EP0224145B1 - Automatische Waschmaschine mit drehender Trommel - Google Patents

Automatische Waschmaschine mit drehender Trommel Download PDF

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Publication number
EP0224145B1
EP0224145B1 EP86115827A EP86115827A EP0224145B1 EP 0224145 B1 EP0224145 B1 EP 0224145B1 EP 86115827 A EP86115827 A EP 86115827A EP 86115827 A EP86115827 A EP 86115827A EP 0224145 B1 EP0224145 B1 EP 0224145B1
Authority
EP
European Patent Office
Prior art keywords
motor
spin
speed
washing machine
drying
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
Application number
EP86115827A
Other languages
English (en)
French (fr)
Other versions
EP0224145A2 (de
EP0224145A3 (en
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
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 AT86115827T priority Critical patent/ATE72844T1/de
Publication of EP0224145A2 publication Critical patent/EP0224145A2/de
Publication of EP0224145A3 publication Critical patent/EP0224145A3/en
Application granted granted Critical
Publication of EP0224145B1 publication Critical patent/EP0224145B1/de
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 a program operated washing machine according to the precharacterizing clause of claim 1.
  • a washing machine of this general type is known from EP-A1-0090716.
  • EP-A1-0090716 describes a washing machine which includes a control circuit to compare a signal related to the nominal speed of the drum with a tachygraph signal which indicates the actual speed of the drum. A difference in the signals due to slowing of the drum by an overload is converted to a phase angle differential which upon reaching a certain value operates upon a switch circuit to stop the motor.
  • GB-A-656 439 describes a laundry washing machine in which the dry spinning cycle following a washing cycle is interrupted after a predetermined time interval before it has reached its full operating speed. After this interruption of the dry spinning cycle, the drain pump is kept operative to draw suds from the space between the spin basket and the tub. Only for the next dry spinning cycle may the spinning speed obtain its full 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 rest 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.
  • 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.).
  • n2 for instance 400 rpm at t6
  • 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 is thus abruptly deenergized, so that its rotational speed drops to approximately zero at t7.
  • the laundering cycle then proceeds 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.
  • the automatic washing machine according to the invention may of course undergo numerous modifications without thereby leaving the scope of the invention.
  • 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.

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

Claims (3)

  1. Programmierbare Waschmaschine, mit einem Behälter mit drehbarer Trommel, einem Elektromotor (3) zum Antrieb der Trommel, einer Detektoreinrichtung (13) zum Feststellen der momentanen Drehgeschwindigkeit, und Steuereinrichtungen (4,7,15) zum Antrieb des Motors (3) mit wählbaren Geschwindigkeitswerten, nämlich einer normalen Waschgeschwindigkeit, die in Waschzyklen verwendet wird und einer erhöhten Schleudergeschwindigkeit, die in Schleuderzyklen verwendet wird,

    dadurch gekennzeichnet, daß die Maschine wenigstens einen Schleuderzyklus zwischen zwei aufeinanderfolgenden Waschphasen in einem Waschzyklus ausführt,

    daß der Schleuderzyklus eine vorgegebene Zeitdauer hat,

    daß die Detektor- und Steuereinrichtungen (4,13,14,15) derart ausgebildet sind, daß sie den Motor (3) für die restliche Zeitdauer des Schleuderzyklusses abschalten, wenn eine Drehgeschwindigkeit innerhalb des Schleuderzyklusses festgestellt wird, welche über einem vorgegebenen Geschwindigkeitswert (n2) liegt.
  2. Waschmaschine nach Anspruch 1, dadurch gekennzeichent, daß der Motor (3) an die Steuerspannungsversorgung (5, 6) über einen normalerweise geschlossenen steuerbaren Schalter (4) angeschlossen ist, welcher weiterhin an die Steuereinrichtung (15) angeschlossen ist, die geöffnet wird, wenn der vorgegebene Geschwindigkeitswert (n2) durch die Detektoreinrichung (13) festgestellt wird.
  3. Waschmaschine nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Detektoreinrichtung einen Tacho-Generator (13) aufweist, der durch den Motor (3) angetrieben wird und welcher ein Steuersignal abgibt, welches proportional der Drehgeschwindigkeit des Motors (3) ist und dessen Ausgang den Schalter (4) steuert.
EP86115827A 1985-11-27 1986-11-14 Automatische Waschmaschine mit drehender Trommel Expired EP0224145B1 (de)

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 EP0224145A2 (de) 1987-06-03
EP0224145A3 EP0224145A3 (en) 1988-03-02
EP0224145B1 true EP0224145B1 (de) 1992-02-26

Family

ID=11258045

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86115827A Expired EP0224145B1 (de) 1985-11-27 1986-11-14 Automatische Waschmaschine mit drehender Trommel

Country Status (4)

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

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 (de) * 1982-03-26 1986-02-26 Esswein S.A. Waschmaschine mit Trommelantriebsmotor von verringerter Leistung
IT1174953B (it) * 1983-12-06 1987-07-01 Zanussi A Spa Industrie Macchina lavabiancheria

Also Published As

Publication number Publication date
EP0224145A2 (de) 1987-06-03
IT1202242B (it) 1989-02-02
IT8545750A0 (it) 1985-11-27
DE3683989D1 (de) 1992-04-02
EP0224145A3 (en) 1988-03-02
ATE72844T1 (de) 1992-03-15

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