[0001] The present invention refers to an improved kind of clothes drying machine, both
of the front-loading and the top-loading type, as well as of the condenser type, provided
with a rotating drum and a drive motor to rotatably drive said rotating drum, and
further provided with blower means, or fans, for forcedly circulating air in respective
drying and condenser cooling ducts, wherein said drying machine is particularly compact
in size, and wherein said two fans and said rotating drum are capable to be driven
to independently rotate at different speeds that bear no correlation with each other.
[0002] Household condenser-type clothes drying machines are largely known in the art to
have to be provided with means needed to rotatably drive both fans used to circulate
air in the drying circuit and the condenser-cooling circuit, as well as - of course
- to rotatably drive in a selective manner also the rotating drum in which the items
to be dried are tumbled.
[0003] In manufacturing this kind of clothes drying appliances, use has normally been made
since the beginning of a first electric motor to drive said two fans, and a second
electric motor to rotatably drive the drum.
[0004] However, such solution - while functionally effective - proved soon quite expensive
and demanding from a construction and manufacturing point of view, owing mainly to
the need for two distinct, either asynchronous or induction, i.e. inherently rather
expensive electric motors to be provided.
[0005] Furthermore, installing such two motors inside a standard-type household clothes
drying machine gives rise to a number of rather tricky mounting problems, since such
two motors are rather bulky and, as a result, design engineers have to go to extremes
in trying to make the best out of the generally scanty space available inside this
kind of appliances.
[0006] A measure that has in the meanwhile been taken in the art in view of solving this
particular problem lies in the use of a single electric drive motor for linking to
both the driven pulleys of the two distinct fans and the driven pulley of the drum.
[0007] Such solution, which is certainly an optimum one from a purely construction point
of view, has however a number of hardly surmountable drawbacks from a functional point
of view, i.e.:
- a) in the first place, the rotating speeds of the two fans and the rotating drum become
rigidly correlated with each other, owing to such components being in fact rigidly
connected mechanically to such single driving motor; as a result, since the rotating
speed of the drum (approx. 55 rpm) must be kept substantially constant, it practically
ensues that even the flow rates of the air in the drying and condenser-cooling circuits
become constant, although it would quite on the contrary be appropriate and fully
desirable for the flow rates of the air in said circuits to be able to be varied -
even to quite an appreciable extent - in accordance with and during the various steps
through which a drying cycle is progressing;
- b) in addition, when the direction of rotation of the drum is cyclically reversed,
the same drum is caused to stop for a short time and this quite obviously also causes
the air in the two circuits to be stopped from flowing; owing to safety reasons -
which anyone skilled in the art is well aware of - even the heating elements used
to heat up the drying air require to be de-energized during these reversal periods,
and such need does of course not fail to introduce a number of construction and manufacturing
complications, along with a corresponding reduction in the overall reliability of
the appliance due to the need for power at line voltage to be frequently and repeatedly
switched off and on during a drying cycle.
[0008] From
DE 103 31 949 B3, the preamble of claims 1 and 2, from
US 2005/0016015 A1 and from
US 6,745,495 B1 it is divulged a kind of laundry drying of one electric motor for driving the drum
into rotation, and of a second electric motor able of driving into rotation one or
the two fans of two conduits of respective airflows; however such solution appears
to be quite expensive due to the fact to provide two distinct electric motors, and
especially to the fact that said two motors are rather bulky and so require a specific
and difficult design of the whole machine due to the need to lodge them and the relevant
associated pulleys, belts etc. in a very careful way.
[0009] From
DE 19636705 a laundry drying machine is known, in which the same electric motor is arranged to
drive the drum rotation and the fan to circulate the flow of warm drying air; this
case is not to be considered as relevant prior art as it is not provided with a second
fan, which obviously has to be properly driven into rotation, moreover in said case
the respective speed of the drum and the fan rotations are at a fixed ratio to each
other, therefore inhibiting any speed flexibility and optimization.
[0010] It would therefore be desirable, and it is actually a main object of the present
invention, to provide a condenser-type clothes drying machine, which is adapted to
operate in a selectively controllable manner as far as both the rotating speed and
the direction of rotation of the drum and the rotating speed, and therefore also the
related air flow rates, of the two fans of the drying and condenser-cooling circuits
are concerned, wherein such clothes drying machine shall be at the same time capable
of being provided by doing away with the drawbacks generally encountered in the prior
art, where use is made of two bulky motors taking up two respective, distinct large
spaces within the appliance.
[0011] According to the present invention, these aims are reached in a particular kind of
condenser-type clothes drying machine, according to the features of claims 1 and 2,
respectively, which may be of both the front-loading and the top-loading type, as
well as of the inclined-axis type, and which is provided with two motors for distinctly
driving the rotating drum and the two fans provided in the respective drying and condenser-cooling
circuits, as described below by way of non-limiting example with reference to the
accompanying drawings, in which:
- Figure 1 is a symbolical view of the drum and the functionally most important circuits
of a drying machine according to the prior art;
- Figure 2 is a schematical view of the drum and the two distinct drying and condenser-cooling
air circuits, as well as the drum rotation driving arrangement, in a clothes drying
machine according to the present invention;
- Figure 3 is a median sectional view through the axis of the motors of the two electric
motors and the related mechanical connections in a clothes drying machine according
to the present invention;
- Figure 4 is a is a median sectional view of the assembly of the two electric motors
shown in Figure 3, in an improved embodiment of the present invention;
- Figure 5 is a is a median sectional view of the assembly of the two electric motors
shown in Figure 4, in a further improved embodiment of the present invention;
- Figure 6 is a schematical view of the drum and the two distinct drying and condenser-cooling
air circuits, with distinct driving means for the rotating drum and the two fans,
according to an improved embodiment of the present invention;
- Figure 7 is a median sectional view through the axis of the motors of the three electric
motors and the related mechanical connections in the machine that is represented schematically
in Figure 6.
[0012] With reference to Figures 1 and 2, a clothes drying machine according to the present
invention comprises a rotating drum 1, a first drying-air duct 2 circulating a flow
of hot air through said drum and collecting the hot moisture-laden air exiting the
drum to convey it through a condenser 3, from which said flow of air is sent again
- upon being heated up anew by the heating elements 14 - into the drum 1; it further
comprises a first fan 4 provided to forcedly circulate a flow of air in and through
said first duct 2, a second duct 5 that takes air in from the outside and conveys
it - by the action of an appropriately provided second fan 6 - into and through said
condenser 3, from which this flow of cooling air is eventually exhausted outside.
[0013] With reference to Figures 2 and 3, to rotatably drive said two fans and said rotating
drum there are provided two electric motors, which are arranged and connected as described
below.
[0014] Basically, said two motors 7, 8 are arranged coaxially, and a first motor 7 is adapted
to rotatably drive the respective first shaft 9, which extends through said first
motor 7, and whose two end portions 10, 11 are arranged on the opposite sides of said
motor.
[0015] To said two shaft end portions there are applied two respective pulleys 12, 13, round
which there are passing respective driving belts (not shown).
[0016] Of course, depending on or according to also the actual physical configuration of
the various parts and members of the machine, as well as the location or arrangement
thereof, it will at this point be also possible and/or advantageous for the two fans
4 and 6 not to be connected to respective belts passing round and driving said pulleys
12 and 13, but rather shrink-fitted or press-fitted on to said first shaft 9. However,
this is a solution that represents a technical equivalent and falls outside the actual
scope of the present invention, so that said pulleys 12 and 13 will be further referred
to as general means for transmitting the rotational motion to the two fans 4 and 6
throughout the following description.
[0017] The second electric motor 8 is arranged between said first motor 7 and an end portion
11 of said first shaft 9, wherein said second motor 8 is provided with a respective
second shaft 14 made in the form of a hollow cylinder and so sized as to be able to
contain said first shaft therewithin.
[0018] These two shafts are not engaging each other, nor they are in contact with each other,
so that each shaft is able to freely rotate independently of each other.
[0019] A third pulley 15 is applied on to the second shaft 14.
[0020] With reference to Figure 4, in view of keeping outer dimensions as compact as possible,
said third pulley 15 is located on the section of said second shaft lying on the side
that is opposite to the one where the first motor is located - of course, with respect
to said second motor.
[0021] The possibility is given in this way for said two motors to be brought as close as
possible to each other, thereby ensuring a first achievement of the present invention.
[0022] A most advantageous improvement of the invention comprises providing the inventive
clothes drying machine with suitable control and actuation means (not shown, owing
to them being largely known as such in the art), which are adapted to act on said
two motors in an independent manner.
[0023] Since the two fans can be rotatably driven in a synchronized manner at mutually correlated
speeds, each one of them is connected, preferably via driving belts or similar means
of a
per se known type, to a respective one of said two pulleys 12, 13 fitted on to said first
shaft 7; on the contrary, the rotating drum 1 is connected - again via
per se known means - to said third pulley 15.
[0024] In this way, said two motors may be controlled and rotatably driven in a manner that
is fully independent of each other, and - most obviously - this enables not only the
rotating speed of said two fans to be varied in a fully independent manner with respect
to the rotating speed of the drum, but also the drum to be driven to rotate in the
two opposite directions, while keeping the direction of rotation of the fans unaltered.
It can therefore be most readily appreciated that the possibility is given in this
way for the direction of rotation of the drum to be reversed without the power supply
to the heating elements having to be at the same time cut off, since the flow of drying
air is in fact able to independently go on uninterruptedly, along with the flow of
condenser-cooling air, thereby practically reaching a second aim of the present invention.
[0025] These advantages of the present invention may be still further enhanced to an appreciable
extent if said two motors 7 and 8 are permanent-magnet motors, which are largely known
to be very compact and to require a considerably smaller mounting space as compared
with the motors that are traditionally used in this kind of applications.
[0026] In this way, and with particular reference to Figure 5, both said motors can be accommodated
and supported together within a same and single housing 20 that has typically the
same overall size, and therefore takes up the same mounting space, as just a single
one of the two traditional asynchronous or induction motors that are used in prior-art
clothes drying machines.
[0027] It can therefore be readily noticed and appreciated that the combination of some
of the afore-described features of the invention and, in particular, the combination
of such features as:
- a single housing 20,
- two permanent-magnet motors accommodated and supported within said single and same
housing,
- the coaxial arrangement of said two motors enabling them to be mounted within said
single and same housing,
- the provision of the shaft of one of said motors in the form of a hollow sleeve enabling
the other shaft to pass through it, thereby enabling said two motors to be mounted
in a juxtaposed arrangement and, as a result, taking up the smallest possible space,
makes it possible for a clothes drying machine to be ultimately embodied, which is
optimized as far as both the size of and the space occupied by the two internal motors
and the overall functional flexibility thereof are concerned.
[0028] With reference now to Figures 6 and 7, a further improved embodiment of the present
invention comprises taking advantage of the compact size and low space requirements
of permanent-magnet motors in view of accommodating in said single and same housing
20 not the fan driving motor 7 and the drum driving motor 8, but rather three distinct
motors, i.e. a first motor 7A, a second motor 7B, and a third motor 8 that operates
to drive the rotating drum as in the afore-considered embodiment.
[0029] For reasons of greater simplicity and clarity, the same reference numerals as in
the previous Figures have been used - wherever this has proved possible - in Figures
6 and 7 to indicate similar parts and details.
[0030] In practice, the motor 7 is split up into two separate motors 7A and 7B, respectively,
which are independently linked to respective ones of said two fans 4 and 6 via respective
mechanically unconnected shafts 9 and 9A.
[0031] With such solution, owing to said three distinct motors 7A, 7B and 8 being of course
capable of being controlled and rotatably driven independently of each other, the
ultimate result can be obtained of being able to also control - in a similarly independent
manner - the rotating speed of the fans relative to each other, i.e. a possibility
that proves particularly valuable in some specific steps during the drying cycle,
such as for instance during the initial phase thereof, when the fan of the condenser-cooling
air circuit may be driven to operate at a much slower rotating speed, or even kept
at a standstill, without any loss in performance, but with an improvement as far as
quietness and energy usage are concerned.
1. Household condenser-type clothes drying machine, both of the front-loading or the
top-loading type, comprising:
- a rotating drum (1),
- a first duct (2) adapted to enable a first flow of heated-up air to be circulated
in a closed-loop flowpath through said drum and through an appropriately provided
condenser (3),
- a first fan (4) adapted to circulate said first flow of heated-up air along said
first duct,
- a second duct (5) adapted to enable a respective second flow of ambient or cooled-down
air to be circulated through said condenser (3),
- a second fan (6) adapted to circulate said second flow of air along said second
duct,
- said first fan, said second fan and said rotating drum (1) being rotatably driven
by appropriate driving means,
characterized in that said driving means comprise:
- two distinct electric motors (7, 8) in a substantially coaxial arrangement (X),
- in which a first electric motor (7) rotatably drives a respective first shaft (9)
that is provided with two end portions, one (10) of said end portions lying on a side
of said motor and the other one (11) on the opposite side thereof,
- first and second separate motion-transmission means, preferably comprised of first
and second pulleys (12, 13) and respective belts, engaging respective ones of said
two end portions (10, 11) of said first shaft (9),
- in which the second electric motor (8) is arranged between said first electric motor
(7) and an end portion (11) of said first shaft (9),
- in which said second electric motor (8) is provided with a respective second shaft
(14) in the form of a cylindrical hollow sleeve, inside which said first shaft is
housed,
- in which on a side of said second hollow shaft (14) there is provided a related
third motion-transmission means that may include a related third pulley (15).
2. Household condenser type clothes drying machine according to the preamble of claim
1,
characterized in that said driving means comprise:
- three distinct electric motors (7A, 7B, 8) in a substantially coaxial arrangement
(X),
- in which a first electric motor (7A) rotatably drives a respective first shaft (9)
that is provided with first motion-transmission means (13) connected to a first fan,
- in which the third electric motor (8) is provided with a respective third shaft
(14) in the form of a cylindrical hollow sleeve, said first shaft (9) being accommodated
therewithin,
- in which the second electric motor (7B) is provided with a respective second shaft
(9A), which is positioned on the opposite side of said first shaft (9) with respect
to said first electric motor (7A) and is in turn provided with respective second motion-transmission
means (12) at an end portion thereof, said second electric motor being in turn positioned
on the opposite side of said first electric motor (7A) relative to said third motor
(8),
- in which on to a side of said third hollow shaft (14) there is provided a third
motion-transmission means being a shrink-fitted or press-fitted third pulley (15).
3. Clothes drying machine according to claim 1, characterized in that said third motion-transmission means include a third pulley and said third pulley
(15) is press-fitted on to the side of said second hollow shaft on the opposite side
of said first motor relative to said second motor.
4. Clothes drying machine according to claim 1 or 2, characterized in that each one of said first and second motion-transmission means (12, 13) is connected
to a respective one of said first and second fans (4, 6), and in that said third motion-transmission means include third pulley (15), which is connected
to means transmitting rotary motion to said rotating drum (1).
5. Clothes drying machine according to claim 1, 3 or claims 1 and 4, characterized in that there is provided a single housing (20) accommodating both said electric motors (7,
8), said first shaft (9) being protruding from said single housing (20), and said
second shaft (14)being shaped in the form of a hollow sleeve protruding outwards therefrom.
6. Clothes drying machine according to claim 2 or claims 2 and 4, characterized in that there is provided a single housing (20) accommodating all of said three electric
motors (7A, 7B, 8), said first shaft (9), and said second shaft (9A) being protruding
from said single housing (20), and said third shaft (14) being shaped in the form
of a hollow sleeve protruding outwards therefrom.
7. Clothes drying machine according to any of the preceding claims, characterized in that said electric motors are permanent-magnet motors.
8. Clothes drying machine according to any of the preceding claims, characterized in that it is provided with control means that are adapted to operatively control said electric
motors in a manner that is fully independent of each other.
1. Frontlader- und Toplader-Haushalt-Wäschetrockner vom Kondensatortyp, der Folgendes
umfasst:
- eine rotierende Trommel (1),
- eine erste Leitung (2), die dazu ausgeführt ist, die Zirkulation eines ersten Stroms
erhitzter Luft in einem geschlossenen Strömungskreis durch die Trommel und durch einen
zweckmäßig angeordneten Kondensator (3) zu ermöglichen,
- einen ersten Ventilator (4), der geeignet ist, den ersten Strom erhitzter Luft entlang
der ersten Leitung zu zirkulieren,
- eine zweite Leitung (5), die geeignet ist, die Zirkulation eines entsprechenden
zweiten Stroms von Umgebungsluft oder abgekühlter Luft durch den Kondensator (3) zu
ermöglichen,
- einen zweiten Ventilator (6), der geeignet ist, den zweiten Luftstrom durch die
zweite Leitung zu zirkulieren,
- wobei der erste Ventilator, der zweite Ventilator und die rotierende Trommel (1)
von einem entsprechenden Antriebsmittel drehbar angetrieben werden,
dadurch gekennzeichnet, dass das Antriebsmittel Folgendes umfasst:
- zwei getrennte Elektromotoren (7, 8) in einer im wesentlichen koaxialen Anordnung
(X),
- wobei ein erster Elektromotor (7) drehbar eine zugehörige erste Welle (9) antreibt,
die mit zwei Endabschnitten versehen ist, wobei einer (10) dieser Abschnitte auf einer
Seite des Motors liegt und der andere (11) auf der gegenüber liegenden Seite desselben,
- erste und zweite getrennte Bewegungsübertragungsmittel, vorzugsweise bestehend aus
ersten und zweiten Riemenscheiben (12, 13) und zugehörigen Riemen, die eine Verbindung
mit den jeweils zugehörigen der zwei Endabschnitte (10, 11) der ersten Welle (9) aufnehmen,
- wobei der zweite Elektromotor (8) zwischen dem ersten Elektromotor (7) und einem
Endabschnitt (11) der ersten Welle (9) angeordnet ist,
- wobei der zweite Elektromotor (8) mit einer zugehörigen zweiten Welle (14) in Form
einer zylindrischen, hohlen Hülse ausgestattet ist, innerhalb derer die erste Welle
untergebracht ist,
- wobei auf einer Seite der zweiten Hohlwelle (14) ein zugehöriges drittes Bewegungsübertragungsmittel
vorgesehen ist, das eine zugehörige dritte Riemenscheibe (15) umfassen kann.
2. Haushalt-Wäschetrockner vom Kondensatortyp gemäß dem Oberbegriff von Anspruch 1,
dadurch gekennzeichnet, dass das Antriebsmittel umfasst:
- drei getrennte Elektromotoren (7A, 7B, 8) in einer im wesentlichen koaxialen Anordnung
(X),
- wobei ein erster Elektromotor (7A) drehbar eine erste zugehörige Welle (9) antreibt,
die mit einem ersten Bewegungsübertragungsmittel (13) ausgestattet ist, das mit einem
ersten Ventilator verbunden ist,
- wobei der dritte Elektromotor (8) mit einer zugehörigen dritten Welle (14) in Form
einer zylindrischen, hohlen Hülse ausgestattet ist, wobei die erste Welle (9) in derselben
untergebracht ist,
- wobei der zweite Elektromotor (7B) mit einer zugehörigen zweiten Welle (9A) ausgestattet
ist, die auf der gegenüber liegenden Seite der ersten Welle (9) mit Bezug zu dem ersten
Elektromotor (7A) positioniert ist und ihrerseits mit einem zugehörigen zweiten Bewegungsübertragungsmittel
(12) an einem Endabschnitt derselben versehen ist, wobei der zweite Elektromotor seinerseits
auf der gegenüber liegenden Seite des ersten Elektromotors (7A) in Bezug zu dem dritten
Motor (8) angeordnet ist,
wobei auf einer Seite der dritten Hohlwelle (14) ein drittes Bewegungsübertragungsmittel
vorgesehen ist, bei dem es sich um eine aufgeschrumpfte oder verpresste dritte Riemenscheibe
(15) handelt.
3. Wäschetrockner gemäß Anspruch 1, dadurch gekennzeichnet, dass das dritte Bewegungsübertragungsmittel eine dritte Riemenscheibe umfasst und diese
dritte Riemenscheibe (15) auf der Seite der zweiten Hohlwelle auf der gegenüber liegenden
Seite des ersten Motors mit Bezug auf den zweiten Motor verpresst ist.
4. Wäschetrockner gemäß Anspruch 1 oder 2, dadurch gekennzeichnet, dass jedes der ersten und zweiten Bewegungsübertragungsmittel (12, 13) mit einem der ersten
und zweiten Ventilatoren (4, 6) verbunden ist und dass das dritte Bewegungsübertragungsmittel
eine dritte Riemenscheibe (15) umfasst, die mit einem Mittel verbunden ist, das die
Drehbewegung auf die rotierenden Trommel (1) überträgt.
5. Wäschetrockner gemäß Anspruch 1, 3 oder 1 und 4, dadurch gekennzeichnet, dass ein einzelnes Gehäuse (20) vorgesehen ist, in dem beide Elektromotoren (7, 8) untergebracht
sind, wobei die erste Welle (9) von dem einzelnen Gehäuse (20) vorspringt und die
zweite Welle (14) in Form einer hohlen Hülse daraus auswärts vorragt.
6. Wäschetrockner gemäß Anspruch 2 und 4, dadurch gekennzeichnet, dass ein einzelnes Gehäuse (20) vorgesehen ist, in dem alle drei Elektromotoren (7A, 7B,
8) untergebracht sind, wobei die erste Welle (9) und die zweite Welle (9A) aus dem
einzelnen Gehäuse (20) vorragen und die dritte Welle (14) in Form einer hohlen Hülse
daraus auswärts vorragt.
7. Wäschetrockner gemäß einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Elektromotoren Permanentmagnetmotoren sind.
8. Wäschetrockner gemäß einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass dieser mit einem Steuerungsmittel ausgestattet ist, das geeignet ist, die Elektromotoren
jeweils vollkommen unabhängig voneinander operativ zu steuern.
1. Sèche-linge domestique du type à condenseur, à la fois du type à chargement frontal
ou à chargement par le haut, comprenant:
- un tambour tournant (1),
- une première conduite (2) apte à permettre à un premier écoulement d'air chauffé
à circuler selon un chemin d'écoulement en boucle fermée à travers ledit tambour et
à travers un condenseur (3) réalisé d'une manière appropriée,
- un premier ventilateur (4) apte à faire circuler ledit premier écoulement d'air
chauffé le long de ladite première conduite,
- une deuxième conduite (5) apte à permettre la circulation d'un deuxième écoulement
respectif d'air ambiant ou refroidi à travers ledit condenseur (3),
- un deuxième ventilateur (6) apte à faire circuler ledit deuxième écoulement d'air
le long de ladite deuxième conduite,
- ledit premier ventilateur, ledit deuxième ventilateur et ledit tambour tournant
(1) étant entraînés en rotation par des moyens d'entraînement appropriés,
caractérisé en ce que lesdits moyens d'entraînement comprennent:
- deux moteurs électriques distincts (7, 8) en un agencement sensiblement coaxial
(X),
- où un premier moteur électrique (7) entraîne en rotation un premier arbre respectif
(9) qui est pourvu de deux portions d'extrémité, une (10) desdites portions d'extrémité
se situant sur un côté dudit moteur et l'autre (11) sur son côté opposé,
- des premier et deuxième moyens de transmission de mouvement séparés, constitués
de préférence de première et seconde poulies (12, 13) et de courroies respectives,
venant en prise avec des portions respectives desdites deux portions d'extrémité (10,
11) dudit premier arbre (9),
- où le deuxième moteur électrique (8) est agencé entre ledit premier moteur électrique
(7) et une portion d'extrémité (11) dudit premier arbre (9),
- où ledit deuxième moteur électrique (8) est pourvu d'un deuxième arbre respectif
(14) sous la forme d'un manchon cylindrique creux, à l'intérieur duquel ledit premier
arbre est logé,
- où sur un côté dudit deuxième arbre creux (14) est réalisé un troisième moyen de
transmission de mouvement apparenté qui peut comprendre une troisième poulie apparentée
(15).
2. Sèche-linge domestique du type à condenseur selon le préambule de la revendication
1,
caractérisé en ce que lesdits moyens d'entraînement comprennent:
- trois moteurs électriques distincts (7A, 7B, 8) en un agencement sensiblement coaxial
(X),
- où un premier moteur électrique (7A) entraîne en rotation un premier arbre respectif
(9) qui est muni d'un premier moyen de transmission de mouvement (13) relié à un premier
ventilateur,
- où le troisième moteur électrique (8) est muni d'un troisième arbre respectif (14)
sous la forme d'un manchon cylindrique creux, ledit premier arbre (9) étant logé dans
celui-ci,
- où le deuxième moteur électrique (7B) est muni d'un deuxième arbre respectif (9A)
qui est positionné sur le côté opposé dudit premier arbre (9) par rapport audit premier
moteur électrique (7A) et est muni à son tour d'un deuxième moyen de transmission
de mouvement respectif (12) à une portion d'extrémité de celui-ci, ledit deuxième
moteur électrique étant à son tour positionné sur le côté opposé dudit premier moteur
électrique (7A) relativement audit troisième moteur (8),
- où sur un côté dudit troisième arbre creux (14), il est réalisé un troisième moyen
de transmission de mouvement qui est une troisième poulie ajustée par contraction
ou ajustée par pression (15).
3. Sèche-linge selon la revendication 1, caractérisé en ce que lesdits troisième moyens de transmission de mouvement comprennent une troisième poulie
et ladite troisième poulie (15) est ajustée par pression sur le côté dudit deuxième
arbre creux sur le côté opposé dudit premier moteur relativement audit deuxième moteur.
4. Sèche-linge selon la revendication 1 ou 2, caractérisé en ce que chacun desdits premier et deuxième moyens de transmission de mouvement (12, 13) est
relié à un ventilateur respectif parmi lesdits premier et deuxième ventilateurs (4,
6), et en ce que lesdits troisième moyens de transmission de mouvement comprennent une troisième poulie
(15) qui est reliée à des moyens transmettant un mouvement de rotation audit tambour
de rotation (1).
5. Sèche-linge selon la revendication 1, 3 ou les revendications 1 et 4, caractérisé en ce qu'il est réalisé un seul logement (20) recevant les deux moteurs électriques (7, 8),
ledit premier arbre (9) faisant saillie dudit logement unique (20), et ledit deuxième
arbre (14) étant réalisé sous la forme d'un manchon creux faisant saillie vers l'extérieur
à partir de celui-ci.
6. Sèche-linge selon la revendication 2 ou les revendications 2 et 4, caractérisé en ce qu'il est réalisé un seul logement (20) recevant tous les trois moteurs électriques (7A,
7B, 8), ledit premier arbre (9) et ledit deuxième arbre (9A) faisant saillie dudit
logement unique (20), et ledit troisième arbre (14) étant réalisé sous la forme d'un
manchon creux faisant saillie vers l'extérieur à partir de celui-ci.
7. Sèche-linge selon l'une quelconque des revendications précédentes, caractérisé en ce que lesdits moteurs électriques sont des moteurs à aimant permanent.
8. Sèche-linge selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il est muni de moyens de commande qui sont conçus pour commander fonctionnellement
lesdits moteurs électriques selon des manières qui sont complètement indépendantes
les unes des autres.