Patent Publication Number: US-8978423-B2

Title: Control method of a laundry treatment machine

Description:
This application claims priority from Korean Patent Application No. 10-2009-0067376 filed on Jul. 23, 2009, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to control method of a laundry treatment machine, and more particularly, to control method of a laundry treatment machine that fabric can be evenly soaked by spraying water through a spray nozzle. 
     2. Description of the Conventional Art 
     In general, fabric treating machine include a washing machine for removing contaminants stuck to clothes, beddings and the like (hereinafter, referred to as “fabric”) by using water, detergent and a mechanical action, a drying machine for drying wet fabric using dried hot air heated by a heater and a mechanical action, and a washing/drying machine having both a washing function and a drying function. 
     The washing machine can be classified into a top load type washing machine that has a fabric entrance formed at the top of a cabinet thereof and washes fabric according to revolving water flow generated when an inner tub is rotated and a drum type washing machine that has a fabric entrance formed at the front side of a cabinet thereof and washes fabric according to fabric fall occurring when a drum is rotated. 
     A conventional top load type washing machine includes a cabinet that forms the external appearance of the washing machine and has an opened top face, a top cover that is combined with the opened top face of the cabinet and has a fabric entrance formed therein, a door mounted to rotate on the fabric entrance, a base disposed at the bottom of the cabinet, an outer tub disposed in the cabinet for containing water therein, an inner tub located in the outer tub for washing fabric, a motor unit located under the inner tub to rotate the inner tub, a water supply unit for supplying water into the outer tub, and a drain unit for draining water from the outer tub. Furthermore, the washing machine includes a detergent supply unit connected to the water supply unit to supply detergent with water. 
     The washing machine further includes a pulsator for generating a water flow. The pulsator may be formed or installed at the bottom face of the inner tub. 
     In the conventional washing machine, the inner tub and the pulsator are rotated to the same direction or the different direction, and thus a washing step, a rinse step and a dehydration step may be performed. 
     However, in the conventional top load type washing machine, the water supply unit and the detergent supply unit are disposed at one side of the top of the cabinet, and thus washing water and the detergent are supplied to only one side of the inner tub. Accordingly, fabric is not evenly soaked. In this case, washing and rinsing performances are deteriorated. 
     Recently, water is sprayed by a spray nozzle for soaking the fabric evenly. But, in case of water spray, there is a problem that an effect of water penetration is decreased. 
     SUMMARY OF THE INVENTION 
     It is an object of the present invention to provide control method of a laundry treating machine that water consumption can decrease and fabric can be evenly soaked and an effect of water penetration and rinsing performance can be improved. 
     To accomplish the object of the present invention, there is provided control method of a laundry machine comprising a spray rinse step that a portion of water which is predetermined to be used all for the rinse step is sprayed by a spray nozzle and a inner tub is rotated; and a spin rinse step that the water supply through the spray nozzle is shut off and the inner tub is rotated; wherein the spray rinse step and the spin rinse step is repeated in order for the predetermined number of times. 
     In the present invention, a drain pump is always operated for the spray rinse step and the spin rinse step. 
     In the present invention, the spray rinse step further includes that the inner tub is rotated with the predetermined constant rotating speed. 
     In the present invention, the spin rinse step further includes that a motor is rotated and accelerated for the predetermined time. 
     In the present invention, the spray rinse step is repeated several times for the rinse step, the amount of the water which is sprayed for the each spray rinse step is set by being divided the total amount of water used for the rinse step by the performing number of the spray rinse step equally. 
     In the present invention, the performing time of the spin rinse step is set longer than the performing time of the spray rinse step. 
     In the present invention, the spin rinse step comprises a constant spin rinse step that the inner tub is rotated with the predetermined constant speed for the predetermined time; and an accelerated spin rinse step that the inner tub is accelerated for the predetermined time. 
     In the present invention, the constant spin rinse step and the accelerated spin rinse step are alternatively performed after the spray rinse step. 
     In the present invention, a cycle is comprised that the spray rinse step, the constant spin rinse step, the spray rinse step and the accelerated spin rinse step are once performed in order, and the cycle is repeated several times. 
     In the present invention, the spray rinse step includes that the inner tub is rotated with a first rotating speed which is predetermined. 
     In the present invention, the constant spin rinse step includes that the inner tub is rotated with a second rotating speed which is faster than the first rotating speed for the predetermined time. 
     In the present invention, the accelerated spin rinse step includes that the inner tub is rotated with the accelerated speed from the first rotating speed for the predetermined time. 
     In the present invention, the accelerated spin rinse step includes that the inner tub is accelerated at a high speed which is faster than the second rotating speed for the predetermined time. 
     In the present invention, the process time of the constant spin rinse step is set shorter than the process time of the accelerated spin rinse step. 
     In the present invention, the drain pump is always operated in the spray rinse step, the constant spin rinse step and the accelerated spin rinse step. 
     In the present invention, the amount of the water which is sprayed for the each spray rinse step is set by being divided the total amount of water used for the rinse step by the performing number of the spray rinse step equally. 
     In another aspect of the present invention, there is provided Control method of a laundry machine comprising a first spray rinse step that water is sprayed by a spray nozzle and a inner tub is rotated with a first rotating speed for the predetermined time; and a constant spin rinse step, which is performed after the first spray rinse step is finished, that the water supply through the spray nozzle is shut off and the inner tub is accelerated to a second rotating speed which is faster than the first rotating speed for the first set time and then is rotated with maintaining the second rotating speed; and a second spray rinse step, which is performed after the constant spin spray rinse step is finished, that the water is sprayed by the spray nozzle and the inner tub is rotated with the first rotating speed for the predetermined time; and an accelerated spin rinse step, which is performed after the second spray rinse step is finished, that the water supply through the spray nozzle is shut off and the inner tub is accelerated from the first second rotating speed for a second set time which is longer than the first set time; wherein a cycle is comprised of the first spray rinse step, the constant spin rinse step, the second spray rinse step and the accelerated spin rinse step, and the cycle is repeated for the several times. 
     In the present invention, the amount of water which is sprayed in the first spray rinse step is equal to the amount of water which is spray in the second spray rinse step. 
     In the present invention, the accelerated spin rinse step includes that the inner tub is rotated with an accelerated speed which is faster than the second rotating speed for the predetermined time. 
     In the present invention, the drain pump is always operated for a plurality of the cycles. 
     Control method of a laundry treatment machine according to the present invention is to perform a spin rinse step between spray rinse steps and not to spray total water at once but to spray a little water at a time. Therefore, fabric can be effectively soaked and the water penetration can be improved, and thus rinsing performances can be improved. 
     Also, because the spray rinse step comprises that the inner tub is rotated at low speed, it can be prevented that water sprayed through the spray nozzle spattered. 
     Also, because the spin rinse step comprises that the water spray is temporarily stopped and the inner tub is rotated at high speed, it can be prevented that water spattered, and an effect of water penetration can be improved by centrifugal force. 
     Also, a cycle is comprised of the spray rinse step and the spin rinse step. A rinsing performance can be improved by repeating the cycle several times. 
     Also, control method of a laundry treating machine according to the present invention includes the spin rinse step that comprises a constant spin rinse step for rotating the inner tub at high speed constantly and an accelerated spin rinse step for accelerating the inner tub for a time longer than a process time of the constant spin rinse step. The constant spin rinse step and the accelerated spin rinse step are alternatively performed, so that an effect of water penetration can be improved. 
     Also, control method of a laundry treatment machine according to the present invention comprises a cycle which comprises a first spray rinse step and a constant spin rinse step and a second spray rinse step and an accelerated spin rinse step. The cycle is repeated several times so that an effect of water penetration can be improved. 
     Also, because a drain pump is always operated in the present invention, the water rinsed fabrics can be instantly discharged. Thus, it can be prevented that fabrics is polluted by water rinsed fabrics. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWING 
         FIG. 1  is a perspective view which illustrates a top load type washing machine according to a first exemplary embodiment of the present invention. 
         FIG. 2  is a longitudinal section view which illustrates the washing machine shown in  FIG. 1 . 
         FIG. 3  is a side view showing a spray rinse condition of the washing machine according to the first exemplary embodiment of the present invention. 
         FIG. 4  is a block diagram showing the control flow of the washing machine according to the first exemplary embodiment of the present invention. 
         FIG. 5  is a flow chart showing a control method of the washing machine according to the first exemplary embodiment of the present invention. 
         FIG. 6  is a graph showing a rotating speed of an inner tub when a spray rinse step and a spin rinse step is each performed once. 
         FIG. 7  is a flow chart showing a control method of the washing machine according to a second exemplary embodiment of the present invention. 
         FIG. 8  is a graph showing a rotating speed of an inner tub when a spray rinse step and a spin rinse step is each performed once. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     A top load type washing machine (referred to as ‘washing machine’ hereinafter) will now be explained as an embodiment of a laundry treatment machine according to the present invention with reference to the attached drawings. 
       FIG. 1  is a perspective view which illustrates a top load type washing machine according to a first exemplary embodiment of the present invention.  FIG. 2  is a longitudinal section view which illustrates the washing machine shown in  FIG. 1 . 
     Referring to  FIG. 1  and  FIG. 2 , a washing machine according a first exemplary embodiment of the present invention comprises a case  1  forming the external appearance of the washing machine and a leg assembly  10  combined with the bottom of the case  1 . 
     The case  1  includes a cabinet  2  that has an opened top face and an opened bottom face and forms the side of the washing machine, a top cover  3  for covering the opened top face of the cabinet  2 , and a base  5  located on the opened bottom face of the cabinet  2 . 
     The cabinet  2  includes an outer tub  4  for containing water, an inner tub  6  that is disposed in the outer tub  4  and has fabric loaded therein, a driver such as a motor  8  for driving the inner tub  6 , a water supply assembly for supplying water to the inside of the outer tub  4 , and a drain assembly  20  for draining the water contained in the outer tub  4  after a washing or spin-drying operation is finished. 
     In addition, the washing machine further includes a detergent supply unit  30  for temporarily storing detergent, which is disposed on the top cover  3 . The detergent supply unit  30  is connected to the water supply assembly and provides the detergent with supplied water to the inner tub  6 . 
     The top cover  3  includes a fabric entrance  3   a  through which fabric is put in or out of the inner tub  6  and a door  40  for opening/closing the fabric entrance  3   a . The door  40  may be partially made of glass such that the inside of the washing machine is seen. The door  40  includes a frame  40   a  and a glass part  40   b  fitted in the frame  40   a.    
     Further, a display panel  7  for inputting an instruction for operating the washing machine or displaying an operating state of the washing machine is attached to one side of the top cover  3 . 
     The outer tub  4  is suspended from the top of the inside of the cabinet  2  by a plurality of suspensions  15 . One end of each suspension  15  may be combined with the top of the inside of the cabinet  2  and the other end thereof may be combined with the bottom of the outer tub  4 . 
     A pulsator  9  is disposed on the bottom of the inner tub  6  to generate a rotating stream in water contained in the outer tub  4 . The pulsator  9  may be integrated with the inner tub  6  and rotated with the inner tub  6  when the motor rotates. Otherwise, the pulsator  9  may be formed independently of the inner tub  6  and rotated independent of the inner tub  6  when the motor rotates. 
     A balancer  12  is disposed at an upper portion of the inner tub  6  to prevent the inner tub  6  from losing its balance due to eccentricity of fabric. The balancer  12  includes a liquid balancer filled with a liquid such as salt water. 
     An outer tub cover  14  for preventing escape of fabric or scattering of water is disposed on the outer tub  4 . 
     The water supply assembly includes an outer hose  11  for guiding water supplied from an external tap to the washing machine, a water supply valve  12  connected to the outer hose  11  to control supply of water, and a water supply hose  13  for connecting the water supply valve  12  and the detergent supply unit  30 . A water supply passage is formed by the water supply valve  12  and the water supply hose  13 . 
     The detergent supply unit  30  is disposed on the water supply passage. The detergent supply unit  30  includes a detergent box housing  31  connected with the water supply hose  13 , a detergent box  32  detachably set in the detergent box housing  31 , and a detergent box cover fixed to the detergent box housing and disposed on the detergent box  32  to spray water. 
     The detergent box housing  31  is fitted in a detergent box installing part formed at one side of the top cover  3 . 
     The detergent box  32  is combined with the detergent box housing  31  such that a user can take out the detergent box  32  from the detergent box housing  31  to put detergent into the detergent box. The detergent box  32  may slide into/out of the detergent box housing  31  in the forward/backward direction. At least a part of the backside of the detergent box  32  is opened such that the detergent can be provided to the detergent box housing  31  with water through the backside of the detergent box  32  when the water is supplied. 
     The drain assembly  20  includes a first drain hose  21  connected to a lower portion of the outer tub  4 , a drain valve  22  disposed on the first drain hose  21  to control drainage of water, a drain pump housing  24  having a drain pump for pumping water, and a second drain hose  25  connected to the drain pump housing  24  to drain water pumped by the drain pump to the outside of the cabinet  2 . A drain motor for driving the drain pump is disposed inside the drain pump housing  24 . 
     The drain assembly  20  may be disposed between the outer tub  4  and the base  5 . 
       FIG. 3  is a side view showing a spray rinse condition of the washing machine according to the first exemplary embodiment of the present invention. 
     Referring to  FIG. 1  and  FIG. 3 , The water supply assembly  10  further includes the spray nozzle  50  for spraying water supplied from the water supply passage to the inside of the inner tub  6 . The spray nozzle  50  may be disposed in the top cover  3  or the detergent supply unit  30 . In the embodiment of the present invention, it is described that the spray nozzle  50  is disposed in the top cover  3 . 
       FIG. 4  is a block diagram showing the control flow of the washing machine according to the first exemplary embodiment of the present invention. 
     Referring to  FIG. 4 , the washing machine comprises an input unit  7   a  disposed on the display panel  7  for inputting an instruction for operating the washing machine, a voltmeter  52  for sensing a change of voltage of the motor  8 , a control unit  60  which receives a signal of the input unit  7   a  and the voltmeter  52  and then controls the operation of the spray nozzle  50 , the motor  8 , and the drain pump  24  according to the signal. 
       FIG. 5  is a flow chart showing a control method of the washing machine according to the first exemplary embodiment of the present invention.  FIG. 6  is a graph showing a rotating speed of an inner tub when a spray rinse step and a spin rinse step is each performed once. 
     Referring to  FIGS. 5 and 6 , a control method of the washing machine according to an exemplary embodiment of the present invention will hereinafter be described in detail. 
     If a rinse step is started, the control unit  60  set the number of times to zero. (S 1 ) 
     And then, the control unit  60  performs a spray rinse step that water is sprayed to the inner tub  6  by the spray nozzle  50  and the inner tub  6  is rotated. (S 10 ) The control unit  60  controls the motor  8  to rotate, and the motor  8  rotates the inner tub  6 . 
     In the spray rinse step S 10 , a portion of the water which is predetermined to be used is supplied to the inner tub  6  by the spray nozzle  50 . (S 11 ) The total amount of water used in the total rinse step may be predetermined according to the amount of the fabrics or the type of the fabrics. 
     The amount of the water which is sprayed for the each spray rinse step S 10  may be set by being divided the total amount of water used for the total rinse step by the performing number of the spray rinse step S 10  equally. 
     For example, in the first exemplary embodiment, the total amount of water used for the total rinse step is about 24 l, the performing number of the spray rinse step S 10  is three. Thus, when the spray rinse step S 10  is once performed, the amount of the water sprayed may be set to 8 l. 
     During the spray rinse step S 10 , the inner tub  6  is constantly rotated with a first rotating speed V 1  which is predetermined. (S 11 ) The first rotating speed may be set by a test, etc. The first rotating speed V 1  may be predetermined for preventing spattering of the water sprayed by the spray nozzle  50  while the inner tub  6  is rotated. Referring to  FIG. 6 , the exemplary embodiment of the present invention is described that the first rotating speed V 1  is about 25 rpm as an example. 
     If the inner tub  6  is rotated with the first rotating speed V 1 , the water sprayed by the spray nozzle  50  can be penetrated into fabrics by centrifugal force. Then, the water penetrated into fabrics can be discharged to the outside of the inner tub  6  through holes of the inner tub  6 . 
     Also, the drain pump  24  is always operated during the spray rinse step (S 10 ). The water discharged into the outside of the inner tub  6  through holes of the inner tub  6  may be discharged into the outside of the washing machine by pumping of the drain pump  24 . Because the water rinsed fabrics can be instantly discharged, it can be prevented that fabrics is polluted by the water rinsed fabrics. Therefore, a rinsing performance can be improved. 
     The spray rinse step S 10  may be continued to perform according the predetermined time or the amount of water sprayed. In the exemplary embodiment of the present invention, it is described that the controller  60  may judge whether the predetermined time t1 is passed or not. If the predetermined time t1 is passed, the spray rinse step S 10  may be finished. (S 14 ) 
     If the spray rinse step S 10  is finished, the controller  60  performs a spin rinse step S 20  that the water supply through the spray nozzle  50  is shut off and the inner tub  6  is rotated at high speed. 
     During the spin rinse step S 20 , the water supply through the spray nozzle  50  is shut off. (S 21 ) During the spin rinse step S 20 , because the inner tub  6  is rotated at high speed faster than a rotating speed of the spray rinse step S 10 , the water supply through the spray nozzle  50  is shut off. Thus, it is possible to prevent spattering of the water sprayed. 
     The spin rinse step S 20  is performed the acceleration rotation of the inner tub  6  by increasing the rotating speed of the inner tub  6 . (S 22 ) 
     Meanwhile, the drain pump  24  is always operated. (S 23 ) 
     Namely, during the spin rinse step S 20 , the water spray is shut off and the inner tub  6  is rotated at high speed by the rotation of the motor  8 . 
     The inner tub  6  is rotated at accelerated speed faster than the first rotating speed V 1  so that an effect of water penetration can be improved by the centrifugal force generated by the rotation of the inner tub. The rotating speed of the inner tub  6  during the spin rinse step S 20  is faster than the rotating speed of the inner tub  6  during the spray rinse step S 10 . Thus, the centrifugal force generated from the spin rinse step S 20  is larger than that of the spray rinse step S 10  so that an effect of water penetration can be improved. 
     The controller judges whether the predetermined time t2−t1 is passed or not S 24 , and the spin rinse step S 20  is continued until the predetermined time t2−t1 is passed. 
     The process time t2−t1 of the spin rinse step S 20  may be set to be longer than the process time t1 of the spray rinse step S 10 . This is a quite advantageous condition so as to improve an effect of water penetration. 
     As described above, a cycle is comprised of one spray rinse step S 10  and one spin rinse step S 20 . The controller  60  may repeat the cycle several times. 
     When the spin rinse step S 20  is finished, the controller  60  counts up the number of cycle times that the spray rinse step S 10  and the spin rinse step S 20  are performed in order. 
     The controller  60  repeats the cycle for predetermined the number of times. Namely, the spray rinse step S 10  and the spin rinse step S 20  are repeated in order for predetermined the number of times. 
     In the exemplary embodiment of the present invention, it is described that each of the spray rinse step S 10  and the spin rinse step S 20  is performed three times. If three times of the performance are over, the rinse step is finished. (S 25 ) 
     Therefore, the present invention is not to spray total water at once but to spray a little water at one time and then performs the spin rinse step rotating the inner tub  6 . Therefore, fabrics can be effectively soaked and the water penetration can be improved, and thus the rinsing performances can be improved. 
       FIG. 7  is a flow chart showing a control method of the washing machine according to a second exemplary embodiment of the present invention.  FIG. 8  is a graph showing a rotating speed of an inner tub when a spray rinse step and a spin rinse step is each performed once. 
     Referring to  FIGS. 7 and 8 , a control method of the washing machine according to the second exemplary embodiment of the present invention will hereinafter be described in detail. 
     If a rinse step is started, the control unit  60  set the number of times to zero. (S 50 ) 
     The control unit  60  performs a first spray rinse step that water is sprayed to the inner tub  6  by the spray nozzle  50  and the inner tub  6  is rotated. (S 60 ) 
     During the first spray rinse step S 60 , a portion of the water which is predetermined to be used is supplied to the inner tub  6  by the spray nozzle  50 . (S 61 ) The total amount of water used in the total rinse step may be predetermined according to the amount of the fabrics or the type of the fabrics. 
     The amount of the water which is sprayed for one time of the first spray rinse step S 60  may be set by being divided the total amount of water used for the total rinse step by the performing number of the first spray rinse step S 60  equally. 
     For example, in the second exemplary embodiment, the total amount of water used for the total rinse step is about 24 l, each of the first spray rinse step S 60  and a second spray rinse step S 80  are performed three times. Thus, when the first spray rinse step S 60  is once performed, the amount of the water sprayed is set 4 l. 
     Also, during the first spray rinse step S 60 , the inner tub  6  is constantly rotated with a first rotating speed V 1  which is predetermined. (S 61 ) The first rotating speed V 1  may be set by a test, etc. The first rotating speed V 1  may be predetermined for preventing spattering of the water sprayed by the spray nozzle  50  when the inner tub  6  is rotated. 
     Referring to  FIG. 8 , the exemplary embodiment of the present invention is described that the first rotating speed V 1  is about 25 rpm as an example. 
     The drain pump  24  is always operated during the first spray rinse step S 60 . The water discharged into the outside of the inner tub  6  through holes of the inner tub  6  may be discharged to the outside of the washing machine by the pumping of the drain pump  24 . Because the water rinsed fabrics can be instantly discharged, it can be prevented that fabrics is polluted by water rinsed fabrics. Therefore, a rinsing performance can be improved. 
     The controller  60  may judge whether the predetermined time t11 is passed or not. (S 64 ) If the predetermined time is passed, the first spray rinse step (S 60 ) is finished. 
     Thereafter the controller  60  performs a spin rinse step that the water supply through the spray nozzle  50  is shut off and the inner tub  6  is rotated. 
     The control method according to the second exemplary embodiment of the present invention, the spin rinse step comprises a constant spin rinse step S 70  that the inner tub is rotated with the predetermined second rotating speed V 2  and an accelerated spin rinse step S 90  that the inner tub is accelerated for the predetermined time. The constant spin rinse step S 70  and the accelerated spin rinse step S 90  will be described later. 
     The constant spin rinse step S 70  may be performed after the first spray rinse step S 60 . 
     During the constant spin rinse step S 70 , the water supply through the spray nozzle  50  is shut off. (S 71 ) 
     Also, during the constant spin rinse step S 70 , the inner tub  6  is rotated with the predetermined second rotating speed V 2 . (S 72 ) 
     The second rotating speed V 2  may be set to be faster than the first rotating speed V 1 . 
     The second rotating speed V 2  is about 100 rpm as an example in the exemplary embodiment of the present invention. If the inner tub  6  is rapidly rotated with the second rotating speed V 2 , the water sprayed during the first spray rinse step S 60  can be penetrated into fabrics by centrifugal force. Then, the water penetrated into fabrics can be discharged to the outside of the inner tub  7  through holes of the inner tub  6 . 
     The rotating speed of the inner tub  6  during the constant spin rinse step S 70  is faster than the rotating speed of the inner tub  6  during the first spray rinse step S 60 . Thus, the centrifugal force generated during the constant spin rinse step S 70  is larger than that of the first spray rinse step S 60  so that an effect of water penetration can be improved. 
     The drain pump  24  is always operated during the constant spray rinse step S 70 . Because the water rinsed fabrics can be instantly discharged, it can be prevented that fabrics is polluted by water rinsed fabrics. (S 73 ) 
     The constant spin rinse step S 70  is performed for the first set time t12−t11. If the first set time t12−t11 passes S 74 , the constant spin rinse step S 70  is finished. 
     When the constant spin step S 70  is finished, the controller  60  performs the second spray rinse step S 80 . 
     The contents of the second spray rinse step S 80  is similar to that of the first spray rinse step S 60 . During the second spray rinse step S 80 , the water is supplied to the inner tub  6  by the spray nozzle  50 , and the inner tub  6  is rotated with the first rotating speed V 1 , and the drain pump  24  is operated. S 83   
     The amount of the water sprayed in the second spray rinse step S 80  is equal that of the first spray rinse step S 60 . Namely, the amount of the water sprayed is 4 l. 
     The second spray rinse step S 80  is performed for the predetermined time t13−t12. If the predetermined time t13−t12 is passed, the second spray rinse step S 80  is finished. 
     If the second spray rinse step S 80  is finished, the controller  60  performs the accelerated spin rinse step S 90 . 
     During the accelerated spin rinse step S 90 , the rotating speed of the inner tub  6  is accelerated for the second set time t14−t13. (S 91 ) Meanwhile, the drain pump is maintained to be operated. (S 92 ) 
     The accelerated spin rinse step S 90  is performed for the second set time t14−t13. The controller  60  judge whether the second set time t14−t13 passes or not. (S 93 ) 
     During the accelerated spin rinse step S 90 , the inner tub  6  is accelerated by the acceleration of the motor  8 . Thus, the water sprayed during the second spray rinse step S 80  can be penetrated into fabrics by the centrifugal force. 
     The accelerated spin rinse step S 90  may be performed that the inner tub  6  is accelerated to be faster than the second rotating speed V 2  of the constant spin rinse step S 70 . 
     The process time t14−t13 of the accelerated spin rinse step S 90  is set to be longer than the process time t12−t11 of the constant spin rinse step S 70 . 
     Namely, the accelerated spin rinse step S 90  may be performed that the inner tub  6  is accelerated faster and longer than the constant spin rinse step S 70 . 
     A cycle is comprised that the first spray rinse step S 60 , the constant spin rinse step S 70 , the second spray rinse step S 80  and the accelerated spin rinse step S 90  are once performed in order. 
     The controller  60  may perform the cycle several times. 
     The controller  60  counts up the number of cycle times which the first spray rinse step S 60 , the constant spin rinse step S 70 , the second spray rinse step S 80  and the accelerated spin rinse step S 90  are performed in order. (S 94 ) 
     The controller  60  repeats the cycle for predetermined number of times. 
     In the exemplary embodiment of the present invention, it is described that the cycle is performed three times. Namely, if the first spray rinse step S 60 , the constant spin rinse step S 70 , the second spray rinse step S 80 , the accelerated spin rinse step S 90  are performed in order for three times, the rinse step is finished. (S 95 ) 
     Therefore, the present invention is not to spray total water at once but to spray a little water at one time, and then performs the spin rinse step rotating the inner tub  6 . Therefore, fabric can be effectively soaked and the water penetration can be improved, and thus rinsing performances can be improved. 
     While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims.