KR20040108547A - Drum type washing machine - Google Patents

Abstract

PURPOSE: A drum washing machine is provided to prevent abnormal noise of a drum, an outer tub and an outer housing or abnormal noise securely in dehydrating, and to dehydrate the laundry quickly considering eccentric load. CONSTITUTION: The moment of inertia and the eccentric load are measured in rotating a drum at 100 rpm, and the decision critical value is decided according to the moment of inertia and the eccentric load(S31-S42). The motor is controlled to accelerate within the range of 140 to 220 rpm less than the resonance point of about 250 rpm, and the value is measured according to fluctuation of acceleration(S43-S47). The large vibration is decided, and the emergency stop is performed in case of the value from the acceleration fluctuation to be over the critical value(S48). Acceleration is changed by adding uneven load to the bearing in rotating while reducing eccentric load, and the critical value is decided accurately according to the moment of inertia and the eccentric load.

Description

Drum-type washing machine {DRUM TYPE WASHING MACHINE}

The present invention relates to a drum type washing machine, and more particularly, to a technique for suppressing or reducing vibration generated mainly during centrifugal dehydration.

In a drum type washing machine, a drum having a circumferential surface having a large number of dehydration holes around it is rotated at a high speed about a horizontal or inclined axis, thereby squeezing water contained in the wet laundry after washing contained in the drum. Dehydration is performed by scattering. In this centrifugal dehydration, if the laundry is arranged in the circumferential direction from the inside of the circumferential surface of the drum, and there is an unbalance of mass (ie eccentric load) around the axis, the drum vibrates greatly when the drum rotation speed is increased. Accordingly, the outer cylinder containing the drum vibrates to contact the inside of the outer housing, or the outer housing itself vibrates to cause abnormal noise. Reducing the vibration and noise at the time of such centrifugal dehydration is a big problem in a drum type washing machine, and various measures have been taken and proposed conventionally.

Vibration suppression and reduction technologies in drum type washing machines are broadly divided into electrical and mechanical. The former suppresses an eccentric load (e.g., see Japanese Patent No. 3182382, etc.) that suppresses eccentric loads by appropriately dispersing the laundry in the drum by preventing rotation of the laundry, for example, by controlling the rotation of the drum. Eccentric load detection that accurately detects the magnitude of eccentric load due to dropping or the like and stops operation or re-disperses laundry when there is a high risk of abnormal vibration (e.g., Japanese Patent No. 3188143, Japanese Patent No. 3311668) Furthermore, active eccentric load reduction (see, for example, Japanese Patent No. 3229845, etc.), which actively reduces the eccentric load by adding a load to the drum to balance the eccentric load due to the washing of the laundry. Include. On the other hand, the latter is to suppress the vibration of the outer cylinder by the structure or mounting structure of the damper or spring for supporting the outer cylinder, or even when the outer cylinder vibrates significantly, to suppress the vibration of the outer housing.

Since it is practically impossible to completely suppress vibration in any case, the dehydration time that takes time for dehydration operation is abnormal while suppressing vibration as much as possible by combining the control method and the mechanical method as described above. It is also necessary to avoid lengthening.

Background Art Conventionally, eccentric loads due to deflection of laundry in a drum are often considered only in the circumferential direction of the drum, and little consideration has been given to the distribution of the laundry in the drum axial direction. In the case of a drum shape having a relatively small axial size or when the shaft is inclined, the conventional thinking as described above has not been a problem. By the way, when the drum has a shape having a relatively large size in the axial direction, furthermore, in the structure where the axis is horizontal, the influence of the distribution of the laundry in the axial direction on the vibration cannot be ignored.

For example, in the drum type washing machine described in Japanese Unexamined Patent Publication No. 2001-276468, in the drum structure of the cantilever support, the distance from the attachment position of the shaft (that is, the distribution of laundry in the axial direction) even when the same eccentric load exists. In consideration of this, the allowable value of the eccentric load is determined. In this case, a relatively simple case is assumed that the position of the bundle of laundry is in the axial direction.

However, if you consider a more complex case (which can actually happen at a higher frequency), even though the eccentric load is almost zero when viewed in the drum circumferential direction, the two bundles of laundry fall in the axial direction and the shaft Since it is arrange | positioned in between, it may generate a very big vibration. This situation is not conventionally assumed, and there is a possibility that abnormal vibrations or abnormal noises may occur.

In addition to vibrations caused by the special distribution of the laundry in the drum axial direction, vibration of the drum, the outer cylinder, and the outer housing may actually occur due to various distribution methods of the laundry. In some cases, it could not be detected accurately by the method, or a large vibration occurred before the detection was attempted.

In addition, the more time is required to detect a situation in which a large vibration may occur, the longer the time required for such a detection becomes, and there is a problem in that it takes time for dehydration operation to transition to the original high speed dewatering operation.

In addition, in the conventional general drum type washing machine in which the door for opening and closing the clothes inlet is formed on the front side of the outer housing, the water sealing packing formed on the inside of the door is in close contact with the outer cylinder when the door is closed. Together with dampers, it was able to maintain the posture of the outer cylinder. On the other hand, in the drum type washing machine (for example, refer to Unexamined-Japanese-Patent No. 2003-93777 etc.) of the structure which formed the upper lid which opens and closes a clothing input opening on the upper surface of the outer housing which the applicant has commercialized, the opening formed in the outer cylinder A lid for opening and closing is formed in the outer cylinder, and there is no water sealing packing connecting the outer housing and the outer cylinder. For this reason, this packing cannot assist in maintaining the posture of the outer cylinder. The posture of the outer cylinder in the outer housing can be reduced while suppressing the vibration of the outer cylinder or the outer housing as much as possible only by dampers or springs for absorbing vibration. There is a need for a structure that can be properly maintained.

The present invention has been made in order to solve various problems related to the vibration suppression as described above, the main object of which is to prevent the abnormal vibration of the drum, the outer cylinder, the outer housing, and the like during dehydration stroke and the abnormal noise thereof, It is to provide a drum type washing machine that can start dewatering quickly.

1 is an external perspective view of a drum type washing machine according to an embodiment of the present invention.

2 is a front longitudinal sectional view of an inner main portion of the drum type washing machine according to the present embodiment.

3 is a left side view of an inner main portion of the drum type washing machine according to the present embodiment.

4 is an electric system configuration diagram of main parts of the drum type washing machine according to the present embodiment.

5 is a front perspective view A, a top perspective view B, and a right side perspective view C, which schematically show a supporting structure of an outer cylinder of a drum type washing machine according to the present embodiment.

6 is a longitudinal sectional view of a damper in a mounted state in the drum type washing machine according to the present embodiment.

7 is a schematic explanatory diagram of vibration suppression using a balance chamber in the drum type washing machine according to the present embodiment.

8 is an explanatory diagram of an example of an eccentric state.

9 is a flowchart showing a control procedure during dehydration operation in the drum type washing machine according to the present embodiment.

Fig. 10 is a flowchart showing a control procedure during dehydration operation in the drum type washing machine according to the present embodiment.

11 is a flowchart showing a control procedure during dehydration operation in the drum type washing machine according to the present embodiment.

12 is a graph showing an example of a change state of the rotational speed of the drum during the eccentric check of the first stage.

Fig. 13 is a graph showing a schematic change of drum rotational speed during dehydration.

Explanation of symbols on the main parts of the drawings

1: outer housing 2: upper lid

3: laundry inlet 7: support

10: outer cylinder 12, 12a, 12b: damper

120: cylinder 121: rod

123: spring support plate 124, 127: flange

125, 128: screw groove 126: shaft

13: drum 14: spindle

15: auxiliary shaft 16, 18: bearing case

17, 19: bearing 20: drum motor

20a: Stator 20b: Rotor

20c: rotation sensor 24: balance chamber

30 control unit 31 load driving unit

32: inverter drive unit 50: upper mounting plate

51: lower mounting plate 52, 59: dish type washer

54, 61; Flat Washers 55, 62: Nuts

57: protective sheet 58: gap

53, 56, 60, 63: cushion

1st invention which was made | formed in order to solve the said subject is the drum type washing machine which spins the drum which accommodated laundry to a high speed about a horizontal or inclined axis | shaft, and performs dehydration of the said laundry,

a) The centrifugal force acting on the laundry in the drum is caused by the washing of the laundry in the drum circumferential direction while the drum is being rotated at a rotational speed at which the centrifugal force acting on the laundry in the drum is lower than the resonance rotational speed corresponding to the resonance point. Eccentric load detection means for detecting the magnitude of the eccentric load,

b) in the process of controlling to raise the rotational speed of the drum with a substantially constant acceleration within a range of the rotational speed higher than the first rotational speed and lower than the resonance rotational speed, based on the variation of the actual acceleration. Index value obtaining means for obtaining an index value reflecting the distribution of laundry in the axial direction;

c) set a different threshold value according to the magnitude of the eccentric load detected by the eccentric load detecting means, and when the indicator value exceeds the threshold value, the abnormal vibration may be caused by the deflection of the distribution of the laundry in the drum axial direction. And a judging means for judging that there is a high possibility of occurrence.

As described above, there are deflections in which the bundles of laundry are present in the drum at two positions distant from each other in the axial direction (typically adjacent to both ends of the drum respectively) and at opposite positions with the shaft interposed therebetween. In the case of the drum circumferential direction, the bundles of the two laundry objects face each other with their axes interposed therebetween, and if the weights are the same, the eccentric load becomes almost zero due to the balance between them. However, by being in a position apart from each other in the axial direction, when the drum rotates, a force is applied to rotate both ends of the shaft in opposite directions (in reverse phase), and accordingly, a large force is applied to the drum or the outer cylinder containing the drum. Vibration occurs. When the above force is applied, the bearing takes an uneven load due to the rotation, so even if the drum's rotational speed is increased by almost constant acceleration, the actual acceleration will vary, and the degree of the variation is basically described above. It depends on the degree of deflection of the laundry in the axial direction.

However, the variation in acceleration depends on the eccentric load in the drum circumferential direction. When the eccentric load is an allowable range but relatively large, the variation in acceleration is large. Therefore, in order to remove the influence of the magnitude of the eccentric load in the drum circumferential direction and to accurately grasp the possibility of the occurrence of abnormal vibration due to the deflection of the distribution of the laundry in the drum axial direction, in the drum type washing machine according to the first invention, First, the eccentric load detection means detects the eccentric load due to the deflection of the laundry in the drum circumferential direction while the drum is being rotated at the first rotational speed. At this time, the factor of the deflection of the laundry in the axial direction is not reflected.

Next, the index value obtaining means changes the actual acceleration in the process of controlling to raise the rotational speed of the drum with almost constant acceleration within the range of the rotational speed higher than the first rotational speed and lower than the resonance rotational speed. Based on this, the index value reflecting the distribution of laundry in the drum axial direction is obtained. Even when the index values obtained at this time are the same, the deflection of the laundry in the axial direction is small when the eccentric load is relatively large. On the contrary, the deflection of the laundry in the axial direction is large when the eccentric load is relatively small. In the latter case, since the vibration tends to be larger than in the former case, by lowering the threshold value, which is a criterion for determining the index value, it is judged that abnormal vibration is more likely to occur even for a smaller index value.

Thus, according to the drum type washing machine according to the first aspect of the invention, since there is a tendency for the bundles of laundry to be present at two positions spaced apart from each other in the drum axial direction and at positions opposite to each other, the eccentric load in the drum circumferential direction In the case of becoming smaller, it is possible to reliably detect the distribution of such laundry and prevent abnormal vibrations from occurring. In addition, since the influence of the magnitude of the eccentric load in the drum circumferential direction is eliminated in such detection, the vibration is not large, but there is no determination that the occurrence of abnormal vibration is high by mistake. It is effective for shortening the time required for dehydration operation by preventing unnecessary retry of operation.

According to a second aspect of the present invention, there is provided a drum type washing machine for dewatering a laundry by rotating a drum containing laundry thereon at a high speed about a horizontal or inclined axis.

a) an inertia moment amount detecting means for detecting the amount of inertia moment during drum rotation reflecting the weight of the laundry in the water-containing state contained in the drum;

b) a process in which the centrifugal force acting on the laundry in the drum is controlled to increase the drum's rotational speed with a substantially constant acceleration within a rotational speed in which the centrifugal force is greater than gravity and in a range lower than the resonance rotational speed corresponding to the resonance point. An index value acquiring means for obtaining an index value reflecting a distribution state of laundry in the drum axial direction based on a change in the actual acceleration;

c) A different threshold value is determined according to the inertia moment amount detected by the inertia moment amount detecting means, and abnormal vibration is caused by the inclination of the distribution of laundry in the drum axial direction when the index value exceeds the threshold value. It is characterized by including determination means for determining that the probability is high.

In the drum type washing machine according to the second invention, the index value reflecting the distribution of the laundry in the drum axial direction is basically calculated in the same manner as in the first invention. This index value, that is, the variation in acceleration, also depends on the amount of moment of inertia during drum rotation. In other words, even if the distribution of laundry in the drum axial direction is the same, the acceleration is less likely to occur as the amount of moment of inertia increases. Therefore, in order to remove the influence of the magnitude of the moment of inertia, and to accurately grasp the possibility of the occurrence of abnormal vibration due to the deflection of the distribution of the laundry in the drum axial direction, in the drum type washing machine according to the second invention, first, the moment of inertia The amount detecting means detects the moment of inertia during rotation of the drum reflecting the weight of the laundry in the water-containing state contained in the drum. Even if the distribution of the laundry in the drum axial direction is about the same, the larger the moment of inertia, the smaller the index value. Thus, by lowering the threshold, which is a criterion for determining the index value, there is a high possibility of abnormal vibration even for a smaller index value. Judging by it.

Thus, even in the drum type washing machine according to the second aspect of the invention, since there is a tendency for the bundles of laundry to be present at two positions separated from each other in the drum axial direction and at positions opposite to each other, the eccentric load in the drum circumferential direction In the case of becoming smaller, it is possible to reliably detect such a state and to prevent abnormal vibration from occurring. In addition, since the influence of the moment of inertia, i.e., the weight of the laundry containing water, is eliminated in such detection, the vibration is not so large, but there is no determination that the possibility of abnormal vibration is high by mistake. Therefore, it is effective to shorten the time required for dehydration operation by preventing unnecessary retry of dehydration operation.

Since the above-described influences of the moment of inertia and the influence of the eccentric load in the drum circumferential direction are independent, it is preferable to consider both of them to determine the threshold value, which is the criterion of the index value.

That is, the 3rd invention made | formed in order to solve the said subject is the drum type washing machine which spins the drum which accommodated laundry to a high speed about a horizontal or inclined axis | shaft, and performs dehydration of the said laundry,

a) an inertia moment amount detecting means for detecting an amount of inertia moment during rotation of the drum reflecting the weight of the laundry in the water-containing state contained in the drum;

b) the centrifugal force acting on the laundry in the drum is caused by the washing of the laundry in the drum circumferential direction while the drum is being rotated at a rotational speed at which the centrifugal force acting on the laundry is greater than gravity and at a first rotational speed lower than the resonance rotational speed corresponding to the resonance point. Eccentric load detection means for detecting the magnitude of the eccentric load,

c) in the process of controlling to raise the rotational speed of the drum with a substantially constant acceleration within a range of the rotational speed higher than the first rotational speed and lower than the resonance rotational speed, based on the variation of the actual acceleration. Index value obtaining means for obtaining an index value reflecting the distribution of laundry in the axial direction;

d) A threshold is set differently according to the magnitude of the moment of inertia detected by the moment of inertia detecting means and the amount of eccentric load detected by the eccentric load-weight detecting means, and when the index value exceeds the threshold, the drum It is characterized by including determination means for determining that the occurrence of abnormal vibration is high due to the inclination of the distribution of the laundry in the axial direction.

According to the drum type washing machine according to the third aspect of the invention, since there is a tendency for the bundles of laundry to be present at two positions spaced apart from each other in the drum axial direction and at positions opposite to each other, the eccentric load in the drum circumferential direction When it becomes small, this state can be detected more reliably and it can prevent that abnormal vibration arises beforehand.

On the other hand, specifically as the drum type washing machine according to the third invention, the inertia moment amount detecting means is configured to detect the inertia moment amount when decelerating from the state in which the drum is being rotated at the first rotational speed. Can be.

According to this configuration, since both the magnitude of the eccentric load and the moment of inertia are detected while the drum is being rotated near the first rotational speed, the time required for these detections can be shortened and dehydration can be started quickly. have.

In addition, the vibration of the drum and the outer cylinder containing the same increases as the drum's rotational speed increases and approaches the resonance rotational speed. Therefore, as an aspect of the drum type washing machines according to the first to third inventions, the indicator value obtaining means obtains a repetitive indicator value within a range of the rotational speed, and the determination means then determines the indicator value from the threshold value. In comparison, it is preferable to set it as a structure which determines that the occurrence of abnormal vibration is high by the deflection of the distribution of the laundry in the drum axial direction, when the case whose index value exceeds the threshold occurs one to several times.

According to this configuration, in the process of raising the rotational speed of the drum, when the vibration gradually increases due to the inclination of the distribution of the laundry in the drum axial direction, it is reliably lowering the rotational speed of the drum before the vibration increases abnormally. It becomes possible.

According to a fourth aspect of the present invention, there is provided a drum type washing machine for dewatering laundry by rotating a drum containing laundry thereon at a high speed about a horizontal or inclined axis. A drum type washing machine comprising motor driving means for controlling a rotational speed of the motor by controlling a duty ratio of a signal,

a) The duty cycle setting control is performed to sequentially change the duty ratio of the PWM drive signal until the centrifugal force acting on the laundry in the drum reaches a predetermined rotation speed exceeding gravity until the drum stops. The rotation control means for converting the target speed to the set speed control after reaching the predetermined rotation speed;

b) an eccentric load detection means for detecting an eccentric load due to the deflection of laundry, based on a change in the actual rotational speed of the drum after switching from duty ratio setting control to speed control.

The laundry containing a large amount of water after washing or rinsing is difficult to disperse, and when the drum's rotational speed is increased while the laundry is extremely agglomerated in the drum, a large vibration occurs even when the drum's rotational speed is relatively low. There is. Therefore, in order to detect such a situation, in the drum type washing machine according to the fourth aspect of the present invention, the rotation control means has a duty until the centrifugal force acting on the laundry in the drum reaches a predetermined rotational speed exceeding gravity. Non-setting control is carried out, and when the drum's rotational speed reaches the predetermined rotational speed, it switches to speed control. Since the torque of the motor is very large at the time of switching of the control, even if switching to the speed control, the target speed is not stabilized immediately, and the rotational speed of the drum is overshooted. At this time, if there is an extreme sway in the laundry in the drum and the eccentric load is large, the rotational speed changes from a rapid rise to a rapid drop due to the rotational load caused by the eccentric load. On the other hand, if the eccentric load is small, the rotation speed is difficult to decrease, and the state in which the rotation speed is relatively high continues. For this reason, the eccentric load detection means can detect the eccentric load due to the deflection of the laundry on the basis of the variation in the rotational speed of the drum after the control is switched.

Specifically, for example, the eccentric load detection means judges that the eccentric load is large when the actual drum rotation speed continues to fall below the target speed or a threshold speed different from the predetermined time, and the rotation control means then. Can be configured to control the motor to stop the rotation of the drum to a speed at or near the stop.

Thus, according to the drum type washing machine concerning 4th invention, generation | occurrence | production of the abnormal vibration resulting from extreme tilting of the laundry in a drum can be prevented at the beginning of the rise of the rotation speed of a drum.

5th invention which was made | formed in order to solve the said subject, The drum type washing machine which spins the drum which accommodated laundry to a high speed about a horizontal or inclined axis | shaft to perform dehydration of the said laundry,

a) determining whether or not the magnitude of the eccentric load can be allowed while the drum is being rotated at a first rotational speed at which the centrifugal force acting on the laundry becomes greater than gravity and at a lower rotational speed corresponding to the resonance point. First eccentric load determining means,

b) when the magnitude of the eccentric load can be permitted by the first eccentric load determining means, the drum is rotated at a second rotational speed at which the drum rotates at a second rotational speed that is higher than the resonance rotational speed and withdraws water from the laundry. Second eccentric load determination means for determining whether the magnitude of the eccentric load in the state can be allowed;

c) When the dehydration operation is started for the first time after the start of the dehydration stroke, if it is determined by the second eccentric load determination means that the magnitude of the eccentric load cannot be tolerated, the rotation speed of the drum is lowered to loosen the laundry. If it is judged that the magnitude of the eccentric load can be tolerated, the control operation is shifted to the high-speed dehydration operation, and the second and subsequent dehydration operations are performed again by retrying the dehydration operation. In carrying out the operation, it is characterized by including operation control means for performing control to shift to the high speed dewatering operation by omitting the determination operation by the second eccentric load determination means.

In the drum type washing machine according to the fifth aspect of the invention, when the dewatering operation is performed for the first time after the start of the dehydration operation, the eccentric load is first determined at the first rotational speed lower than the resonance rotational speed, and when it can be allowed. The rotational speed of the drum is raised to the second rotational speed by passing through the resonance rotational speed. In this process, since the eccentric load is small, no large vibration occurs. At a second rotational speed, some water is drained from the laundry, but the balance of the load in the drum may be broken, thereby increasing the eccentric load. Therefore, the second eccentric load determining means judges whether the eccentric load can be allowed again at the second rotational speed, and if it is unacceptable, drops the rotational speed of the drum under the control of the operation control means so that the laundry cannot be loaded. After loosening, restart the operation of dehydration. In this way, at the time of performing the second operation of dewatering, since the laundry is partially dewatered, the judgment result is hardly different between the first eccentric load determining means and the second eccentric load determining means. Therefore, since the determination operation by the second eccentric load determination means is substantially meaningless at the time of the second operation of dehydration, it may be omitted and shifted to the high speed dewatering operation.

On the other hand, the increase in the eccentric load according to the progress of dehydration of the laundry is particularly noticeable when the eccentric load is reduced by intentionally applying a load to the drum in addition to the load of the laundry. This is because, while laundry is reduced in weight by dehydration, the weight of the load intentionally added to the drum is usually not reduced. Therefore, the drum type washing machine according to the fifth aspect of the invention is particularly effective in the configuration including a balance adjusting means for generating a load on the drum that cancels the eccentric load caused by the deflection of the laundry in the drum. As such a balance adjustment means, the balancer etc. which deliberately adjusted the quantity and the position of the liquid which accumulate in the partition chamber divided into multiple in the circumferential direction of a drum as mentioned later can be considered, for example.

Thus, according to the drum type washing machine which concerns on 5th invention, the vibration by the eccentric load which increases as water is drained from laundry can be prevented reliably. In addition, since the determination of the eccentric load is omitted in a situation where there is no fear of such an increase in the eccentric load, the operation of dehydration can be speeded up, and the dehydration time can be prevented from lasting unnecessarily long.

In accordance with a sixth aspect of the present invention, there is provided a drum type washing machine for dewatering laundry by rotating a drum containing laundry thereon at a high speed about a horizontal or inclined shaft, the motor driving a drum for rotating the drum, and a PWM drive. A drum type washing machine comprising motor driving means for controlling a rotational speed of the motor by controlling a duty ratio of a signal,

a) until the centrifugal force acting on the laundry in the drum reaches the first rotational speed exceeding gravity, the duty ratio setting control is performed to sequentially change the duty ratio of the PWM drive signal, and the drum rotational speed After the first rotational speed reaches the first rotational speed and the rotation control means for starting to switch to the set speed control,

b) first eccentric load determination means for judging whether or not the magnitude of the eccentric load due to the deflection of the laundry can be tolerated based on the actual variation in the rotational speed of the drum after switching from the duty ratio setting control to the speed control. and,

c) second eccentric load determination means for judging whether the magnitude of the eccentric load in the state of rotating the drum at a second rotational speed higher than the first rotational speed and lower than the resonance rotational speed corresponding to the resonance point is acceptable; ,

d) when the magnitude of the eccentric load can be permitted by the second eccentric load determining means, the drum is rotated at a third rotational speed at which the drum rotates at a third rotational speed at which the water is released from the laundry while being higher than the resonance rotational speed; Third eccentric load determination means for determining whether the magnitude of the eccentric load in the state can be allowed;

e) When performing dehydration operation for the first time after the start of dehydration administration, if it is determined by the third eccentric load determining means that the magnitude of the eccentric load cannot be tolerated, the rotation speed of the drum is lowered to loosen the laundry. If the dehydration operation is again performed, and if it is determined by the third eccentric load determination means that the magnitude of the eccentric load is allowed, control is performed to shift to the high speed dewatering operation, and the operation of the dehydration operation is restarted. When performing the operation of dewatering after the second time by trial, it is characterized by including operation control means for controlling so as to omit the determination operation by the first eccentric load determination means.

In the drum type washing machine according to the sixth invention, the eccentric load caused by the extreme pulling of the laundry is determined by the same method as the fourth invention, and water is removed from the laundry by the same method as in the fifth invention. The eccentric load generated by the balance of the load is judged. When the dehydration operation is performed for the first time after the start of dehydration administration, the determination operation by the first eccentric load determining means is executed, but in the state where it has passed through it to dewatering part of the laundry, for example, the magnitude of the eccentric load therefrom. Even if it is determined that the state is unacceptable and proceeds to the retry of the dehydration operation after the laundry is released, the extreme pulling of the laundry is unlikely to occur. This is because the laundry assumed in the first eccentric load determining means is extremely agglomerated because the laundry is sufficiently filled with water and there is no room for air to enter the gap between the laundry. In addition, since the original laundry tends to loosen in a state in which water is somehow drained from each laundry, the overshoot of the rotational speed when switching from the duty ratio setting control to the speed control is relatively small and the first eccentric load In the determination means, it is sometimes difficult to make an accurate determination. Therefore, the quick dewatering operation can be performed by omitting the judgment operation by the first eccentric load determining means that is almost unnecessary during the second and subsequent dehydration operation operations.

Thereby, in the drum type washing machine which concerns on 6th invention, it can transfer to high speed dewatering operation as quickly as it is, without performing unnecessary control in case of restarting dehydration operation. Therefore, the time required for dehydration operation can be shortened.

In the seventh invention made in order to solve the said subject, in the drum type washing machine which spins the drum which accommodated laundry to a high speed about a horizontal or inclined axis | shaft, dehydrates the said laundry,

a) balance adjusting means for generating a load on the drum to offset the eccentric load caused by the deflection of the laundry in the drum;

b) Detecting the eccentric load due to the load of the laundry while the drum is being rotated at the first rotational speed at which the centrifugal force acting on the laundry in the drum becomes greater than gravity and lower than the resonance rotational speed corresponding to the resonance point. Balance adjustment execution means for performing balance adjustment so that the eccentric load is reduced by the balance adjustment means when the eccentric load is large;

c) in the drum axial direction on the basis of a change in the actual acceleration in the process of controlling to raise the rotational speed of the drum with a substantially constant acceleration within the range of the rotational speed higher than the first rotational speed and lower than the resonance rotational speed. By determining the index value reflecting the distribution of laundry in Esau and determining whether the index value exceeds a predetermined threshold value, it is determined whether or not the occurrence of abnormal vibration is high due to the inclination of the distribution of the laundry in the drum axial direction. First eccentric load determining means for determining;

d) second eccentric load determination means for judging whether or not the magnitude of the eccentric load can be allowed while the drum is being rotated at a second rotational speed at which the water drains from the laundry after the balance adjustment is performed; ,

e) When the eccentric load is reduced by the execution of the balance adjustment, the rotational speed of the drum is raised from the first rotational speed, and the determination by the first eccentric load determination means is performed, whereby the possibility of occurrence of abnormal vibration is generated. If the rotational speed of the drum is increased to the second rotational speed when it is judged to be low, and the magnitude of the eccentric load cannot be accepted by the second eccentric load determination means, the rotational speed of the drum is lowered to loosen the laundry. It is characterized in that it is provided with operation control means for controlling to shift to a high speed dewatering operation when the magnitude | size of an eccentric load is allowable, while reoperating after dehydration operation | movement again.

In the drum type washing machine according to the seventh aspect of the invention, after adjusting the balance to reduce the eccentric load due to the deflection of the laundry in the drum, the possibility of occurrence of abnormal vibration due to the distribution of the laundry in the drum axial direction is determined. Then, after it is judged that there is no problem, it is determined at this time whether water is released from the laundry and the balance of the load in the drum is broken, which may cause abnormal vibration. In the process of increasing the rotational speed of the drum as described above, determinations relating to various factors that may cause abnormal vibrations are sequentially performed. Therefore, there is almost no risk of abnormal vibrations during the high speed dewatering operation, and very smooth high speed dehydration is performed. It can be accomplished.

An eighth invention made to solve the above problems is an outer housing, an outer passage formed inside the outer housing, a drum rotatably formed about a horizontal or inclined axis inside the outer cylinder, and laundry in the drum. In the drum type washing machine having an outer cylinder lid formed in the outer cylinder for opening and closing the opening formed in the outer cylinder for putting in and out;

In order to support the outer cylinder, two dampers having a lower end and an upper end fixed to the outer cylinder side are formed on the side of the supporting part formed at the lower part of the outer housing, and the two dampers have the drum axis therebetween when viewed from above. It is characterized by being formed so as to be in a positional relationship which is located at both sides, and is substantially orthogonal to the axis | shaft.

In the structure supporting the bottom of the outer layer with a vibration absorbing damper, the damper has a function of absorbing the vibration of the outer cylinder to prevent it from being transmitted to the outer housing, but the vibration not absorbed by the damper to the outer housing through the support portion Since it is transmitted, the damper can also be seen as a transmission of vibration from the outer cylinder to the outer housing. In the drum type washing machine according to the eighth aspect of the invention, since only two dampers support the lower portion of the outer cylinder having a substantially cylindrical circumferential surface, the transmission portion of vibration is reduced by that, and the outer cylinder is caused by, for example, the washing of the laundry in the drum. Even in this case of vibration, vibration of the outer housing can be suppressed. On the other hand, as a specific aspect, the two dampers can be formed in a substantially same vertical plane. Moreover, it can be set as the structure which arrange | positions the two dampers in substantially "H" shape.

When supporting an outer cylinder with two dampers as mentioned above, since it is difficult to balance, it is necessary to consider the weight balance of an outer cylinder further. Accordingly, as an embodiment of the eighth aspect of the invention, a drive source for driving the shaft is attached to an outer surface of an outer cylinder located outside of one end face of the drum, and the two dampers correspond to the center in the drum axial direction. It is preferable to set it as the structure formed shifting to the attachment position side of the said drive source rather than the position to be performed.

In this case, there is no problem when the drum is empty, but when a predetermined amount of water is injected into the outer cylinder for washing, the weight on the side opposite to the attachment position of the driving source increases relatively from the attachment position of the damper. There is a possibility that the sink will increase and the outer cylinder will tip.

Therefore, Preferably, it is good to make it the structure provided with the spring for pulling upward the upper part of the said outer cylinder which is the opposite side to the attachment position side of the said drive source in the said outer cylinder. With this configuration, even when water is injected into the outer cylinder, the outer cylinder can be kept almost horizontal.

In addition, in order to maintain the posture of the outer cylinder, a plurality of springs having a small modulus of elasticity connecting the upper side of the outer cylinder and the outer housing may be provided.

According to this configuration, since the upper side of the outer cylinder is loosely supported by a plurality of springs, as described above, the attitude can be easily maintained even with two dampers. In addition, since each spring has a small modulus of elasticity, vibration of the outer cylinder is difficult to propagate to the outer housing, which is advantageous for suppressing vibration of the outer housing. However, when the attachment positions of the plurality of springs are close, the effect of reducing the modulus of elasticity becomes less. Therefore, connecting to the outer cylinder and the outer housing as far as possible from each other, such as the front side and the rear side of the outer cylinder, for example. desirable.

The ninth invention made to solve the above problems is an outer housing, an outer passage having a drum rotatably therein, and a plurality of lower ends fixed to a supporting portion formed at a lower portion of the outer housing to support the outer cylinder. In the drum type washing machine provided with a damper,

The damper is fixed to the upper and lower ends of the damping plate through a vibration absorbing elastic member for mounting a metal mounting plate respectively fixed to the outer cylinder and the outer housing, and at least between the elastic member and the mounting plate toward the central portion, the attachment And a protective sheet member for preventing the edge of the plate from penetrating into the elastic member.

In particular, when the number of dampers supporting the outer cylinder is small, such as the drum type washing machine according to the eighth invention, the force applied to one damper when the outer cylinder is vibrated increases the force that the attachment plate presses against the elastic member and breaks. At the same time, the direction of action of the force becomes more complicated. Therefore, the edge of the attachment plate tends to dig into the elastic member, but according to the drum type washing machine according to the ninth invention, the edge of the attachment plate is directly attached to the elastic member by inserting a protective sheet member between the attachment plate and the elastic member. Contact can be avoided. Therefore, it is possible to reliably prevent the above-mentioned digging, whereby the breakage of the elastic member is less likely to occur, thereby achieving high reliability.

On the other hand, at least the protective sheet member is inserted between the elastic member facing the central portion side and the attachment plate because the elastic member located at the central portion side of the damper receives more force when the outer cylinder vibrates, so that the end of the damper Naturally, the protective sheet member may be inserted between the elastic member located on the side and the attachment plate.

The tenth invention made to solve the above problems is an outer housing, an outer passage having a drum rotatably therein, and a plurality of lower ends fixed to a supporting portion formed at a lower portion of the outer housing to support the outer cylinder. In a drum type washing machine having two dampers,

The upper end and the lower end of the damper each have two vibration absorbing elastic members in a compressed state between a metal attachment plate fixed to an outer cylinder or an outer housing and two washers applied to the damper above and below the attachment plate. The size of the washer and the elastic member is fixed to the attachment plate, and the size of the washer and the elastic member is determined with a dimensional allowance such that the elastic member is not pushed out more than the circumferential edge of the washer even when the elastic member is compressed and deformed during the operation of the washing machine. It features.

As described above, when the force applied to one damper increases when the outer cylinder vibrates, the compressive deformation of the elastic member also increases. In the drum type washing machine according to the tenth aspect of the invention, since the size of the washer and the elastic member is determined and the size of the washer and the elastic member are determined so as not to be pushed out from the circumferential edge of the washer in close contact with the elastic member, It does not rise to the edge of the peripheral edge of the washer. Therefore, breakage of the elastic member is unlikely to occur. In addition, when a part of the elastic member is removed from the washer, the elastic force of the elastic member is reduced to weaken the effect of vibration absorption, but it is always possible to ensure a high vibration suppression effect because such a phenomenon does not occur.

Embodiment of the invention

Hereinafter, a drum type washing machine according to an embodiment of the present invention will be described with reference to FIGS. 1 to 13.

1 is an external perspective view of a drum type washing machine of this embodiment. In this drum type washing machine, the outer housing 1 is formed in such a manner that the front surface of the outer housing 1 has a gentle curved shape, and the laundry inlet 3 is formed in the portion thereof. The laundry inlet 3 is freely opened and closed by the upper lid 2 which is slidably moved in the front and rear directions, and the rear side as shown by the arrow in FIG. 1 is grasped by the handle 4 formed at the front edge of the upper lid 2. The laundry inlet 3 can be opened. At this time, the upper lid 2 is housed in the back side inside the outer housing 1. On the left side of the upper lid 2, a detergent container 5 freely drawn outward is drawn, and on the right side, an operating panel 6 is formed by stretching in the front-rear direction. On the operation panel 6, various operation keys for setting a driving course, a reservation time, and the like, and lighting according to these settings, reporting the progress of the washing administration, or displaying the remaining time of reservation or driving, etc. Various indicators for dispersing are appropriately arranged.

Next, with reference to FIG. 2 and FIG. 3, the internal structure of the drum type washing machine of a present Example is demonstrated. 2 is a front longitudinal cross-sectional view of the inner recess, and FIG. 3 is a left side view of the inner recess. 2 and 3, description of the outer housing 1 which forms an external shape is abbreviate | omitted.

On the support part 7, a plurality of outer cylinders 10 having a circumferential surface substantially cylindrical and almost closed at both ends are suspended from the left and right upper sides in a state in which cross sections face the left and right sides of the outer housing 1, respectively. Two springs 11 and two dampers 12 which support the lower portion of the outer cylinder 10 in the front-rear direction, are suitably swingable. Inside the outer cylinder 10, a horizontal drum 13 in which both end surfaces of a substantially cylindrical circumferential surface in which a plurality of passage holes are drilled is almost occluded, is centered on the horizontal axis C extending in the left and right directions. Rotating freely.

The main shaft 14 fixed to the center of the left end face of the drum 13 is supported by a bearing 17 held in a first bearing case made of aluminum die-cast fixed to the left end face of the outer cylinder 10. Supported. On the other hand, the auxiliary shaft 15 fixed to the center of the right end surface of the drum 13 is supported by the bearing 19 held by the second bearing case 18 fixed to the right end surface of the outer cylinder 10. . The horizontal axis C is formed by the main axis 14 and the auxiliary axis 15.

The rotor 20b of the drum motor 20, which is an outer rotor-type DC motor, is fixed to the tip of the main shaft 14 protruding laterally from the left end surface of the outer cylinder 10, and on the other hand, a first serving as a motor stage. The stator 20a of the drum motor 20 is fixed to the bearing case 16. When the drive current is supplied to the stator 20a from the control part described later, the rotor 20b rotates accordingly, and the drum 13 is rotated at the same rotational speed as the rotor 20b via the main shaft 14.

The outer cylinder opening 101 for inserting and extracting laundry is formed in a position coincident with the laundry inlet of the outer housing over the inclined front from the upper portion of the outer surface of the outer cylinder 10, and the outer cylinder opening 101 is It can be opened and closed by the outer cylinder door 102. In addition, a drum opening 131 is formed on the circumferential surface of the drum 13 to insert and remove laundry, and the drum opening 131 is opened and closed by a drum door 132 composed of two door bodies having a French door structure before and after. It is possible. Since the drum 13 is rotatable, the drum is placed below the stator 20a so that the drum 13 remains stationary at a position where the drum opening 131 is radially coincident with the outer cylinder opening 101. The lock mechanism part 21 is formed, and the locking pin which advances from this drum lock mechanism part 21 fits into the locking groove part 22 formed in the outer edge part of the rotor 20b, and the drum 13 is a predetermined position. Is fixed to.

In addition, on both end faces of the drum 13, in order to suppress the vibration of the drum 13 due to the eccentric load caused by the deflection of the laundry when the drum 13 is rotated at a high speed during the dehydration operation, an annular balance is provided. The seal 24 is attached. The vibration suppression operation using the balance chamber 24 will be described later. On the other hand, although not described in FIGS. 2 and 3, a heating / blowing device including a fan motor and a drying heater is disposed outside the right side of the drum 13 so as to send the drying air into the drum 13.

4 is an electric system configuration diagram of main parts of the drum type washing machine of the present embodiment. The control unit 30 is mainly composed of a microcomputer including a CPU, a ROM, a RAM, a timer, and the like, and is based on a control program stored in a ROM, and each step of washing, rinsing, dehydration and drying as described later. Various control for carrying out the operation operation of the controller is executed.

The control unit 30 is provided with a key input signal from the operation unit 6a formed on the operation panel 6 in order to give the user various settings or instructions, and at the same time detects the water level of the water stored in the outer cylinder 10. The sensor 33 and the temperature sensor 34 for detecting the temperature of the water stored in the outer cylinder 10 or for detecting the temperature of the drying wind during the drying operation, are embedded in the drum lock mechanism 21 to determine whether the drum is locked. Detection signals are respectively input from the drum lock detection unit 21b or the like for detecting whether the device is in the released state.

The inverter 30 is connected to the control part 30, and receives the signal from the rotation sensor 20c which generate | occur | produces the pulse signal synchronized with rotation of the drum motor 20, and receives the drum motor through the inverter drive part 32. FIG. The rotation of 20 is controlled. In addition, a load driver 31 is connected to the control unit 30, and the fan driver 35, the drying heater 37, and the outer cylinder 10 included in the heating / blowing device are provided through the load driver 31. Water heating heater 36 for heating the stored water, water supply valve 38 for controlling the water supply into the outer cylinder 10, drain valve 39 for controlling the drainage in the outer cylinder 10, drum The lock mechanism unit 21 controls the operation of the drum lock and the torque motor 21a as a driving source for releasing the lock. The control unit 30 also sends a display signal to the display unit 6b so as to display according to the operation of the operation unit 6a or display for informing the driving progress status.

Next, a supporting structure of the outer cylinder 10, which is one of the features of the drum type washing machine of the present embodiment, will be described with reference to FIG. 5 is a front perspective view (A), a top perspective view (B), and a right side perspective view (C) schematically showing the supporting structure of the outer cylinder. As described above, in the drum type washing machine, the outer cylinder 10 has one front side damper 12a and one rear side damper (1) for the supporting portion 7 constituting the bottom of the outer housing 1. It is supported by the two dampers 12 of 12b) in total, and the upper part of the outer cylinder 10 is suspended by six springs 11a-11f.

The fixing points of the two dampers 12a and 12b are approximately in a straight line in the front-rear direction, and are formed from the center to the left in the left-right direction (that is, the stretching direction of the horizontal axis C of the drum 13 = axial direction). It is. This is because the motor 20 is attached to the left end surface of the outer cylinder 10, whereby the weight balance of the outer cylinder 10 in the left and right directions is leaned to the left. However, when the laundry is accommodated in the drum 13 and water is stored in the outer cylinder 10, the fixing positions of the dampers 12a and 12b are directed to the left side, and therefore, the outer cylinder 10 due to the weight of the laundry and water. The right side of) tends to sink larger than the left side. In order to prevent the outer cylinder 10 from falling down at that time and to keep the outer cylinder 10 substantially horizontal, the upper right portion of the outer cylinder 10 is pulled up by the spring 11f. In addition, five springs 11a to 11e other than the spring 11f are for maintaining the posture of the outer cylinder 10.

The spring constant of these six springs 11a-11f is set smaller than what is conventionally used for this type of drum type washing machine. This is because, when the spring constant is large, the vibration of the outer cylinder 10 can be easily transmitted to the outer housing 1 by that much. In addition, even if the spring constant is small, if the attachment position of the spring (particularly, the attachment position on the outer housing 1 side) is close, it is equivalent to the presence of one spring in which the spring constants of the plurality of springs are added together. In order to avoid, the attachment positions of the springs 11a to 11f are considered to be separated from each other as much as possible.

As described later, in particular, when there is a large eccentric load due to the tendency of the laundry contained in the drum 13 during centrifugal dehydration, the drum 13 tries to vibrate and is large in the outer cylinder 10 that supports it at both ends. The vibration is propagated. The dampers 12a and 12b absorb this vibration and reduce radio waves to the outer housing 1. Since the vibrations that could not be absorbed by the dampers 12a and 12b propagate to the outer housing 1 and cause the outer housing 1 itself to vibrate, when the number of dampers is small, the amount of vibration to the outer housing 1 is increased. The propagation is less and is effective in suppressing the vibration of the outer housing 1. Since this drum type washing machine supports the bottom part of the outer cylinder 10 only by the two dampers 12 as mentioned above, the propagation of the vibration to the outer housing 1 is suppressed to the minimum, and the vibration of the outer housing 1 is suppressed. Can be made small.

On the other hand, if the outer cylinder 10 vibrates at the time of rotation of the drum 13, a larger force acts on each damper 12 that absorbs this vibration than in the conventional case (three dampers). Therefore, assuming that such a large force acts, the damper 12 itself employs a structure which further enhances durability. Next, the structural features of the damper 12 in this drum type washing machine will be described. 6 is a longitudinal sectional view of the damper 12 in a mounted state.

The damper 12 is a so-called hydraulic damper, and includes a cylindrical cylinder 120 sealed with oil therein, a rod 121 connected to a piston (not shown) slidable in the cylinder 120 in an axial direction, The coil spring 122 is installed between the spring supporting plate 123 fixed to the rod 121 and the upper end of the cylinder 120. A shaft 124 is formed in the upper portion of the rod 121, and a screw groove 125 is formed in the upper end portion, and an axis protruding downwardly from the cylinder 120 opposite to the protrusion direction of the rod 121. Similarly, the flange 127 and the threaded groove 128 are formed in the 126.

Although not shown in FIG. 6, the metal upper mounting plate 50 is fixed to the outer cylinder 10 with a screw. At the upper end of the rod 121 of the damper 12, a rubber annular cushion 53 is inserted between the dish washer 52 and the upper mounting plate 50 which are fixed to the flange 124, Another cushion 56 is inserted between the flat washer 54 and the upper mounting plate 50, which is fixed by the nut 55 screwed into the screw groove 125, whereby the upper portion of the damper 12 is attached to the upper mounting plate. It is fixed to the outer cylinder 10 via 50. Similarly, the lower end of the shaft 126 of the damper 12a is similarly inserted with a cushion 60 between the washer 59 and the lower mounting plate 51 fastened to the flange 127, and the screw groove 128. The other cushion 63 is inserted between the washer 61 and the lower mounting plate 51 which are fixed by the nut 62 screwed on it, whereby the lower part of the damper 12 is supported by the lower mounting plate 51. It is fixed to the part 7. On the other hand, in this example, all of the cushions that are elastic members of the present invention use natural rubber having a hardness of 40 degrees.

One characteristic point here is that the annular protective sheets 57 and 64 are inserted between the upper mounting plate 50 and the cushion 53 and between the lower mounting plate 51 and the cushion 60, respectively. It is. The protective sheets 57 and 64 have a thickness of about 1 mm made of polypropylene resin, for example, and the inner diameter thereof is substantially the same as the outer diameter of the protrusions of the cushions 53 and 54. Since the opening hole diameters of the upper mounting plate 50 and the lower mounting plate 51 are larger than the outer diameters of the protrusions of the cushions 53 and 54, the upper mounting plate 50 and the lower mounting plate 51 are as shown. A slight gap 58 is formed between the inner surface of the opening of the opening and the outer surface of the protrusions of the cushions 53 and 54.

Thereby, the corner of the inner surface of the opening hole of the upper mounting plate 50 and the lower mounting plate 51 can be prevented from directly contacting the cushions 53 and 54. Therefore, even when the outer cylinder 10 vibrates and a force that oscillates the damper 12 acts, the corners (and some burrs, etc.) of the inner surface of the opening hole of the upper mounting plate 50 and the lower mounting plate 51 are kept. The penetration into the cushions 53 and 54 can be reliably prevented.

As another feature, the outer diameters of the dish washers 52, 59 and the flat washers 54, 61 are larger than the outer diameters of the cushions 53, 56, 60, 63 in close contact therewith. The margin of dimension here is determined in advance in consideration of the deformation of the cushion when a large force for rocking the damper 12 is applied, and the cushion is not pushed outward from the circumferential edge of the washer even by the deformation. All. Specifically, the outer diameters of all the cushions are 37.5 mm, whereas the outer diameters of the flat washers 54 and 61 are 42 mm, and the outer diameters of the dish washers 52 and 59 are 43 mm. Here, the outer diameters of the dish washers 52 and 59 are made larger than the flat washers 54 and 61 as seen from the attachment plates 50 and 51 when the damper 12 absorbs the swing as described above. Most force is applied to the cylinder 120 side, and the deformation side of the cushions 53 and 60 located on the cylinder 121 side (center part side) is compared with the deformation of the cushions 56 and 63 located on the end side. Because it is much larger.

Thus, since the damper 12 employ | adopted in this drum type washing machine has a big force acting, and even if a cushion is deformed largely in order to absorb this, an attachment plate does not penetrate into a cushion and since a cushion does not push out from a washer, Damage to the cushion can be prevented and long life can be achieved. Further, when the cushion is pushed out of the washer, the shock absorbing force of the cushion is reduced by that amount, but since such a cushion does not occur, the vibration of the outer cylinder 10 can be effectively absorbed to suppress the vibration.

Next, vibration suppression using the balance chamber 24 in the drum washing machine will be described with reference to FIG. 7. The balance chamber 24 is an annular hollow body in which a predetermined amount of liquid (calcium chloride solution, etc.) is enclosed, and therein, the partition walls 242 extending in an L shape from the outer circumferential wall surface 241 are spaced at predetermined angles. It is formed radially. This partition 242 prevents free movement of the liquid enclosed therein. Therefore, when the drum 13 rotates at a sufficiently high rotational speed, in some compartment 244 formed between the adjacent partition walls 242, water adheres to the outer peripheral wall surface 241 side by centrifugal force. It does not move to other compartment 244.

When the drum 13 is rotated at a rotational speed at which the centrifugal force acting on the liquid enclosed in the balance chamber 24 exceeds the weight, the liquid is concentrated on the outer circumferential side in each compartment 244 and in each compartment 244. maintain. That is, since the movement of the liquid between the compartments 244 does not occur, each compartment 244 can be regarded as having added a weight to each position by the weight of the liquid held therein. Therefore, when the same amount of liquid is held in all the compartments 244, the eccentric load by the balance chamber 24 does not exist.

In contrast, when the liquid is held in the compartment in the locally biased position, unbalance is generated around the rotational axis by the balance chamber 24, so that an eccentric load exists. Therefore, when the laundry is rotated in the circumferential direction while the laundry is rotated while the laundry adheres to the inner circumferential wall surface of the drum 13, the eccentric load and the balance caused by the laundry are unbalanced. If the eccentric load of the balance chamber 24 is intentionally produced at the correct position, the eccentric load of the drum 13 as a whole can be reduced, and the eccentric load can be made small so that the eccentric load can be neglected.

Therefore, at the start of the dehydration operation, the drum 13 is rotationally driven at a rotational speed such that the centrifugal force acting on the liquid in the balance chamber 24 is substantially balanced with gravity. At this time, the liquid existing on the outer circumferential side in each of the compartments 244 of the balance chamber 24 adheres to the inner circumferential side by the centrifugal force, and the liquid present on the inner circumferential side of the respective compartments 244 falls by gravity to form a different compartment ( 244). For this reason, when the drum 13 is rotated at the said rotational speed for a while, the quantity of the liquid which exists in all the compartments 244 can be made about the same. In this state in which the liquid amount is averaged, the eccentric load by the balance chamber 24 becomes almost zero, and only the eccentric load W due to the deflection of the laundry becomes the eccentric load of the entire drum 13 (FIG. 7A).

Next, by slightly increasing the rotation speed of the drum 13, the centrifugal force applied to the liquid held in each compartment 244 is increased to stabilize the liquid holding state. Then, based on the subtle fluctuations in the rotational speed of the actual drum 13 (or the rotor 20b) in the state of controlling to keep the rotational speed constant, the amount and position of the eccentric load of the drum 13 as a whole are detected. Therefore, when the eccentric weight exceeds the allowable value, the rotational speed of the drum 13 is decelerated for a short time with timing according to the detected eccentric load position. Then, since the centrifugal force acting on the liquid decreases, as shown in FIG. 7B, the liquid overflows from the partition chambers 244a, 244b, 244c that are lifted upward of the drum 13, and the dropped liquid has a different liquid. Flows into the compartment.

On the other hand, just before deceleration, as shown in FIG. 7A, in the compartment located above the rotation, the liquid tends to overflow relatively, whereas in the compartment that passes through the rotation above and moves downward, Since the protrusion 243 of the partition 242 prevents the liquid from overflowing, the liquid is in a difficult state to overflow. Therefore, when decelerating temporarily as mentioned above, although the liquid overflows in the compartment which is lifted upward and the compartment which is already located upward, the liquid in the compartment which is going to progress below rotation overflows. Maintained without falling off. Therefore, the liquid only in the desired compartment can be reliably dropped.

By repeating this deceleration operation one to several times, as shown in Fig. 7C, there is almost no liquid in the compartments 244a, 244b and 244c near the position where the eccentric load W due to the washing of the laundry is present. The amount of liquid in the compartment 244d located on the opposite side and the compartment adjacent thereto increases. Thereby, the eccentric load of the drum 13 whole becomes small by the balance of the eccentric load of the balance chamber 24 and the eccentric load by laundry.

In the drum type washing machine of the present embodiment, the intermediate dewatering is performed after the rinsing stroke except for the washing stroke or the final rinsing with detergent water, and the final dehydration is performed after the final rinsing. Next, the drum rotation control for suppressing the vibration in the dehydration stroke will be described.

First, the cause of the vibration which may arise at the time of dehydration administration is demonstrated. Normally, if there is unbalance of mass around the rotation axis when the drum 13 rotates at high speed, it can be considered that there is a load of any weight at any position on the circumference of the drum 13. This is the eccentric load W described above. However, in the case where the drum 13 has a dimension that is somewhat long in the axial direction as in the present drum type washing machine, and the drum 13 is placed horizontally (when the drum 13 is inclined, the laundry moves along the inclination), the drum 13 In addition, it is also necessary to consider how the laundry is dispersed (or agglomerated) in the axial direction in the drum 13.

8A-1 and B-1, in the circumferential direction of the drum 13, two bundles of laundry W1 and W2 are present at opposite positions with their axes interposed therebetween. Considering only the centrifugal force acting, the eccentric load of the entire drum 13 is almost zero by the balance of both. However, in the case of seeing the dispersion of the laundry in the axial direction of the drum 13, in Fig. 8A-2, the bundles W1 and W2 of the two laundry are present at opposite positions on a plane substantially perpendicular to the axis. In contrast, in Fig. 8B-2, the bundles W1 and W2 of the two laundry articles exist at positions separated from both end faces of the drum 13, respectively. In the former case, the centrifugal forces acting on W1 and W2 are almost balanced, while in the latter case, the centrifugal forces acting on W1 and W2 are not coplanar, so they are not balanced and cause the drum 13 to swing largely. Works. Here, the eccentric load due to the load of the laundry in the drum circumferential direction is simply referred to as the eccentric load and the eccentricity due to the arrangement of the laundry facing each other in the axial direction.

That is, in order to suppress vibrations in the drum 13, the outer cylinder 10, and the outer housing 1 as much as possible, it is necessary not only to reduce the eccentric load caused by the deflection of the laundry, but also to consider the counter-eccentricity.

In addition, it is also necessary to consider the weight change when water is removed from the laundry as the dehydration progresses. That is, at the start of dehydration, each laundry is sufficiently filled with water, and as described later, liquid movement in the balance chamber 24 is performed so that the eccentric load becomes smaller in the state before the water is almost discharged from the laundry. When water proceeds and the water is removed from the laundry, the weight of the laundry decreases significantly, while the weight balance in the balance chamber 24 does not change, so that the eccentric load may increase in some cases. In particular, when laundry which differs greatly in water absorption and dewatering rate is mixed, and when it is concentrated, there is a high possibility that the eccentric load will increase with the progress of dehydration.

Therefore, in the drum type washing machine of the present embodiment, after considering various conditions that may cause vibration in the dehydration operation as described above, the vibration is suppressed as much as possible, and the outer cylinder 10 is abnormally shaken during driving, for example, so that the outer housing (1) It prevents an abnormal noise from colliding with an inner wall or vibrating the outer housing 1 itself.

9-11 is a flowchart which shows the control procedure at the time of dehydration operation. 13 is a graph which shows the schematic change of the drum rotation speed at the time of dehydration operation.

First, when the dehydration stroke is started, the control section 30 sets the PWM duty ratio instructing the inverter drive section 32 to 18/255 as an initial value in order to rotationally drive the drum 13 in the stopped state. Thereby, the drive current according to this PWM duty ratio is supplied to the stator 20a of the motor 20 (step S10). At this time, the torque generated in the rotor 20b is a degree necessary to start the rotation of the drum 13 when the load is extremely small.

Thereafter, the control unit 30 monitors the rotation pulse signal output in accordance with the rotation of the rotor 20b by the rotation sensor 20c, and determines that the motor 20 is locked when the rotation pulse signal is not obtained. (YES in step S11), the PWM duty ratio is increased by 4/255. Then, it waits until 0.15 second passes in that state (step S12), and returns to step S11. Thus, until the drum 13 starts to rotate, the PWM duty ratio is increased by 4/255 every 0.15 seconds by the repetition of the processing of steps S11, S12, and S13, so that the torque of the motor 20 is gradually increased. Increases.

If it is determined in step S11 that the motor 20 is not locked, the control unit 30 determines whether the rotation speed of the drum 13 has reached 60 rpm (step S14), and if it has not yet reached 60 rpm, The PWM duty ratio is increased by 1/255 (step S15). Then, it waits until 0.3 second has passed in that state (step S16), and returns to step S14. Therefore, the PWM duty ratio is increased by 1/255 every 0.3 seconds by the repetition of the processing of steps S14, S15, S16 until the drum 13 starts to rotate and the rotational speed reaches 60 rpm. As a result, the torque of the motor 20 gradually increases.

The centrifugal force acting on the laundry accommodated in the drum 13 increases as it is located at the outer circumferential side, that is, the position closer to the inner circumferential wall surface of the drum 13. Here, the centrifugal force acting on the laundry exceeds gravity and sticks to the inner circumferential wall surface of the drum 13, and the rotation speed at which it starts to rotate with its rotation is 55 to 65 rpm, but as described above, the torque of the motor 20 is gradually decreased. Increasing the rotational speed of the drum 13, the laundry relatively located on the inner peripheral wall surface of the drum 13 first adheres to the inner peripheral wall surface of the drum 13 by centrifugal force, and acts on the laundry located therein. Since the centrifugal force is still smaller than gravity, it moves in the drum 13, and when the drum 13 moves from the inner circumferential wall surface to the portion where the laundry is not still attached, a greater centrifugal force is applied there, which is different from the inner circumferential wall of the drum 13. Stick. In addition, in the case of laundry having a large area such as sheets, for example, the agglomerations in the beginning of rotation of the drum 13 spread out as the rotation speed of the drum 13 increases, so as to cover the inner circumferential wall surface of the drum 13. Stick. In this way, the laundry accommodated in the drum 13 is disperse | distributed suitably, or it disperse | distributes suitably, and it presses on the inner peripheral wall surface of the drum 13 by centrifugal force, and it becomes easy to rotate. This increases the possibility that the eccentric weight can be reduced.

If it is determined in step S14 that the rotational speed of the drum 13 has reached 60 rpm, the controller 30 determines whether or not there is an eccentric load detection execution completion flag F1 at the time of dehydration (step S17). As described later, since the flag F1 is reset at the start of each dehydration stroke, when the step F17 is reached for the first time after the start of the dehydration stroke, the flag F1 is in the reset state, and therefore the flow advances to step S18.

Then, from the control in which the value of the PWM duty ratio is fixed, it is switched to the speed control in which the PWM duty ratio is appropriately changed so that the rotational speed of the drum 13 becomes 70 rpm (step S18). In general, however, the PWM duty ratio at this point is larger than the PWM duty ratio for maintaining the rotational speed of 70 rpm. Therefore, even if the PWM duty ratio is changed, the rotational speed is not stabilized immediately, and as shown in Fig. 12, the state of overshoot exceeds 70 rpm. Even when the speed of rotation of the drum 13 rises as described above, if the laundry does not loosen again and there is a large eccentric load due to extreme pulling, the rotation speed of the drum 13 is greater than 70 rpm. Because of the rotational load, the rotational speed changes rapidly. On the other hand, when the eccentric load is relatively small, since the rotational load by the eccentric load is small, it takes time for the rotation speed of the overshoot drum 13 to drop.

Therefore, the control part 30 waits until 2 second has passed after switching to speed control (step S19), and determines whether the rotation speed became less than 70 rpm after 2 seconds passed (step S20). If it is 70 rpm or more, the process proceeds to step S22, and if it is less than 70 rpm, it is determined whether the state continues for 0.15 seconds or more (step S21). In step S22, it is determined whether 3 seconds have elapsed at the time 2 seconds has elapsed in step S19 (step S22), and if step 3 has not elapsed, the process returns to step S20.

As described above, in the case where there is a large eccentric load due to the extreme washing of the laundry in the drum 13, since the deceleration after switching to the speed control in step S18 is large, before 5 seconds have elapsed from the switching, It is likely that the rotation speed will be less than 70 rpm for 0.15 seconds or more (see FIG. 12). Therefore, in the case of YES in step S21, it is determined at this point that the eccentric load is too large, and the drum 13 is once decelerated (or once stopped) to move to the entanglement operation for dispersing the laundry.

When 3 seconds have elapsed in step S22, the eccentric check (eccentric check 1 in Fig. 13) of the first step executed by the processing of steps S18 to S22 is cleared. Here, the control part 30 changes the target value of speed control from 70 rpm to 80 rpm (step S23), and determines whether the actual rotation speed became 80 rpm (step S24). When the rotational speed reaches 80 rpm, the rotational speed is maintained to detect the eccentric load (step S25). At this time, almost all the laundry in the drum 13 is fully pushed by the inner peripheral wall surface of the drum 13 by centrifugal force, and the eccentric weight can be calculated very accurately.

On the other hand, the method for calculating the eccentric weight below here is based on the actual variation in the rotational speed when the drum 13 is controlled to maintain the rotational speed at 80 rpm. That is, when there is an eccentric load in the drum 13, when the eccentric load goes downward from the upper side of the drum according to the rotation of the drum 13, the eccentric load acts to accelerate the drum 13, and vice versa. When the drum is directed upward from below, the drum 13 is decelerated. Due to the acceleration and deceleration action, the rotational speed fluctuates slightly during the one rotation of the drum 13, so that the rotation sensor 20c at every equal rotation angle of the one rotation period of the drum 13 or the rotor 20b. By measuring the time interval of the obtained pulse signal, the eccentric weight can be estimated according to the detected speed change.

In this way, when the eccentric weight is detected, it is determined whether or not it is equal to or less than the predetermined value (step S26). If it exceeds the predetermined value, it is determined that there is a risk of abnormal vibration, and the process shifts to the loosening operation. When it is determined in step S26 that the eccentric weight is less than or equal to the predetermined value, the control unit 30 changes the target value of the speed control from 80 rpm to 100 rpm (step S27), and determines whether or not the actual rotation speed has reached 100 rpm. (Step S28). When the rotational speed reaches 100 rpm, the rotational speed is maintained to detect the position with the eccentric weight, and if necessary, the liquid moves in the balance chamber 24 by the same method as described above. The balance adjustment is executed (step S29). However, since there is a limit to the eccentric weight that can be adjusted for balance, for example, when the eccentric weight exceeds a certain value or when the eccentric weight does not become below a certain value even when a predetermined number of times of balance adjustment is attempted, the balance adjustment is performed. It judges that it has failed (NO in step S30), and transfers to an unlocking operation.

When it is determined that the eccentric weight is small when the rotation speeds of the drum 13 are 80 rpm and 100 rpm, or when the eccentric weight is reduced as a result of the balance adjustment, the eccentric check of the second stage (eccentricity in FIG. 13) Check 2) is cleared, and the processing proceeds from step S30 to S31.

The control part 30 measures the eccentric load weight P and the amount of inertia Q at a rotation speed of 100 rpm (step S31). Since the moment of inertia is substantially the same as measuring the mass of the drum 13 (including the weight of wet laundry), the energization to the motor 20 is cut off from the state in which the drum 13 is being rotated at 100 rpm. What is necessary is just to measure the time required for the rotation speed of the rotating drum 13 to fall to predetermined value (for example, 90 rpm) by an inertial force, and to calculate the amount of inertia moment according to the measurement time.

Then, the process of determining the determination threshold value H mentioned later according to the measured moment of inertia Q and eccentric weight P is performed. That is, if Q is 30 or less (YES in step S32) and P is 1000 or less (YES in step S33), the determination threshold value H is set to 180 (step S37), and Q is 30 or less and P exceeds 1000. If there is (NO in step S33), the determination threshold value H is set to 190 (step S38). If Q is greater than 30 but less than 60 (YES in step S34) and P is less than or equal to 700 (YES in step S35), the threshold threshold (H) is set to 165 (step S39), and Q is greater than 30 but less than 60 And P exceeds 700 (NO in step S35), the determination threshold value H is set to 175 (step S40). If Q is greater than 60 (NO in step S34) and P is less than or equal to 550 (YES in step S36), the decision threshold (H) is set to 150 (step S41), and Q is greater than 60 and P is greater than 550. If there is (NO in step S36), the determination threshold value H is set to 160 (step S42).

The controller 30 thus controls the inverter driver 32 in order to raise the rotational speed of the drum 13 with a constant acceleration after determining or in parallel with the determination threshold value H (step S43). When the rotational speed reaches 140 rpm (YES in step S44), the difference between the maximum value and the minimum value of the acceleration component of the motor rotation as the index value for estimating the degree of opposing eccentricity is hereinafter referred to as the acceleration fluctuation index value △. (Step S45).

Specifically, first, if the speed is constant while the rotor 20b of the motor 20 rotates once, the generation time interval of 72 pulse signals generated at equal intervals is acquired 120 times. This obtains information on the speed change during the period in which the drum 13 rotates about 1.7. For this 120 pieces of data, a moving average of 15 adjacent data in time is calculated. This gives 105 moving averages. Again, the moving average of the 15 adjacent data is calculated for the 105 data. In this way, the 90 second moving average values are obtained. Then, the differences of temporally adjacent ones are respectively calculated from these 90 moving average data, and the maximum and minimum values are found among the differences, and the difference between the maximum and minimum values is defined as the acceleration variation index value?. Of course, this is an example, and other values may be used depending on the variation in the acceleration of the actual drum 13 during the period in which the rotational speed of the drum 13 is controlled to increase with a certain acceleration.

In this washing machine, the rotation speed corresponding to the resonance point of the rocking mechanism part including the drum 13 and the outer cylinder 10 is about 250 rpm. Therefore, the vibration tends to increase as the rotation speed approaches 250 rpm, but especially when the rotation speed of the drum 13 exceeds 140 rpm, the effect of the counter-eccentricity starts to remarkably occur, and the eccentric load is small. Even the vibration caused by the counter-eccentricity starts to increase. If there is an opposite eccentricity, an uneven load is applied to the bearings 17 and 19 as the drum 13 rotates, and the rotation of the drum 13 is restrained by the friction or the like. Therefore, the larger the counter-eccentricity becomes, the more difficult the rotation of the motor 20 rises smoothly, and the greater the variation in acceleration in one rotation, that is, the acceleration variation index value DELTA. Therefore, it is possible to estimate the degree of eccentric opposition using the acceleration fluctuation index value [Delta].

However, the acceleration variation index value Δ is affected by not only the opposite eccentricity but also other factors. That is, when the weight of the entire drum 13 including laundry is large, that is, when the amount of inertia moment Q is large, the inertia force at the time of rotation of the drum 13 appears relatively large, so that the variation in acceleration becomes small. On the contrary, when the weight of the entire drum 13 including laundry is small, that is, when the amount of inertia moment Q is small, the variation in acceleration tends to be remarkable because the action of the inertia force is relatively small. On the other hand, when the eccentric load is large, the acceleration variation factor due to the eccentric load is additionally applied. Therefore, even if the same inertia moment amount and the opposite eccentricity are the same, the larger the eccentric load weight (P) is, It tends to be prominent. Therefore, considering the acceleration fluctuation index value? As dependent on the eccentric subweight P and the moment of inertia Q as described above, whether the acceleration fluctuation index value? Is in a range that can be tolerated. The determination threshold value H which is a criterion for determining is determined as described above.

That is, according to the processing of the above steps S34 to S44, as a general tendency, the determination threshold value H is made relatively small in consideration of the fact that the acceleration variation index value Δ becomes smaller as the amount of inertia moment Q is larger. The larger the deep weight P, the larger the acceleration variation index value Δ, and the larger the critical threshold value H is. In this way, the influence of the moment of inertia Q and the eccentric weight P can be reduced to accurately determine whether the degree of opposing eccentricity in the acceleration fluctuation index value? Is within the allowable range as vibration.

Returning to the flowchart of FIG. 10, after calculating the acceleration fluctuation index value? In step S45, it is determined whether or not the rotational speed of the drum 13 has reached 220 rpm (step S46). If 220 rpm is not reached, the controller 30 determines whether the acceleration variation index value Δ is equal to or greater than the determination threshold value H (step S47), and the acceleration variation index value Δ is the determination threshold value ( H) In case of abnormality, it is concluded that the degree of counter-eccentricity is large, and that abnormal vibration is likely to occur when the resonance point is reached. In that case, the rotational speed of the motor 20 is rapidly dropped to shift to the release operation.

On the other hand, when it is determined in step S47 that the acceleration variation index value Δ is less than the determination threshold value H, the flow returns to step S45, and the acceleration variation index value Δ is measured at a higher rotational speed than in the previous measurement. . And if the rotational speed has not yet reached 220 rpm, this acceleration fluctuation index value (DELTA) is compared again with the determination threshold value (H). Therefore, by the processing of steps S44 to S47, the repetitive acceleration fluctuation index value? Is measured in the range of 140 rpm to 220 rpm whose rotation speed is lower than the resonance point, and the acceleration fluctuation index value? When the determination threshold value H or more is reached, the rotation speed of the drum 13 is rapidly lowered by abandoning the increase in the rotation speed. Usually, the opportunity to repeat the process of step S44-S47 about 10 times in the range of 140 rpm-220 rpm is acquired. When the rotational speed reaches 220 rpm while the acceleration variation index value △ is less than the determination threshold value H, even if there is an opposite eccentricity, the degree can be assumed to be within the allowable range. The eccentric check 3) in FIG. 13 is cleared, and the rotational speed is further increased to transfer to high speed dewatering.

In this way, in the case of shifting to high speed dewatering, the rotation speed of the drum 13 passes through the speed range corresponding to the resonance point without causing such a large vibration to the outer cylinder 10. Thereafter, the controller 30 determines whether the rotational speed has reached 500 rpm (step S51), and if the rotational speed has reached 500 rpm, whether there is an eccentric load detection execution completion flag F1 at the time of dehydration. It is determined (step S52). As described above, since the flag F1 is reset at the start of the dehydration stroke, when this step S52 is reached for the first time after the start of the dehydration stroke, the flag F1 proceeds to step S53 as a reset state.

The control unit 30 controls the inverter drive unit 32 to maintain the rotational speed of the drum 13 near 500 rpm. The rotation speed at this time is lower than 800 rpm, which is the maximum rotation speed at the time of dehydration, but is a rotation speed that can squeeze the water contained in the laundry to a considerable extent. Therefore, the laundry in the drum 13 is lightly squeezed, whereby the weight of the laundry varies from the eccentric load detection and balance adjustment of steps S25 and S26.

On the other hand, since the eccentric load due to the ubiquitous of the liquid in the balance chamber 24 does not change, there is a possibility that the balance of the weight is broken and the eccentric load is increased by lightly washing the laundry. Therefore, the eccentric weight P2 is detected while the drum 13 is being rotated at 500 rpm, and it is determined whether or not the eccentric weight P2 is less than the predetermined value (steps S55, S56). If it is less than that, it is judged that there is no possibility of abnormal vibration even if the rotation speed is further increased to continue dehydration. In that case, the eccentric check (the eccentric check 4 in FIG. 13) of the fourth stage is cleared, and the control unit 30 raises the rotational speed of the drum 13 to 800 rpm (step S57), and the rotation thereof. The operation is terminated after sufficient high speed dehydration is performed (step S58) by maintaining the speed for a predetermined dehydration time.

On the other hand, when it is determined in step S56 that the eccentric load weight P2 is equal to or greater than the predetermined value, it is determined that the state of the eccentric load is greatly changed in accordance with the change in the weight of the laundry, so that the occurrence of abnormal vibration is high. In that case, after setting the eccentric load detection execution completion flag F1 at the time of dehydration (step S59), the control part 30 drops the rotational speed of the drum 13 to near stop, and transfers to a loosening operation. When shifting to the unwinding operation at any point in the above description, the drum 13 is rotated at a rotational speed (about 40 to 50 rpm) at which the laundry is stirred, and then dehydration operation is attempted again in the order starting from step S11. .

That is, when it is determined that the eccentric load is too large by the eccentric load determination after light dehydration, the eccentric load detection execution completion flag F1 at the time of dehydration is set in step S59. Therefore, in the case of retrying from dehydration operation again after finishing until light dehydration by the rotation speed up to 500 rpm, the flag F1 is set and it is determined in step S17 that the flag F1 is present. The processing of S18 to S22 passes and proceeds directly to step S23. That is, the eccentric check of the first stage near the rotational speed of 70 rpm is omitted. This has already been done by the process of light dehydration once, and the amount of water contained in the laundry is relatively small while air enters between the laundry and the cloth and is very easy to loosen, and the laundry is extremely in the drum 13. There can hardly be a situation that they are not agglomerated and dispersed, and the eccentric check of the first step by the processing of steps S18 to S22 is almost meaningless. By this omission, the execution of the dehydration operation of the second transition can be speeded up.

In addition, in the case of retrying from the dehydration operation again after finishing until the light dehydration by the rotational speed up to 500 rpm, it is determined in step S52 that there is a flag F1, and the processing of steps S53 to S56 is passed to directly step S57. Proceed to That is, the eccentric check of the fourth stage near the rotational speed of 500 rpm is also omitted. This is because the eccentric check of the fourth stage has no practical meaning because light dehydration is already performed once.

As described above, in the drum type washing machine of the present embodiment, when the laundry is dewatered, various occurrences of eccentric loads generated in the process of dewatering are taken into consideration. Thus, abnormal vibrations and abnormal noises can be avoided. It is possible to perform good dewatering by operating up to a high speed dewatering rotation as quickly as possible.

In addition, the said Example is an example of this invention, It is clear that change, correction, or addition can be suitably carried out in the range of the meaning of this invention.

According to the invention of the above-described configuration, it is possible to provide a drum type washing machine capable of rapidly dewatering while reliably preventing abnormal vibration of the drum, the outer cylinder, the outer housing, and the like during dehydration operation and accompanying abnormal noise.

Claims (15)

A drum type washing machine for dehydrating the laundry by rotating the drum containing the laundry at a high speed about a horizontal or inclined axis, a) The centrifugal force acting on the laundry in the drum is caused by the load of the laundry in the drum circumferential direction while the drum is being rotated at a first rotational speed which is a rotational speed at which the centrifugal force acting on the laundry is greater than gravity and lower than an idle rotational speed corresponding to the resonance point. Eccentric load detection means for detecting the size of the eccentric load, b) in the process of controlling to raise the rotational speed of the drum with a substantially constant acceleration within a range of the rotational speed higher than the first rotational speed and lower than the resonance rotational speed, based on the variation of the actual acceleration. Index value obtaining means for obtaining an index value reflecting the laundry distribution in the axial direction; c) a different threshold value is determined according to the magnitude of the eccentric load detected by the eccentric load detecting means, and when the indicator value exceeds the threshold, the possibility of abnormal vibration caused by the deflection of the laundry distribution in the drum axial direction. And a judging means for judging this high. A drum type washing machine for dehydrating the laundry by rotating the drum containing the laundry at a high speed about a horizontal or inclined axis, a) an inertia moment amount detecting means for detecting an amount of inertia moment during rotation of the drum reflecting the weight of the laundry in the water-containing state contained in the drum; b) a process in which the centrifugal force acting on the laundry in the drum is controlled to increase the drum's rotational speed with a substantially constant acceleration within a rotational speed in which the centrifugal force is greater than gravity and in a range lower than the resonance rotational speed corresponding to the resonance point. An index value acquiring means for obtaining an index value reflecting a distribution state of laundry in the drum axial direction based on a change in the actual acceleration; c) A different threshold value is determined according to the inertia moment amount detected by the inertia moment amount detecting means, and abnormal vibration is caused by the inclination of the distribution of laundry in the drum axial direction when the index value exceeds the threshold value. A drum type washing machine comprising determination means for determining that there is a high possibility. A drum type washing machine for dehydrating the laundry by rotating the drum containing the laundry at a high speed about a horizontal or inclined axis, a) an inertia moment amount detecting means for detecting an amount of inertia moment during rotation of the drum reflecting the weight of the laundry in the water-containing state contained in the drum; b) the centrifugal force acting on the laundry in the drum is caused by the washing of the laundry in the drum circumferential direction while the drum is being rotated at a rotational speed at which the centrifugal force acting on the laundry is greater than gravity and at a first rotational speed lower than the resonance rotational speed corresponding to the resonance point. Eccentric load detection means for detecting the magnitude of the eccentric load, c) in the process of controlling to raise the rotational speed of the drum with a substantially constant acceleration within a range of the rotational speed higher than the first rotational speed and lower than the resonance rotational speed, based on the variation of the actual acceleration. Index value obtaining means for obtaining an index value reflecting the distribution of laundry in the axial direction; d) A different threshold value is determined according to the magnitude of the moment of inertia detected by the moment of inertia detection means and the amount of eccentric load detected by the eccentric load detection means, and the drum axis when the index value exceeds the threshold. And a judging means for judging that the occurrence of abnormal vibration is high due to the inclination of the distribution of the laundry in the direction. The indicator value obtaining means obtains a repeating indicator value within a range of the rotational speed, and the determination means compares the indicator value with the threshold value. A drum type washing machine characterized in that it is determined that the occurrence of abnormal vibration is high due to the tendency of the distribution of the laundry in the axial direction when the case whose index value exceeds the threshold occurs one to several times. A drum type washing machine for dehydrating the laundry by rotating the drum containing the laundry at high speed about a horizontal or inclined axis, wherein the rotation speed of the motor is controlled by controlling the duty ratio of the motor driving the drum and the PWM drive signal. In the drum type washing machine having a motor driving means for controlling the, a) The duty ratio setting control is performed to sequentially change the duty ratio of the PWM drive signal until the centrifugal force acting on the laundry in the drum reaches a predetermined rotation speed exceeding the gravity from the drum stopped state. After reaching the predetermined rotational speed, the rotation control means for switching to the speed control at which the target speed is set; and b) an eccentric load detection means for detecting an eccentric load resulting from the deflection of the laundry, based on a change in the actual rotational speed of the drum after switching from duty ratio setting control to speed control. The eccentric load detecting means judges that the eccentric load is large when the actual drum rotation speed continues to fall below the target speed or a threshold speed different from the target speed for a predetermined time. Is a drum type washing machine, characterized in that for controlling the motor to stop the rotation of the drum to a speed close to or near it. A drum type washing machine for dehydrating the laundry by rotating the drum containing the laundry at a high speed about a horizontal or inclined axis, a) determining whether or not the magnitude of the eccentric load can be allowed while the drum is being rotated at a first rotational speed at which the centrifugal force acting on the laundry becomes greater than gravity and at a lower rotational speed corresponding to the resonance point. First eccentric load determining means, b) when the magnitude of the eccentric load can be permitted by the first eccentric load determining means, the drum is rotated at a second rotational speed at which the drum rotates at a second rotational speed that is higher than the resonance rotational speed and withdraws water from the laundry. Second eccentric load determination means for determining whether the magnitude of the eccentric load in the state can be allowed; c) When the dehydration operation is started for the first time after the start of the dehydration stroke, if it is determined by the second eccentric load determination means that the magnitude of the eccentric load cannot be tolerated, the rotation speed of the drum is lowered to loosen the laundry. If it is judged that the magnitude of the eccentric load can be tolerated, the control operation is shifted to the high-speed dehydration operation, and the second and subsequent dehydration operations are performed by the retry of the dehydration operation. And an operation control means for performing control to shift to a high speed dewatering operation by omitting the determination operation by the second eccentric load determination means when performing the operation. A drum type washing machine for dewatering laundry by rotating a drum containing laundry thereon at high speed about a horizontal or inclined axis, wherein the motor rotates the drum by controlling the duty ratio of the motor and the PWM drive signal. In the drum type washing machine having a motor driving means for controlling the speed, a) The duty ratio setting control is performed to sequentially change the duty ratio of the PWM drive signal until the centrifugal force acting on the laundry in the drum reaches the first rotational speed exceeding gravity until the drum is stopped and the rotational speed of the drum After the first rotational speed has been reached, the rotational control means for starting to switch to the speed control at which the target speed is set; b) first eccentric load determination means for judging whether or not the magnitude of the eccentric load due to the deflection of the laundry can be tolerated based on the actual variation in the rotational speed of the drum after switching from the duty ratio setting control to the speed control. and, c) second eccentric load determination means for judging whether the magnitude of the eccentric load in the state of rotating the drum at a second rotational speed higher than the first rotational speed and lower than the resonance rotational speed corresponding to the resonance point is acceptable; , d) when the magnitude of the eccentric load can be permitted by the second eccentric load determining means, the drum is rotated at a third rotational speed at which the drum rotates at a third rotational speed at which the water is released from the laundry while being higher than the resonance rotational speed; Third eccentric load determination means for determining whether the magnitude of the eccentric load in the state can be allowed; e) When performing dehydration operation for the first time after the start of the dehydration process, if it is determined by the third eccentric load determination means that the magnitude of the eccentric load is unacceptable, the rotational speed of the drum is lowered and then the laundry is released. If the dehydration operation is re-executed, and the third eccentric load determination means determines that the magnitude of the eccentric load can be allowed, control is performed to shift to the high speed dehydration operation, and the retry operation of the dehydration operation is performed. And a driving control means for performing control so as to omit the determination operation by the first eccentric load determination means when performing the dehydration operation operation after the second time. A drum type washing machine for dehydrating the laundry by rotating the drum containing the laundry at a high speed about a horizontal or inclined axis, a) balance adjusting means for generating a load on the drum to offset the eccentric load caused by the deflection of the laundry in the drum; b) Detecting the eccentric load due to the load of the laundry while the drum is being rotated at a rotational speed at which the centrifugal force acting on the laundry in the drum becomes greater than gravity and at a first rotational speed lower than the resonance rotational speed corresponding to the resonance point. Balance adjustment execution means for performing balance adjustment so that the eccentric load is reduced by the balance adjustment means when the eccentric load is large; c) in the drum axial direction on the basis of a change in the actual acceleration in the process of controlling to raise the rotational speed of the drum with a substantially constant acceleration within the range of the rotational speed higher than the first rotational speed and lower than the resonance rotational speed. By determining the index value reflecting the distribution state of the laundry in Esau and determining whether the index value exceeds a predetermined threshold value, it is determined whether or not the occurrence of abnormal vibration is high due to the inclination of the distribution of the laundry in the drum axial direction. First eccentric load determining means for determining; d) second eccentric load determination means for judging whether or not the magnitude of the eccentric load can be allowed while the drum is being rotated at a second rotational speed at which the water drains from the laundry after the balance adjustment is performed; , e) When the eccentric load is reduced by the execution of the balance adjustment, the rotational speed of the drum is raised from the first rotational speed, and the determination by the first eccentric load determination means is performed, whereby the possibility of occurrence of abnormal vibration is generated. If the rotational speed of the drum is increased to the second rotational speed when it is judged to be low, and the magnitude of the eccentric load cannot be accepted by the second eccentric load determination means, the rotational speed of the drum is lowered to loosen the laundry. And an operation control means for performing control to shift to a high speed dewatering operation if the magnitude of the eccentric load can be allowed to be re-executed after the dehydration operation is performed again. Opening and closing the outer housing, the outer tube formed inside the outer housing, a drum rotatably formed around a horizontal or inclined axis inside the outer cylinder, and an opening formed in the outer tube for putting laundry into and out of the drum In the drum type washing machine having an outer cylinder lid formed in the outer cylinder to, In order to support the outer cylinder, two dampers having a lower end portion and an upper end portion fixed to the outer cylinder side are formed on the side of the supporting portion formed at the lower portion of the outer housing, and the two dampers are disposed between the shaft of the drum when viewed from above. A drum type washing machine, which is located on both sides and is formed so as to be in a positional relationship substantially perpendicular to its axis. A drive source for driving the shaft is attached to an outer surface of an outer cylinder which is located outside of one end face of the drum, and the two dampers are arranged in a direction of the drive source rather than a position corresponding to a center in the drum axial direction. Drum-type washing machine, characterized in that formed off the installation position. 12. The drum type washing machine according to claim 11, further comprising a spring for pulling the upper portion of the outer cylinder upwardly opposite to the installation position side of the drive source in the outer cylinder. 13. The drum type washing machine according to claim 12, further comprising a plurality of weak springs connecting the upper side of the outer cylinder and the outer housing to maintain the posture of the outer cylinder. In a drum type washing machine having an outer housing, an outer cylinder rotatably provided therein, and a plurality of dampers supporting the outer cylinder by having a lower end fixed to a supporting portion formed at a lower portion of the outer housing, The damper is fixed to the upper and lower ends of the damping plate by a vibration absorbing elastic member fitted with a metal mounting plate respectively fixed to the outer cylinder and the outer housing, and at least between the elastic member and the mounting plate toward the central portion, Drum-type washing machine characterized in that the sandwiching between the protective sheet member for preventing the edge of the attachment plate to the elastic member. In a drum type washing machine having an outer housing, an outer cylinder rotatably provided therein, and a plurality of dampers supporting the outer cylinder by having a lower end fixed to a supporting portion formed at a lower portion of the outer housing, The upper end and the lower end of the damper each have two vibration absorbing elastic members in a compressed state between a metal attachment plate fixed to an outer cylinder or an outer housing and two washers applied to the damper above and below the attachment plate. The size of the washer and the elastic member is fixed to the mounting plate, and the size of the washer and the elastic member is fixed with a dimensional margin such that the elastic member is not pushed out than the circumferential edge of the washer even when the elastic member is compressively deformed during the operation of the washing machine. Drum type washing machine.