JP2006149614A - Washer-dryer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shorten time for a dehydrating process just before drying operation depending on the fabric quality of laundry articles. <P>SOLUTION: The fabric quality of laundry articles is judged (S4) from the result of weight detection (S1) before washing operation of the laundry articles and the result of weight detection (S6) in a state of containing water in the laundry article. When the fabric quality of the laundry articles is judged to have low absorbing property as the result, the dehydrating process just before the drying operation is controlled to obtain a high spin-dry ratio in a short time (S25 to S30). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a washing / drying machine with improved execution of a dehydration process immediately before a drying operation.

  2. Description of the Related Art Conventionally, a laundry dryer includes a tub for storing laundry, a driving device that rotationally drives the tub, and a warm air supply device that supplies warm air to the interior of the tub, and washing the laundry. It is possible to execute from the operation to the drying operation for drying.

  In this case, in the dehydration process immediately before the drying operation, if the rotation speed of the tank is rapidly increased to the maximum speed without taking a rest, the laundry strongly sticks to the inner peripheral surface of the tank due to the centrifugal force generated by the rotation of the tank. When the drying operation is performed in this state, there is little contact of warm air with the laundry, and the warm air may contact only the inner peripheral surface portion of the laundry attached to the inner peripheral surface of the tub. Furthermore, since many wrinkles are attached to the laundry and the hot air is obstructed by the laundry, the laundry is not effectively and efficiently dried.

For this reason, in the dehydration process immediately before the drying operation, the tank is rotated to the rotational speed immediately before the laundry is stuck to the inner peripheral surface, and then stopped, and then the ultra-low speed rotation is performed to peel the laundry from the inner peripheral surface. Then, the rotation speed is increased to the rotation speed immediately before the laundry is stuck to the inner peripheral surface, and then the rotation is stopped and then the ultra-low speed rotation is repeated. A method of increasing in a stepwise manner (for example, five steps) with an ultra-low speed rotation interposed therebetween has been adopted.
JP 2001-212394 A

  However, the conventional apparatus has a problem that it takes a long time for the dehydration process immediately before the drying operation.

  The present invention has been made in view of the above circumstances, and therefore, an object of the present invention is to provide a washing / drying machine that can shorten the time required for the dehydration process immediately before the drying operation depending on the quality of the laundry.

  In order to achieve the above object, the washing and drying machine of the present invention comprises a tub for storing laundry, a driving device for rotationally driving the tub, and a hot air supply device for supplying hot air to the inside of the tub. In addition, in a thing that can be executed from a washing operation for washing the laundry to a drying operation for drying, the weight detection means for detecting the weight of the laundry, the weight detection result of the laundry before the washing operation, and the laundry containing water And a cloth quality determining means for determining the cloth quality of the laundry from the weight detection result in the state of being washed, and it is determined from the cloth quality determination result that the cloth quality of the laundry is low in water absorption. And a control means for controlling the dehydration process immediately before the drying operation so as to obtain a high dehydration rate in a short time.

According to the inventor's experiment, the following was found. That is, the laundry that tends to stick to the inner peripheral surface of the tub during the dehydration operation is a fabric having high water absorption, such as cotton. On the other hand, the laundry that does not easily stick to the inner peripheral surface of the tub during the dehydration operation has a low water absorption and is, for example, a synthetic fiber. Among these, since the latter is difficult to stick to the inner peripheral surface of the tank in the dehydration operation, it is not necessary to adopt a conventional operation method for preventing the latter from sticking.
In addition, the judgment of whether the laundry is a fabric with high water absorption or low water absorption can be made by comparing the weight of the laundry before and after water absorption (weight difference). The smaller the is, the smaller the amount of water absorption, and thus the lower the water absorption.

  Therefore, as described above, the laundry cloth quality is determined from the weight detection result before the washing operation of the laundry and the weight detection result in a state in which the laundry is wet. By controlling the dehydration process immediately before the drying operation so as to obtain a high dehydration rate in a short time when it is determined that the property is small, the time required for the dehydration process immediately before the drying operation can be shortened. Further, in this case, since the laundry is difficult to stick to the inner peripheral surface of the tub during the dehydration operation, the effect of performing subsequent drying effectively and efficiently is not impaired.

Hereinafter, a first embodiment (first embodiment) of the present invention will be described with reference to FIGS.
First, FIG. 2 shows the entire drum-type washing and drying machine as viewed from the longitudinal side. A water tank 2 is elastically supported by a suspension 3 in the outer box 1, and inside the water tank 2. The drum 4 is rotatably arranged. A bellows 7 is provided at the front portion of the water tub 2 to connect the laundry passage port 5 formed on the front of the water tank 2 and the laundry entrance / exit 6 provided on the front surface of the outer box 1. 6 is a tub for storing the laundry put in through the bellows 7 and the laundry through-opening 5, and in this case, it is supported in a horizontal axis shape in which the axial direction is front and rear, and in an upwardly inclined shape.

The laundry doorway 6 is provided with a door 8 for opening and closing the laundry doorway 6. On the other hand, a motor 9 is provided on the back of the water tub 2 as a driving device for driving the drum 4 to rotate.
In addition, a dehumidifier 10 is provided on the back of the water tank 2, and an air duct 13 having a blower 11 and a heater 12 in the middle is provided above the water tank 2. 4) is circulated, and is dehumidified by the dehumidifier 10 in the middle, heated by the heater 12 to be warmed and returned to the water tank 2 (in the drum 4). Therefore, they constitute a hot air supply device 14 for supplying hot air into the drum 4.
In addition, below the water tank 2, a drain pipe 15, a filter device 16, and a drain valve 17 for discharging the water in the water tank 2 to the outside of the apparatus are disposed.

  Next, FIG. 3 is a block diagram showing the electrical configuration of the drum-type washing and drying machine, and the microcomputer 18 that forms the core of the drum-type washing and drying machine detects the weight of the laundry as will be described in detail later. It functions as a means, functions as a cloth quality judging means for judging the cloth quality of the laundry, and functions as a control means for controlling the operation of the drum type washing and drying machine.

  The microcomputer 18 receives various operation signals from a switch input unit 19 including various operation switches of an operation panel (not shown), and a rotation sensor 20 that detects the rotation of the motor 9 and the rotation of the drum 4. A rotation detection signal is input, a water level detection signal is input from a water level sensor 21 provided so as to detect the stored water level in the water tank 2, and a temperature sensor provided so as to detect the temperature of air discharged from the water tank 2, for example. A temperature detection signal is input from 22.

  Then, based on those inputs and a control program stored in advance, the microcomputer 18 includes a display unit 23 composed of various displays included in the operation panel, and a water supply valve 24 provided to supply water into the water tank 2. , The motor 9, the drain valve 17, the water injection valve 25 of the dehumidifier 10 (the dehumidifier 10 in this case is water cooling that cools and dehumidifies the air in the drum 4 entering from the water tank 2 with water injected from the water injection valve 25 Drive control signal is given to the drive circuit 26 for driving the blower 11 and the heater 12.

Next, the operation of the above configuration will be described.
FIG. 1 shows the control contents of the standard course by the microcomputer 18. When the standard course is selected by the user and the “start” switch is operated, the microcomputer 18 starts the control operation (start). First, the weight of the laundry before containing water contained in the drum 4 is detected (step S1). As shown in FIG. 4, the weight detection is performed by rotating the motor 9 (drum 4) with a predetermined input and accelerating the required time T1 until the rotational speed increases from 100 [rpm] to 250 [rpm], for example. After that, when the motor 9 (drum 4) continues to rotate due to inertia while the input to the motor 9 is turned off, the deceleration required time T2 until the rotational speed drops from 250 [rpm] to 100 [rpm]. Thus, for example, it is determined that the greater the calculated value, the greater the weight.

Thereafter, the microcomputer 18 opens the water supply valve 24 to supply water at a predetermined water level into the water tank 2 (step S2). At the time of this water supply, the detergent put in a detergent charging case (not shown) is washed away with the water supply and supplied into the water tank 2.
Thereafter, the microcomputer 18 executes a washing process by alternately rotating the drum 4 in both forward and reverse directions by the motor 9 (step S3).

Then, drainage from the water tank 2 is performed by opening the drain valve 17 (step S4), and then the dehydration is performed by rotating the drum 4 in one direction by the motor 9 while the drain valve 17 is opened. A process is executed (step S5).
FIG. 5 shows the situation at this time, and the rotational speed of the drum 4 (motor 9) is increased to 900 [rpm]. Thereafter, the weight of the wet laundry is detected by the same method as in step S1 (step S6).

Thereafter, water is supplied in the same manner as in step S2 (step S7), and thereafter, a first rinsing process similar to the washing process in step S3 is executed (step S8), and drainage is performed in the same manner as in step S4 (step S9). .
And after that, the dehydration process (step S10) similar to the dehydration process of step S5, the water supply similar to step S7 (step S11), the second rinse process similar to step S8 (step S12), and the drainage similar to step S9. Execute (Step S13).

  Thereafter, the microcomputer 18 determines the quality of the laundry (determination as to whether or not the fabric has low water absorption) (step S14). The determination of the fabric quality is based on the weight detection result in step S1 and the weight detection result in step S6. The greater the difference in the detected weight, the greater the amount of water absorption (water content). It is a fabric with high water absorption, such as cotton. On the other hand, the smaller the difference in the detected weight, the smaller the water absorption (water content), so the fabric is less water-absorbing, and is, for example, synthetic fiber.

  If it is determined in step S14 that the fabric is not water-absorbing (NO), the process proceeds to the dehydration process immediately before the drying operation. The dehydration process immediately before the drying operation is performed by dividing the dehydration into, for example, five stages (steps S15, S17, S19, S21, and S23), and the dehydration is performed in order to efficiently perform the subsequent drying operation. This is performed by rotating the drum 4 in one direction while supplying the warm air into the drum 4 by the warm air supply device 14 and keeping the drain valve 17 open. This is called first to fifth preheat dehydration. Yes.

  Thus, in this case, the rotation speed of the drum 4 is up to 400 [rpm] immediately before the laundry (cloth with high water absorption) immediately after drainage sticks to the inner peripheral surface of the drum 4 in the first preheat dehydration. Yes, in the second preheat dehydration, the laundry dehydrated in the first preheat dehydration is until 600 [rpm] immediately before the laundry dehydrated in the first preheat dehydration sticks to the inner peripheral surface of the drum 4, and in the third preheat dehydration, the laundry dehydrated in the second preheat dehydration. In the fourth preheat dehydration, the laundry dehydrated in the third preheat dehydration is up to 1200 [rpm] just before the article sticks to the inner peripheral surface of the drum 4. The fifth preheat dehydration is up to 1400 [rpm] immediately before the laundry dehydrated by the fourth preheat dehydration sticks to the inner peripheral surface of the drum 4. Each of these required times is 5 [minutes].

  Further, in this case, after each preheat dehydration, the drum 4 is rotated at an ultra-low speed of, for example, 20 [rpm], thereby performing cloth peeling for peeling the laundry from the inner peripheral surface of the drum 4 (step S16). , S18, S20, S22, S24).

  On the other hand, if it is determined in step S14 that the fabric is low in water absorption (YES), the process proceeds to the dehydration process immediately before the drying operation. However, in this case, the dehydration process immediately before the drying operation is performed in three stages (steps S25, S27, S29), for example, where the dehydration is smaller than the above. In order to perform well, it is performed by rotating the drum 4 in one direction while supplying the warm air into the drum 4 by the warm air supply device 14 and keeping the drain valve 17 open. This is called preheat dehydration.

  Thus, in this case, the rotation speed of the drum 4 is up to 400 [rpm] immediately before the laundry immediately after drainage (regardless of water absorption) sticks to the inner peripheral surface of the drum 4 in the first preheat dehydration. However, in the second preheat dehydration, when the laundry dehydrated in the first preheat dehydration has a fabric with high water absorption, it adheres to the inner peripheral surface of the drum 4 but has a low water absorption. In the case of the third preheat dehydration, the laundry dehydrated by the second preheat dehydration until the high dehydration rate of 900 [rpm] is obtained immediately before sticking to the inner peripheral surface of the drum 4. 1400, which sticks to the inner peripheral surface of the drum 4 when it is of a high quality, but immediately before it sticks to the inner peripheral surface of the drum 4 when it has a low water-absorbing property. rpm) That. In addition, the respective required times are 5 [minutes] for the first preheat dehydration and 10 [minutes] for the second preheat dehydration and the third preheat dehydration.

Furthermore, in this case, after each preheat dehydration, the drum 4 is rotated at an ultra-low speed of, for example, 20 [rpm], thereby performing cloth peeling for peeling the laundry from the inner peripheral surface of the drum 4 (step). S26, S28, S30).
As a result, a high dehydration rate can be obtained in a short time.

  And after step S24 and step S30, the weight detection similar to step S1, S6 is performed (step S31), and the drying process in a drying operation is performed based on the detection result (step S32). This drying process is performed by supplying warm air into the drum 4 by the warm air supply device 14 while reciprocatingly rotating the drum 4 in both forward and reverse directions.

  Thereafter, when drying of the laundry is detected based on the detection result of the temperature sensor 22 (step S33), a finishing drying process is performed in which the same operation as the above drying process is continued for a predetermined time (step S34). The entire operation is completed through a cooling step (step S35) in which the drum 4 is reciprocally rotated in both forward and reverse directions and the cool air is supplied into the drum 4 by the hot air supply device 14 that does not operate the heater 12.

  As described above, in the present configuration, the laundry cloth quality is determined from the weight detection result before the washing operation of the laundry and the weight detection result in a state where the laundry is wet, and as a result, the laundry cloth quality is determined. When it is determined that the water absorption is low, the dehydration process immediately before the drying operation is controlled so that a high dehydration rate can be obtained in a short time.

  This is because the laundry that easily sticks to the inner peripheral surface of the drum 4 in the dehydration operation is a fabric having high water absorption, while the laundry that does not easily stick to the inner peripheral surface of the drum 4 in the dehydration operation absorbs water. It is based on what has been found by the inventor's experiment that the fabric has a small fabric quality, of which the latter is difficult to stick to the inner peripheral surface of the tank in the dehydration operation. There is no need to adopt the conventional driving method.

  Therefore, as described above, the laundry cloth quality is determined from the weight detection result before the washing operation of the laundry and the weight detection result in a state in which the laundry is wet. When it is determined that the dehydration process is small, the dehydration process immediately before the drying operation is controlled so that a high dehydration rate can be obtained in a short time. Time can be shortened. Further, in this case, the laundry is difficult to stick to the inner peripheral surface of the drum 4 in the dehydration operation, and therefore, the effect of performing subsequent drying effectively and efficiently is not impaired.

  6 to 12 show the second to seventh examples (second to seventh embodiments) of the present invention. The same reference numerals are given to the same parts as those of the first example. A description will be omitted, and only different parts will be described.

[Second Embodiment]
In the second embodiment shown in FIG. 6, dehydration is performed in less than the above-mentioned five stages in the dehydration process immediately before the drying operation when it is determined in step S14 that the fabric is not water-absorbing (NO). For example, it is performed in three stages (steps S15, S17, S19) (first, second, and third preheat dehydration). In this case, the cloth peeling after each preheat dehydration is performed three times (steps S16, S18, S20).
By doing in this way, even if the cloth quality of the laundry has high water absorption, the time required for the dehydration process immediately before the drying operation can be shortened.

[Third embodiment]
In the third embodiment shown in FIG. 7, the dehydration is performed in the dehydration process immediately before the drying operation when it is determined in step S <b> 14 that the fabric quality is not low in water absorption (NO). The steps (steps S15, S17, and S101) are performed (first, second, and third preheat dehydration). In this case, the rotation speed of the drum 4 in the third preheat dehydration (S101) is set to 1000 [rpm]. Furthermore, also in this case, the cloth removal after each preheat dehydration is performed only three times (steps S16, S18, and S20) in accordance with the execution of the above three stages of preheat dehydration.

On the other hand, the rotation speed of the drum 4 in the second preheat dehydration (S102) is set to 600 in the dehydration process immediately before the drying operation when it is determined in step S14 that the fabric has low water absorption (YES). The rotation speed of the drum 4 in the third preheat dehydration (S103) is set to 1000 [rpm].
Even in this case, the time required for the dehydration process immediately before the drying operation can be shortened regardless of whether the laundry fabric has a high water absorption or a small water quality.

  It should be noted that the weight detection in the state where the laundry is wet is not performed immediately after the end of the dehydration process (step S6) immediately after the washing process (step S3) during the washing operation, but is performed immediately after the rinsing process (step S8). It may be performed immediately after the end of the process (step S10). In any of these cases, since the dehydration of the laundry is executed as specified, the laundry is evenly distributed in the drum 4 and is positioned with a good balance of rotation. Therefore, the subsequent weight detection of the laundry can be performed with high accuracy.

  In addition, the weight detection in the state of moisture of the laundry is performed immediately after the completion of all the dehydration steps during the washing operation, and the quality of the laundry is determined by taking, for example, an average value from the total detection results. By doing so, the weight detection of the laundry can be performed more accurately and without variations.

[Fourth embodiment]
In the fourth embodiment shown in FIGS. 8 and 9, the weight detection in the state where the laundry is wet is performed immediately after the completion of all the dehydration steps (steps S5 and S10) during the washing operation (step S6, S202), the maximum dehydrating rotation speed in each dehydrating process is made different. Specifically, in the dehydration process (step S5) immediately after the washing process (step S3), the rotational speed of the drum 4 is set to 900 [rpm], whereas the dehydration process (step S8) immediately after the rinse process (step S8). In step S10), the rotational speed of the drum 4 is set to 1200 [rpm].

  In this case, the quality of the laundry is determined from the result of the weight detection in step S1 and the result of the weight detection in step S6 (step S201), and the result of the weight detection in step S6. From the weight detection result in step S202, the cloth quality of the laundry is determined (step S203).

  FIG. 9 shows the determination result. When the difference between the weight detection result B in step S6 and the weight detection result A in step S1 is less than a predetermined value in step S201, washing is performed. It is determined that the fabric quality of the article is low in water absorption, and if it is equal to or greater than a predetermined value, the laundry quality is determined to be high in water absorption. In addition, when the difference between the weight detection result C in step S202 and the weight detection result B in step S6 is less than a predetermined value in step S203, the laundry fabric has low water absorption. When it is determined and the value is equal to or greater than the predetermined value, it is determined that the cloth quality of the laundry has high water absorption.

  Thus, the accuracy of the cloth quality determination can be improved by performing the weight measurement of the laundry a plurality of times under different conditions (dehydration rotation speed) and thereby performing the determination of the cloth quality of the laundry a plurality of times. . In this case, if the first determination result is different from the subsequent determination result, the latter determination result is assumed to be correct, and the subsequent steps are advanced accordingly.

[Fifth embodiment]
In the fifth embodiment shown in FIGS. 10 and 11, the weight detection in a state where the laundry is wet is performed immediately after the completion of all the dehydration steps (steps S5 and S302) during the washing operation (step S6, In S202), when the weight detection result immediately after the end of the first dehydration process is equal to or less than a predetermined value, the dehydration rotation speed in the second and subsequent dehydration processes is changed.

  Specifically, in this case, as shown in FIG. 11, in step 301 instead of step S201, the difference between the weight detection result B in step S6 and the weight detection result A in step S1 is a predetermined value. If it is above, the cloth quality of the laundry is determined to be high in water absorption, but if it is less than the predetermined value, it is determined that the laundry detected in step S1 has already contained water, and thus determination is not made.

  If the determination is not made, the rotation speed of the drum 4 is increased to 1200 [rpm] in step S302 instead of step S10, and if it is determined that the laundry fabric has high water absorption, step S302 is performed. Then, the rotational speed of the drum 4 is kept up to 900 [rpm].

  Further, in step S303 instead of step S203, as shown in FIG. 11, when the difference between the weight detection result D in step S202 and the weight detection result B in step S6 is less than a predetermined value, The cloth quality of the laundry is determined to be low in water absorption, and if it is equal to or greater than a predetermined value, it is determined that the cloth quality of the laundry is high in water absorption.

  As described above, the weight measurement of the laundry is performed a plurality of times with different conditions (dehydration rotation speed) according to the first determination result, thereby further determining the cloth quality of the laundry. Accuracy can be increased. In this case as well, if the first determination result is different from the subsequent determination result, the latter determination result is assumed to be correct, and the subsequent steps are advanced accordingly.

[Sixth embodiment]
In the sixth embodiment shown in FIG. 12, the weight of the laundry in the water-containing state is detected by the rate of change of the dehydration rotational speed in the end deceleration period of the dehydration process executed in the washing operation. Specifically, after the motor 9 is disconnected in the dehydration process of the previous steps S6, S10, and S302, the rotation speed when the drum 4 continues to rotate due to inertia is, for example, from 300 [rpm] to 200 [rpm]. The deceleration required time T11 until it descends is measured, and the weight of the laundry in the water-containing state is determined from the measurement result (the longer the deceleration required time T11 is, the greater the weight of the laundry in the water-containing state).

By doing in this way, the detection of the weight in the water-containing state of the laundry can be performed during the dehydration process, and the required time can be shortened compared to the case where it is separately performed.
In this case, the time T11 may be constant, and the amount of change in the rotational speed of the drum 4 within the time 11 may be measured.

[Seventh embodiment]
In the seventh embodiment shown in FIG. 13, the weight of the laundry in the wet state is detected by the rate of change of the dehydration rotation speed in the low speed region immediately before the stop during the final deceleration period of the dehydration process executed in the washing operation. Like to do. Specifically, after the motor 9 is de-energized in the dehydration process of the previous steps S6, S10, and S302, when the drum 4 continues to rotate due to inertia, the rotation speed is, for example, from 50 [rpm] to where it has stopped. The deceleration required time T21 is measured, and the weight of the laundry in the water-containing state is determined from the measurement result (the longer the deceleration required time T21 is, the greater the weight of the laundry in the water-containing state).

By doing so, the required time can be shortened as described above, and in particular, the weight of the laundry in a wet state is detected in a region where the centrifugal force applied to the laundry is small. The more cloth-like laundry that is less likely to stick to the inner circumferential surface, the more away from the inner circumferential surface of the drum 4, the less the rotational load, and the more the weight changes. Thus, more accurate detection can be performed.
In this case as well, the time T21 may be constant, and the amount of change in the rotational speed of the drum 4 within the time 11 may be measured.

  In addition, the present invention is not limited to the embodiments described above and shown in the drawings. For example, as a whole washing / drying machine, a vertical axis type can be applied in the same manner as the drum type. The present invention can be implemented with appropriate modifications within the scope not departing from the gist.

Flow chart of the standard course showing the first embodiment of the present invention Longitudinal side view of the entire washer / dryer Electrical configuration block diagram The figure which shows the weight detection method of the laundry The figure which shows the weight detection timing of the laundry FIG. 1 equivalent view showing a second embodiment of the present invention. FIG. 1 equivalent view showing a third embodiment of the present invention. FIG. 1 equivalent view showing a fourth embodiment of the present invention. The figure which shows the cloth quality judgment contents of the laundry FIG. 1 equivalent view showing a fifth embodiment of the present invention. Fig. 9 equivalent FIG. 4 equivalent view showing the sixth embodiment of the present invention FIG. 4 equivalent view showing the seventh embodiment of the present invention

Explanation of symbols

In the drawings, 4 is a drum (tank), 9 is a motor (drive device), 14 is a hot air supply device, and 18 is a microcomputer (weight detection means, cloth quality determination means, control means).

Claims (6)

A tub for storing the laundry, a driving device for rotating the tub, and a hot air supply device for supplying hot air to the tub. The washing operation for washing the laundry can be carried out to a drying operation. In what
Weight detection means for detecting the weight of the laundry;
A cloth quality determining means for determining the cloth quality of the laundry from the weight detection result of the laundry before the washing operation and the weight detection result in a state where the laundry is wet;
Control means for controlling the dehydration process immediately before the drying operation so that a high dehydration rate can be obtained in a short time when it is determined from the cloth quality determination result that the fabric quality of the laundry is low in water absorption. A washing and drying machine comprising:   The weight detection in a state in which the laundry is wet is performed immediately after the end of the dehydration process immediately after the washing process during the washing operation, or immediately after the end of the dehydration process immediately after the rinsing process. Washing and drying machine.   The weight detection in a state where the laundry is wet is performed immediately after completion of all the dehydration processes performed in the washing operation, and the cloth quality determination means determines the cloth quality of the laundry from all the detection results. The washing / drying machine according to claim 1.   4. The washing and drying machine according to claim 3, wherein the maximum dewatering rotation speed is varied in all dewatering steps executed in the washing operation.   The dehydration rotation speed in the second and subsequent dehydration strokes is changed when the weight detection result immediately after the end of the first dehydration stroke performed in the washing operation is equal to or less than a predetermined value. Washing and drying machine. The laundry drying according to any one of claims 1 to 5, wherein the weight of the laundry in a wet state is detected by a rate of change of the dehydration rotation speed in the end deceleration period of the dehydration process executed in the washing operation. Machine.

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