U.S. patent application number 10/471629 was filed with the patent office on 2004-09-09 for electric washing machine.
Invention is credited to Eifuku, Yuji, Kuroda, Koichi, Mae, Shinji, Mamiya, Haruo, Onishi, Katsuji.
Application Number | 20040172985 10/471629 |
Document ID | / |
Family ID | 26613117 |
Filed Date | 2004-09-09 |
United States Patent
Application |
20040172985 |
Kind Code |
A1 |
Mamiya, Haruo ; et
al. |
September 9, 2004 |
Electric washing machine
Abstract
An electric washing machine according to the present invention
performs a washing process with the use of electrolyzed water. When
the level of supplied water reaches an electrolyzing water level
which is lower than a washing water level, energization of an
electrolyzing device (31) is started. At this time, air is supplied
into an electrolyzing chamber (32) by an air pump (89), so that
water in the electrolyzing chamber (32) is caused to flow, thereby
assisting efficient electrolysis of the water. The water thus
electrolyzed has an enhanced cleaning capability thereby to improve
the washing performance of the washing machine.
Inventors: |
Mamiya, Haruo; (Osaka,
JP) ; Onishi, Katsuji; (Osaka, JP) ; Eifuku,
Yuji; (Osaka, JP) ; Kuroda, Koichi; (Osaka,
JP) ; Mae, Shinji; (Osaka, JP) |
Correspondence
Address: |
RABIN & Berdo, PC
1101 14TH STREET, NW
SUITE 500
WASHINGTON
DC
20005
US
|
Family ID: |
26613117 |
Appl. No.: |
10/471629 |
Filed: |
May 10, 2004 |
PCT Filed: |
March 27, 2002 |
PCT NO: |
PCT/JP02/02975 |
Current U.S.
Class: |
68/12.05 ;
68/12.18; 68/17R |
Current CPC
Class: |
C11D 11/007 20130101;
D06F 34/30 20200201; D06F 2105/58 20200201; C02F 2201/4613
20130101; D06F 35/004 20130101; C02F 1/46109 20130101; D06F 43/007
20130101; C02F 2201/4619 20130101; C02F 2001/46185 20130101; D06F
35/002 20130101; D06F 35/003 20130101; C02F 2201/46125 20130101;
D06F 2101/20 20200201 |
Class at
Publication: |
068/012.05 ;
068/012.18; 068/017.00R |
International
Class: |
D06F 035/00 |
Foreign Application Data
Date |
Code |
Application Number |
Apr 5, 2001 |
JP |
2001-106923 |
Apr 27, 2001 |
JP |
2001-133252 |
Claims
What is claimed is:
1. An electric washing machine comprising a washing tub for
containing laundry, water level detecting means for detecting a
level of water supplied into the washing tub, and an electrolyzing
device for electrolyzing the water in use for a washing process to
impart a cleaning capability to the water without addition of a
detergent, the electric washing machine characterized by
energization controlling means which starts energizing of the
electrolyzing device for the electrolysis when the water level
detecting means senses that the level of the water contained in the
washing tub reaches a predetermined water level which is lower than
a water level required for a washing or rinsing operation after
water supply into the washing tub is started for the washing or
rinsing operation.
2. An electric washing machine comprising a washing tub for
containing laundry, an electrolyzing device for electrolyzing water
in use for a washing process to impart a cleaning capability to the
water without addition of a detergent, and energization controlling
means for controlling energization of the electrolyzing device for
the electrolysis, the electrolyzing device including an
electrolyzing chamber, at least one pair of electrodes disposed in
the electrolyzing chamber, and a water communication path which
permits communication between the electrolyzing chamber and the
washing tub for water passage, the electric washing machine
characterized by air supplying means for supplying air into the
electrolyzing chamber from a lower portion of the electrolyzing
chamber, wherein the air supplying means supplies the air during
the energization by the energization controlling means.
3. An electric washing machine comprising a washing tub for
containing laundry, an electrolyzing device for electrolyzing water
in use for a washing process to impart a cleaning capability to the
water without addition of a detergent, and energization controlling
means for controlling energization of the electrolyzing device for
the electrolysis, the energization controlling means including
means for detecting an energization electric current, wherein the
energization controlling means changes conditions for the
energization of the electrolyzing device according to the detected
energization electric current.
4. An electric washing machine comprising a washing tub provided in
a housing for containing laundry, an electrolyzing device for
electrolyzing water in use for a washing process to impart a
cleaning capability to the water without addition of a detergent,
and energization controlling means for controlling energization of
the electrolyzing device for the electrolysis, the housing having
an openable lid covering a loading port through which the laundry
is loaded into and unloaded from the washing tub, the energization
controlling means including means for detecting the opening and
closing of the lid, wherein the energization controlling means
stops the energization upon detection of the opening of the
lid.
5. An electric washing machine comprising a washing tub for
containing laundry and washing the laundry therein, and an
electrolyzing device for electrolyzing water in use for a washing
process to impart a cleaning capability to the water without
addition of a detergent, the electric washing machine characterized
by washing controlling means which selectively effects a first
course in which the detergent is added to water contained in the
washing tub for a washing operation and a second course in which
the water electrolyzed by the electrolyzing device is employed for
the washing operation without the addition of the detergent to the
water contained in the washing tub, and intermediate dehydration
period reducing means for reducing a period of an intermediate
dehydrating operation to be performed after the washing operation
or a rinsing operation when the second course is effected by the
washing controlling means as compared with that when the first
course is effected.
6. An electric washing machine comprising a washing tub for
containing laundry and washing the laundry therein, and an
electrolyzing device for electrolyzing water in use for a washing
process to impart a cleaning capability to the water without
addition of a detergent, the electric washing machine characterized
by washing controlling means which selectively effects a first
course in which the detergent is added to water contained in the
washing tub for a washing operation and a second course in which
the water electrolyzed by the electrolyzing device is employed for
the washing operation without the addition of the detergent to the
water contained in the washing tub, and water drainage period
reducing means for reducing a period of water drainage from the
washing tub when the second course is effected by the washing
controlling means as compared with that when the first course is
effected.
7. An electric washing machine comprising a washing tub for
containing laundry, and an electrolyzing device for electrolyzing
water in use for a washing process to impart a cleaning capability
to the water without addition of a detergent, the electric washing
machine characterized by energization controlling means which,
where the detergent is added to water contained in the washing tub
for the washing process, stops energization of the electrolyzing
device during a washing operation but effects the energization of
the electrolyzing device during a rinsing operation.
8. An electric washing machine comprising a washing tub for
containing laundry and washing the laundry therein, and an
electrolyzing device for electrolyzing water in use for a washing
process to impart a cleaning capability to the water without
addition of a detergent, the electric washing machine characterized
by washing controlling means which selectively effects a first
course in which the detergent is added to water contained in the
washing tub for a washing operation and a second course in which
the water electrolyzed by the electrolyzing device is employed for
the washing operation without the addition of the detergent to the
water contained in the washing tub, wherein the energization
controlling means reduces a period of energization of the
electrolyzing device or an energization electric current when the
first course is effected as compared with that when the second
course is effected.
9. An electric washing machine comprising a washing tub for
containing laundry, and an electrolyzing device for electrolyzing
water in use for a washing process to impart a cleaning capability
to the water without addition of a detergent, the electric washing
machine characterized by energization controlling means which,
where a dry-cleaning course is predefined for performing the
washing process with the use of a dry-cleaning detergent, performs
one of three control operations in the dry-cleaning course, the
three control operations including a control operation in which
energization of the electrolyzing device is stopped and control
operations in which an energization period or an energization
electric current is reduced as compared with that in a course
accompanying the energization of the electrolyzing device.
10. An electric washing machine comprising a washing tub for
containing water and laundry and washing the laundry therein by
agitating the water and the laundry, the electric washing machine
characterized by water treatment means for electrolyzing the water
to impart a cleaning capability to the water, and air bubble
generating means for generating minute air bubbles by injecting air
into the water.
Description
TECHNICAL FIELD
[0001] The present invention relates to an electric washing
machine.
PRIOR ART
[0002] Electric washing machines usually perform a washing process
with the use of a detergent.
SUMMARY OF THE INVENTION
[0003] It is an object of the present invention to provide an
electric washing machine which is capable of washing laundry
without the use of a detergent. Further, the present invention is
directed to an electric washing machine which uses a drastically
reduced amount of a detergent.
[0004] In accordance with a first aspect of the present invention,
there is provided an electric washing machine comprising a washing
tub for containing laundry, water level detecting means for
detecting a level of water supplied into the washing tub, and an
electrolyzing device for electrolyzing the water in use for a
washing process to impart a cleaning capability to the water
without addition of a detergent, the electric washing machine
characterized by energization controlling means which energizes the
electrolyzing device for the electrolysis when the water level
detecting means senses that the level of the water contained in the
washing tub reaches a predetermined water level which is lower than
a water level required for a washing or rinsing operation after
water supply into the washing tub is started for the washing or
rinsing operation.
[0005] With this arrangement, the electrolysis is started by the
energization and the timing of the start of the electrolysis is
advanced, so that the electrolysis can be carried out for a longer
period of time. As a result, water electrolyzed to a high degree or
so-called "densely electrolyzed" water can be produced, thereby
enhancing the cleaning capability.
[0006] In accordance with a second aspect of the present invention,
there is provided an electric washing machine comprising a washing
tub for containing laundry, an electrolyzing device for
electrolyzing water in use for a washing process to impart a
cleaning capability to the water without addition of a detergent,
and energization controlling means for controlling energization of
the electrolyzing device for the electrolysis, the electrolyzing
device including an electrolyzing chamber, at least one pair of
electrodes disposed in the electrolyzing chamber, and a water
communication path which permits communication between the
electrolyzing chamber and the washing tub for water passage, the
electric washing machine characterized by air supplying means for
supplying air into the electrolyzing chamber from a lower portion
of the electrolyzing chamber, wherein the air supplying means
supplies the air during the energization by the energization
controlling means.
[0007] With this arrangement, the air promotes the flow of the
water in the electrolyzing chamber, so that the water can
efficiently be electrolyzed. Therefore, densely electrolyzed water
can advantageously be obtained.
[0008] In accordance with a third aspect of the present invention,
there is provided an electric washing machine comprising a washing
tub for containing laundry, an electrolyzing device for
electrolyzing water in use for a washing process to impart a
cleaning capability to the water without addition of a detergent,
and energization controlling means for controlling energization of
the electrolyzing device for the electrolysis, the energization
controlling means including means for detecting an energization
electric current, wherein the energization controlling means
changes conditions for the energization of the electrolyzing device
according to the detected energization electric current.
[0009] This arrangement suppresses overcurrent during the
electrolysis and permits adjustment of the energization electric
current for the electrolysis when the washing process is performed
with the use of a reduced amount of the detergent. Therefore,
densely electrolyzed water can advantageously be obtained. The
energization conditions are herein changed, for example, by
changing the magnitude of the energization electric current, by
switching between continuous energization and intermittent
energization, by changing the ratio between an energization period
and a non-energized period during the intermittent energization, or
by interrupting the energization.
[0010] In accordance with a fourth aspect of the present invention,
there is provided an electric washing machine comprising a washing
tub provided in a housing for containing laundry, an electrolyzing
device for electrolyzing water in use for a washing process to
impart a cleaning capability to the water without addition of a
detergent, and energization controlling means for controlling
energization of the electrolyzing device for the electrolysis, the
housing having an openable lid covering a loading port through
which the laundry is loaded into and unloaded from the washing tub,
the energization controlling means including means for detecting
the opening and closing of the lid, wherein the energization
controlling means stops the energization upon detection of the
opening of the lid.
[0011] This arrangement gives a feeling of safety to a user.
[0012] In accordance with a fifth aspect of the present invention,
there is provided an electric washing machine comprising a washing
tub for containing laundry and washing the laundry therein, and an
electrolyzing device for electrolyzing water in use for a washing
process to impart a cleaning capability to the water without
addition of a detergent, the electric washing machine characterized
by washing controlling means which selectively effects a first
course in which the detergent is added to water contained in the
washing tub for a washing operation and a second course in which
the water electrolyzed by the electrolyzing device is employed for
the washing operation without the addition of the detergent to the
water contained in the washing tub, and intermediate dehydration
period reducing means for reducing a period of an intermediate
dehydrating operation to be performed after the washing operation
or a rinsing operation when the second course is effected by the
washing controlling means as compared with that when the first
course is effected.
[0013] With this arrangement, a process time in the second course
in which a smaller amount of the detergent is used can be reduced.
In the second course, a resistance caused due to bubbles of the
detergent can be reduced, so that a dehydration effect can be
enhanced in a shorter period of time.
[0014] In accordance with a sixth aspect of the present invention,
there is provided an electric washing machine comprising a washing
tub for containing laundry and washing the laundry therein, and an
electrolyzing device for electrolyzing water in use for a washing
process to impart a cleaning capability to the water without
addition of a detergent, the electric washing machine characterized
by washing controlling means which selectively effects a first
course in which the detergent is added to water contained in the
washing tub for a washing operation and a second course in which
the water electrolyzed by the electrolyzing device is employed for
the washing operation without the addition of the detergent to the
water contained in the washing tub, and water drainage period
reducing means for reducing a period of water drainage from the
washing tub when the second course is effected by the washing
controlling means as compared with that when the first course is
effected.
[0015] The second course in which a smaller amount of the detergent
is used suppresses the generation of the bubbles as compared with
the first course in which a greater amount of the detergent is
used, so that the water can be drained in a shorter period of time.
Therefore, a process time in the second course can be reduced by
the water drainage period reducing means.
[0016] In accordance with a seventh aspect of the present
invention, there is provided an electric washing machine comprising
a washing tub for containing laundry, and an electrolyzing device
for electrolyzing water in use for a washing process to impart a
cleaning capability to the water without addition of a detergent,
the electric washing machine characterized by energization
controlling means which, where the detergent is added to water
contained in the washing tub for the washing process, stops
energization of the electrolyzing device during a washing operation
but effects energization of the electrolyzing device during a
rinsing operation.
[0017] With this arrangement, the electrolysis is not carried out
during the washing operation employing the water containing the
detergent, but carried out only during the rinsing operation.
Therefore, the overcurrent can assuredly be prevented during the
washing operation, and a sterilizing effect can be provided during
the rinsing operation.
[0018] In accordance with an eighth aspect of the present
invention, there is provided an electric washing machine comprising
a washing tub for containing laundry and washing the laundry
therein, and an electrolyzing device for electrolyzing water in use
for a washing process to impart a cleaning capability to the water
without addition of a detergent, the electric washing machine
characterized by washing controlling means which selectively
effects a first course in which the detergent is added to water
contained in the washing tub for a washing operation and a second
course in which the water electrolyzed by the electrolyzing device
is employed for the washing operation without the addition of the
detergent to the water contained in the washing tub, wherein the
energization controlling means reduces a period of energization of
the electrolyzing device or an energization electric current when
the first course is effected as compared with that when the second
course is effected.
[0019] With this arrangement, the electrolysis is also carried out
when the detergent is added, but the energization period or the
energization electric current is reduced for suppression of
overcurrent. Thus, the water can be electrolyzed without any
problem, and provide a sterilizing effect of the electrolyzed
water.
[0020] In accordance with a ninth aspect of the present invention,
there is provided an electric washing machine comprising a washing
tub for containing laundry, and an electrolyzing device for
electrolyzing water in use for a washing process to impart a
cleaning capability to the water without addition of a detergent,
the electric washing machine characterized by energization
controlling means which, where a dry-cleaning course is predefined
for performing the washing process with the use of a dry-cleaning
detergent, performs one of three control operations in the
dry-cleaning course, the three control operations including a
control operation in which energization of the electrolyzing device
is stopped and control operations in which an energization period
or an energization electric current is reduced as compared with
that in a course accompanying the energization of the electrolyzing
device.
[0021] With this arrangement, shrinkage of clothes due to the
electrolyzed water can be suppressed in the dry-cleaning
course.
[0022] In accordance with a tenth aspect of the present invention,
there is provided an electric washing machine comprising a washing
tub for containing water and laundry and washing the laundry
therein by agitating the water and the laundry, the electric
washing machine characterized by water treatment means for
electrolyzing the water to impart a cleaning capability to the
water, and air bubble generating means for generating minute air
bubbles by injecting air into the water.
[0023] With this arrangement, the cleaning capability can be
improved by the electrolyzed water and ultrasonic waves caused when
the minute air bubbles are broken.
BRIEF DESCRIPTION OF THE DRAWINGS
[0024] FIG. 1 is a side sectional view of a fully automatic washing
machine according to one embodiment of the present invention;
[0025] FIG. 2 is a partly sectional front view of the fully
automatic washing machine shown in FIG. 1;
[0026] FIG. 3 is a partly sectional side view of a water treatment
unit;
[0027] FIG. 4 is a schematic diagram schematically illustrating the
construction of the water treatment unit as viewed from the front
side thereof;
[0028] FIG. 5 is a plan view of an operation panel for illustrating
the constructions of an operation section and a display
section;
[0029] FIG. 6 is a diagram illustrating the electrical construction
of the fully automatic washing machine according to the
embodiment;
[0030] FIG. 7 is a flow chart for explaining a washing process in a
standard course to be performed by the fully automatic washing
machine according to the embodiment;
[0031] FIG. 8 is a flow chart for explaining a washing process in a
zero detergent course to be performed by the fully automatic
washing machine according to the embodiment;
[0032] FIG. 9 is a timing chart for explaining the washing process
in the zero detergent course to be performed by the fully automatic
washing machine according to the embodiment;
[0033] FIG. 10 is a flow chart for explaining a control operation
for controlling the energization of the water treatment unit in the
zero detergent course in the fully automatic washing machine
according to the embodiment;
[0034] FIG. 11 is a circuit diagram schematically illustrating an
energization circuit and an electric current detection circuit
according to the embodiment;
[0035] FIG. 12 is a flow chart for explaining a washing process in
a zero detergent course different from the course shown in FIG. 8
in the fully automatic washing machine according to the embodiment;
and
[0036] FIG. 13 is a timing chart for explaining a preliminary
washing operation and a main washing operation to be performed by
the fully automatic washing machine according to the
embodiment.
EMBODIMENTS OF THE INVENTION
[0037] A fully automatic washing machine according to one
embodiment of the present invention will hereinafter be described
with reference to the attached drawings.
[0038] FIG. 1 is a side sectional view illustrating the
construction of the fully automatic washing machine according to
this embodiment. A bottomed cylindrical outer tub 2 is suspended in
a forwardly inclined manner within a housing 1 of the washing
machine by front suspension rods 3 and rear suspension rods 4
(though one front suspension rod and one rear suspension rod are
shown in the figure, there are two front suspension rods and two
rear suspension rods). A front upper portion of the housing 1
projects forward correspondingly to the forward projection of an
upper portion of the inclined outer tub 2. The housing 1 has a
widely open front portion 16, which is covered with a detachable
front panel 17. Therefore, an upper portion of the front panel 17
projects correspondingly to the projection of the upper portion of
the outer tub 2.
[0039] A washing/dehydration tub (inner tub) 5 having a
multiplicity of dehydration perforations formed in a
circumferential wall thereof is supported within the outer tub 2
rotatably about a dehydration shaft 6 thereof. The outer tub 2 and
the inner tub 5 constitute a washing tub according to the present
invention. A pulsator 7 (water stream generating means) for
generating water streams within the outer tub 2 for agitation of
laundry is disposed on an inner bottom portion of the inner tub 5.
A driving mechanism 10 for driving the pulsator 7 and the inner tub
5 is provided at the bottom of the outer tub 2. The driving
mechanism 10 includes the dehydration shaft 6, a pulsator shaft 9
provided in the dehydration shaft 6 for rotating the pulsator 7, a
motor 8 provided coaxially with the dehydration shaft 6 and the
pulsator shaft 9, and a clutch for switchably transmitting power of
the motor 8 only to the pulsator shaft 9 or to both the pulsator
shaft 9 and the dehydration shaft 6. The driving mechanism 10
principally rotates only the pulsator 7 in one direction or in
opposite directions in a washing operation and a rinsing operation,
and unitarily rotates the inner tub 5 and the pulsator 7 in one
direction (or in a normal direction) in a dehydrating operation.
The inner tub 5 is rotated once by each turn of the motor 8. On the
other hand, a reduction gear mechanism (not shown) is provided in a
middle portion of the pulsator shaft 9, so that the pulsator 7 is
rotated according to a reduction radio of the reduction gear
mechanism.
[0040] A water supply port 11 having a detergent container 11a for
supplying a detergent contained therein is provided on an upper
rear side of the outer tub 2. A water supply tube 12 having a water
supply valve 13 provided in a middle portion thereof is connected
to the water supply port 11. When the water supply valve 13 is
opened, tap water is supplied to the water supply port 11 from an
external tap through the water supply tube 12. Thus, the tap water
flows downward into the outer tub 2 from the water supply port 11.
One end of a water drainage tube 14 is connected to a front bottom
portion or lowermost portion of the outer tub 2. The water drainage
tube 14 is opened and closed by a water drainage valve 15. The
other end of the water drainage tube 14 is connected to an external
sewage drain through a self-standing hose not shown. The opening
and closing of the water drainage valve 15 are associated with the
switching of the aforesaid clutch. When a torque motor 26 (see FIG.
6) is not operated, the pulsator 7 is decoupled from the inner tub
5 so as to be solely rotated with the water drainage valve 15 being
closed. When the torque motor is operated to pull a wire to the
midst, the pulsator 7 is coupled to the inner tub 5 with the water
drainage valve 15 being closed. When the wire is further pulled,
the water drainage valve 15 is opened with the pulsator 7 kept
coupled to the inner tub 5.
[0041] In the washing machine according to this embodiment, the
outer tub 2 and the inner tub 5 are inclined forward as described
above, so that open tops of the outer tub 2 and the inner tub 5 are
directed forward with respect to a vertically upward direction.
That is, a center line CL of the outer tub 2 is tilted at a
predetermined tilt angle .alpha. with respect to a vertical line
VL. Thus, a user standing in front of the washing machine can
easily view the bottom of the inner tub 5 and easily take out the
laundry. A tilt angle .alpha. of about 5 degrees to about 20
degrees ensures easy take-out of the laundry, and yet suppresses
the projection of the housing 1. In this embodiment, the tilt angle
.alpha. is set at about 10 degrees.
[0042] An electrolyzing device 31 as water treatment means is
disposed on a lower portion of a circumferential wall of the outer
tub 2. The electrolyzing device 31 is provided as a unit separate
from the outer tub 2, and fixed to the outer tub 2 by screws, for
example. The electrolyzing device 31 is located on a front side of
the outer tub 2, and appears when the front panel 17 is removed.
This arrangement facilitates the repair and replacement of the
electrolyzing device 31.
[0043] The electrolyzing device 31 includes an electrolyzing
chamber 32 provided separately from the outer tub 2, a pair of
electrodes 33 disposed in the electrolyzing chamber 32, an upper
water communication path 34 connecting an upper portion 69 of the
electrolyzing chamber 32 to the outer tub 2, and a lower water
communication path 35 connecting a lower portion of the
electrolyzing chamber 32 to the outer tub 2.
[0044] The electrolyzing device 31 is located at such a vertical
position that at least parts of the pair of electrodes 33 are
submerged in water when the level of the water contained in the
outer tub 2 reaches a washing water level.
[0045] The pair of electrodes 33 include a first electrode 33a and
a second electrode 33b. The first electrode 33a and the second
electrode 33b each have a thin square plate shape. The
electrolyzing chamber 32 is configured in a thin box shape having a
smaller depth (indicated by D1 in FIG. 3) with respect to the
circumferential wall of the outer tub 2. The first electrode 33a
and the second electrode 33b are disposed in predetermined spaced
relation in the electrolyzing chamber 32 with surfaces thereof
facing toward the circumferential wall of the outer tub. This
arrangement suppresses the projection of the electrolyzing device
31 provided on the circumferential surface of the outer tub 2.
Thus, the electrolyzing device 31 is prevented from bumping against
the housing 1 when the outer tub 2 vibrates during the dehydrating
operation.
[0046] It is also conceivable that the electrolyzing chamber 32 of
the electrolyzing device 31 is provided integrally with the outer
tub 2 and the electrodes 33 are provided inside the outer tub 2. In
this case, however, it is difficult to mount the electrodes 33 in a
narrow space inside the outer tub 2 and to take out the electrodes
33 for maintenance and recycling. This is why the electrolyzing
device 31 is provided as a unit, i.e., as a water treatment unit
60, which can be mounted outside the outer tub 2.
[0047] The water treatment unit 60 is constructed so as to be
handled unitarily in the assembling. For example, the water
treatment unit has the electrolyzing chamber 32, the pair of
electrodes 33 disposed in the electrolyzing chamber 32, and the
pair of water communication paths 34, 35 extending from the
electrolyzing chamber 32, so as to solely constitute the aforesaid
electrolyzing device 31. The electrolyzing chamber 32 and the pair
of water communication paths 34, 35 are integrally formed of a
synthetic resin.
[0048] The water treatment unit 60 is mounted on a front lower
right portion of the outer tub 2 as seen from the front side
thereof in FIG. 2 in an open space defined between a corner of the
housing 1 and the outer tub 2. An energization circuit 30 (see FIG.
6) is electrically connected to the water treatment unit 60. The
energization circuit 30 has a transformer 61 and the like. The
transformer 61 which typically has a greater weight is stably fixed
to a highly strong front portion 62 of a right corner of the
housing 1 as seen from the front side thereof. The transformer 61
may be fixed to the bottom 64 of the outer tub 2. In this case, the
vibrations of the outer tub 2 can advantageously be suppressed by
utilizing the great weight of the transformer 61.
[0049] The water treatment unit 60 and the transformer 61 are
located in the vicinity of the open portion 16 of the housing 1
and, therefore, easily accessed through the open portion 16 for an
assembling operation, a maintenance operation for repair,
replacement or the like, and a disassembling operation for
recycling. Further, the water treatment unit 60 and the transformer
61 are closely located, so that electrical connection therebetween
is easily established. Since the water treatment unit 60 and the
transformer 61 are detachably fixed by screws, the aforesaid
operations can advantageously be performed.
[0050] The water treatment unit 60 and the transformer 61 are fixed
at a position remote from electrical components for controlling
motor rotation such as a rotation sensor 24 (see FIG. 6) provided
in the motor 8 and a control circuit board 65 fixed to a front left
portion 63 of the housing 1 and including an invertor driving
section 23 (see FIG. 6), and interconnection components (not shown)
connecting these components. Thus, noises caused by the transformer
61 during electrolysis can be prevented from exerting an adverse
effect on the control of the rotation of the motor 8.
[0051] As shown in FIG. 3, the electrodes 33 are disposed parallel
to the largest face, e.g., a front face portion 71, of the
thin-box-shaped electrolyzing chamber 32, and each have a plate
shape having a size corresponding to the size of the front face
portion 71. Since the electrodes 33 thus have greater areas, a
requirement for the surface areas is satisfied by a minimum number
of electrodes 33. The electrodes 33 are formed of a metal, and
disposed in opposed relation. The plate-shaped electrodes 33 are
supported at a predetermined inter-electrode pitch with opposite
sides of plate faces thereof or opposite edges thereof being held.
Opposite polarities are respectively applied to the pair of
electrodes 33 for the electrolysis of the water.
[0052] The arrangement of the electrodes 33 is not limited to the
pair of electrodes having the opposite polarities. For example,
three electrodes 33 may be disposed in juxtaposition with plate
surfaces thereof opposed to each other. Alternatively, five
electrodes 33 may be disposed in juxtaposition with plate surfaces
thereof opposed to each other. In these cases, the polarities of
the electrodes 33 are alternated so that each adjacent pair of
electrodes 33 have opposite polarities. What is important is that
at least one pair of electrodes 33 are provided. Therefore, the
following description is directed to a case where one pair of
electrodes 33 are provided.
[0053] The vertically opposite edges of the electrodes 33 are held
by the electrolyzing chamber 32. Upper edges of the electrodes 33
are held in recesses 77 formed in the electrolyzing chamber 32.
These recesses 77 are defined between a pair of ribs projecting
inward from a top face portion 75 of the electrolyzing chamber 32.
Lower edges of the electrodes 33 are held by a bottom face portion
76 of the electrolyzing chamber 32 via terminal covers 85. The
terminal covers 85 cover the lower edges of the electrodes 33, and
seal gaps between the bottom face portion 76 of the electrolyzing
chamber 32 and the lower edges of the electrodes 33 for prevention
of accumulation of lint. The electrodes 33 may be supported at
laterally opposite sides thereof.
[0054] The inter-electrode pitch (indicated by D2), more
specifically, a spacing (indicated by D3) between the electrodes
33, is preferably not smaller than 2 mm and not greater than 5 mm,
for example. If the spacing is smaller than 2 mm, the lint is
liable to come into a space between the electrodes 33 and adhere on
the electrodes, thereby reducing the electrolysis efficiency and
the durability. If the spacing is greater than 5 mm, application of
a higher voltage is required for maintaining the electrolysis
efficiency at a high level, making practical construction
difficult. With a spacing of not smaller than 2 mm and not greater
than 5 mm, a practically high durability and a high electrolysis
efficiency can be realized.
[0055] It is conceivable that the electrolyzing chamber 32 is
formed of a material different from the material for the outer tub
2 or, alternatively, of the same material as the outer tub 2. In
the latter case, the electrolyzing chamber 32 can easily be handled
for recycling thereof. For example, the electrolyzing chamber 32 is
formed of an olefin resin such as polypropylene (PP). This resin is
also employed as the material for the outer tub 2 to impart the
outer tub with a chemical resistance to water containing agents
such as a detergent and a bleaching agent. Further, addition of a
reinforcing material such as glass fibers to the material for the
electrolyzing chamber 32 advantageously suppresses reduction in the
strength of the tub due to increase in water temperature.
[0056] As shown in FIGS. 3 and 4, the electrolyzing chamber 32 has
the bottom face portion 76, the front face portion 71, a rear face
portion 72, a right side face portion 73 and a left side face
portion 74 which extend upright from the periphery of the bottom
face portion 76, and the top face portion 75. The electrodes 33 are
disposed in a space defined by the face portions 71 to 76, and
water is retained in the space. The electrolyzing chamber 32 is
configured so as to have a smaller dimension as measured from the
front face portion 71 to the rear face portion 72. The electrodes
33 are disposed generally parallel to the front face portion 71.
The electrolyzing chamber 32 is constituted by a pair of vertically
separable bodies 78, 79 (see FIG. 2).
[0057] An upper portion 69 of the electrolyzing chamber 32 is
inclined with one side thereof located at a higher position. That
is, the top face portion 75 of the electrolyzing chamber 32 is
inclined upward toward the right side thereof as seen from the
front side thereof. The upper water communication path 34 extends
from a part of the rear face portion 72 at the higher position. The
lower water communication path 35 extends from a part of the rear
face portion 72 at a lower position of the electrolyzing chamber
32.
[0058] The pair of water communication paths 34, 35 are arranged
generally parallel to each other in vertically juxtaposed relation.
The water communication paths 34, 35 are tubes having a round
section and formed integrally with the rear face portion 72 of the
electrolyzing chamber 32. The shape of the pair of water
communication paths 34, 35 is not limited to the tubular shape, as
long as spaces are defined therein for communication between the
inside of the electrolyzing chamber 32 and the inside of the outer
tub 2 for water passage. It is also conceivable to provide the
water communication paths separately from the electrolyzing chamber
32 or integrally with the outer tub 2.
[0059] The water flows into the electrolyzing chamber 32 from the
outer tub 2 through the lower water communication path 35. Water
treated in the electrolyzing chamber 32 flows out into the outer
tub 2 through the upper water communication path 34. The water is
caused to flow in this manner by the water streams generated in the
outer tub 2 by the rotation of the pulsator 7.
[0060] The way of the water flow in the pair of water communication
paths 34, 35 is not particularly limited, but it is also
conceivable that the water flows in a direction opposite to that
described above. It is merely necessary that the pair of water
communication paths 34, 35 are provided for the water inlet and the
water outlet, and it is also conceivable that at least one of the
water communication paths includes a plurality of water
communication paths, e.g., three or more water communication paths.
It is also conceivable that the pair of water communication paths
are provided unitarily or as a single water communication path. For
example, the single water communication path is not divided into
two water communication paths for the water inlet and the water
outlet, but may double as a water inlet path and a water outlet
path. The following description is directed to a case where the
lower water communication path 35 and the upper water communication
path 34 serve as the water inlet path and the water outlet path,
respectively.
[0061] As shown in FIG. 3, the pair of water communication paths
34, 35 are connected to the outer tub 2 via packings 81. The
packings for the water communication paths 34, 35 have the same
construction and, therefore, an explanation will be given only to
the packing for the water communication path 34.
[0062] The packing 81 is a cylindrical elastic component such as
composed of a rubber. The packing 81 is fitted around the water
communication path 34. The packing 81 is press-fitted in a
connection port 67 formed on an outer surface 66 (circumferential
wall) of the outer tub 2 externally of the outer tub 2. The packing
81 has a long sealing distance between the tubular water
communication path 34 and the connection port 67. The packing 81 is
fitted in a predetermined radially compressed manner to seal a gap
between the inner circumference of the connection port 67 and the
outer circumference of the water communication path 34. The packing
81 is elastically deformable in its radial and axial directions.
Thus, the packing 81 accommodates dimensional errors in the
connection port 67 and the water communication path 34. Further,
the packing 81 can accommodate a dimensional difference between a
pitch of the pair of water communication paths 34, 35 and a pitch
of the pair of connection ports 67. The packing 81 accommodates
thermal deformation of the outer tub 2 occurring when hot water is
retained in the outer tub 2. Thus, breakage and water leakage can
be prevented.
[0063] Besides the cylindrical packing, an O-ring and a sheet
packing may be employed as the packing 81.
[0064] The electrolyzing chamber 32 has a plurality of fixing
portions, e.g., four fixing portions 80, provided in the vicinity
of the pair of water communication paths 34, 35 for fixing the
electrolyzing chamber 32 to the outer tub 2 by screws. The screws
86 extending through through-holes of the fixing portions 80 are
externally screwed into bosses 68 projecting from the outer surface
66 of the outer tub 2.
[0065] Terminals 84 of the electrodes 33 extend outward through the
bottom face portion 76 of the electrolyzing chamber 32 as shown in
FIG. 4. Even if water drops adhere on the outer surface of the
electrolyzing chamber 32 due to water condensation and overflow of
the water from the washing tub, a short-circuit between the
terminals 84 of the pair of electrodes 33 is less liable to occur
due to the water drops. Thus, the terminals 84 can electrically be
isolated from each other. Further, a separation plate 87 is
provided for separating the terminals 84 of the pair of electrodes
33 from each other. The separation plate 87 prevents movement of
the water drops to ensure the electrical isolation. The separation
plate 87 may double as the fixing portion 80 formed integrally with
the electrolyzing chamber 32 for reduction of the number of the
components.
[0066] The water treatment unit 60 is assembled in the following
manner. With the separable bodies 78, 79 of the electrolyzing
chamber 32 being separated from each other, the electrodes 33 are
set in one 78 of the separable bodies. Then, the pair of separable
bodies 78, 79 are combined with each other, and seams thereof are
sealed. Thus, the assembling of the water treatment unit 60 is
completed. The water treatment unit 60 having the box-shaped
electrolyzing chamber 32 per se can be tested, for example, for the
sealing property and the electrolysis performance thereof, before
it is mounted on the outer tub 2. Then, the pair of water
communication paths 34, 35 are externally press-fitted in the
connection ports 67 of the outer tub 2 with the intervention of the
packings 81. The fixing portions 80 of the electrolyzing chamber 32
are respectively fixed to the bosses 68 of the outer tub 2 by
screws. The terminals 84 of the electrodes 33 are electrically
connected to the energization circuit 30. Further, the water
treatment unit 60 can be removed from the outer tub 2 by performing
the aforesaid operations in a reverse order. Thus, the maintenance
operation and the disassembling operation for the recycling can be
facilitated.
[0067] Since the water treatment unit 60 is thus provided on the
outside of the outer tub 2, the mounting operation for mounting the
water treatment unit 60 on the outer tub 2, the maintenance
operation for the water treatment unit 60 and the disassembling
operation for the recycling can easily be performed from the
outside of the outer tub 2. If the electrodes 33 were disposed
between the outer tub 2 and the washing/dehydration tub 5, there
would be a need for an additional space in the outer tub 2 and
additional water to be retained in the space. Where the water
treatment unit 60 is mounted on the outer surface of the outer tub
2, on the other hand, the need for the additional space and the
additional water is obviated.
[0068] It is herein merely necessary that the water treatment unit
60 which ensures easy implementation of the aforesaid operations is
provided as a unit separate from the outer tub 2 and unitarily
handled. For example, the water treatment unit 60 may include the
pair of electrodes 33 and the fixing portions 80 for fixing the
unit to the outer tub 2, and be adapted to electrolyze the water in
use for the washing process by its own or in cooperation with the
outer tub 2 to impart a cleaning capability to the water without
addition of the detergent.
[0069] The water treatment unit 60 is detachable from the outer tub
2, so that the detaching operation can highly conveniently be
performed. Where the electrodes 33 contain a precious metal, easy
recycling is advantageously ensured.
[0070] Since the water treatment unit 60 incorporates the
electrolyzing chamber 32 and the pair of electrodes 33, the water
treatment unit 60 can unitarily be handled for the mounting and
maintenance operations. Thus, these operations can further be
facilitated.
[0071] Since the electrodes 33 are supported at the opposite sides
thereof within the box-shaped electrolyzing chamber 32, the water
treatment unit 60 can be handled without careful attention.
Therefore, the assembling, maintenance and disassembling operations
can further be facilitated. In addition, there is no possibility
that the electrodes 33 are displaced or dislodged in the
electrolyzing chamber 32 due to the vibrations of the outer tub 2
during the dehydrating operation.
[0072] With the packings 81 provided between the water treatment
unit 60 and the outer tub 2, dimensional errors in the outer tub 2
and the corresponding portion of the water treatment unit 60 can be
accommodated by elastic deformation of the packings 81 when the
water treatment unit 60 is mounted on the outer tub 2, so that the
mounting can easily be achieved. In addition, the sealing of the
gap between the water treatment unit 60 and the outer tub 2 can be
achieved. Therefore, bonding for the sealing can be obviated, so
that labor for the assembling operation can be alleviated and the
detaching and disassembling operations can be facilitated.
[0073] By the provision of the pair of water communication paths
34, 35, the water inlet path and the water outlet path between the
electrolyzing chamber. 32 and the outer tub 2 can be separated,
whereby the water is caused to efficiently flow between the
electrolyzing chamber 32 and the outer tub 2. Thus, the treated
water can be supplied into the outer tub 2 for effective use in the
washing process without wastage, so that the cleaning capability
and the sterilizing capability can be enhanced. Further, the water
from the outer tub 2 is caused to flow within the electrolyzing
chamber 32 for efficient electrolysis.
[0074] The pair of water communication paths 34, 35 are spaced
apart from each other, so that the treated water is prevented from
flowing back into the electrolyzing chamber 32 immediately after
flowing out of the electrolyzing chamber 32.
[0075] The pair of water communication paths 34, 35 are provided at
different vertical positions of the thin-box-shaped electrolyzing
chamber 32 provided on the outer surface 66 of the outer tub 2, so
that the stagnation of the water and the trapping of air can be
suppressed. Thus, the water is caused to flow vertically (in a
direction indicated by an arrow in FIG. 3) for efficient
electrolysis.
[0076] Where the water flows upward in the electrolyzing chamber
32, the provision of the upper water communication path 34 at the
inclined upper portion 69 of the electrolyzing chamber 32 permits
the water flowing upward in the electrolyzing chamber 32 to be
guided along the inclination into the upper water communication
path 34 to speedily flow out, thereby facilitating the water flow.
The lower water communication path 35 provided at the lower end of
the electrolyzing chamber 32 prevents the stagnation of the water
in the electrolyzing chamber 32. This advantageously facilitates
the water flow in the electrolyzing chamber 32.
[0077] It is preferred that the electrodes 33 are thus provided in
a space where the water flows to ensure efficient electrolysis. It
is particularly preferred that the electrodes 33 are provided in a
space where the water is circulated with respect to the outer tub
2. Thus, the use efficiency of the electrolyzed water can be
enhanced. For example, it is conceivable that a circulation
mechanism is provided for forcibly circulating the water by sucking
the water from the outer tub 2 through an inlet thereof and
discharging the water through an outlet thereof, and the electrodes
33 are provided in the circulation mechanism. The circulation
mechanism may comprise a tubular water passage for water
communication between an upper portion and a lower portion of the
outer tub 2, and an electric pump for causing the water to pass
through the water passage. The construction of such a circulation
mechanism is disclosed in Japanese Patent Application No.
2000-196894 and the like filed by the applicant of the present
invention. Besides, a known construction for the water circulation
may be employed.
[0078] Since the electrolyzing chamber 32 has a thin box shape
having a smaller depth with respect to the outer surface of the
outer tub 2, the projection of the water treatment unit 60 from the
outer surface of the outer tub 2 can be reduced. Where the
electrolyzing chamber 32 is of a thin type fitted on the outer side
surface 66 as the outer surface of the outer tub 2, for example, an
increase in the size of the housing 1 is suppressed which may be
required for prevention of the bump of the water treatment unit 60
against the housing 1 during the dehydrating operation as described
above. Thus, space saving can be achieved. Where the electrolyzing
chamber 32 is of a thin type fitted on the bottom 64 as the outer
surface of the outer tub 2, the piping arrangement for the drainage
of used water from the electrolyzing chamber 32 can be simplified,
thereby achieving space saving.
[0079] Where the electrolyzing chamber 32 is provided below the
outer tub 2, e.g., below the bottom 64 and the outer side surface
66, water retained at a lower water level within the outer tub 2
can also be utilized. For example, the electrolyzing process can be
started in the midst of the water supply to the outer tub 2, so
that the time required for the electrolysis can be reduced.
Further, a course in which the electrolyzed water is utilized at a
lower water level can be realized.
[0080] Where the electrolyzing chamber 32 is provided on the outer
side surface 66 of the outer tub 2 and the water communication path
35 is provided at the lower end of the electrolyzing chamber 32,
the water in the electrolyzing chamber 32 is allowed to flow out
into the outer tub 2 through the water communication path 35 during
the water drainage from the outer tub 2.
[0081] It is also conceivable that at least a part of the
electrolyzing chamber 32 is formed integrally with the outer tub 2.
In this case, the electrolyzing chamber 32 is preferably provided
so as to project outward from the outer surface of the outer tub 2
or to be recessed along the inner surface of the outer tub 2. Thus,
the interior configuration of the outer tub 2 can generally
properly be maintained, thereby preventing reduction in space
efficiency within the outer tub 2 and increase in water consumption
more than necessary. Where the inner surface of the electrolyzing
chamber 32 and the inner surface of the outer tub 2 are continuous,
these inner surfaces are preferably inclined with respect to each
other to facilitate the water flow between the inside of the outer
tub 2 and the inside of the electrolyzing chamber 32.
[0082] In the meantime, the water from the outer tub 2 is often
contaminated with lint. If the lint adheres on the electrodes 33,
there is a fear that the durability of the electrodes 33 and the
electrolysis efficiency are reduced. Therefore, a problem
associated with the contamination of the water treatment unit 60
with the lint is solved in the following manner.
[0083] Corner portions 82 of the electrodes 33 each have an R-shape
83 (partly shown in FIG. 4). Thus, the electrodes 33 have no corner
edge, so that the lint is less liable to be caught on the corner
portions of the electrodes 33 and easily released. Even if the lint
is caught on the corner portions 82, the lint is naturally released
from the corner portion 82 by the water streams.
[0084] The R-shape 83 includes an R-shape as seen perpendicularly
to the plate surface of the electrode 33, and an R-shape as seen
along the plate surface of the electrode 33. At least some of the
corner portions maybe rounded, but it is preferred that more of the
corner portions, particularly, all the corner portions, are
rounded.
[0085] The spacing (D3) between the electrodes 33 is determined so
as to prevent the lint from being caught therebetween. The spacing
is preferably not smaller than 2 mm, for example. If the spacing is
smaller than 2 mm, the lint is liable to be caught. Further, a
spacing (D4) between the electrode 33 and the electrolyzing chamber
32 may be the same as the aforesaid spacing, or zero. That is,
there maybe no gap between the electrodes and the electrolyzing
chamber 32.
[0086] This prevents reduction in water fluidity due to adhesion of
the lint. This also prevents the lint from hindering the contact of
the water with the electrodes 33. As a result, the reduction in
electrolysis efficiency due to the lint can be prevented, so that
the electrolysis efficiency can be maintained at a higher level.
Since the lint is permitted to enter the water treatment unit 60,
there is no need for provision of a lint filter and maintenance
against the lint.
[0087] As shown in FIG. 2, the washing machine may have an air
bubble generator 88 for generating air bubbles from the bottom 64
of the outer tub 2 for enhancement of the cleaning capability.
Where the air bubble generator 88 and the water treatment unit 60
are used in combination, the electrolysis can be achieved more
efficiently.
[0088] The air bubble generator 88 includes an air pump 89, an air
hose 90 connected to an air outlet of the air pump 89 for air
supply, and a nozzle (not shown) connected to an end of the air
hose 90 for ejecting air into the outer tub 2. When the air bubble
generator 88 is actuated in the washing process, the air is ejected
from the nozzle, and flows into the washing/dehydration tub 5
through the perforations of the washing/dehydration tub 5 to
generate air bubbles below the pulsator 7. The air bubbles are
agitated by the rotating pulsator 7, and broken into a multiplicity
of minute air bubbles. When the minute air bubbles are brought into
contact with the laundry, the minute air bubbles are broken to
generate ultrasonic waves. At this time, shock waves within an
ultrasonic range are generated, thereby promoting removal of dirt
components adhering onto the laundry. Thus, the cleaning capability
can be enhanced as compared with a case where air bubbles are not
applied.
[0089] The air bubble generator 88 has a function as air supplying
means for supplying air into the electrolyzing chamber 32 from a
lower portion 70 of the electrolyzing chamber 32 in addition to the
originally intended function for enhancing the cleaning capability.
The air supplying means generates water streams by promoting upward
water flow within the electrolyzing chamber 32 of the water
treatment unit 60. The air hose 90 is branched in a middle portion
thereof. One branch extends to the nozzle, and the other branch is
connected to the electrolyzing chamber 32.
[0090] A single air supply port 91 is provided in the lower portion
70 of the electrolyzing chamber 32 so as to be supplied with the
air from the air hose 90 as shown in FIG. 4. A plurality of air
supply ports 91 may be provided. The air pump 89 is actuated in the
electrolyzing process. The air supplied into the electrolyzing
chamber 32 from the air supply port 91 is broken into air bubbles
E, which float in the electrolyzing chamber 32 to flow into the
outer tub 2 through the upper water communication path 34 (in a
direction indicated by a one-dot-and-dash line in FIG. 4).
Correspondingly, the water retained in the electrolyzing chamber 32
is caused to flow by the flow of the air (in a direction indicated
by a broken line in FIG. 4). Particularly, where the upper portion
69 of the electrolyzing chamber 32 is inclined and the water
communication path 34 is located at the higher position, the air
bubbles can quickly flow out of the electrolyzing chamber 32, so
that the water flow can further be facilitated. There is no
possibility that the air bubbles are trapped between the electrodes
33. As a result, the electrolysis efficiency can be enhanced.
Therefore, a voltage required to provide a predetermined
electrolyzing capability can be reduced, thereby realizing
reduction in size, cost and power consumption of the electrical
components such as the transformer 61.
[0091] The air supply port 91 is disposed so as not to overlap with
the electrodes 33 as seen in plan and so as not to face toward the
electrodes 33. Thus, the air can be supplied without contact with
the electrodes 33. Therefore, reduction in electrolysis efficiency
due to the air can be suppressed. It is preferred that the air
supply port 91 is horizontally spaced a predetermined distance from
edges of the electrodes 33 in a corner of the bottom face portion
76 of the electrolyzing chamber 32. The predetermined distance is a
distance such as not to permit the contact of the air with the
electrodes 33, for example, 10 mm.
[0092] The air supply port 91 and the upper water communication
path 34 are disposed at diagonally opposite positions as seen from
the front side. Thus, the air can flow a longer distance in the
electrolyzing chamber 32, so that the water flow can be
facilitated. The air supply port 91 and the lower water
communication path 35 are disposed at laterally separate positions
as seen from the front side. Thus, water present in a position
remote from the lower water communication path 35 is caused to
easily flow, which may otherwise have a difficulty in flowing.
[0093] Thus, the water flow in the electrolyzing chamber 32 can be
facilitated for efficient electrolysis. In addition, the air is
introduced into the outer tub 2 for improvement of the cleaning
capability. The aforesaid air pump 89 may be adapted to supply the
air only to the electrolyzing chamber 32. Referring back to FIG. 1,
the following explanation is directed to a case where the air
bubble generator 88 is not provided.
[0094] A top plate 18 is provided on a top face of the housing 1.
The top plate 18 has a laundry loading port 18a provided in a
center portion thereof. The loading port 18a is covered with an
openable upper lid 19. An operation panel 48 is provided in front
of the top plate 18.
[0095] FIG. 5 is a plan view of the operation panel 48. The
operation panel 48 includes an operation section 21 and a display
section 28. The operation section 21 has a power supply key 49 for
turning on power supply to the machine, a start key 36 for starting
a washing process, and a set of course keys 37 as selecting means
for selecting a washing course. The course key set 37 includes a
standard course key 38 for selecting a standard course, a
self-arranged course key 39 for selecting a self-arranged course, a
fast course key 40 for selecting a fast course, a thorough rinsing
course key 41 for selecting a thorough rinsing course, and a zero
detergent course key 42 for selecting a zero detergent course.
[0096] The standard course is a washing course in which a standard
washing process is performed. The self-arranged course is a washing
course in which a washing process is performed according to a
procedure set by a user (manually set procedure). The fast course
is a washing course in which a washing process time is short. The
thorough rinsing course is a washing course in which a rinsing
operation is thoroughly performed by increasing a rinsing operation
period and the number of times of the rinsing operation. These
courses employ a detergent. In these courses, water containing the
detergent (detergent solution) is retained in the outer tub 2 and
the laundry is washed by generating water streams by the rotation
of the pulsator 7. These courses are collectively referred to as a
first washing course.
[0097] The zero detergent course employs no detergent. In this
course, water retained in the outer tub 2 is electrolyzed by the
electrolyzing device 31 for production of electrolyzed water, and
the laundry is washed by generating water streams by the rotation
of the pulsator 7. The zero detergent course is referred to as a
second washing course.
[0098] The display section 28 includes a course display section 43
for displaying a selected washing course, a detergent amount
display section 44 as information means for displaying the amount
of the detergent corresponding to the load of the laundry, and a
zero detergent display section 45 as second information means for
indicating addition of no detergent by lighting an LED. In the
course display section 43, LEDs 46 are provided in the vicinity of
the respective course keys, and one of the LEDs corresponding to
the selected washing course is lighted. In the detergent amount
display section 44, a plurality of LEDs 47 are provided in an
illustration of a detergent measure cup, and a number of LEDs 47
corresponding to the amount of the detergent are lighted for
indication of the detergent amount.
[0099] FIG. 6 is a diagram illustrating the electrical construction
of the fully automatic washing machine according to this
embodiment. A control center is a control section 20 including a
CPU, a RAM, a ROM, a timer and the like. The control section 20 is
comprised of a microprocessor. An operation signal is inputted to
the control section 20 from the operation section 21. A water level
detection signal is inputted to the control section from a water
level sensor 22 as water level detecting means for detecting the
level of the water contained in the outer tub 2. The control
section 20 is connected to a switch 57 as open/close detecting
means for detecting the opening and closing of the upper lid 19.
When the upper lid 19 is open, the control section 20 detects this
state on the basis of the ON/OFF of an internal circuit of the
switch 57. The control section 20 controls the rotation of the
motor 8 via the invertor driving section 23, and controls the
operation of the torque motor 26 and the operation of the water
supply valve 13 via a load driving section 25. The torque motor 26
controls the operation of the clutch 27 and the operation of the
water drainage valve 15 as described above. Further, the control
section 20 controls the operation of the display section 28 and the
operation of a buzzer 29 for notifying the end of the process and
an abnormality in the process. The motor 8 is provided with a
rotation sensor 24 for outputting pulse signals according to the
rotation thereof, and the pulse signals are inputted to the control
section 20. The rotation sensor 24 is provided for detecting the
rotation speed of the motor 8, i.e., the rotation speed of the
washing/dehydration tub.
[0100] The pair of electrodes 33 are connected to an output side of
the control section 20 via the energization circuit 30 including
the transformer 61 and the like. When an energization signal is
outputted from the control section 20, the energization circuit 30
is actuated for energization of the pair of electrodes 33.
[0101] Sequences for the respective washing courses are stored in
the ROM 20a of the control section 20.
[0102] When a washing course is selected by the operation of the
course key set 37, a sequence for the selected washing course is
read out of the ROM 20a. Then, the control section 20 controls
loads to be applied to the motor 8 and the like according to the
sequence, and performs the washing process according to the
selected washing course.
[0103] An explanation will be given to the operation of the fully
automatic washing machine having the aforesaid construction
according to this embodiment. With reference to a flow chart in
FIG. 7, there will first be described a case where a user selects
the standard course which is a typical washing course employing a
detergent.
[0104] When the start key 36 is pressed to provide a command for
the start of the washing process, the load or the amount of laundry
loaded in the washing/dehydration tub 5 is detected prior to the
supply of water (Step S1) More specifically, the pulsator 7 is
rotated for a short period of time, and the load is determined on
the basis of a period during which the consequent inertial rotation
continues. In this case, load detection means is constituted by the
pulsator 7 and the control section 20. Of course, the detection of
the load is not limited to this method, but any other method may be
employed.
[0105] Next, a washing water level is determined according to the
detected load (Step S2), and a detergent amount corresponding to
the load is displayed on the detergent amount display section 44
(Step S3). In view of the display in the detergent amount display
section 44, a user adds a proper amount of a detergent into the
washing/dehydration tub 5.
[0106] In turn, the supply of tap water is started, and the water
is supplied to the determined washing water level (Steps S4 to S6).
Thus, a detergent solution obtained by dissolving the detergent in
the tap water is contained in the outer tub 2.
[0107] Subsequently, the pulsator 7 is rotated at a predetermined
speed in one direction or in opposite directions, whereby water
streams are generated in the outer tub 2 for washing the laundry
(Step S7). Dirt adhering to the laundry is removed by the effects
of the detergent and the water streams. After a lapse of a
predetermined washing period, the pulsator 7 is stopped to end the
washing operation (Steps S8, S9).
[0108] After the washing operation is completed, a first
intermediate dehydrating operation, a first rinsing operation, a
second intermediate dehydrating operation, a second rinsing
operation and a final dehydrating operation are sequentially
performed. Thus, the washing process is completed.
[0109] With reference to a flow chart in FIG. 8, an explanation
will be given to a case where the user selects the zero detergent
course which employs no detergent.
[0110] When the start key 36 is pressed to provide a command for
the start of the washing process, the LED of the zero detergent
display section 45 is lighted instead of the display in the
detergent amount display section 44 (Step S11). Thus, the user is
notified that no detergent is added.
[0111] Then, the supply of tap water is started (Step S12). The
water is supplied to a predetermined washing water level (more
specifically a lower water level) for the zero detergent course.
When the water in the outer tub 2 reaches a predetermined level
which is lower than the washing water level and permits the pair of
electrodes 33 of the electrolyzing device 31 to be submerged in the
water, the electrolyzing device 31 is actuated, i.e., the pair of
electrodes are energized (Steps S13, S14). Further, the pulsator 7
is rotated at a predetermined speed in one direction or in opposite
directions to generate water streams in the outer tub 2 (Step
S15).
[0112] The tap water contains very small amounts of impurities such
as iron, calcium, magnesium and chlorine. Therefore, electrolyzed
water is produced through the electrolyzing process performed in
the electrolyzing chamber 32, and the tap water goes back and forth
between the electrolyzing chamber 32 and the outer tub 2, whereby
the outer tub 2 is gradually filled with the electrolyzed water.
The electrolyzed water has a weak alkalinity. Further, active
oxygen as well as hypochlorous acid (HClO) and hypochlorous ions
(ClO-) are generated in the electrolyzed water in the electrolyzing
chamber 32. Together with the electrolyzed water, hypochlorous acid
and hypochlorous ions flow into the outer tub 2. In the outer tub
2, dirt adhering to the laundry is removed by the effect of the
alkaline water and the effect of the water streams. Further, the
laundry is sterilized by the effect of hypochlorous acid and
hypochlorous ions. The dirt removed from the laundry is decomposed
by the effect of the active oxygen in the electrolyzing chamber 32,
and prevented from adhering again to the laundry.
[0113] When the amount of water reaches the washing water level,
the water supply is stopped (Steps S16, S17). On the other hand,
the operation of the electrolyzing device 31 and the operation of
the pulsator 7 are continued. After a lapse of a predetermined
washing period, the operation of the electrolyzing device 31 (the
energization of the pair of electrodes 33) is stopped, and the
pulsator 7 is stopped for completion of the first washing operation
(Steps S18 to S20).
[0114] A process sequence from Step S13 to Step S20 will be
explained with reference to a timing chart in FIG. 9.
[0115] After the water supply is started (at a time point t1), the
water level in the outer tub 2 reaches a predetermined
electrolyzing water level H1. The electrolyzing water level is
specified as a water level at which the electrolyzing process can
be started, for example, as a water level at which at least parts
of the pair of electrodes, more preferably virtually the entire
electrodes 33, are submerged in the water. The electrolyzing water
level is lower than the washing water level H2 required for the
washing or rinsing operation. Then, the water level sensor 22
senses that the water contained in the outer tub 2 reaches the
predetermined water level (at a time point t2). In response to an
output signal for the electrolyzing water level H1 from the water
level sensor 22, the control section 20 starts the energization of
the pair of electrodes 33. Where the air pump 89 is provided, the
air pump 89 is actuated in association with the energization of the
electrodes 33 to supply air into the electrolyzing chamber 32.
Thus, water streams are generated in the electrolyzing chamber 32
for effective electrolysis. While the electrolyzing process is
performed, the motor 8 is driven back and forth to rotate the
pulsator 7 in opposite directions. During this period, the water
supply is continued. When the water level in the outer tub 2
reaches the washing water level H2, this is detected by the water
level sensor 22 (at a time point t3), and the water supply valve 13
is closed. Thereafter, the driving of the motor 8 and the air pump
89 is stopped, and the energization of the electrodes 33 is stopped
(at a time point t4). After the water supply valve 13 is closed,
the water level in the outer tub 2 is slightly reduced. The water
is correspondingly supplied again so that the water level returns
to the washing water level H2 (from a time point t5 to a time point
t6). Then, the washing operation is performed for a predetermined
period. During this period, the driving of the motor 8 and the air
pump 89 and the energization of the electrodes 33 are effected
(from a time point t6 to a time point t7). Although the
electrolyzing process is once interrupted when the washing water
level H2 is satisfied, the electrolyzing process may continuously
be performed without the interruption.
[0116] By thus starting the energization for the electrolysis at
the time point when the water is supplied to the electrolyzing
water level which is lower than the washing water level, the
electrolyzing process can be started at earlier timing and
continued for a longer period of time than in a case where the
energization is started when the washing water level is satisfied.
As a result, water electrolyzed to a high degree or so-called
"densely electrolyzed" water can be obtained. For example, the
electrolyzed water has an increased alkalinity and higher
concentrations of hypochlorous acid and hypochlorous ions. As a
result, the cleaning capability can be enhanced.
[0117] By supplying the air from the air pump 89 in association
with the energization for the electrolysis, the air promotes the
water flow in the electrolyzing chamber 32 for efficient
electrolysis of the water. Thus, densely electrolyzed water can be
obtained.
[0118] After an intermediate dehydrating operation is performed, a
second washing operation is performed in the same manner as the
first washing operation. Upon completion of the second washing
operation, a final dehydrating operation is performed. Thus, the
washing process in the zero detergent course is completed.
[0119] In the case of water electrolyzed to a predetermined degree
within a commonly available range through the electrolyzing
process, the cleaning capability of the electrolyzed water
increases as the concentration of the electrolyzed water increases.
Therefore, more densely electrolyzed water is preferred. When the
densely electrolyzed water is to be obtained, there is a fear for
overcurrent in the electrolyzing process. That is, the conduction
of the electric current varies depending on the electrical
conductivity of the water, so that the energization electric
current for the electrolysis may vary with the application of a
substantially constant voltage. Therefore, electrically more
conductive water tends to suffer from the overcurrent, if the
energization electric current is set at a higher level for standard
water to provide densely electrolyzed water. If the energization
electric current is set at a lower level for the electrically more
conductive water for prevention of the overcurrent, electrically
less conductive water tends to be electrolyzed to a lower degree,
so that the cleaning capability may be reduced depending on the
electrical conductivity of the water.
[0120] To this end, the washing machine according to the present
invention includes energization controlling means constituted by
the control section 20, the energization circuit 30 and an electric
current detection circuit 51 for controlling the energization of
the water treatment unit 60 for the electrolysis as shown in FIG.
6. The electric current detection circuit 51 is connected to the
energization circuit 30, and adapted to detect the magnitude of the
energization electric current for the energization of the
electrodes 33 to output the detected magnitude to the control
section 20. According to the output or the sequence, the control
section 20 and the energization circuit 30 cooperate with each
other to start and stop the energization of the water treatment
unit 60. Further, the control section can reverse the direction of
the flow of the energization electric current applied to the pair
of electrodes 33. For intermittent energization, the control
section variably sets the ratio between an energization period and
a non-energization period. Thus, an average magnitude of the
energization electric current during a predetermined period, for
example, during a period longer than an intermittent energization
cycle (hereinafter referred to as "average electric current", which
may also be cited in the case of the continuous energization, in
which the average electric current is equal to the magnitude of the
electric current) is varied, while the voltage is kept at a
constant level. As a result, the power can virtually be adjusted
variably.
[0121] With reference to a flow chart in FIG. 10, an explanation
will be given to a control operation. The following explanation is
directed to a case where the washing operation is performed once.
Where the washing operation is performed a plurality of times, the
control operation is performed for each washing operation. Further,
the control operation is performed in the same manner for the
rinsing operation.
[0122] The washing operation is started and, where the
electrolyzing process is to be implemented (YES in Step S21), an
implementation flag indicative of the implementation of the
electrolyzing process is turned on (Step S22). Then, the polarities
of the pair of electrodes 33 (or an electric current flow
direction) is read out of an EEPROM 56 of the control section
20.
[0123] An electric current flow direction lastly employed for the
preceding electrolyzing process is stored in the EEPROM 56. Where
this washing operation is the first washing operation performed
after the power on, for example, an electric current flow direction
employed for the last rinsing operation in the preceding washing
process is stored in the EEPROM 56. Where this washing operation is
the second washing operation in this washing process, an electric
current flow direction employed for the first washing operation in
this washing process is stored.
[0124] The electric current flow direction to be employed for the
energization of the pair of electrodes 33 in this washing operation
is determined so as to be opposite to the electric current flow
direction for the energization of the pair of electrodes 33 thus
read out, and the pair of electrodes 33 are energized (Steps S25 to
S27). The washing operation is performed (Step S29) for a
predetermined period of time (NO in Step S30). During this period,
the magnitude of the energization electric current is detected
(Step S22A), and the electric current controlling operation is
performed for adjustment of the average electric current according
to the magnitude of the detected electric current (Step S29A).
Further, an over current detecting operation is performed (Step
S23). It is judged whether the upper lid 19 is open or not (Step
S23A), and a continuous energization period judging operation is
performed (Step S24).
[0125] That is, if the magnitude of the detected energization
electric current is greater than a predetermined electric current
level (NO in Step S23) the energization of the electrodes 33 is
interrupted (turned off) (Step S28). After a lapse of a
predetermined period, the energization is resumed. When the time
elapsed from the start of the energization in the electrolyzing
process in this washing operation reaches a continuous energization
period (YES in Step S24), the energization is stopped (Step S28).
Thereafter, the energization is kept off until the end of the
washing operation. If it is judged that the upper lid 19 is open
(YES in Step S23A), the energization of the electrodes 33 is
interrupted to give a feeling of safety to the user (Step S28). If
it is judged that the upper lid 19 is closed (NO in Step S23A), the
energization of the electrodes 33 is effected.
[0126] Upon completion of the washing operation (YES in Step S30),
the polarities of the electrodes 33 employed in this washing
operation is stored in the EEPROM 56 as the storage means (YES in
Step S31, and Step S32). The EEPROM 56 is incorporated in the
control section 20. Data stored in the EEPROM is rewritable and,
even if the power key of the machine is turned off, the data is
kept retained.
[0127] Where the electrolyzing process is not performed (NO in Step
S21), the electrodes 33 are not energized (Step S28) and, after the
washing operation (Step S29, and YES in Step S30), the stored
polarities are kept retained without alteration (NO in Step
S31).
[0128] The energization circuit 30 and the electric current
detection circuit 51 are integrally constructed as shown in FIG.
11. That is, there are provided a relay 52 operated by the control
section 20 as a switch for switching the electric current flow
direction for the energization of the pair of electrodes 33, a
drive transistor 53 for starting and stopping the energization of
the electrodes 33, a protective transistor 54 for protecting the
drive transistor 53, and a resistor 55 constituting a shunt for
detecting the magnitude of the energization electric current
applied to the pair of electrodes 33. A voltage V2 applied to one
end of the resistor 55 is monitored for the detection of the
energization electric current. According to the magnitude of the
detected energization electric current, the control section 20
controls the starting and stopping of the energization of the
electrodes 33. The protective transistor 54 is provided as a
protective circuit so that the energization can be interrupted
independently of the control section 20. A collector-emitter
voltage of the drive transistor 53 (voltage between V1 and V2) is
monitored and, if the monitored voltage exceeds a predetermined
level, the protective transistor 54 is actuated for interruption of
the energization through the transistor 53.
[0129] The magnitude of the energization electric current applied
to the electrodes 33 is detected in the aforesaid manner during the
electrolyzing process and, when the magnitude of the detected
energization electric current is at a normal level, a normal
electric current controlling operation (Step S29A) is performed.
When the magnitude of the detected energization electric current is
excessively great, an overcurrent controlling operation is
performed (NO in Step S23, and Step S28).
[0130] The overcurrent controlling operation and the normal
electric current controlling operation are performed so as to cope
with a difference in the electric current conduction due to the
concentration of impurities such as calcium in the water during the
electrolysis. When the electric current conduction in the
electrolyzing chamber 32 is higher, the electric current conduction
in the energization circuit 30 is relatively reduced for the
electric current supply. When the electric current conduction in
the electrolyzing chamber 32 is lower, the electric current
conduction in the energization circuit 30 is relatively increased
for the electric current supply. Thus, the average electric current
can be kept at a constant level, e.g., at 1A, whereby the power
required for the electrolyzing process (power required for
electrolyzing a unit amount of water) can be kept at a generally
constant level. As a result, water electrolyzed to a generally
constant degree can be obtained. Besides the control of the average
electric current at the constant level, the energization is
interrupted or stopped if it is difficult to control the average
electric current. Thus, the overcurrent can be prevented. Since the
average electric current can be reduced to not higher than the
predetermined level, a temperature increase of circuit elements
such as the transistor 53 can be suppressed during the
energization.
[0131] In the overcurrent controlling operation, the overcurrent is
detected. That is, if the magnitude of the energization electric
current detected by the electric current detection circuit 51 is
greater than a predetermined electric current level, the
energization of the electrodes 33 is once interrupted (turned off)
for a predetermined period, and then resumed. Where the
energization electric current exceeds 2A and the collector-emitter
voltage of the transistor 53 exceeds 1V, for example, the
energization is interrupted for 5 seconds immediately after the
detection of the overcurrent. After a lapse of 5 seconds, the
energization is resumed. After the resumption of the energization,
the detection of the electric current is continued in the same
manner. Where the result of the detection indicates that the
overcurrent state still continues, the resumption of the
energization may be effected only several times, e.g., six times.
The energization may be resumed under different conditions. For
example, the same electric current flow direction is employed for
the energization until the third resumption of the energization,
and the opposite electric current flow direction is thereafter
employed. Where the overcurrent is detected even after the final
resumption of the energization, the energization is stopped. Even
if the energization is stopped after the detection of the
overcurrent, the energization is permitted in the subsequent
washing operation and rinsing operation. It is also conceivable
that the energization is not resumed but kept stopped after the
detection of the overcurrent. Where the energization is resumed
under different conditions, the electric current flow direction as
well as the energization period, the voltage and the electric
current may variably set. It is also conceivable that the
energization conditions are not changed at the resumption of the
energization.
[0132] In the normal electric current controlling operation (Step
S29A), the conditions for the energization of the electrodes 33 are
varied according to the magnitude of the energization electric
current detected by the electric current detection circuit 51. For
example, a continuous energization operation and an intermittent
energization operation are selectively performed. In the
intermittent energization operation, the energization period (or
ON-period during which the electric current actually flows) and the
non-energization period (OFF-period) may be predefined as constant
periods. Alternatively, the ratio between the non-energization
period and the energization period may variably be set depending on
the magnitude of the detected energization electric current, e.g.,
depending on the maximum electric current level. Otherwise, the
voltage may variably be set, or the magnitude of the energization
electric current may variably be set. In addition, the electric
current flow direction may be changed. Where the detected
energization electric current exceeds 2A and the collector-emitter
voltage of the transistor 53 is not higher than 1V, for example,
the intermittent energization operation is performed with an
energization period of 0.5 seconds and a non-energization period of
4 seconds after the detection. Where the detected energization
electric current is greater than 1A and not greater than 1.5A, the
intermittent energization operation is performed with an
energization period of 2 seconds and a non-energization period of 1
second after the detection. Where the detected energization
electric current is greater than 1.5A and not greater than 2A, the
intermittent energization operation is performed with an
energization period of 1 second and a non-energization period of 1
second after the detection. Where the detected energization
electric current is not greater than 1A, the continuous
energization operation is performed in this state. The energization
circuit 30 and the electric current detection circuit 51 may have
any other known construction than the aforesaid construction.
[0133] The detection of the magnitude of the energization electric
current (Step S22A) is synchronized with the energization when the
intermittent energization operation is performed.
[0134] By variably setting the energization conditions according to
the magnitude of the energization electric current applied to the
electrodes 33 in the normal electric current controlling operation,
the control section 20 suppresses the overcurrent in the
electrolyzing process, and adjusts the energization electric
current, i.e., the power per unit amount of water, in the
electrolyzing process when the washing operation is performed with
the use of a reduced amount of the detergent. For example, the
energization electric current can be adjusted to maximize the
cleaning effect. Therefore, the densely electrolyzed water can
advantageously be obtained. Further, the cleaning capability can be
maintained at a higher level irrespective of the conductivity of
the water.
[0135] The control section 20 interrupts the energization when the
overcurrent to the electrodes 33 is detected. Even if the
energization electric current is set at a higher level for water
having a standard electric current conduction, for example, the
overcurrent can be suppressed during the electrolysis of
electrically more conductive water. Where the energization is
resumed after the interruption, the electrolyzing process can be
continued. Thus, the densely electrolyzed water can advantageously
be obtained.
[0136] The power, particularly, the average electric current can be
maintained generally constant through the electric current
controlling operation including the intermittent energization
operation. Therefore, the construction of the energization circuit
30 can be simplified.
[0137] By reversing the flow direction of the electric current
applied to the water treatment unit 60 for each of the
predetermined unit operations, e.g., the washing operation and the
rinsing operation, in the washing process, the polarities of the
electrodes 33 are alternated, so that one of the electrodes 33 is
prevented from being kept at one polarity. As a result, excessive
wear of one of the electrodes 33 can be suppressed which may occur
due to the non-alternation of the polarities.
[0138] Since the electric current flow direction is reversed for
each unit operation in the washing process, the electrolyzing
process can continuously be performed with higher efficiency
without the reversal of the electric current flow direction during
the electrolyzing process. Therefore, the densely electrolyzed
water can advantageously be obtained.
[0139] Further, the flow direction of the electric current applied
to the electrodes 33 is stored after each of the predetermined
operations, e.g., the washing operation and the rinsing operation,
in the washing process, and reversed on the basis of the previous
electric current flow direction. Thus, the electric current flow
direction employed for the preceding operation can assuredly be
switched to an electric current flow direction to be employed for
the subsequent operation Therefore, the wear of one of the
electrodes 33 can be suppressed irrespective of the operations
performed in the washing process. Even if the washing operation is
repeated many times in the washing process, for example, there is
no possibility that one of the electrodes 33 is kept at one
polarity.
[0140] It is more preferred that the storage means is adapted to
retain stored data therein irrespective of the ON/OFF of the power
switch. Even where the electrolyzing process is performed three
times in every washing process, for example, the non-alternation of
the polarities of the electrodes can be prevented.
[0141] In contrast to the arrangement described above, it is also
conceivable that the next electric current flow direction is stored
in the storage means and the subsequent energization is effected on
the basis of the data thus stored. It is also conceivable that the
storage in the storage means is effected at any other timing in the
washing process, rather than after the end of an operation in the
washing process.
[0142] By reducing the energization period in each unit operation
of the washing process to shorter than the maximum energization
period, the wear of the electrodes 33 can advantageously be
suppressed. This is because, if the energization is continued for a
long period of time with one of the electrodes 33 kept at one
polarity, the electrodes are more susceptible to wear. The maximum
energization period is set at 15 minutes, for example. In the case
of the intermittent energization, the maximum energization period
may be defined as a period elapsed from the start of the first
energization to the end of the last energization in the washing
process, or the sum of the energization periods in which the
energization is actually effected in the intermittent energization
in the washing process.
[0143] Examples of the aforesaid unit operation in the washing
process include the washing operation and the rinsing operation. It
is also conceivable that the washing process includes a plurality
of unit operations, for example, the washing process in the
aforesaid zero detergent course.
[0144] In the meantime, the control section 20 as the washing
controlling means may perform different control operations on the
water treatment unit 60 for the respective courses or,
alternatively, perform different control operations on components
other than the water treatment unit 60 for the respective
courses.
[0145] For example, an intermediate dehydrating operation may be
performed after the washing operation and the rinsing operation in
a washing process. The washing process to be performed in this case
will be described with reference to a flow chart in FIG. 12. In
this washing process, the following operations are sequentially
performed. That is, the washing process includes water supply (Step
S41), washing (Step S42), water drainage (Step S43), first
intermediate dehydration (Step S44), water supply (step S45), first
rinsing (Step S46), water drainage (Step S47), second intermediate
dehydration (Step S48), water supply (Step S49), final rinsing
(Step S50), water drainage (Step S51) and dehydration (Step S52).
In the first course, a detergent solution is used in the washing
operation in Step S42. In the second course, the electrolyzed water
is used in the washing operation in Step S42.
[0146] The control section 20 functions as intermediate dehydration
period reducing means and water drainage period reducing means
according to the present invention for reducing the periods of the
first intermediate dehydrating operation, the second intermediate
dehydrating operation and the water draining operations (Steps S43,
S47) in the second course utilizing the electrolyzing process
performed by the water treatment unit 60 as compared with those in
the first course employing the detergent.
[0147] The period of the first intermediate dehydrating operation
in Step S44 is 6 minutes in the first course, and 3 minutes and 30
seconds in the second course. The period of the second intermediate
dehydrating operation in Step S48 is 3 minutes in the first course,
and 2 minutes in the second course. The periods of the water
draining operations in Steps S43, S47 during which the water
drainage valve is open are each 1 minute and 40 seconds in the
first course, and 1 minute and 10 seconds in the second course.
Thus, the periods of the respective operations are set shorter in
the second course than in the first course.
[0148] By thus reducing the intermediate dehydration periods in the
second course, the time required for the washing process in the
second course can be reduced. Since the second course employs a
smaller amount of the detergent, bubbles can be suppressed which
may be generated by the agitation of water in the intermediate
dehydrating operations after the washing operation and the rinsing
operation. As a result, the dehydration can sufficiently be
achieved in a shorter period of time. Since the resistance due to
the bubbles can be reduced, the rotation speed of the
washing/dehydration tub 5 can rapidly be increased for enhancement
of the dehydration effect.
[0149] By reducing the water drainage periods in the second course,
the time required for the washing process in the second course can
be reduced. Since the generation of the bubbles can be suppressed
in the second course employing a smaller amount of the detergent as
compared with the first course employing a greater amount of the
detergent, the water drainage can be achieved in a shorter period
of time.
[0150] In the washing course employing the detergent, e.g., in the
standard course, the electrolyzing device 31 may be operated in the
rinsing operations (first and second rinsing operations), so that
the electrolyzed water is employed for rinsing the laundry. Thus,
the laundry can be sterilized while being rinsed.
[0151] It is also conceivable that the electrolyzing device 31 is
operated in the washing operation in the washing course employing
the detergent, e.g., in the standard course. However, there is a
high possibility that the water containing the detergent is not
properly electrolyzed, resulting in the overcurrent. Therefore, the
energization of the electrodes 33 is, in principle, stopped in the
washing operation employing the detergent solution to assuredly
prevent the overcurrent in the aforesaid embodiment. Where the
electrolyzing process is performed in the washing operation
employing the detergent as described above, on the other hand, the
energization period or the energization electric current is
preferably reduced. Thus, the overcurrent is suppressed and, at the
same time, a cleaning capability improving effect and a sterilizing
effect of the electrolyzed water can be provided in addition to the
cleaning effect of the detergent, thereby further enhancing the
cleaning capability. The concentration of the detergent is lower in
the rinsing operation than in the washing operation. Even if the
detergent is used in the washing operation, the electrolysis of the
water in the subsequent rinsing operation poses no problem, so that
the sterilizing effect of the electrolyzed water can be
provided.
[0152] The washing machine may have a dry-cleaning course in which
a dry-cleaning detergent is employed for the washing operation. It
is preferred that the water treatment unit 60 is not energized in
the dry-cleaning course of the washing machine. Thus, shrinkage of
the clothes by the electrolyzed water can be prevented. That is,
the clothes to be dry-cleaned with the use of the dry-cleaning
detergent are liable to shrink due to the alkaline electrolyzed
water. However, the suppression of the shrinkage of the clothes and
the sterilizing effect can be ensured by reducing the period of the
energization of the water treatment unit 60 or the energization
electric current.
[0153] An automatic detergent adding device may be provided as
adding means for automatically adding a proper amount of the
detergent according to the detected load. Thus, the detergent is
automatically added in the washing course employing the detergent,
e.g., in the standard course, and no detergent is added in the zero
detergent course. A conventionally known device may be used as the
automatic detergent adding device and, therefore, no explanation
will be given to the construction thereof.
[0154] Some of washing machines of the type adapted for the
automatic addition of the detergent are designed to perform a
preliminary washing operation and, after the water drainage,
perform a main washing operation. In such a preliminary washing
operation, the electrolyzed water according to the present
invention may be employed.
[0155] An explanation will be given to such a washing machine with
reference to a timing chart in FIG. 13. Components of the washing
machine having the same constructions as those of the washing
machine previously described are denoted by the same reference
characters, and no explanation will be given thereto. Components
having different constructions will mainly be explained. When the
washing process is started, water supply is started (at a time
point t11). In this water supply, water is supplied into the outer
tub 2 through a first supply valve without supplying the detergent
from the automatic detergent adding device. When the water reaches
a predetermined water level (electrolyzing water level) in the
outer tub 2 (at a time point t12), the preliminary washing
operation is started. That is, the energization of the water
treatment unit 60 is started for the electrolyzing process, and the
motor 8 is driven to rotate the pulsator 7 as preliminary washing
water stream generating means in opposite directions. When the
water reaches a water level predetermined for the preliminary
washing operation, the water supply is stopped (at a time point
t13). The preliminary washing operation is performed for a
predetermined period. Upon completion of the preliminary washing
operation (at a time point t14), the driving of the motor 8 is
stopped, and the energization of the water treatment unit 60 is
stopped to stop the electrolyzing process. The water drainage valve
15 is opened to once drain the water out of the outer tub 2. Then,
an intermediate dehydrating operation is performed (from a time
point t15 to a time point t16).
[0156] Subsequently, the main washing operation is performed.
First, a second water supply valve is opened (at a time point t16)
Thus, the water is supplied into the outer tub 2, while the
detergent is supplied therein from the automatic detergent adding
device. When the water reaches the electrolyzing water level (at a
time point t17), the main washing operation is started. At this
time, the motor 8 is driven to perform the washing operation with
the use of the detergent without performing the electrolyzing
process. Then, the water is supplied to the washing water level,
and the washing operation is performed for a predetermined period
(from a time point t17 to a time point t19).
[0157] Besides the washing operation employing the detergent, the
washing operation employing the electrolyzed water may be performed
as the main washing operation.
[0158] By thus employing the electrolyzed water for the preliminary
washing operation, the cleaning capability in the preliminary
washing operation can be enhanced as compared with the preliminary
washing operation employing ordinary water. Thus, the cleaning
capability in the main washing operation can be enhanced.
[0159] While the embodiment of the present invention has thus been
described, it should be understood that the invention be not
limited to the embodiment as will be described below.
[0160] The electrolyzing device 31 may be a device attached to the
washing tub 2, e.g., a unit such as the water treatment unit 60
attached to the outer tub 2 or a device provided inside the outer
tub 2, or a device provided separately from the washing tub. What
is important is that the electrolyzing device 31 is adapted to
electrolyze the water in use for the washing process to impart the
water with the cleaning capability without addition of the
detergent.
[0161] The washing machine according to the present invention is
not limited to the fully automatic washing machine. The invention
is applicable to a so-called drum type washing machine in which the
washing tub is constituted by an outer tub and a drum of horizontal
axis type provided in the outer tub. Further, the invention is
applicable to a so-called double tub washing machine in which a
single washing tub is provided separately from a dehydration
tub.
[0162] The water treatment means according to the present invention
is not limited to the electrolyzing device, but any treatment means
may be employed which performs a specific treatment on tap water to
impart the tap water with the cleaning capability. Further, the
present invention is not limited to the electrolysis of the tap
water alone. For promotion of the electrolysis of the tap water,
the electrolyzing process may be performed on an electrolytic
solution prepared by adding salt or sodium hydrogen carbonate to
the tap water.
[0163] The water stream generating means according to the present
invention is not limited to the pulsator. For example, the water
streams may be generated by rotating the washing/dehydration tub.
In this case, the washing/dehydration tub serves as the water
stream generating means. What is important is that the water stream
generating means is capable of generating water streams within the
washing tub.
[0164] The information means and the second information means
according to the present invention are not limited to the display
means such as the detergent amount display section and the zero
detergent display section. For example, means for notifying the
amount of the detergent and the non-addition of the detergent by
voice may be employed.
[0165] This application claims priority benefits under the
Convention on the basis of Japanese Patent Applications No.
2001-106923 and No. 2001-133252 filed with the Japanese Patent
Office on Apr. 5, 2001 and on Apr. 27, 2001, respectively, the
disclosure thereof being incorporated herein by reference.
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