JP2014079350A - Washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drum type washing machine capable of improving washing performance and reducing washing time.SOLUTION: The drum type washing machine includes: a rotary drum 3 for housing laundry; a water receiving tub 2 for housing the rotary drum 3; a water supply valve 11 for supplying water into the water receiving tub 2; water level detection means 12 for detecting a water level in the water receiving tub 2; a circulation pump 10 for causing washing water and rinse water in the water receiving tub 2 to be discharged into the rotary drum 3; an air channel having a heater 23 for leading warm air into the rotary drum 3; and control means 14 for controlling the water supply valve 11, the circulation pump 10 and the heater 23, and executing a washing process. The control means 14 executes a second washing process including heating laundry with an introduction of warm air, heated steam, or mist into the rotary drum 3 and a rotation of the rotary drum 3, with respect to the laundry whose water content is reduced by a water discharge and dewatering after the completion of a washing process, and executes a water supply and rinsing without performing an intermediate dewatering in a first rinsing in a rinsing process which is repeated two or more times after the completion of the second washing process.

Description

  The present invention relates to a washing machine in which laundry is placed in a rotating drum, and washing is performed by sequentially controlling each process such as washing and rinsing.

  2. Description of the Related Art Conventionally, a drum-type washing machine is provided with a path for circulating washing water collected at the bottom of a water tub in a rotating drum in order to improve washing power and washing performance at the time of washing and water saving. As a result, it is possible to increase the contact between the washing water and the clothes, to separate the dirt by the jet power of the circulating water, or to wet the laundry even with a small amount of water.

  Furthermore, the heating means is provided at the bottom, and the washing power and the rinsing performance are also improved by heating the washing water to improve the washing performance. However, in a washing machine with a small amount of water to be used, especially a drum type washing machine, if the washing water is circulated, the level of the washing water at the bottom may decrease, and the surface of the heating means may come out of the washing water surface. is there. If the heating means is continuously energized in this state, the surface of the heating means becomes overheated, the constituent resin material is dissolved, and the heating means itself may be disconnected. In addition, there is a problem that it takes a long time to heat the washing water to a predetermined temperature by the heating means, and the power consumption is large and uneconomical. On the other hand, in a washing machine equipped with a warm air supply device for supplying warm air, the laundry is stored in a rotating drum disposed in the water tank, and the laundry is stirred and washed by supplying water to the water tank. Thereafter, draining from the water tank, and then stirring the laundry, supplying warm air to the inside of the water tank by the warm air supply device to heat the laundry and further washing It has been devised (see, for example, Patent Document 1).

JP 2006-247062 A

  However, in such a conventional configuration, it is not necessary to heat the washing water for a long time as in the case of heating up to a predetermined temperature, the power consumption is reduced, and the safety measures against the leakage of the heater are strict. Although there is a merit that does not need to be carried out, the energy given in heating the laundry cannot be used effectively.

  An object of the present invention is to solve the above-mentioned conventional problems and to provide a washing machine with improved washing performance and reduced washing time.

  In order to solve the above-described conventional problems, a washing machine of the present invention includes a rotating drum for storing laundry, a water receiving tank for storing the rotating drum, water supply means for supplying water into the water receiving tank, An air passage having water level detecting means for detecting the water level in the water receiving tank, water circulating means for discharging the wash water in the water receiving tank into the rotating drum, and heating means for introducing warm air into the rotating drum And a driving means for driving the rotating drum, and a control means for controlling the washing process and the rinsing process by controlling the driving means, the water supply means, the water circulation means and the heating means, the control means comprising: For the drained and dehydrated laundry after the completion of the first washing step, a second washing step is performed by introducing warm air by the heating means and rotation of the rotating drum, and twice after the second washing step is completed. This will be done In the first rinse step in the Wei step performs a rinsing with water without an intermediate dehydration.

  Thus, the laundry is drained and dehydrated after the completion of the first washing step, so that the amount of water contained in the laundry is reduced. In the subsequent second washing step, hot air is introduced into the rotating drum. The temperature of the laundry is likely to rise with a small amount of heat. As a result, the dirt that adheres to the laundry in the washing process and is difficult to peel off becomes easier to peel off from the laundry due to “heat, detergent remaining in the laundry, stirring force of the rotating drum”, and thus the washing performance is improved. . Further, in the rinsing step after the second washing step, the first rinsing eliminates intermediate dehydration and performs only water supply stirring, so that the second washing step remaining in the laundry or the laundry is performed. Warm water heated in the water remains, and even if water for rinsing is supplied here, the temperature of the laundry will drop to near the temperature of the water supplied for rinsing due to the amount of heat held by the laundry, etc. Rather than being rinsed with warm water, it is accompanied by the effect of the detergent remaining in the laundry even during rinsing, so that rinsing and washing are performed at the same time, and this makes it easier for the laundry to peel off. Since it is efficiently removed from the laundry even during rinsing, the cleaning performance is greatly improved.

  The washing machine of the present invention can improve the washing performance in the washing process, reduce the washing time, and reduce the energy used.

Sectional drawing of the washing machine in Embodiment 1 of this invention Block circuit diagram of the washing machine in Embodiment 1 of the present invention The time chart which shows the operation | movement of the washing process and the rinse process of the washing machine in Embodiment 1 of this invention

  A washing machine according to a first aspect of the present invention is a rotating drum for storing laundry, a water receiving tank for storing the rotating drum, a water supply means for supplying water into the water receiving tank, and a water level in the water receiving tank. Water level detecting means, water circulation means for discharging wash water in the water receiving tank into the rotating drum, an air passage having heating means for introducing warm air into the rotating drum, and driving the rotating drum And a control means for controlling the washing process and the rinsing process by controlling the driving means, the driving means, the water supply means, the water circulation means, and the heating means, and the control means is a waste water after completion of the first washing process. In the rinsing step, the second washing step is performed by introducing hot air by the heating means and the rotation of the rotating drum, and after the second washing step is completed, Second soot In step performs a rinsing with water without an intermediate dehydration.

  Thus, the laundry is drained and dehydrated after the completion of the first washing step, so that the amount of water contained in the laundry is reduced. In the subsequent second washing step, hot air is introduced into the rotating drum. The temperature of the laundry is likely to rise with a small amount of heat. As a result, the dirt that adheres to the laundry in the washing process and is difficult to peel off becomes easier to peel off from the laundry due to “heat, detergent remaining in the laundry, stirring force of the rotating drum”, and thus the washing performance is improved. . Further, in the rinsing step after the second washing step, the first rinsing eliminates intermediate dehydration and performs only water supply stirring, so that the second washing step remaining in the laundry or the laundry is performed. Warm water heated in the water remains, and even if water for rinsing is supplied here, the temperature of the laundry will drop to near the temperature of the water supplied for rinsing due to the amount of heat held by the laundry, etc. Rather than being rinsed with warm water, it is accompanied by the effect of the detergent remaining in the laundry even during rinsing, so that rinsing and washing are performed at the same time, and this makes it easier for the laundry to peel off. Since it is efficiently removed from the laundry even during rinsing, the cleaning performance is greatly improved.

  In the second invention, immediately after the completion of the second washing step, drainage is not performed but only water supply is performed. Thereby, in addition to the effect of 1st invention, since the washing water warmed by the 2nd washing process remains in a washing machine, the temperature of a rinse water becomes higher and the washing performance improves more. .

  3rd invention adds the time substantially equivalent to the time which the intermediate | middle dehydration which abbreviate | omitted to the feed water stirring process of the 2nd rinse process. As a result, the agitation time in the second rinsing step is prolonged, so that the washing and rinsing effects in the second rinsing step are both improved, so that the washing performance is further improved and the rinsing performance is also improved. The effect that the amount of remaining detergent can be reduced more is acquired. Furthermore, the effect that washing can be performed without changing the washing time is also obtained.

  4th invention adds the time substantially equivalent to the time which the intermediate | middle dehydration which abbreviate | omitted to the feed water stirring process of the 1st rinse process. As a result, the agitation time of the first rinsing step becomes longer, so that both washing and rinsing effects in the second rinsing step are improved, so that the washing performance is further improved and the rinsing performance is also improved. The effect that the amount of remaining detergent can be reduced more is acquired. Furthermore, the effect that washing can be performed without changing the washing time is also obtained. In the first rinsing process and the second rinsing process, the detergent concentration is higher in the first rinsing process, so the first rinsing process discharges the detergent from the laundry at the same amount of water and rinsing time. Since the effect is high, the effect of further improving the rinsing performance can be obtained.

  5th invention adds the time substantially equivalent to the time which the intermediate | middle dehydration which abbreviate | omitted to the feed water stirring process of the 1st time and the 2nd rinse process. As a result, since the stirring time for rinsing becomes longer, both the washing effect and the rinsing effect are improved, so that the washing performance is improved and the rinsing performance is also improved, so that the amount of detergent remaining in the laundry can be further reduced. An effect is obtained. Furthermore, the effect that washing can be performed without changing the washing time is also obtained. Also, since the first rinsing process has a higher detergent concentration than the second rinsing process, the first rinsing process has a higher effect of discharging the detergent than laundry in the same amount of water and rinsing time. Since the softening agent is used in the second rinsing step, the softening agent is more easily dispersed in the laundry when the water supply stirring time in the second rinsing step is long. For this reason, by considering the time distribution of the first rinsing step and the second rinsing step, an effect of easily balancing the rinsing performance and the finished laundry after washing can be obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, the washing water used in the present invention is both a washing water used as a water containing a detergent component used in a washing process and a rinsing water used as a rinsing water as a rinse water used in a rinsing process. Is included. Further, the circulation shower means washing water discharged from the circulation path by driving the water circulation means.

(Embodiment 1)
1 is a cross-sectional view of a drum type washing machine according to Embodiment 1 of the present invention, FIG. 2 is a block circuit diagram of the drum type washing machine according to Embodiment 1 of the present invention, and FIG. 3 is an embodiment of the present invention. 6 is a time chart showing an operation of a washing process of the drum type washing machine in the first embodiment.

  1 to 3, a water receiving tub 2 is disposed inside a drum type washing machine 1. A rotating drum 3 as a washing tub is disposed inside the water receiving tub 2 so as to be rotatable by a horizontal rotating shaft. The rotating drum 3 is rotated by a motor 4 connected to the back surface. The rotating drum 3 is provided with a plurality of through holes on the outer peripheral surface, and several protrusion plates are provided on the inner wall surface. The rotating drum 3 also functions as a washing tub, a dewatering tub, and a drying tub.

  A water intake 5 is connected to the lowest part on the rear side of the water receiving tank 2. The water intake 5 is connected to a drain pipe 7 that is opened and closed by a drain valve 6. A circulation path 9 connected to the discharge port 8 for discharging the wash water taken in from the water intake port 5 to the rotary drum 3 communicates between the water intake port 5 and the drain valve 6. By driving the circulation pump 10, the wash water in the water receiving tank 2 passes through the circulation path 9 and is discharged to the rotary drum 3 as a circulation shower. Thus, circulating water can be applied to the laundry in the rotating drum 3. A water supply valve 11 is provided above the water receiving tank 2, and the water supply valve 11 supplies water into the water receiving tank 2. The water level detection means 12 detects the water level in the water receiving tank 2.

  The control device 13 has a control means 14 composed of a microcomputer, and controls the operation of the motor 4, drain valve 6, circulation pump 10, water supply valve 11 and the like via the power switching means 15, washing, rinsing, A series of steps such as dehydration are sequentially controlled. The input setting means 16 sets a driving course or the like, and the control means 14 inputs information from the input setting means 16 and displays a display means 17 based on the information to notify the user. The storage means 18 stores data necessary for control by the control means 14. Reference numeral 19 denotes a commercial power source, and 20 denotes a power switch. Reference numeral 21 denotes a rotational speed detection means for detecting the rotational speed of the rotary drum 3. Information on the rotational speed detection means 21 is sent to the control means 14, and the control means 14 passes through the power switching means 15 to determine the rotational drum 3. Control the number of revolutions.

  The control means 14 controls the rotational speed of the rotating drum 3 via the power switching means 15 from the information of the rotational speed detecting means 21 that detects the rotational speed of the rotating drum 3. The air passage 22 is provided with a heater 23 (heating means) for heating the laundry, and the air passage 22 passes the air heated by the heater 21 through the air vent 24 provided in the water receiving tub 2. It becomes the composition which blows in. The heater 21 is controlled by the control means 14 in the same manner as the motor 4 and the like.

  When the user puts the laundry into the drum type washing machine 1 and presses the power switch 20, the input setting means 16 can input the washing course and the like. Based on the information from the input setting unit 16, the control unit 14 displays the display unit 17 to notify the user. When the user presses the laundry start button to start washing, the laundry weight detection step of the washing step is started.

  The laundry weight detection process is performed by detecting the magnitude of the current signal of the motor 4 when the motor 4 is controlled to rotate the rotating drum 3 together with the laundry. Further, the control unit 14 determines the amount of the detergent based on the result of the laundry amount determination, displays the display unit 17 to notify the user, and considers the time for the user to put in the detergent for a predetermined time (for example, 1 After a minute), the control means 14 starts to prepare for water supply.

  Next, the control means 14 opens the water supply valve 11 and starts water supply in order to start the washing process 1 (1st washing process). At this time, the supplied water passes through a detergent case (not shown) and is stored in the water receiving tank 2 together with the detergent put into the detergent case. At this time, the rotating drum 3 rotates in a fixed direction at about 50 r / min, the circulation pump 10 is driven, and the washing water in the water receiving tub 2 passes through the circulation path 9 and circulates in the rotating drum 3. Are discharged. When the control means 14 determines that the predetermined water level has been reached by the water level detection means 12, the water supply valve 11 is closed to stop water supply to the water receiving tank 2 and stop the circulation pump 10. Thereafter, the control unit 14 causes the rotating drum 3 to perform tumbling that rotates clockwise and counterclockwise about every 30 seconds, and further starts the operation of the circulation pump 10. 11 is opened, water supply is resumed, and water is supplied to a predetermined water level.

  In the tumbling of the rotating drum 3, the laundry in the rotating drum 3 is caught by a protruding plate (not shown) provided in the rotating drum 3 and lifted and dropped to be washed. In this tapping, the laundry preferably has a rotational speed that does not stick to the wall surface of the rotating drum 3 by centrifugal force so that the kinetic energy at the time of dropping is effectively applied to the laundry, and also depends on the amount of laundry. However, about 50 r / min is preferable. The rotation direction of the rotary drum 3 may be the same direction or periodically switched. At this time, the rotating drum 3 may be temporarily stopped.

  When the washing time has elapsed and the washing process 1 is completed, the control means 14 opens the drain valve 6 to start the washing process 2 (second washing process), and passes through the drain pipe 7 in the water receiving tank 2. Drain the wash water. When the drainage is completed, adjustment of the amount of water contained in the laundry is started in order to perform heating with warm air by the heater 23 in a state where the amount of water contained in the laundry is reduced. Since the adjustment of the amount of water uses dehydration, the control means 14 controls the balance of the rotary drum 3 and increases the rotational speed of the rotary drum 3. Specifically, since the moisture content of the laundry is assumed to be about twice the dry weight of the laundry, for example, the rotation speed of the rotary drum 3 is maintained at about 250 r / min for a predetermined time, and then the rotation is stopped. Let After stopping the rotation number of the rotating drum 3, the control means 14 starts tumbling for rotating the rotating drum 3 to the right and left about every 30 seconds at about 50 r / min and energizing the heater 23. From the air passage 22, for example, a wind of about 70 ° C. warmed by the heater 23 is blown into the rotating drum 3 through the air vent 24 provided in the water receiving tank 2. At this time, since the water in the water receiving tank 2 is small, the operation of the circulation pump 10 is stopped.

  When the tumbling of the rotating drum 3 and the blowing of the air warmed by the heater 23 are completed for a predetermined time, the control means 14 stops the energization, blowing and tumbling of the heater 23, and the washing process 2 ends, and the rinsing process 1 (First rinsing step) is entered. At the stage where this washing step 2 is completed, the temperature of the laundry has increased to about 40 ° C.

  In the rinsing process 1, when it is set that the rinsing is performed twice or more in the initial setting, the intermediate dehydration 1 in the first rinsing is not performed. The operation of the rinsing process 1 will be described. When the rinsing process 1 is started, the control unit 14 closes the water supply valve 11 and starts water supply. At this time, the supplied water passes through a detergent case (not shown) and is stored in the water receiving tank 2. The rotating drum 3 rotates in a fixed direction at about 50 r / min, the circulation pump 10 is driven, and the wash water in the water receiving tub 2 passes through the circulation path 9 and is discharged into the rotating drum 3 as a circulating shower. .

  When the control means 14 determines that the predetermined water level has been reached by the water level detection means 12, the water supply valve 11 is closed to stop the water supply to the water receiving tank 2 and to stop the operation of the circulation pump 10. The temperature of the laundry before starting the water supply was about 40 ° C., but only the water supply was performed without performing the intermediate dehydration 1. At this time, the amount of water supplied up to a predetermined water level is small because the intermediate dehydration 1 is not performed. Therefore, when the amount of laundry is, for example, 4.5 kg, the amount of water supplied is about 15 L, which is 5 to 6 L less than usual. Further, when the temperature of the water supplied at this time is 20 ° C., the temperature of the laundry is lower than 40 ° C., but when the room temperature is 23 ° C., the temperature is maintained at 27-30 ° C. Agitation is performed.

  Usually, the water supply / stirring time in the rinsing process 1 after the completion of the intermediate dehydration 1 is about 2 to 3 minutes, but the time required for the intermediate dehydration is 3 to 4 minutes if the time required for washing is the same. Therefore, this time can be allocated to the water supply / stirring time in the rinsing step 1. For example, when the time for the intermediate dehydration 1 is assigned to the water supply / stirring time of the rinsing step 1, the water supply / stirring can be performed for 5 to 7 minutes. That is, as described above, the temperature of the laundry is 27 to 30 ° C., and the water supply stirring is performed for 5 to 7 minutes in a state where the circulation pump 10 is operated on and off. At this time, the temperature of the laundry is higher than the normal rinsing temperature, the amount of detergent remaining in the laundry is large, and the stirring time is also long. Laundry is also washed. In other words, there is more detergent than usual left in the laundry, and these laundry is stirred at a higher water temperature and for a longer time, so it cannot be removed in the washing step and adheres to the laundry. By removing the soiled components from the laundry during the rinsing step 1, an effect of greatly improving the cleaning performance can be obtained.

  When the control means 14 determines that a predetermined time has elapsed, the control means 14 determines that the rinsing process 1 has been completed, and the drain valve 6 is opened to move to the rinsing process 2 (second rinsing process). Drain the rinse water collected in 2. When the drainage is completed, the intermediate dehydration 2 of the rinsing process 2 is started, and the control means 14 rotates the rotating drum 3, and the rotational speed of the rotating drum 3 reaches 900 r / min which is a predetermined rotational speed through balance control. Up. By the intermediate dehydration 2, the washing water remaining in the laundry is discharged out of the drum type washing machine 1, and the washing water contained in the laundry is reduced. When the rotating drum 3 rotates at 900 r / min for a predetermined time, the control means 14 sends a signal to the motor 4 to stop the rotation of the rotating drum 3.

  After stopping the rotating drum 3, the control means 14 closes the water supply valve 11 and starts water supply. At this time, the supplied water passes through a detergent case (not shown) and is stored in the water receiving tank 2. The rotating drum 3 starts rotating in a fixed direction at 50 r / min, the circulation pump 10 is driven, and the washing water in the water receiving tub 2 passes through the circulation path 9 and is discharged into the rotating drum 3 as a circulating shower. The When the control means 14 determines that the predetermined water level has been reached by the water level detection means 12, the control means 14 closes the water supply valve 11 to stop water supply to the water receiving tank 2. When the control means 14 determines that the predetermined time has elapsed, the control means 14 determines that the rinsing step 2 has ended, and the control means 14 opens the drain valve 6 to drain the rinse water accumulated in the water receiving tank 2.

  When the drainage is completed, final dehydration is started, and the control unit 14 rotates the rotating drum 3 to increase the rotating speed of the rotating drum 3 to 900 r / min which is the final rotating speed through balance control. By this final dehydration, the washing water remaining in the laundry is discharged out of the drum type washing machine 1, and the washing water contained in the laundry is reduced. When the rotating drum 3 rotates at 900 r / min for a predetermined time, the control means 14 sends a signal to the motor 4 to stop the rotation of the rotating drum 3. When the rotating drum 3 is stopped, the washing is finished, and the control means 14 turns off the drum-type washing machine 1.

  As described above, in the washing step 2, drainage and dewatering are performed first, and the amount of water contained in the laundry is reduced. Therefore, the heater installed in the air passage 22 into the rotary drum 3. By introducing the warm air heated by 23, the temperature of the laundry easily rises with a small amount of heat. Washing performance because dirt that adheres to the laundry in the washing step 1 and is difficult to peel off is peeled off from the laundry in the washing step 2 by the heat of warm air, the detergent remaining in the laundry, and the stirring of the rotating drum. Will be improved. Further, in the rinsing process 1 after the washing process 2, since the intermediate dehydration 1 is eliminated and only the water supply stirring is performed, the warm water heated in the washing process 2 remains in the laundry or the drum type washing machine 1. Even if water for rinsing is supplied here, the temperature of the laundry does not decrease to near the temperature of the water supplied for rinsing due to the amount of heat held by the laundry or the drum-type washing machine 1, etc. Rinsing and agitation are carried out, so that the detergent remaining in the laundry even during the rinsing causes the rinsing and the washing to be performed at the same time. Since it is removed from the laundry, the cleaning performance is greatly improved.

  In addition, since the intermediate dehydration 1 is omitted at this time, if the entire washing time is not changed, the intermediate dehydration 1 time can be used for the rinsing agitation time. The effect which can aim at both the improvement of the washing | cleaning performance of a thing and the improvement of a rinse performance is acquired. Further, when this stirring time is used for rinsing, the rinsing 1 and the rinsing 2 have a higher detergent concentration in the rinsing 1, so that the rinsing 1 discharges the detergent from the laundry at the same amount of water and the same rinsing time. Since the effect is high, the effect of improving the rinsing performance can be obtained. Moreover, since the softener is used in the rinse 2, if this time is used for the stirring time of the rinse 2, the softener is more easily dispersed in the laundry, and the effect of improving the finish of the laundry after washing is obtained. It is done. Moreover, when this time is distributed to the stirring time of the rinse 1 and the rinse 2, the effect which can perform washing which balanced the two effects of the said rinse effect and the dispersion | distribution effect of a softening agent is acquired.

  In the present embodiment, the water receiving tank 2 and the rotating drum 3 are arranged horizontally, but the water receiving tank 2 and the rotating drum 3 may be inclined. Further, the amount of water supplied for the washing process 1 / rinse, the number of rotations of the rotary drum 3 for washing / dehydrating, etc. are not particularly specified.

  As described above, the washing machine according to the present invention includes a rotating drum for storing laundry, a water receiving tank for storing the rotating drum, water supply means for supplying water into the water receiving tank, and the water receiving tank. A water level detecting means for detecting the water level of the water, a water circulation means for discharging wash water in the water receiving tank into the rotating drum, an air passage having a heating means for introducing warm air into the rotating drum, and the rotating drum And a control means for controlling the water supply means, the water circulation means and the heating means to control the washing process, etc., the control means by draining and dehydrating after the completion of the first washing process. For the laundry whose water content has decreased, the second washing step is performed by introducing the warm air and the rotation of the rotating drum, and the first in the rinsing step that is performed twice or more after the completion of the second washing step. Rinse in the middle Is intended to perform water supply to rinsing without water, for the purpose or to improve detergency, or reduce the washing time, that saving energy in the washing.

DESCRIPTION OF SYMBOLS 1 Drum-type washing machine 2 Water receiving tank 3 Rotating drum 4 Motor (drive means)
5 Water intake 6 Drain valve 7 Drain pipe 8 Discharge port 9 Circulation route 10 Circulation pump (water circulation means)
11 Water supply valve (water supply means)
12 Water level detection means 14 Control means 23 Heating means

Claims (5)

A rotating drum for storing the laundry;
A water receiving tank that houses the rotating drum;
Water supply means for supplying water into the water receiving tank;
Water level detection means for detecting the water level in the water receiving tank;
Water circulation means for discharging wash water in the water receiving tank into the rotating drum;
An air passage having heating means for introducing warm air into the rotating drum;
A drive means for driving the rotating drum; and a control means for controlling the washing process and the rinsing process by controlling the drive means, the water supply means, the water circulation means and the heating means,
The control means performs a second washing process by introducing warm air by the heating means and rotation of the rotating drum on the drained and dehydrated laundry after the completion of the first washing process, and the second washing In the first rinsing step in the rinsing step that is performed twice or more after the completion of the step, the washing machine is characterized by supplying water without performing intermediate dehydration and rinsing. 2. The washing machine according to claim 1, wherein drainage is not performed immediately after completion of the second washing step, and only water supply is performed. The washing machine according to claim 1 or 2, wherein a time substantially equivalent to the omitted intermediate dehydration time is added to the water supply stirring step of the second rinsing step. 3. The washing machine according to claim 1, wherein a time substantially equivalent to the omitted intermediate dehydration time is added to the feed water stirring step of the first rinsing step. The washing machine according to claim 1 or 2, wherein a time substantially equivalent to the omitted intermediate dehydration time is added to the water supply stirring step of the first and second rinsing steps.

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