JP6399331B2 - Drum washing machine - Google Patents

Description

  The present invention relates to a drum type washing machine for washing clothes and the like.

  Conventionally, it has been considered that a drum-type washing machine of this type is provided with a darkening prevention course for improving the cleaning performance and preventing darkening of clothes and the like (for example, see Patent Documents 1 and 2).

  In the conventional drum-type washing machine described in Patent Document 1, when the darkening prevention course is selected, the water level corresponding to the amount of cloth detected by the cloth amount detecting means and approximately twice the amount of standard detergent corresponding to the water level. By displaying the amount of detergent, the washing performance is enhanced at a high detergent concentration to prevent darkening of clothing.

  In the conventional drum-type washing machine described in Patent Document 2, when the darkening prevention course is selected, after the amount of cloth is detected, the detergent is added to perform the pre-washing, and then the washing water used for the pre-washing is drained. In this case, the detergent is added again to perform the main washing, thereby improving the cleaning performance and preventing darkening of the clothes.

  In addition, an adsorbent that adsorbs sebum components is provided in the baffle of the rotating drum, and even when the amount of water during washing is small, sebum components washed out from clothing are adsorbed by the adsorbent, and yellowing and It is considered to suppress darkening (see, for example, Patent Document 3).

JP 2012-75505 A JP 2012-90829 A JP 2011-152247 A

  However, in the above-described conventional configuration, the washing power is increased and the amount of water used in the washing process is small, so that the concentration of dirt substances including the surfactant molecules removed from the clothing is around the laundry. The removed dirt is reattached to the clothing during the washing process. In addition, when the amount of washing water is small, dirt substances adhere to the clothes again due to the drainage after the washing process, and in the intermediate dehydration process in which the drum is rotated at high speed, depending on the kind of dirt, it adheres to the clothes surface. When the soiled dirt enters the interior of the fabric with the washing water, the dirt remains on the clothing even after the washing is finished, and there is a problem that the clothing becomes dark or yellows over time due to repeated washing. . In addition, when the adsorbent is used, maintenance such as replacement is necessary, and there is a problem that the usability is poor.

  The present invention solves the above-mentioned conventional problems, and it is detached from the clothing, which occurs because the concentration of dirt around the laundry is increased by reducing the amount of water during the washing process by saving water and increasing the cleaning power. An object of the present invention is to provide a drum type washing machine that suppresses redeposition of dirt and reduces blackening and yellowing of clothes after washing.

In order to solve the above-described conventional problems, a drum type washing machine of the present invention includes a drum rotatably provided in a water tub, a motor that rotationally drives the drum, and water supply means for supplying washing water into the water tub. And a drainage means for draining the washing water in the water tank and a control means for sequentially controlling each of the washing, rinsing and dewatering steps, wherein the control means is configured to wash the washing water in which the detergent is dissolved in the washing process. Supplying water, removing dirt from the clothes while rotating the drum , and draining after the first step, after the first step, fresh water was supplied without dehydration and removed in the first step A second step of moving the dirt of clothes to fresh water, and draining the washing water that has moved dirt of clothes in the second step, and then supplying the washing water in which the detergent is dissolved, and the drum 3rd process of removing dirt of clothes while rotating , After the third step, the water and water supply, running and rinsing step performs rinsing while rotating the drum, rotational speed of the drum in the second step than the rotational speed of the drum in the rinsing step Is also a low rotation .

  Thereby, by adding detergent in the first step and removing dirt from the clothes, the concentration of dirt in the washing water contained in the clothes and the washing water around the clothes is increased, but in the second step The dirt adsorbed in and on the clothes can be moved from the clothes into the wash water that does not contain the newly supplied detergent, and the detergent is added again in the third step to By removing dirt that could not be removed in the process, it is possible to achieve high cleaning performance while suppressing reattachment of dirt to clothing. In addition, by dividing the washing time with the detergent into the first step and the third step, the time for washing clothes with a high concentration of dirt in the washing water is shortened, so that the dirt substance is reduced. The frequency of contact with clothing is reduced, and it becomes possible to suppress and reduce the reattachment of dirt substances to clothing. Accordingly, it is possible to reduce residual stains on the clothing after the washing process and reduce darkening and yellowing even after repeated washing.

  The drum type washing machine of the present invention can suppress redeposition of dirt detached from clothing and reduce darkness and yellowing of clothing after washing.

1 is a schematic configuration diagram of a drum type washing machine according to a first embodiment of the present invention. Block diagram of the drum type washing machine Time chart showing the operation of the drum type washing machine (A) (b) Operation | movement explanatory drawing in the 2nd process of the drum type washing machine Operation explanatory diagram of another example in the second step of the drum type washing machine Time chart showing the operation of the drum type washing machine of the second embodiment of the present invention

The drum type washing machine of the present invention includes a drum rotatably provided in a water tub, a motor for rotationally driving the drum, water supply means for supplying wash water into the water tub, and draining the wash water in the water tub. Draining means, and control means for sequentially controlling each step of washing, rinsing, and dewatering, and the control means supplies washing water in which the detergent is dissolved in the washing process, and rotates the drum while rotating the drum. The first step of removing dirt and draining the water , and after the first step, without dehydration , supply fresh water and move to the fresh water supplied with the dirt of the clothing removed in the first step a second step of draining after being, after said second step, a third step of the washing water dissolving the detergent and water to remove clothing dirt while rotating the drum, the first After step 3, feed water and rotate the drum. Run a rinsing step performs rinsing, rotation speed of the drum in the second step is to a low rotation than the rotation speed of the drum in the rinsing step.

By performing the second step of supplying water and moving the dirt on the clothes to the washing water after the dirt concentration in the washing water is increased by the dirt being knocked out from the clothes by the detergent in the first step. , Preventing the washed-out dirt from being reattached to the clothes, and removing the dirt left after washing with the detergent in the third step into the washing water, improving the washing performance and washing It is possible to suppress the reattachment of the dirty dirt to the clothing. In particular, in the second step in which the detergent is not newly added, in the state where the washing water and the clothes in which the dirt components separated from the clothes by the detergent component or the mechanical force by stirring are dispersed are mixed, It is possible to dilute the washing water in the vicinity of the clothing by supplying water, physically separate the soil components from the clothing as much as possible, and further reduce the concentration of the soil components to reduce the probability of reattaching on the clothing. It becomes. In addition, when the stain concentration in the washing water is high, reattachment to the clothing is likely to occur. Therefore, in the present invention, the washing time is divided and the washing time in a dark stain concentration environment is shortened, thereby It is possible to suppress darkening at the time of re-adhesion and repeated washing.

  In the above configuration, the control means may perform a draining step of draining the washing water in the water tank after supplying water and stirring in the first step.

  As a result, the washing water whose stain concentration has increased with the progress of the first step of the washing step is drained out of the machine, and fresh water is newly introduced into the aquarium, so that the washing water having a low stain concentration is introduced. The second step can be executed under the environment. Therefore, in the second step, the dirt remaining on the surface of the clothes and the dirt adsorbed on the clothes again due to reattachment are more easily moved to clean washing water. Further, in the third step, it becomes possible to wash away the stains on the clothes left unwashed in the first step while suppressing reattachment, and once again the dirt substances removed from the clothes in the washing step are reattached to the clothes. The washing performance is improved while reducing, and it is possible to reduce the darkness and yellowing of the clothes even after repeated washing.

  In the above-mentioned configuration, the control means is configured so that, in the first step and the third step in which the detergent is introduced and washed, the amount of detergent introduced in the first step is greater than the amount of detergent introduced in the third step. You may make it increase.

  As a result, in the state at the start of washing where the amount of dirt is large and the dirt is firmly attached to the clothes, it becomes possible to actively wash the dirt from the clothes into the washing water with a large amount of detergent. Then, since the stains remaining on the clothing after the first step and the second step are targeted for washing off, by making the amount less than the amount of detergent used in the first step, the occurrence of abnormal bubbles Can be prevented.

  The said structure WHEREIN: You may make it the said control means make the water supply amount in a said 2nd process larger than the water supply amount in a said 1st process.

  As a result, the dirt substance remaining on the surface of the clothes can easily move from the clothes to the washing water side, and the reattachment of the dirt substances from the washing water side onto the clothes can be suppressed.

In the above configuration, a circulation pump for feeding the washing water in the water tank into the drum,
A circulating water passage for discharging the washing water in the water tub into the drum by the circulation pump; in the second step, the circulation pump is driven while the drum is driven, and the washing water is poured into the drum; You may make it discharge.

  This makes it possible to quickly move dirt substances adhering to clothing to the washing water side, reduce reattachment to clothing, and reduce darkness and yellowing of clothing even after repeated washing. It becomes possible to do.

  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.

(Embodiment 1)
FIG. 1 is a schematic configuration diagram of a drum type washing machine according to a first embodiment of the present invention, FIG. 2 is a block configuration diagram of the drum type washing machine, and FIG. 3 shows an operation of the drum type washing machine. 4A and 4B are operation explanatory diagrams in the second step of the drum type washing machine.

  1 to 4, a water tank 3 elastically supported by a damper 2 or the like is provided in a housing 1. A cylindrical drum 4 with a bottom is rotatably provided in the water tank 3, and the rotation shaft 4a is inclined upward at an angle θ (for example, 5 to 20 degrees).

  A plurality of baffles 5 projecting inward toward the rotation center of the drum 4 in the direction of the rotation axis 4a and a large number of small holes 6 communicating with the inside of the water tank 3 are provided on the inner peripheral side surface of the drum 4. On the side, an opening 7 for taking in and out laundry such as clothes is provided. A balancer 8 is provided around the opening 7 to reduce vibrations caused by the bias of the laundry when the drum 4 rotates. The balancer 8 is formed in an annular shape so as to surround the opening 7.

  A motor 9 that rotationally drives the drum 4 is attached to the rear surface of the water tank 3. The motor 9 is constituted by a brushless DC motor, and the rotation speed can be freely changed by inverter control.

  A water supply valve (water supply means) 10 for supplying washing water into the water tank 3 is provided in the water supply pipe 11. Washing water passes through a water supply path 13 through a detergent case 12 into which a detergent provided in a water supply pipe 11 is poured, and is supplied into the water tank 3 from a water supply port 14. Washing water supplied into the water tank 3 flows into the drum 4 through the small holes 6. The water supply port 14 is provided at an outlet portion where one end of the water supply path 13 is connected to the rear upper surface of the water tank 3, and communicates with the inside of the water tank 3 at the rear part of the drum 4.

  A drainage valve (drainage means) 15 for draining the washing water in the water tank 3 is provided in the drainage path 16. The drainage path 16 is connected in parallel with the drainage port 17 provided at the bottom of the water tank 3 and the water stop valve 18, and when draining, the washing water in the water tank 3 is passed from the drainage port 17 through the drainage path 16 and the drainage valve 15. It is trying to discharge outside the machine.

  A circulation pump 19 for feeding the washing water in the water tank 3 into the drum 4 and a circulation water channel 20 for discharging the washing water in the water tank 3 into the drum 4 through the circulation pump 19 are provided. One end of the circulation channel 20 is connected to the drain port 17 through the water stop valve 18, and the other end is connected to the discharge port 21 facing the opening 7 through the lower part of the water tank 3.

  When the circulation pump 19 is driven and the washing water in the water tank 3 is fed into the drum 4, the drainage valve 15 is closed and the water stop valve 18 is opened to pressurize the washing water. It can be discharged into the drum 4 from the discharge port 21 through the drainage path 16, the water stop valve 18, and the circulation pump 19, and can be circulated.

  The control means 22 provided in the upper front part in the housing 1 drives the motor 9, the water supply valve 10, the drain valve 15, etc., and sequentially controls each process such as washing, rinsing and dehydration. The control means 22 includes an output of the cloth amount detection means 23 for detecting the amount of laundry put into the drum 4, an output of the water level detection means 24 for detecting the amount of washing water supplied into the water tank 3, and The output of the rotation detecting means 25 for detecting the driving of the drum 4 is input.

  Note that the laundry can be taken in and out through the opening 7 provided on the front side of the drum 4 by opening the openable door 26 provided on the front surface of the housing 1.

  About the drum type washing machine comprised as mentioned above, the operation | movement and an effect | action are demonstrated below. Washing is sequentially performed in the order of a washing step, an intermediate dehydration step, a rinsing step 1, a rinsing step 2, and a final dehydration step. The washing step includes a first step of removing stains on the clothes with the wash water in which the detergent is dissolved, a second step of supplying clean water not containing the detergent and moving the stains on the clothes to the wash water, and a detergent. This is performed in the order of the third step of removing stains on the clothes with the dissolved washing water.

  First, the door 26 that can be freely opened and closed is opened on the front side of the housing 1, the laundry is put into the drum 4 from the opening 7, and the power switch of the operation display unit 27 provided on the front upper surface of the housing 1. (Not shown) is turned on, and a start switch (not shown) is operated to start operation.

  By the start of operation, the first step of the washing step is first executed. In a 1st process, it is performed in order of cloth amount detection, water supply, and tap washing. The amount of laundry put in the drum 4 is detected by the cloth amount detecting means 23. The amount of laundry can be detected from the amount of torque applied to the motor 9 when the drum 4 rotates and the current value of the motor 9 when the drum 4 rotates.

  The control means 22 sets the time for each step such as washing, rinsing and dehydration according to the detected amount of laundry, determines the amount of detergent set according to the amount of laundry, and operates the guideline It is displayed on the display unit 27. The user puts the detergent into the detergent case 12 according to the displayed guideline for the amount of detergent. In addition, the detergent may be manually provided by a user or provided with a general automatic detergent introduction device.

  Next, a predetermined amount of water is supplied according to the amount of laundry detected by the cloth amount detection means 23 (for example, three levels of large, medium, and small). The amount of water (water level) supplied in the first step is L1, as shown in Table 1, W3 (for example, 28L) when “many”, W2 (for example, 22L) when “medium”, When “low”, it is W1 (for example, 18L).

  Washing water that enters the detergent case 12 from the opened water supply valve 10 through the water supply pipe 11 dissolves the detergent in the detergent case 12, flows through the water supply path 13, and is provided on the rear side of the drum 4. 14 is supplied into the water tank 3. Washing water collected at the bottom of the water tank 3 flows into the drum 4 through the small holes 6. At this time, the drain valve 15 and the water stop valve 18 are closed.

  The washing water accumulated in the water tank 3 is detected by the water level detection means 24, and when a predetermined amount of washing water is supplied, the water supply valve 10 is closed. The drum 4 is driven to rotate forward and reverse alternately every predetermined time at a rotation speed at which the laundry is beaten by the motor 9, for example, 45 rpm, and executes the first step.

  In the tapping washing, after the laundry is lifted in the rotation direction of the drum 4 by the baffle 5, the laundry falls from the upper part in the drum 4 and is struck against the clothes remaining on the bottom surface of the drum 4 or the bottom of the drum 4. In addition to the chemical power of the detergent, cleaning is performed by the mechanical power. The washing time (T1) is, for example, about 10 minutes.

In the first step, the water stop valve 18 is opened with the drain valve 15 closed, and the circulation pump 19 is driven. The washing water in the water tank 3 passes through the drainage passage 16, the water stop valve 18, and the circulation pump 19 from the drainage port 17, and is discharged and circulated into the drum 4 from the discharge port 21 through the circulation channel 20. By causing the washing water pressurized by the circulation pump 19 to be discharged from the discharge port 21 toward the clothes in the drum 4, the contact time between the clothes and the washing water can be lengthened and the cleaning power can be increased. The circulation pump 19 may be driven continuously or intermittently.

  The drum-type washing machine has a great cleaning effect due to the mechanical force at the time of tapping washing, so if there is too much water, it will fall to the water surface where the water level becomes high, and the collision energy at the time of falling will improve the washing performance In doing so, it is disadvantageous. Accordingly, the amount of water (water level) supplied in the first step is about L1, as shown in FIG. 4A, and the lower part of the clothing is immersed.

  When the first step is completed, drainage is subsequently performed. After the washing water used in the first step is drained, the second step of the washing step is executed. The second step is a step of moving the dirt washed and washed in the first step to the washing water side away from the clothes.

  Water supply in the second step is performed in the water tank 3 from the water supply port 14 provided on the rear side of the drum 4 through the water supply pipe 11, the detergent case 12, and the water supply path 13 from the water supply valve 10 as in the washing step. To be supplied. There is no detergent in the detergent case 12 and only water is supplied. In the second step, water is supplied up to the water level L2, washing water having a high concentration of dirt substances existing around the clothes is diluted, and the concentration of dirt substances around the clothes is reduced.

  The amount of water supplied in the second step of moving the dirt substance to the washing water is set in advance according to the amount of laundry detected by the cloth amount detection means 23 (for example, three levels of large, medium, and small). Yes. The greater the amount of water (water level) supplied in the second step, the lower the concentration of the dirt substance, which is advantageous. Therefore, as shown in Table 1, it is L2, and the water level L1 of the first step is It is set to 1.5 to 2 times. Specifically, W6 (for example, 42 to 56 L) for “many”, W5 (for example, 33 to 44 L) for “medium”, and W4 (for example, 27 to 36 L) for “low”. is there.

  As a result, the washing water containing a large amount of dirt substances remaining on the clothes in the water tank 3 or around the clothes can be newly supplied to L2 as shown in FIG. 4A. Move to clean water and dilute. The amount of fresh water supplied is such that clothing in the aquarium 3 is stationary, most of which is located below the surface of the water and soaked in washing water, and the clothing may be partially exposed from the water surface, Alternatively, the drum 4 may be exposed from the water surface by rotation.

  In the second step, the drum 4 is driven so that the position of the laundry is changed in the drum 4. Specifically, as shown in FIG. 4B, when the drum 4 is rotated in the direction of arrow A, the laundry moves so as to be lifted in the direction of arrow A by the baffle 5. At this time, the laundry is lumped in the direction of arrow B from the inner peripheral wall surface of the drum 4 obliquely downward without being exposed from the surface of the washing water supplied up to L2 and being lifted up to the upper part of the drum 4. The drum 4 is rotationally driven at such a speed that it collapses (for example, 35 rpm). The driving time T2 of the drum 4 is 1 minute, for example.

  Accordingly, the clothes overlapping in the drum 4 are separated in the washing water in which the dirt substance is diluted by supplying fresh clean water, and the washing water containing the dirt component between the clothes and the clothes fiber is separated. Can be quickly diffused throughout the washing water, and the dirt washed in the first step of the laundry can be effectively moved.

  Further, the driving of the drum 4 in the second step is performed after finishing the supply of the washing water into the water tank 3. As a result, in the water supply process, the soil components in the vicinity of the clothing that have slowly spread out are agitated at once with the wash water in which the soil substances have been diluted by the supply of new water, and the diffusion to the entire wash water is reduced for a short time The dirt washed in the first step that the laundry has can be effectively moved to the diluted washing water.

  When the driving time T2 of the predetermined drum 4 elapses in the second process, the process proceeds to the draining process. After the drainage of the washing water used in the second step, the third step of the washing step in which the washing is performed again using the detergent is executed.

  In the third step, similarly to the first step, a predetermined amount of water is set according to the amount of laundry detected by the cloth amount detecting means 23 (for example, three stages of large, medium, and small). Water is supplied. As shown in Table 1, the amount of water (water level) supplied in the third washing step is L1 as in the first step. When “high”, W3 (for example, 28 L), when “medium” Is W2 (for example, 22L), and “low” is W1 (for example, 18L).

  Washing water that has entered the detergent case 12 from the water supply valve 10 through the water supply pipe 11 dissolves the detergent in the detergent case 12 and flows through the water supply path 13, and from the water supply port 14 provided on the rear side of the drum 4 3 is supplied. Washing water collected at the bottom of the water tank 3 flows into the drum 4 through the small holes 6. At this time, the drain valve 15 is closed.

  The detergent to be newly used needs to be put in the detergent case 12 by the time the third step is started, and the amount of detergent to be put in the first step and the third step at the start of the washing operation is determined. Displayed on the operation display unit 27. For example, the detergent case 12 is provided with a plurality of detergent loading locations, and the indicated amount of detergent is placed in each loading location. The water channel flowing through the detergent case 12 is switched by a switching valve (not shown) or the like so that a predetermined amount of detergent is supplied when water is supplied in each process.

  Moreover, it may be thrown into the same place as the first step immediately before the third step is started. The amount of detergent to be introduced is preferably set to be less than the amount of detergent introduced in the first step, because some of the dirt substances are removed from the clothing in the first step.

  The washing water accumulated in the water tank 3 is detected by the water level detection means 24, and when a predetermined amount of washing water is supplied as in the first step, the water supply valve 10 is closed. The drum 4 is driven to rotate forward and reverse alternately every predetermined time at a rotational speed at which the laundry is beaten and washed by the motor 9, for example, 45 rpm, and executes the washing process.

  The tapping time (T3) in the third step is, for example, about 10 minutes. In the third step, it is also preferable to drive the circulation pump 19 and perform washing while discharging the wash water onto the clothes. In this case, the drain valve 15 is closed as in the first step. In this state, the water stop valve 18 is opened to drive the circulation pump 19, and the washing water in the water tank 3 is guided from the drain port 17 to the circulation water channel 20 through the drainage path 16 and the water stop valve 18, and is added by the circulation pump 19. By discharging the pressed washing water toward the clothes in the drum 4 from the discharge port 21, the contact time between the clothes and the washing water can be lengthened and the cleaning power can be increased. The driving of the circulation pump 19 may be continuous or intermittent.

  When the drive time T3 of the predetermined drum 4 elapses in the third step, the process proceeds to the intermediate dehydration step. The drain valve 15 is opened, the washing water in the water tank 3 is discharged, and the drum 4 is rotationally driven at a high speed (for example, 600 rpm). Following the intermediate dehydration step, the rinsing step is performed a plurality of times (for example, twice).

  In the rinsing step, the drum 4 is rotationally driven in the same manner as in the first step. The driving time T4 in the rinsing step 1 and the driving time T5 in the rinsing step 2 are each about 3 minutes, for example. The water level is L1. Even in the rinsing process, the circulation pump 19 is driven, and the rinsing water is discharged toward the clothes in the drum 4, thereby enhancing the rinsing effect. Finally, a final dehydration step is performed to finish washing.

  In the case of a laundry dryer having a drying function, a drying operation for drying the washed laundry can be executed following the washing operation.

  FIG. 5 shows the operation of another example of the drum 4 in the second step. The drum 4 is driven in the reverse direction so that the laundry in the drum 4 swings at the bottom of the drum 4. It is a thing. Specifically, the drum 4 is rotated by a predetermined angle θ1 (for example, 30 degrees) in the direction of arrow B, and then the drum 4 is reversed by a predetermined angle θ2 (for example, 30 degrees) in the direction of arrow C. . If the interval between forward and reverse inversion driving is set to a short time (for example, 60 reciprocations / min), the laundry can be vigorously swung at the bottom of the drum 4.

  Thereby, the wash water containing the dirt component between the clothes and the clothes fibers can be quickly diffused to the entire wash water, and the first step in which the laundry is held in newly supplied clean water The dirt washed in can be moved effectively.

  As described above, in the present embodiment, the drum 4 that is rotatably provided in the water tank 3, the motor 9 that rotationally drives the drum 4, the water supply means 10 that supplies the washing water to the water tank 3, and the water tank 3 is provided with a drainage means 15 for draining the wash water and a control means 22 for sequentially controlling each process such as washing, rinsing and dehydration. The control means 22 supplies the washing water in which the detergent is dissolved in the washing process. A first step of supplying water and removing dirt on the clothing while rotating the drum 4; a second step of supplying fresh water and moving the dirt on the clothing removed in the first step to the supplied fresh water; After draining the washing water that has moved the dirt of the clothes in the second step, the third process of supplying the washing water in which the detergent is dissolved and rotating the drum 4 to remove the dirt of the clothes is executed. The washing process is beaten with a detergent. The first and third steps of washing, and the first and third steps are performed by supplying clean water without using a detergent and newly supplying dirt substances adhering to clothing. By performing the second step of diffusing into fresh water, after the completion of the first step, it is present in the vicinity of the clothing separated from the clothing by the chemical force of the detergent components and the mechanical force of stirring and tapping. Dilute washing water with a high concentration of soiling substances with newly supplied water to reduce the concentration of soiling substances around clothing, and physically separate the soiling components from clothing, so that soiling substances can be taken out of the machine. Can be discharged. Further, in the subsequent third step, the dirt remaining on the clothing is removed again by tapping and washing, so that the washing performance is improved and the washed-out dirt is prevented from reattaching to the clothing. Dirt is reduced, and darkening and yellowing can be reduced even after repeated washing.

(Embodiment 2)
FIG. 6 is a time chart showing the operation of the drum type washing machine in the second embodiment of the present invention. The feature of the present embodiment is that the washing water is supplied into the aquarium 3 in the second step of diffusing dirt substances on the clothing or in the vicinity of the clothing into clean water while newly supplying water without using a detergent. The drum 4 is driven after the start, and the circulation pump 19 is driven so that washing water is discharged into the drum 4. Other configurations are the same as those of the first embodiment, the same reference numerals are given to the same configurations, and the detailed description of the first embodiment is used.

  In FIG. 6, after the washing water used in the first step is drained, the second step is executed. The water supply in the second step is the same as in the first step, through the water supply pipe 11, the detergent case 12, and the water supply path 13 from the water supply valve 10 to the water tank from the water supply port 14 provided on the rear side of the drum 4. 3 is supplied. There is no detergent in the detergent case 12 and only water is supplied.

  In the second step, water is supplied up to the water level L2, the washing water having a high concentration of dirt substances remaining in the clothes and the clothes remaining at the time of draining is diffused into the freshly supplied clean water, Reduce the concentration of soiling substances.

  The drum 4 is driven in the second step after the start of the supply of the washing water into the water tank 3. The driving time T6 of the drum 4 is, for example, 2 minutes. Note that the timing of driving the drum 4 may be the same as the start of water supply, or may be driven after a predetermined time delay. Essentially, the laundry is added to clean water newly supplied. It is only necessary that the dirt once separated from the clothing in the first step can be moved.

  Alternatively, the drum 4 may be driven at a speed at which the laundry moving in the rotation direction of the drum 4 collapses, and the laundry in the drum 4 is shaken at the bottom of the drum 4. You may make it move. In short, the position of the laundry only needs to be changed in the washing water.

  Further, in the second step, the circulation pump 19 is driven and the washing water is discharged into the drum 4 while the drum 4 is driven, so that it is effective for the laundry whose position is switched by the driving of the drum 4. It can be brought into contact with water, and dirt substances adhering to clothing can be quickly moved to the washing water side.

  According to the above configuration, the clothes are separated from each other while the position of the clothes overlapping the bottom of the drum 4 is switched or rolled after the water supply is performed, and the newly exposed clothes surface and the clothes fibers are separated. It is possible to diffuse and dilute the dirt adhering between them, and further the dirt dissolved in the washing water existing in the vicinity of the clothes into clean water newly added by water supply.

  In addition, a third step of removing residual dirt caused by redeposition on clothes by removing the diluted dirt component quickly by drainage, and washing again with a detergent. In order to remove dirt that could not be washed away in the first step, it is possible to achieve high washing performance while shortening the washing time in the washing water in which the dirt substance is present at a high concentration. Even after repeated washing, the darkness and yellowing of clothing can be reduced.

  As described above, the drum-type washing machine according to the present invention is useful as a drum-type washing machine because it can suppress redeposition of dirt detached from clothing and reduce blackening and yellowing of clothing after washing. It is.

3 Water tank 4 Drum 9 Motor 10 Water supply valve (Water supply means)
15 Drain valve (drainage means)
19 Circulating pump 20 Circulating water channel 22 Control means

Claims (5)

A drum rotatably provided in the water tank;
A motor for rotationally driving the drum;
Water supply means for supplying washing water into the water tank;
Drainage means for draining the wash water in the water tank;
Control means for sequentially controlling each step of washing, rinsing and dehydration,
The control means includes
A first step of supplying washing water in which a detergent is dissolved in the washing step, removing dirt from clothes while rotating the drum , and draining ;
After the first step, without dehydrating , the second step of supplying fresh water, moving the dirt of the clothing removed in the first step to the supplied fresh water, and then draining it;
After the second step, a third step of supplying washing water in which a detergent is dissolved and removing dirt on clothes while rotating the drum;
After the third step, a rinsing step of supplying water and rinsing while rotating the drum ;
The drum-type washing machine is configured such that the rotation speed of the drum in the second step is lower than the rotation speed of the drum in the rinsing step . The drum type washing machine according to claim 1, wherein the control means executes a draining step of draining the washing water in the water tank after supplying water and stirring in the first step. In the first step and the third step in which the detergent is introduced and washed, the control means is configured to increase the amount of detergent to be introduced in the first step more than the amount of detergent to be introduced in the third step. The drum type washing machine according to claim 1 or 2. The drum type washing machine according to any one of claims 1 to 3, wherein the control means is configured to make the amount of water supplied in the second step larger than the amount of water supplied in the first step. A circulation pump for feeding washing water in the water tank into the drum;
A circulating water passage for discharging the washing water in the water tub into the drum by the circulation pump; in the second step, the circulation pump is driven while the drum is driven, and the washing water is poured into the drum; The drum type washing machine according to any one of claims 1 to 4, wherein the drum type washing machine is discharged.

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