EP0973968B1 - Washing method to achieve a superior washing performance by intermittent and variable oscillating drum movements - Google Patents

Washing method to achieve a superior washing performance by intermittent and variable oscillating drum movements Download PDF

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Publication number
EP0973968B1
EP0973968B1 EP97950572A EP97950572A EP0973968B1 EP 0973968 B1 EP0973968 B1 EP 0973968B1 EP 97950572 A EP97950572 A EP 97950572A EP 97950572 A EP97950572 A EP 97950572A EP 0973968 B1 EP0973968 B1 EP 0973968B1
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EP
European Patent Office
Prior art keywords
drum
washing
movements
clothes
washed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP97950572A
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German (de)
French (fr)
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EP0973968A2 (en
Inventor
Merih Atasehir Bulvari Pasin
Mustafa Semsettin Günaltay Cad TÜZÜNGÜC
Evren GÜNEN
Mehmet Kaya
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Arcelik AS
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Arcelik AS
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Application filed by Arcelik AS filed Critical Arcelik AS
Publication of EP0973968A2 publication Critical patent/EP0973968A2/en
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F35/00—Washing machines, apparatus, or methods not otherwise provided for
    • D06F35/005—Methods for washing, rinsing or spin-drying
    • D06F35/006—Methods for washing, rinsing or spin-drying for washing or rinsing only

Definitions

  • the process of penetrating water into the fibers as well as the aid of mechanical movement to washing are obtained by means of rotating the drum both in clockwise and anti-clockwise directions with full tours at a constant speed.
  • the rotational speed of the said movement is generally around 50-55 rpm and this value is determined according to the diameter of the drum. Due to the fact that the vertical component of the centrifugal force acting upon the clothes being washed is less than gravity just before the top point of the drum, the clothes are made to drop from the top point inside the drum down to the bottom of the drum.
  • washing performance of the washing machines with tubs placed on a horizontal axis is higher than that of the washing machines with vertically positioned tubs and with loading ports on the top.
  • the major reason of this is that the gravitational acceleration created due to its horizontal positioning assists together with the centrifugal acceleration created by rotation, the improvement of the process of removing dirt off the clothes.
  • a washing machine with a reversing mode is described in the document US 5560061 where the washing drum is intermittently driven in alternating rotary directions (reversing mode) during washing and/or rinsing, for accelerating the washing drum in one of the rotary directions to a first rpm being markedly below the contact rpm and accelerating the washing drum in the other of the rotary directions to a second rpm being markedly above the contact rpm.
  • One object of the present invention is to realize the rotational movements of any tub used in a washing machine as intermittent and with modulating oscillations, to increase or reduce the revolution cycle of the said tub with the desired acceleration that may be variable and to realize a method that provides an improvement in the washing performance by creating desired speed differences between water and clothes by means of stopping this movement at a desired angle and thus obtaining the intended falling angles and heights in desired cycles.
  • Another object of the present invention is to realize a method that assists keeping the wool clothes continuously in the water during washing cycle using less water, by applying to the drum the oscillating movements of variable amplitude and frequencies.
  • FIG. 1 A general schematic drawing of an embodiment wherein the method realized to achieve the objects of the present invention is applied, is attached to this document.
  • the tub is horizontally positioned and supported by the body (1) by using spring (3) and damper elements (2).
  • the drum (5) is positioned in' such a manner that it can perform rotational movements within the horizontal tub (4).
  • Clothes (6) are loaded into the drum and washing is performed by means of rotation around the drum shaft axis (7).
  • Drum movements are realized through the washing programmes selected in conformity with the type of the fabric to washed.
  • the drum rotates at approximately 3 rad/s 2 of angular acceleration and 20 rpm of rotational speed for 1.25 second clockwise and 1.25 seconds in anti-clockwise directions in order to meet the requirement of keeping the wool clothes to be washed continuously in water using less water and additionally in order to provide a better washing performance.
  • the drum never makes a full (complete) revolution and realizes an oscillating movement between the proper angle limit values towards both directions.
  • better shrinkage performance values as compared to a standard wool programme, can be obtained although 40% less main washing water is consumed.
  • the above mentioned oscillating movement can also be applied in cotton washing programme.
  • oscillation angles may reach to higher values compared to the wool programme during the washing cycle for cotton textiles.
  • the fact that the acceleration acting upon the fabric during washing is variable improves the dirt removal process' off the clothes. By means of variable accelerations cleaning chemicals are carried into the pores of the fabric and dirt removed off the fabric is carried away from the clothes more efficiently.
  • oscillating movement is provided in progressive amplitudes thus obtaining the modulation of the acceleration acting upon the fabric in the course of time, for cotton washing cases where washing performance is more important.
  • This movement which starts as small oscillations and progressively increases its amplitude until it reaches full-cycle levels, is repeated periodically all through the washing programme.
  • Another factor increasing the washing performance is simulating the rubbing action used while hand washing by providing the friction of the fabrics being washed.
  • the drum is rotated at such a speed that a centrifugal acceleration more than gravitational acceleration is obtained, thus the clothes in the tub are left immobile around the drum and the drum movement is suddenly stopped at 180° after the initial point, i.e. when the clothes are at the top point.
  • the clothes within the drum drop off the peak point downwards and thus the washing performance is improved.
  • the invention relates to a washing method obtaining a high washing performance by means of intermittent drum movements with varying directions, for a washing machine comprising a body, a tub spring and damper elements for supporting that tub by the body and a drum positioned in such a manner that it can rotate around its horizontal shaft axis; characterized in that the method comprises the steps of: rotating the drum once in the clockwise direction and then in the anti- clockwise direction while never making a complete revolution and realising an oscillating movement around the horizontal shaft axis.
  • a preferred embodiment of the washing method is a washing method achieving an excellent washing performance in the said washing machines with drums, by intermittent and variable oscillating drum movements characterized in that the drum movement in said machine is stopped at a desired angle, and desired dropping angles and heights can be obtained at desired cycles.
  • a preferred embodiment of the washing method is a washing method achieving an excellent washing performance in the said washing machines with drums, by intermittent and variable oscillating drum movements characterized in that the drum is rotated with such a revolution that it provides a higher centrifugal acceleration than the gravitational acceleration in order to keep the laundry being washed immobile around the periphery of the drum and the drums is stopped suddenly about 180° after the starting point or in other words when the clothes are at the top (peak) point, so that the clothes fall down from the top point within the drum.
  • a preferred embodiment of the washing method is a washing method used in the said washing machine with drum, during the wool washing cycle, that improves the washing performance with intermittent and variable oscillating drum movements, characterized in that the drum moves approximately at an angular acceleration of 2 to 4 radians/ sec ⁇ 2 and 15 to 25 rpm for 1.0 to 1.5 seconds in the clockwise direction and for 1.0 to 1.5 seconds in the anti clockwise direction and makes oscillating movements of variable angles ; and enables clothes being washed are continuously kept in water by using less water.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)

Abstract

The present invention is related to a method providing an improvement of the washing performance for the washing machines with horizontally positioned tubs and drums by making the drum movements intermittent and with modulating oscillation. In the method according to the present invention, the rotations of any drum used for washing are realized as intermittent and with variable oscillations, the rotational speed of the said drum being increased or reduced with the desired acceleration rate that may be variable and this movement can be stopped at any desired angle thus obtaining the intended falling angles and heights at the desired cylces and by creating the desired velocity differences between water and clothes to be washed, as the result of these movements, the washing performance is improved by means of various drum movements. Said drum movements are realized by means of the washing programmes selected with regard to the type of textile to be washed. While washing wool, the requirement of keeping the material to be washed continuously in water is met using less water by keeping said drum movements between given limit values.

Description

As the water used as the carrying medium during the washing operation is required priorly to carry the heat energy and the washing material (detergent) to the areas to be washed, and then to realize the process of removing the dirt decomposed from the textile (fabric) after being washed; a speed difference so that it can pass through the fibers of the fabric being washed and subsequently a difference of pressure acting on the water must be created. In addition to these, dirt is also removed off the fabric by mechanical movements through the friction provided between the fibers.
In the existing washing machines, the process of penetrating water into the fibers as well as the aid of mechanical movement to washing are obtained by means of rotating the drum both in clockwise and anti-clockwise directions with full tours at a constant speed. The rotational speed of the said movement is generally around 50-55 rpm and this value is determined according to the diameter of the drum. Due to the fact that the vertical component of the centrifugal force acting upon the clothes being washed is less than gravity just before the top point of the drum, the clothes are made to drop from the top point inside the drum down to the bottom of the drum.
Washing performance of the washing machines with tubs placed on a horizontal axis is higher than that of the washing machines with vertically positioned tubs and with loading ports on the top. The major reason of this is that the gravitational acceleration created due to its horizontal positioning assists together with the centrifugal acceleration created by rotation, the improvement of the process of removing dirt off the clothes.
In standard machines this process is realized by changing the number of drum revolutions. In this method, by keeping the vertical component of the centrifugal acceleration higher or lower than the gravitational acceleration, the drum angles or in other words the drop heights of the clothes within the drum at the moment of dropping (falling) can be controlled. Main problem seen in this method is the fact that the number of revolutions and the drop height cannot be controlled independently from each other. This limits the optimisation of the mechanical movements according to the characteristic of the fabric being washed.
A washing machine with a reversing mode is described in the document US 5560061 where the washing drum is intermittently driven in alternating rotary directions (reversing mode) during washing and/or rinsing, for accelerating the washing drum in one of the rotary directions to a first rpm being markedly below the contact rpm and accelerating the washing drum in the other of the rotary directions to a second rpm being markedly above the contact rpm.
Another significant drawback seen in the washing machines wherein the drum performs the washing operation by making a full cycle, is the fact that they have to receive in more water during the wool washing programme, as compared to other programmes. Wool clothing's must be continuously within water in order to obtain an acceptable degree of shrinkage. In cases when the drum makes a full cycle the only solution to provide this condition is receiving more water into the machine. This brings the water consumption of the machine during the wool washing programme to high values.
One object of the present invention is to realize the rotational movements of any tub used in a washing machine as intermittent and with modulating oscillations, to increase or reduce the revolution cycle of the said tub with the desired acceleration that may be variable and to realize a method that provides an improvement in the washing performance by creating desired speed differences between water and clothes by means of stopping this movement at a desired angle and thus obtaining the intended falling angles and heights in desired cycles.
Another object of the present invention is to realize a method that assists keeping the wool clothes continuously in the water during washing cycle using less water, by applying to the drum the oscillating movements of variable amplitude and frequencies.
A general schematic drawing of an embodiment wherein the method realized to achieve the objects of the present invention is applied, is attached to this document. Here, the tub is horizontally positioned and supported by the body (1) by using spring (3) and damper elements (2). The drum (5) is positioned in' such a manner that it can perform rotational movements within the horizontal tub (4). Clothes (6) are loaded into the drum and washing is performed by means of rotation around the drum shaft axis (7). Drum movements are realized through the washing programmes selected in conformity with the type of the fabric to washed.
During wool programme, the drum rotates at approximately 3 rad/s2 of angular acceleration and 20 rpm of rotational speed for 1.25 second clockwise and 1.25 seconds in anti-clockwise directions in order to meet the requirement of keeping the wool clothes to be washed continuously in water using less water and additionally in order to provide a better washing performance. Thus the drum never makes a full (complete) revolution and realizes an oscillating movement between the proper angle limit values towards both directions. As the result of the washing movement realised in this way, better shrinkage performance values as compared to a standard wool programme, can be obtained although 40% less main washing water is consumed.
Besides wool washing programme, the above mentioned oscillating movement can also be applied in cotton washing programme. As cotton fabrics do not require to be continuously kept in water, oscillation angles may reach to higher values compared to the wool programme during the washing cycle for cotton textiles. Additionally, the fact that the acceleration acting upon the fabric during washing is variable improves the dirt removal process' off the clothes. By means of variable accelerations cleaning chemicals are carried into the pores of the fabric and dirt removed off the fabric is carried away from the clothes more efficiently.
For these reasons oscillating movement is provided in progressive amplitudes thus obtaining the modulation of the acceleration acting upon the fabric in the course of time, for cotton washing cases where washing performance is more important. This movement which starts as small oscillations and progressively increases its amplitude until it reaches full-cycle levels, is repeated periodically all through the washing programme.
By increasing or reducing the drum speed with a desired and variable acceleration and by stopping the rotation at a desired angle, the dropping of the clothes down from a desired height can be provided.
Another factor increasing the washing performance is simulating the rubbing action used while hand washing by providing the friction of the fabrics being washed. For this purpose, in addition to the drum movement with variable oscillations, the drum is rotated at such a speed that a centrifugal acceleration more than gravitational acceleration is obtained, thus the clothes in the tub are left immobile around the drum and the drum movement is suddenly stopped at 180° after the initial point, i.e. when the clothes are at the top point. As the result of this, the clothes within the drum drop off the peak point downwards and thus the washing performance is improved.
In cotton washing programme, the above mentioned operational process with the oscillating movement of variable amplitudes and stopping the drum at 180° position are used together with the other drum movements and thus the washing performance increases significantly.
In other words, the invention relates to a washing method obtaining a high washing performance by means of intermittent drum movements with varying directions, for a washing machine comprising a body, a tub spring and damper elements for supporting that tub by the body and a drum positioned in such a manner that it can rotate around its horizontal shaft axis; characterized in that the method comprises the steps of: rotating the drum once in the clockwise direction and then in the anti- clockwise direction while never making a complete revolution and realising an oscillating movement around the horizontal shaft axis. A preferred embodiment of the washing method is a washing method achieving an excellent washing performance in the said washing machines with drums, by intermittent and variable oscillating drum movements characterized in that the drum movement in said machine is stopped at a desired angle, and desired dropping angles and heights can be obtained at desired cycles. A preferred embodiment of the washing method is a washing method achieving an excellent washing performance in the said washing machines with drums, by intermittent and variable oscillating drum movements characterized in that the drum is rotated with such a revolution that it provides a higher centrifugal acceleration than the gravitational acceleration in order to keep the laundry being washed immobile around the periphery of the drum and the drums is stopped suddenly about 180° after the starting point or in other words when the clothes are at the top (peak) point, so that the clothes fall down from the top point within the drum. A preferred embodiment of the washing method is a washing method used in the said washing machine with drum, during the wool washing cycle, that improves the washing performance with intermittent and variable oscillating drum movements, characterized in that the drum moves approximately at an angular acceleration of 2 to 4 radians/ sec^2 and 15 to 25 rpm for 1.0 to 1.5 seconds in the clockwise direction and for 1.0 to 1.5 seconds in the anti clockwise direction and makes oscillating movements of variable angles ; and enables clothes being washed are continuously kept in water by using less water.

Claims (4)

  1. A washing method obtaining a high washing performance by means of intermittent drum movements with varying directions, for a washing machine comprising a body. (1), a tub (4), spring (3) and damper elements (2) for supporting the tub (4) by the body (1), and a drum (5) positioned in such a manner that it can rotate around its horizontal shaft axis (7) within the said tub (4), charactersized in that the method comprises the steps of: rotating the drum (5) once in the clockwise direction and then in the anti-clockwise direction while never making a complete revolution and realising an oscillating movement around the horizontal shaft axis (7).
  2. A washing method according to claim 1, characterized in that, the drum (5) movement in said machine is stopped at a desired angle, and desired dropping angles and heights can be obtained at desired cycles.
  3. A washing method according to claims 1 and 2, characterized in that, the drum (5) is rotated with such a revolution that a higher centrifugal acceleration than the gravitational acceleration is provided in order to keep the laundry being washed immobile around the periphery of the drum (5) and the drum (5) is stopped suddenly about 180° after the starting point or in other words when the clothes are at the top (peak) point, so that the clothes drop down from the top point within the drum (5).
  4. A washing method according to claim 1, characterized in that, the drum (5) moves approximately at an angular acceleration of 2 to 4 radians/ sec2 and 15 to 25 rpm for 1.0 to 1.5 seconds in the clockwise direction and for 1.0 to 1.5 seconds in the anti-clockwise direction and makes oscillating movements of variable angles; and enables the clothes being washed are continuously kept in water by using less water.
EP97950572A 1996-12-30 1997-12-30 Washing method to achieve a superior washing performance by intermittent and variable oscillating drum movements Expired - Lifetime EP0973968B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
TR96/01081A TR199601081A2 (en) 1996-12-30 1996-12-30 A laundry washing method that achieves superior washing performance with intermittent and variable oscillating drum movements.
TR1008196 1996-12-30
PCT/TR1997/000025 WO1998029594A2 (en) 1996-12-30 1997-12-30 Washing method to achieve a superior washing performance by intermittent and variable oscillating drum movements

Publications (2)

Publication Number Publication Date
EP0973968A2 EP0973968A2 (en) 2000-01-26
EP0973968B1 true EP0973968B1 (en) 2003-05-07

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EP97950572A Expired - Lifetime EP0973968B1 (en) 1996-12-30 1997-12-30 Washing method to achieve a superior washing performance by intermittent and variable oscillating drum movements

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EP (1) EP0973968B1 (en)
AT (1) ATE239814T1 (en)
AU (1) AU5353998A (en)
DE (1) DE69721834T2 (en)
ES (1) ES2199381T3 (en)
TR (1) TR199601081A2 (en)
WO (1) WO1998029594A2 (en)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10031037A1 (en) * 2000-06-14 2001-12-20 Pharmagg Systemtechnik Gmbh Method for managing wet washing by varying peripheral speed of washer drum
JP3643772B2 (en) * 2000-12-05 2005-04-27 株式会社東芝 Drum washing machine
CN100482876C (en) * 2004-09-23 2009-04-29 宁国聚隆实业有限公司 Full-automatic horizontal rubbing swing washer and washing mode
DE102005003696A1 (en) * 2005-01-26 2006-07-27 BSH Bosch und Siemens Hausgeräte GmbH A method for reducing the risk shrinking delicate washing materials in horizontal axis clothes washing machines has short drum rotations all in the same direction to drain trapped liquor on the clothes
ATE498725T1 (en) † 2005-11-11 2011-03-15 Lg Electronics Inc DRUM WASHING MACHINE AND TUB CLEANING METHOD THEREOF
US8966944B2 (en) 2008-08-01 2015-03-03 Lg Electronics Inc. Control method of a laundry machine
US20100024137A1 (en) * 2008-08-01 2010-02-04 Myong Hum Im Washing machine and washing method therefor
US9416478B2 (en) 2009-03-31 2016-08-16 Lg Electronics Inc. Washing machine and washing method
AU2010214203B2 (en) 2009-02-11 2013-08-22 Lg Electronics Inc. Washing method and washing machine
US9234307B2 (en) 2009-07-27 2016-01-12 Lg Electronics Inc. Control method of a laundry machine
KR20110048345A (en) * 2009-11-02 2011-05-11 엘지전자 주식회사 Laundry method and washing machine
US10533275B2 (en) 2009-07-27 2020-01-14 Lg Electronics Inc. Control method of a laundry machine
US9695537B2 (en) 2009-07-27 2017-07-04 Lg Electronics Inc. Control method of a laundry machine
US9822473B2 (en) 2009-07-27 2017-11-21 Lg Electronics Inc. Control method of a laundry machine
WO2011025311A2 (en) * 2009-08-27 2011-03-03 Lg Electronics Inc. Control method of laundry machine
US9045853B2 (en) 2009-10-13 2015-06-02 Lg Electronics Inc. Laundry treating apparatus
US8776297B2 (en) 2009-10-13 2014-07-15 Lg Electronics Inc. Laundry treating apparatus and method

Family Cites Families (2)

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Publication number Priority date Publication date Assignee Title
DE4310595A1 (en) * 1993-03-31 1994-10-06 Bosch Siemens Hausgeraete Washing machine with a reversing laundry drum
DE4336349A1 (en) * 1993-10-25 1995-04-27 Bosch Siemens Hausgeraete Method for determining the mass of wet laundry in a laundry drum

Also Published As

Publication number Publication date
ATE239814T1 (en) 2003-05-15
WO1998029594A2 (en) 1998-07-09
WO1998029594A3 (en) 1998-10-01
TR199601081A2 (en) 1998-07-21
AU5353998A (en) 1998-07-31
EP0973968A2 (en) 2000-01-26
DE69721834T2 (en) 2004-04-08
DE69721834D1 (en) 2003-06-12
ES2199381T3 (en) 2004-02-16

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