EP0704567B1 - Vorrichtung zum Vermeiden der Unwucht in Wäschewaschmaschinen - Google Patents

Vorrichtung zum Vermeiden der Unwucht in Wäschewaschmaschinen Download PDF

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Publication number
EP0704567B1
EP0704567B1 EP95111984A EP95111984A EP0704567B1 EP 0704567 B1 EP0704567 B1 EP 0704567B1 EP 95111984 A EP95111984 A EP 95111984A EP 95111984 A EP95111984 A EP 95111984A EP 0704567 B1 EP0704567 B1 EP 0704567B1
Authority
EP
European Patent Office
Prior art keywords
spin
speed
extraction
drum
unbalance
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
EP95111984A
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English (en)
French (fr)
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EP0704567A1 (de
Inventor
Silvio Battistella
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.)
Electrolux Zanussi SpA
Original Assignee
Electrolux Zanussi Elettrodomestici SpA
Electrolux Zanussi SpA
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Publication date
Application filed by Electrolux Zanussi Elettrodomestici SpA, Electrolux Zanussi SpA filed Critical Electrolux Zanussi Elettrodomestici SpA
Publication of EP0704567A1 publication Critical patent/EP0704567A1/de
Application granted granted Critical
Publication of EP0704567B1 publication Critical patent/EP0704567B1/de
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    • DTEXTILES; PAPER
    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06FLAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F34/00Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/14Arrangements for detecting or measuring specific parameters
    • D06F34/16Imbalance
    • DTEXTILES; PAPER
    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06FLAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F33/00Control of operations performed in washing machines or washer-dryers 
    • D06F33/30Control of washing machines characterised by the purpose or target of the control 
    • D06F33/48Preventing or reducing imbalance or noise
    • DTEXTILES; PAPER
    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06FLAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/26Imbalance; Noise level
    • DTEXTILES; PAPER
    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06FLAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/46Drum speed; Actuation of motors, e.g. starting or interrupting
    • D06F2105/48Drum speed
    • DTEXTILES; PAPER
    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06FLAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F33/00Control of operations performed in washing machines or washer-dryers 
    • D06F33/30Control of washing machines characterised by the purpose or target of the control 
    • D06F33/32Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry
    • D06F33/40Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry of centrifugal separation of water from the laundry

Definitions

  • the present invention refers to a clothes washing machine, such as in particular a household clothes washing machine, provided with improved arrangements capable of measuring and re-balance unbalanced washloads in the rotating drum of such washing machines when the washload undergoes spin-extraction cycles in the same machines.
  • the Italian patent application IT PN91A000020 by the same applicant teaches how to detect unbalance conditions on the basis of the phase shift between the absorbed current and the supply voltage of the drum driving motor.
  • a laundry washing machine provided with speed control means for a variable speed electric motor for rotationally driving a mass with a changeable centre of gravity
  • the speed control means comprising detecting means for detecting the degree of any eccentricity of the centre of gravity of such mass relative to the axis of rotation thereof,determining means for determining an optimum motor speed in dependence on the detected degree of any such eccentricity, and regulating circuit means for regulating the supply of operating current to such motor in dependence on the determined optimum speed.
  • Such detecting means determine the eccentricity force of the centre of gravity of the mass and feeds it as a control value to the control circuit, which in its turn delivers the target value to the regulating circuit.
  • the maximum rotational speed of the mass for example a loaded laundry drum, is optimally selected in correspondence with the eccentricity conditions.
  • a procedure is made at increasing speeds; this circumstance doesn't prevent clothes from tending to get pressed into the perforations in the wall of the drum during the intermediate spin sequence, such fact preventing to achieve the optimum laundry distribution and therefore the best overall drum balance for the subsequent spin extraction phase.
  • water will be used in a general way to also mean washing liquor or rinsing water. Such a simplification, however, will not impair the clear comprehensibility of the description owing to the particular context in which said terms are used, as anyone skilled in the art can readily appreciate.
  • the clothes washing machine being described comprises a washing tub, a drum that is rotatably mounted within said washing tub and is capable of holding the items forming the washload, a selectively actuatable drain pump, a driving motor adapted to operate at preselectably variable speeds, an arrangement adapted to detect the unbalance condition of the washload in the rotating drum, to selectively compare it with a plurality of pre-determined unbalance levels and to selectively start different actions or operation modes according to the outcome of said comparisons.
  • the arrangement monitoring the unbalance condition of the washload in the drum is then activated: if the detected unbalance condition turns out to be lower than a pre-established value B c1 , the spin-extraction phase goes on beyond said time T 2 ; if on the contrary said condition does not occur, the same spin-extraction sequence is brought back to the afore considered time T 0 , from which the just described sequence then starts again.
  • Such a procedure of low-speed rotations BV, low-speed spin-extraction phases CBV and check-ups of the unbalance condition of the washload is repeated automatically until either a lower value than the specified level B c1 is reached or the same procedure has been repeated for a pre-determined maximum number of times.
  • the just described procedure is substantially known in the art, so that it shall not be explained here any further.
  • the drum is abruptly driven to perform a spin-extraction cycle for a short impulse, which it reaches in correspondence of the time T 3 and which lasts for a very short period of time, ie. approx. 3 seconds, at an intermediate speed of usually around 450 rpm.
  • the drum RPM is slowed down to the value of the slow-speed spin-extraction sequence CBV and is kept at that value throughout the period extending from the time T 7 to the time T 8 , during which the unbalance condition of the washload is then measured and checked.
  • the washload is found to have any greater unbalance than a pre-determined level B c2 , then the whole spin-extraction phase is cycled back to the beginning, ie. to the time T 0 , since that would practically mean that the unbalance condition is still in excess of what is actually required in order to be able to safely start any further spin-extraction sequence at still higher speeds.
  • the existing unbalance condition albeit reduced in its extent, would necessarily have to be accepted as such and, at the same time, it would also be necessary that the spin-extraction speed be anyway limited to a lower value than the highest one VC max provided for by the cycle in order to avoid creating conditions of marked vibrations, with limited-amplitude, but high-frequency oscillations of the machine which, albeit not prohibitive as far as the correct operation and the integrity of the structure of the machine are concerned, would be transmitted through the base of the machine to the floor and, ultimately, the whole room.
  • the present invention may be further improved in an advantageous manner through the additions of various features.
  • the unbalance condition detected in the time interval T 7 -T 8 is found to be at a level which is below the afore cited pre-determined highest allowable level B c2 , but higher than a pre-determined intermediate level B c3 , the subsequent final spin-extraction sequence may be performed at a speed which is reduced to the value VC 1 , ie. a value which is slightly lower than the highest spin-extraction speed VC max , but anyway still adequate in order to ensure an acceptable spin-extraction result without giving rise to the undesired vibrations transmitted by the machine.
  • Figure 2 is self-explaining for anyone skilled in the art and shows a block diagram illustrating the logical flow of the various sequences of drum rotation, measurement of the washload unbalance condition, and corresponding decision concerning the step to be taken subsequently, with reference to the most important ones cited in this description.
  • the measurement of the unbalance condition which is subsequently performed during the intermediate-speed spin-extraction sequence in the time interval T 7 -T 8 has the purpose to ensure that the unbalance level of the washload is as low as to be able to keep within pre-determined limits the vibrations transmitted by the machine to the surrounding structure of the building during the subsequent high-speed final spin-extraction sequence.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
  • Centrifugal Separators (AREA)

Claims (8)

  1. Waschmaschine, insbesondere Waschmaschine für den Haushalt, mit einem Waschbehälter, einer im Waschbehälter drehbar gelagerten Waschtrommel zur Aufnahme des Waschgutes, einem Elektromotor zum Antreiben der Waschtrommel mit unterschiedlichen, vorwählbaren Umdrehungsgeschwindigkeiten, welche mit einer Vorrichtung zum Ermitteln des Unwucht-Zustandes des Waschgutes, versehen ist,wobei die Waschmaschine geeignet ist, eine Schleuder- Entwässerungs-Phase durchzuführen, bestehend aus:
    a) einer ersten Sequenz von Waschtrommel-Umdrehungen in einer alternierenden Drehrichtung mit einer Geschwindigkeit, die niedriger ist als die niedrige Schleuder-Entwässerungs-Geschwindigkeit (CBV),
    b) einer ersten Sequenz von Waschtrommel-Umdrehungen bei niedriger Schleuder-Entwässerungs-Geschwindigkeit (CBV), um das Waschgut gleichmäßig an der Trommel-Innenseite zu verteilen;
    c) wobei überwacht wird, ob der Unwucht-Zustand niedriger ist als ein erstes vorbestimmtes Unwucht-Niveau und wobei die ersten zwei Sequenzen wiederholt werden, wenn der Unwucht-Zustand größer als besagtes Unwucht-Niveau ist;
    gekennzeichnet dadurch, daß
    d) wenn der Unwucht-Zustand niedriger ist als besagtes erstes Unwucht-Niveau, der Schleuder-Entwässerungs-Impuls für einen sehr kurzen Zeitraum mit einer mittleren Schleuder-Entwässerungs-Geschwindigkeit (CMV) ausgeführt wird; und
    e) die Waschtrommel-Umdrehungsgeschwindigkeit auf besagte niedrige Schleuder-Entwässerungs-Geschwindigkeit (CBV)verlangsamt wird, um so das Waschgut an der Waschtrommel-Innenwand zu halten; und
    f) die Waschtrommel-Umdrehungsgeschwindigkeit auf besagte mittlere Schleuder-Entwässerungs-Geschwindigkeit (CMV)erhöht und für einen vorbestimmten Zeitraum aufrechterhalten wird; und
    g) die Verlangsamung auf die niedrige Schleuder-Entwässerungs-Geschwindigkeit (CBV) heruntergefahren und für eine vorbestimmte Zeit aufrechterhalten wird, während der der Unwucht-Zustand gemessen wird.
  2. Waschmaschine nach Anspruch 1, dadurch gekennzeichnet, daß, wenn festgestellt wird, daß der so ermittelte Unwucht-Zustand größer als ein zweiter voreingestellter Wert (Bc2) ist, die Schleuder-Entwässerungs-Phase auf den Beginn besagter Anfangs-Sequenz (T0) von niedriger Geschwindigkeit zurückgeführt wird, wobei die Drehung der Waschtrommel alterniert.
  3. Waschmaschine nach Anspruch 2, dadurch gekennzeichnet, daß, wenn festgestellt wird, daß besagter Unwucht-Zustand unter dem zweiten voreingestelltem Wert (Bc2) liegt, jedoch über einem dritten voreingestellten Wert (Bc3) liegt, die Schleuder-Entwässerungs-Phase mit einer Schleuder-Entwässerungs-Geschwindigkeit fortgesetzt wird, die auf einen Wert (VC1), begrenzt ist, welcher niedriger ist als die angegebene höchste Schleuder-Entwässerungs-Geschwindigkeit (Vmax) der Waschmaschine.
  4. Waschmaschine nach einem der Ansprüche 2 oder 3, dadurch gekennzeichnet, daß, wenn festgestellt wird, daß besagter Unwucht-Zustand niedriger als der dritte vorgegebene Unwucht-Wert (Bc3) ist, die Schleuder-Entwässerungs-Phase bis zur angegebenen höchsten Schleuder-Entwässerungs-Geschwindigkeit (Vmax) der Waschmaschine fortgesetzt wird.
  5. Waschmaschine nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß besagte Waschgut-Gleichgewichts-Geschwindigkeit bei niedriger Schleuder-Entwässerungs-Geschwindigkeit (T1-T2), welche aus einer ersten Reduzierung der Rotationsgeschwindigkeit der Waschtrommel auf einen Wert unter der niedrigsten Schleuder-Entwässerung-Geschwindigkeit und anschließender Erhöhung besagter Geschwindigkeit wieder auf die besagte langsame Schleuder-Entwässerungs-Geschwindigkeit (CBV)besteht, solange in automatisch wiederholender Weise durchgeführt wird, bis das Waschgut sich effektiv entlang den Wänden der Trommel neu verteilt hat, sodaß das erste Gleichgewichts-Niveau (Bc1) erreicht wird.
  6. Waschmaschine nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß besagte langsame Schleuder-Entwässerungs-Geschwindigkeit (CBV) etwa 85 Umdrehungen pro Minute beträgt.
  7. Waschmaschine nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß besagte mittlere Schleuder-Entwässerungs-Geschwindigkeit (CMV) etwa 450 Umdrehungen pro Minute beträgt.
  8. Waschmaschine nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß besagter Schleuder-Entwässerungs-Impuls (T3) bei mittlerer Schleuder-Entwässerungs-Geschwindigkeit etwa drei Sekunden lang dauert.
EP95111984A 1994-09-28 1995-07-31 Vorrichtung zum Vermeiden der Unwucht in Wäschewaschmaschinen Expired - Lifetime EP0704567B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPN940057 1994-09-28
IT94PN000057A IT1267586B1 (it) 1994-09-28 1994-09-28 Lavabiancheria con dispositivo perfezionato anti-sbilanciamento

Publications (2)

Publication Number Publication Date
EP0704567A1 EP0704567A1 (de) 1996-04-03
EP0704567B1 true EP0704567B1 (de) 1999-03-24

Family

ID=11394949

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95111984A Expired - Lifetime EP0704567B1 (de) 1994-09-28 1995-07-31 Vorrichtung zum Vermeiden der Unwucht in Wäschewaschmaschinen

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EP (1) EP0704567B1 (de)
JP (1) JP3681444B2 (de)
DE (1) DE69508510T2 (de)
ES (1) ES2132474T3 (de)
IT (1) IT1267586B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008075987A3 (en) * 2006-12-21 2008-07-31 Fisher & Paykel Appliances Ltd Improved laundry appliance

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IT1285703B1 (it) * 1996-05-14 1998-06-18 Merloni Antonio Spa Procedimento di lavaggio anti-incollamento della biancheria al cestello, nelle macchine lavabiancheria
JPH10216391A (ja) * 1997-02-12 1998-08-18 Toshiba Corp ドラム式洗濯機
PT1088126E (pt) 1998-04-14 2005-04-29 Tulga Simsek Uma maquina e um metodo para o equilibrio de uma tal maquina
IT1305553B1 (it) * 1998-11-10 2001-05-09 Electrolux Zanussi Elettrodome Metodo per controllare lo sbilanciamento del carico in unalavabiancheria
CN1318619C (zh) * 2004-08-30 2007-05-30 金川集团有限公司 一种钴电解液的除铜方法
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AU2009327647B2 (en) 2008-12-17 2012-07-19 Fisher & Paykel Appliances Limited A laundry machine
CN102317533B (zh) 2009-02-11 2014-07-16 Lg电子株式会社 洗涤方法及洗衣机
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US10533275B2 (en) 2009-07-27 2020-01-14 Lg Electronics Inc. Control method of a laundry machine
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CN102162031B (zh) * 2011-04-11 2012-09-05 山东交通职业学院 一种钴电解液的除铁方法
JP5978522B2 (ja) * 2012-06-19 2016-08-24 東芝ライフスタイル株式会社 洗濯乾燥機
CN110714300B (zh) * 2018-06-26 2022-08-05 青岛海尔洗衣机有限公司 用于衣物洗涤设备的平衡修正方法以及衣物洗涤设备
CN110438747B (zh) * 2019-07-12 2021-07-20 合肥美的洗衣机有限公司 衣物的识别方法、装置和衣物处理装置

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008075987A3 (en) * 2006-12-21 2008-07-31 Fisher & Paykel Appliances Ltd Improved laundry appliance
AU2007334750B2 (en) * 2006-12-21 2011-12-01 Fisher & Paykel Appliances Limited Improved laundry appliance

Also Published As

Publication number Publication date
JP3681444B2 (ja) 2005-08-10
DE69508510T2 (de) 1999-09-23
ITPN940057A1 (it) 1996-03-28
EP0704567A1 (de) 1996-04-03
DE69508510D1 (de) 1999-04-29
ES2132474T3 (es) 1999-08-16
JPH08112487A (ja) 1996-05-07
ITPN940057A0 (it) 1994-09-28
IT1267586B1 (it) 1997-02-07

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