JPH0716386A - Washing machine - Google Patents

Abstract

PURPOSE:To perform a more effective cooling down process for a washing of clothes for which a permanent press treatment was applied, and at the same time, shorten the period of time requiring for the cooling down process. CONSTITUTION:For a washing machine 1, cold water is fed to a washing water in an external tank 4 of a washing tub 4 by opening a cold water feeding valve 16 when a washing process is completed. At this time, the cold water is fed while the washing water in the external tank 4 of the washing tub 4 is being stirred by a stirring blade 26, and the washing water in the external tank 4 of the washing tub and the cold water are evenly mixed for a shorter period of time than a conventional method. Also, compared with a conventional method, clothes in the washing tub is cooled by a linear temperature descent while maintaining a fixed temperature gradient (cooling down process).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washing machine, and more particularly to a washing machine having a function of washing clothes that have been permanently pressed.

[0002]

2. Description of the Related Art In recent years, a washing machine equipped with a water supply valve for hot water and a water supply valve for cold water, respectively, which can supply hot water and tap water to a washing tub from an external water heater and water supply, has been put on the market. ing.

In such a washing machine, an initial water level setting step of setting an initial water level of washing water consisting of hot water and cold water or washing water consisting of only warm water supplied to a washing tub, and supplying the washing water up to the initial water level. The washing machine is provided with a washing water supply step, a washing step of washing clothes in the washing tub to which the washing water is supplied, a rinsing step of clothes with hot water or cold water newly supplied to the washing tub, and a dehydration step.

[0004] By the way, a garment that has been subjected to so-called permanent press processing for preventing the deformation of the shape and the generation of wrinkles will have wrinkles on the garment if a rinsing process with cold water is immediately performed after a washing process with warm water. In addition, when the rinsing process with warm water is performed after the washing process with warm water, the dehydration process is performed without cooling the clothes, and the temperature of the clothes sharply drops in the dehydration process, which also causes wrinkles on the clothes.

Therefore, there is a washing machine provided with a so-called cool-down process in which clothes are immersed in water having an intermediate temperature between hot water and cold water between the washing process with warm water and the rinsing process.
In Japanese Unexamined Patent Publication No. 61-119295, after the hot water after the washing process is completely drained from the washing tub, the hot water supply valve and the cold water supply valve are opened in a predetermined cycle to provide a laundry tub with clothes. There is disclosed a washing machine capable of appropriately performing a cool-down step of cooling clothes in a washing tub to an intermediate temperature between a washing step and a rinsing step by alternately supplying hot water and cold water.

[0006] By such a cool-down process, the clothes after the washing process with warm water are gently cooled and led to the rinsing process with cold water. For this reason, it is possible to prevent the clothes that have been subjected to permanent press processing from wrinkling due to washing. In the cool-down step, after the hot water and the cold water have been supplied to the washing tub, the stirring operation of stirring the hot water and the cold water in the washing tub is performed.

[0007]

In the cooling down process of the washing machine described in the above publication, the draining operation for completely draining the warm water after the washing process from the washing tub and the water supply for alternately supplying hot water and cold water to the washing tub The operation and the stirring operation for stirring hot water and cold water in the washing tub after the water supply operation are configured. Therefore, the cool down process requires a long time.

Further, since the warm water after the washing process is completely drained from the washing tub, the entire clothes are temporarily exposed to the outside air.
For this reason, there is a problem that the temperature drop of the clothes in the cool down step is intermittent and lacks linearity. In particular,
When the ambient temperature of the washing tub is lower than that of cold water, the temperature of the clothes may suddenly drop, and the effective cool down process may not be executed.

An object of the present invention is to carry out a more effective cool down step in washing clothes that have been permanently pressed and to shorten the time required for the cool down step.

[0010]

A washing machine according to the present invention is a washing machine having a function of washing clothes that have been permanently pressed, and is a washing water consisting of hot water and cold water supplied to a washing tub. Or an initial water level setting step of setting an initial water level of washing water consisting only of warm water, a washing water supplying step of supplying the washing water to the initial water level, and a washing step of washing clothes in a washing tub to which the washing water is supplied, After the washing process, the temperature of the washing water in the washing tub is lowered by supplying cold water to cool the clothes gently, and the rinsing process to rinse the cooled clothes with cold water is provided. It has a stirring / cooling water supply operation for supplying cold water while stirring the washing water in the washing tub.

[0011]

In the washing machine according to the present invention, the initial water level of the wash water consisting of hot water and cold water or the wash water consisting of only hot water supplied to the washing tub is set (initial water level setting step). Next, the wash water is supplied up to the initial water level (washing water supply step). Next, the clothes are washed in the washing tub to which the washing water is supplied (washing step). When the washing process is completed, cold water is supplied to the washing water in the washing tub. At this time, since the cold water is supplied while stirring the washing water in the washing tub, the washing water in the washing tub and the cold water are uniformly mixed in a shorter time than conventional. Further, the clothes in the washing tub are cooled linearly while maintaining a constant temperature gradient as compared with the conventional case. (Cooldown process).
Next, the cooled clothes are rinsed with cold water (rinsing step).

Thus, by providing the cool-down process that connects the temperature difference between the washing process and the rinsing process with a linear temperature decrease, the clothes subjected to the permanent press can be washed with less wrinkling. Be seen.

[0013]

FIG. 1 shows a fully automatic washing machine according to an embodiment of the present invention. This fully automatic washing machine 1 has a device body 2
A washing tub outer tub 4 elastically supported inside the device body 2 via a hanging rod 3, a washing tub inner tub 5 rotatably supported inside the outer tub 4, a washing tub 4, 5 and a stirring mechanism section 6 arranged in the lower part of the main section.

The device body 2 is a box body having an open upper surface, and an upper lid 7 which covers the upper surface of the device body 2 in an openable and closable manner is arranged on the upper part thereof. An upper lid sensor 8 is attached to the lower surface of the upper lid 7 to detect opening / closing of the upper lid 7 by contact with the device body 2 and to prohibit dehydration operation. An operation panel 9, which will be described later, is installed at the edge of the upper surface of the device body 2. A control board including a control unit 17 is arranged inside the operation panel 9. The legs 1 are attached to the four corners of the bottom surface of the device body 2.
0 is set respectively. On the other hand, a drain pipe 11 having flexibility for discharging the wash water in the outer tub 4 to the outside of the device body 2 is arranged in the lower part of the device body 2.

A drain hose 12 led out of the device body 2 is connected to the lower end of the drain pipe 11. A water supply port 13 for supplying hot water and a water supply port 14 for supplying cold water are formed above the outer tub 4 inside the device body 2 and open toward the outer tub 4. The water supply port 13 for supplying hot water has an electromagnetic hot water supply valve 15 and is connected to a hot water supply source such as a water heater (not shown). The water supply port 14 for supplying cold water has an electromagnetic type cold water supply valve 16 and is connected to a cold water supply source such as tap water (not shown). Upper ends of a plurality of hanging rods 3 are fixed to upper corners of the device body 2. The hanging bar 3 elastically supports the washing tubs 4 and 5 by elastic members (not shown) arranged at the upper end and the lower end.

The outer tank 4 is a resin container having an open top, and an electromagnetic drain valve 18 is connected to the bottom. An upper end portion of the drainage pipe 11 is connected to the drainage valve 18.
At the lower part of the outer tub 4, an air trap 19 is formed so as to project outward. The lower end of the pressure hose 20 is connected to the inside of the air trap 19, and the pressure hose 2
The upper end of 0 is the water level sensor 21 arranged on the control board 17.
It is connected to the. The water level sensor 21 detects a water level change in the outer tub 4 as a change in the air pressure in the pressure hose 20. A thermistor 22 is installed on the lower surface of the air trap 19.

The thermistor 22 is a member for measuring the water temperature in the outer tub 4 and controlling the water supply valve 16 of the water supply port 14 for supplying cold water based on the measurement result, and is connected to the control board 17. Has been done. Further, an overflow port 23 for discharging the wash water overflowing from the outer tub 4 is formed on the inner wall surface of the upper part of the outer tub 4. Overflow port 23
Is connected to the drainage pipeline 11 by a pipeline (not shown). The inner tub 5 of the washing tub is a cylindrical member having an open top,
It is supported by the outer tub 4 by a rotating shaft 24. A large number of dehydration holes 5a are formed on the side surface of the inner tank 5. A stirring mechanism 6 is arranged at the bottom of the inner tank 5.

The stirring mechanism section 6 includes a stirring blade 25 for stirring the washing water and the laundry put in the inner tub 5, and a motor 2 fixed to the lower surface of the outer tub 4 for rotating the stirring blade 25.
It is mainly composed of 6 and 6. The stirring blade 25 is a disc-shaped member arranged at the bottom of the inner tank 5, and is a bearing case fixed to the lower surface of the outer tank 4 via a rotary shaft 24 that rotatably passes through the bottom of the inner tank 5. It is connected to 27. Further, the bearing case 27 is connected to the motor 26 via a belt mechanism 28 including a pair of pulleys and a pulley belt. With such a configuration, the rotational force of the motor 26 can be transmitted to the stirring blade 25. The motor 26
Is electrically connected to the control board 17 and is rotatable in the forward and reverse directions. Further, the bearing case 27 is provided with a braking torque motor 29 for braking the rotation of the inner tub 5 in the dehydration process by operating the upper lid switch 8.

As shown in FIG. 2, the operation panel 9 has a key input section 31 including a plurality of setting switches for setting various washing conditions including a power switch 30.
The setting switch includes a standard course switch 32 for setting the standard mode, a permanent press course switch 33 for setting the washing mode of clothes that have been permanently pressed, and a washing mode in which the execution time of the washing process is short. Speedy course switch 34 for setting
And a delicate course switch 35 for setting a washing mode in which the rotation of the stirring blade 25 is suppressed, and a sickle course switch 36 for setting a washing mode in which the execution time of the washing process is long. In addition, the operation panel 9
Includes a temporary stop / restart switch 37 for interrupting the process set by the select switch and restarting the process interrupted from that state. Further, the operation panel 9 is provided with a washing / rinsing temperature setting switch 38 and a water level setting switch 39.

The washing / rinsing temperature setting switch 38 is set to "high / high" to indicate the water temperature setting in the washing / rinsing process.
It is provided with three LED display sections of "cold", "hot / cold", and "cold / cold". When the washing / rinsing temperature setting switch 38 is pressed only once, it is set to "high / cold". In this case, only the water supply valve 15 for hot water supply is opened in the washing water supply step of supplying the washing water to the initial water level, which will be described later, and the high temperature washing water is supplied to the washing tub for the washing step. Further, in the rinsing process, a water supply valve 1 for supplying cold water
It is set that only 6 is opened.

When the washing / rinsing temperature setting switch 38 is pressed twice, it is set to "warm / cold". In this case, both the hot water supply water supply valve 15 and the cold water supply water supply valve 16 are opened in the washing water supply process, and the washing water at an intermediate temperature between the hot water and the cold water is used for the washing process. Are supplied to the washing tub. Further, in the rinsing process, only the water supply valve 16 for supplying cold water is set to be opened.

When the washing / rinsing temperature setting switch 38 is pressed three times, it is set to "cool / cold". In this case, only the water supply valve 16 for supplying cold water is opened in the washing water supplying step, and cold water is supplied to the washing tub as washing water for the washing step. In addition, in the rinsing step, only the water supply valve 16 for supplying cold water is set to be opened. In addition, when the "permanent press course" is set by operating the permanent press course switch 33, washing /
The rinsing temperature is automatically set to "warm / cold" described above.
This is to prevent this because the characteristics of the clothing subjected to the permanent press course are lost if only hot water is supplied and the laundry is washed with high-temperature washing water in the washing step of the "permanent press course".

The water level setting switch 39 is "high" for indicating the setting of the initial level of the washing water supplied to the washing tub,
It is equipped with four LED display sections consisting of "medium", "low", and "small amount". By pressing the water level setting switch 39, the washing water can be supplied up to the initial water level of the washing tub corresponding to the above four stages.

FIG. 3 is a block diagram of a fully automatic washing machine. The device body 2 has a control unit 17 including a microcomputer having a CPU, a ROM, a RAM, a timer, a counter, and the like. The control unit 17 includes a key input unit 3
1, water level sensor 21, top cover switch 8, thermistor 22
Are connected.

Further, the control unit 17 includes a drive motor 26, a brake torque motor 29, and a brake torque motor 29 via a drive circuit unit 40.
Drain valve 18, hot water supply valve 15, cold water supply valve 16
Are connected. Further, the control unit 17 is connected to a power supply circuit unit 42, an LED display unit 43 for displaying a laundry state, and other input / output units 44.

The fully automatic washing machine of this embodiment has a controller 17
And operates as described below. 4 to 8 are control flowcharts thereof. When the power switch 30 is turned on, first, initial setting is performed in step S1. In this initial setting, processing such as setting each input / output unit to the initial state is performed. Next, in step S2, the operation menu is displayed. Here, items such as the washing mode, the temperature of the washing water supplied to the washing tub, and the initial water level are displayed.

In steps S3 to S5, steps S3 to S are performed on the displayed operation menu.
It is determined which of the five processes has been designated. That is, in step S3, it is determined whether the standard mode is designated. In step S4, it is determined whether or not the permanent press mode is designated. In step S5, it is determined whether another processing mode is designated.

In step S6, it is determined whether or not an end command has been issued. Until the end command is issued, step S2
Then, the processing is terminated when the termination command is issued. When the standard mode is designated, the process proceeds from step S3 to step S7. In step S7, standard setting processing is executed based on the settings. When the permanent press mode is designated, the process proceeds from step S4 to step S8.

In step S8, the permanent press setting process is executed based on the key input from the key input unit 72. If another process is designated, the process proceeds from step S5 to step S9. In step S9, the key input unit 3
Processing corresponding to the switch type set in 1 is executed, that is, processing such as speedy course, delicate course, sickle course, and pause / restart.

Standard Mode When the standard mode is selected, step S1 in FIG.
When 0, the setting menu is displayed. Next, step S11
Then, the operator sets the water level according to the amount of laundry to be washed, by selecting one of four levels. Next, step S1
In 2, the operator sets the temperature of the wash water supplied in the washing and rinsing steps by one of three steps.

Next, steps S13 to S15
In step S12, the open / close mode of the hot water supply valve 15 and the cold water supply valve 16 is set based on the wash water temperature in the washing and rinsing process set in step S12. In step S13, the set washing water temperature in the washing and rinsing process is "high / high".
If it is determined to be "cold", the process proceeds to step S16.
In step S16, the hot water supply valve 15 is opened and the supply of washing water to the outer tub 4 is started. If the determination in step S13 is no, the process moves to step S14. If it is determined in step S14 that the set washing water temperature in the washing and rinsing process is "warm / cold", the process proceeds to step S17. In step S17, the hot water supply valve 15 and the cold water supply valve 16 are simultaneously opened to start the supply of washing water to the outer tub 4. If the determination in step S14 is no,
Control goes to step S15.

When it is determined in step S15 that the set washing water temperature in the washing and rinsing process is "cool / cold", the process proceeds to step S18. In step S18, the cold water supply valve 16 is opened and the supply of washing water to the outer tub 4 is started. If the determination in step S15 is no,
It returns to step S12. Next, in step S19, the water level sensor 45 determines whether or not the wash water has been supplied up to the set water level in the outer tub 4. The judgment in step S19 is N
If the value is O, the wash water is continuously supplied.

When it is determined that the wash water has been supplied up to the set water level, the process proceeds from step S19 to step S20. In step S20, the hot water supply valve 15 and the cold water supply valve 16 are closed, and the supply of washing water is stopped. Next, in step S21, the driving of the motor 26 is started to start the stirring blade 2
5 is rotated in the forward and reverse directions at a predetermined cycle. Next, in step S22, it is determined by the timer whether the washing time Tw has elapsed. When the washing time Tw has passed,
Control goes to step S23. In step S23, driving of the motor 26 is stopped. Next, in step S24,
Execute the rinsing / dehydration process subroutine.

In the rinsing / dewatering process shown in FIG. 6, the setting menu is first displayed in step R1. Next, in step R2, the drain valve 18 is opened to start discharging the wash water in the outer tub 5. Next, in step R3, it is determined whether or not the wash water in the outer tub 5 has been discharged. When it is determined in step R3 that the washing water has been discharged, the process proceeds to step R4. In step R4, the drain valve 18 is closed. Next, in step R5, the cold water supply valve 16 is opened and the outer tank 5 is opened.
Supply cold water for rinsing. Next, in step R6, it is determined whether or not the cold water in the outer tub 5 has reached the set water level. When it is determined in step R6 that the cold water in the outer tub 5 has reached the set water level, the process proceeds to step R7.

In step R7, the cold water supply valve 16 is closed to stop the supply of cold water. Next, in step R8, the motor 26 is driven to rotate the stirring blade 25 in the forward and reverse directions. Next, in step R9, a timer determines whether or not the rinsing time Tr has elapsed. When the rinsing time Tr has elapsed, the process proceeds to step R10. Step R
At 10, the driving of the motor 26 is stopped. Next, in step R11, the drain valve 18 is opened. In step R12, it is determined whether or not the top cover switch 8 is in the ON state. When it is determined in step R12 that the top cover switch 8 is in the ON state, that is, the top cover 7 is closed, step R
Move to 13. When the determination in step R12 is NO, the fact that the upper lid 7 is not closed is displayed and the operation waits until the upper lid 7 is closed.

In step R13, the clutch stored in the bearing case 27 is switched to move the inner tank 5 to the motor 2
6 and the torque motor 29 for braking is driven. Next, in step R14, a timer determines whether or not the dehydration time Td has elapsed.
When the dehydration time Td has elapsed, the routine goes to Step R15. In step R15, driving of the motor 26 is stopped. When the rinsing / dehydration process is completed, step S in FIG.
The control proceeds from step 24 to step S25. In step S25, it is determined whether or not another command is issued. When another command is issued, the process proceeds from step S25 to step S26, and another specified process, that is, a process such as closing the drain valve 18 is executed. Next, in step S27, it is determined whether or not a termination instruction has been issued. The process returns to step S10 until the end command is issued, and returns to the main routine when the end command is issued.

Permanent Press Mode FIG. 9 also shows a time chart of the permanent press mode. In the permanent press course setting process of step S8, the setting menu is displayed in step P1 of FIG. Here, items such as water level setting and end are displayed. Next, in step P2, step P
Based on the display of 1, the water level of the wash water supplied to the outer tub 4 is set. When the water level is set, the process moves from step P2 to step P3. In step P3, the hot water supply valve 15 and the cold water supply valve 16 are simultaneously opened, and the outer tank 4
To start supplying wash water to. In Step P4, it is determined whether or not the water level in the outer tub 4 has reached the set water level.

Until the water level in the outer tank 4 reaches the set water level,
Returning to step P4, when the water level in the outer tub 4 reaches the set water level, the process moves from step P4 to step P5. In step P5, both the hot water supply valve 15 and the cold water supply valve 16 are closed. Next, in Step P6, the driving of the motor 26 is started to rotate the stirring blade 25 in the forward and reverse directions at a predetermined cycle. Next, in Step P7, it is determined by the timer whether the washing time Tw has elapsed. When the washing time Tw has elapsed, the process moves from Step P7 to Step P8. In step P8, the driving of the motor 26 is stopped. Next, in step P9, a cool-down process subroutine is executed.

In the cool down step shown in FIG. 8, first, in steps C1 to C3, the initial set water level for the outer tub 5 is judged. In step C1, if it is determined that the initial set water level is high water level setting, step C4
Move to. In step C4, the drain valve 18 is opened. Next, in step C5, it is determined whether or not the water level in the outer tub 4 has reached a low water level. Until the water level in the outer tub 4 reaches the low water level, the process returns to step C5, and when the water level in the outer tub 4 reaches the low water level, the process shifts from step C5 to step C6.

In step C6, the drain valve 18 is closed.
Next, in step C7, the cold water supply valve 16 is opened, and the process proceeds to step C8. In step C8, the motor 26
Is started to rotate the stirring blade 25 in the forward and reverse directions at a predetermined cycle. Next, in step C9, it is determined whether or not the water level in the outer tub 4 has reached the high water level. Until the water level in the outer tank 4 reaches the high water level, the process returns to step C9.

If it is determined in step C1 that the initially set water level for the outer tank 4 is not the high water level setting, the process proceeds to step C2. In step C2, when it is determined that the initial set water level is the medium water level setting, the process proceeds to step C10. In step C10, the drain valve 18 is opened. Next, in step C11, it is determined whether or not the water level in the outer tub 4 has been washed with a small amount and has reached the water level.

The process returns to step C11 until the water level in the outer tub 4 reaches a small washing water level, and when the water level in the outer tub 4 reaches the small washing water level, the process shifts from step C11 to step C12.

At step C12, the drain valve 18 is closed. Next, in step C13, the cold water supply valve 16 is opened, and the process proceeds to step C14. In Step C14,
The driving of the motor 26 is started and the stirring blade 25 is rotated in the forward and reverse directions at a predetermined cycle. Next, in step C15, it is determined whether the water level in the outer tub 4 has reached the intermediate water level. Outer tank 4
It returns to step C15 until the water level of reaches the middle water level.

If it is determined in step C2 that the initially set water level for the outer tank 4 is not the medium water level setting, the process proceeds from step C2 to step C3. In step C3,
When it is determined that the initial set water level is not the small amount wash water level setting, the process returns to step C1. When it is determined in step C3 that the initially set water level is the small amount wash water level setting, the process proceeds to step C16. In step C16, the cold water supply valve 16 is opened. Next, in Step C17, the motor 2
6 is started to rotate the stirring blade 25 in the forward and reverse directions at a predetermined cycle. Next, in step C18, it is determined whether or not the water level in the outer tub 4 has reached the intermediate water level. Until the water level in the outer tank 4 reaches the medium water level, the process returns to step C18.

The water level in the outer tub 4 is steps C9, C15, C
When each set water level in 18 is reached, the process proceeds to step C19. In step C19, the cold water supply valve 16 is closed,
The cool down process ends. When the cool down process is completed, it returns to the main routine of permanent mode,
The process moves from step P9 to step P10. In Step P10, the above-mentioned rinsing / dewatering process is executed.

When the rinsing / dehydration process is completed, step P
The process moves from step 10 to step P11. In Step P11, it is determined whether or not another command is issued. When another command is issued, the process proceeds from step P11 to step P12, and another specified process, that is, a process such as closing the drain valve 18 is executed. Next, in Step P13, it is determined whether or not an end command has been issued. The process returns to step P1 until the end command is issued, and returns to the main routine when the end command is issued.

As described above, in the above embodiment, the washing water in the outer tub 4 after the washing process is not completely drained, but the cold water supply valve 16 is opened to supply tap water (cold water) introduced from the outside to the outer tub. Since the cool down step of mixing with the washing water of 4 is provided, it is possible to lead the clothes after the washing step to the rinsing step more linearly while maintaining a constant temperature gradient, as compared with the conventional cool down step.

Further, since the entire clothes are not temporarily brought into contact with the outside air due to the complete dehydration of washing water as in the conventional case, the ambient temperature of the outer tub 4 is lower than the temperature of tap water (cold water). Even if the temperature of clothes does not drop suddenly. Therefore, the stable cool down process is executed without being affected by the conditions such as the ambient air temperature and the water temperature.

While the cold water supply valve 16 is opened and tap water (cold water) introduced from the outside is supplied, at the same time, the agitating blade 25 is agitated and rotated by the drive of the motor 26 to wash the wash water of the outer tub 4 composed of hot water and cold water. Since it is configured to mix cold water with, it is possible to shorten the time of the cool down process.

Further, in the cool down step, since the cold water is supplied to a water level higher than the initial water level in the washing step, it is possible to prevent the clothes which have been permanently pressed from wrinkling due to washing. Further, since only cold water is supplied in the cool down step, the cost for supplying hot water is reduced as compared with the conventional case.

On the other hand, since the washing machine 1 of the present invention is provided with the water level sensor 21 of the outer tub 4 connected to the hot water supply valve 15, the cold water supply valve 16 and the like, the water level can be set with high accuracy. . This is because, in a conventional washing machine equipped with timer-type hot water and cold water supply valves, the set water level for the washing tub is not stable due to fluctuations in the water pressure of the external hot water supply / water supply source.

In the above embodiment, the cold water is supplied to a water level higher than the initial water level in the washing step, which is preset in the cool down step. However, the temperature of the cold water supplied here is set to the thermistor 22 or the like. The control unit may be configured to include a program for calibrating with the water temperature sensor and determining the supply amount of cold water suitable for executing the linear temperature decrease by comparing with the water temperature of the washing water in the washing process.

[0053]

In the washing machine according to the present invention, cold water is supplied to the washing water in the washing tub in the cool down step after the washing step. At this time, since the cold water is supplied while stirring the washing water in the washing tub, the washing water in the washing tub and the cold water are uniformly mixed in a shorter time than conventional. Therefore, it is possible to shorten the time of the cool down process.

Further, since the washing water in the washing tub after the washing step is not completely drained, but the cold water introduced from the outside is supplied and mixed with the washing water in the washing tub, the washing water is washed as compared with the conventional cool down step. The garment after the process can be guided to the rinsing process with a more linear temperature decrease while maintaining a constant temperature gradient.

Further, since the entire clothes are not temporarily brought into contact with the ambient outside air due to the complete dehydration of the washing water as in the conventional case, even when the ambient temperature of the washing tub is lower than the temperature of the cold water, the washing is sudden. Does not cause clothing temperature drop. Therefore, the stable cool down process is executed without being affected by the conditions such as the ambient air temperature and the water temperature. With such a configuration, the cool down step which is more effective than the conventional one is executed, and it is possible to prevent the clothes subjected to the permanent press work from being wrinkled due to washing. Further, since only cold water is supplied in the cool down step, the cost for supplying hot water can be reduced as compared with the conventional case.

[Brief description of drawings]

FIG. 1 is a sectional view of a washing machine according to an embodiment of the present invention.

FIG. 2 is a front view of an operation panel of the washing machine shown in FIG.

FIG. 3 is a schematic block diagram of the washing machine of FIG.

FIG. 4 is a control flowchart of the washing machine shown in FIG.

5 is a control flowchart of a standard mode of FIG.

FIG. 6 is a control flowchart of the rinsing / dewatering process of FIG.

7 is a control flowchart of a permanent mode of FIG.

8 is a control flowchart of the cool down process of FIG.

9 is a time chart of the cool down process of FIG.

[Explanation of symbols]

 1 Fully automatic washing machine 2 Equipment main body 4 Washing tub outer tub 5 Washing tub inner tub 9 Operation panel 15 Hot water supply valve 16 Cold water supply valve 17 Control part 21 Water level sensor 25 Stirring blade 26 Motor

Claims (1)

[Claims] 1. A washing machine having a function of washing clothes that have been permanently pressed, the washing water being supplied to a washing tub, the washing water consisting of hot water and cold water, or the initial level of the washing water consisting of only hot water. The initial water level setting step for setting the washing water, the washing water supply step for supplying the washing water to the initial water level, the washing step for washing the clothes in the washing tub to which the washing water is supplied, and the washing water in the washing tub after the washing step The cool-down process that lowers the temperature of the clothes by supplying cold water to gently cool the clothes, and the rinsing process that rinses the cooled clothes with cold water, the cool-down process is performed while stirring the washing water in the washing tub. A washing machine equipped with a stirring / cooling water supply operation for supplying cold water.