JP5169965B2 - Drum washing machine - Google Patents

Description

  The present invention relates to a drum-type washing machine for washing clothes in a rotating drum.

  Conventionally, this type of drum-type washing machine is configured as shown in FIG. Hereinafter, the configuration will be described.

  As shown in FIG. 5, the rotary drum 1 is provided with a large number of water passage holes 2 on the entire outer periphery thereof, and is rotatably disposed in the water tank 3. One end of the rotary shaft 4 is fixed in a substantially horizontal direction at the rotation center of the rotary drum 1, and a driven pulley 5 is fixed on the other end of the rotary shaft 4. The motor 6 is connected to the driven pulley 5 by a belt 7 and rotationally drives the rotary drum 1. The water tank 3 is suspended from the housing 8 so as to be swingable by a spring body 9, and vibrations at the time of dehydration start are reduced by the vibration isolating damper 10, and vibrations at the time of steady dehydration are not transmitted to the housing 8. A weight 11 for supporting and reducing vibration during dehydration is provided. The substantially cylindrical packing member 12 connects the opening 13 of the water tank 3 corresponding to the front opening of the rotating drum 1 and the housing front opening 14. A lid 15 is provided at the front opening of the housing 8 so as to be freely opened and closed. A heater 16 is provided on the bottom side of the water tank 3 to heat the washing water in the water tank 3. The control device 17 controls operations of the motor 6, the heater 16, the drain pump 18, the water supply valve 19, and the like, and sequentially controls a series of processes such as washing, rinsing, and dehydration. One end of the drain hose 20 in the housing is connected to the water tank 3, and the other end of the drain hose 20 in the casing is connected to the drain pump 18 to drain the washing water in the water tank 3. A water supply hose 21 is connected to the water supply valve 19 to supply water into the water tank 3.

  The operation of the above configuration will be described. After the lid 15 is opened, the laundry is put into the rotary drum 1, the power switch (not shown) is turned on, and then the start switch (not shown) provided in the control device 17 is operated. When the operation is started, the water supply valve 19 operates to supply water, and when a predetermined water level is detected by a water level detection means (not shown), the water supply is stopped and the motor 6 is driven. In the washing process, since water is contained in the laundry, while the replenishing water is supplied, the rotary drum 1 is rotated by the motor 6 at about 45 rpm, and the laundry in the rotary drum 1 is lifted and dropped onto the water surface. At this time, the heater 16 is energized and heated while controlling the washing water in the water tub 3 at a substantially constant temperature. When the washing process is completed, the drainage pump 18 operates to drain the washing water in the water tank 3. In the rinsing process, the same operation as in the washing process is performed. The dehydration process sequence after the rinsing process will be described with reference to FIG. As shown in the process with the rotation speed of the rotary drum 1 on the vertical axis and time on the horizontal axis, the rotation speed of the rotary drum 1 is increased to about 150 rpm, the preliminary dehydration step a is passed, and the forward and reverse rotation is performed at about 50 rpm. Step b is performed. Next, the rotating drum 1 is rotated to increase the rotation speed to about 100 rpm in the dehydration vibration prediction step c. When the measurement result is below a predetermined constant value due to the vibration of the water tank 3 by the unbalance identification device 22, the rotation continues. The number is increased to about 1000 rpm and the process proceeds to the centrifugal decentration step d for dehydration. In the dehydration vibration prediction step c, the unbalance identification device 22 receives the vibration of the water tub 3 and shows a predetermined constant value or more. When the imbalance due to the uneven distribution in the rotating drum 1 is detected, the rotation at about 100 rpm is stopped, and then the rotation is reversed at about 50 rpm, and the unbalance correction reversing step e is passed and the laundry of the rotating drum 1 is passed. The unbalance is reduced by changing the state of the drum and rotating the rotating drum 1 again to increase the rotation to about 100 rpm in the dehydration vibration prediction step c. 2 subjected to vibration of water tank 3 by, if going out of the predetermined constant value following measurement results, continues to migrate rotational speed about increasing the centrifugal de-heart step d to 1000 rpm.

Japanese Patent No. 2961565

  Such a conventional drum-type washing machine has a large volume of space occupied by laundry in the rotating drum in the dehydration process, particularly when the amount of laundry contained in the rotating drum is large. It becomes difficult to move the laundry. For this reason, control which performs pre-dehydration was performed on the assumption that it would be difficult to achieve a balance when rotating the rotating drum. When the preliminary dehydration is performed, the volume of the laundry itself is reduced by discharging the washing water from the laundry, so that the space volume without the laundry in the rotating drum is increased. Thereby, since the laundry can be moved within the rotating drum, it becomes easy to balance when rotating the rotating drum.

  Further, since the washing water is discharged from the laundry, the weight of the laundry is reduced, so that the inertial force applied to the rotating drum by the laundry during the dehydration activation is reduced, and the dehydration activation is facilitated.

  However, in the case of a small amount of laundry or the like, the space volume occupied by the laundry in the rotating drum is originally small, so the effect of the preliminary dehydration is small, and depending on the capacity, the time becomes unnecessarily long. That is, if the control for performing the preliminary dehydration is always performed, the washing time is extended and the power consumption is increased. In addition, even if there is a large amount of laundry in the rotating drum, depending on the type and materials of the laundry, some waste water can be released sufficiently by the drainage, so preliminary dehydration There is a case where it can be rotated in a well-balanced manner without carrying out the operation. In this case, the control that always performs the preliminary dehydration leads to an increase in washing time and an increase in power consumption.

  The present invention solves the above-described conventional problems, and does not necessarily perform preliminary dehydration in the dehydration step, but uses vibration detection means attached to the water tank to detect the vibration amplitude of the water tank at a certain rotation speed range. If the rotating drum is controlled and the rotating drum balance is good, dehydration is started without preliminary dehydration. If the rotating drum balance is poor, the rotating drum is adjusted so that the same effect as conventional preliminary dewatering can be obtained. It is something to control. Aiming to reduce the operating time and power consumption of drum-type washing machines amid the demand for energy saving products.

To achieve the above object, a drum type washing machine of the present invention, the first motor is controlled predetermined time number of rotation lower than the resonance point during the dehydration process, when the motor current fluctuation width is within a predetermined range Is a vibration detector that controls the motor for a predetermined time in a rotation speed band that increases the rotation speed and increases the rotation speed between the first resonance point and the second resonance point, and detects the vibration amplitude attached to the water tank. is obtained by a control so to increase the number of rotation upon detecting that there vibration amplitude in a predetermined range to the dewatering rotation number, by means.

As a result, the motor is controlled for a predetermined time at a rotational speed equal to or lower than the first resonance point, and the bias of the laundry in the rotary drum is confirmed by checking the motor current, and the first resonance point and the second resonance point are confirmed. by that controls the motor a predetermined time at a rotational speed range to increase the rotational speed between the points, by releasing the moisture in the breath laundry, used for realizing the less secure dehydration step vibration is there. Therefore, regardless of the capacity, type, and material of the laundry, the dehydration can be started without performing preliminary dehydration, so that the operation time can be shortened and the power consumption can be reduced.

The drum type washing machine of the present invention can realize an optimal dewatering process for each laundry without performing predetermined preliminary dewatering. Thereby, shortening between washing 濯時, reduction in power consumption, is capable of improving the high speed activation probability.

Side sectional view of the drum-type washing machine according to Embodiment 1 of the present invention. Side view of the drum type washing machine Dehydration process sequence diagram according to Embodiment 1 of the present invention Flow chart of dehydration process according to Embodiment 1 of the present invention Side view of a conventional drum-type washing machine Dehydration process sequence diagram of a conventional drum-type washing machine

A first aspect of the present invention is a rotary drum that is rotatably arranged in a water tub and whose rotation center axis is horizontal or inclined from the horizontal, a washing machine housing that slidably houses the water tub, and a bottom portion of the water tub A drain opening provided in the motor, a motor for rotationally driving the rotating drum, a rotation speed detecting means for detecting the rotation speed of the rotating drum, a water supply means for supplying washing water into the water tank, and a washing in the water tank running and drainage means for draining water, a vibration detecting means for detecting the vibration amplitude attached to the tub, the motor, the water supply means, and the washing by controlling drainage means such as rinsing, the steps of dehydration, such as and control means for, said motor at a first resonance point following rotation number controlled predetermined time during the dehydration step, if the motor current variation width is within a predetermined range, increases the rotational speed, the during the first resonance point and the second resonance point The motor is controlled predetermined time at a rotation speed band increases the rotational speed, and to control so as to increase the number of rotation upon detecting that there vibration amplitude in a predetermined range to the dewatering rotation number, by the vibration detection unit Is.

Thereby, when the vibration amplitude of the aquarium is small, for example, when the laundry is small, when the material is well drained, or when it is arranged in the rotating drum without any deviation, the number of rotations below the first resonance point In addition, it is possible to shorten the control time of the rotating drum in the rotation speed range in which the rotation speed is increased between the first resonance point and the second resonance point, and it is possible to increase the rotation speed to the dehydration rotation speed. Regardless of the capacity, type, and material of the laundry, since the dehydration can be started without performing the preliminary dehydration, the operation time can be shortened and the power consumption can be reduced. Here, since the number of rotations below the first resonance point is the number of rotations below the first resonance point, the arrangement in the rotating drum of the laundry impairs dehydration rotation without greatly vibrating the water tank. This is the number of rotations that can confirm the presence or absence of. The rotation speed band that increases the rotation speed between the first resonance point and the second resonance point is a rotation speed at which a large amount of washing water is discharged from the laundry and the laundry does not stick to the inner wall of the rotating drum. Therefore, the number of rotations is such that the laundry is easily peeled off when a large amount of washing water is discharged from the laundry and the motor is stopped.

The second invention, the control means, even if the first predetermined time controlling the motor at a rotational speed lower than the resonance point, if the motor current variation width does not fall within the predetermined width, stops the motor A post-unwinding operation is performed and the dehydration process is started again.

  As a result, if it is assumed that the motor current does not fall within the specified width, that is, the laundry unbalance in the rotating drum is large, the motor drive is stopped once, the loosening operation is performed, and the balance is adjusted. The process can be restarted from the beginning. By detecting the magnitude of the unbalance of the laundry at an early stage of the dehydration process, it is possible to prevent vibration and noise of the washing machine body caused by a large vibration of the water tank, thereby realizing safe and reliable dehydration.

A third invention, the control means, wherein when the vibration amplitude is controlled predetermined time the motor at a rotational speed range does not fall within the predetermined range, the dehydration step is carried out again the operation loosened after stopping the motor It ’s what I ’ve started.

Thus, when the vibration and control the motor a predetermined time is greater in the rotational speed range, but would again dehydration, because in that case that the washing water is discharged from the laundry, the laundry in the rotary drum Since there is a large space with no space and the laundry can be moved within the rotating drum, it is possible to easily improve the unbalance of the laundry due to the loosening operation. In addition, the inertial force applied to the rotating drum by the laundry during dehydration activation can be reduced, and the laundry is stuck to the rotating drum because the dehydration is repeated at a rotation speed at which the laundry does not stick to the rotating drum. It can be easily rotated and replaced. As a result, the unbalanced state of the laundry can be easily changed, and dehydration can be easily started. That is, the effect by the control of the rotating drum when the vibration amplitude of the water tank is large has the same effect as the preliminary dewatering.

A fourth invention, the control means is obtained by setting a plurality of said rotational speed range.

  Thereby, the reliability of vibration detection can be improved by detecting the vibration of the water tank a plurality of times. In addition, by increasing the rotational speed stepwise below the second resonance point, it becomes easier to discharge the washing water contained in the laundry to the outside of the machine, and the inertial force applied to the rotating drum by the laundry during dehydration activation Since it can be reduced, dehydration activation can be facilitated.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, the thing of the same structure as a prior art example attaches | subjects the same code | symbol, and abbreviate | omits description.

(Embodiment 1)
FIG. 1 is a side sectional view of a drum type washing machine according to a first embodiment of the present invention. In FIG. 1, the rotating drum 30 is formed in a bottomed cylindrical shape, and a large number of water passage holes 31 are provided on the entire surface of the outer periphery, and are rotatably disposed in a water tank 32. A rotation axis (rotation center axis) 33 is provided at the rotation center of the rotary drum 30 in the inclination direction, and the axial center direction of the rotation drum 30 is inclined downward from the front side toward the back side. A motor 34 attached to the rear surface of the water tank 32 is connected to the rotary shaft 33, and the rotary drum 30 is driven to rotate in the forward and reverse directions by the motor 34. Several protruding plates 35 are provided on the inner wall surface of the rotating drum 30.

  An opening 37 provided on the upward inclined surface of the main body 36 on the front side of the aquarium 32 is covered with a lid 38 so that it can be opened and closed. By opening the lid 38, the opening 37, the aquarium clothing entrance 39 and the rotary drum clothing entrance The laundry is put into the rotary drum 30 through 40 so that the laundry can be taken out from the rotary drum 30. Since the lid body 38 is provided on the upward inclined surface, the user can reduce the degree of bending the waist when putting in and out the laundry.

  The water tank 32 is suspended from the main body 36 by a spring body 41 and a damper 42 so as to be swingable. A concave drainage groove 43 that is long in the direction of the rotation shaft 33 is provided on the inner bottom of the water tank 32. A drainage port 44 is provided near the back side of the bottom of the drainage groove 43, one end of the drainage channel 45 is connected to the drainage port 445, and the other end of the drainage channel 45 is connected to a drainage valve (drainage means) 46. Thus, the washing water in the water tank 32 is drained. The water supply valve (water supply means) 47 is provided for supplying washing water into the water tank 32 through the detergent case 48 and the water supply path 48a, and the water level detection means 49 is provided for detecting the water level in the water tank 32. Yes.

  The control device 50 is configured as shown in FIG. 2 and has a control means 51 constituted by a microcomputer, and via a power switching means 52, a motor 34, a drain valve (DV) 46, and a water supply valve (FV). 47 and the like, and a series of steps of washing, rinsing and dewatering are sequentially controlled.

  The control means 51 inputs information from the input setting means 53 for setting the driving course and the like, and displays it on the display means 54 based on the information to notify the user. The storage means 55 stores data necessary for control by the control means 51. In addition, 56 is a commercial power source and 57 is a power switch.

  The operation of the above configuration will be described. When the lid 38 is opened and the laundry is put into the rotary drum 30 and a predetermined amount of detergent is put into the detergent case 48 and then the operation is started, the washing process is executed first. In the washing process, the water supply valve 47 is operated to supply the washing water, and the washing water passes through the detergent charging case 48 and the water supply path 48a and enters the water tank 32 together with the detergent. After supplying water to a predetermined water level, the rotary drum 30 is controlled to start up to a first predetermined rotation speed (for example, 45 r / min), and a washing operation that repeats normal rotation, pause, inversion, and pause operations for a predetermined time Run. In addition, the laundry accommodated in the rotating drum 30 is lifted in the rotating direction by the projection plate 35 provided on the inner peripheral wall of the rotating drum 30 by the rotation of the rotating drum 30 at this time, and is lifted to an appropriate height. Since the agitating operation of dropping from the position is repeated, the laundry has the effect of tapping and washing.

  After performing this washing operation for a predetermined time, the washing process is terminated and the first draining process is executed. In the first draining process, the drain valve 46 operates to drain the water. At this time, the washing water in the water tank 32 is drained outside the machine through the drain port 44, the drain path 45, and the drain valve 46. Thereafter, the process proceeds to the first dehydration step.

  In the first dehydration step, the washing water contained in the laundry is raised to a second predetermined rotation speed (for example, 800 r / min) by rotating the rotating drum 30 and rotated at the second predetermined rotation speed for a predetermined time. , Dehydrate the washing water contained in the laundry.

  After performing this 1st dehydration process for the predetermined time, the water supply valve 47 operate | moves, the washing water is poured into the water tank 32 via the detergent addition case 48 and the water supply path 48a, and a 1st rinse process is implemented. In the first rinsing step, the rotation speed of the rotary drum 30 is set to a third predetermined rotation speed (for example, 40 r / min), and the forward rotation, pause, inversion, and pause operations are repeated, so that the laundry becomes the rotary drum. A rinsing operation is performed for a predetermined time, in which the stirring operation is repeated for a predetermined time by being lifted in the rotational direction by the projection plate 35 provided on the inner peripheral wall 30 and dropping from the raised appropriate height position.

  Thereafter, the second draining process is executed in the same manner as the first draining process, and after the second dehydrating process is executed in the same manner as in the first dehydrating process, the second rinsing process is executed in the same manner as in the first rinsing process. Furthermore, a 3rd drainage process is performed similarly to a 1st drainage process and a 2nd drainage process, and a final dehydration process is performed. The final dehydration process will be described in detail with reference to FIGS.

  First, in the washing and rinsing process, the rotating drum 30 is reversed left and right at a fourth predetermined rotation speed (for example, 50 r / min) in step 100 with the intention of loosening the cloth entangled in the rotating drum 30. Then, it starts up to 85 r / min. The set rotational speed of 85 r / min in step 101 is the rotational speed at which the laundry sticks to the rotating drum due to centrifugal force, and the control means 51 detects the current fluctuation width of the motor 34, thereby The unbalanced state of laundry is detected. When the current fluctuation range is equal to or less than a certain value, the rotational speed is increased from 85 r / min to 300 r / min. Since the number of rotations during this period is the first resonance point of the water tank, the number of rotations of the rotating drum 30 is rapidly increased at a speed of 20 rotations per second, and control is performed so that the vibration of the water tank 32 does not increase due to the resonance point. ing.

  The section A in step 102 shown in FIGS. 3 and 4 will be described. The rotational speed is increased from 300 r / min to 320 r / min at a speed of 2 revolutions per second. This rotational speed range is a rotational speed range in which a large amount of washing water contained in the laundry is discharged. If the rotational speed of the rotating drum 30 is rapidly increased in this rotational speed range, the washing water discharged from the laundry cannot catch up with the outside of the machine, and the washing water accumulates in the aquarium 32. This hinders the rotation of the rotary drum 30 and places a high load on the motor 34. When a high load is applied to the motor 34, the life of the motor 34 is shortened, and it becomes difficult to ensure the reliability of the motor 34. Therefore, in such a rotation speed range, the increase in the rotation speed is moderated in consideration of the time required for drainage. In the dehydration start-up of the drum type washing machine, the rotation speed is maintained in a substantially steady state in such a rotation speed band, and it is often waited for the drainage of washing water to the outside of the machine. In the present embodiment, the vibration amplitude of the water tank 32 is detected by the vibration detecting means 58 attached to the upper front surface of the water tank 32 shown in FIG. 1 using the section A waiting for the drainage to catch up. It is characterized by. That is, in consideration of the first overshoot in the section A in which the rotational speed is increased at a speed of 2 revolutions per second from 300 r / min to 320 r / min, the vibration detection means 58 is activated from 310 r / min to 320 r / min. To detect vibration amplitude. Further, since the increase in the rotational speed is gradual, the vibration amplitude can be detected stably. When it is determined that the value output from the vibration detection means 58 is smaller than the vibration amplitude threshold value a determined in the section A, the rotation speed of the rotary drum 30 is continuously increased. If it is determined that the value output from the vibration detection means 58 is greater than the vibration amplitude threshold value a, the rotary drum 30 is stopped and the process returns to step 100. At this time, at a rotational speed of about 300 r / min, even if the rotary drum 30 is stopped, the laundry does not stick to the rotary drum 30. Easy to change balance. If the laundry is stuck to the rotating drum when the rotating drum is stopped, in order to change the unbalanced state, the rotating drum 30 is repeatedly stopped, rotated forward, stopped, and reversed. Laundry must be peeled off the wall, leading to longer washing time and increased power consumption. In this embodiment, such a problem is solved. In addition, since the washing water is discharged from the laundry even after the dehydration is performed again, the inertial force applied to the rotary drum by the laundry during the dehydration start can be reduced, and the space without the laundry in the rotary drum Since the volume is large and the laundry can be moved in the rotating drum, it is easy to improve the unbalance of the laundry due to the loosening operation, and it is easy to balance the rotating drum.

  When the value output from the vibration detection means 58 is smaller than the vibration amplitude threshold value a determined in the section A, the rotational speed is increased from 320 r / min to 400 r / min (for example, 20 rotations / s).

  Next, the section B in step 103 will be described. From 400 r / min to 420 r / min, the rotational speed of the rotating drum 30 is increased at a speed of two revolutions per second. This rotational speed range is also the rotational speed at which much washing water contained in the laundry is discharged. At this time, even if the rotating drum is stopped, the laundry does not stick to the rotating drum.

  In this section (from 410 r / min to 420 r / min), the vibration detection means 58 is used again to detect the vibration amplitude of the water tank 32. Since the rotational speed increase of the rotary drum 30 is moderate, the vibration amplitude can be detected stably. When it is determined that the value output from the vibration detection means 58 is smaller than the vibration amplitude threshold value b determined in the section B, the rotational speed of the rotary drum 30 is increased as it is. When it is determined that the vibration amplitude is large, the rotating drum is stopped. As in the case of 310 r / min to 320 r / min, even if the rotating drum 30 is stopped, the laundry does not stick to the rotating drum 30. Easy to change the unbalanced state.

  These controls that operate when the value output from the vibration detection means 58 is greater than each vibration amplitude threshold value determined in each section and the operation of the rotary drum 30 have the same effects as the conventional preliminary dewatering, that is, unbalance. Reduction, dehydration vibration, and high-speed dehydration start probability can be realized.

  Moreover, detecting the vibration amplitude of the water tank 32 at each rotation speed is equivalent to detection of imbalance, and plays a role of a filter that starts a high-speed rotation (for example, 1600 r / min) of a small vibration amplitude of the water tank 32. Plays. Whether or not high-speed rotation can be started can be determined on the low-speed side (here, 420 r / min or less), which leads to a reduction in washing time. That is, the imbalance of the water tank 32 is detected on the low speed side, and if there is no expectation of starting at high speed rotation, it is detected early and the dehydration is performed again.

  For example, unlike this embodiment, when the vibration amplitude of the water tank 32 is detected on the high rotation speed side (for example, the rotation speed above 600 r / min) to determine whether or not high-speed rotation activation is possible, Even if it takes an operation time to raise the speed to 600 r / min, and the rotation of the rotating drum 30 is stopped and the dehydration is performed again, the laundry is strongly stuck to the rotating drum 30, so it is easily unbalanced. Can not be resolved. In order to peel the laundry once stuck from the rotating drum 30, time and power are consumed. In the present embodiment, these are eliminated.

  In addition, there is another advantage of detecting the vibration amplitude of the water tank 32 at a plurality of rotation speeds. Normally, the vibration amplitude of the water tank 32 tends to decrease as the rotation speed increases, but not all of them are true. Therefore, [threshold a of section A]> [threshold b of section B] is set. This is to start dehydration of the water tank 32 whose vibration amplitude tends to decrease as the rotation speed increases. As a result, the accuracy of the detection for starting the high-speed rotation is increased, so that the high-speed rotation dehydration start probability can be improved.

  If it is determined in step 103 that the value output from the vibration detection means 58 is smaller than the vibration amplitude threshold value b determined in the section B, the process proceeds to step 104. When shifting to step 104, the rotational speed of the rotary drum 30 is increased to 700 r / min. Since there is a second resonance point in the meantime, the rotational speed is rapidly increased at a speed of 20 rotations per second to reach the resonance point. Control is performed so that the vibration of the water tank 32 does not increase. In step 104, the rotational speed of the rotary drum 30 is rotated at a steady speed of 700 r / min, and the control means 51 detects the value output from the vibration detection means 58. When the value is larger than the threshold value c, the number of rotations of the rotating drum 30 is not further increased. This is because even if the rotating drum 30 is stopped and the balance is re-established, the laundry is often stuck to the rotating drum when reaching 700 r / min. Because.

  If the value output from the vibration detecting means 58 is smaller than the threshold value c, the rotational speed of the rotary drum 30 is further increased, and the value output from the vibration detecting means 58 is detected again to determine the maximum rotational speed. Migrate to After step 105, in step 106, the rotational speed of the rotary drum 30 is increased to the maximum rotational speed determined in step 105. In step 107, the maximum rotational speed is maintained for a predetermined time, and the dehydration process is completed.

In this embodiment, the you are controlling the dewatering rotation speed of the rotary drum 30 by using the vibration detecting means 58, but the final dehydration step was only a first dewatering step, performed in a second dehydration step Also good.

  As described above, the drum-type washing machine according to the present invention rotates using the vibration detection means in the dehydration process in a rotation speed range where the laundry does not stick to the rotating drum and a large amount of washing water is discharged from the laundry. By controlling the drum, it is possible to provide a drum-type washing machine with a short washing time and low power consumption.

30 Rotating drum 32 Water tank 58 Vibration detecting means

Claims (4)

A rotating drum that is rotatably arranged in the aquarium and whose rotation center axis is horizontal or inclined from the horizontal, a washing machine housing that slidably accommodates the aquarium, and a drain outlet provided at the bottom of the aquarium A motor for rotating the rotating drum, a rotation speed detecting means for detecting the rotation speed of the rotating drum, a water supply means for supplying washing water into the water tank, and a draining means for draining the washing water in the water tank. comprising the, a vibration detecting means for detecting the vibration amplitude attached to the tub, the motor, the water supply means, and the washing by controlling drainage means such as, rinsed, and control means for executing the steps of dehydration, such as , said motor at a first resonance point following rotation number controlled predetermined time during the dehydration step, if the motor current variation width is within a predetermined range, it increases the rotational speed, a first resonance point first increasing the rotational speed between the second resonance point The motor is controlled predetermined time at a rotation speed band that, the drum type washing machine controls to increase the number of rotation upon detecting that there vibration amplitude in a predetermined range to the dewatering rotation number, by the vibration detection means. Said control means, said even first the motor at a rotational speed below the resonance point of the controlled predetermined time, when the motor current variation width does not fall within the predetermined width, dehydrated performs disentangling operation after stopping the motor The drum type washing machine according to claim 1, wherein the process is started again. Wherein, when said vibration amplitude by controlling a predetermined time the motor at a rotational speed range does not fall within the predetermined range, according to claim 1 starts dehydration step performs the operation loosened after stopping the motor again or 2. The drum type washing machine according to 2. The drum type washing machine according to any one of claims 1 to 3, wherein the control means sets a plurality of rotation speed ranges .