EP0736625B1 - Dispositifs pour prévenir le balourd d'une machine à laver le linge à chargement par le haut - Google Patents

Dispositifs pour prévenir le balourd d'une machine à laver le linge à chargement par le haut Download PDF

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Publication number
EP0736625B1
EP0736625B1 EP96103921A EP96103921A EP0736625B1 EP 0736625 B1 EP0736625 B1 EP 0736625B1 EP 96103921 A EP96103921 A EP 96103921A EP 96103921 A EP96103921 A EP 96103921A EP 0736625 B1 EP0736625 B1 EP 0736625B1
Authority
EP
European Patent Office
Prior art keywords
drum
washload
lid
unbalance
washing machine
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
EP96103921A
Other languages
German (de)
English (en)
Other versions
EP0736625A1 (fr
Inventor
Silvio Battistella
Silvano Cimetta
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
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 Electrolux Zanussi Elettrodomestici SpA, Electrolux Zanussi SpA filed Critical Electrolux Zanussi Elettrodomestici SpA
Publication of EP0736625A1 publication Critical patent/EP0736625A1/fr
Application granted granted Critical
Publication of EP0736625B1 publication Critical patent/EP0736625B1/fr
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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F33/00—Control of operations performed in washing machines or washer-dryers 
    • D06F33/30—Control of washing machines characterised by the purpose or target of the control 
    • D06F33/48—Preventing or reducing imbalance or noise
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/26—Imbalance; Noise level

Definitions

  • the present invention refers to a clothes washing machine provided with a cylindrical drum arranged to rotate about a horizontal axis and having an opening in its outer side mantle, and with improved means adapted to measure and balance unbalanced washloads in the drum of such clothes washing machines during the execution of spin-extraction phases, without any need arising to make use of permanent masses to counter-balance the weight of the lid (see FR-A-2 645 553).
  • sensors of various kinds are used to measure oscillations in view of detecting the unbalance condition, whereas unbalance conditions are determined according to the patent specification J 6013 2598 by comparing the rotating speed of the drum against a pre-determined reference rotating speed profile that is stored in advance in the system's memory.
  • said lid along with the opening, locking and reinforcement means associated therewith, generates an additional mass whose weight can reasonably be considered to amount to approx. 500 to 600 gr.
  • the second drawback refers to the need arising to reinforce the lid.
  • the latter tends to quite evenly distribute all along the inner periphery of the cylindrical mantle of the drum, and therefore also in corrispondence of the loading lid, which, as a consequence, must be able to withstand the centrifugal force imparted to the corresponding portion of washload and must therefore be strengthened accordingly in its various load-bearing elements, such as hinges, walls, pins, etc.
  • this adds significantly to the manufacturing costs, too.
  • the clothes washing machine being described comprises a drum 2 rotating within a washing tub (not shown) and adapted to hold the washload 1, a lid 3 that can be opened to introduce the washload into the drum, a pre-selectably variable-speed driving motor, a plurality of rib-like elevators 4 adapted to favour the agitation of the washload, means adapted to detect the unbalance condition of the washload in the drum and selectively compare it against a plurality of pre-defined unbalance levels, as well as selectively perform different operations in accordance with the outcome of such comparisons.
  • a balancing mass 8 is associated to the rib-like elevator arranged in the opposite position with respect to the lid.
  • a machine arranged in such a manner is generally known, so that it will not be described here any longer.
  • the machine is provided with means (not shown) adapted to identify the rotational position of the drum with respect to the position of the lid, as well as control and actuation means adapted to receive and process the information concerning said position and generate corresponding control signals for the driving motor to start driving the drum at high spin-extraction speed.
  • means for identifying the position of the lid may be anyone among the various devices available and currently used to such a purpose, such as for instance a proximity sensor installed in the machine and adapted to co-operate with a corresponding appendix rotating with the drum, or a photoelectric cell adapted to detect the passage of a corresponding opaque element rotating with the drum.
  • Such elements defining the position of the rotating drum may also be mounted on means that rotate synchronically therewith, such as for instance the pulley associated therewith or the driving belt, provided that the position of the drum is in any case detected univocally.
  • the afore mentioned control and actuation means becomes activated to cause the drum to be driven for a pre-determined period at a sufficiently low speed of rotation, typically in the vicinity of 35 rpm, so as to prevent the washload items from getting distributed along the inner wall of the drum and enable them on the contrary to substantially collect on the bottom portion of the drum as they fall there by gravity and keep rolling there so as to maintain their lowest position.
  • the control means enables the position sensor to operate, so that when the latter conveys the signal indicating that the drum is in a position in which the lid is on top, this means that, at exactly that moment, the lid and the washload are positioned opposite to each other.
  • the washload acts as a lid-balancing mass, so that the overall unbalance is correspondingly reduced. And this is exactly the moment selected by the control means for actuating the driving motor so as to cause the drum to start rotating at high spin-extraction speed.
  • the drum only gradually manages to reach a spin-extraction speed of rotation which is sufficient to cause the washload item to keep sticking against the wall of the dum along the inner periphery thereof, so that a certain period of time, not very long indeed, but nevertheless quite appreciable, generally elapses from the moment in which the rotation at high spin-extraction speed is started, to the moment in which the washload items are actually sticking firmly against the wall of the drum.
  • the above described invention can be used to best advantage in machines with relatively low spin-extraction speeds of the drum. Unfortunately, however, the residual unbalance that remains in some cases may still prove excessive, ie. objectionable, in the presence of machines with drums rotating at high speeds during spin-extraction, so that an advantageous improvement of the same invention lies in combining the use of the well-known and currently applied unbalance detection technique and the elimination of the weight used to counterbalance the mass of the lid.
  • the washing machine is provided with means for detecting the unbalance condition, which are in turn associated to control and actuation means that, before any spin-extraction phase is started, activates the driving motor so as to cause the drum to rotate at a low speed V 1 , typically at approx. 85 rpm, which is however sufficient to cause the washload items to distribute along the inner periphery of the drum.
  • V 1 typically at approx. 85 rpm
  • the unbalance detecting means are activated, which preferably operate on the basis of the current absorbed by the motor.
  • the unbalance measured in this way will obviously be the overall unbalance brought about by the distribution of the washload items, which is usually quite uneven, and the presence of the mass of the lid.
  • control and actuation means are pre-arranged so as to be adapted to carry out the following sequence:
  • the sequence is returned to the starting point of the whole procedure, with the drum caused to slow down to a rotation speed V 0 , in correspondence of which the washload falls on to the bottom of the drum and the above described sequence is then started again.
  • a procedure of drum revolutions at low speed V 0 , drum revolutions at a higher speed V 1 and drum load balance controls is repeated automatically until a value is reached which is lower than the pre-set level B c1 , or until a pre-determined maximum number of repetitions of the same procedure has been completed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Centrifugal Separators (AREA)

Claims (2)

  1. Machine à laver le linge, munie de :
    une cuve de lavage,
    un tambour cylindrique tournant autour d'un axe horizontal dans ladite cuve et adapté pour tenir la charge de lavage qui est chargée en lui à travers un couvercle fermant une ouverture prévue dans une partie de la surface cylindrique du tambour, qui est exempt de toute masse d'équilibrage du poids du couvercle de chargement,
    un moteur adapté pour entraíner en rotation ledit tambour à des vitesses variables et pré-sélectionnables,
    des moyens adaptés pour identifier la position du couvercle de chargement, permettre au tambour de continuer à tourner pendant une durée prédéterminée à une vitesse de rotation faible adaptée, de manière à permettre à la charge de lavage de se rassembler sensiblement sur le fond du tambour et de continuer à tourner afin de maintenir une telle position pendant ladite période de rotation à faible vitesse du tambour, caractérisée en ce que ladite machine est capable de démarrer un essorage quand lesdits moyens indiquent que le couvercle de chargement a atteint sa position supérieure, de sorte que ladite phase d'extraction par essorage est lancée quand ledit couvercle de chargement et ladite charge de lavage sont placés en opposition mutuelle dans le tambour.
  2. Machine à laver le linge selon la revendication 1, caractérisée en ce que le tambour est autorisé à commencer à tourner à la grande vitesse d'essorage en avance par rapport au moment où le couvercle de chargement atteint sa position supérieure.
EP96103921A 1995-04-06 1996-03-13 Dispositifs pour prévenir le balourd d'une machine à laver le linge à chargement par le haut Expired - Lifetime EP0736625B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT95PN000021A IT1282416B1 (it) 1995-04-06 1995-04-06 Lavabiancheria a carica dall'alto con mezzi perfezionati anti-sbilanciamento
ITPN950021 1995-04-06

Publications (2)

Publication Number Publication Date
EP0736625A1 EP0736625A1 (fr) 1996-10-09
EP0736625B1 true EP0736625B1 (fr) 1999-11-10

Family

ID=11395012

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96103921A Expired - Lifetime EP0736625B1 (fr) 1995-04-06 1996-03-13 Dispositifs pour prévenir le balourd d'une machine à laver le linge à chargement par le haut

Country Status (4)

Country Link
EP (1) EP0736625B1 (fr)
DE (1) DE69605073T2 (fr)
ES (1) ES2141409T3 (fr)
IT (1) IT1282416B1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8984693B2 (en) 2010-12-10 2015-03-24 Whirlpool Corporation Method and apparatus for redistributing an imbalance in a laundry treating appliance
US9267225B2 (en) 2011-12-22 2016-02-23 Whirlpool Corporation Method of estimating bending moment of a laundry treating appliance drum shaft using a proximity sensor
US9279206B2 (en) 2011-03-30 2016-03-08 Whirlpool Corporation Method and apparatus for forming a counterbalance to an imbalance in a laundry treating appliance

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010013933B4 (de) * 2010-04-06 2011-11-24 Diehl Ako Stiftung & Co. Kg Verfahren zum Betrieb eines Wäschebehandlungsgerätes
CN112342736A (zh) * 2019-08-08 2021-02-09 青岛海尔洗衣机有限公司 洗涤设备及其控制方法、存储设备、处理设备

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1038355B (it) * 1975-05-22 1979-11-20 Ire Spa Procedimento e macchina automatica per lavare e centrifugare la biancheria
DE3039315C2 (de) * 1980-10-17 1984-10-31 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Schaltungsanordnung zur Stromversorgung eines drehzahlregelbaren Elektromotors
DE3822924C1 (fr) * 1988-07-07 1989-11-23 Miele & Cie Gmbh & Co, 4830 Guetersloh, De
DE3911124A1 (de) * 1989-04-06 1990-10-11 Licentia Gmbh Trommeldrehzahl-steuerungsverfahren fuer haushaltwaschmaschinen und vorrichtung zur durchfuehrung des verfahrens
FR2656010B1 (fr) * 1989-12-15 1992-02-28 Ciapem Procede d'arret d'un tambour d'un lave-linge mettant le portillon du tambour en vis-a-vis de la porte du lave-linge et lave-linge mettant en óoeuvre un tel procede.
FR2666826B1 (fr) * 1990-09-14 1992-10-23 Ciapem Machine a tambour horizontal rotatif a position predeterminee a l'arret.
IT1244989B (it) * 1991-01-11 1994-09-13 Merloni Elettrodomestici Spa Lavatrice perfezionata

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8984693B2 (en) 2010-12-10 2015-03-24 Whirlpool Corporation Method and apparatus for redistributing an imbalance in a laundry treating appliance
US9279206B2 (en) 2011-03-30 2016-03-08 Whirlpool Corporation Method and apparatus for forming a counterbalance to an imbalance in a laundry treating appliance
US9267225B2 (en) 2011-12-22 2016-02-23 Whirlpool Corporation Method of estimating bending moment of a laundry treating appliance drum shaft using a proximity sensor

Also Published As

Publication number Publication date
DE69605073T2 (de) 2000-03-16
EP0736625A1 (fr) 1996-10-09
ITPN950021A1 (it) 1996-10-06
ES2141409T3 (es) 2000-03-16
DE69605073D1 (de) 1999-12-16
IT1282416B1 (it) 1998-03-23
ITPN950021A0 (it) 1995-04-06

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