JP6964431B2 - Drum type washing machine and drum type washer / dryer - Google Patents

Description

The present invention relates to a drum-type washing machine that performs washing and dehydration and a drum-type washer-dryer that performs washing, dehydration and drying.

In a drum-type washing machine, the housing contains an outer tub for storing water, and the outer tub contains a drum for putting clothes in, and each process of washing, rinsing, and dehydration is performed. In the low-speed rotation speed range at the beginning of the dehydration process, clothes are attached to the drum while gradually increasing the rotation speed of the drum, and unbalance is detected by an unbalance detection means for determining the imbalance of the clothes attached to the drum. If it is determined that the balance is less than the set threshold, the number of revolutions of the drum is increased. If it is determined that the imbalance is greater than the threshold value, the drum rotation is stopped or the rotation speed is reduced to correct the imbalance. The size of the imbalance changes depending on the method of attachment, the material of the clothing, and the combination.

Japanese Patent No. 4961195 (Patent Document 1) is a conventional technique for detecting imbalance and modifying it. In this publication, the number of revolutions of the drum is increased in three stages, maintained at the first number of revolutions for a predetermined time, then increased from the first number of revolutions to the second number of revolutions, and at the second number of revolutions. It is maintained for a predetermined time, further increased from the second rotation speed to the third rotation speed, and controlled to be maintained for a predetermined time at the third rotation speed, the imbalance is detected by the imbalance detecting means, and the first rotation speed is detected. If the imbalance detected in step 1 is larger than the first threshold value, the number of revolutions is lowered to the first number of revolutions or less, the number of revolutions is increased to the first number of revolutions again to detect the imbalance, and the number of revolutions is detected at the second number of revolutions. If the imbalance is greater than the second threshold, the number of revolutions is lowered below the first number of revolutions, and the number of revolutions is increased again to the first number of revolutions to detect the imbalance. If it is larger than the third threshold value, it is described that the control is performed so that the rotation is temporarily stopped and restarted before the first rotation speed.

Japanese Patent No. 4961195

In recent years, the washing capacity has been increased, and it has become possible to wash a combination of a plurality of large clothes such as blankets. When a plurality of blankets are combined, the volume occupied by the blanket becomes larger than the volume of the drum, and it becomes difficult for the blanket to spread on the inner peripheral surface of the drum. Therefore, imbalance is likely to occur when blankets overlap each other or a part of blankets overlap. In particular, when blankets made of different materials are combined, the ease of water content differs depending on the material, and as a result, a weight difference occurs when the compress contains water from the washing process and rinsing process, resulting in a large imbalance. Cheap.

Patent Document 1 corrects the imbalance by stopping the rotation of the drum or reducing the rotation speed when the imbalance becomes larger than the threshold value. However, since the method of correcting the imbalance at the time of pasting is not considered, when blankets made of different materials that cause a difference in the weight of the compress are combined, a large imbalance is likely to occur at the time of pasting. When a large imbalance occurs, the number of times the imbalance is corrected increases, which increases the dehydration time and power consumption. In the worst case, the dehydration may not be completed and the operation may end.
When performing the dehydration process by combining blankets made of different materials, it is necessary to increase the number of rotations while correcting the imbalance before the blankets stick to the drum, and then stick the blankets to the drum.

In order to solve the above problems, the washing machine of the present invention includes a rotatable drum whose rotation axis is horizontal or inclined so that the back side is downward, and an outer tub that includes the drum and stores washing water. The housing including the outer tub, the means for determining the sticking state of the laundry in the drum, and the means for determining the imbalance are provided, and the first dehydration operation is determined by the means for determining the sticking state of the clothes. The unbalance determination means is used to make a determination, and the unbalance determination means is used to make a determination while the rotation speed of the drum with the clothes attached is maintained for a predetermined time. When the balance is larger than the threshold value of the unbalance determination means, the rotation control of the second and subsequent dehydration operations for starting dehydration again is set from the determination of the sticking state of the laundry in the first dehydration operation, and the dehydration is performed. After the second operation, the unbalance determination means makes a determination while maintaining the rotation speed lower than the rotation speed of the drum in the state where the clothes are stuck for a predetermined time, and the rotation control is different from that of the first dehydration operation. And.

According to the present invention, in the low speed range of the dehydration process, by attaching clothes while correcting the imbalance, the correction time of the imbalance can be reduced when large clothes such as blankets or blankets made of different materials are combined. It is possible to provide a drum-type washing machine and a drum-type washer-dryer that can be shortened and suppress an increase in dehydration time and power consumption.

It is a perspective view of the drum type washing machine which concerns on embodiment of this invention. It is a central sectional view seen from the right side surface of the internal structure of the drum type washing machine which concerns on embodiment of this invention. It is a flowchart of the dehydration process in 1st Example. It is a schematic diagram which shows the sticking of the blanket in the low-speed rotation speed range in the 1st Example. It is a schematic diagram which shows the imbalance determination method of the 1st to 3rd dehydration in the 1st Example. It is a flowchart of the dehydration process in 2nd Example.

Hereinafter, examples of embodiments for carrying out the present invention will be described with reference to the drawings. The vertical direction, the horizontal direction, and the front-rear direction are the directions shown in FIG.

(Example 1)
FIG. 1 is a perspective view of the drum-type washing machine 100 according to the present invention, and FIG. 2 is a side view showing the internal structure of the drum-type washing machine 100. The configuration and operation of the drum-type washing machine 100 will be described with reference to FIGS. 1 and 2.

The housing 1 constituting the outer shell of the drum-type washing machine 100 shown in FIG. 1 is mounted on the base 1a, and has left and right side plates 1b (only the right side plate is shown in FIG. 1), a front cover 1c, and a back surface. It is composed of a cover 1d (see FIG. 2), a top cover 1e, and a lower front cover 1f. The top cover 1e is provided with a water supply hose connection port 30 for supplying water to the drum-type washing machine 100 from the water tap. The housing 1 forms a box-shaped outer frame including the base 1a, and has sufficient strength as the outer frame.

The door 2 is provided at substantially the center of the front cover 1c to close an insertion port (not shown) for taking in and out clothes, and is supported by a hinge provided on the front cover 1c so as to be openable and closable. The door 2 is opened by pulling the door opening handle 2a to disengage the lock mechanism (not shown), and is locked and closed by pressing the door 2 against the front cover 1c. The front cover 1c has a circular opening for putting in and taking out clothes substantially concentrically with the opening of the outer tank 11 (see FIG. 2) described later.

A detergent container 12 for charging detergent is provided on the upper part of the housing 1. Further, the operation / display panel 3 provided on the upper part of the housing 1 includes a power switch 4, an operation switch 5, and a display 6. The operation / display panel 3 is electrically connected to the control device 7 (see FIG. 2) provided in the upper reinforcing member 13a (see FIG. 2) provided on the upper part of the housing 1. A cooling fan (not shown) is attached to the control device 7. A drain hose 14 for draining water is attached in the vicinity of the base 1a.

An outer tub 11 for storing water is provided inside the housing 1 of the drum-type washing machine 100 shown in FIG. The front of the outer tub 11 has a tapered portion in order to secure a space between the housing 1 and the outer tub 11 when the washing capacity is increased. The lower part of the outer tank 11 is vibration-proof supported by a pair of left and right suspensions 26 (composed of a coil spring and a damper) fixed to the housing 1.

Two sets of suspending means (composed of coil springs) are connected to the upper portion of the outer tub 11 in order to prevent the outer tub 11 from falling in the front-rear direction. One end of the first suspension means 8 is connected to the outer tank side front spring holder 10a provided in front of the outer tank 11, and the other end of the first suspension means 8 is the housing side provided in the front reinforcing member 13. It is configured by connecting to the front spring holder 10.

One end of the second suspension means 9 is connected to the outer tank side rear spring holder 10c provided behind the outer tank side front spring holder 10a, and the other end of the second suspension means 9 is on the outer tank side. It is configured by connecting to the housing-side rear spring holder 10b provided behind and above the rear spring holder 10c.

By using a high-strength resin such as polypropylene or fiber reinforced plastic as the material for the outer tank side front spring holder 10a, the housing side front spring holder 10, the outer tank side rear spring holder 10c, and the housing side rear spring holder 10b, the spring holder Even if a force is applied from the suspension means, the spring holder has strength, so that the spring holder can be prevented from being damaged.

The outer tank 11 includes a drum 21 for storing clothes. A motor 22 for rotating the drum 21 is provided behind the outer tank 11. In the motor 22, a shaft 22a serving as a rotation shaft penetrates the outer tank 11 and is coupled to the drum 21. When the motor 22 is driven, the drum 21 is rotationally driven in both forward rotation (clockwise when the drum type washing machine 100 is viewed from the front) and reverse rotation (counterclockwise when the drum type washing machine 100 is viewed from the front). .. The rotation axis Az of the drum 21 shown in FIG. 2 is inclined from the front to the rear of the drum type washing machine 100 so as to be horizontal or the back side is downward (FIG. 2 is inclined so that the back side is downward). doing).

On the inner peripheral surface of the drum 21, a plurality of dehydration holes 21b for draining the washing water in the drum 21 to the outer tub 11 and a plurality of dehydration holes 21b are put into the drum 21 at intervals in the circumferential direction of the drum 21. A plurality of baffles 23 (only one is shown in FIG. 2) for lifting clothes are provided. The baffle 23 extends in the front-rear direction of the drum 21.

A cylindrical fluid balancer 21c is provided at the front end of the drum 21. The outer tank 11 forms a bottomed substantially cylinder with an opening at the front and a closure at the rear. The opening of the outer tank 11 and the inlet of the housing 1 are connected by a bellows 16 that easily expands and contracts in the front-rear direction. The bellows 16 is formed of an elastic elastomer or a synthetic rubber material which is an annular packing, and the drum 21 is water-sealed by closing the door 2. Further, the insertion port of the housing 1, the opening of the outer tank 11, and the opening of the drum 21 communicate with each other, and by opening the door 2, clothes can be taken in and out of the drum 21. The outer tank 11 can be divided into a side including an opening and a side to which the motor 22 is attached.

One end of the water supply hose 17 is connected to the outer tank 11 via a water supply valve 15 and a detergent container 12. By opening the water supply valve 15, washing water is supplied into the outer tub 11 from the water supply hose connection port 30.

The drain hose 14 provided in the lower part of the outer tub 11 is provided with a circulation pump 27, a lint filter 28, and a drain valve 14a in the drain path. By closing the drain valve 14a and supplying water, washing water is supplied to the outer tub 11. The reservoir and the drain valve 14a are opened to drain the washing water in the outer tub 11 to the outside of the machine.

A vibration sensor 18 for detecting the vibration amplitude of the outer tank 11 is provided below the outer tank 11, and when the value of the vibration sensor 18 exceeds a predetermined value set in advance, the dehydration operation is stopped.

In the above configuration, the operation of the drum type washing machine 100 will be described. When the power switch 4 is pressed, the drum type washing machine 100 is activated. The operation is started by pulling the door opening handle 2a, opening the door 2, putting clothes into the drum 21, closing the door 2, and then operating the operation switch 5. When the operation is started, the drum 21 rotates to calculate the dry cloth weight of the clothes before water injection. The dry cloth weight of the clothes in the drum 21 is calculated based on the rotation speed and the current value of the motor 22. Based on the calculated dry cloth weight of clothes, the amount of detergent to be added is displayed on the display 6. After putting a predetermined amount of detergent into the detergent container 12, the washing process is started first. In the washing step, the water supply valve 15 is opened, and the water supplied from the water supply hose connection port 30 is supplied to the outer tank 11 together with the detergent via the water supply hose 17 and the detergent container 12. At this time, the undissolved detergent and water are vigorously agitated in the circulation pump 27, and the detergent can be efficiently dissolved to generate a high-concentration detergent solution. After executing this operation for a predetermined time, the drum 21 performs a washing operation of repeating forward rotation, stop, reverse rotation, and stop for a predetermined time. At this time, the clothes are lifted by the baffle 23 and fall. After performing the washing process, perform the dehydration process. The details of the dehydration process will be described later. First, the drain valve 14a is opened, and the water in the outer tub 11 is drained to the outside of the drum-type washing machine 100 via the drain hose 14. Next, the operation of attaching the clothes to the inner peripheral surface of the drum 21 is performed. The drum 21 is rotated in one direction at a low rotation speed (for example, 50 r / min), and clothes containing water are lifted by the baffle 23 when the drum 21 is rotated and spread on the inner peripheral surface of the drum 21 when the drum 21 is dropped. .. Next, the rotation speed of the drum 21 is gradually increased to attach clothing to the inner peripheral surface of the drum 21. When the clothing sticks to the inner peripheral surface of the drum 21, the rotation speed of the drum 21 is further increased, and the drum 21 passes through the resonance rotation speed of the outer tank 11 and the housing 1 while the drum 21 has a target rotation speed (for example, 900r /). min) is reached. After that, the drum 21 is rotated for a predetermined time to centrifuge and dehydrate the water contained in the clothes.

If the clothing attached to the inner peripheral surface of the drum 21 is offset and unbalanced, the vibration amplitude of the outer tank 11 at the time of the pulsation (rotational fluctuation) of the rotation speed of the drum 21 and the resonance rotation speed of the outer tank 11. Becomes larger. When the rotation fluctuation of the drum 21 or the vibration amplitude of the outer tank 11 is larger than the threshold value, the rotation speed of the drum 21 is reduced or stopped, and the drum 21 is repeatedly rotated forward and backward in order to correct the imbalance to be small. Correct the imbalance of clothing by loosening and injecting water.

After performing this dehydration step, the water supply valve 15 is opened, and the water supplied from the water supply hose connection port 30 is supplied into the outer tank 11 via the water supply hose 17 and the detergent container 12. After supplying water to the outer tank 11, a rinsing process is performed. In this rinsing step, the drum 21 repeats forward rotation, stop, inversion, and stop operations in the same manner as in the washing step described above. At this time, the rinsing operation is performed for a predetermined time by repeating the stirring operation in which the clothes lifted by the baffle 23 are dropped.

After that, the above-mentioned dehydration step and rinse step are repeated a predetermined number of times to shift to the final dehydration step. The dehydration time in this final dehydration step is set longer than that in the above-mentioned dehydration step.

The drum-type washer-dryer is equipped with a hot-air heater, a hot-air fan, etc. in the drum-type washing machine 100 (none of them are shown), and after the final dehydration process, while rotating the washing / drying drum at a lower speed than during washing. ， Blow warm air on the clothes to dry them.

Next, the details of the dehydration step will be described with reference to FIGS. 3, 4 and 5.

The dehydration operation can be divided into a low-speed rotation speed region before the resonance rotation speed of the outer tank 11 and a high-speed rotation speed region toward the resonance rotation speed and the target rotation speed of the outer tank 11.

First, the low-speed rotation speed range at the beginning of the dehydration process will be described. When the dehydration is started (200), the drum 21 is rotated in the normal direction to perform a loosening operation (201) for eliminating the deviation and entanglement of clothes. After the loosening operation (201), the rotation of the drum 21 is temporarily stopped (202), and the number of dehydrations is confirmed (203). In the case of the first dehydration performed immediately after the washing step or the rinsing step, the number of rotations of the drum 21 is constantly accelerated (for example, 3r / min) _{to the dehydration start rotation speed ω 0 (for example, 50r / min) while reversing the drum 21.} Raise (204) at / s) and lift the blanket (see FIG. 4A). When ω ₀ is reached, the detection of the sticking state of the blanket is started (205), and the blanket sticks to the inner peripheral surface of the drum 21 while spreading the blanket (see FIG. 4B) (see FIG. 4C). _{Raise it to 1} (for example, 80 r / min) (206) and detect the sticking state of the blanket between _{ω 0} and ω _1. When ω ₁ is reached, the detection of the sticking state is finished (207), the rotation speed of the sticking state is detected, and the unbalance correction rotation speed ω ₂ is set.

By _{setting ω 2} to a rotation speed that is 5r / min to 10r / min lower than the rotation speed at which the sticking state is detected, when the rotation speed of the drum 21 is increased, the sticking portion is maintained evenly. Only the unbalanced part can be expanded, and the blanket can be attached to the drum 21 while correcting the unbalanced part.

Here, the detection of the sticking state will be described. The sticking state is detected by rotation fluctuation, current, and vibration sensors. First, the detection of the sticking state due to the rotation fluctuation will be described. The rotation fluctuation is obtained from the difference between the maximum speed and the minimum speed during one rotation of the drum 21. When increasing the rotation speed of the drum 21 from ω ₀ to ω ₁ , if the blanket is not attached to the drum 21, the blanket falls from the drum 21 every time the drum 21 rotates, so that the drum 21 rotates once. The size of the imbalance changes each time. When the magnitude of the imbalance changes, the magnitude of the rotation fluctuation changes every time the drum 21 makes one rotation. When the rotation speed of the drum 21 increases and the blanket sticks to the drum 21, the blanket does not fall even if the drum 21 rotates. Therefore, when the blanket sticks to the drum 21, the size of the imbalance for each rotation of the drum 21 is less likely to change than before the blanket sticks to the drum 21, and the rotation fluctuates for each rotation of the drum 21. Is less likely to change. As described above, since the rotation fluctuation is obtained from the difference between the maximum speed and the minimum speed during one rotation of the drum 21, every rotation (for example, every two rotations) or every time (for example, every two seconds) of one or more rotations of the drum 21. ), The state in which the change in the magnitude of the rotation fluctuation becomes small is determined to be the state in which the blanket is stuck, and the number of rotations at that time is defined as the number of times in which the sticking state is detected.

Next, a method for detecting a sticking state due to an electric current will be described. As described above, when the blanket is not attached to the drum 21, the imbalance changes each time the drum 21 rotates. Therefore, the load applied to the motor 22 that rotates the drum 21 changes, so that the drum 21 moves. The change in current increases with each rotation. When the blanket sticks to the drum 21, the change in imbalance for each rotation of the drum 21 is smaller than that before the blanket sticks to the drum 21, so that the change in current for each rotation of the drum 21 becomes smaller. A blanket is used to compare the changes in the current for each rotation (for example, every two rotations) or for each time (for example, every two seconds) when the drum 21 makes one or more rotations, and to make the change in the current for each rotation of the drum 21 small. It is determined that the sticking state is attached, and the rotation speed at that time is taken as the rotation speed at which the sticking state is detected.

Next, a method of detecting the sticking state by the vibration sensor 18 will be described. When the vibration sensor detects the sticking state, the sticking state is detected by detecting vibration different from the periodic vibration generated by the rotation speed of the drum 21 (vibration due to the impact generated when the blanket falls). Can be detected. When the blanket does not stick to the drum 21, the blanket falls each time the drum 21 rotates, so that the vibration sensor 18 receives vibration due to the fall. However, when the blanket sticks to the drum 21, the blanket does not fall and vibrates. Vibration caused by dropping the blanket does not enter the sensor 18. Comparing the vibration sensors 18 at every rotation speed (for example, every two rotations) or every time (for example, every 2 seconds) when the drum 21 makes one or more rotations, the blanket is in a state where the vibration sensor 18 does not receive vibration due to the falling of the blanket. It is determined that the sticking is performed, and the rotation speed at that time is defined as the rotation speed at which the sticking state is detected.

After the rotational speed of the drum 21 has reached the omega _1, the omega ₁ and a predetermined time maintaining (208), performs the determination of the first unbalanced (209). The first unbalance determination (209) is performed based on the magnitude of the rotational fluctuation during the maintenance of _{ω 1 (208).} Since the rotation fluctuation is obtained from the speed difference when the drum 21 makes one rotation as described above, it is necessary to rotate the drum 21 once in order to determine the imbalance by the rotation fluctuation. Therefore, omega ₁ of the sustain time t _{1 (208)} is required to be longer than the time the drum 21 rotates once, in the present embodiment has given 80 r / min to omega _1, omega ₁ of the sustain time t ₁ (208) requires 0.75 seconds. More preferably, by setting the maintenance time t _{1 (208) of ω 1} to be larger than 0.75 seconds, it is possible to prevent erroneous determination of imbalance. If the _{imbalance of ω 1} is smaller than the first threshold value in the first imbalance determination (209), the rotation speed of the drum 21 is increased (210) to perform dehydration. If the _{imbalance of ω 1} is larger than the first threshold value in the first unbalance determination (209), the rotation speed of the drum 21 is stopped (214) and the imbalance is corrected (retry).

When the _{imbalance of ω 1} becomes larger than the first threshold value in the first imbalance determination (209), the blankets are not evenly spread on the drum 21 or the blankets are overlapped with each other, resulting in an imbalance. Since it is in a large state, the rotation of the drum 21 is stopped (214), and the blanket attached to the drum 21 is dropped. After stopping the rotation of the drum 21 (214), the loosening operation (201) is performed to eliminate the offset and entanglement of the blanket, thereby correcting the imbalance.

After the loosening operation, the rotation of the drum 21 is temporarily stopped (202), and the number of dehydrations is confirmed (203). If the first dehydration is a retry and the dehydration is performed again, the number of dehydrations will be the second and subsequent times. After the second dehydration, the rotation speed of the drum 21 is _{increased to ω 2} detected in the first dehydration (215), and ω ₂ is maintained for t ₂ seconds (216), and the second imbalance is determined during the maintenance. (217) is performed. After the _second dehydration, the rotation is maintained at ω 2 for t ₂ seconds (216), so that the rotation control is different from that of the first dehydration.

ω ₂ is a rotation speed for correcting the imbalance by spreading only the unbalanced portion on the inner peripheral surface of the drum 21 while maintaining the portion where the blanket is uniformly attached to the drum 21. FIG. 5 shows the rotation control after the second dehydration when the imbalance becomes larger than the first threshold value in the first unbalance determination (209) in the first dehydration. In the second dehydration, the rotation speed of the drum 21 is _{increased to ω 2} (215), and the second imbalance determination (217) is performed while maintaining _{ω 2} for t _{2 seconds (216).} When the imbalance falls below the second threshold value, the rotation of the drum 21 is stopped (214) and the third dehydration is performed. When the imbalance falls below the second threshold value while maintaining t _{2 seconds of ω 2 in} the third dehydration (216), the rotation speed of the drum 21 is constantly accelerated as shown by the dotted line in the third dehydration in FIG. At (for example, 3r / min / s), the temperature is _{increased to ω 1} (218). As shown by the solid line of the third dehydration in FIG. 5, when the imbalance falls below the threshold value of the second unbalance determination (217) _{while the ω 2} is maintained for t _{2 seconds (216).} While _{maintaining t 2} seconds, the rotation speed of the drum 21 may be constantly accelerated (for example, 3 r / min / s) to _{rise to ω 1} (218).

When the rotation speed of the drum 21 _{reaches ω 1} after the second dehydration, ω ₁ is maintained for t ₁ second (208) as in the first dehydration, and the first imbalance determination (209) is performed during the maintenance. .. When the imbalance is smaller than the first threshold value, the rotation speed of the drum 21 is increased (210) to perform dehydration, and when the imbalance is larger than the first threshold value, the rotation of the drum 21 is stopped (214). And repeat the retry. An upper limit is set for the number of retries of the first unbalance judgment (209) and the second unbalance judgment (217), and when the number of retries reaches the upper limit, the blanket imbalance due to water injection is corrected. You may.

When the _{imbalance determined by ω 1} is smaller than the threshold value of the first unbalance determination (209), the rotation speed of the drum 21 is increased (210), the resonance of the outer tank 11 is passed, and the target rotation is achieved. It shifts to the high-speed rotation speed range toward the number.

In the high-speed rotation speed range, since the resonance of the outer tank 11 is passed, the vibration sensor 18 provided in the outer tank 11 makes a third unbalance determination (211). If the unbalance is smaller than the third threshold value of the vibration sensor 18, it is determined whether the rotation speed of the drum 21 has reached the target rotation speed (212), and if it has reached the target rotation speed. Time operation (219) is performed, and dehydration is completed (213). If the rotation speed of the drum 21 has not reached the target rotation speed, the rotation speed increase (210) of the drum 21 and the third unbalance determination (211) are repeated until the target rotation speed is reached.

When the imbalance in the high-speed rotation speed range becomes larger than the threshold value of the vibration sensor 18, the rotation speed of the drum 21 is temporarily stopped (214), and dehydration is performed again by the rotation control after the second dehydration. An upper limit is set for the number of retries in the third unbalance judgment (211), and when the upper limit of retries is reached in the third unbalance judgment (211), the blanket imbalance due to water injection is corrected. You may.

As described above, by detecting the sticking state of the blanket in the first dehydration of the washing step, the rinsing step, or the final dehydration step (207) in the low speed range of the dehydration operation, the second dehydration when a retry occurs. After that, since the blanket can be attached to the drum 21 while correcting the blanket imbalance, the increase in the imbalance correction time can be suppressed, and the dehydration operation time and the power consumption can be increased. It can be suppressed. By detecting (207) the sticking state of the first dehydration shown in the example of the present embodiment _{and setting ω 2} after the second dehydration, the rotation of sticking while correcting the imbalance in the second and subsequent dehydrations. By performing the control in the final dehydration process, it is possible to prevent the operation from ending before the dehydration is completed. More preferably, the imbalance correction time can be suppressed in each dehydration step by detecting the sticking state of the clothes (207) in the first dehydration in each dehydration step of the washing step, the rinsing step or the final dehydration step. Therefore, it is possible to suppress an increase in operating time, and it is possible to suppress an increase in operating time and power consumption. Further, from the first dehydration sticking state (207) shown in the present embodiment, the _{rotation control of setting ω 2} after the second dehydration and sticking while correcting the imbalance is applied to the drum type washer / dryer. Can also be applied.

(Example 2)
Next, the second embodiment will be described in detail with reference to FIG.

Since the drum type washing machine 100 has basically the same configuration as that of the first embodiment, different parts will be described below.

FIG. 6 shows a flowchart of the dehydration step in the second embodiment. The dehydration operation of the drum 21 after the first imbalance determination (209) until the rotation of the drum 21 rises (210) is the same as that of the first embodiment, and the same reference numerals are given and the description thereof will be omitted.

In the second embodiment, when the imbalance in the high-speed rotation speed range becomes larger than the threshold value of the vibration sensor 18 in the third unbalance determination (211), the rotation speed of the drum 21 is temporarily stopped (300). Clear (301) the setting of _{ω 2} set from the first sticking state of dehydration. After that, the loosening operation (302) is performed, the rotation of the drum 21 is temporarily stopped (303), and the drum 21 is _{raised to ω 0} at a constant acceleration (for example, 3 r / min / s) (204) as in the first dehydration. ), When ω ₀ is reached, the detection of the sticking state of the blanket is started (205), and the sticking state of the blanket is detected between _{ω 0} and ω ₁ while increasing to _{ω 1 (206).} When ω ₁ is reached, the detection of the sticking state is completed (207), and the unbalance correction rotation speed ω ₂ is set from the detected sticking state.

When a retry occurs in the high-speed rotation speed range, the water contained in the blanket is compared to the case where the retry occurs in the first unbalance judgment (209) or the second unbalance judgment (217) in the low-speed rotation speed range. Many exit. Therefore, if the imbalance becomes larger than the third threshold in the third imbalance determination, the imbalance after retry is corrected according to the degree of drainage of the blanket by setting _{ω 2 again.} Since the number of revolutions can be set, it is possible to suppress an increase in the imbalance correction time, and it is possible to suppress an increase in the dehydration operation time and an increase in power consumption. In addition, as in Example 1, the imbalance is corrected in the _second and subsequent dehydrations by detecting the sticking state of the first dehydration in the final dehydration step (207) and setting ω 2 after the second dehydration. By sticking while, it is possible to prevent the operation from ending without completing the dehydration. More preferably, the imbalance correction time can be suppressed in each dehydration step by detecting the sticking state of the clothes (207) in the first dehydration in each dehydration step of the washing step, the rinsing step or the final dehydration step. Therefore, it is possible to suppress an increase in operating time, and it is possible to suppress an increase in operating time and power consumption. Further, when the imbalance becomes larger than the threshold value in the third unbalance determination (211) of this embodiment, the _{rotation control for setting ω 2} again can be applied to the drum type washer / dryer.

1 ... Housing 11 ... Outer tub 18 ... Vibration sensor 21 ... Drum 22 ... Motor 100 ... Drum type washing machine 205 ... Start of detection of sticking state 207 ... Sticking State detection end 209 ... 1st imbalance determination 217 ... 2nd unbalance determination

Claims (2)

A rotatable drum whose rotation axis is horizontal or inclined so that the back side is downward, an outer tub containing the drum and storing washing water, a housing containing the outer tub, and laundry in the drum. In a washing machine equipped with a means for determining a sticking state and a means for determining an imbalance.
In the first dehydration operation, the number of rotations of the drum in which the clothes are stuck is determined by the means for determining the sticking state of the clothes and the unbalance is determined by the means for determining the sticking state of the clothes. Is determined by the unbalance determination means while maintaining It is set from the second determination of the sticking state of the laundry, and after the second dehydration operation, the unbalance determination means is used while maintaining the rotation speed lower than the rotation speed of the drum in the sticking state for a predetermined time. A washing machine characterized in that a determination is made and rotation control different from that of the first dehydration operation is performed. In the washing machine of claim 1,
A washing machine characterized in that when the imbalance in the first dehydration operation is smaller than the threshold value of the imbalance determining means, the rotation speed of the drum is increased.

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