JP2015156993A - Drum type washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce blackening of clothing after washing by suppressing reattachment of dirt detached from the clothing.SOLUTION: A drum type washing machine includes: a rotary drum 3 rotatably provided in a water receiving tub 2; driving means 7 for rotationally driving the rotary drum 3; water supply means 8 for supplying washing water to the water receiving tub 2; drainage means 11 for draining the washing water in the water receiving tub 2; an overflow hole 16 for discharging the water exceeding a water level which the water receiving tub 2 can store; water level detection means 18 for detecting the water level in the water receiving tub 2; and control means 20 for controlling each step of washing, rinsing, dewatering, and the like. When a blackening suppression course is set, in the washing step, the washing water in the water receiving tub 2 is drained in washing time which is shorter than predetermined washing time in a standard course, and equal to or greater than half the predetermined washing time. After that, a step of supplying new washing water to the overflow hole 16, agitating, and draining is repeated at least equal to or more than two times.

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).

JP2012-077555 JP 2012-090829 A JP 2011-152247 A

  However, in the conventional configuration, the cleaning power is increased and the amount of water used in the washing process is small, so that the concentration of the soil substance including the surfactant molecules removed from the clothes is around the laundry clothes. And the removed dirt adheres to the clothing again 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 an adsorbent is used, there is a problem that maintenance such as replacement is necessary and usability is poor.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object of the present invention is to provide a drum-type washing machine that suppresses redeposition of dirt detached from clothing and reduces darkening of clothing after washing.

In order to solve the above-described conventional problems, a drum-type washing machine of the present invention includes a rotating drum that is rotatably provided in a water receiving tub, a driving unit that rotationally drives the rotating drum, and a water receiving tub. Water supply means for supplying wash water, drain means for draining wash water in the water receiving tub, overflow hole for discharging water exceeding the water level that can be stored in the water receiving tub, and in the water receiving tank A water level detecting means for detecting the water level, and a control means for controlling each process such as washing, rinsing and dehydration. After the washing time shorter than the washing time has elapsed, the washing water in the water receiving tub is drained, and then the process of supplying new washing water to the vicinity of the overflow hole, stirring, and draining is repeated at least twice. As a result, the washing water containing a lot of dirt is drained in a shorter time than the predetermined washing time, the contact time between the dirty washing water and the clothes is shortened, and the dirt remaining on the clothes can be stored in the water receiving tank. It can be discharged into a large amount of washing water, and reattachment of dirt detached from the clothing can be suppressed to reduce darkening of the clothing after washing.

  The drum type washing machine of the present invention can reduce the darkness of clothes after washing by suppressing the reattachment of dirt detached from the clothes.

1 is a schematic configuration diagram of a drum-type washing machine according to Embodiment 1 of the present invention. Block diagram of the drum type washing machine Time chart showing the operation of the washing process of the drum type washing machine Time chart showing the operation of the washing process of the drum type washing machine in Embodiment 2 of the present invention

  A first aspect of the present invention is a rotating drum provided rotatably in a water receiving tub, a driving means for rotationally driving the rotating drum, a water supplying means for supplying washing water into the water receiving tub, and the water receiving tub Draining means for draining the washing water inside, an overflow hole for discharging water exceeding the water level that can be stored in the water receiving tank, a water level detecting means for detecting the water level in the water receiving tank, washing, rinsing, Control means for controlling each process such as dehydration, and when the darkening suppression course is set, the control means in the water receiving tank after a washing time shorter than a predetermined washing time in the standard course in the washing process The process of draining the washing water and then supplying new washing water to the vicinity of the overflow hole, stirring, and draining is repeated at least twice. It drains in a shorter period of time, shortens the contact time between the dirty washing water and the clothing, and releases the dirt remaining on the clothing to the maximum amount of washing water that can be stored in the water receiving tank. The reattachment of the detached dirt can be suppressed, and darkening of clothes after washing can be reduced.

  According to a second aspect of the invention, in particular, in the first aspect of the invention, in the washing step, the control means has a centrifugal force greater than gravity before the first drainage, and the washing water in the rotating drum passes through the laundry. By rotating the rotating drum at the number of rotations discharged into the water receiving tank, in addition to the effect of the first invention, it is possible to effectively remove stains on clothes and enhance the darkening reduction effect. it can.

  According to a third aspect of the invention, in particular, in the first or second aspect of the invention, the control means performs dehydration after the second drainage in the washing step. It is possible to effectively remove the stains remaining on the surface and enhance the darkening reduction effect.

  According to a fourth aspect of the invention, in particular, in the third aspect of the invention, in the washing step, the control means sets the maximum rotational speed of the rotating drum in the dewatering after the second drainage to the maximum of the intermediate dewatering and final dewatering in the rinsing. By setting it lower than the rotational speed, in addition to the effects of the first invention, it is possible to reduce the power consumption and the washing time.

  In a fifth aspect of the invention, in particular, in any one of the first to fourth aspects of the invention, the control means performs at least one rinsing step including intermediate dehydration, water supply, agitation, and drainage after the washing step. As a result, in addition to the effects of any one of the first to third inventions, it is possible to effectively remove stains on clothes even during rinsing, thereby enhancing the darkening reduction effect, and the rinsing effect is achieved during washing. Even if the number of times of rinsing is reduced, the detergent component of the clothes can be sufficiently rinsed.

  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 circuit diagram of the drum type washing machine, and FIG. 3 is a washing process of the drum type washing machine. It is a time chart which shows operation | movement.

  1 to 3, a water receiving tank 2 elastically supported by a damper (not shown) or the like is provided in a housing 1. A cylindrical rotating drum 3 with a bottom is rotatably provided in the water receiving tank 2, and its rotating shaft 3a is provided substantially horizontally and in the front-rear direction.

  A plurality of baffles 4 projecting inward toward the rotation center of the rotary drum 3 in the direction of the rotary shaft 3 a and a large number of small holes 5 communicating with the inside of the water receiving tank 2 are formed on the inner peripheral wall surface of the rotary drum 3. And an opening 6 through which laundry such as clothing (hereinafter referred to as clothing) is taken in and out.

  A motor (driving means) 7 for rotating the rotating drum 3 is attached to the rear surface of the water receiving tank 2. The motor 7 is constituted by a brushless DC motor, and the rotation speed can be freely changed by inverter control.

  Above the water receiving tank 2, a water supply valve (water supply means) 8 for supplying washing water into the water receiving tank 2 is provided. The water supply valve 8 is provided in a water supply pipe 9 connected to water supply or the like. The supplied wash water is supplied into the water receiving tank 2 through a detergent storage part (not shown) provided downstream of the water supply valve 8 and is stored in the bottom of the water receiving tank 2 while being small. It flows into the rotary drum 3 from the hole 5.

  A water intake 10 is provided at the lowest part on the rear side of the water receiving tank 2. The water intake 10 is connected to a drain pipe 12 through a drain valve (drainage means) 11 that drains the washing water in the water receiving tank 2, and the washing water in the water receiving tank 2 drains through the drain valve 11. It is made to discharge outside the machine through the pipe 12.

  From between the water intake 10 and the drain valve 11, the discharge water for discharging the wash water in the water receiving tub 2 taken in from the water intake 10 into the rotary drum 3 from the opening 6 provided on the front side of the rotary drum 3. The circulation path 14 connected to 13 is connected in communication. The circulation path 14 is disposed in the front-rear direction below the water receiving tank 2.

  By driving the circulation pump 15 provided in the circulation path 14, the wash water in the water receiving tub 2 passes through the circulation path 14 and is discharged as a circulation shower toward the rotary drum 3, and the wash water is discharged to the clothes in the rotary drum 3. Can be applied.

An overflow hole 16 for discharging water exceeding the storable water level is provided at the rear part of the water receiving tank 2, and the overflow hole 16 and the drain pipe 12 are connected to each other through an overflow path 17. The overflow hole 16 is provided at a position of a predetermined height from the lowest part of the water receiving tank 2 and is provided at a position higher than the water level corresponding to the rated maximum clothing capacity (for example, 10 kg) of the drum type washing machine. The washing water having a level higher than that of the overflow hole 16 enters the overflow path 17 from the overflow hole 16 and is discharged out of the machine through the drain pipe 12. The water level detection means 18 detects the water level of the washing water supplied into the water receiving tank 2. In addition, the overflow hole 16 may be provided in the front part of the water receiving tank 2 if it is a position higher than the water level corresponding to the rated maximum clothing capacity (for example, 10 kg) of a drum type washing machine.

  The control device 19 has a control means 20 composed of a microcomputer, controls the operations of the motor 7, the water supply valve 8, the drain valve 11, the circulation pump 15 and the like via the power switching means 21, and performs washing, rinsing, A series of steps such as dehydration are sequentially controlled.

  The input setting means 22 is for setting a driving course and the like. The control means 20 inputs information from the input setting means 22 and displays it on the display means 23 based on the information to notify the user. The storage unit 24 stores data necessary for control by the control unit 20.

  The rotation speed detection means 25 detects the rotation speed of the rotary drum 3. The control means 20 controls the rotation speed of the rotary drum 3 through the power switching means 21 from the information of the rotation speed detection means 25. 26 is a commercial power source, and 27 is a power switch.

  In addition, by opening the door 28 that can be opened and closed provided on the front surface of the housing 1, clothes can be taken in and out from the opening 6 provided on the front surface side of the rotary drum 3.

  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.

  First, when the door 28 that can be freely opened and closed is opened on the front side of the housing 1, clothes are put into the rotary drum 3 from the opening 6, and the power switch 27 is turned on, a washing course or the like is set by the input setting means 22. It becomes possible to input. The washing course is a course that automatically sets the time and water level for each washing, rinsing, and dehydration process according to the amount of clothing on the washing machine side, and does not require a special washing method. A plurality of washing courses can be selected according to the purpose including the “standard course” selected by the user when washing, and displayed on the display means 23.

  A course that suppresses redeposition of dirt detached from clothing and suppresses darkening of clothing after washing is referred to herein as a “darkening suppression course”. The names of courses such as “standard course” and “darkening suppression course” may be any names as long as they have the same function. When the user sets the “darkening suppression course” and operates the start button (not shown) to start operation, the washing process is started.

  In the washing process, the amount of clothes first put in the rotary drum 3 is detected by the cloth amount detection means 29. The amount of clothing can be detected from the amount of torque applied to the motor 7 when the rotary drum 3 rotates and the current value of the motor 7 and the like.

  The control means 20 determines a preset amount of water, amount of detergent, etc. according to the amount of clothing detected by the cloth amount detection means 29, displays it on the display means 23, informs the user, and the user uses the detergent and softness. In consideration of the time for adding the agent or the like, after a predetermined time (for example, 1 minute) has elapsed, water supply is started and the first washing is performed.

The water that has passed through the water supply valve 8 passes through a detergent storage section (not shown), flows into the water receiving tub 2 together with the detergent put in the detergent storage section, and stores the washing water, and is preset by the water level detection means 18. When it is detected that the water has been supplied up to the predetermined amount (water level L1), the water supply valve 8 is closed and the counting of the washing time is started. At this time, the drain valve 11 is closed and driving of the rotary drum 3 and the circulation pump 15 is stopped.

  Stir clothing after water supply. The rotating drum 3 performs a tumbling operation at a rotational speed at which the clothes are beaten and washed by the motor 7, for example, 50 rpm, and rotates forward and backward alternately every predetermined time. For example, while driving with “right rotation 11 seconds → stop 4 seconds → left rotation 11 seconds → stop 4 seconds → right rotation 11 seconds”, the circulation pump 15 is driven.

  By driving the circulation pump 15, the washing water in the water receiving tub 2 flows into the circulation path 14 from the water intake 10, and from the discharge port 13 provided on the front side of the rotating drum 3 toward the clothing in the rotating drum 3, Washing water is discharged as a circulating shower.

  When the washing time (here, “stirring time” in FIG. 3) measures the predetermined time T1, the control means 20 stops the rotary drum 3 and the circulation pump 15, opens the drain valve 11 and opens water from the drain pipe 12. The dirty washing water in the receiving tank 2 is drained.

  The predetermined time T1 is shorter than a predetermined washing time in the standard course corresponding to the amount of clothing, and preferably is a time that is more than half of the predetermined washing time. For example, the predetermined time T1 is a predetermined time in the standard course corresponding to the amount of normal clothing. When the washing time is 10 minutes, the predetermined washing time T1 in the darkening suppression course is shorter than the predetermined washing time in the standard course, preferably 5 minutes or more and less than 10 minutes. Specifically, For example, 7 minutes.

  When the first drain is completed, the second wash is performed. The water supply valve 8 is opened to supply water, and washing water is stored in the water receiving tank 2 through the detergent container. At this time, the drain valve 11 is closed and driving of the rotary drum 3 and the circulation pump 15 is stopped.

  Since there is no detergent in the detergent storage part and only water is supplied, the detergent concentration in the water receiving tank 2 becomes thinner. When the water level detection means 18 detects that the water has been supplied to the vicinity of the overflow hole 16 (the water level L2) and higher than the water level L1, the water supply valve 8 is closed.

  Stir clothing after water supply. The rotating drum 3 performs a tumbling operation at a rotational speed at which the clothes are beaten and washed by the motor 7, for example, 50 rpm, and rotates forward and backward alternately every predetermined time. For example, while driving with “right rotation 11 seconds → stop 4 seconds → left rotation 11 seconds → stop 4 seconds → right rotation 11 seconds”, the circulation pump 15 is driven.

  When the washing time (stirring time) measures a predetermined time T2 (for example, 3 minutes), the control means 20 stops the rotary drum 3 and the circulation pump 15 and opens the drain valve 11 to drain the water a second time. The washing water in the water receiving tank 2 is drained from 12.

  When the second drainage is completed, simple dehydration in the washing process (hereinafter referred to as light dehydration) is performed. In light dehydration, the rotating drum 3 is rotated, and the rotating drum 3 is stopped by increasing the number of rotations of the rotating drum 3 to, for example, 300 rpm through balance control. By this light dehydration, washing water containing dirt that causes darkening remaining on the clothes is discharged out of the machine.

  When light dehydration is over, the third wash is performed. The water supply valve 8 is opened to supply water, and washing water is stored in the water receiving tank 2 through the detergent container. At this time, the drain valve 11 is closed and driving of the rotary drum 3 and the circulation pump 15 is stopped.

  Since there is no detergent in the detergent storage part and only water is supplied, the detergent concentration in the water receiving tank 2 becomes thinner. When it is detected by the water level detection means 18 that water has been supplied to the vicinity of the overflow hole 16 (water level L2), the water supply valve 8 is closed.

  Stir clothing after water supply. The rotating drum 3 performs a tumbling operation at a rotational speed at which the clothes are beaten and washed by the motor 7, for example, 50 rpm, and rotates forward and backward alternately every predetermined time. For example, while driving with “right rotation 11 seconds → stop 4 seconds → left rotation 11 seconds → stop 4 seconds → right rotation 11 seconds”, the circulation pump 15 is driven.

  When the washing time (stirring time) measures a predetermined time T3 (for example, 6 minutes), the control means 20 stops the rotary drum 3 and the circulation pump 15, opens the drain valve 11, and drains the water for the third time. The washing water in the water receiving tank 2 is drained from 12, and the washing process is completed.

  A rinsing step is performed following the washing step. When the rinsing process is set twice, the intermediate dehydration 1 of the first rinsing is started, the rotating drum 3 is rotated, and the rotational speed of the rotating drum 3 is increased to about 900 rpm which is a predetermined rotational speed through balance control. And stop after a predetermined time. By this intermediate dehydration 1, the washing water remaining in the clothes is discharged out of the machine, and the washing water contained in the clothes is reduced.

  Subsequent to the intermediate dehydration 1, the water supply valve 8 is opened to supply water, and the washing water is stored in the water receiving tank 2 through the detergent container. When it is detected by the water level detection means 18 that water has been supplied to a predetermined water level (L1), the water supply valve 8 is closed.

  The rotating drum 3 performs a tumbling operation at a rotation speed at which the clothing is beaten and washed by the motor 7, for example, 50 rpm, and drives the circulation pump 15 while agitating the clothing by alternately rotating forward and reverse every predetermined time. Then, the washing water is discharged into the rotating drum 3 as a circulating shower. When a predetermined rinsing time elapses, the drain valve 11 is opened to drain the washing water used for rinsing in the water receiving tank 2.

  When the drainage is finished, the second intermediate rinsing 2 is started, the rotating drum 3 is rotated, the rotational speed of the rotating drum 3 is increased to about 900 rpm through the balance control, and stopped after a predetermined time. To do. By this intermediate dehydration 2, the washing water remaining in the clothes is discharged out of the machine, and the washing water contained in the clothes is reduced.

  Following the intermediate dehydration 2, a second rinse is performed. The water supply valve 8 is opened to supply water, and the washing water is stored in the water receiving tank 2 through the detergent storage portion in the same manner as the first rinsing. At this time, the softening agent put into the detergent container is poured into the water receiving tank 2 together with the supplied wash water.

  The rotating drum 3 performs a tumbling operation at a rotation speed at which the clothes are washed by the motor 7, for example, 50 rpm. The rotating drum 3 is driven to rotate forward and reverse alternately every predetermined time, and the circulating pump 15 is driven to move inside the rotating drum 3. The washing water is discharged as a circulating shower. When the second predetermined rinsing time has elapsed, the drain valve 11 is opened, and the washing water used for rinsing in the water receiving tank 2 is drained. The rinsing process including intermediate dehydration, stirring, and drainage may be performed at least once.

A final dehydration step is performed following the rinsing step. In the final dewatering step, the rotating drum 3 is rotated, the number of rotations of the rotating drum 3 is increased to about 900 rpm, which is a predetermined number of rotations, through balance control, and stopped after a predetermined time. By this final dehydration step, the washing water remaining in the clothing is discharged out of the machine, and the washing water contained in the clothing is reduced. Washing is completed when the rotary drum 3 stops.

  The “darkening suppression course” has been described so far, but the “standard course” will also be described.

  When the user sets a “standard course” and operates a start button (not shown) to start operation, the washing process is started.

  In the washing process, the amount of clothes first put in the rotary drum 3 is detected by the cloth amount detection means 29. The amount of clothing can be detected from the amount of torque applied to the motor 7 when the rotary drum 3 rotates and the current value of the motor 7 and the like.

  The control means 20 determines a preset amount of water, amount of detergent, etc. according to the amount of clothing detected by the cloth amount detection means 29, displays it on the display means 23, informs the user, and the user uses the detergent and softness. In consideration of the time for adding the agent or the like, after a predetermined time (for example, 1 minute) has elapsed, water supply is started and washing is performed.

  The water that has passed through the water supply valve 8 passes through a detergent storage section (not shown), flows into the water receiving tub 2 together with the detergent put in the detergent storage section, and stores the washing water, and is preset by the water level detection means 18. When it is detected that the water has been supplied up to the predetermined amount (water level L1), the water supply valve 8 is closed and the counting of the washing time is started. At this time, the drain valve 11 is closed and driving of the rotary drum 3 and the circulation pump 15 is stopped.

  Stir clothing after water supply. The rotating drum 3 performs a tumbling operation at a rotational speed at which the clothes are beaten and washed by the motor 7, for example, 50 rpm, and rotates forward and backward alternately every predetermined time. For example, while driving with “right rotation 11 seconds → stop 4 seconds → left rotation 11 seconds → stop 4 seconds → right rotation 11 seconds”, the circulation pump 15 is driven.

  By driving the circulation pump 15, the washing water in the water receiving tub 2 flows into the circulation path 14 from the water intake 10, and from the discharge port 13 provided on the front side of the rotating drum 3 toward the clothing in the rotating drum 3, Washing water is discharged as a circulating shower.

  The control means 20 stops the rotary drum 3 and the circulation pump 15 when the washing time is a predetermined time (a time longer than T1 in FIG. 3), opens the drain valve 11 and opens the drain pipe 12 into the water receiving tank 2. Drain dirty wash water.

  As the predetermined time T1, for example, a predetermined washing time (for example, 10 minutes) in a standard course corresponding to the amount of normal clothing is set. The predetermined washing time in the standard course is longer than the predetermined washing time T1 in the darkening suppression course.

  After a predetermined washing time in the standard course has elapsed, draining is performed, and the washing water in the water receiving tub 2 is drained from the drain pipe 12 to finish the washing process. Therefore, the process of washing (no detergent) → light dehydration → washing (no detergent) described in FIG. 3 does not exist in the standard course as in the darkening suppression course.

  A rinsing step is performed following the washing step. The process from the rinsing process to the end of washing is the same as the darkening suppression course described above.

As described above, in the present embodiment, the rotating drum 3 that is rotatably provided in the water receiving tub 2, the driving means 7 that rotationally drives the rotating drum 3, and the washing water is supplied into the water receiving tub 2. Water supply means 8 for draining, draining means 11 for draining washing water in the water receiving tub 2, overflow hole 16 for discharging water exceeding the water level that can be stored in the water receiving tub 2, and water level in the water receiving tub 2 Water level detection means 18 and control means 20 for controlling each process such as washing, rinsing, dehydration, etc. When the darkening suppression course is set, the control means 20 is set in the standard course in the washing process. The washing water in the water receiving tub 2 is drained after a rinsing time shorter than the washing time, and then the process of supplying new agitation water to the vicinity of the overflow hole 16 and stirring and draining is repeated at least twice. In In the first washing with washing water containing detergent, drain the washing water containing a lot of dirt in a shorter time than the predetermined washing time, shorten the contact time between the dirty washing water and the clothing, and leave it on the clothing It is possible to release the dirt to be washed into the maximum amount of washing water that can be stored in the water receiving tank, and to reduce the redeposition of the dirt detached from the clothes and reduce the darkening of the clothes after washing.

  Moreover, in the washing process, dehydration is performed after the second drainage, and dirt that has not been removed from the clothes can be discharged only by drainage, and the darkening reduction effect of clothes after washing can be enhanced. it can.

  In the washing process, the maximum rotation speed of the rotating drum 3 in the dehydration after the second drainage is set lower than the maximum rotation speed in the intermediate dehydration and final dehydration in the rinsing, and the darkness of the clothes after washing is reduced. It is possible to reduce power consumption and washing time.

  In addition, after the washing process is completed, the rinsing process including intermediate dehydration, water supply, agitation, and drainage is performed at least once, so that dirt on clothes is effectively removed even during rinsing, and the darkening reduction effect is enhanced. Since it has a rinsing effect at the time of washing, even if the number of times of rinsing is reduced, the detergent component of the clothes can be sufficiently rinsed.

(Embodiment 2)
FIG. 4 is a time chart showing the operation of the washing process in the darkening suppression course of the drum type washing machine in the second embodiment of the present invention. The feature of the present embodiment is that in the washing process of the darkening suppression course, before the first drainage, the centrifugal force is greater than the gravity after a lapse of a predetermined time, and the washing water in the rotating drum 3 receives water through the clothing. The rotating drum 3 is rotated at the number of revolutions discharged into the tank 2, and then shorter than the predetermined washing time in the standard course, preferably after the washing time of half or more of the predetermined washing time has elapsed, Washing water is drained. 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 the washing step, after detecting the amount of the thrown-in clothes by the cloth amount detecting means 29, the water supply valve 8 is opened, and the water that has passed through the water supply valve 8 passes through the detergent storage part and is supplied to the detergent storage part. At the same time, the washing water flows into the water receiving tank 2 and when the water level detecting means 18 detects that water has been supplied up to a predetermined amount (water level L1), the water supply valve 8 is closed and the washing time is started. To do. At this time, the drain valve 11 is closed, and driving of the rotary drum 3 and the circulation pump 15 is stopped.

  After the water supply, the rotating drum 3 performs a tumbling operation at a rotation speed at which the clothes are washed by the motor 7, for example, 50 rpm, and rotates forward and backward alternately every predetermined time. For example, while driving with “right rotation 11 seconds → stop 4 seconds → left rotation 11 seconds → stop 4 seconds → right rotation 11 seconds”, the circulation pump 15 is driven.

By driving the circulation pump 15, the washing water in the water receiving tub 2 flows into the circulation path 14 from the water intake 10, and from the discharge port 13 provided on the front side of the rotating drum 3 toward the clothing in the rotating drum 3,
Washing water is discharged as a circulating shower.

  When the washing time (stirring time) measures a predetermined time T4 (for example, 5 minutes), the control means 20 starts centrifugal force washing in which the centrifugal force of the rotating drum 3 rotates at a rotational speed greater than gravity. The predetermined time T4 at this time is set to be shorter than the predetermined time T1.

  The control means 20 rotates the rotating drum 3 at a high speed in a fixed direction via the power switching means 21, receives the output signal of the rotation speed detecting means 25, and controls the rotation speed of the rotating drum 3. Due to the centrifugal force generated by rotating the rotating drum 3 at a high speed, the clothing is stuck to the inner peripheral wall surface of the rotating drum 3, and moisture contained in the clothing is squeezed out and provided on the rotating drum 3. It passes through many small holes 5 and moves to the water receiving tank 2 side.

  The number of rotations of the rotating drum 3 is preferably 150 rpm or more, more preferably 200 rpm or more, capable of forcibly removing moisture contained in the clothes by centrifugal force. When a predetermined time T5 (for example, 30 seconds) elapses after the rotating drum 3 exceeds a predetermined number of rotations, the rotation of the rotating drum 3 is stopped, and then the normal tumbling operation is performed to perform tapping. For example, a tumbling operation is performed at 50 rpm, and the forward / reverse rotation is alternately performed every predetermined time. For example, while driving with “left rotation 11 seconds → stop 4 seconds → right rotation 11 seconds”, the circulation pump 15 is driven.

  When the washing time (stirring time) measures the predetermined time T1, the control means 20 stops the rotating drum 3 and the circulation pump 15, opens the drain valve 11, and the dirty washing water in the water receiving tank 2 from the drain pipe 12. Drain the water. Subsequent operations are the same as those in the first embodiment.

  As described above, in the present embodiment, after the start of the washing process, before the first drainage, and during the first washing time T1, the centrifugal force is greater than the gravity, and the rotational drum 3 Centrifugal force washing is performed by rotating the rotating drum 3 at a rotation speed at which the washing water is discharged into the water receiving tub through the laundry, effectively removing stains on clothes and reducing darkening. Can be increased.

  Although the water receiving tank 2 and the rotating drum 3 are arranged horizontally, they may be inclined upward.

  Moreover, although the opening part 6 which takes in and out clothing was provided in the front side of the housing | casing 1, you may provide in the upper surface side. In this case, the overflow hole 16 can be provided at a high position in the water receiving tub 2, the maximum amount of washing water that can be stored in the water receiving tub 2 can be increased, and dirt remaining on the clothes can be removed with a large amount of washing water. Can be effectively released.

  In addition, the timing of water supply and circulation shower in each process of washing and rinsing is not limited, and the clothes are stirred by rotating the rotating drum 3 at a low speed when water is supplied into the water receiving tank 2. Alternatively, the circulation pump 15 may be driven to discharge the washing water to the rotating drum 3. Further, the rotational speed of the rotating drum 3 is not limited.

  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 clothes and reduce darkening of clothes after washing.

2 Water receiving tank 3 Rotating drum 7 Motor (drive means)
8 Water supply valve (water supply means)
11 Drain valve (drainage means)
16 Overflow hole 18 Water level detection means 20 Control means

Claims (5)

A rotating drum rotatably provided in the water receiving tank;
Drive means for rotationally driving the rotary drum;
Water supply means for supplying washing water into the water receiving tank;
Drainage means for draining the wash water in the water receiving tank;
An overflow hole for discharging water exceeding the water level that can be stored in the water receiving tank;
Water level detection means for detecting the water level in the water receiving tank;
Control means for controlling each process such as washing, rinsing and dehydration,
The control means includes
When the darkening suppression course is set, in the washing process, the washing water in the water receiving tub is drained after a washing time shorter than a predetermined washing time in the standard course,
Then, a drum type washing machine in which new washing water is supplied to the vicinity of the overflow hole, stirred and drained at least twice. The control means includes
In the washing step, the rotary drum is rotated at a rotation speed such that the centrifugal force is greater than gravity before the first drainage and the washing water in the rotary drum is discharged into the water receiving tank through the laundry. The drum type washing machine according to claim 1. The control means includes
The drum type washing machine according to claim 1 or 2, wherein dehydration is performed after the second drainage in the washing step. The control means includes
The drum type washing machine according to claim 3, wherein in the washing step, the maximum rotational speed of the rotating drum in the second dewatering after draining is set lower than the maximum rotational speed of the intermediate dewatering and final dewatering in the rinsing. The control means includes
The drum type washing machine according to any one of claims 1 to 4, wherein a rinsing step including intermediate dehydration, water supply, stirring, and drainage is performed at least once after the washing step.

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