JP4901431B2 - Drum washing machine - Google Patents

Description

  The present invention relates to a drum-type washing machine, and more particularly to a technique for suppressing vibrations when centrifugal dehydration is performed by rotating a drum at a high speed. In the present specification, “dehydration” includes both dehydration in washing using ordinary water and dewatering in washing using a solvent such as a petroleum solvent or a silicone solvent.

  The drum type washing machine has a drum that is rotatable about a horizontal axis or an inclined axis, and the laundry contained in the drum is dehydrated by rotating the drum at a high speed. One of the major problems with such a drum-type washing machine is that when the drum is rotated at a high speed in a state where the laundry is disposed in the circumferential direction on the inner peripheral surface of the drum during centrifugal dehydration, The drum may vibrate greatly due to imbalance in mass distribution, which may cause abnormal vibration or abnormal noise in the outer tub or the casing itself. Further, such abnormal vibration of the drum is likely to cause a failure because a large load is applied to the shaft body that supports the drum and the bearing that supports the drum.

  In order to suppress the vibration during centrifugal dehydration as described above, various balance adjustment methods have been conventionally proposed. For example, in the drum-type washing machine described in Patent Document 1, while rotating the drum at a rotational speed such that the centrifugal force acting on the laundry in the drum is greater than the gravity, the circumferential direction on the drum inner circumferential surface is increased. By detecting the position of the eccentric load caused by the side of the laundry and temporarily reducing the rotational speed at the timing corresponding to the eccentric load position, the collected laundry is dropped to reduce the amount of eccentricity. The balance adjustment is performed. Such a method is effective when the laundry offset is concentrated in a relatively narrow range, but there are cases where appropriate balance adjustment cannot be performed when the laundry offset is in a relatively wide range. . In addition, the balance adjustment tends to take a relatively long time.

  On the other hand, in the drum type washing machine described in Patent Document 1, the balance adjustment operation is performed by fluctuations in the rotational speed of the drum in a state where a predetermined amount of water used for easy washing is left in the drum bottom. As described above, when the water is appropriately left in the drum, the laundry absorbs water when it passes through the bottom of the drum, and always has a sufficient water content. For this reason, even laundry that expands and occupies the space in the drum, such as futons and blankets, can be appropriately dispersed while keeping its volume small. There is an advantage that you can.

  For this reason, in drum-type washing machines that are currently commercialized (see Non-Patent Document 1), loosening the laundry is performed by reversing the drum at a low speed left and right while leaving a small amount of water in the outer tub. After that, the drum rotational speed is gradually increased according to a substantially linear speed change to a rotational speed at which all the laundry in the drum sticks to the inner peripheral surface of the drum, and the laundry is appropriately dispersed in the course of the drum. It is made to stick to the inner peripheral surface. By such a method, the laundry can be appropriately dispersed in a relatively short time to suppress the eccentric amount of the entire drum and shift to the high speed dewatering rotation.

JP-A-9-290089 "Coin-operated fully automatic washer-dryer SWD-A170GC", [Searched on November 6, 2006], Sanyo Techno Create Co., Ltd., Internet <URL: http://www.sanyo-technocreate.jp/products/coinlaundry /01/swd-a170gc/index.html>

  However, according to the experiments by the inventors of the present application, when the inner diameter of the drum is relatively small, the balance adjustment can be satisfactorily performed by the method described above, but when the drum inner diameter is increased, the amount of eccentricity is decreased. It turns out that things can be difficult. Specifically, the drum-type washing machine described in Non-Patent Document 1 has a drum inner diameter of 650 mm, and if this is the case, good balance adjustment is possible, but an attempt is made to increase the drum inner diameter to, for example, about 800 mm. Then, it may be difficult to perform a good balance adjustment with a similar control method.

  The present invention has been made to solve these problems, and the object of the present invention is to perform a good balance adjustment at the start-up of centrifugal dehydration even when the inner diameter of the drum is large, so that a high-speed drum can be obtained. An object of the present invention is to provide a drum type washing machine capable of avoiding the occurrence of abnormal vibration and abnormal noise during rotation.

In order to solve the above-mentioned problems, a first invention is a drum that is rotatable about a horizontal axis or an inclined axis, an outer tub for storing water inside the drum, and the drum. A drum-type washing machine comprising: a rotation drive unit including a drive source for rotation drive, wherein the laundry is dehydrated by rotating the drum at a high speed by the rotation drive unit;
in a state in which a) the laundry in the drum bottom water was remaining in the outer vessel to the extent that water in the drum bottom is exposed to water, the laundry accommodated in the said drum Of these, the centrifugal force and gravity are balanced against the laundry located on the drum inner peripheral surface side or the centrifugal force is greater than gravity, and the centrifugal force is smaller than gravity on the laundry located on the rotating shaft side. Control means for controlling the rotational drive means to maintain the rotational speed for a predetermined time, and thereafter to increase the rotational speed to a second rotational speed such that the centrifugal force acting on all the laundry is greater than gravity;
b) detecting the amount of eccentricity due to the distribution of the laundry in the circumferential direction when the drum is rotating at the second rotation speed, and rotating the drum at a high speed based on the detection result; A determination means for determining availability;
It is characterized by having.

Further, the second invention made to solve the above-mentioned problems includes a drum that is rotatable about a horizontal axis or an inclined axis, an outer tub for storing water inside the drum, and the drum. A drum-type washing machine comprising: a rotation drive unit including a drive source for rotating the drum; and rotating the drum at a high speed by the rotation drive unit to dehydrate laundry stored in the drum. ,
a) detecting the amount of eccentricity due to the distribution of the laundry in the circumferential direction when the drum is rotating at the second rotational speed described later, and rotating the drum at a high speed based on the detection result; A determination means for determining availability;
b) in a state where the laundry in the drum bottom water was remaining in the outer vessel to the extent that water in the drum bottom is exposed to water, the centrifugal force acting on all the laundry gravity If the drum is rotated at a second rotation speed that is greater than the rotation speed, and the determination means determines that high-speed rotation of the drum is not permitted, the laundry contained in the drum The first rotational speed at which centrifugal force and gravity are balanced with respect to the laundry located on the peripheral surface side or the centrifugal force is greater than gravity and the centrifugal force is smaller than gravity with respect to the laundry located on the rotation axis side Control means for controlling the rotational drive means to decrease the rotational speed to maintain the speed for a predetermined time, and then to increase the rotational speed to the second rotational speed for re-determination by the judging means;
It is characterized by having.

  When the drum type washing machine according to the first and second inventions is a washing machine that performs washing using a solvent, the above-mentioned “water” is read as “solvent”, and “dehydration” is read as “drainage”. That's fine.

  In the drum type washing machine according to the first aspect of the invention, for example, when the dehydration operation is performed following the washing operation or the rinsing operation, most of the water stored in the outer tub for the rinsing operation is removed from the machine. Drain and temporarily stop draining with water remaining in the outer tub so that water can be seen through the bottom of the drum. Then, under the control of the control means, the centrifugal force and the gravity are balanced or the centrifugal force is greater than the gravity with respect to the laundry positioned on the drum inner peripheral surface side among the laundry accommodated in the drum, and the rotation. The rotational speed is gradually increased to the first rotational speed at which the centrifugal force is smaller than gravity with respect to the laundry located on the shaft side, and the rotational speed is maintained for a while. At this time, the centrifugal force acting on the laundry located on the inner peripheral surface side of the drum is about 1 G. For example, when the inner diameter of the drum is about 800 mm, the rotation speed is about 50 rpm.

  When the drum is rotated at the first rotation speed, the laundry positioned on the inner peripheral surface side of the drum sticks to the inner peripheral surface of the drum by centrifugal force and rotates integrally with the drum, but the laundry positioned on the inner side thereof Falls downward while trying to be lifted above the drum by gravity. That is, the laundry on the drum inner peripheral surface side is generally in a state of being balanced around the rotation axis, and the unbalanced laundry is moving along with the rotation. is there. In addition, water is stored in the inner bottom of the drum, so that even if water is discharged from the laundry, the laundry is immediately replenished with water, and the laundry almost always contains sufficient water. It gets heavy.

  Therefore, when the laundry falls, it is difficult for the laundry to be thrown forward of the rotation, and the laundry tends to fall down and fall. As a result, when the drum is rotated for a while at the first rotation speed and then increased to the second rotation speed, the other laundry is moved from the state where the laundry is dispersed and stuck to the inner peripheral surface of the drum in a balanced manner. Since it spreads and sticks to the inner peripheral side, the drum as a whole is balanced and the amount of eccentricity tends to be small. According to the experiment by the present inventor, it was confirmed that the balance adjustment was performed with high probability even when the inner diameter of the drum was particularly large. The reason for this is not clearly understood, but when the drum inner diameter is large, it takes a certain amount of time for the laundry to stick almost uniformly over the entire drum inner surface because of the large drum inner peripheral area. It is considered effective to maintain the drum rotation speed at the first rotation speed for a predetermined time.

  On the other hand, in the drum type washing machine according to the second aspect of the present invention, when the eccentric amount detected with the drum rotating at the second rotational speed is large, the control means causes water to remain in the outer tub. The first rotational speed is such that only the laundry positioned on the drum inner circumferential surface side sticks to the drum inner circumferential surface by centrifugal force and does not rotate at a rotational speed at which all the laundry falls to the drum inner bottom. Reduce the rotation speed to the rotation speed. Therefore, only a part of the laundry leaves the restraint of the centrifugal force, and when it is lifted upward as the drum rotates, it moves so as to drop, and by dispersing this laundry appropriately, the entire drum The amount of eccentricity can be reduced. For this reason, compared with the case where all the laundry is once dropped on the drum bottom and the balance adjustment is performed again, the next time the speed is increased to the second rotational speed, the balance can be achieved with higher probability. . In particular, even when the inner diameter of the drum is large, it is possible to perform a good balance adjustment with a high probability in the same manner as in the first invention.

  According to the drum-type washing machine according to the first and second inventions, even when the inner diameter of the drum is large, the balance adjustment around the rotation axis at the start-up of the dewatering operation is performed well, and dewatering is performed at a higher rotational speed. Can be carried out. Thereby, the dewatering efficiency is improved, the detergent components and moisture remaining in the laundry can be reduced, and the rinsing performance and the drying performance can be improved. In addition, it is possible to avoid a prolonged dehydration time by quickly performing dehydration startup.

  Further, in the drum type washing machine according to the first and second inventions, the control means discharges the water stored in the outer tub when the determination means permits the high-speed rotation of the drum, and the determination means In this state, it is preferable to detect the amount of eccentricity again and determine the rotation speed at the time of high-speed rotation of the drum based on the detection result.

  When the load of water with respect to drum rotation is large or when the way of draining water of each laundry is greatly different, there is a concern that the balance state of the entire drum changes after the water is discharged from the outer tub. On the other hand, in the preferable configuration, the amount of eccentricity is detected again after the water left in the outer tub is discharged, and based on the result, the smaller the amount of eccentricity, the higher the rotation speed at the time of high-speed drum rotation. Set to Therefore, even if the balance state of the entire drum changes after drainage, the rotational speed can be suppressed if the amount of eccentricity is large. Therefore, it is possible to reduce the load applied to the rotating shaft and bearings and to prevent breakdown and damage. it can. When such a load is small, high dewatering efficiency can be achieved by rotating the drum at a higher speed.

  A drum type washing machine as an embodiment of the first and second inventions will be described below with reference to FIGS. FIG. 1 is a schematic side cross-sectional view showing the overall configuration of the drum type washing machine of this embodiment.

  An outer tub 2 having a substantially cylindrical surface is disposed inside the box-shaped housing 1, and a drum 4 having a substantially cylindrical surface for accommodating the laundry extends in the front-rear direction inside the outer tub 2. The main shaft 5 is pivotally supported. The clothes input port formed on the front surface of the outer tub 2 is opened and closed by a door 3 so that the laundry can be taken in and out of the drum 4 with the door 3 opened. A large number of water passage holes 4a are formed in the peripheral surface of the drum 4, and the water supplied into the outer tub 2 at the time of washing and rinsing flows into the drum 4 through the water passage holes 4a, and at the time of centrifugal dehydration. The water discharged from the laundry in the drum 4 scatters to the outer tub 2 side through this water passage hole 4a. A baffle 4b is provided on the inner peripheral surface of the drum 4 to scrape the laundry at predetermined angular intervals in the circumferential direction.

  The main shaft 5 is rotatably supported by a bearing 6 mounted on the back wall of the outer tub 2, and a main pulley 7 is attached to the tip of the main shaft 5 protruding rearward. A motor 8 is installed at the bottom of the housing 1, and a motor pulley 9 is attached to the rotating shaft of the motor 8. The rotational power of the motor pulley 9 is transmitted to the main pulley 7 via the timing belt 10. As a result, when the motor 8 is driven, the drum 4 rotates around the main shaft 5 at a rotational speed at which the rotational speed of the motor 8 is reduced by a predetermined reduction ratio.

  A water supply pipe 12 provided with a water supply valve 13 is connected to the upper part of the back wall of the outer tub 2. When the water supply valve 13 is opened, water supplied from the outside is removed via the water supply pipe 12. It is supplied to the tank 2. On the other hand, a drain pipe provided with a drain valve 15 is connected to a drain port provided at the bottom of the outer tank 2, and when the drain valve 15 is opened, water in the outer tank 2 is drained. It is discharged out of the machine through the pipe 14.

  FIG. 2 is a block diagram showing an electric system configuration of the drum type washing machine. A control unit 20 including a CPU, a ROM, a RAM, a timer, and the like is placed at the center of control. An operation signal such as an operation start command is input from the operation unit 24 to the control unit 20, and the inside of the outer tub 2 is supplied from the water level sensor 26. The detection signal of the water level stored in is input. The control unit 20 executes predetermined processing in accordance with a control program stored in the internal ROM, controls the rotation speed, rotation direction, and the like of the motor 8 via the inverter drive unit 22 and supplies water via the load drive unit 21. The opening / closing operation of the valve 13 and the drain valve 15 is controlled. The rotational speed of the motor 8 (or drum 4) is detected by the speed detector 23 and fed back to the inverter drive unit 22 and the control unit 20. The current detection unit 27 detects a torque current component in the drive current (motor current) supplied from the inverter drive unit 22 to the motor 8 and feeds back the current value (amplitude value) to the control unit 20. In addition, the control unit 20 performs display corresponding to the operation and the operating state by the display unit 25.

  Generally, as will be described later, if the laundry is unevenly distributed on the inner peripheral surface of the drum 4 during centrifugal dehydration, the load torque fluctuates during one rotation of the drum 4, so the torque current component of the motor current is unevenly distributed in the laundry. It fluctuates according to the eccentric load caused by Since the fluctuation amplitude of the torque current component reflects the magnitude (eccentric amount) of the eccentric load, the control unit 20 can determine the eccentric amount based on the detection value from the current detecting unit 27.

  Next, control during the dehydration process as a characteristic operation in the drum type washing machine of this embodiment will be described with reference to FIGS. FIG. 3 is a graph showing temporal changes in the rotational speed of the drum 4 at the start of dehydration, FIG. 4 is a flowchart showing the control procedure at the start of dehydration, and FIG. 5 shows the distribution / movement state of the laundry in the drum. It is a schematic diagram. In the following description, the numerical value of the rotational speed is shown when the inner diameter of the drum 4 is 800 mm.

  When the normal automatic operation is performed, the dehydration process is performed after being easily washed, and when the washing is too easy, the drain valve 15 is closed, and water up to a predetermined water level is stored in the outer tub 2. When the washing operation and the rinsing operation are completed, the control unit 20 opens the drain valve 15 via the load driving unit 21 and discharges the water stored in the outer tub 2 to the outside through the drain pipe 14. And the control part 20 monitors the stored water level in the outer tank 2 with the water level detection signal from the water level sensor 26, and once closes the drain valve 15 so that a water level may be about 1 degree (step S1). This water level is expressed with the center of the outer tub 2 being 10 degrees and the bottom of the outer tub 2 being 0 degrees. The water level L of 1 degree is slightly present at the inner bottom of the drum 4 as shown in FIG. The water is in a state of peeping.

  Next, the control unit 20 drives the motor 8 via the inverter drive unit 22, and performs a loosening operation by alternately driving the drum 4 in the reverse direction at a rotational speed of 25 rpm (step S2). At this time, the laundry in the drum 4 is agitated as shown in FIG. 5 (a), whereby the entanglement of the laundry is loosened, and the laundry becomes easily separated. Next, the rotation direction of the drum 4 is fixed in one direction, the rotation speed is increased from 25 rpm to 50 rpm, and when the rotation speed becomes 50 rpm, the balance adjustment operation is performed by maintaining the rotation speed (step S3). ). FIG. 3 shows a change in the rotational speed after the time when the rotational speed of the drum 4 is increased from 25 rpm. Here, the speed is increased almost linearly to 50 rpm.

  The rotational speed of 50 rpm is such that the centrifugal force acting on the laundry existing along the inner peripheral surface of the drum 4 becomes about 1 G in the drum 4 having the above inner diameter, that is, the centrifugal force and the gravity are almost balanced. Which corresponds to the first rotational speed in the present invention. Therefore, as shown in FIG. 5B, the laundry present on the inner peripheral surface side of the drum 4 is lightly attached to the inner peripheral surface of the drum 4 by centrifugal force, and the laundry present in the inner side is more than the centrifugal force. It falls with the rotation of the drum 4 because the gravity is larger. At this time, since a small amount of water remains on the inner bottom portion of the drum 4, the laundry is sufficiently heavy and contains water. That is, a little water is discharged from the laundry with stirring, but when water is stored in the inner bottom of the outer tub 2, the dropped laundry almost always contains enough water to absorb water again. Maintain state. Therefore, when the laundry located inside the drum 4 falls as shown in FIG. 5 (b), it does not pop out vigorously in the front of the rotation, and falls while spreading to the near side.

  Then, when the balance adjustment operation is executed for a predetermined time (for example, about several seconds), the laundry is stuck on almost the entire inner peripheral surface of the drum 4 and the balance is obtained. Things will move. Then, the rotational speed of the drum 4 is increased from 50 rpm to 90 rpm, and when the rotational speed reaches 90 rpm, the rotational speed is maintained to perform a balance determination operation (step S4). The rotational speed of 90 rpm is such that the centrifugal force acting on the laundry existing along the inner peripheral surface of the drum 4 is about 3 G in the drum 4 having the above inner diameter, and acts on the laundry located on the inner side of the drum 4. The centrifugal force is 1G or more. Therefore, as shown in FIG. 5C, all the laundry is pressed against the inner peripheral surface of the drum 4 by centrifugal force, and rotates together with the rotation of the drum 4.

  As described above, when the rotation speed of the drum 4 is 50 rpm, the remaining laundry is moved inside the laundry stuck to the inner peripheral surface of the drum 4, and the rotation speed is increased to 90 rpm. The remaining laundry sticks to the inside of the laundry on the outer peripheral side while being dispersed moderately. This increases the probability that the entire drum 4 can be balanced.

  During the balance determination operation, the control unit 20 performs balance determination based on the detection value obtained from the current detection unit 27 (step S5). That is, as described above, the fluctuation amplitude of the torque current component of the motor current reflects the amount of eccentricity caused by the deviation of the laundry stuck on the inner peripheral surface of the drum 4, so An allowable value is set, and it can be determined whether or not the balance is OK based on whether or not the fluctuation amplitude falls within the allowable value (step S6). If the balance is OK, the control unit 20 opens the drain valve 15 via the load driving unit 21, and discharges the water remaining in the outer tub 2 to the outside of the machine (step S7).

  After discharging water, the controller 20 determines the amount of eccentricity based on the detection value obtained from the current detector 27 (step S8). That is, this time, as described above, it is determined which of the plurality of ranges the fluctuation amplitude of the torque current component of the motor current falls. Then, the maximum rotation speed during high-speed dewatering is determined according to the amount of eccentricity (step S9). Here, it is assumed that the maximum rotational speed is set in three stages of 600 rpm, 500 rpm, and 400 rpm in ascending order of eccentricity. Then, the rotational speed of the drum 4 is increased from 90 rpm to the maximum rotational speed determined as described above, and high-speed dewatering is executed (step S10).

  When the amount of eccentricity is determined in step S5, water is stored in the outer tub 2 and all the laundry sufficiently contains water as described above. However, in step S7, water is discharged from the outer tub 2. When the laundry is pulled out, the balance may be slightly changed when the laundry is well drained (for example, made of chemical fibers). Further, since the amount of water stored in the outer tub 2 is very small, it does not basically become a load for the rotation of the drum 4, but it may affect the eccentricity detection depending on the case. Therefore, by determining the dehydration rotation speed based on the amount of eccentricity after draining water from the outer tub 2 as described above, the drum 4 is forcibly rotated at a high speed even though the amount of eccentricity is relatively large. It can be avoided that an excessive load is applied to the main shaft 5 and the bearing 6. In addition, when the amount of eccentricity is small, dehydration is performed at a high rotation speed, and high dehydration efficiency can be achieved.

  On the other hand, if it is determined in step S6 that the amount of eccentricity exceeds the allowable value, the process returns to step S3. That is, as shown in FIG. 3, while the water is stored in the outer tub 2, the rotational speed of the drum 4 is temporarily lowered from 90 rpm to 50 rpm. As described above, at this rotational speed, the laundry present on the inner peripheral surface side of the drum 4 does not fall, and only the laundry located on the inner side of the drum 4 falls due to gravity. Conventionally, when the amount of eccentricity is determined and it is impossible to start up to high-speed dewatering rotation, the loosening operation is once started again, but in this embodiment, the inner peripheral surface of the drum 4 that is in a substantially balanced state An attempt is made to balance the entire drum 4 by moving only the remaining laundry while leaving the laundry on the side as it is. Therefore, when the drum 4 is rotated at 50 rpm for a predetermined time (several seconds to 10 seconds) and then gradually increased to 90 rpm, the entire drum 4 can be balanced with a high probability.

  As described above, in the drum type washing machine of this embodiment, the laundry is quickly dispersed so that the eccentric amount of the entire drum 4 becomes small at the start of centrifugal dehydration, and high-speed dehydration rotation is performed with the eccentric amount being small. Can be migrated.

  In addition, each numerical value in the said Example is an example, Comprising: It is not limited to this. Moreover, although the said Example described the drum type washing machine using water, it is clear that this invention is applicable to the dry cleaner which uses solvents, such as a petroleum-type solvent. In addition, it is obvious that other changes are included in the scope of the claims of the present application even if appropriate modifications, corrections, and additions are made within the scope of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic sectional drawing which shows the whole structure of the drum type washing machine which is one Example of this invention. The block diagram which shows the electric system structure of the drum type washing machine of a present Example. The schematic diagram which shows the time change of the rotational speed of the drum at the time of dehydration start-up in the drum type washing machine of a present Example. The flowchart which shows the control procedure at the time of dehydration start-up in the drum type washing machine of a present Example. The schematic diagram for demonstrating the distribution and movement condition of the laundry in a drum at the time of dehydration start-up in the drum type washing machine of a present Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Housing 2 ... Outer tub 3 ... Door 4 ... Drum 4a ... Water flow hole 4b ... Baffle 5 ... Main shaft 6 ... Bearing 7 ... Main pulley 8 ... Motor 9 ... Motor pulley 10 ... Timing belt 12 ... Water supply pipe 13 ... Water supply valve DESCRIPTION OF SYMBOLS 14 ... Drain pipe 15 ... Drain valve 20 ... Control part 21 ... Load drive part 22 ... Inverter drive part 23 ... Speed detector 24 ... Operation part 25 ... Display part 26 ... Water level sensor 27 ... Current detection part

Claims (3)

A drum that is rotatable around a horizontal axis or an inclined axis, an outer tub for storing water inside the drum and storing water therein, and a rotation driving means including a driving source for rotating the drum. In the drum type washing machine for dehydrating the laundry stored in the drum by rotating the drum at a high speed by the rotation driving means,
in a state in which a) the laundry in the drum bottom water was remaining in the outer vessel to the extent that water in the drum bottom is exposed to water, the laundry accommodated in the said drum Of these, the centrifugal force and gravity are balanced against the laundry located on the drum inner peripheral surface side or the centrifugal force is greater than gravity, and the centrifugal force is smaller than gravity on the laundry located on the rotating shaft side. Control means for controlling the rotational drive means to maintain the rotational speed for a predetermined time, and thereafter to increase the rotational speed to a second rotational speed such that the centrifugal force acting on all the laundry is greater than gravity;
b) detecting the amount of eccentricity due to the distribution of the laundry in the circumferential direction when the drum is rotating at the second rotation speed, and rotating the drum at a high speed based on the detection result; A determination means for determining availability;
A drum-type washing machine comprising: A drum that is rotatable around a horizontal axis or an inclined axis, an outer tub for storing water inside the drum and storing water therein, and a rotation driving means including a driving source for rotating the drum. In the drum type washing machine for dehydrating the laundry stored in the drum by rotating the drum at a high speed by the rotation driving means,
a) detecting the amount of eccentricity due to the distribution of the laundry in the circumferential direction when the drum is rotating at the second rotational speed described later, and rotating the drum at a high speed based on the detection result; A determination means for determining availability;
b) in a state where the laundry in the drum bottom water was remaining in the outer vessel to the extent that water in the drum bottom is exposed to water, the centrifugal force acting on all the laundry gravity If the drum is rotated at a second rotation speed that is greater than the rotation speed, and the determination means determines that high-speed rotation of the drum is not permitted, the laundry contained in the drum The first rotational speed at which centrifugal force and gravity are balanced with respect to the laundry located on the peripheral surface side or the centrifugal force is greater than gravity and the centrifugal force is smaller than gravity with respect to the laundry located on the rotation axis side Control means for controlling the rotational drive means to decrease the rotational speed to maintain the speed for a predetermined time, and then to increase the rotational speed to the second rotational speed for re-determination by the judging means;
A drum-type washing machine comprising:   When the high-speed rotation of the drum is permitted by the determination means, the control means discharges the water stored in the outer tub, and the determination means detects the eccentric amount again in that state, and based on the detection result The drum-type washing machine according to claim 1 or 2, wherein a rotation speed at the time of high-speed rotation of the drum is determined.

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