US2759114A - Hair cutting machine having a vibrating armature drive - Google Patents

Hair cutting machine having a vibrating armature drive Download PDF

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Publication number
US2759114A
US2759114A US300248A US30024852A US2759114A US 2759114 A US2759114 A US 2759114A US 300248 A US300248 A US 300248A US 30024852 A US30024852 A US 30024852A US 2759114 A US2759114 A US 2759114A
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US
United States
Prior art keywords
armature
core member
shaped core
outer arms
casing
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
US300248A
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English (en)
Inventor
Rolli Wendel
Hausrath Herbert
Klett Erich
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Robert Bosch GmbH
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Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
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Publication of US2759114A publication Critical patent/US2759114A/en
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    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K33/00—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
    • H02K33/16—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with polarised armatures moving in alternate directions by reversal or energisation of a single coil system

Definitions

  • the present invention relates to a hair cutting machine having an electromagnetic drive including a vibrating armature which is periodically attracted by an electromagnet excited by alternating current.
  • the present invention is based on the knowledge that in the known arrangements the electromagnetic tractive forces are. unfavourably related to the actual position of the oscillating armature, because the forces reach. their maximum value just at that time when the armature is closest to the electromagnet and the cutting blade 0f: the cutter head has reached one extremity of its traveh i. e. a point, on its track at which it reverses.v
  • An arrange,- ment correspondingy to the kinetic principles would therefore have to produce oppostcly acting driving forces, especially at the aforedescribed moments, so that a phase displacement of 180," should exist between deflection and driving force.
  • Fig. 1 is a longitudinal section, along the lino 1.*-1 of Fig. 2., of a hair cutting machine driven by a rocking armature,
  • Fig. Z is. another longitudinal section along the line lI-Il of Fig. l with the cutter head removed, and
  • Fig. 3 is a cross section along the line Ill-sill of Fig. l.
  • the driving mechanism of the hair cutting machine shown in the drawings is housed in two handle parts. 11 and 12 of pressed material and consists essentially of an E-shaped magnet core. 13, a laminated oscillating or rocking armature 14 and a cranked driving arm. 155 mounted on the armature. When a cutter headv 16. is attached the arm 1 5 engages in a recess ouv the cutter blade. Exciter coils 20, y21 arey slipped over outer arms 17 and 18 of the magnet core 13,.
  • the exciter coils 20 and 21 which are wound with the same number of turns and are so 'disposed that on being connected to an alternating current supply in a circuit including a tumbler c ICC switch 22, they magnetise the free ends of they outer arms 17, 18 with opposite polarities.
  • the centre arm of the magnet core 13 includes a permanent magnet 2.4 having a pole piece 19 assembled from sheet iron.
  • the various parts of the magnet core that is to say the outer arms 17 and 1 8, the portion interconnecting them, the permanent magnet 24 and pole piece 19, are held together by two brass plates 28 and ⁇ 29,.
  • the permanent magnet 24' magnetises the two outer arms 17 and 18 symmetrically with a permanent magnetic flux as indicated by the broken arcuate arrowed lines in Fig'. 2.
  • the alternating UX produced by the exciter coils 20 and l21 is supcImPOSed on this permanent flux.
  • the amplitude of the alternating flux may he so adjusted that it is substantially or nearly equal to the magnitude of the. permanent flux.
  • the magnetic flux in one outer arm for example 17, owing to the current in exciter coil, for example 20, has just assumed double the value of the permanent flux, then the flux is substantially or nearly nil on the, other arm,I for example 1S, and the centre portion of the armature 1,4 rolls along the centre arm of thc magnet core which is adapted to form an arcuate rocking surface. 25', in the direction of the more extensively magnetised outer arm, for example 1,7.
  • resilient pivoting means i. e., a retaining spring ⁇ 26, one end of which is inserted in a recess 27 in the casing wall 12 whilst its other end projects in to an oppositely extending bore in the armature 14 and thus secures the armature from longitudinal displacements.
  • the spring 26 accordingly is a bearing element made of resilient material. It also serves the purpose of returningI the armature 14 to the centra-l position as shown, in the event ofl the current through the exciter coils current being interrupted.
  • the radius of curvature of the rolling surface 25 is considerable, it preferably amounts to, more than 20 times the: length of the rolling surface-the point of abutment ofthe, armature changes rapidly. Therefore a slight; approach of the armature to one of the outer arms, 17 for example, of the magnet core is sulicient to.
  • CM 65 mm.
  • CA 40 mm.
  • BA 10 mm.
  • the ratio k of the lengths of the load and effort arms thus changes for the left half of the armature from
  • the length of the lever arm upon which the spring1 26 presses when the armature is attracted from the central position is initially practically zero, but increases rapidly to AM. ln this manner the amature does not strike the outer pole piece if the spring 26 has been suitably chosen, and yet despite this ensures a strong driving impulse for the cutter blade up to shortly before reaching its reversing point.
  • An electro-magnetic drive for driving a cutter head in a hair cutting machine, including an electro-magnetic system having a core member, an armature member and exciter coils, said core member being E-shaped and having two outer arms and one centre arm, said centre arm having an arcuate outer surface, resilient pivoting means, pivotally holding said armature in abutting contact with said arcuate surface of said centre arm while permitting displacement of the armature from a given position towards either of said outer arms, said exciter coils being disposed on said outer arms for energisation of the electro-magnetic system from an alternating current electricity supply, and means to produce a permanent magnetic ux linkage at least said centre arm.
  • An electro-magnetic drive according to claim l a permanent magnet in said centre arrn for producing a permanent magnetic ux linking said core.
  • a hair clipper in combination, an elongated casing having opposite ends each of which is formed with an opening; an E-shaped core member supported in said casing with the arms of the E-shaped core member extending transversely to the length of said casing, the center arm of said E-shaped core member having a free arcuate end surface; a pair of coil windings arranged respectively about the outer arms of said E-shaped core member and adapted to be connected to a pair of energizing conductors passing through one of said openings in said casing; an elongated armature having a substantially central portion thereof located against said arcuate surface, and having opposite end portions respectively located opposite the free ends of said outer arms of said E-shaped core member so as to define a path with said E-shaped core member for the magnetic flux produced by the coil windings when energized; resilient means engaging said armature for urging the same into abutment with said arcuate surface of said center arm so as to cause said armature to rock on said arcuate surface
  • an elongated casing having opposite ends each of which is formed with an opening; an E-shaped core member supported in said casg. ing with the arms of the E-snaped core member extending transversely to the length of said casing, the center arm of said E-shaped core member having a free arcuate end surface and being longer than the outer arms of said E-shaped core member; a pair of coil windings arranged respectively about the outer arms of said E-shaped core member and adapted to be connected to a pair of energizing conductors passing through one of said openings in said casing; an elongated armature having a substantially central portion thereof located against said arcuate surface, and having opposite end portions respectively located opposite the free ends of said outer arms of said E-shaped core member so as to define a path with said E-shaped core member for the magnetic ux produced by the coil windings when energized; resilient means engaging said armature for urging the same into abutment with said arcuate
  • a hair clipper in combination, an elongated casing having opposite ends each of which is formed with an opening; an E-shaped core member supported in said casing with the arms of the i-shaped core member extending transversely to the length of said casing, the center arm of said E-shaped core member having a free arcuate end surface whose radius of curvature is equal to substantially ten times the peripheral length of said arcuate surface; a pair of coil windings arranged respectively about the outer arms of said E-shaped core member and adapted to be connected to a pair of energizing conductors passing through one of said openings in said casing; an elongated armature having a substantially central portion thereof located against said arcuate surface, and having opposite end portions respectively located opposite the free ends of said outer arms of said E-shaped core member so as to define a path with said E-shaped core member for the magnetic ux produced by the coil windings when energized; resilient means engaging said armature for urging the same into abutment with
  • a hair clipper in combination, an elongated casing having opposite ends each of which is formed with an opening; an E-shaped core member supported in said casing with the arms of the E-shaped core member extending transversely to the length of said casing, the center arm of said E-shaped core member having a free arcuate end surface and being longer than the outer arms of said E-shaped core member, said arcuate end surface having a radius of curvature equal to substantially ten times the peripheral length of said arcuate surface; a pair of coil windings arranged respectively about the outer arms of said E-shaped core member and adapted to be connected to a pair of energizing conductors passing through one of said openings in said casing; an elongated armature having a substantially central portion thereof located against said arcuate surface, and having opposite end portions respectively located opposite the free ends of said outer arms of said E-shaped core member so as to define a path with said E-shaped core member for the magnetic flux produced by the coil windings when energized
  • a hair clipper in combination, an elongated cas ing having opposite ends each of which is formed with an opening; an E-shaped core member supported in said casing with the arms of the Eshaped core member exa tending transversely to the length of said casing, the center arm of said E-shaped core member having a free arcuate end surface; a pair of coil windings arranged respectively about the outer arms of said E-shaped core member; a pair of energizing conductors passing through one of said openings in said casing and connected tothe coil windings, said coil windings when energized producing oppositely acting magnetic iiuxes in said outer arms of said E-shaped core member so as to magnetize said outer arms in opposite sense with respect to one another; an elongated armature having a substantially central pore tion located against said arcuate surface, and having opposite end portions respectively located opposite the free ends of said outer arms of said E-shaped core meme ber so as to deline a path with said E-shaped core mem
  • a hair clipper in combination, an elongated casing having opposite ends each of which is formed with, an opening; an E-shaped core member supported in said casing with the arms of the E-shaped core member extending transversely to the length of said casing, the center arm of said E-shaped core member having a free arcuate end surface, a portion of said center arm being partially in the form of a permanent magnet; a pair of coil windings arranged respectively about the outer arms of said E-shaped core member and adapted to be connected to a pair of energizing conductors passing through one of said openings in said casing; an elongated armature having a substantially central portion thereof located against said arcuate surface, and having opposite end portions respectively located opposite the free ends of said outer arms of said E-shaped core member so as to define a path with said E-shaped core member for the magnetic iiux produced by the coil windings when energized; resilent means engaging said armature for urging the same into abutment
  • an elongated casing having opposite ends each of which is formed with an opening; an E-shaped core member supported in said casing with the arms of the E-shaped core member extending transversely to the length of said casing, the center arm of said E-shaped core member having a free arcuate end surface, a portion of said center ann being partially in the form of a permanent magnet; a pair of coil windings arranged respectively about the outer arms of said E-shaped core member; a pair of energizing conductors passing through one ofsaid open-ings said casing and connected to the coil windings, said coil windings when energized produce opposite acting' magnatiel fluxes in said outer arms of said E-shaped core member so as to magnetize said outer arms in opposite sense With respect to one another, the density of the magnetic ux produced by said coils being substantially equal to the density of the magnetic flux produced by said permanent magnet; an elongated armature having a substantially central portion located against said arcu
  • a hair clipper in combination, an elongated casing having opposite ends each of which is formed with an opening; an E-shaped core member supported in said casing with the arms of the E-shaped core member ex tending transversely to the lengthof said casing, the center arm of; said E-shaped core member having a free arcuate end surface and being longer than the outer arms of said Efshaped core member, a portion of said center arm being partially in the form of a permanent magnet; a. pair of coil windings arranged respectively about the outer arms of said E-shaped core member and adapted to be connected to a pair of energizing conductors passingthreugli one. ot said openings in. Said.
  • a hair clipper in combination, an elongated casing having opposite ends each of which is formed with an opening; an le-shaped core member supported in said casing with the arms of the E-shaped core member extending transversely to the length of said casing, the center arm of said E-shaped core member having a free arcuate end surface, a portion of said center' arm being partially in the form of a permanent magnet, said center arm being longer than the outer arms of said E-shaped core member; a pair of coil windings arranged respectively about the outer arms of said E-shaped core member; a pair of energizing conductors passing through one of said openings in said casing and connected to the coil windings, said coil windings when energized produce opposite acting magnetic fluxes in said outer arms of said E-shaped core member so as to magnetize said outer arms in opposite sense with respect to one another, the density of the magnetic flux produced by said coils being substantially equal to the density of the magnetic flux produced by said permanent magnet; an elongated core member
  • an elongated casing having opposite ends each of which is formed with an opening; an E-shaped core member supported in said casing with the arms of the E-shaped core member extending transversely to the length of said casing, the center arm of said E-shaped core member having a free end surface; a pair of coil windings arranged respectively about the outer arms of said E-shaped core member and adapted to be connected to a pair of energizing conductors passing through one of said openings in said casing; an elongated armature having a substantially central surface thereof located against said free end surface of said E-shaped core member, one of said surfaces being arcuate, said armature having opposite end portions respectively located opposite the free end portions of said cuter arms of said E-shaped core member so as to define a path with said E-shaped core member for the magnetic flux produced by the coil windings When energized; resilient means engaging said armature for urging the same into abutment with the free end surface of said center arm
  • An electromagnetic drive for driving a cutter head in a hair cutting machine including an electromagnetic system having a core member, an armature member and exciter coils, said core member being E-shaped and having two outer arms and one center arm, a permanent magnet in said center arm for producing a permanent magnetic flux linking said core, said center arm having an arcuate outer surface, means to resiliently urge said armature into abutting contact with said arcuate surface of said center arm and to permit displacement of the armature from a given position towards either of said outer arms, said exciter coils being oppositely acting and being disposed on said outer arms for magnetizing said outer arms in opposite directions to one another, and means for exciting said exciter coils from an alternating current electricity supply whereby the magnitude of the excitation of the electromagnetic system from the exciter coils is approximately equal to the magnitude of the premagnetization produced by said permanent magnet.
  • a housing unit in combination, a housing unit; an electromagnetic core unit arranged within said housing unit, one of said units having a guide face; an elongated armature having a portion with a face thereof superimposed on said guide face, at least one of Said faces being curved so that said elongated armature is adapted to carry out an oscillatory rolling movement on said guide face; and a bearing element consisting of resilient material and interposed between another face of said portion of said elongated armature and one of said units and supporting said portion of said elongated armature for damped movement in directions required during oscillatory rolling movement of said armature on said guide face.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Mechanical Engineering (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
  • Dry Shavers And Clippers (AREA)
US300248A 1951-08-10 1952-07-22 Hair cutting machine having a vibrating armature drive Expired - Lifetime US2759114A (en)

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Application Number Priority Date Filing Date Title
DE304471X 1951-08-10

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US2759114A true US2759114A (en) 1956-08-14

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US (1) US2759114A (es)
BE (1) BE512812A (es)
CH (1) CH304471A (es)
FR (1) FR1061367A (es)
GB (1) GB702374A (es)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2928028A (en) * 1957-03-20 1960-03-08 Ericsson Telefon Ab L M Polarized magnet arrangement
US3042817A (en) * 1958-06-14 1962-07-03 Avog Elektro Und Feinmechanik Oscillating electric motor with armature having a linear gap
US3157804A (en) * 1961-09-12 1964-11-17 Goodwin Mfg & Dev Company Inc Razor motor and casing therefor
US3480848A (en) * 1969-03-04 1969-11-25 Joseph H Church Electronic razor
US3538359A (en) * 1968-05-02 1970-11-03 Braun Ag Oscillating motor structure
US3630142A (en) * 1969-08-25 1971-12-28 Ncr Co Electromagnetic drive for print hammers
US5787587A (en) * 1996-04-19 1998-08-04 Wahl Clipper Corp. Vibrator motor
US20080204177A1 (en) * 2005-08-05 2008-08-28 Koninklijke Philips Electronics N.V. Pendulum Drive System for Personal Care Appliances
US20120030950A1 (en) * 2010-08-09 2012-02-09 Wahl Clipper Corporation Vibrator motor
US8461951B2 (en) * 2010-04-21 2013-06-11 Johnson Electric Dresden Gmbh Bistable magnetic actuators
EP3069833A3 (en) * 2015-03-18 2016-12-21 Ranir, LLC Spring mechanism for power device
US9929621B2 (en) 2015-03-18 2018-03-27 Ranir, Llc Spring mechanism for power device
US9999486B2 (en) 2015-03-18 2018-06-19 Ranir, Llc Spring mechanism for power device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160226364A1 (en) * 2015-01-30 2016-08-04 Sunbeam Products, Inc. Electric Hair Clipper/Trimmer

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1891486A (en) * 1931-09-21 1932-12-20 Wahl Clipper Corp Electromagnetic clipper regulation
US1895292A (en) * 1931-04-24 1933-01-24 Brown & Sharpe Mfg Clipper
GB436717A (en) * 1934-03-17 1935-10-17 Herbert Hausrath Improvements in electromagnetic devices
CH187234A (de) * 1936-03-18 1936-10-31 Fr Ghielmetti & Cie A G Wechselstrom-Elektromagnet.
US2063116A (en) * 1933-10-21 1936-12-08 Eric N Nordhem Vibratory electrical motor
US2304525A (en) * 1941-08-11 1942-12-08 Andis Clipper Co Hair clipper
FR887698A (fr) * 1941-04-18 1943-11-19 Fides Gmbh Relais à vide
US2404227A (en) * 1943-01-08 1946-07-16 Gen Electric Electromagnetic control apparatus
US2610995A (en) * 1948-12-23 1952-09-16 Ernest R Orsatti Electromagnetic circuit interrupter

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1895292A (en) * 1931-04-24 1933-01-24 Brown & Sharpe Mfg Clipper
US1891486A (en) * 1931-09-21 1932-12-20 Wahl Clipper Corp Electromagnetic clipper regulation
US2063116A (en) * 1933-10-21 1936-12-08 Eric N Nordhem Vibratory electrical motor
GB436717A (en) * 1934-03-17 1935-10-17 Herbert Hausrath Improvements in electromagnetic devices
CH187234A (de) * 1936-03-18 1936-10-31 Fr Ghielmetti & Cie A G Wechselstrom-Elektromagnet.
FR887698A (fr) * 1941-04-18 1943-11-19 Fides Gmbh Relais à vide
US2304525A (en) * 1941-08-11 1942-12-08 Andis Clipper Co Hair clipper
US2404227A (en) * 1943-01-08 1946-07-16 Gen Electric Electromagnetic control apparatus
US2610995A (en) * 1948-12-23 1952-09-16 Ernest R Orsatti Electromagnetic circuit interrupter

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2928028A (en) * 1957-03-20 1960-03-08 Ericsson Telefon Ab L M Polarized magnet arrangement
US3042817A (en) * 1958-06-14 1962-07-03 Avog Elektro Und Feinmechanik Oscillating electric motor with armature having a linear gap
US3157804A (en) * 1961-09-12 1964-11-17 Goodwin Mfg & Dev Company Inc Razor motor and casing therefor
US3538359A (en) * 1968-05-02 1970-11-03 Braun Ag Oscillating motor structure
US3480848A (en) * 1969-03-04 1969-11-25 Joseph H Church Electronic razor
US3630142A (en) * 1969-08-25 1971-12-28 Ncr Co Electromagnetic drive for print hammers
US5787587A (en) * 1996-04-19 1998-08-04 Wahl Clipper Corp. Vibrator motor
US7852182B2 (en) * 2005-08-05 2010-12-14 Koninklijke Philips Electronics N.V. Pendulum drive system for personal care appliances
US20080204177A1 (en) * 2005-08-05 2008-08-28 Koninklijke Philips Electronics N.V. Pendulum Drive System for Personal Care Appliances
US8461951B2 (en) * 2010-04-21 2013-06-11 Johnson Electric Dresden Gmbh Bistable magnetic actuators
US20120030950A1 (en) * 2010-08-09 2012-02-09 Wahl Clipper Corporation Vibrator motor
US8276279B2 (en) * 2010-08-09 2012-10-02 Wahl Clipper Corporation Hair clipper with a vibrator motor
US8549756B2 (en) 2010-08-09 2013-10-08 Wahl Clipper Corporation Hair clipper with a vibrator motor
EP3069833A3 (en) * 2015-03-18 2016-12-21 Ranir, LLC Spring mechanism for power device
US9929621B2 (en) 2015-03-18 2018-03-27 Ranir, Llc Spring mechanism for power device
US9999486B2 (en) 2015-03-18 2018-06-19 Ranir, Llc Spring mechanism for power device

Also Published As

Publication number Publication date
FR1061367A (fr) 1954-04-12
GB702374A (en) 1954-01-13
CH304471A (de) 1955-01-15
BE512812A (es)

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