EP0709511A1 - Stoppositionierungsvorrichtung der Trommel einer Waschmaschine oder eines Trockners - Google Patents

Stoppositionierungsvorrichtung der Trommel einer Waschmaschine oder eines Trockners Download PDF

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Publication number
EP0709511A1
EP0709511A1 EP95402345A EP95402345A EP0709511A1 EP 0709511 A1 EP0709511 A1 EP 0709511A1 EP 95402345 A EP95402345 A EP 95402345A EP 95402345 A EP95402345 A EP 95402345A EP 0709511 A1 EP0709511 A1 EP 0709511A1
Authority
EP
European Patent Office
Prior art keywords
drum
wave
network
time
motor
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.)
Ceased
Application number
EP95402345A
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English (en)
French (fr)
Inventor
Michel Chalmandrier
François Garofalo
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.)
Compagnie Industrielle dAppareils Menagers SA CIAPEM
Original Assignee
Compagnie Industrielle dAppareils Menagers SA CIAPEM
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 Compagnie Industrielle dAppareils Menagers SA CIAPEM filed Critical Compagnie Industrielle dAppareils Menagers SA CIAPEM
Publication of EP0709511A1 publication Critical patent/EP0709511A1/de
Ceased 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

  • the present invention relates to a device for stopping the drum of a washing machine or dryer. It applies in particular to washing machines or dryers with top loading so that at the end of rotation of their drum, the opening of the latter corresponds to the opening of the machine, thus facilitating unloading the laundry, avoiding turning the drum with your hands until it meets its opening.
  • a first solution then consists in abruptly stopping the rotation of the drum when the marks detect that its opening coincides or almost coincides with the opening of the washing machine.
  • a significant inertial shock occurs, detrimental to the proper functioning of the machine and also to the laundry it contains.
  • a more appropriate solution requires a gradual slowdown of the drum before it comes to a complete stop.
  • One sensor being placed in a fixed position on the machine and the other being integral with the drum, as soon as the two sensors coincide, the order to stop the drum drive motor is for example given after a first time. t1 corresponding, at a given and well-defined angle ⁇ made by the opening of the drum with the opening of the machine, the speed of rotation of the drum being known. From this time t1, the drum slows down. Knowing the friction torques, we can deduce the decreasing speed of the drum and therefore the second time t2 where the two openings will coincide. At this instant, the drum is stopped suddenly, for example by sending a direct current in its drive motor. This sudden stop does not cause an inertial shock because of the low speed of rotation of the drum at the time of the stop.
  • a disadvantage of this solution is that if the rotation of the drum is well controlled until the first instant t1, thanks to the exact knowledge of the speed of rotation, it is not the same for the control of the path between the first instant t1 and the second instant t2, in particular for lack of sufficient knowledge of the friction couples. Thus, even if these are perfectly determined in the manufacture of a machine, they inevitably evolve over time. he then occurs a drift in time of the positioned stop of the drum, to the point that the opening of the latter ends up no longer coinciding with the opening of the machine.
  • the object of the invention is in particular to allow a positioned stop of a washing machine or dryer drum, which does not drift over time, without causing damage in particular to the linen or to the appliances.
  • the subject of the invention is a device for stopping the drum of a washing machine or dryer, characterized in that it comprises means for locating a given position of the drum following a command d stopping, means for controlling the voltage wave supplying the drum drive motor from the wave of the electrical supply network of nominal frequency fo and stopping means, the control means eliminating half-wave of the network wave after a first predetermined time t1 so as to obtain a first supply wave of frequency fo / n, the first time t1 being counted from the given position of the drum, then the control means suppressing half-waves of the network wave after a second predetermined time t2 so as to obtain a second supply wave of frequency fo / m, n and m being whole numbers greater than 1 , the second feed wave With less half-waves removed than the first so as to transmit more energy than the latter, the stop means stopping the drum drive motor after a third predetermined time t3.
  • the main advantages of the invention are that it does not require complicated adjustment, that it allows a reproducible adjustment from one machine to another and that it is simple to implement.
  • FIG 1 shows schematically a drum 1 of washing machine inside the tank 2 of the device.
  • this tank 2 does not exist.
  • the drum stop 1 must be positioned so that its opening coincides, for example, with the opening 3 of the tank 2. In this case, unloading the laundry is facilitated since it does not require to make the effort to turn the drum until its opening appears. This also prevents injuries likely to be caused by this manipulation.
  • the device according to the invention comprises for example a first sensor 4 fixed relative to the tank 2 and a second sensor 5 linked to the drum 1. These sensors are in particular part of means for locating at least a given position of the drum relative to the tank or at a fixed mark on the appliance.
  • the first sensor 4 is for example sensitive to a magnetic field disturbance produced by the second sensor 5.
  • the sensor 4 sends for example an electrical signal to a control member not shown, a microprocessor-based system for example. The sending of this signal therefore corresponds to a given position of the drum 1 in the tank 2.
  • a phase of duration t1 elapses from a given number of coincidences of the two sensors 4, 5 according to a stop order of the drum, preferably from the first coincidence according to the order.
  • the drum travels a first angle ⁇ 1 from its sensed position, corresponding to the coincidence of the two sensors.
  • the speed of the drum being perfectly defined, this first angle ⁇ 1 is well known.
  • the angle ⁇ 1 is defined for example so that the axis 21 passing through the second sensor 5 still has to traverse a given angle ⁇ before coinciding with a fixed reference axis, the axis 22 passing through the first sensor for example.
  • the device according to the invention reduces the speed of the drum by playing on the frequency of the network of feeding the drum drive motor and thereby keeping control of the deceleration.
  • FIG. 4 illustrates a possible operating mode of a device according to the invention by the way in which it modifies the frequency of the power supply network of the drum drive motor in order to influence the speed of rotation of the drum.
  • a first curve 41 illustrates the minimum supply voltage V of the motor as a function of time. This voltage V corresponds to the voltage directly from the network. It has a nominal frequency fo, 50 Hz for example.
  • control means modify the voltage wave according to a second curve 42 so as to obtain, for example, a frequency f0 / 3.
  • a frequency f0 / 3 For this, for example, for three consecutive half-waves of the nominal wave 41, the second half-wave of the first is deleted, the first half-wave of the second is deleted and the third half-wave is purely and simply deleted. The same treatment is applied to the following three alternations and so on.
  • the speed of the drum drops to ⁇ 0 / 3, ⁇ 0 being the nominal speed corresponding to the nominal frequency f0.
  • FIG. 4 shows that the energy applied to the motor, corresponding to the integral of the curve 42, is very low, because of the large number of half-vibrations removed.
  • the wave at frequency f0 / 3 represented by the second curve 21 is three times less energetic. This low energy makes it possible to obtain a rapid decrease of the drum towards the rotation speed ⁇ 0 / 3.
  • the wave control means modify the latter to give it a more energetic appearance and for example always a frequency equal to fo / 3, according to a third curve 43.
  • the first half-wave of the second half-wave is removed and the second half-wave of the third half-wave is removed.
  • the integral of the third representative curve 43 the energy transmitted to the motor is twice as great.
  • FIG. 5 illustrates the speed curve of the drum as a function of the supply voltage waves of its drive motor as illustrated in FIG. 4.
  • the motor rotates at nominal speed ⁇ o, the motor being supplied by a voltage according to the first wave 41.
  • the motor being supplied by a voltage according to the second wave 42, decreases towards the nominal speed divided by 3, ⁇ o / 3. Since wave 42 is not very energetic, this decrease is rapid.
  • the motor being supplied by a voltage according to the third wave 43, it rotates at constant speed ⁇ o / 3, the energy transmitted by the wave being sufficiently energetic to keep it in rotation.
  • the motor is suddenly stopped, by sending it for example a direct current creating a magnetic field preventing its rotation.
  • the speed ⁇ o / 3 of the drum being low, there is no inertial shock with harmful effects.
  • the time t3 is determined so for example that at the end of this time, the second sensor 5 has traversed the angle ⁇ previously defined relative to FIG. 2, this final stopped position corresponding for example to the coincidence of the opening of the drum 1 with that 3 of the tank 2.
  • the angle ⁇ 1 traversed by the drum and illustrated in FIG. 6 can be well defined.
  • the angle ⁇ 2 traveled until the third time t3 is also well defined, thanks to the constant speed ⁇ o / 3 of the drum.
  • the three times t1, t2 and t3 allow the position of the drum to be clearly defined, these times being counted from a given known position of the drum, corresponding for example to the coincidence of the two sensors.
  • the drum At the end of the third time t3, the drum being slowed down, it can be stopped suddenly.
  • the exemplary embodiment presented with regard to FIGS. 4 and 5 corresponds to a case where the way of eliminating the half-vibrations provided by the supply network makes it possible to obtain a voltage wave of frequency fo / 3.
  • FIG. 7 shows a possible embodiment of the means for controlling the voltage wave 41, 42, 43 supplying the motor 71 for driving the drum.
  • These means comprise for example a microprocessor or microcontroller 72, a control output of which is connected to an amplification interface circuit 73, which transmits the microprocessor control signal for example to the trigger of a triac 74 placed in series between a pole of the power supply network 75 and a motor supply terminal 71, the other terminal of the latter being connected to the other pole of the network 75.
  • a synchronization circuit 76 connected to the network 75 supplies the microprocessor 72 with a synchronous signal from the network.
  • the microprocessor 72 controls the opening or closing of the triac as a function of this synchronous signal from the network in order to remove or conserve the half-vibrations of the network according to a program stored in a memory 77, so as for example to reproduce the waveforms illustrated by FIG. 4. If a microcontroller is used, the memory is for example included in it.
  • the microprocessor 72 receives the signal supplied by the means for locating a given position of the drum, a signal for example supplied by the first position sensor 4. At the end of washing or drying, or following an external order arriving on one of its inputs, the microprocessor launches its commands for opening and closing series of triac 74 after the first predetermined time t1, then modifies these series after the second predetermined time t2 so as to obtain the desired waveforms.
  • the times t1, t2 are then counted, for example, from the signal sent by the first sensor 4.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
EP95402345A 1994-10-26 1995-10-20 Stoppositionierungsvorrichtung der Trommel einer Waschmaschine oder eines Trockners Ceased EP0709511A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9412810A FR2726407B1 (fr) 1994-10-26 1994-10-26 Dispositif d'arret positionne du tambour d'un lave-linge ou seche-linge
FR9412810 1994-10-26

Publications (1)

Publication Number Publication Date
EP0709511A1 true EP0709511A1 (de) 1996-05-01

Family

ID=9468233

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95402345A Ceased EP0709511A1 (de) 1994-10-26 1995-10-20 Stoppositionierungsvorrichtung der Trommel einer Waschmaschine oder eines Trockners

Country Status (2)

Country Link
EP (1) EP0709511A1 (de)
FR (1) FR2726407B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1111117A1 (de) * 1999-12-23 2001-06-27 Diehl AKO Stiftung & Co. KG Verfahren zum Positionieren einer Waschtrommel einer Waschmaschine in einer Zielposition

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2364286A1 (fr) * 1976-09-14 1978-04-07 Thomson Brandt Procede et moyens de remise en position desiree d'un tambour a linge dans une machine a laver, et machine a laver comportant de tels moyens
FR2442291A1 (fr) * 1978-11-24 1980-06-20 Esswein Sa Procede d'arret du tambour d'une machine a laver, systeme de mise en oeuvre de ce procede, et machine a laver comportant un tel systeme
FR2522343A1 (fr) * 1982-02-26 1983-09-02 Thomson Brandt Machine lave-linge
EP0337827A1 (de) * 1988-03-11 1989-10-18 Ciapem Verfahren zur Stillstandstellungnahme eines durch einen elektrischen Asynchronmotor angetriebenen, eine Horizontaltrommel aufweisenden Gerätes und dieses Verfahren angewendete Waschmaschine und/oder Trockner

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2364286A1 (fr) * 1976-09-14 1978-04-07 Thomson Brandt Procede et moyens de remise en position desiree d'un tambour a linge dans une machine a laver, et machine a laver comportant de tels moyens
FR2442291A1 (fr) * 1978-11-24 1980-06-20 Esswein Sa Procede d'arret du tambour d'une machine a laver, systeme de mise en oeuvre de ce procede, et machine a laver comportant un tel systeme
FR2522343A1 (fr) * 1982-02-26 1983-09-02 Thomson Brandt Machine lave-linge
EP0337827A1 (de) * 1988-03-11 1989-10-18 Ciapem Verfahren zur Stillstandstellungnahme eines durch einen elektrischen Asynchronmotor angetriebenen, eine Horizontaltrommel aufweisenden Gerätes und dieses Verfahren angewendete Waschmaschine und/oder Trockner

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1111117A1 (de) * 1999-12-23 2001-06-27 Diehl AKO Stiftung & Co. KG Verfahren zum Positionieren einer Waschtrommel einer Waschmaschine in einer Zielposition

Also Published As

Publication number Publication date
FR2726407A1 (fr) 1996-05-03
FR2726407B1 (fr) 1996-11-29

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