EP0110318B1 - Wäschetrockner mit Sicherheitsvorrichtung gegen Überhitzung der Wäsche - Google Patents

Wäschetrockner mit Sicherheitsvorrichtung gegen Überhitzung der Wäsche Download PDF

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Publication number
EP0110318B1
EP0110318B1 EP83111728A EP83111728A EP0110318B1 EP 0110318 B1 EP0110318 B1 EP 0110318B1 EP 83111728 A EP83111728 A EP 83111728A EP 83111728 A EP83111728 A EP 83111728A EP 0110318 B1 EP0110318 B1 EP 0110318B1
Authority
EP
European Patent Office
Prior art keywords
lever
drum
spring
machine
laundry
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
EP83111728A
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English (en)
French (fr)
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EP0110318A1 (de
Inventor
Franco Del Frate
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.)
OFFERTA DI LICENZA AL PUBBLICO
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Industrie Zanussi SpA
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Publication date
Application filed by Industrie Zanussi SpA filed Critical Industrie Zanussi SpA
Priority to AT83111728T priority Critical patent/ATE25534T1/de
Publication of EP0110318A1 publication Critical patent/EP0110318A1/de
Application granted granted Critical
Publication of EP0110318B1 publication Critical patent/EP0110318B1/de
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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
    • D06F58/00—Domestic laundry dryers
    • D06F58/02—Domestic laundry dryers having dryer drums rotating about a horizontal axis
    • D06F58/04—Details 
    • D06F58/08—Driving arrangements
    • 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
    • D06F34/10—Power supply arrangements, e.g. stand-by circuits

Definitions

  • the invention refers to a laundry dryer according to the precharacterising part of claim 1.
  • a laundry dryer of this kind is known from US-A-3 890 719 and US-A-3 890 720.
  • the spring acts on the lever so as to tension the belt.
  • the lever actuates the breaker switch means due to the load of the spring so that the electrical circuit of the heater element and the motors is interrupted.
  • GB-A-839 471 discloses a similar arrangement in a washing machine in which a lever bearing a tensioning roll acting upon a driving belt also acts on a switch so that upon possible rupture of the belt the switch is opened in order to interrupt the power supply to the electrical equipment of the washing machine.
  • All of the aforementioned structures fail to interrupt the electrical circuits upon breakage of the lever tensioning means so that the electrical equipment of the respective machine may further be supplied with electric current although the motor is unable to rotate the drum due to the slackening of the belt.
  • the object of the present invention to provide a laundry dryer of the aforementioned kind which is secured against an overheating whenever the drum is stopped due to rupture of the belt or breakage of the spring loading the lever carrying the tensioning roll.
  • a laundry dryer comprises a frame 5 and a drum 6 mounted therein for rotation about an horizontal axis and adapted to contain the laundry to be dried.
  • the machine further comprises a blower and at least one electric heater element (not shown) for generating a flow of heated air through drum 6.
  • Drum 6 is adapted to be rotated by an electric motor 8 provided with a belt pulley 9 and mounted on a support 10 at the lower rear portion of the frame of the machine.
  • drum 6 is rotated with the aid of a conventional transmission belt 11 extending around pulley 9 of motor 8 and around drum 6 and kept under tension by means of a tension roll 12.
  • Tension roll 12 is carried by a lever 13 pivotally mounted at one end thereof on the frame of the machine adjacent motor 8.
  • Tension roll 12 is continually biased into engagement with belt 11 by a return spring 14 having its respective end anchored to lever 13 and support 10.
  • the described laundry dryer is further provided with a safety device for preventing possible overheating and burning of the laundry in case of rupture or excessive elongation of belt 11.
  • the safety device in the embodiment shown essentially comprises an electric breaker switch 15 and an associated slider element 16, both mounted on a support 17 adjacent motor 8 and lever 13.
  • Switch 15 is provided with a spring-loaded button 18 cooperating with a normally open contact 19 connected to the electric circuitry of the machine in a manner to be described.
  • Slider element 16 is adapted to slide back and forth along a horizontal guide 20 of support 17. Slider element 16 is connected to lever 13 by a compression spring 21 and provided with a plane surface portion 22 for actuating button 18.
  • Plane surface portion 22 is dimensioned such as to retain button 18 in its depressed state, and thus contact 19 in its closed position, also in case of small displacements of slider element 16 due to the action of the resilient transmission belt 11 on tension roll 12 and lever 13 during rotation of drum 6.
  • contact 19 is connected in series with the program unit 23 of the machine, said unit being adapted to control the connection and disconnection, respectively, of the two motors 8 and 26 driving the blower and drum, respectively, and of the heater element 27, itself connected in series with a conventional protective thermostat 28.
  • contact 19 is kept closed in the manner described, permitting electric power to be simultaneously supplied to motors 8 and 26 and heater element 27 in series with thermostat 28.
  • drum 6 stops and lever 13 is displaced in the direction of arrow A by the action of return spring 14, resulting in a corresponding displacement of slider element 16 by the action of spring 21 (fig. 1).
  • slider element 16 is also displaced in the direction of arrow B by the action of spring 21, whereby plane surface portion 22 is again cause to release button 18.
  • button 18 and contact 19 assuming their rest positions as above described, so that motors 8 and 26 and heater element 27 with thermostat 28 are again disconnected from the electric power supply.
  • FIG. 2 Shown in fig. 2 is a laundry dryer equipped with a safety device in a second embodiment of the invention.
  • the above described elements of the dryer are designated by the same reference numerals as in fig. 1.
  • the safety device essentially comprises two breaker switches 29 and 30 facing each other over a short spacing and fixedly mounted in the machine adjacent motor 8 and lever 13, and a slider element 31 carried by a support 32 secured to the machine in a position adjacent switches 29 and 30.
  • Each breaker switch 29 and 30 is provided with a spring-loaded button 33 and 34, respectively, cooperating with a normally closed electric contact 35 and 36, respectively, said contacts being connected to the electric circuitry of the machine in a manner to be described.
  • Slider element 31 is adapted to slide back and forth between a pair of parallel horizontal guides 37 and 38 of support 32, and is connected to lever 13 by a compression spring 39.
  • Slider element 31 is further provided with a projection 40 located at a position between the buttons of the two breaker switches so as to be able to selectively actuate one or the other thereof.
  • projection 40 are selected so as to permit limited displacement of slider element 31 under the resilient action of transmission belt 11 on tension roll 12 and lever 13 during rotation of drum 6 without projection 40 coming into contact with one of the two. buttons.
  • contacts 35 and 36 are connected in series with each other and with program unit 23 of the machine, the program unit being in turn connected to the electric components of the machine in the above described manner.
  • slider element 31 does not act on contacts 35 and 36, so that they remain closed during the operating cycle of dryer, permitting the electric components of the machine to be supplied with electric power by program unit 23.
  • slider element 31 In the case of rupture of transmission belt 11 or failure of return spring 14, slider element 31 is displaced in the direction of arrow A or B, respectively, under the action of lever 13 as decribed above.
  • projection 40 actuates the respective button 33 or 34, respectively, causing the respective contact 35 or 36 to open, as shown in dotted lines, so as to disconnect the electric components of the machine from the power supply.
  • Displacement of slider element 31 in one or the other direction thus results in the flow of heated air through the drum being interrupted, so as to prevent overheating and burning of the laundry from occurring.
  • the safety device according to the invention is of a simple and reliable type and may be employed in combination with conventional safety devices protecting the machine against electric failure, resulting in a laundry dryer thus being effectively protected against any failure of its electric and mechanical components.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Drying Of Solid Materials (AREA)

Claims (3)

1. Wäschetrockner, enthaltend ein Gebläse, das von einem Elektromotor angetrieben wird, und wenigstens ein Heizelement 27 zur Zirkulierung erwärmter Luft innerhalb einer Trommel (6), die die zu trocknende Wäsche enthält, wobei die Trommel (6) von einem zweiten Elektromotor (8) über wenigstens einen Transmissionsriemen (11) in Drehung versetzt wird, der sich um die Trommel (6) und eine Riemenscheibe (9) des zweiten Elektromotors (8) erstreckt une mittels wenigstens einer Spannrolle (12) unter Spannung gehalten wird, die von einem Hebel (13) getragen wird, der von einer Feder (14) belastet und schwenkbar im unteren rückwärtigen Teil der Maschine montiert ist, und weiterhin enthaltend eine Betätigungs- und Unterbrecherschaltereinrichtung (16, 31; 15, 29, 30), die mit dem Hebel (13), dem Heizelement (27) und den Motoren (8, 26) so zusammenwirkt, daß die Verbindung bzw. Abtrennung des Heizelements (27) und der Motoren (8, 26) mit bzw. von der elektrischen Stromversorgung der Maschine in Abhängigkeit der von dem Hebel (13) eingenommenen Stellung gesteuert wird, dadurch gekennzeichnet, daß die Unterbrecherschaltereinrichtung (15, 29, 30) drei mögliche Schaltstellungen hat, die von ihrem Betätigungsglied (16) bestimmt sind, nämlich eine erste Endstellung, die bei einem möglichen Bruch des Riemens (11) eingenommen wird, eine Zwischenstellung, die dem normalen Lauf der Maschine zugehörig ist, und eine zweite Endstellung, die bei einem möglichen Bruch der Feder (14) eingenommen wird, wobei die Schaltereinrichtung (15, 29, 30) in beiden Endstellungen geöffnet und in ihrer Zwischenstellung geschlossen ist.
2. Wäschetrockner nach Anspruch 1, dadurch gekennzeichnet, daß die Betätigungseinrichtung ein Schieberelement (16) enthält, das einem Unterbrecherschalter (15) zugeordnet ist, der einen Kontakt (19) hat, der das Heizelement (27) und die Motoren (8, 26) steuert, wobei das Schieberelement (16) mit dem Hebel (13) durch eine zweite Feder (21) verbunden ist und einen ebenen Oberflächenabschnitt (22) aufweist, der dazu eingerichtet ist, den Kontakt (19) in seine geschlossene Stellung in der mittleren Stellung des Schieberelements (16) oder in seine geöffnete Stellung in den beiden Endstellungen des Schieberelements (16) zu bewegen.
3. Wäschetrockner nach Anspruch 1, dadurch gekennzeichnet, daß die Betätigungs- und Unterbrecherschaltereinrichtung ein Schieberelement (31) und zwei Unterbrecherschalter (29, 30) aufweist, deren Kontakte (35, 36) in Serie miteinander geschaltet sind, um das Heizelement (27) und die Motoren (8, 26) zu steuern, wobei das Schieberelement (31) mit dem Hebel (13) durch eine Feder verbunden ist und einen Vorsprung (40) aufweist, der zwischen den Unterbrecherschaltern (29, 30) angeordnet ist, um den einen oder den anderen derselben in seine geöffnete oder geschlossene Stellung zu bewegen.
EP83111728A 1982-11-26 1983-11-23 Wäschetrockner mit Sicherheitsvorrichtung gegen Überhitzung der Wäsche Expired EP0110318B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83111728T ATE25534T1 (de) 1982-11-26 1983-11-23 Waeschetrockner mit sicherheitsvorrichtung gegen ueberhitzung der waesche.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT4573682 1982-11-26
IT45736/82A IT1205466B (it) 1982-11-26 1982-11-26 Macchina asciugabiancheria provvista di dispositivo di sicurezza contro il surriscaldamento della biancheria

Publications (2)

Publication Number Publication Date
EP0110318A1 EP0110318A1 (de) 1984-06-13
EP0110318B1 true EP0110318B1 (de) 1987-02-25

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP83111728A Expired EP0110318B1 (de) 1982-11-26 1983-11-23 Wäschetrockner mit Sicherheitsvorrichtung gegen Überhitzung der Wäsche

Country Status (4)

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EP (1) EP0110318B1 (de)
AT (1) ATE25534T1 (de)
DE (1) DE3369863D1 (de)
IT (1) IT1205466B (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2578558B1 (fr) * 1985-03-05 1988-05-20 Taiwan Electric Heating Equipm Sechoir electrique perfectionne, notamment pour le sechage de vetements
DE3543213A1 (de) * 1985-12-06 1987-06-11 Bosch Siemens Hausgeraete Schaltungsanordnung zum schutz vor ueberhitzung einer waeschetrommel
DE10330936A1 (de) * 2002-07-10 2004-01-22 Marquardt Gmbh Sensor für Riemenriß
DE10360871A1 (de) * 2003-12-23 2005-07-21 BSH Bosch und Siemens Hausgeräte GmbH Vorrichtung zur Überwachung eines Antriebsriemens einer Wäschebehandlungsmaschine
DE102007046068B4 (de) 2006-10-02 2018-06-28 Lg Electronics Inc. Vorrichtung zum Erkennen einer Riementrennung bei einem Trockner sowie Verfahren zum Erkennen dieses Vorgangs
WO2008065106A1 (en) * 2006-11-29 2008-06-05 Arcelik Anonim Sirketi A washer/dryer
CN101377051B (zh) * 2007-08-31 2012-10-31 海尔集团公司 干衣机皮带开关结构及其工作方法
CN110499610B (zh) * 2018-05-18 2021-12-17 青岛海尔洗涤电器有限公司 一种用于衣物处理设备的离合装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2750782A (en) * 1955-08-04 1956-06-19 Gen Electric Laundry apparatus
GB885171A (en) * 1959-04-15 1961-12-20 Fisher & Paykel Improvements in or relating to clothes driers
FR1404300A (fr) * 1964-08-17 1965-06-25 Siemens Elektrogeraete Gmbh Séchoir de linge à tambour
US3890719A (en) * 1974-01-25 1975-06-24 Whirlpool Co Broken belt power-disconnect system for dryers
US3890720A (en) * 1974-01-25 1975-06-24 Whirlpool Co Broken belt switch control system for clothes dryer

Also Published As

Publication number Publication date
ATE25534T1 (de) 1987-03-15
EP0110318A1 (de) 1984-06-13
DE3369863D1 (en) 1987-04-02
IT1205466B (it) 1989-03-23
IT8245736A0 (it) 1982-11-26

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