EP3561173B1 - Scanner for a device for measuring moisture content of laundry, device and laundry dryer - Google Patents

Scanner for a device for measuring moisture content of laundry, device and laundry dryer Download PDF

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Publication number
EP3561173B1
EP3561173B1 EP19169708.5A EP19169708A EP3561173B1 EP 3561173 B1 EP3561173 B1 EP 3561173B1 EP 19169708 A EP19169708 A EP 19169708A EP 3561173 B1 EP3561173 B1 EP 3561173B1
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EP
European Patent Office
Prior art keywords
scanner
sliding contact
drying drum
laundry
moisture content
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EP19169708.5A
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German (de)
French (fr)
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EP3561173A1 (en
Inventor
Alexander Pimenov
Ole Hansen
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Miele und Cie KG
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Miele und Cie KG
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Publication of EP3561173A1 publication Critical patent/EP3561173A1/en
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    • 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
    • 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
    • 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 invention relates to a scanner for a device for detecting a moisture content of a laundry located in a tumble dryer with a rotatable drying drum of the type mentioned in the preamble of claim 1, a device for detecting a moisture content of a laundry located in a tumble dryer with a rotatable drying drum of claim 5 and a clothes dryer with a rotatable drying drum of the type mentioned in the preamble of claim 6.
  • tumble dryers, devices and scanners are already known in a variety of embodiments from the prior art.
  • a device for detecting a moisture content in a laundry for a tumble dryer with a rotatably mounted drying drum the drum shell of which has two parallel, spaced-apart contact strips, a fixed scanning arm having a movably mounted holder for two sliding contacts mounted under spring tension.
  • the known sliding contacts are designed as carbon contacts. See, for example, the EP 2 028 314 B1 .
  • a clothes dryer with a device for detecting a moisture content in the laundry is known, in which the contact strip is formed from an electrically conductive plastic.
  • the invention therefore presents the problem of specifying a scanner, a device for detecting a moisture content of a laundry and a clothes dryer with such a device, in which a proper function of the detection of the moisture content of the laundry is ensured over a long period of time.
  • this problem is solved by a scanner for a device for detecting a moisture content of a laundry located in a tumble dryer with a rotatable drying drum with the features of claim 1, according to which the sliding contact is formed from an electrically conductive plastic. Furthermore, the problem according to the invention is solved by a device for detecting a moisture content of a laundry located in a tumble dryer with a rotatable drying drum with the features of patent claim 5 and a tumble dryer with a rotatable one Drying drum with the features of claim 6 solved.
  • the advantage that can be achieved with the invention is, in particular, that a proper function of the detection of the moisture content of the laundry is ensured over a long period of time.
  • the service life of the scanner according to the invention, the device according to the invention for detecting the moisture content of the laundry and the laundry dryer according to the invention equipped with such a device is correspondingly extended. This reduces the number of customer service assignments in this regard.
  • the scanner according to the invention, the device according to the invention and the tumble dryer according to the invention do not have to be serviced or repaired over their entire running time, that is to say over their total period of use, in the components relevant to the invention.
  • the scanners Due to the larger drum diameters, the scanners are subject to higher peripheral speeds and, compared to household appliances, cover a longer running distance over their service life.
  • the more diverse number of textile types to be dried in the professional area also contributes to the intensive wear of the scanner carbon. Accordingly, a solution to the wear problem with the sliding contacts in professional devices is even more important than in household appliances.
  • the sliding contact is designed as an electrically conductive plastic. Electrically conductive plastics are available in a large number of embodiments and material properties and can therefore be used advantageously for a large number of different applications.
  • the scanner according to the type, material, dimensions, shape, arrangement and number can be freely selected within wide suitable limits. The same applies to the at least one sliding contact of the scanner.
  • the sliding contact has a sliding friction coefficient, dynamic against steel, of less than or equal to 0.6, preferably less than or equal to 0.4, particularly preferably less than or equal to 0.2. In this way, the friction between the sliding contact on one side and the drying drum or the contact belt arranged on the drying drum on the other side. The wear of the at least one sliding contact is correspondingly significantly reduced.
  • a further advantageous development of the scanner according to the invention provides that the sliding contact has an electrical resistance of less than or equal to 100 ohms, preferably less than or equal to 1 ohms, particularly preferably less than or equal to 0.01 ohms. This improves the detection of the moisture content of the laundry in the drying drum. Deviations due to the electrical resistance of the sliding contact are thus significantly reduced. The detection of the moisture content is thus simplified since compensation for such deviations is not necessary or is possible with simple means.
  • a particularly advantageous development of the scanner according to the invention provides that the sliding contact is designed to be suitable for long-term use at a temperature of greater than or equal to 140 ° C. and for short-term use at a temperature of greater than or equal to 180 ° C. In this way, applications in the professional field are possible over a long period of time without maintenance or repair of the scanner.
  • FIG. 1 An embodiment of a clothes dryer 2 according to the invention is partially shown in a partial sectional view.
  • the clothes dryer 2 is designed as a clothes dryer for the household, that is for non-professional use.
  • the clothes dryer 2 has a drying drum 4, in which drum ribs 6 are arranged. At least one of the drum ribs 6 is electrically conductively connected to a first contact strip 8 in a manner known to those skilled in the art.
  • the first contact strip 8 is arranged on an outer surface of a drum shell of the drying drum 4 and in an electrically insulated manner from the drum shell of the drying drum 4.
  • a second contact band 10 is electrically conductively connected to the outer surface of the drum jacket of the drying drum 4 and is arranged parallel to the first contact band 8.
  • a scanner 14 designed as a scanning arm is fastened to a housing 12 of the clothes dryer 2.
  • the scanner 14 has a holder 16 on which a first sliding contact 18 and a second sliding contact 20 are each resiliently mounted.
  • the first and the second sliding contact 18, 20 are clamped on one side in the holder 16 with one end of the respective sliding contact 18, 20 in a manner known to the person skilled in the art.
  • the scanner 14 with the holder 16 and the sliding contacts 18, 20 resiliently mounted thereon is arranged relative to the contact strips 8, 10 such that the first sliding contact 18 with its free end against the first contact strip 8 and the second sliding contact 20 with its free end is pressed against the second contact strip 10.
  • the two sliding contacts 18, 20 thus abut against the corresponding contact belt 8, 10 when the drying drum 4 is rotatably mounted about an axis of rotation 22 on the housing 12 of the clothes dryer 2.
  • the first and the second sliding contact 18, 20 are each electrically conductively connected to a control of the clothes dryer 2, not shown, in a manner known to those skilled in the art.
  • first sliding contact 18, which bears against the first contact strip 8, which is electrically conductively connected to one of the ribs 6, and the second sliding contact 20, which bears against the second contact strip 10, which is electrically conductively connected to the outer surface of the drum shell of the drying drum 4 it is now possible to detect the moisture content of a laundry 24 located in the drying drum 4 in a manner known to the person skilled in the art and to use it in the control of the clothes dryer 2 to control or regulate the clothes dryer 2.
  • the first and the second sliding contact 18, 20 are made of the same material from an electrically conductive plastic.
  • the electrically conductive plastic has a sliding friction coefficient ⁇ , dynamic against steel, of approximately 0.1 to approximately 0.39. Furthermore, the electrical resistance in the electrically conductive plastic is less than 100 ohms.
  • the electrically conductive plastic is also suitable for long-term use at a temperature of approximately 140 ° C. and for short-term use at a temperature of approximately 180 ° C.
  • the scanner 14 and the device for detecting the moisture content are designed such that maintenance or repair of the Scanner 14 over the total service life of the clothes dryer 2, that is to say over its entire service life, is not required. Customer service calls in this regard are therefore unnecessary.
  • the invention is not restricted to the present exemplary embodiment.
  • the invention can be used advantageously in particular in the professional field, that is to say in tumble dryers for professional use.
  • the other sliding contact can then abut, for example, directly on the outer surface of the drum shell of the drying drum.
  • This training is common in the professional field.
  • one of the contacts of the device for detecting the moisture content of the laundry does not abut the drum jacket, but rather on a drum base of the drying drum.
  • one of the contacts is not designed as a sliding contact. For example, it is conceivable to arrange such a contact on a drum cap of the drying drum.

Description

Die Erfindung betrifft einen Abtaster für eine Einrichtung zur Erfassung eines Feuchtegehalts einer in einem Wäschetrockner mit einer drehbaren Trockentrommel befindlichen Wäsche der im Oberbegriff des Anspruchs 1 genannten Art, eine Einrichtung zur Erfassung eines Feuchtegehalts einer in einem Wäschetrockner mit einer drehbaren Trockentrommel befindlichen Wäsche der im Oberbegriff des Anspruchs 5 genannten Art und einen Wäschetrockner mit einer drehbaren Trockentrommel der im Oberbegriff des Anspruchs 6 genannten Art.The invention relates to a scanner for a device for detecting a moisture content of a laundry located in a tumble dryer with a rotatable drying drum of the type mentioned in the preamble of claim 1, a device for detecting a moisture content of a laundry located in a tumble dryer with a rotatable drying drum of claim 5 and a clothes dryer with a rotatable drying drum of the type mentioned in the preamble of claim 6.

Derartige Wäschetrockner, Einrichtungen und Abtaster sind aus dem Stand der Technik bereits in vielfältigen Ausführungsformen bekannt.Such tumble dryers, devices and scanners are already known in a variety of embodiments from the prior art.

Beispielsweise ist aus der DE 44 37 635 C2 eine Einrichtung zur Erfassung eines Feuchtegehalts in einer Wäsche für einen Wäschetrockner mit einer drehbar gelagerten Trockentrommel bekannt, deren Trommelmantel zwei parallel mit Abstand zueinander angeordnete Kontaktbänder aufweist, wobei ein feststehender Abtastarm einen bewegbar gelagerten Halter für zwei unter Federspannung gelagerte Schleifkontakte aufweist. Die bekannten Schleifkontakte sind als Kohlekontakte ausgebildet. Siehe hierzu beispielsweise auch die EP 2 028 314 B1 . Aus der EP 2 377 989 A1 ist ein Wäschetrockner mit einer Einrichtung zur Erfassung eines Feuchtegehalts in der Wäsche bekannt, bei dem das Kontaktband aus einem elektrisch leitfähigem Kunststoff ausgebildet ist.For example, from the DE 44 37 635 C2 a device for detecting a moisture content in a laundry for a tumble dryer with a rotatably mounted drying drum, the drum shell of which has two parallel, spaced-apart contact strips, a fixed scanning arm having a movably mounted holder for two sliding contacts mounted under spring tension. The known sliding contacts are designed as carbon contacts. See, for example, the EP 2 028 314 B1 . From the EP 2 377 989 A1 a clothes dryer with a device for detecting a moisture content in the laundry is known, in which the contact strip is formed from an electrically conductive plastic.

Der Erfindung stellt sich somit das Problem einen Abtaster, eine Einrichtung zur Erfassung eines Feuchtegehalts einer Wäsche und einen Wäschetrockner mit einer derartigen Einrichtung anzugeben, bei denen eine ordnungsgemäße Funktion der Erfassung des Feuchtegehalts der Wäsche über einen langen Zeitraum gewährleistet ist.The invention therefore presents the problem of specifying a scanner, a device for detecting a moisture content of a laundry and a clothes dryer with such a device, in which a proper function of the detection of the moisture content of the laundry is ensured over a long period of time.

Erfindungsgemäß wird dieses Problem durch einen Abtaster für eine Einrichtung zur Erfassung eines Feuchtegehalts einer in einem Wäschetrockner mit einer drehbaren Trockentrommel befindlichen Wäsche mit den Merkmalen des Patentanspruchs 1 gelöst, wonach der Schleifkontakt aus einem elektrisch leitfähigen Kunststoff ausgebildet ist. Ferner wird das erfindungsgemäße Problem durch eine Einrichtung zur Erfassung eines Feuchtegehalts einer in einem Wäschetrockner mit einer drehbaren Trockentrommel befindlichen Wäsche mit den Merkmalen des Patentanspruchs 5 und einen Wäschetrockner mit einer drehbaren Trockentrommel mit den Merkmalen des Patentanspruchs 6 gelöst. Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung ergeben sich aus den nachfolgenden Unteransprüchen.According to the invention, this problem is solved by a scanner for a device for detecting a moisture content of a laundry located in a tumble dryer with a rotatable drying drum with the features of claim 1, according to which the sliding contact is formed from an electrically conductive plastic. Furthermore, the problem according to the invention is solved by a device for detecting a moisture content of a laundry located in a tumble dryer with a rotatable drying drum with the features of patent claim 5 and a tumble dryer with a rotatable one Drying drum with the features of claim 6 solved. Advantageous refinements and developments of the invention result from the following subclaims.

Der mit der Erfindung erreichbare Vorteil besteht insbesondere darin, dass eine ordnungsgemäße Funktion der Erfassung des Feuchtegehalts der Wäsche über einen langen Zeitraum gewährleistet ist. Entsprechend verlängert sich die Standzeit des erfindungsgemäßen Abtasters, der erfindungsgemäßen Einrichtung zur Erfassung des Feuchtegehalts der Wäsche und des mit einer derartigen Einrichtung ausgestatteten erfindungsgemäßen Wäschetrockners. Somit reduziert sich die Anzahl der diesbezüglichen Kundendiensteinsätze. Beispielsweise ist es denkbar, dass der erfindungsgemäße Abtaster, die erfindungsgemäße Einrichtung und der erfindungsgemäße Wäschetrockner über deren gesamte Laufzeit, also über deren Gesamtgebrauchszeitraum, in den für die Erfindung relevanten Bauteilen nicht gewartet oder repariert werden müssen.The advantage that can be achieved with the invention is, in particular, that a proper function of the detection of the moisture content of the laundry is ensured over a long period of time. The service life of the scanner according to the invention, the device according to the invention for detecting the moisture content of the laundry and the laundry dryer according to the invention equipped with such a device is correspondingly extended. This reduces the number of customer service assignments in this regard. For example, it is conceivable that the scanner according to the invention, the device according to the invention and the tumble dryer according to the invention do not have to be serviced or repaired over their entire running time, that is to say over their total period of use, in the components relevant to the invention.

Die erfindungsgemäßen Vorteile gelten gleichermaßen für Haushaltsgeräte wie auch für professionelle Wäschetrockner. Insbesondere wirkt sich die Erfindung jedoch bei Wäschetrocknern für den professionellen Bereich vorteilhaft aus, da diese Wäschetrockner besonders stark beansprucht werden.The advantages according to the invention apply equally to household appliances and to professional tumble dryers. In particular, however, the invention has an advantageous effect on tumble dryers for the professional sector, since these tumble dryers are particularly stressed.

Durch die größeren Trommeldurchmessern unterliegen die Abtaster höheren Umfangsgeschwindigkeiten und legen im Vergleich zu Haushaltsgeräten eine längere Laufstrecke über die Lebensdauer ab. Die vielfältigere Anzahl der zu trocknenden Textilarten im Professional-Bereich trägt zum intensiven Verschleiß der Abtasterkohle darüber hinaus bei. Entsprechend ist eine Lösung der Verschleißproblematik bei den Schleifkontakten bei professionellen Geräten noch wichtiger als bei den Haushaltsgeräten.Due to the larger drum diameters, the scanners are subject to higher peripheral speeds and, compared to household appliances, cover a longer running distance over their service life. The more diverse number of textile types to be dried in the professional area also contributes to the intensive wear of the scanner carbon. Accordingly, a solution to the wear problem with the sliding contacts in professional devices is even more important than in household appliances.

Der Schleifkontakt ist als ein elektrisch leitfähiger Kunststoff ausgebildet. Elektrisch leitfähige Kunststoffe sind in einer Vielzahl von Ausführungsformen und Materialeigenschaften verfügbar und somit für eine Vielzahl von voneinander verschiedenen Anwendungsfällen vorteilhaft einsetzbar.The sliding contact is designed as an electrically conductive plastic. Electrically conductive plastics are available in a large number of embodiments and material properties and can therefore be used advantageously for a large number of different applications.

Grundsätzlich ist der erfindungsgemäße Abtaster nach Art, Material, Dimensionierung, Form, Anordnung und Anzahl in weiten geeigneten Grenzen frei wählbar. Gleiches gilt für den mindestens einen Schleifkontakt des Abtasters.Basically, the scanner according to the type, material, dimensions, shape, arrangement and number can be freely selected within wide suitable limits. The same applies to the at least one sliding contact of the scanner.

Eine vorteilhafte Weiterbildung des erfindungsgemäßen Abtasters sieht vor, dass der Schleifkontakt einen Gleitreibwert, dynamisch gegen Stahl, von kleiner oder gleich 0,6, bevorzugt von kleiner oder gleich 0,4, besonders bevorzugt von kleiner oder gleich 0,2, aufweist. Auf diese Weise ist die Reibung zwischen dem Schleifkontakt auf der einen Seite und der Trockentrommel oder dem an der Trockentrommel angeordneten Kontaktband auf der anderen Seite reduziert. Entsprechend ist auch der Verschleiß des mindestens einen Schleifkontakts wesentlich vermindert.An advantageous development of the scanner according to the invention provides that the sliding contact has a sliding friction coefficient, dynamic against steel, of less than or equal to 0.6, preferably less than or equal to 0.4, particularly preferably less than or equal to 0.2. In this way, the friction between the sliding contact on one side and the drying drum or the contact belt arranged on the drying drum on the other side. The wear of the at least one sliding contact is correspondingly significantly reduced.

Eine weitere vorteilhafte Weiterbildung des erfindungsgemäßen Abtasters sieht vor, dass der Schleifkontakt einen elektrischen Widerstand von kleiner oder gleich 100 Ohm, bevorzugt von kleiner oder gleich 1 Ohm, besonders bevorzugt von kleiner oder gleich 0,01 Ohm, aufweist. Hierdurch ist die Erfassung des Feuchtegehalts der in der Trockentrommel befindlichen Wäsche verbessert. Abweichungen aufgrund des elektrischen Widerstands des Schleifkontakts sind somit wesentlich reduziert. Die Erfassung des Feuchtegehalts ist somit vereinfacht, da eine Kompensation derartiger Abweichungen nicht erforderlich oder mit einfachen Mitteln möglich ist.A further advantageous development of the scanner according to the invention provides that the sliding contact has an electrical resistance of less than or equal to 100 ohms, preferably less than or equal to 1 ohms, particularly preferably less than or equal to 0.01 ohms. This improves the detection of the moisture content of the laundry in the drying drum. Deviations due to the electrical resistance of the sliding contact are thus significantly reduced. The detection of the moisture content is thus simplified since compensation for such deviations is not necessary or is possible with simple means.

Eine besonders vorteilhafte Weiterbildung des erfindungsgemäßen Abtasters sieht vor, dass der Schleifkontakt für eine Langzeitanwendung bei einer Temperatur von größer oder gleich 140°C und für eine Kurzzeitanwendung bei einer Temperatur von größer oder gleich 180°C geeignet ausgebildet ist. Auf diese Weise sind insbesondere Anwendungen im professionellen Bereich über einen langen Zeitraum ohne Wartung oder Reparatur des Abtasters ermöglicht.A particularly advantageous development of the scanner according to the invention provides that the sliding contact is designed to be suitable for long-term use at a temperature of greater than or equal to 140 ° C. and for short-term use at a temperature of greater than or equal to 180 ° C. In this way, applications in the professional field are possible over a long period of time without maintenance or repair of the scanner.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung rein schematisch dargestellt und wird nachfolgend näher beschrieben. Es zeigt die einzige

Figur 1
ein Ausführungsbeispiel eines erfindungsgemäßen Wäschetrockners, mit einer erfindungsgemäßen Einrichtung zur Erfassung eines Feuchtegehalts einer Wäsche und einem erfindungsgemäßen Abtaster, in einer teilweise geschnittenen Seitenansicht, in teilweiser Darstellung.
An embodiment of the invention is shown purely schematically in the drawing and is described in more detail below. It shows the only one
Figure 1
an embodiment of a clothes dryer according to the invention, with a device according to the invention for detecting a moisture content of a laundry and a scanner according to the invention, in a partially sectioned side view, in a partial representation.

In Fig. 1 ist ein Ausführungsbeispiel eines erfindungsgemäßen Wäschetrockners 2 in einer teilweisen Schnittansicht teilweise dargestellt. Der Wäschetrockner 2 ist als ein Wäschetrockner für den Haushalt, also für den nicht professionellen Einsatz, ausgebildet. Der Wäschetrockner 2 weist eine Trockentrommel 4 auf, in der Trommelrippen 6 angeordnet sind. Mindestens eine der Trommelrippen 6 ist mit einem ersten Kontaktband 8 auf dem Fachmann bekannte Weise elektrisch leitend verbunden. Das erste Kontaktband 8 ist an einer Außenfläche eines Trommelmantels der Trockentrommel 4 und gegenüber dem Trommelmantel der Trockentrommel 4 elektrisch isoliert angeordnet. Ein zweites Kontaktband 10 ist elektrisch leitend mit der Außenfläche des Trommelmantels der Trockentrommel 4 verbunden und parallel zu dem ersten Kontaktband 8 angeordnet.In Fig. 1 An embodiment of a clothes dryer 2 according to the invention is partially shown in a partial sectional view. The clothes dryer 2 is designed as a clothes dryer for the household, that is for non-professional use. The clothes dryer 2 has a drying drum 4, in which drum ribs 6 are arranged. At least one of the drum ribs 6 is electrically conductively connected to a first contact strip 8 in a manner known to those skilled in the art. The first contact strip 8 is arranged on an outer surface of a drum shell of the drying drum 4 and in an electrically insulated manner from the drum shell of the drying drum 4. A second contact band 10 is electrically conductively connected to the outer surface of the drum jacket of the drying drum 4 and is arranged parallel to the first contact band 8.

An einem Gehäuse 12 des Wäschetrockners 2 ist ein als Abtastarm ausgebildeter Abtaster 14 befestigt. Der Abtaster 14 weist einen Halter 16 auf, an dem ein erster Schleifkontakt 18 und ein zweiter Schleifkontakt 20 jeweils federnd gelagert sind. Hierfür sind der erste und der zweite Schleifkontakt 18, 20 mit einem Ende des jeweiligen Schleifkontakts 18, 20 auf dem Fachmann bekannte Weise in den Halter 16 einseitig eingespannt. Der Abtaster 14 mit dem Halter 16 und den daran federnd gelagerten Schleifkontakten 18, 20 ist relativ zu den Kontaktbändern 8, 10 derart angeordnet, dass der erste Schleifkontakt 18 mit dessen freien Ende gegen das erste Kontaktband 8 und der zweite Schleifkontakt 20 mit dessen freien Ende gegen das zweite Kontaktband 10 gedrückt wird. Die beiden Schleifkontakte 18, 20 liegen somit bei einer Drehung der um eine Drehachse 22 drehbar an dem Gehäuse 12 des Wäschetrockners 2 gelagerten Trockentrommel 4 schleifend an dem jeweils korrespondierenden Kontaktband 8, 10 an.A scanner 14 designed as a scanning arm is fastened to a housing 12 of the clothes dryer 2. The scanner 14 has a holder 16 on which a first sliding contact 18 and a second sliding contact 20 are each resiliently mounted. For this purpose, the first and the second sliding contact 18, 20 are clamped on one side in the holder 16 with one end of the respective sliding contact 18, 20 in a manner known to the person skilled in the art. The scanner 14 with the holder 16 and the sliding contacts 18, 20 resiliently mounted thereon is arranged relative to the contact strips 8, 10 such that the first sliding contact 18 with its free end against the first contact strip 8 and the second sliding contact 20 with its free end is pressed against the second contact strip 10. The two sliding contacts 18, 20 thus abut against the corresponding contact belt 8, 10 when the drying drum 4 is rotatably mounted about an axis of rotation 22 on the housing 12 of the clothes dryer 2.

Der erste und der zweite Schleifkontakt 18, 20 sind jeweils auf dem Fachmann bekannte Weise elektrisch leitend mit einer nicht dargestellten Steuerung des Wäschetrockners 2 verbunden. Mittels des ersten Schleifkontakts 18, der schleifend an dem mit einer der Rippen 6 elektrisch leitend verbundenen ersten Kontaktband 8 anliegt, und dem zweiten Schleifkontakt 20, der schleifend an dem mit der Außenfläche des Trommelmantels der Trockentrommel 4 elektrisch leitend verbundenen zweiten Kontaktband 10 anliegt, ist es nun möglich, den Feuchtegehalt einer in der Trockentrommel 4 befindlichen Wäsche 24 auf dem Fachmann bekannte Weise zu erfassen und in der Steuerung des Wäschetrockners 2 zur Steuerung oder Regelung des Wäschetrockners 2 zu verwerten.The first and the second sliding contact 18, 20 are each electrically conductively connected to a control of the clothes dryer 2, not shown, in a manner known to those skilled in the art. By means of the first sliding contact 18, which bears against the first contact strip 8, which is electrically conductively connected to one of the ribs 6, and the second sliding contact 20, which bears against the second contact strip 10, which is electrically conductively connected to the outer surface of the drum shell of the drying drum 4 it is now possible to detect the moisture content of a laundry 24 located in the drying drum 4 in a manner known to the person skilled in the art and to use it in the control of the clothes dryer 2 to control or regulate the clothes dryer 2.

Der erste und der zweite Schleifkontakt 18, 20 sind materialgleich aus einem elektrisch leitfähigen Kunststoff ausgebildet. Der elektrisch leitfähige Kunststoff weist einen Gleitreibwert µ, dynamisch gegen Stahl, von etwa 0,1 bis etwa 0,39 auf. Ferner beträgt der elektrische Widerstand bei dem elektrisch leitfähigen Kunststoff weniger als 100 Ohm. Der elektrisch leitfähige Kunststoff ist darüber hinaus für eine Langzeitanwendung bei einer Temperatur von etwa 140°C und für eine Kurzzeitanwendung bei einer Temperatur von etwa 180°C geeignet ausgebildet.The first and the second sliding contact 18, 20 are made of the same material from an electrically conductive plastic. The electrically conductive plastic has a sliding friction coefficient μ, dynamic against steel, of approximately 0.1 to approximately 0.39. Furthermore, the electrical resistance in the electrically conductive plastic is less than 100 ohms. The electrically conductive plastic is also suitable for long-term use at a temperature of approximately 140 ° C. and for short-term use at a temperature of approximately 180 ° C.

Mittels der Erfindung gemäß dem vorliegenden Ausführungsbeispiel ist es möglich, den Feuchtegehalt der Wäsche 24, beispielsweise zur Bestimmung der Restfeuchte der Wäsche 24, über eine sehr lange Standzeit des Abtasters 14 und damit über eine sehr lange Standzeit der Einrichtung zur Erfassung des Feuchtegehalts der Wäsche 24 und des Wäschetrockners 2 ordnungsgemäß zu erfassen und für die Steuerung oder Regelung des Wäschetrockners 2 zu verwenden. Bei dem vorliegenden Ausführungsbeispiel ist der Abtaster 14 und die Einrichtung zur Erfassung des Feuchtegehalts derart ausgebildet, dass eine Wartung oder Reparatur des Abtasters 14 über die Gesamtgebrauchsdauer des Wäschetrockners 2, also über dessen gesamte Lebenszeit, nicht erforderlich ist. Diesbezügliche Kundendiensteinsätze sind somit entbehrlich.By means of the invention according to the present exemplary embodiment, it is possible to determine the moisture content of the laundry 24, for example to determine the residual moisture of the laundry 24, over a very long service life of the scanner 14 and thus over a very long service life of the device for detecting the moisture content of the laundry 24 and the tumble dryer 2 to be properly recorded and used for the control or regulation of the tumble dryer 2. In the present embodiment, the scanner 14 and the device for detecting the moisture content are designed such that maintenance or repair of the Scanner 14 over the total service life of the clothes dryer 2, that is to say over its entire service life, is not required. Customer service calls in this regard are therefore unnecessary.

Die Erfindung ist nicht auf das vorliegende Ausführungsbeispiel beschränkt. Beispielsweise ist die Erfindung insbesondere in dem professionellen Bereich, also bei Wäschetrocknern für den professionellen Einsatz, vorteilhaft verwendbar. Anstelle von zwei Kontaktbändern ist es auch möglich, lediglich ein einziges mit einer der Trommelrippen elektrisch leitfähig verbundenes Kontaktband zu verwenden. Der andere Schleifkontakt kann dann beispielsweise direkt auf der Außenfläche des Trommelmantels der Trockentrommel schleifend anliegen. Diese Ausbildung ist in dem professionellen Bereich üblich. Denkbar ist jedoch auch, dass einer der Kontakte der Einrichtung zur Erfassung des Feuchtegehalts der Wäsche nicht an dem Trommelmantel, sondern an einem Trommelboden der Trockentrommel schleifend anliegt. Auch ist es möglich, dass einer der Kontakte nicht als ein Schleifkontakt ausgebildet ist. Beispielsweise ist es denkbar, einen derartigen Kontakt an einer Trommelkappe der Trockentrommel anzuordnen.The invention is not restricted to the present exemplary embodiment. For example, the invention can be used advantageously in particular in the professional field, that is to say in tumble dryers for professional use. Instead of two contact strips, it is also possible to use only a single contact strip which is electrically conductively connected to one of the drum ribs. The other sliding contact can then abut, for example, directly on the outer surface of the drum shell of the drying drum. This training is common in the professional field. However, it is also conceivable that one of the contacts of the device for detecting the moisture content of the laundry does not abut the drum jacket, but rather on a drum base of the drying drum. It is also possible that one of the contacts is not designed as a sliding contact. For example, it is conceivable to arrange such a contact on a drum cap of the drying drum.

Bei einer Mehrzahl von Schleifkontakten ist es nicht zwingend erforderlich, dass die einzelnen Schleifkontakte zueinander materialgleich ausgeführt sind. Entsprechend ist es möglich, den elektrisch leitfähigen Kunststoff je nach den Erfordernissen des Einzelfalls bei der jeweiligen Paarung von Schleifkontakt und Trockentrommel oder Schleifkontakt und Kontaktband geeignet auszuwählen.In the case of a plurality of sliding contacts, it is not absolutely necessary for the individual sliding contacts to be of the same material as one another. Accordingly, it is possible, depending on the requirements of the individual case, to select the electrically conductive plastic in a suitable manner for the respective pairing of sliding contact and drying drum or sliding contact and contact strip.

Claims (6)

  1. Scanner (14) for a device for measuring a moisture content of laundry (24) located in a tumble dryer (2) having a rotatable drying drum (4), comprising a holder (16) and at least one sliding contact (18, 20) which is resiliently mounted on the holder (16) for sliding contact on a contact belt (8, 10), arranged on the drying drum (4), or on the drying drum of the tumble dryer, characterised in that the sliding contact (18, 20) is formed from an electrically conductive plastics material.
  2. Scanner (14) according to claim 1, characterised in that the sliding contact (18, 20) has a sliding friction coefficient, dynamic against steel, of less than or equal to 0.6, preferably less than or equal to 0.4, particularly preferably less than or equal to 0.2.
  3. Scanner (14) according to either claim 1 or claim 2, characterised in that the sliding contact (18, 20) has an electrical resistance of less than or equal to 100 ohms, preferably less than or equal to 1 ohm, particularly preferably less than or equal to 0.01 ohms.
  4. Scanner (14) according to any of claims 1 to 3, characterised in that the sliding contact (18, 20) is suitable for long-term use at a temperature of greater than or equal to 140°C and is suitable for short-term use at a temperature of greater than or equal 180°C.
  5. Device for measuring a moisture content of laundry (24) located in a tumble dryer (2) having a rotatable drying drum (4), comprising a scanner (14) that comprises a holder (16) and at least one sliding contact (18, 20) which is resiliently mounted on the holder (16) for sliding contact on a contact belt (8, 10), arranged on the drying drum, (4) or on the drying drum of the tumble dryer, characterised in that the scanner (14) is designed according to any of claims 1 to 4.
  6. Tumble dryer (2) having a rotatable drying drum (4), comprising a device for measuring a moisture content of laundry (24) located in the drying drum (4), comprising a scanner (14) that comprises a holder (16) and at least one sliding contact (18, 20) which is resiliently mounted on the holder (16) for sliding contact on a contact belt (8, 10), arranged on the drying drum (4), or on the drying drum of the tumble dryer, characterised in that the scanner (14) is designed according to any of claims 1 to 4.
EP19169708.5A 2018-04-25 2019-04-17 Scanner for a device for measuring moisture content of laundry, device and laundry dryer Active EP3561173B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102018109894.4A DE102018109894A1 (en) 2018-04-25 2018-04-25 Scanner for a device for detecting a moisture content of a laundry, device and tumble dryer

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EP3561173A1 EP3561173A1 (en) 2019-10-30
EP3561173B1 true EP3561173B1 (en) 2020-06-24

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EP19169708.5A Active EP3561173B1 (en) 2018-04-25 2019-04-17 Scanner for a device for measuring moisture content of laundry, device and laundry dryer

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DE (1) DE102018109894A1 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6214900A (en) * 1985-07-12 1987-01-23 株式会社東芝 Operation controller of dryer
DE4437635C2 (en) * 1994-10-21 2001-03-08 Miele & Cie Device for recording the moisture content in the laundry for a tumble dryer
DE102007039707A1 (en) * 2007-08-22 2009-07-30 Miele & Cie. Kg Clothes dryer with a holding device
EP2377989A1 (en) * 2010-04-13 2011-10-19 Electrolux Home Products Corporation N.V. Method of assembling the drum of a laundry drier and drum for laundry driers

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
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DE102018109894A1 (en) 2019-10-31

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