EP0387942A1 - Procédé et dispositif pour arrêter en position de chargement le tambour d'une machine à laver à chargement par le dessus - Google Patents

Procédé et dispositif pour arrêter en position de chargement le tambour d'une machine à laver à chargement par le dessus Download PDF

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Publication number
EP0387942A1
EP0387942A1 EP90200527A EP90200527A EP0387942A1 EP 0387942 A1 EP0387942 A1 EP 0387942A1 EP 90200527 A EP90200527 A EP 90200527A EP 90200527 A EP90200527 A EP 90200527A EP 0387942 A1 EP0387942 A1 EP 0387942A1
Authority
EP
European Patent Office
Prior art keywords
drum
tub
branch
electric motor
relay
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.)
Withdrawn
Application number
EP90200527A
Other languages
German (de)
English (en)
Inventor
Pierangelo C/O Int. Octrooibureau B.V. Maineri
Leonardo C/O Int. Octrooibureau B.V. Pavani
Ruggero C/O Int. Octrooibureau B.V. Bocchini
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.)
IRE Industrie Riunite Eurodomestici SpA
Whirlpool Europe BV
Original Assignee
IRE Industrie Riunite Eurodomestici SpA
Whirlpool Europe BV
Whirlpool International BV
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 IRE Industrie Riunite Eurodomestici SpA, Whirlpool Europe BV, Whirlpool International BV filed Critical IRE Industrie Riunite Eurodomestici SpA
Publication of EP0387942A1 publication Critical patent/EP0387942A1/fr
Withdrawn legal-status Critical Current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 
    • D06F37/302—Automatic drum positioning

Definitions

  • This invention relates to a top-loading washing machine comprising a housing provided with a top door, a tub provided with a loading aperture to which access is prevented by said door and containing a rotary drum also provided with a door for access to its interior, an electric motor preferably of direct current (d.c.) permanent magnet type, arranged to operate said drum so as to cause it to rotate within the tub, and a programmer for controlling the various preset operating stages of the washing machine.
  • Said machine is also provided with a timed delay means which prevents the housing door being opened for a determined time after the washing machine has stopped at the end of the selected wash cycle or after the washing machine has been halted by the user during this cycle.
  • An object of the present invention is therefore to offer a method by which a user, after stoppage of the washing machine on termination of a wash cycle or during any stage thereof, can gain easy access to the interior of the washing machine drum without having to move the drum.
  • a further object of the present invention is to provide a washing machine having a device which enables the drum, after the machine has stopped, to halt in a position such that its door corresponds with the tub loading aperture.
  • a method for locking in a suitable position the drum of a top-loading washing machine comprising a housing provided with a top door, a tub provided with a loading aperture to which access is prevented by said door and containing a rotary drum also provided with a door for access to its interior, said position being such that the tub aperture corresponds with the door of the rotary drum, said washing machine also comprising an electric motor preferably of direct current permanent magnet type which via a normal transmission member drives the drum such that it rotates within the tub, said method comprising a succession of stages in which:
  • Said method is implemented by a device applied to the washing machine of the aforesaid type, comprising means for causing the motor to operate at low speed, presence sensing means comprising a fixed part and a mobile part associated rigidly with the drum, and means arranged to short-circuit the motor so halting its rotation during said stage of low speed operation.
  • the tub 4 conventionally comprises a loading aperture 10, a usual door 11 also being provided on the drum 5.
  • the washing machine 1 (see Figure 2) is provided with a usual programmer or timer 12 and a usual timed delay means (represented by simplicity as a switch and indicated by 13 in said Figure 2) which in known manner keeps the door 3 locked against opening for a predetermined time after the washing machine has stopped at the end of the wash cycle or after it has been halted by the user during said cycle.
  • a usual programmer or timer 12 and a usual timed delay means (represented by simplicity as a switch and indicated by 13 in said Figure 2) which in known manner keeps the door 3 locked against opening for a predetermined time after the washing machine has stopped at the end of the wash cycle or after it has been halted by the user during said cycle.
  • the programmer 12 and delay means 13 are connected into an operation command circuit 14 for the motor 6, which also comprises a command module 15 which in known manner controls the energisation mode of said motor during the various operating stages of the washing machine 1.
  • the module 15 is controlled through a control line 15A by the timer or programmer 15 which can also form part of the command module.
  • the washing machine after any stoppage of its operation (either at the end of the wash cycle or during the cycle itself), provides for operating the motor 6 for a short time in order to bring the door 11 of the drum 5 into a position corresponding with the loading aperture 10 in the tub 4.
  • the command circuit 14 of the machine 1 is provided with a circuit part or control circuit 16 operationally connected to presence sensor means 17 disposed on the outside of the tub 4.
  • Said sensor means 17 comprise (see Figure 1) a known presence sensor 18, for example an inductive proximity sensor, fixed in any known manner to a side 4A of the tub 4, and an element 19 such as a metal plate rigid with the pulley 8.
  • control circuit 16 is shown also incorporating the command module 15 connected in any manner to the presence sensor 18. This connection is shown by dashed lines 60 and 61 in Figure 2.
  • the command circuit 14 comprises two circuit branches 20 and 21 carrying the two alternating mains voltage phases V A .
  • This voltage is made into d.c. voltage by a usual rectifier (not shown) before it reaches the terminals of the d.c. motor 6.
  • the timer 12 is connected to said branches 20 and 21 (known hereinafter as the main lines) via the branches 12A and 12B.
  • Two mobile contacts 22 and 23 act on the main lines 20 and 21 under the control of a usual switch or pushbutton 24 positioned for example on the face of the washing machine housing 2.
  • the various components of the command circuit 14 are powered by closing said mobile contacts 22 and 23, power being removed on opening them.
  • a relay 28 is connected to said lines 20 and 21, namely at nodes 26 and 27 thereof, whereas the module 15 is connected to nodes 29 and 30, and is also connected via branches 31 and 32 to the terminals of the d.c. motor 6.
  • the (door opening) delay means 13 which in known manner can be a catch operated by a bimetallic strip heated by an electrical resistance element, is connected to the line 21.
  • Said module 15 also receives a line 42, comprising two mobile contacts 38B and 28B, which commences upstream of the mobile contact 22 at a node 43 located in the line 20 upstream of the mobile contact 22.
  • the lines 37 and 42 will be known hereinafter as branch lines.
  • the mobile contacts 38A and 38B are operated by a relay 38 connected to the branch line 42 upstream of the mobile contact 38B via a branch 44, and to the line 21 via a branch 45.
  • the branch 44 comprises one mobile contact 28D whereas the branch 45 comprises two mobile contacts 46A, of delayed opening, and 28C.
  • the first of these latter contacts is operated by a relay 46, and the second together with the contact 28D of the branch 44 is operated by the relay 28 which also operates the mobile contacts 28A and 28B.
  • the opening (or closure) of the mobile contact 28D is delayed with respect to the opening and closure of said contact 28C, the contacts 28A and 28B also advantageously being of delayed closure.
  • a further self-maintaining contact 38C is connected into a branch 47 in parallel with the mobile contact 28C and is also operated by the relay 38.
  • the relay 46 is connected via branches 48 and 49 to the command module 15 from which it is powered when this latter is itself powered through the branch lines 37 and 42. Said relay 46 operates a mobile contact 46B provided in a branch 50 running parallel to the electric motor 6.
  • branch 49 connects the relay 46 to a power line (not shown) connected to the presence sensor 18 which as stated is connected to the command module 15.
  • the presence sensor operates on the branch 49 to enable the relay 46 to be powered, as explained hereinafter, in order to arrest the movement of the motor 6 when desired.
  • the user halts the operation of the washing machine by operating the switch 24 so as to open the mobile contacts 22 and 23. If the machine has reached the end of the wash cycle, this operation of the pushbutton can be advantageously done automatically in known manner by the timer 12.
  • the door 11 of the drum 5 can be in any position relative to the loading aperture 10 of the tub 4. It will be assumed that these positions do not correspond so that the user is unable to gain easy access to the interior of said drum. On opening the contacts 22 and 23 there is a consequent lack of power in the main lines 20 and 21 of the circuit 14.
  • the relay 28 As there is on power in the lines 20 and 21 downstream of the contacts 22 and 23, the relay 28 is de-energized and closes the mobile contacts 28A and 28B with a delay, whereas it opens the mobile contact 28C.
  • the mobile contact 28D opens with delay while keeping the relay 38 energized by the power reaching it via the branches 44 and 47.
  • the delay in the closure of the mobile contacts 28A and 28B is chosen advantageously such as to enable the motor 6 to stop completely (so that the drum 5 also stops) when the switch 24 is opened during a usual wash cycle of the washing machine.
  • the closure of the mobile contacts 28B and 28A causes the command module to receive power via the branch lines 37 and 42.
  • the module 15 acts on the motor 6 to rotate it slowly.
  • the motor 6 rotates the pulley 8 by means of the belt 9.
  • This rotation of the pulley 8 (and thus of the drum 5) takes place at a (low) speed substantially close to that of the wash stage.
  • the element 19 passes in front of the presence sensor 18 which as a result of this "presence sensing" feeds a signal to the module 15 and thus, for the aforesaid reasons, to the relay 46 via the branch 49. It should be noted that the "presence sensing” takes place only during this low-speed rotation of the pulley 8 and does not take place during any other stage of operation of the washing machine 1.
  • the relay 46 is therefore powered via the branch 49 and branch 48 from the module 15.
  • This relay therefore opens the mobile contact 46A with a delay and, importantly, more or less instantaneously closes the mobile contact 46B in the branch 50 in parallel with the motor 6, so short-circuiting it.
  • This short-circuiting substantially instantaneously nullifies the counter-electromotive force of the motor in the presence of a magnetic field generated by the permanent magnets of the motor 6 itself, so blocking the motor and consequently the rotation of the pulley 8 and drum 5.
  • the practically instantaneous blockage of the motor 6 due to the presence of said element 19 in front of the sensor 18 causes the drum 5 to stop in a position such that its door 11 corresponds with the loading aperture 10 in the tub 4.
  • the relay 38 is de-energized to open the contacts 38A and 38B and thus interrupt the power supply to the module. It should be noted that the delay with which the contact 46A opens is less than the time during which the door opening delay means 13 prevents access to the washing machine tub. Furthermore, the delayed opening of the contact 46A can take place either simultaneously with or before the delayed opening of the contact 28D, which advantageously opens before the door opening delay means 13 allows the user to gain access to the tub.
  • the delay-operated contact 28D is not operated by the relay 28 but by the door opening delay means 13 itself. In this manner, when this allows the washing machine door to be opened it opens the contact 28D so that no member is electrically live.
  • the mobile contact 28D is not of delayed opening but instead is operated by the relay 28 in such a manner as to open instantaneously with the contact 28C.
  • the branch 44 connecting the contact 28D to the relay 38 is connected to the branch line 42 at two separate points, one upstream and one downstream of the mobile contact 38B.
  • the relay 28 On opening the switch 24 the relay 28 is de-energized to immediately open the mobile contact 28D. However, the relay 38 remains energized because it is connected (as already described) to the main line 21 through the branch 45 and to the main line 20 through that part of the line 42 comprising the mobile contact 38B (closed), and the branch 44. In this manner current can flow along the branch lines 37 and 42 to power the module 15 with the aforesaid consequences.
  • washing machine 1 If the washing machine 1 is halted during a wash cycle for the purpose of placing further articles into its drum 5 for washing, the user having done this closes the door 11 of the drum 5 and then closes the door 3, after which he operates the switch 24 to return power to the main lines 20 and 21 of the circuit 14. In this manner the washing machine returns to operation to complete the wash cycle. It should be noted that after the motor 6 has stopped and the contacts 38A and 38B have opened the relay is de-­energized. Consequently the mobile contact 46B is open to remove the short-circuit from the motor 6 and allow it to re-operate.
  • the method according to the invention and a washing machine 1 constructed in accordance with the present invention obviate the aforesaid drawbacks of top-loading washing machines of the state of the art.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
EP90200527A 1989-03-13 1990-03-07 Procédé et dispositif pour arrêter en position de chargement le tambour d'une machine à laver à chargement par le dessus Withdrawn EP0387942A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8919742A IT1228362B (it) 1989-03-13 1989-03-13 Metodo e dispositivo per il bloccaggio in posizione opportuna del cestello di una macchina lavabiancheria del tipo a carica dall'alto.
IT1974289 1989-03-13

Publications (1)

Publication Number Publication Date
EP0387942A1 true EP0387942A1 (fr) 1990-09-19

Family

ID=11160845

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90200527A Withdrawn EP0387942A1 (fr) 1989-03-13 1990-03-07 Procédé et dispositif pour arrêter en position de chargement le tambour d'une machine à laver à chargement par le dessus

Country Status (2)

Country Link
EP (1) EP0387942A1 (fr)
IT (1) IT1228362B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4109541A1 (de) * 1991-03-22 1992-09-24 Bosch Siemens Hausgeraete Anordnung eines signalgebers fuer die waeschetrommel einer haushalts-waschmaschine
EP0754797A1 (fr) * 1995-07-21 1997-01-22 Esswein S.A. Procédé de positionnement à l'arrêt d'une pièce rotative mue par un moteur universel, en particulier du tambour d'une machine à laver à chargement par le dessus, et dispositif de mise en oeuvre
CN110195316A (zh) * 2018-02-26 2019-09-03 青岛海尔洗衣机有限公司 顶开式衣物处理设备及其内筒盖操作系统

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112779719A (zh) * 2019-11-01 2021-05-11 佛山市云米电器科技有限公司 一种洗衣机的减速方法、系统、存储介质及洗衣机

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2296719A1 (fr) * 1974-12-30 1976-07-30 Chalectro Cie Machines Laver L Machine a laver le linge
FR2300837A2 (fr) * 1975-02-11 1976-09-10 Chalectro Machines Machine a laver le linge
FR2522343A1 (fr) * 1982-02-26 1983-09-02 Thomson Brandt Machine lave-linge

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2296719A1 (fr) * 1974-12-30 1976-07-30 Chalectro Cie Machines Laver L Machine a laver le linge
FR2300837A2 (fr) * 1975-02-11 1976-09-10 Chalectro Machines Machine a laver le linge
FR2522343A1 (fr) * 1982-02-26 1983-09-02 Thomson Brandt Machine lave-linge

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4109541A1 (de) * 1991-03-22 1992-09-24 Bosch Siemens Hausgeraete Anordnung eines signalgebers fuer die waeschetrommel einer haushalts-waschmaschine
EP0754797A1 (fr) * 1995-07-21 1997-01-22 Esswein S.A. Procédé de positionnement à l'arrêt d'une pièce rotative mue par un moteur universel, en particulier du tambour d'une machine à laver à chargement par le dessus, et dispositif de mise en oeuvre
FR2736943A1 (fr) * 1995-07-21 1997-01-24 Esswein Sa Procede de positionnement a l'arret d'une piece rotative mue par un moteur universel, en particulier du tambour d'une machine a laver a chargement par le dessus, et dispositif de mise en oeuvre
CN110195316A (zh) * 2018-02-26 2019-09-03 青岛海尔洗衣机有限公司 顶开式衣物处理设备及其内筒盖操作系统
CN110195316B (zh) * 2018-02-26 2021-07-06 重庆海尔洗衣机有限公司 顶开式衣物处理设备及其内筒盖操作系统

Also Published As

Publication number Publication date
IT8919742A0 (it) 1989-03-13
IT1228362B (it) 1991-06-14

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