest position by means of spring forces in the space of the stator field that it executes oscillating movements from this rest position when the stator coils are excited.
  • the height of the device can be shortened with a longitudinally displaceable permanent magnet. This is particularly advantageous for a small device in your luggage.
  • the permanent magnet is rigidly coupled to the lower knife in the direction of movement.
  • This rigid coupling proves to be particularly advantageous if it is provided in a further embodiment of the invention that the permanent magnet is attached directly to the underside of the lower knife and a partition is provided between it and the stator poles. The construction is extremely short.
  • stator poles in the direction of movement of the coaxially magnetized permanent magnet lie on the outside of its axial pole end faces.
  • stator poles are laterally opposite the axially magnetized permanent magnet in the direction of movement, forming a mutual center distance.
  • the coils are excited by means of a current, the frequency of which is not equal to the mains frequency (50 Hz, 60 Hz).
  • the vibration frequency of the motor can thus be set in a range that is favorable for the function of the device.
  • the coils are controlled by means of current pulses.
  • the control by means of pulses in particular battery operation of the device can advantageously be realized.
  • the coils are controlled by means of current pulses of one polarity. It can get by with fewer electronic switching elements.
  • the coils are controlled by means of an alternating voltage rectified in the two-way direction.
  • a double-way rectified AC voltage makes it easy to double the frequency of the rotor vibration when controlled by AC voltage.
  • Fig. 1 shows a small electrical household appliance, which is particularly suitable as an electric shaver.
  • a housing 1 there is a mounting plate 3 on which a single-phase synchronous motor 4 is arranged.
  • the single-phase synchronous motor 4 has a U-shaped stator iron 5 with two legs 5a and 5b. Excitation coils 6 connected in series are pushed onto the parallel legs 5a and 5b.
  • a rod-shaped permanent magnet 35 which is magnetized in its axial direction of movement (arrow line 35a) is arranged to be longitudinally movable in a guide 36 of a stator 5 and has axial pole end faces 35b.
  • the stator 5 has stator poles 7 'which are narrowed towards the outside 37 of the legs 5a, 5b and have the parallel pole faces 38 which correspond to the axial pole end faces 35b on the outside.
  • the stator poles 7 ' are provided at their free ends by means of magnetically non-conductive, well sliding guide rails 39.
  • the same purpose also serve wedge-shaped inserts 39a in the transition of the stator legs 5a, 5b to the stator poles 7 '.
  • the rod-shaped permanent magnet 35 which is preferably provided with a plastic sheathing 40, is arranged in the guides 36 formed in this way.
  • the rod-shaped permanent magnet 35 is held in a rest position by means of compression springs 23 ', which are supported between counter bearings 33' and gating 41 on the casing 40. Because of its axial magnetization running in the direction of arrow 35a, the permanent magnet is inclined to magnetically approach the stator poles 7 '.
  • the compression springs 23 ' must be made correspondingly stronger to keep the rod-shaped permanent magnet 35 in a middle rest position.
  • the sheath 40 of the rod-shaped permanent magnet is provided with a lever 12a, which has a driver head 14 at its free end 15, which is gripped by claws 19 of a lower knife 20 of a dry shaving device, which is movable under a fixed upper knife 20a.
  • the lower knife 20 is mounted by means of bearings 21 in such a way that it can carry out vibrating movements to and fro in the direction of a double arrow 22.
  • Fig. 2 shows a simplification of the device of FIG. 1.
  • the stator poles 7 ⁇ of the U-shaped stator iron 5 lie in forming a mutual distance
  • the oscillation frequency of the lower knife depends on the frequency of the motor control.
  • One way of electronic control is a two-way rectification, which is shown in Fig. 3.
  • An AC mains voltage with a frequency of 50 Hz or 60 Hz is applied to the terminals 110.
  • a full-wave rectifier 111 rectifies the AC mains voltage and forms a DC voltage of twice the mains frequency, ie 100 Hz or 120 Hz, indicated by the symbol 112, which is applied to the stator coils 5a, 5b.
  • the oscillation frequency is doubled in this way.

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  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Dry Shavers And Clippers (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)

Abstract

The invention relates to a small domestic apparatus for cutting body hair, in particular a dry shaver, having a lower blade (20) which is longitudinally movable by means of an electric drive mechanism and performs vibratory movements in contact with a fixed upper blade (20a), the upper blade (20a) being provided with hair passage openings and the drive mechanism having a stator arrangement which is excitable by means of coils (6) and moves a bipolar-magnetised permanent magnet (35) which imparts the movements to the lower blade (20). When the stator coils (6) are switched off, the permanent magnet (35) is guided in the space of the stator field by means of spring forces into such a rest position that it performs oscillating movements about this rest position when the stator coils (6) are excited. Furthermore, the permanent magnet (35) is guided so as to be displaceable to and fro in the direction of movement of the lower blade (20). <IMAGE>

Description

Die Erfindung bezieht sich auf ein kleines Haushalts­vibrationsgerät zum Abschneiden von Körperhaaren, insbesondere ein Trockenrasiergerät, mit einem von einer elektrischen Antriebsvorrichtung längsbewegbaren Unter­messer, das in Berührung mit einem feststehenden Ober­messer Vibrationsbewegungen ausführt, wobei das Obermesser mit Haardurchtrittsöffnungen versehen ist und wobei die Antriebsvorrichtung eine mittels Spulen erregbare Stator­anordnung aufweist, die einen zweipolig magnetisierten Permanentmagneten bewegt, der seine Bewegung auf das Untermesser überträgt.The invention relates to a small household vibration device for cutting off body hair, in particular a dry shaving device, with a lower knife which can be moved longitudinally by an electric drive device and which performs vibratory movements in contact with a fixed upper knife, the upper knife being provided with hair passage openings and the drive device being provided by means of coils Has excitable stator arrangement which moves a bipolar magnetized permanent magnet which transmits its movement to the lower knife.

Ein derartiges Haushaltsvibrationsgerät ist aus der DE-OS 20 32 520 bekannt. Die Antriebsvorrichtung besteht aus einem Stator mit U-förmigen Statoreisen und auf die Schenkel der Statoreisen geschobenen Spulen. Ein zwischen den Statorpolen drehbar gelagerter Rotor hat einen zwei­polig magnetisierten Dauermagneten und eiserne Rotorpole, die mit den Statoreisenpolen zusammenwirken. Der Rotor hat weiterhin einen exzentrischen Zapfen, an dem ein erster Arm eines doppelarmigen Hebels angreift. Der zweite Arm des doppelarmigen Hebels wirkt auf das linear bewegliche Untermesser ein. Diese Konstruktion ist aufwendig und sehr langgestreckt.Such a household vibration device is known from DE-OS 20 32 520. The drive device consists of a stator with U-shaped stator iron and coils pushed onto the legs of the stator iron. A rotor rotatably mounted between the stator poles has a two-pole magnetized permanent magnet and iron rotor poles that interact with the stator iron poles. The rotor also has an eccentric pin on which a first arm of a double-armed lever engages. The second arm of the double-armed lever acts on the linearly movable lower knife. This construction is complex and very elongated.

Es ist Aufgabe der Erfindung, ein Haushaltsvibrationsgerät der eingangs erwähnten Art zu schaffen, bei dem eine Linearbewegung des Untermessers ohne Verwendung eines Drehschwingungen ausführenden Antriebes erzeugt wird.It is an object of the invention to provide a household vibration device of the type mentioned in the introduction, in which a linear movement of the lower knife is generated without using a drive which executes torsional vibrations.

Die gestellte Aufgabe ist erfindungsgemäß dadurch gelöst, daß
- der Permanentmagnet in der Bewegungsrichtung des Unter­messers hin und her verschieblich gelagert ist zwischen auf seine Endbereiche einwirkenden Statorpolen,
- der Permanentmagnet bei abgeschalteten Statorspulen im Raum des Statorfeldes mittels Federkräften in eine derartige Ruhelage geführt wird, daß er bei erregten Statorspulen von dieser Ruhelage aus Schwingbewegungen ausführt.The object is achieved in that
the permanent magnet is mounted such that it can be moved back and forth in the direction of movement of the lower knife between stator poles acting on its end regions,
- When the stator coils are switched off, the permanent magnet is guided into such a rest position by means of spring forces in the space of the stator field that it executes oscillating movements from this rest position when the stator coils are excited.

Mit einem längsverschieblichen Permanentmagneten läßt sich die Höhe des Gerätes verkürzen. Dies ist besonders vorteilhaft für ein kleines Gerät im Reisegepäck.The height of the device can be shortened with a longitudinally displaceable permanent magnet. This is particularly advantageous for a small device in your luggage.

Nach einer weiteren Ausgestaltung der Erfindung ist vorge­sehen, daß der Permanentmagnet in der Bewegungsrichtung starr mit dem Untermesser gekoppelt ist. Diese starre Kopplung erweist sich als besonders vorteilhaft, wenn in weiterer Ausgestaltung der Erfindung vorgesehen ist, daß der Permanentmagnet unmittelbar an der Unterseite des Untermessers befestigt und zwischen ihm und den Stator­polen eine Trennwand vorgesehen ist. Die Bauweise ist dabei extrem kurz.According to a further embodiment of the invention it is provided that the permanent magnet is rigidly coupled to the lower knife in the direction of movement. This rigid coupling proves to be particularly advantageous if it is provided in a further embodiment of the invention that the permanent magnet is attached directly to the underside of the lower knife and a partition is provided between it and the stator poles. The construction is extremely short.

Nach einer weiteren Ausgestaltung der Erfindung ist vorge­sehen, daß auf den Permanentmagneten bzw. eine Verbindung zum Untermesser in entgegengesetzen Richtungen Druckfedern einwirken, die den Permanentmagneten bei ausgeschalteten Spulen in seine Ruhelage drängen, und daß der Permanent­magnet bei eingeschalteten Spulen in der Bewegungsrichtung des Untermessers lineare Schwingbewegungen von seiner Ruhelage aus ausführt.According to a further embodiment of the invention it is provided that on the permanent magnet or a connection act on the lower knife in opposite directions compression springs which urge the permanent magnet to its rest position when the coils are switched off, and that the permanent magnet carries out linear oscillating movements from its rest position in the direction of movement of the lower knife when the coils are switched on.

Nach einer weiteren Ausgestaltung der Erfindung ist vorge­sehen, daß die Statorpole in Bewegungsrichtung des koaxial magnetisierten Permanentmagneten dessen axialen Pol­endflächen außenseitig gegenüberliegen. Eine andere Ausführungsform ist dadurch gekennzeichnet, daß die Statorpole dem axial magnetisierten Permanentmagneten in Bewegungsrichtung unter Ausbildung eines gegenseitigen Mittelabstandes seitlichen gegenüberliegen.According to a further embodiment of the invention, it is provided that the stator poles in the direction of movement of the coaxially magnetized permanent magnet lie on the outside of its axial pole end faces. Another embodiment is characterized in that the stator poles are laterally opposite the axially magnetized permanent magnet in the direction of movement, forming a mutual center distance.

Nach einer weiteren Ausgestaltung der Erfindung ist vorge­sehen, daß die Spulen mittels eines Stromes erregt werden, dessen Frequenz ungleich der Netzfrequenz (50 Hz, 60 Hz) ist. Damit kann die Schwingfrequenz des Motors in einen für die Funktion des Gerätes günstigen Bereich gelegt werden.According to a further embodiment of the invention, it is provided that the coils are excited by means of a current, the frequency of which is not equal to the mains frequency (50 Hz, 60 Hz). The vibration frequency of the motor can thus be set in a range that is favorable for the function of the device.

Nach einer weiteren Ausgestaltung der Erfindung ist vorge­sehen, daß die Spulen mittels Stromimpulsen angesteuert werden. Durch die Ansteuerung mittels Impulsen läßt sich insbesondere ein Batteriebetrieb des Gerätes vorteilhaft realisieren.According to a further embodiment of the invention, it is provided that the coils are controlled by means of current pulses. By means of the control by means of pulses, in particular battery operation of the device can advantageously be realized.

Nach einer weiteren Ausgestaltung der Erfindung ist vorge­sehen, daß die Spulen mittels Stromimpulsen einer Polari­tät angesteuert werden. Dabei läßt sich mit weniger elek­tronischen Schaltelementen auskommen.According to a further embodiment of the invention, it is provided that the coils are controlled by means of current pulses of one polarity. It can get by with fewer electronic switching elements.

Nach einer weiteren Ausgetaltung der Erfindung ist vorge­sehen, daß die Spulen mittels einer doppelweg-gleich­gerichteten Wechselspannung angesteuert werden. Durch eine doppelweg-gleichgerichtete Wechselspannung kommt man auf einfache Art zu einer Frequenzverdoppelung der Rotor­schwingung bei Ansteuerung mit Wechselspannung.According to a further embodiment of the invention, it is provided that the coils are controlled by means of an alternating voltage rectified in the two-way direction. A double-way rectified AC voltage makes it easy to double the frequency of the rotor vibration when controlled by AC voltage.

Die Erfindung wird anhand der Zeichnungen näher erläutert. Es zeigen:

  • Fig. 1 und 2 verschiedene eine Statoranordnungen einer Antriebsvorrichtung eines Trockenrasierapparataes mit einem längsbeweglichen permanentmagnetischen Antriebsteil,
  • Fig. 3 ein Schaltbild einer einfachen elektronisch realisierten Frequenzverdoppelung.
The invention is explained in more detail with reference to the drawings. Show it:
  • 1 and 2 different a stator arrangements of a drive device of a dry shaver with a longitudinally movable permanent magnetic drive part,
  • Fig. 3 is a circuit diagram of a simple electronically implemented frequency doubling.

Fig. 1 zeigt ein kleines elektrisches Haushaltsgerät, das sich insbesondere als elektrisches Rasiergerät eignet. In einem Gehäuse 1 befindet sich eine Montageplatte 3, auf der ein Einphasensynchronmotor 4 angeordnet ist. Der Einphasensynchronmotor 4 weist ein U-förmiges Statoreisen 5 mit zwei Schenkeln 5a und 5b auf. Auf die parallel zueinander verlaufenden Schenkel 5a und 5b sind in Reihe geschaltete Erregerspulen 6 aufgeschoben. Ein in seiner axialen Bewegungsrichtung (Pfeillinie 35a) magnetisierter stabförmiger Permanentmagnet 35 ist längsbeweglich in einer Führung 36 eines Stators 5 angeordnet und hat axiale Polendflächen 35b.Fig. 1 shows a small electrical household appliance, which is particularly suitable as an electric shaver. In a housing 1 there is a mounting plate 3 on which a single-phase synchronous motor 4 is arranged. The single-phase synchronous motor 4 has a U-shaped stator iron 5 with two legs 5a and 5b. Excitation coils 6 connected in series are pushed onto the parallel legs 5a and 5b. A rod-shaped permanent magnet 35 which is magnetized in its axial direction of movement (arrow line 35a) is arranged to be longitudinally movable in a guide 36 of a stator 5 and has axial pole end faces 35b.

Der Stator 5 hat Statorpole 7′, die zur Außenseite 37 der Schenkel 5a, 5b hin verschmälert sind und die parallele Polflächen 38 aufweisen, die den axialen Polendflächen 35b außenseitig gegenüberliegen. Zur Ausbildung der mecha­nischen Führungen sind die Statorpole 7′ an ihren freien Enden mittels magnetisch nicht-leitender, gut gleitender Führungsschienen 39 versehen. Demselben Zweck dienen auch keilförmige Einsätze 39a im Übergang der Statorschenkel 5a, 5b zu den Statorpolen 7′. In den auf diese Weise gebildeten Führungen 36 ist der stabförmige Dauermagnet 35 angeordnet, der vorzugsweise mit einer Kunststoff-­Ummantelung 40 versehen ist.The stator 5 has stator poles 7 'which are narrowed towards the outside 37 of the legs 5a, 5b and have the parallel pole faces 38 which correspond to the axial pole end faces 35b on the outside. To form the mechanical guides, the stator poles 7 'are provided at their free ends by means of magnetically non-conductive, well sliding guide rails 39. The same purpose also serve wedge-shaped inserts 39a in the transition of the stator legs 5a, 5b to the stator poles 7 '. The rod-shaped permanent magnet 35, which is preferably provided with a plastic sheathing 40, is arranged in the guides 36 formed in this way.

Der stabförmige Permanentmagnet 35 wird mittels Druck­federn 23′, die sich zwischen Gegenlagern 33′ und Anspritzungen 41 an der Ummantelung 40 abstützen, in einer Ruhelage gehalten. Wegen seiner in Richtung des Pfeiles 35a verlaufenden axialen Magnetisierung ist der Permanentmagnet geneigt, sich an die Statorpole 7′ magnetisch anzunähern. Die Druckfedern 23′ müssen entsprechend stärker ausgebildet sein, um den stabförmigen Permanentmagneten 35 in einer mittleren Ruhelage zu halten.The rod-shaped permanent magnet 35 is held in a rest position by means of compression springs 23 ', which are supported between counter bearings 33' and gating 41 on the casing 40. Because of its axial magnetization running in the direction of arrow 35a, the permanent magnet is inclined to magnetically approach the stator poles 7 '. The compression springs 23 'must be made correspondingly stronger to keep the rod-shaped permanent magnet 35 in a middle rest position.

Die Ummantelung 40 des stabförmigen Dauermagneten ist mit einem Hebel 12a versehen, der an seinem freien Ende 15 einen Mitnehmerkopf 14 aufweist, der von Klauen 19 eines Untermessers 20 eines Trockenrasiergerätes umgriffen wird, das unter einem feststehenden Obermesser 20a beweglich ist. Das Untermesser 20 ist mittels Lagern 21 derart gelagert, daß es in Richtung eines Doppelpfeiles 22 hin und her gehende Vibrationsbewegungen ausführen kann.The sheath 40 of the rod-shaped permanent magnet is provided with a lever 12a, which has a driver head 14 at its free end 15, which is gripped by claws 19 of a lower knife 20 of a dry shaving device, which is movable under a fixed upper knife 20a. The lower knife 20 is mounted by means of bearings 21 in such a way that it can carry out vibrating movements to and fro in the direction of a double arrow 22.

Fig. 2 zeigt eine Vereinfachung des Gerätes nach Fig. 1. Die Statorpole 7˝ des U-förmigen Statoreisens 5 liegen unter Ausbildung eines gegenseitigen Abstandes inFig. 2 shows a simplification of the device of FIG. 1. The stator poles 7˝ of the U-shaped stator iron 5 lie in forming a mutual distance

Bewegungsrichtung des Permanentmagneten und in einer Ebene nebeneinander und sind mittels einer Gehäuse-Trennwand 42 abgedeckt. Das Untermesser 20 an seiner Unterseite trägt den stabförmigen Dauermagneten 35. Die Wirkung der Druck­federn 23′ wird übernommen von den auf das Untermesser 20 einwirkenden Druckfedern 23˝ des Scherkopfes. Die Arbeits­weise des Gerätes nach Fig. 2 entspricht der des Gerätes nach Fig. 1. Bei beiden Ausführungsformen wirken die Statorpole 7, 7˝ auf die axialen Endbereiche des Permanentmagneten 35 ein. Bei Fig. 1 erfolgt die Wirkung in axialer Richtung; bei Fig. 2 erfolgt die Wirkung seitlich von der Trennwand 42 her.Direction of movement of the permanent magnet and in a plane next to each other and are covered by a housing partition 42. The lower knife 20 on its underside carries the rod-shaped permanent magnet 35. The effect of the compression springs 23 'is taken over by the pressure springs 23' acting on the lower knife 20 'of the shaving head. The operation of the device according to FIG. 2 corresponds to that of the device according to FIG. 1. In both embodiments, the stator poles 7, 7, act on the axial end regions of the permanent magnet 35. In Fig. 1, the effect takes place in the axial direction; 2, the effect is from the side of the partition 42.

Die Schwingfrequenz des Untermessers richtet sich nach der Frequenz der Motoransteuerung. Eine Möglichkeit der elek­tronischen Ansteuerung bildet dabei eine Doppelweg-Gleich­richtung, die in Fig. 3 dargestellt ist. An die Klemmen 110 wird eine Netzwechselspannung mit einer Frequenz von 50 Hz oder 60 Hz gelegt. Ein Doppelweg-Gleichrichter 111 richtet die Netzwechselspannung gleich und bildet eine durch das Zeichen 112 angedeutete Gleichspannung von doppelter Netzfrequenz, also 100 Hz oder 120 Hz, die an die Statorspulen 5a, 5b angelegt ist. Die Schwingfrequenz wird auf diese Weise verdoppelt.The oscillation frequency of the lower knife depends on the frequency of the motor control. One way of electronic control is a two-way rectification, which is shown in Fig. 3. An AC mains voltage with a frequency of 50 Hz or 60 Hz is applied to the terminals 110. A full-wave rectifier 111 rectifies the AC mains voltage and forms a DC voltage of twice the mains frequency, ie 100 Hz or 120 Hz, indicated by the symbol 112, which is applied to the stator coils 5a, 5b. The oscillation frequency is doubled in this way.

Claims (11)

1. Kleines Haushaltsvibrationsgerät zum Abschneiden von Körperhaaren, insbesondere Trockenrasiergerät, mit einem von einer elektrischen Antriebsvorrichtung längsbewegbaren Untermesser (20), das in Berührung mit einem feststehenden Obermesser (20a) Vibrationsbewegungen ausführt, wobei das Obermesser (20a) mit Haardurchtrittsöffnungen versehen ist und wobei die Antriebsvorrichtung eine mittels Spulen (6) erregbare Statoranordnung aufweist, die einen zwei­polig magnetisierten Permanentmagneten (35) bewegt, der seine Bewegung auf das Untermesser (20) überträgt, dadurch gekennzeichnet, daß
- der Permanentmagnet (35) in der Bewegungsrichtung des Untermessers (20) hin und her verschieblich gelagert ist zwischen auf seine Endbereiche einwirkenden Statorpolen (7′, 7˝),
- der Permanentmagnet (9, 35) bei abgeschalteten Stator­spulen (6) im Raum des Statorfeldes mittels Federkräften in eine derartige Ruhelage geführt wird, daß er bei erregten Statorspulen (6) von dieser Ruhelage aus Schwingbewegungen ausführt.1. Small household vibration device for cutting off body hair, in particular a dry shaving device, with a lower knife (20) which can be moved longitudinally by an electric drive device and which performs vibratory movements in contact with a fixed upper knife (20a), the upper knife (20a) being provided with hair passage openings and the Drive device has a stator arrangement which can be excited by coils (6) and which moves a two-pole magnetized permanent magnet (35) which transmits its movement to the lower knife (20), characterized in that
- The permanent magnet (35) in the direction of movement of the lower knife (20) is displaceably mounted back and forth between acting on its end regions stator poles (7 ', 7˝),
- The permanent magnet (9, 35) with switched off stator coils (6) in the space of the stator field is guided by spring forces into such a rest position that it performs oscillating movements from this rest position when the stator coils (6) are excited. 2. Gerät nach Anspruch 1, dadurch gekennzeichnet, daß der Permanentmagnet (35) in der Bewegungsrichtung starr mit dem Untermesser (20) gekoppelt ist (Fig. 3a).2. Apparatus according to claim 1, characterized in that the permanent magnet (35) is rigidly coupled in the direction of movement with the lower knife (20) (Fig. 3a). 3. Gerät nach Anspruch 1, dadurch gekennzeichnet, daß der Permanentmagnet (35) unmittelbar an der Unterseite des Untermessers (20) befestigt und zwischen ihm und den Statorpolen eine Trennwand (42) vorgesehen ist.3. Apparatus according to claim 1, characterized in that the permanent magnet (35) is attached directly to the underside of the lower knife (20) and a partition (42) is provided between it and the stator poles. 4. Gerät nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß auf den Permanentmagneten (35) bzw. eine Verbindung zum Untermesser in entgegengesetzten Richtungen Druck­federn einwirken, die den Permanentmagneten (35) bei ausgeschalteten Spulen (6) in seine Ruhelage drängen, und daß der Permanentmagnet (35) bei eingeschalteten Spulen in der Bewegungsrichtung des Untermessers lineare Schwing­bewegungen von seiner Ruhelage aus ausführt.4. Apparatus according to claim 1 or 2, characterized in that act on the permanent magnet (35) or a connection to the lower knife in opposite directions compression springs which urge the permanent magnet (35) when the coils (6) are switched off to its rest position, and that the permanent magnet (35) carries out linear oscillating movements in the direction of movement of the lower knife from its rest position when the coils are switched on. 5. Gerät nach Anspruch 1, dadurch gekennzeichnet, daß die Statorpole (7′) in Bewegungsrichtung des axial magnetisierten Permanentmagneten (35) dessen axialen Polendflächen (35a) außenseitig gegenüberliegen (Fig. 1).5. Apparatus according to claim 1, characterized in that the stator poles (7 ') in the direction of movement of the axially magnetized permanent magnet (35) whose axial end faces (35a) are on the outside (Fig. 1). 6. Gerät nach Anspruch 1, dadurch gekennzeichnet, daß die Statorpole (7˝) dem axial magnetisierten Permanentmagneten (35) in Bewegungsrichtung unter Ausbildung eines gegenseitigen Mittelabstandes seitlich gegenüberliegen (Fig. 2).6. Apparatus according to claim 1, characterized in that the stator poles (7˝) opposite the axially magnetized permanent magnet (35) in the direction of movement to form a mutual center distance laterally (Fig. 2). 7. Gerät nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Spulen (6) mittels eines Stromes erregt werden, dessen Frequenz ungleich der Netzfrequenz (50 Hz, 60 Hz) ist.7. Device according to one of claims 1 to 4, characterized in that the coils (6) are excited by means of a current whose frequency is not equal to the mains frequency (50 Hz, 60 Hz). 8. Gerät nach Anspruch 7, dadurch gekennzeichnet, daß die Spulen (6) mittels Stromimpulsen angesteuert werden.8. Apparatus according to claim 7, characterized in that the coils (6) are controlled by means of current pulses. 9. Gerät nach Anspruch 8, dadurch gekennzeichnet, daß die Spulen (6) mittels Stromimpulsen einer Polarität angesteuert werden.9. Apparatus according to claim 8, characterized in that the coils (6) are controlled by means of current pulses of one polarity. 10. Gerät nach Anspruch 7, dadurch gekennzeichnet, daß die Stromimpulse durch einen Bürsten-Schleifkontakt-­Impulsgeber angesteuert werden.10. Apparatus according to claim 7, characterized in that the current pulses are controlled by a brush sliding contact pulse generator. 11. Gerät nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Spulen (6) mit einer durch eine doppelweg-gleichgerichtete Wechselspannung angesteuert werden.11. Device according to one of claims 1 to 7, characterized in that the coils (6) are driven by an alternating voltage rectified by a double path.
EP19890201678 1988-07-01 1989-06-26 Small domestic apparatus for cutting body hair Withdrawn EP0349077A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19883822333 DE3822333A1 (en) 1988-07-01 1988-07-01 SMALL HOUSEHOLD VIBRATION DEVICE FOR CUTTING BODY HAIR
DE3822333 1988-07-01

Publications (2)

Publication Number Publication Date
EP0349077A2 true EP0349077A2 (en) 1990-01-03
EP0349077A3 EP0349077A3 (en) 1991-04-03

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Application Number Title Priority Date Filing Date
EP19890201678 Withdrawn EP0349077A3 (en) 1988-07-01 1989-06-26 Small domestic apparatus for cutting body hair

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EP (1) EP0349077A3 (en)
JP (1) JPH0252692A (en)
CN (1) CN1039375A (en)
DE (1) DE3822333A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0674979A1 (en) * 1994-03-28 1995-10-04 Matsushita Electric Works, Ltd. Reciprocatory dry shaver
DE19621598A1 (en) * 1995-05-31 1996-12-05 Matsushita Electric Works Ltd Linear vibrational motor e.g. for electric razor
US5955799A (en) * 1997-02-25 1999-09-21 Matsushita Electric Works, Ltd. Linear vibration motor and method for controlling vibration thereof
US6181090B1 (en) 1998-07-28 2001-01-30 Matsushita Electric Works, Ltd. Drive control method for linear oscillating motors and a linear oscillating motor
US20160226364A1 (en) * 2015-01-30 2016-08-04 Sunbeam Products, Inc. Electric Hair Clipper/Trimmer

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4117225A1 (en) * 1991-05-27 1992-12-03 Philips Patentverwaltung Vibration device for electric razor or hair-cutter - has oscillating rotor acted on by spring-biassed tensioning cable supporting vibration stage
DE4117227A1 (en) * 1991-05-27 1992-12-03 Philips Patentverwaltung Vibration device for electric razor or hair-cutter - uses oscillation device controlled by electric stator with resetting springs limiting oscillation amplitude
JP3540311B2 (en) 2002-05-31 2004-07-07 松下電器産業株式会社 Motor drive control device
DE102005060653A1 (en) * 2005-12-19 2007-06-21 Robert Bosch Gmbh Device for detecting an object
EP3771527A1 (en) * 2019-07-30 2021-02-03 Koninklijke Philips N.V. Hair-cutting apparatus

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0674979A1 (en) * 1994-03-28 1995-10-04 Matsushita Electric Works, Ltd. Reciprocatory dry shaver
WO1995026261A1 (en) * 1994-03-28 1995-10-05 Matsushita Electric Works, Ltd. Reciprocatory dry shaver
US5632087A (en) * 1994-03-28 1997-05-27 Matsushita Electric Works, Ltd. Reciprocatory dry shaver
CN1045915C (en) * 1994-03-28 1999-10-27 松下电工株式会社 Reciprocatory dry shaver
CN1094815C (en) * 1994-03-28 2002-11-27 松下电工株式会社 Reciprocatory dry shaver
DE19621598A1 (en) * 1995-05-31 1996-12-05 Matsushita Electric Works Ltd Linear vibrational motor e.g. for electric razor
US5736797A (en) * 1995-05-31 1998-04-07 Matsushita Electric Works, Ltd. Linear oscillating motor
DE19621598C2 (en) * 1995-05-31 1998-07-02 Matsushita Electric Works Ltd Linear vibration motor
US5955799A (en) * 1997-02-25 1999-09-21 Matsushita Electric Works, Ltd. Linear vibration motor and method for controlling vibration thereof
US6181090B1 (en) 1998-07-28 2001-01-30 Matsushita Electric Works, Ltd. Drive control method for linear oscillating motors and a linear oscillating motor
US20160226364A1 (en) * 2015-01-30 2016-08-04 Sunbeam Products, Inc. Electric Hair Clipper/Trimmer

Also Published As

Publication number Publication date
JPH0252692A (en) 1990-02-22
CN1039375A (en) 1990-02-07
EP0349077A3 (en) 1991-04-03
DE3822333A1 (en) 1990-01-04

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