[0001] The present invention relates to laundry machines, such as washing machines, washing/drying
machines and drying machines, both for domestic and professional use. More particularly,
the present invention relates to drum lighting for such laundry machines.
[0002] Each household and professional laundry machine - such as washing machine, washing/drying
machines and drying machines - typically comprises, among other components, an inner
compartment accessible by a user (
e.g., through a proper access door and/or lid) for loading/unloading the laundry; in the
case of a washing machine or washing/drying machine the inner compartment includes
a washing tub housing a rotatable drum in which the laundry can be loaded/unloaded,
while in the case of a drying machine the inner compartment includes a rotatable drum
in which the laundry can be loaded/unloaded.
[0003] As known, in such machines, whether of the front-loading type or of the top-loading
type, the inside of the drum is scarcely enlightened by external environment especially
when the user accesses the drum during the loading/unloading of the laundry.
[0004] Therefore, laundry loading/unloading operations become difficult and uncomfortable
for the user.
[0005] In order to solve this drawback, some laundry machines are provided with a lighting
system, which substantially comprises one or more lightning device - incandescent
light lamps, fluorescent light lamps, discharge light lamps or solid-state lighting
devices (
e.g., high power LEDs) - acting as corresponding light-emitting elements for illuminating
the drum.
[0006] According to a first known solution, the lighting system may be arranged inside the
drum (
e.g., in drum walls and/or in lifters inside the drum). Nevertheless, the Applicant has
recognized that the approach providing a light-emitting element within the drum is
intrinsically difficult to implement - substantially due to the fact that the light-emitting
element, which is arranged on a portion of the machine (
i.e., the drum) adapted to rotate with respect to the casing of the machine, has to be
electrically connected with the supply electric assembly, which is instead stationary
with respect to the casing.
[0007] Moreover, it may occur that laundry items stored inside the drum cover the light-emitting
element, thus impeding a functional enlightenment of the drum.
[0008] According to a second known solution, the light-emitting element is provided in a
frame or hopper provided in correspondence of the loading/unloading opening of the
casing and encompassing the loading/unloading opening. The Applicant has found that
this solution implies several drawbacks, too. For example, properly installing the
light-emitting element within the frame/hopper is a difficult and time-consuming task.
Furthermore, the frame/hopper robustness may be lowered by the insertion of the light-emitting
element. Moreover, it is difficult to effectively direct the light radiation emitted
by the light-emitting element towards the inside of the drum.
[0009] Other known solutions provide a light-emitting element within the washing tub. For
example,
DE 4026547 discloses a washing machine that incorporates a horizontally rotating perforated
laundry drum contained inside a washing solution container. The washing solution container
jacket features a detergent and/or fresh water supply opening and/or vent opening
with an associated supply line. An illuminating body is built into the supply line
in such a way that its light discharge face is directed at the drum jacket. The machine
provides for the possibility of illuminating the inner space of the drum through the
drum perforation. The illuminating body requires no special fastening as it is integrated
in the supply line.
[0010] DE 10316377 discloses a machine with a fixed lamp fastened to the machine housing on the axis
of the drum. It shines onto a flat end of the transparent rod which extends through
a hollow drive shaft. The rod has a convex or angled end projecting into the interior
of the drum. The drum is mounted on roller bearings and has a drive motor arrangement
at the end.
[0011] The Applicant has found that enlightening the inside of the drum through bores of
the same has a low efficiency. Indeed, the bores in the drum have usually a small
diameter, this lead to a scarce enlightening of the inside of the drum, since the
light radiation permeating the inside of the drum results scattered and has a low
intensity.
[0012] The drawbacks of the known solutions are exacerbated by the fact that, in order to
meet users requirements, the drum of most of modern machines has increased size for
ensuring the required high laundry-capacity, which has repercussions on energy consumption,
reliability and complexity aspects of the lighting system.
[0013] The Applicant has handled the problem of devising a satisfactory solution able to
provide a satisfactory enlightenment of the inside of the drum, thus facilitating
inspection thereof and laundry loading/unloading tasks, at the same time, overcoming
the above-discussed drawbacks.
[0014] Such solution is achieved by providing a lightning system having a light-emitting
element provided in a stationary part of the laundry machine (for example, in the
case of a washing machine or a washing/drying machines, the stationary part may advantageously
be the washing tub, which is stationary with respect to the rotating drum, or, in
the case of a drying machines, which typically is not provided with a tub, the stationary
part may be the casing or the frame of the machine, which is stationary with respect
to the rotating drum), a light permeable portion on the drum arranged in such a way
that a light-radiation emitted by the light-emitting element is able to enter the
drum via such a light-permeable portion, and a transparent element mounted inside
the drum in correspondence of the light-permeable portion, adapted to allow the light
radiation emitted by the light-emitting element, and crossing the light-permeable
portion, to reach and thoroughly enlightening the inside of the drum.
[0015] One aspect of the present invention proposes a laundry machine for treating laundry
items. The laundry machine comprises an outer casing, which rotatably houses a drum
having a cylindrical drum for accommodating the items to be treated, and a lighting
system for enlightening the inside of the drum. At least one light-permeable portion
formed in the drum. The lighting system includes a light-emitting element provided
on a stationary portion of the laundry machine, for emitting a light radiation towards
the cylindrical drum wall. Moreover, a transparent element is mounted inside the drum
in correspondence of said light-permeable portion; the transparent element allows
the light radiation emitted by said light-emitting element crossing said light-permeable
portion and reaching the inside of the drum. In the solution according to an embodiment
of the present invention, the at least one light-permeable portion is formed in the
cylindrical drum wall of the drum.
[0016] Preferred features of the present invention are set in the dependent claims.
[0017] In an embodiment of the invention, the drum may be adapted to be rotated in a predetermined
position in which said light-permeable portion and said transparent element are axially
aligned with the light-emitting element.
[0018] In an embodiment of the invention, the transparent element may be adapted to direct
the light radiation towards a central portion inside the drum.
[0019] In an embodiment of the invention, the transparent element may be adapted to uniformly
diffuse the light radiation.
[0020] In an embodiment of the invention, the transparent element may be provided on a top
edge portion of the hollow main body.
[0021] In an embodiment of the invention, the hollow main body may comprise an open base
surface opposite to the top edge portion, said open base surface encompassing the
light-permeable portion.
[0022] In an embodiment of the invention, the transparent element may engage the hollow
main body of the cover element by means of a snap-fit engagement.
[0023] In an embodiment of the invention, the cover element may be a lifter adapted to improve
the tumbling of items during the laundry machine operation.
[0024] In an embodiment of the invention, the laundry machine may further comprise a holder
in the stationary portion of the laundry machine for housing the light-emitting element.
[0025] In an embodiment of the invention, the laundry machine may further comprise a light
focuser, coupled with the light-emitting element adapted to focus the light radiation
generated by said light-emitting element towards the drum wall.
[0026] In an embodiment of the invention, the laundry machine may further comprise a transparent
cap adapted to close the holder, for sealing the light-emitting element away from
liquids and/or moisture comprised in the stationary portion of the laundry machine.
[0027] These, and others, features and advantages of the solution according to the present
invention will be better understood by reading the following detailed description
of an embodiment thereof, provided merely by way of exemplary and non-limitative example,
to be read in conjunction with the attached drawings, wherein:
Figure 1 schematically shows a cross-sectional side view of a top-loading laundry machine
according to an embodiment of the present invention;
Figure 2 schematically shows cross-sectional view of an enlarged portion of the laundry machine
of Figure 1, with a lighting system according an embodiment of the present invention; and
Figure 3A and Figure 3B schematically show an isometric view and an isometric exploded view, respectively,
of a lifter according to an embodiment of the present invention.
[0028] Considering
Figure 1 and
Figure 2 together, there are shown a cross-sectional and enlarged side views, respectively,
of a laundry machine
100 according to an embodiment of the present invention.
[0029] The laundry machine
100 is a machine for treating laundry (such has a laundry washing machine, a laundry
washing/drying machine, a laundry drying machine
etc.) of the top-loading type. Anyway, it should be apparent from the following description
that also laundry machines of the front-loading type may also benefit from the solution
according to the present invention.
[0030] In the example at issue, the laundry machine
100 comprises a substantially parallelepiped-shaped casing
105 that, preferably, although not necessarily, encloses a substantially cylindrical-shaped
tub
110 (it is underlined that the tub is advantageously provided in the case of a washing
machine or a washing/drying machine, while the tub is not provided in case of a drying
machine), wherein the laundry is treated, along with any other component of the laundry
machine
100 necessary for the operation (
e.g., hydraulic, electronic and electromechanical apparatuses well known in the art and,
therefore, not herein described for sake of conciseness).
[0031] With reference to enclosed Figures 1 and 2, which represent the case of a top-loading
washing machine, which therefore comprises a tub, the tub
110 is preferably fixed to a frame
115 (which substantially supports the casing
105 and any other component comprised in the laundry machine
100), preferably by supporting elastic coils (one of which visible in
Figure 1, therein identified with the numeral
120), and shock (and vibration) absorber elements, such as two shock absorbers
125 (which absorb jolts of the tub during operation).
[0032] Furthermore, the tub
110 houses a substantially cylindrical-shaped rotating drum
130, which, in operation, rotates about an axis A in order to tumble the laundry to be
washed. Preferably, although not necessarily, one or more baffles or lifters
135a and
135b (two shown in the figures) are mounted on a drum wall
130a (parallel to a drum rotation axis A) in the inside of the drum
130 for enhancing the tumbling action on laundry performed in operation by the same.
[0033] Conversely, in some laundry machines (for example, in dryer-type laundry machines),
no tub is provided and the drum may advantageously be enclosed by the casing of the
laundry machine; for example, in the case of a drying machine, the drum is preferably
rotatably supported by a number of wheels provided in the base of the machine, inside
the casing.
[0034] In the example of
Figures 1 and
2, in order to allow a user to access the tub
110, an opening
140 is advantageously provided on the top of the washing machine
100. The opening
140 is closable by a lid (removed in the
Figure 1), which is preferably, although not necessarily, hingeably connected to the casing
105 by means of a hinge (not shown in the figure). The lid is adapted to pivot from a
closed position - wherein the lid closes the opening
140, impeding the access to the tub
110 - to an open position - wherein the lid is pivoted to an angle, preferably, equal to,
or greater than, 90° with respect to the closed position, allowing the access to the
tub
110.
[0035] Similarly, in order to allow a user to access the inside of the drum
130 (for loading/unloading the laundry), a drum opening is provided in the drum wall
130a and a door
145 is provided for closing the same during operation. Preferably, although not limitatively,
the door
145 comprises a first door leaf
145a and a second door leaf
145b.
[0036] In the example illustrated in the enclosed figures, the first door leaf
145a is advantageously hinged to the drum
130 by a first leaf hinge
150a, while the second door leaf
145b is hinged to the drum
130 by a second leaf hinge
150b. Preferably, in a closed position, interlocking elements (not shown in the figure)
block the first and the second door leaves
145a and
145b to one another, thus impeding any unwanted (and harmful) opening of the door
145 during operation (
i.e., when the drum rotates).
[0037] Clearly, in a further embodiment, not illustrated, the door may comprise a single
door leaf; the following description refers to a door comprising two door leaves,
but it can as well be applied to a door comprising a single door leaf (for example
when, in the following, reference is made to the "first door leaf', it can be read
also as "single door leaf' in case the door comprises only a single door leaf).
[0038] In order to have the door
145 in an open position (shown in the
Figure 1), the laundry machine
100, at the end of the operation, preferably aligns the door
145 with the opening
140 - alternatively or in addition, the user may align the door
145 with the opening
140 manually -; then the interlocking elements have to be unlocked, and the first and
second door leaves
140a and
140b are preferably automatically rotated (preferably by elastic devices provided preferably
in their hinges) until they abuts against - or reach a predetermined minimum distance
from - a bellow
155 connecting the tub
110 to the border of the opening
140, or, if the bellows is not provided, abuts directly against the border of the opening
140.
[0039] Having the machine lid (not illustrated in enclosed drawings) and the drum door
145 both in the open position, the inside of the drum
130 is accessible (through the drum opening) by the user for loading/unloading the laundry
stored therein.
[0040] In addition, preferably, although not limitatively, a user interface
160, for the selection of laundry treatment parameters (
e.g., a temperature of a treatment fluid, a maximum rotation speed of the drum
130, etc.), is provided, preferably on the top of the casing
105.
[0041] In the laundry machine according to the present invention, a lighting system is provided
for enlightening the inside of the drum.
[0042] Preferably, in the solution according to the present invention, the lighting system
comprises at least a light-emitting element
165 provided on a stationary portion of the machine (
i.e., any suitable part of the laundry machine for supporting the light-emitting element
that does not rotates with the drum in operation;
e.g., the tub, the casing the frame
etc.), adapted to enlighten the inside of the drum. Advantageously, the light-emitting
element
165 is arranged in the stationary portion of the machine in such a way that a light-radiation
emitted by such a light-emitting element
165 reaches the drum
130, directly, or via a light permeable and/or conductive element, for example a light-guide,
not illustrated.
[0043] Moreover, a light-permeable portion (
e.g., an aperture
202 in the drum wall, or a transparent insert fixed in any suitable manner -
e.g. by over-molding - on the drum wall
130a or constructed in a single piece with the same) is provided in the drum wall
130a, which light-permeable portion is arranged in such a way that a light radiation emitted
by the light-emitting element
165 and reaching the drum wall
130a can enter the drum
130 by the light-permeable portion, thus allowing a thoroughly enlightenment of the inside
of the drum
130,
[0044] In an advantageous embodiment the light-permeable portion of the drum wall
130a and the light emitting element
165 are arranged in such a way that when the drum
130 is in a predetermined angular position (for example, in the case of a top-loading
washing machine, is in the position allowing the opening of the door
145) the light emitting element
165 faces and is aligned with the light-permeable portion of the drum wall
130a, so that light enters the drum
130 and illuminates the inside of the latter. Advantageously, a cover element may be
provided over the light permeable portion of the drum wall
130a, such cover element preferably comprising a transparent element for allowing the light
radiation to enter inside the drum
130.
[0045] In the example at issue, a light-emitting element
165 may advantageously be provided on a wall
110a of the tub
110. Conversely, in laundry machine of the dryer type a light-emitting element
165 may be provided on an internal surface of the casing, on the frame of the laundry
machine or on an electronic board comprised in the laundry machine (
e.g., the electronic board comprising an electronic control unit of the laundry machine),
and positioned/arranged in such a way that a light radiation emitted by the light-emitting
element
165 is able to enter the drum
130 via such the light-permeable portion of the wall
130a of the latter.
[0046] As already mentioned, a light-permeable portion, such as an aperture
202 is preferably provided on the drum wall
130a. It should be noted that the light-permeable portion may advantageously be formed
by a glass or a transparent polymer insert fixed in the drum wall
130a in any suitable manner, or monolithically formed with the same (
e.g. by over-molding); for example, in the case of a drying machine, the light-permeable
portion may advantageously be monolithically formed with the drum wall, thus maintaining
the inside of the drum sealed from the rest of the laundry machine.
[0047] In the advantageous embodiment illustrated in enclosed figures, at a predetermined
position of the drum
130 (as will be described in the following), an axial alignment (
i.e., both the light-emitting element
165 and the light-permeable portion -
e.g. the aperture
202 - share a same symmetry axis B) between the light-emitting element
165 and the light-permeable portion -
e.g. the aperture
202 - is possible (as will be described in greater detail in the following), since the
tub wall
110a and the drum wall
130a are parallel one another.
[0048] The light-emitting element
165 is preferably mounted in a holder
205, for example a recess in the tub wall. Advantageously, the light-emitting element
165 may comprise any suitable lighting device
210, such as an incandescent light lamp, a fluorescent light lamp, a discharge light lamp
or a solid-state lighting device (
e.g., a LED - Light Emitting Diode). It should be noted that the lightning device
210 might comprise more than just one of the lighting devices listed above (
e.g., the lightning device
210 may comprise a plurality of LEDs in a strip or a ring arrangement) in order to obtain
a desired illumination intensity (
i.e., able to grant a satisfactory enlightenment of the drum
130)
.
[0049] Similarly, in laundry machines without the tub, the light-emitting element may be
enclosed in a box-like holder affixed, for example, to a casing or a frame portion
of the laundry machine.
[0050] The lightning device
210 may advantageously be supplied with electric power in any known way; for example,
the lightning device
210 may be supplied by a power circuit comprised in the laundry machine
100, a selective connection with the mains or a battery arrangement (not shown in the
figures).
[0051] It is underlined that, in the present application, expression "light-emitting element"
has not to be interpreted only as a lamp or a similar "light-generating" device, but
it refers to any device adapted to emit light radiation, for example the edge of an
optical fiber, or of a light-guide (
e.g., the free edge of a cylinder made of transparent plastics or glass). For example,
such device may be adapted to guide light radiation - generated by a lightning device
placed elsewhere in the laundry machine - towards the drum.
[0052] Advantageously, a light focuser
215 may be coupled with the light-emitting element
165, designed to focus a light radiation generated by the lightning device
210 preferably towards the drum wall
130a. For example, the light focuser
215 may have a shape of a truncated elliptic paraboloid with the light-emitting device
165 placed at a truncated opened end and with the opposite opened end facing the drum
130.
[0053] Preferably, although not necessarily, a cap
220 made of a transparent material, may be provided for closing the holder recess
205. In this way, the light-emitting element
165 may be advantageously sealed in the holder
205, thus, protected from treating liquids and/or moisture comprised in the tub
110 (at least during the operation of the laundry machine
100).
[0054] The holder
205 - and, therefore, the light-emitting element
165 - may advantageously be provided in such a way to prevent a user (looking inside the
drum
130) from being directly hit by the light radiation emitted by the light-emitting element
165, thus preventing glare and dazzling effects. For example, the light-emitting element
165 may be provided in a top portion of the tub wall
110a (thus, also the probability of the light radiation resulting hindered by laundry
inside the tub is substantially nullified).
[0055] The light-permeable portion, -
e.g. the aperture
202, in the drum wall
130a may have any suitable shape (
i.e., ranging from rectangular to circular) and, preferably, has a size adapted to let
pass the whole light radiation emitted by the light-emitting element
165 into the drum
130.
[0056] A cover element, such as the lifter
135b may be advantageously mounted on the drum wall
130a (facing the inside of the drum
130) in correspondence of the light-permeable portion (e.g., the aperture
202) provided in the drum wall
130a.
[0057] The lifter
135b may be mounted in any know way, such as by means of screws, glue or a snap-fit arrangement.
It should be noted that, the lifter
135b, being mounted over the light-permeable portion (
e.g., the aperture
202), prevents laundry in the drum from obstructing such the light-permeable portion
(
e.g., the aperture
202), and/or if the light-permeable portion comprises the aperture
202, also prevents laundry form falling in the tub
110 via the aperture
202 (possibly, provoking malfunctions of the laundry machine
100 in operation and/or damaging the laundry itself).
[0058] Considering now
Figure 3A and
Figure 3B, there are schematically shown an isometric view and an isometric exploded view, respectively,
of the lifter
135b according to an embodiment of the present invention.
[0059] The lifter
135b advantageously comprises a hollow main body
305 being substantially triangular prism-shaped with an opened base surface. In addition,
the lifter comprises a transparent portion, such as a transparent element
310 adapted to be engaged with the main body
305. For example, the engagement between the transparent element
310 and the main body
305 may be provided by a snap-fit arrangement
315.
[0060] The main body
305 and the transparent element
310 may advantageously be made of any suitable material, such as a polymer for the former
and a transparent polymer for the latter.
[0061] Preferably, although not limitatively, the transparent element
310 may be provided on a top edge portion
320 of the main body
305 opposed to an open base surface
325 thereof, in order to transmit the light radiation (incoming from the light-emitting
element
165, as will be described in following) through the light-permeable portion (
e.g., the aperture
202) into the drum
130.
[0062] Advantageously, the transparent element
310 may range in length, from a minimum extension - allowing the transmission of light
radiation with a sufficient intensity inside the drum
130 -, to a maximum extension, substantially equal to a length of the top edge portion
320 - for the transmission of light radiation with the highest intensity achievable (in
this embodiment of the present invention).
[0063] Advantageously, the transparent element
310 may be shaped with a curvature adapted to direct the light radiation towards a central
portion (corresponding to the rotation axis A) inside the drum
130 in order to enlightening the same with a high intensity. This central portion inside
the drum
130 results to be preeminently used by the user during the laundry loading/unloading
operations; thus, proper enlightenment of such central portion inside the drum
130 is crucial for the user.
[0064] Alternatively, the transparent element
310 may be shaped with a curvature adapted to uniformly diffuse the light radiation (
i.e., diffusing the light radiation substantially in an isotropic manner) in the inside
of the drum
130. In this way, the inside of the drum
130 results substantially completely and evenly enlightened.
[0065] In a further embodiment (not shown) according to the present invention, the transparent
element may be formed integral (
e.g. by over-molding or co-molding) with the lifter.
[0066] In other embodiments (not shown) according to the present invention, the lifter may
be completely made of a transparent material, thus being adapted to transmit the light
radiation with any of its parts. In this case, the lifter advantageously comprises
only a transparent main body, itself acting as the transparent element previously
described.
[0067] Having described the structure of the laundry machine
100, the operation of the lightning system according to an embodiment of the present
invention will now be described, referring to all the accompanying figures together.
[0068] Preferably, although not necessarily, the light-emitting element
165 may be forced to emit a light radiation only when the laundry treatment is not in
action (
i.e., when the drum is not rotating). Even more preferably, the light-emitting element
165 may be forced to emit the light radiation only when the drum
130 is in a predetermined position (
e.g., by means of a electromechanical switch, not shown, that closes when the drum
130 is rotated in the predetermined position); for example, when the drum
130 is in a position allowing the drum door
145 to be opened (
i.e., with both the door leaves
145a and
145b in the open position).
[0069] In some embodiments, the lightning device may, advantageously, be adapted to emit
a light radiation automatically when the lid (or a door in front-loading type laundry
machines) is in the open position.
[0070] Alternatively or in addition, a pushbutton (not shown) may be provided in the user
interface
160 allowing a user to selectively force the light radiation emission by the light-emitting
element
165.
[0071] Advantageously, the lifter
135b is mounted on the drum
130 (covering the light-permeable portion -
e.g. the drum aperture
202-) in such a way that, when the drum
130 is in the predetermined position, also the lifter
135b results axially aligned with the light-emitting element
165 (as shown in
Figure 1 and
Figure 2). In this way, by passing trough the light-permeable portion (
e.g. the aperture
202) in the drum wall
130a and trough the transparent element
310 of the lifter
135b the light radiation emitted by the light emitting source
165 is able to reach into the drum
130 with a sufficient intensity in order to thoroughly enlighten the same.
[0072] It should be noted that the lifter
135b, along with transmitting the light radiation into the drum
130 thanks to the transparent element
310, also enhances the tumbling action, as do the lifters known in the art during the
laundry machine
100 operation.
[0073] In other embodiments according to the present invention, the lifter
135b may be omitted, and a transparent panel (acting as light-permeable element) may be
provided in a single-piece construction (single-body) with the drum. In this way,
the light radiation can pass through such transparent panel, while laundry in the
drum is prevented from falling in the tub (possibly, provoking malfunctions in laundry
machine operation and/or damaging the laundry itself). Similarly, in laundry machines
with no tub (such as dryer-type laundry machine), the transparent panel grants a proper
sealing of the inside of the drum from the rest of the laundry machine (thus preventing
any unwanted moisture and/or steam - present in the drum during operation - dispersion
inside the casing and/or in the environment).
[0074] The lightning system according to the present invention is able to provide a satisfactory
enlightenment of the inside of the drum, thus facilitating inspection thereof and
laundry loading/unloading tasks. At the same time, the lightning system according
to the present invention overcomes the above-discussed drawbacks with a robust and
cost-effective solution.