EP0224776B1 - Machine à laver automatique à tambour rotatif - Google Patents

Machine à laver automatique à tambour rotatif Download PDF

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Publication number
EP0224776B1
EP0224776B1 EP86115826A EP86115826A EP0224776B1 EP 0224776 B1 EP0224776 B1 EP 0224776B1 EP 86115826 A EP86115826 A EP 86115826A EP 86115826 A EP86115826 A EP 86115826A EP 0224776 B1 EP0224776 B1 EP 0224776B1
Authority
EP
European Patent Office
Prior art keywords
laundering
washing machine
pressure
pressure switch
tub
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
EP86115826A
Other languages
German (de)
English (en)
Other versions
EP0224776A3 (en
EP0224776A2 (fr
Inventor
Maurizio Mori
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.)
Industrie Zanussi SpA
Original Assignee
Industrie 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 Industrie Zanussi SpA filed Critical Industrie Zanussi SpA
Priority to AT86115826T priority Critical patent/ATE64632T1/de
Publication of EP0224776A2 publication Critical patent/EP0224776A2/fr
Publication of EP0224776A3 publication Critical patent/EP0224776A3/en
Application granted granted Critical
Publication of EP0224776B1 publication Critical patent/EP0224776B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/30—Driving arrangements 
    • D06F37/304—Arrangements or adaptations of electric motors
    • 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
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/08—Control circuits or arrangements thereof
    • 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
    • D06F2103/24—Spin speed; Drum movements
    • 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
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/46—Drum speed; Actuation of motors, e.g. starting or interrupting
    • D06F2105/48—Drum speed

Definitions

  • the present invention relates to an automatic washing machine operable to carry out washing cycles and spin--drying cycles by means of a rotating drum for containing laundry.
  • EP-A-0202 509 a document according to Article 54(3), discloses a laundry washing machine wherein a laundering liquid is collected in a receptacle at the bottom of the laundering tub and recirculated to the interior of a rotating drum for soakening the laundry contained therein. The water level is checked by a pressure sensing device. In the course of the laundering cycle, the drum is periodically made to rotate at the spin-drying speed for extracting from the laundry a quantity of the laundering liquid sufficient for the operation of the recirculation pump.
  • This laundry washing machine is particularly advantageous in that it permits considerable savings of water, detergents and electric energy to be obtained.
  • the laundering tub contains not only water, but also detergents during the periodic spin-drying phases.
  • these periodic spin-drying phases may give rise, particularly when their duration exceeds a certain value of for instance three seconds, to the formation of an excessive quantity of foam in the tub, which tends to escape from the machine, for instance through the detergent distributor.
  • This troublesome phenomenon may occur with relative facility due to the tolerances of the components of the machine and to the variability of certain parameters such as the spin-drying speed, the temperature of the laundering liquid and the type of detergent employed.
  • an automatic washing machine comprising a laundering tub and a drum mounted therein for rotation by means of an electric motor for carrying out at least one laundering cycle during which the laundry is soaked with a laundering liquid, and the motor operates at a reduced rotational speed, and at least one intervening phase during which the motor operates at the rotational speed for spin-drying the laundry
  • the washing machine comprising control means adapted to detect the pressure in the interior of the laundering tub and to terminate the spin-drying phase when said pressure exceeds a predetermined value due to excessive formation of foam within the laundering tub.
  • the washing machine comprises a program unit in the form for instance of a timer having a number of cams rotating at different speeds for the operation of associated electric contacts for the combined operation of various functional elements.
  • the actuator solenoid 19 of a water supply solenoid valve is adapted to be connected between terminals 5 and 6 of an electric power supply via a circuit breaker 7 and a pressure switch 4 connected in series.
  • the movable contact 9 of pressure switch 4 is adapted to connect terminal 5 to fixed contacts 41 or 42, respectively, when the pressure switch detects an "empty" or “full” state of a liquid collector receptacle provided in the machine.
  • the washing machine also comprises an electric motor for rotating the drum of the machine; this motor includes a low-speed winding section 10 and a high-speed winding section 11.
  • low-speed winding section 10 is adapted to be connected between terminals 5 and 6 through a series-connected circuit comprising pressure switch 4 (when detecting the "full" state), circuit breakers 12 and 13, and a per se known inverter 14 including a phase shift capacitor 15 having two fixed contacts selectively engageable by a movable contact 16 actuated by a fast cam.
  • the high-speed winding section 11 of the motor on its part is adapted to be connected between terminals 5 and 6 by a series-connected circuit including pressure switch 4 (when detecting the "full" state), circuit breaker 12 and a pair of circuit breakers 17 and 18 actuated respectively by a slow cam and a fast cam of the program unit.
  • high-speed winding section 11 is additionally connected to a further pressure switch 8 adapted to detect the pressure in the interior of the laundering tub of the machine.
  • a movable contact 20 of pressure switch 8 is closed on a fixed contact 81 connected to high-speed winding section 11 as long as the pressure within the laundering tub is below a predetermined value P2 (fig. 2) beyond which there occurs an excessive formation of foam.
  • Pressure switch 8 is positioned and calibrated in such a manner that its movable contact 20 closes on a blind fixed contact 82 when the said pressure value P2 is detected.
  • the circuit also includes a small electric motor 21 for advancing the timer, this motor being connected between terminals 5 and 6 by the series-connected circuit of pressure switch 4 and circuit breaker 12.
  • circuit of fig. 1 is to be understood to include further functional components controlled by the program unit, such as a discharge pump, heater elements, a recirculation pump etc., these elements being not shown for the sake of simplification.
  • the overall operation of the washing machine proceeds substantially as known.
  • Solenoid valve 19 is actuated to admit water and detergent to the washing machine until pressure switch 4 detects a predetermined water level, causing its movable contact 9 to close on fixed contact 42 for energizing timer motor 21.
  • the operation of the timer causes circuit breaker 13 to close for energizing low-speed winding section 10 of the drum motor, so that the drum is rotated at a low speed in alternating directions.
  • the laundering liquid is concurrently heated and supplied to the interior of the drum so as to soak the laundry therein.
  • the pressure within the laundering tub is stabilized at a value P1 as shown at t1 in fig. 2, this value remaining substantially constant.
  • timer 21 at a predetermined instant operates to close circuit breaker 17, so that during an interval between the rotations of the drum in opposite directions as determined by inverter 14 circuit breaker 18 may be closed for energizing high-speed winding section 11 of the drum motor.
  • the laundering drum is thus made to rotate at the speed for spin-drying the laundry, as described in EP-A-0202 509, with a resultant increase of the pressure within the tub.
  • the laundering cycle then proceeds in the conventional manner, with circuit breakers 17 and 18 again opened and further reversals of the rotation of the drum at low speed, and with the possible intervention of further spin-drying phases similar to the one indicated at t2-t3.
  • the washing machine may be of the combined function type capable of selectively operating with two different liquid levels as described in the quoted EP-A-0202 509.
  • the machine At the lower liquid level the machine would then operate with recirculation of the liquid and periodic spin-drying phases during the laundering cycle; at the higher liquid level the machine would operate in the conventional manner by agitating the laundry with or without liquid recirculation, but in any case without the intervention of spin-drying phases during the laundering cycle.
  • control circuit is the advantageously designed as shown in fig. 3 by the provision of certain modifications of the circuit shown in fig. 1.
  • pressure switch 8 is in this case connected between pressure switch 4 and circuit breaekr 12, its movable contact 20 being directly connected to fixed contact 42 of pressure switch 4, while its fixed contact 82 is connected to circuit breaker 12.
  • fixed contact 81 of pressure switch 8 is connected respectively via further circuit breakers 22 and 23 to the junction between circuit breaker 7 and solenoid valve 9, and the junction between circuit breakers 12 and 17. Circuit breakers 22 and 23 are actuated by respective slow cams of the program unit.
  • Solenoid valve 19 is energized via pressure switch 4 and circuit breaker 7 to admit water to the tub until the liquid attains the lower level, at which point movable contact 9 of pressostat 4 is caused to close on fixed contact 42. Solenoid valve 19 thus continues to be energized via pressure switch 4, pressure switch 8 and circuit breaker 22 until the liquid attains the high level, causing movable contact 20 of pressure switch 8 to close on fixed contact 82. The eventual closing of circuit breakers 13 and 16 during this phase results in low-speed winding section 10 to be energized, whereupon the laundering operation proceeds in the known manner which needs not be described. It is noted in this contect that pressure switch 8 in this case carries out the conventional function of controlling the maximum level of the liquid admitted to the washing machine.
  • Solenoid valve 19 is actuated to admit water only until pressure switch 4 is actuated in response to detecting the "full" state; the laundering cycle then proceeds as already described with reference to fig. 1, that is, with recirculation of the laundering liquid to the interior of the drum and alternating rotation of the drum motor resulting from the simultaneous closing of circuit breakers 13 and 16.
  • the combined closing of circuit breakers 17 and 18 at instant t2 results in the intervention of a spin-drying phase t2-t3.
  • the laundering tub contains an amount of laundering liquid heated for instance to 60 °C, resulting in a pressure increase up to the value P2.
  • movable contact 20 of pressure switch 8 is caused to close on fixed contact 82 to thereby interrupt the energization of high-speed winding section 11 and thus terminate the spin-drying phase.
  • pressure switch 8 functions as a safety device effective to prevent the excessive formation of foam within the laundering tub to thus attain the stated object of the invention.
  • the control circuit shown in fig. 3 thus requires only a single pressure switch 8 connected in series to pressure switch 4 for performing the double function of a conventional control element for the admission of water to the higher level and of a safety device for preventing the excessive formation of foam. This eliminates the necessity of providing an additional component specifically for performing the safety function to attain the object of the invention.
  • washing machine may of course be variously modified within the purview of the invention.
  • Motor 10, 11 may thus be of any other type suitable for this purpose.
  • the program unit may similarly be of any other type to meet specific requirements.
  • the spin-drying phase, or phases, t2-t3 may intervene at any suitable time other than the laundry washing cycle under suitable control by the program unit.

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

Claims (3)

  1. Machine à laver automatique comprenant une cuve de lavage et un tambour monté dans cette cuve et adapté pour être entraîné en rotation par un moteur électrique pour effectuer au moins un cycle de lavage pendant lequel le linge est imprégné d'un liquide de lavage et le moteur fonctionne à une vitesse de rotation réduite, et au moins une phase intermédiaire pendant laquelle le moteur fonctionne à une vitesse d'essorage du linge, la machine à laver comprenant des moyens de commande (8) adaptés pour détecter la pression à l'intérieur de la cuve de lavage et pour arrêter la phase d'essorage (t2-t3) lorsque cette pression est supérieure à une valeur prédéterminée (P2) du fait d'une formation excessive de mousse a l'intérieur de la cuve de lavage.
  2. Machine à laver automatique selon la revendication 1, caractérisée en ce que les moyens de commande comprennent au moins un premier manocontact (8) monté en série avec le moteur électrique (11) et comportant un contact électrique normalement fermé (20) adapté pour s'ouvrir lorsque la pression à l'intérieur de la cuve de lavage est supérieure à la valeur prédéterminée (P2).
  3. Machine à laver automatique selon la revendication 2, caractérisée en ce que le contact mobile (20) du premier manocontact (8) est normalement également relié en série à une électrovanne d'alimentation en eau (19), un deuxième manocontact (4) ayant un contact mobile (9) normalement relié en série à l'électrovanne (19) et adapté pour être relié en série au contact mobile (20) du premier manocontact (8)d'une manière connue en soi, lorsque la pression atteint une valeur prédéterminée inférieure à cette valeur prédéterminée (P2).
EP86115826A 1985-11-27 1986-11-14 Machine à laver automatique à tambour rotatif Expired - Lifetime EP0224776B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86115826T ATE64632T1 (de) 1985-11-27 1986-11-14 Automatische waschmaschine mit drehender trommel.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT4575185 1985-11-27
IT45751/85A IT1187301B (it) 1985-11-27 1985-11-27 Lavatrice automatica a tamburo rotante

Publications (3)

Publication Number Publication Date
EP0224776A2 EP0224776A2 (fr) 1987-06-10
EP0224776A3 EP0224776A3 (en) 1988-03-02
EP0224776B1 true EP0224776B1 (fr) 1991-06-19

Family

ID=11258053

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86115826A Expired - Lifetime EP0224776B1 (fr) 1985-11-27 1986-11-14 Machine à laver automatique à tambour rotatif

Country Status (4)

Country Link
EP (1) EP0224776B1 (fr)
AT (1) ATE64632T1 (fr)
DE (1) DE3679889D1 (fr)
IT (1) IT1187301B (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK2246469T3 (da) * 2010-02-16 2012-08-06 V Zug Ag Fremgangsmåde til drift af en vaskemaskine og vaskemaskine med cirkulationspumpe og centrifugeringsfase

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0202509A2 (fr) * 1985-05-24 1986-11-26 INDUSTRIE ZANUSSI S.p.A. Dispositif de commande pour machine à laver le linge

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1123515A (fr) * 1954-05-07 1956-09-24 Dispositif électrique pour machines à laver pour empêcher une formation trop intense de mousse dans le cas d'une concentration trop forte en produit de lavage
DE1610030A1 (de) * 1965-12-07 1970-07-16 Siemens Elektrogeraete Gmbh Einrichtung zum Verhindern des UEberkochens
DE2325586A1 (de) * 1973-05-19 1974-12-05 Miele & Cie Wasch- oder geschirrspuelmaschine mit einer einrichtung zur vermeidung des ueberschaeumens
IT1174953B (it) * 1983-12-06 1987-07-01 Zanussi A Spa Industrie Macchina lavabiancheria
NZ207319A (en) * 1984-02-29 1988-02-12 Fisher & Paykel Clothes washing machine, control of spin cycle and of washing during water entry

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0202509A2 (fr) * 1985-05-24 1986-11-26 INDUSTRIE ZANUSSI S.p.A. Dispositif de commande pour machine à laver le linge

Also Published As

Publication number Publication date
IT1187301B (it) 1987-12-23
EP0224776A3 (en) 1988-03-02
ATE64632T1 (de) 1991-07-15
DE3679889D1 (de) 1991-07-25
IT8545751A0 (it) 1985-11-27
EP0224776A2 (fr) 1987-06-10

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