EP0224145A2 - Machine à laver automatique à tambour rotatif - Google Patents

Machine à laver automatique à tambour rotatif Download PDF

Info

Publication number: EP0224145A2
Authority: EP; European Patent Office
Prior art keywords: motor; spin; speed; washing machine; laundry
Prior art date: 1985-11-27
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.): Granted

Application number

EP86115827A

Other languages

German (de)

English (en)

Other versions

EP0224145A3 (en

EP0224145B1 (fr

Inventor

Francesco Nodassi

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

Zanussi Elettrodomestici 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.)

1985-11-27

Filing date

1986-11-14

Publication date

1987-06-03

1986-11-14 Application filed by Industrie Zanussi SpA, Zanussi Elettrodomestici SpA filed Critical Industrie Zanussi SpA

1986-11-14 Priority to AT86115827T priority Critical patent/ATE72844T1/de

1987-06-03 Publication of EP0224145A2 publication Critical patent/EP0224145A2/fr

1988-03-02 Publication of EP0224145A3 publication Critical patent/EP0224145A3/en

1992-02-26 Application granted granted Critical

1992-02-26 Publication of EP0224145B1 publication Critical patent/EP0224145B1/fr

Status Expired 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

Definitions

the present invention relates to an automatic washing machine of the type designed to carry out laundry washing phases and spin-drying phases by the use of a rotatable drum containing the laundry.
a laundry washing machine in which the washing liquid collected on the bottom of the laundering tub is recirculated to the interior of a rotatable drum to be absorbed by the laundry therein.
the drum may be rotated at the spin-drying speed for periodically recurring short intervals to the purpose of extracting from the laundry a sufficient amount of the laundering liquid for the operation of the washing liquid recirculation pump.
the 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.
the periodic spin-drying phases may give rise, particularly when their duration and/or the rotational speed of the drum exceeds a certain value, to the formation of an excessive amount of foam within the tub, such foam tending to escape from the machine for example through the detergent distributor.
This troublesome phenomenon may occur with relative facility as a result of tolerances of the components of the machine and of the variability of certain parameters such as the size of the laundry charge.
an automatic washing machine comprising a tub and a drum mounted therein for being rotated by a controlled electric motor for carrying out at least one laundry washing phase during which the laundry is soaked with the laundering liquid and the motor operates at a reduced laundering speed.
the washing machine is mainly characterized by comprising control means adapted to detect the rotational speed of the motor and to deenergize the motor when the spin-drying speed exceeds a predetermined value.
the washing machine comprises as an essential component an electric motor 3, for example of the universal type, for rotating the laundering drum (not shown) of the machine.
Motor 3 is energized through a normally closed controlled breaker switch 4 from the two output terminals 5 and 6 of a control unit 7.
the latter is adapted to control the speed of motor 3, for example by varying the phase or frequency of the voltage appearing at output terminals 5 and 6, in response to a first control signal applied to a first input terminal 8 by a program unit 9 of the machine, and to a second control signal applied to a second input terminal 10.
Control unit 7 has two additional terminals 11 and 12 connected to the electric supply mains, and is of a substantially conventional type comprising for instance an integrated circuit TDA 1085 supplied by Motorola Inc..
Program unit 9 is similarly of a conventional type, and the controlled breaker switch 4 may for instance be of the TRIAC type.
a device preferably a tachymetric generator 13, adapted to generate at an output terminal 14 a DC or AC voltage in proportion to the rotational speed of the motor.
Output terminal 14 is connected to input terminal 10 of control unit 7, and in addition to the inverting input of a comparator 15 (for instance an operational amplifyer) the non-inverting input of which has a reference voltage V applied thereto.
the output terminal of comparator 15 is connected to the control input terminal of breaker switch 4 for causing the latter to open in the per se known manner when the voltage at output terminal 14 of tachymetric generator 13 is higher than the reference voltage V.
the reference voltage is calculated so as to represent a predetermined rotational speed of motor 3 and thus, taking into consideration the transmission ratio, a predetermined spin-drying speed of the drum of the machine.
control unit 7 In accordance with the program stored in program unit 9, control unit 7 generates at its output terminals 5 and 6 a voltage of a phase or frequency causing motor 3 to rotate at a speed corresponding to a rotational speed of the washing drum of for example 50 rpm, with the conventional inversions of the sense of rotation of the drum and intervening rest periods, the tub of the machine containing a laundering liquid during this period.
the drum of the washing machine rotates at the laundering speed in one direction for a period t0 - t1, and after a reat period t1-t2, in the opposite sense for a period t2-t3.
control unit 7 energizes motor 3 to operate at the spin-drying speed for a preselected duration t4-t7 in a similar manner as described in the patent application no. 45715 A/85 cited above.
rotation of the drum is thus started at t4 with a relatively low acceleration for uniform distribution of the laundry within the drum.
the spin-drying phase proper is initiated at t5 with a sudden increase of the speed of the drum so as to attain a predetermined rotational speed n2 of for instance 400 rpm at t6 (after about two min.).
the tachymetric generator 13 generates at its output terminal 14 a voltage identical to reference voltage V.
comparator 15 generates an output control signal adapted not only to terminate the spin-drying phase by the action of control unit 7 in a per se known manner, but also to cause breaker switch 4 to open immediately.
motor 3 thus abruptly deenergized , so that its rotational speed drops to approximately zero at t7.
the laundering cycle then preoceeds in the previously described manner, with further phases of rotation of the drum at the speed n1, interrupted by rest periods. It is also possible to provide further periodically recurring spin-drying cycles as described with referecne to the period t4-t7.
comparator 5 and/or controlled breaker switch 4 may thus be of a different type; in addition, the periods of rotation and the rest periods of the drum during a laundering cycle may be variously modified, it being also possible to provide any number of periodic spin-drying phases analogous to the period t4-t7.
a further modification may consist in the provision that the output of comparator 15 may be applied to a corresponding input of control unit 7, as will be readily evident to one skilled in the art. In this case the operation of breaker switch 4 is directly controlled by control unit 7.
control means 13, 14, 15 and breaker switch 4 may finally be employed for limiting the maximum rotational speed of the drum during the final spin-drying cycle when there is no detergent in the laundering tub.

Landscapes

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

EP86115827A 1985-11-27 1986-11-14 Machine à laver automatique à tambour rotatif Expired EP0224145B1 (fr)

Priority Applications (1)

Application Number	Priority Date	Filing Date	Title
AT86115827T ATE72844T1 (de)	1985-11-27	1986-11-14	Automatische waschmaschine mit drehender trommel.

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
IT45750/85A IT1202242B (it)	1985-11-27	1985-11-27	Lavatrice automatica a tamburo rotante
IT4575085		1985-11-27

Publications (3)

Publication Number	Publication Date
EP0224145A2 true EP0224145A2 (fr)	1987-06-03
EP0224145A3 EP0224145A3 (en)	1988-03-02
EP0224145B1 EP0224145B1 (fr)	1992-02-26

Family

ID=11258045

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP86115827A Expired EP0224145B1 (fr)	1985-11-27	1986-11-14	Machine à laver automatique à tambour rotatif

Country Status (4)

Country	Link
EP (1)	EP0224145B1 (fr)
AT (1)	ATE72844T1 (fr)
DE (1)	DE3683989D1 (fr)
IT (1)	IT1202242B (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
GB656439A (en) *	1948-01-13	1951-08-22	British Thomson Houston Co Ltd	Improvements in and relating to methods of operating spinner type washing machines to prevent suds lock
DE1585731B2 (de) *	1967-02-22	1972-05-31	Holzer, Walter, 7758 Meersburg	Programmwahleinrichtung fuer automatische waschmaschinen
EP0090716B1 (fr) *	1982-03-26	1986-02-26	Esswein S.A.	Lave-linge à moteur d'entraînement du tambour de puissance réduite
IT1174953B (it) *	1983-12-06	1987-07-01	Zanussi A Spa Industrie	Macchina lavabiancheria

1985
- 1985-11-27 IT IT45750/85A patent/IT1202242B/it active
1986
- 1986-11-14 AT AT86115827T patent/ATE72844T1/de not_active IP Right Cessation
- 1986-11-14 EP EP86115827A patent/EP0224145B1/fr not_active Expired
- 1986-11-14 DE DE8686115827T patent/DE3683989D1/de not_active Expired - Fee Related

Also Published As

Publication number	Publication date
IT1202242B (it)	1989-02-02
DE3683989D1 (de)	1992-04-02
EP0224145A3 (en)	1988-03-02
ATE72844T1 (de)	1992-03-15
EP0224145B1 (fr)	1992-02-26
IT8545750A0 (it)	1985-11-27

Legal Events

Date	Code	Title	Description
1987-04-17	PUAI	Public reference made under article 153(3) epc to a published international application that has entered the european phase	Free format text: ORIGINAL CODE: 0009012
1987-06-03	AK	Designated contracting states	Kind code of ref document: A2 Designated state(s): AT BE CH DE FR GB IT LI LU NL SE
1988-01-12	PUAL	Search report despatched	Free format text: ORIGINAL CODE: 0009013
1988-01-20	RAP1	Party data changed (applicant data changed or rights of an application transferred)	Owner name: INDUSTRIE ZANUSSI S.P.A.
1988-03-02	AK	Designated contracting states	Kind code of ref document: A3 Designated state(s): AT BE CH DE FR GB IT LI LU NL SE
1988-09-07	17P	Request for examination filed	Effective date: 19880706
1990-08-22	17Q	First examination report despatched	Effective date: 19900712
1991-05-22	ITF	It: translation for a ep patent filed
1992-01-10	GRAA	(expected) grant	Free format text: ORIGINAL CODE: 0009210
1992-02-26	AK	Designated contracting states	Kind code of ref document: B1 Designated state(s): AT BE CH DE FR GB IT LI LU NL SE
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1992-02-26	REF	Corresponds to:	Ref document number: 72844 Country of ref document: AT Date of ref document: 19920315 Kind code of ref document: T
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1992-08-17	NLV1	Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
1992-11-30	PG25	Lapsed in a contracting state [announced via postgrant information from national office to epo]	Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19921130
1992-12-29	PLBE	No opposition filed within time limit	Free format text: ORIGINAL CODE: 0009261
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1993-02-17	26N	No opposition filed
1995-01-31	EAL	Se: european patent in force in sweden	Ref document number: 86115827.7
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