EP0106283B1 - Wäschetrockner - Google Patents

Wäschetrockner Download PDF

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Publication number
EP0106283B1
EP0106283B1 EP83110021A EP83110021A EP0106283B1 EP 0106283 B1 EP0106283 B1 EP 0106283B1 EP 83110021 A EP83110021 A EP 83110021A EP 83110021 A EP83110021 A EP 83110021A EP 0106283 B1 EP0106283 B1 EP 0106283B1
Authority
EP
European Patent Office
Prior art keywords
laundry
drum
sensor electrodes
peripheral wall
dryer
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
EP83110021A
Other languages
English (en)
French (fr)
Other versions
EP0106283A3 (en
EP0106283A2 (de
Inventor
Giuseppe Frucco
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 AT83110021T priority Critical patent/ATE32922T1/de
Publication of EP0106283A2 publication Critical patent/EP0106283A2/de
Publication of EP0106283A3 publication Critical patent/EP0106283A3/en
Application granted granted Critical
Publication of EP0106283B1 publication Critical patent/EP0106283B1/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
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/14—Arrangements for detecting or measuring specific parameters
    • D06F34/18—Condition of the laundry, e.g. nature or weight
    • 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
    • D06F2103/02—Characteristics of laundry or load
    • D06F2103/08—Humidity
    • D06F2103/10—Humidity expressed as capacitance or resistance
    • 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
    • D06F2105/28—Electric heating
    • 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
    • D06F2105/30—Blowers
    • 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
    • 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
    • D06F58/00—Domestic laundry dryers
    • D06F58/02—Domestic laundry dryers having dryer drums rotating about a horizontal axis
    • D06F58/04—Details 
    • 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
    • D06F58/00—Domestic laundry dryers
    • D06F58/32—Control of operations performed in domestic laundry dryers 
    • D06F58/34—Control of operations performed in domestic laundry dryers  characterised by the purpose or target of the control
    • D06F58/36—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry
    • D06F58/38—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry of drying, e.g. to achieve the target humidity

Definitions

  • the present invention relates to a laundry dryer comprising a rotating drum provided with sensor electrodes for measuring the degree of moisture of the laundry contained in said drum.
  • the sensor electrodes which may be designed to any shape and dimensions, are disposed in said drum in such a manner that they are in contact with the laundry during the entire drying operation for producing electric output signals indicative of the varying degree of moisture of the laundry during operation of the dryer.
  • Laundry dryers of this type such as described in US-A-3335501 are additionally provided with a moisture control device comprising for instance an electronic comparator circuit of conventional type connected to said sensor electrodes and to the electric circuitry of the dryer.
  • This control device is programmed for comparing the electric signals produced by said sensor electrodes to predetermined electric reference signals corresponding to the condition in which the laundry is dried to a satisfactory degree.
  • control device causes said heater element and said motors to be deenergized so as to terminate the laundry drying operation.
  • said control device is able to interrupt the laundry drying operation at any instant of the operation cycle in the case for instance of failure of components of the dryer which might otherwise lead to the laundry becoming overheated and damaged thereby.
  • the sensor electrodes of laundry dryers of the type described have to be dimensioned and to be located in the drum of such dryer in such a manner that the contact area of the sensor electrodes with the laundry is as large as possible and that contact between the electrodes and the laundry is ensured under all operational conditions.
  • present laundry dryers are provided with two groups of sensor electrodes disposed at various locations on the interior wall surface of the drum so as to come into contact with the laundry.
  • the sensor electrodes may for instance be located adjacent the end walls of the drum or may take the form of circumferential rings affixed to the drum.
  • the groups of electrodes are electrically insulated from one another and connected respectively to the electric supply source and to the mass of the dryer in a per se known manner.
  • the resulting contact areas between the sensor electrodes and the laundry are of a correspondingly limited size.
  • the invention is substantially based on the employ of the wall surface of the drum itself for forming the sensor electrodes, whereby to obtain maximum contact areas between said electrodes and the laundry during the drying operation.
  • a laundry dryer comprising a rotating drum adapted to contain the wet laundry to be dried and having a peripheral wall and two end walls, a stream of heated drying air being passed through said drum with the aid of at least one heater element, and further comprising at least two sensor electrodes connected respectively to an electric supply source and to the mass of the dryer through per se known means for measuring the degree of moisture of said laundry and controlling the energization and deenergization of said heater element with the aid of a per se known control device connected to said sensor electrodes.
  • a laundry dryer of this type is characterized in that said sensor electrodes are formed respectively by a portion of the peripheral wall surface and one of said end walls, said peripheral wall surface portions being located adjacent one another and connected to one another with interposition of at least one electrically insulating element.
  • a laundry dryer according to the invention comprises an outer housing 3 enclosing a rotatable drum 4 adapted to contain the wet laundry and driven to rotate by a per se known motor (not shown).
  • Drum 4 comprises a peripheral wall 5 and two end walls 6, 7, a forward and a rearward one, respectively, and is mounted, cantilever fashion, within housing 3 by means of an axle pin 8 attached to rear end wall 7.
  • Rear end wall 7 of drum 4 is formed with a through-opening 9 communicating with an air inlet opening 31 formed in the rear wall of housing 3.
  • a duct 10 communicates on the one hand with an access opening 11 formed in front end wall 6 of drum 4, and on the other hand, with an air outlet opening 32 formed at the rear of the dryer.
  • Located in duct 10 are a lint filter 12, a blower 13 driven by a motor 14, and at least one heater element 15 of conventional type. Drying air aspirated from the exterior by blower 13 through inlet opening 31 is heated by heater element 15 before passing through the wet laundry contained in drum 4 for progressively drying the laundry. The air is subsequently exhausted to the exterior of the dryer through outlet opening 32.
  • the present laundry dryer is further provided with at least two individual sensor electrodes in contact with the laundry for measuring the conductivity of the laundry to thereby determine the degree of moisture thereof during all phases of the drying operation.
  • the drum of the dryer is formed of two separate components 16 and 17 directly functioning as the said sensor electrodes, each of said components being formed by a peripheral wall surface portion 18 and 19, and one of said end walls 6 and 7, respectively, with at least one element 20 formed of an electrically insulating material being interposed between the two thus formed components.
  • element 20 is preferably formed as a ring having the same diameter as the peripheral wall 5 of drum 4, although of limited width.
  • ring 20 is formed with lateral slots or incisions 21 and 22 adapted to receive therein the respective edges 23 and 24 of the two peripheral wall portions 18 and 19 of drum 4.
  • Assembly of the drum is carried out by mutually approaching the two components 16 and 17, with interposition of annular element 20, and by fully introducing the respective edges 23 and 24 into lateral incisions 21 and 22 of element 20.
  • the assembly of the two components 16 and 17 with annular element 20 may of course also be carried out in a different manner within the scope of the present invention.
  • the component 16 on its part has applied a voltage thereto by the sliding contact of a brush 28 connected to an electric supply source of the dryer with a raised edge portion 29 of front end wall 6.
  • Brush 28 is in addition connected to a terminal of a conventional electronic control device 30 inserted into the electric circuitry of the dryer, the other terminal of said moisture control device 30 being connected to ground.
  • control device 30 the latter being effective to continuously monitor these values and to permit the drying operation to continue until the laundry has been dried to a suitable state.
  • control device 30 automatically and in a per se known manner causes heater element 15 and the motors driving drum 4 and blower 13 to be deenergized so as to terminate the drying operation.
  • control device may likewise be designed for interrupting the drying operation during any phase of the operating cycle in the case of failure of any components of the dryer which might otherwise result in overheating of and the danger of damage to the laundry.
  • the drum is of particularly simple construction, with a noteworthy saving of the required material.
  • the described construction provides the greatest possible contact area between the sensor electrodes and the laundry, whereby it is possible to achieve continuous and accurate measurements of the degree of moisture of the laundry during the drying operation, so that the laundry can be dried to an optimum state.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Drying Of Solid Materials (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Claims (2)

1. Wäschetrockner mit einer rotierenden Trommel (4), die zur Aufnahme von feuchter, zu trocknender Wäsche bestimmt ist und eine Umfangswand (5) und zwei Stirnwände (6, 7) aufweist, wobei ein Strom erwärmter Trocknungsluft durch die Trommel mit Unterstützung durch wenigstens ein Heizelement (15) geleitet wird, und weiterhin enthaltend wenigstens zwei Sensorelektroden, die jeweils mit einer elektrischen Stromquelle und mit dem geerdeten Masseanschluß des Trockners über an sich bekannte Einrichtungen zum Messen des Feuchtigkeitsgehaltes der Wäsche verbunden sind und die Stromversorgung und Abschaltung des Heizelementes mit Hilfe einer an sich bekannten Steuereinrichtung steuern, die mit den Sensorelektroden verbunden ist, dadurch gekennzeichnet, daß die Sensorelektroden jeweils aus einem Abschnitt der Umfangswandfläche (18, 19) und einer der Stirnwände (6, 7) gebildet sind, wobei die Umfangswandflächenabschnitte (18, 19) einander benachbart angeordnet und miteinander über wenigstens ein elektrisch isolierendes Element (20) verbunden sind.
2. Wäschetrockner nach Anspruch 1, dadurch gekennzeichnet, daß das isolierende Element als .ein Ring (20) ausgebildet ist, der den gleichen Durchmesser wie die Umfangswandflächenabschnitte (18, 19) aufweist und von begrenzter Breite ist, daß der Ring längs seines gesamten Umfangs mit Quereinschnitten (21, 22) versehen ist, die dazu eingerichtet sind, die jeweiligen Ränder (23, 24) der genannten Umfangswandabschnitte aufzunehmen.
EP83110021A 1982-10-08 1983-10-06 Wäschetrockner Expired EP0106283B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83110021T ATE32922T1 (de) 1982-10-08 1983-10-06 Waeschetrockner.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT45733/82A IT1159766B (it) 1982-10-08 1982-10-08 Macchina asciugabiancheria di tipo perfezionato
IT4573382 1982-10-08

Publications (3)

Publication Number Publication Date
EP0106283A2 EP0106283A2 (de) 1984-04-25
EP0106283A3 EP0106283A3 (en) 1986-03-19
EP0106283B1 true EP0106283B1 (de) 1988-03-09

Family

ID=11257875

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83110021A Expired EP0106283B1 (de) 1982-10-08 1983-10-06 Wäschetrockner

Country Status (4)

Country Link
EP (1) EP0106283B1 (de)
AT (1) ATE32922T1 (de)
DE (1) DE3375934D1 (de)
IT (1) IT1159766B (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3345303A1 (de) * 1983-12-14 1985-06-27 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Haushalt-waeschetrockner
IT1217752B (it) * 1988-06-01 1990-03-30 Merloni A Spa Macchina asciugatrice pet biancheria
IT218178Z2 (it) * 1988-07-22 1992-04-08 Zanussi A Spa Industrie Macchina asciugabiancheria.
ITPN20030004U1 (it) * 2003-02-19 2004-08-20 Electrolux Home Products Corporatio N N V Asciugabiancheria domestica silenziosa
TR200804416T1 (tr) * 2006-01-05 2008-11-21 Ar�El�K Anon�M ��Rket� Bir yıkayıcı/kurutucu

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3335501A (en) * 1964-06-24 1967-08-15 Whirlpool Co Electronic dry control with storage capacitors for dryers
DE1785476A1 (de) * 1968-09-27 1972-02-03 Siemens Elektrogeraete Gmbh Waeschetrockner mit einer die Waesche aufnehmenden,von einer Stirnseite beschickbaren Trommel

Also Published As

Publication number Publication date
IT8245733A0 (it) 1982-10-08
ATE32922T1 (de) 1988-03-15
EP0106283A3 (en) 1986-03-19
IT1159766B (it) 1987-03-04
DE3375934D1 (en) 1988-04-14
EP0106283A2 (de) 1984-04-25

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