KR20090094298A - Drum type washing machine - Google Patents

Abstract

A rotary drum formed in a bottomed cylindrical shape is so disposed in a water tank that its rotation axis is extended horizontally or inclined downward from the horizontal from the opened front side toward the bottomed rear side thereof. A control part performs, after a dehydration step, forward/reverse circular arc rotation drive mode in which the rotary drum alternately repeats quick forward circular arc rotation and quick reverse circular arc rotation between a 0-degree position that is the lowest position of the rotary drum and a position beyond a 90-degree position but less than 180-degrees.

Description

Drum-type washing machine {DRUM TYPE WASHING MACHINE}

The present invention relates to a drum type washing machine for washing laundry in a rotating drum by rotating the rotating drum provided in the water tank so that the rotating shaft direction is inclined downward from the horizontal or horizontal direction.

9 is a sectional view showing the structure of a conventional drum type washing machine. This washing machine has a housing 31, a water tank 32, a rotating drum 34, a motor 35, and a door 36. The water tank 32 is supported by the suspension structure in the housing 31. The rotary drum 34 in which the plurality of holes 33 are formed is disposed in the water tank 32. The motor 35 drives the rotation drum 34 to rotate. The door 36 is provided on the front side of the housing 31. By opening the door 36, the user can take in and out the laundry from the inside of the rotating drum 34 through the front opening of the water tank 32 and the front opening of the rotating drum 34. FIG.

In the normal washing mode, the user opens the door 36, puts laundry and detergent into the rotary drum 34, and starts operation. Then, water is supplied from the water supply part 37 to the water tank 32. Of the water supplied, the required amount of water is also supplied into the rotating drum 34 through the hole 33. When the rotary drum 34 is driven to rotate at a rotational speed of, for example, 50 rpm by the motor 35, the laundry contained in the rotary drum 34 is caught by the stirring projection 38 provided on the inner circumferential surface of the rotary drum 34. It is lifted in the direction of rotation. And the laundry falls from the proper height. In this way, the laundry is washed by adding a tapping action. After this washing step, the dirty washing water is discharged by the drain portion 41, and a rinsing step is performed using the water newly supplied from the water supply portion 37. When the rinsing step is completed, the rotary drum 34 is rotated at high speed, for example, about 1000 rpm, so that the dehydration step is performed. These steps are automatically executed based on the predetermined control sequence.

By the way, by the continuous rotation of the washing | cleaning step or the rinsing step, and the continuous rotation at the high speed of the rotating drum 34 in a dehydration step, as shown to FIG. 10A, the laundry 61 is entangled or stuck. As a countermeasure against this, Patent Document 1 discloses the following method using the degree of freedom of rotation control in the direct drive by the motor 35 of the rotary drum 34. That is, after the dehydration step, the rotary drum 34 is rotated back and forth a plurality of times within a minute rotation angle of 90 degrees or less, especially at a minute rotation angle of 10 degrees or more and less than 30 degrees. By this rotation control, as shown in FIG. 10B, the laundry 61 stuck in the rotating drum 34 is removed. Alternatively, the laundry 61 in the state of being aggregated at the upper portion of the rotary drum 34 is released. As a result, the unbalance at the time of dehydration is reduced, and the laundry 61 after drying becomes easy to take out.

In the technique described in Patent Literature 1, the small-angle rotation of the normal and reverse alternation performed after the dehydration step is performed at a speed of about 55 rpm that can sufficiently adhere the laundry 61 to the inner surface of the rotating drum 34. In addition, within the micro-rotation angle of 90 degrees or less, only the forward and reverse rotation is performed multiple times at the micro-rotation angle of 10 degrees or more and less than 30 degrees. Therefore, it is not substantially constant velocity from the start to the end of the microangular rotation. That is, only the area below the micro angle in the middle becomes the predetermined speed, and before and after that, the speed increases toward the predetermined speed or deceleration from the predetermined speed. Therefore, the laundry 61 can only be lifted to the position below the micro angle.

As a result, even if an inertial force acts on the laundry 61 by rapid deceleration, such as braking at the end of micro-angle rotation, this force acts in the direction against gravity. Therefore, the laundry 61 tends to slip down rather than to fall off in the direction away from the inner surface of the rotating drum 34. Therefore, the laundry 61 which slips off is moved in the slipping direction by the small angle rotation of the next reverse direction of the rotating drum 34. This movement is then repeated. Therefore, the laundry 61 oscillates from side to side by slipping on the end side in the forward and reverse repetition of the micro-angle rotation of the rotary drum 34, and the positions of the laundry 61 are not so interchanged. As a result, the laundry 61 collects in the lower part of the rotary drum 34, and exhibits the rolling behavior slightly as a whole of the mass of the laundry 61 by friction at the time of sliding with the inner surface of the rotary drum 34. FIG.

Therefore, even if the laundry 61 adheres to the inner surface of the rotary drum 34, the effect of untangling or twisting is not sufficient. In particular, the laundry 61 strongly pressed onto the inner surface of the rotary drum 34 by entanglement, twisting, and folds in the washing step and the rinsing step is strongly attached to the rotating drum 34 to be marked. As a result, the effects of tangling and twisting are not enough. In this way, the laundry 61 which is not sufficiently entangled or twisted is difficult to take out, and it is cumbersome because it requires post-treatment to unwrap or straighten to dry. In particular, torn laundry 61 remains wrinkled or wrinkles after drying, which is troublesome to spread it.

[Patent Document 1] Japanese Unexamined Patent Publication No. 2000-254385

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows the structure of the drum type washing machine by embodiment of this invention.

FIG. 2 is a rear view of the drum washing machine shown in FIG. 1.

3 is a cross-sectional view showing almost half of the motor attachment portion of the drum type washing machine shown in FIG. 1.

It is a schematic diagram which shows the position of the laundry in the rotating drum at the time of the stop of the drum type washing machine shown in FIG.

It is a schematic diagram which shows the state which started the rotation of the rotating drum from the state of FIG. 4A.

It is a schematic diagram which shows the state which decelerated rotation of the rotating drum from the state of FIG. 4B.

4D is a schematic diagram showing a state in which the rotation of the rotating drum is accelerated in the reverse direction from the state of FIG. 4C.

It is a schematic diagram which shows the state which decelerated rotation of the rotating drum from the state of FIG. 4D.

4F is a schematic diagram showing a state in which the rotation of the rotating drum is accelerated from the state of FIG. 4E in the forward direction.

It is a schematic diagram which shows the left-right rotation of the lifting position and falling position of the laundry in the forward-backward rotation drive mode shown to FIG. 4F from FIG. 4C.

FIG. 5 is a rotation characteristic diagram for attaching and detaching laundry to an inner surface of a rotating drum for ideally realizing the forward and reverse rotation drive mode in the drum type washing machine shown in FIG. 1. FIG.

FIG. 6 is a graph showing an example of a combination pattern of the forward / reverse continuous rotation drive mode and the forward / reverse rotation drive mode in the drum type washing machine of FIG. 1.

FIG. 7 is a graph showing another example of a combination pattern of the forward / reverse continuous rotation drive mode and the forward / reverse rotation drive mode in the drum type washing machine of FIG. 1.

FIG. 8A is a schematic diagram showing an example of a laundry state after the forward / reverse rotation drive mode in the drum type washing machine shown in FIG. 1 is performed after the dehydration step.

8B is a schematic diagram showing another example of the state of laundry after the dewatering step of the forward / reverse rotation drive mode in the drum type washing machine shown in FIG. 1.

9 is a sectional view showing the configuration of a main part of a conventional drum type washing machine.

10A is a schematic diagram showing an example of a laundry state after a dehydration step in a conventional drum type washing machine.

10B is a schematic diagram showing another example of the state of laundry after a dehydration step in a conventional drum type washing machine.

<Code description>

1 housing 2 tank

3: hole 4: rotating drum

4A: shaft 5: motor

5A: Stator 51: Inner Rotor

52: outer rotor 6: the door

7: water supply part 8: stirring projection

9: control unit 10: bearing

11: drain 12: blower

13: ventilation path 14: operation unit

15 filter 16: dehumidifier

17: heating part 18: compressor

19: air conditioner 20: laundry

This invention is a drum type washing machine which fully loosens the tangles and torsions which generate | occur | produces the laundry strongly after a dehydration step, reduces wrinkles, and raises the finishing state of laundry.

The drum type washing machine according to the present invention has a water tank, a rotating drum, a motor, and a control unit. The rotating drum for accommodating laundry therein is formed in a cylindrical shape with a bottom. And it is provided in the water tank so that the rotation axis direction may incline downward from a horizontal or horizontal direction toward the back side which becomes a bottom part from the opening front side. The motor drives the rotating drum to rotate. The controller controls at least the motor to execute at least the washing step, the rinsing step, and the dehydration step. The control unit also rapidly rotates the rotating drum by suddenly driving the motor, and attaches the laundry to the inner surface of the rotating drum by centrifugal force caused by the rapid rotation of the rotating drum. Raise the laundry to a position above 180 degrees and below 180 degrees. In addition, by rapidly braking the rotation of the motor, the control unit separates the laundry from the inner surface of the rotating drum and drops the laundry to the side opposite to the side on which the laundry is being lifted. The control unit executes the forward / reverse rotation drive mode in which the series of operations are repeatedly performed in the forward / backward alternation after the dehydration step.

By executing this forward / reverse rotation drive mode, laundry can be lifted by more than 90 degrees from the lowest position of the rotating drum to less than 180 degrees by the rapid rotation of the rotating drum. And a braking state is generated by rapid braking at the final stage of lifting the laundry. This braking state makes it possible to reliably remove the laundry from the inner surface of the rotating drum by its inertia and its own weight and to drop the laundry to the side opposite to the lifting side of the lower range of the rotating drum. In addition, since the lifting position and the dropping position of the laundry can be replaced by the left and right alternate rotation in each rotation rotation drive, the loosening operation can be enhanced while preventing the laundry from becoming tangled. In addition, the number of times that the mechanical force is applied to the laundry can be increased. The laundry tends to be strongly pressed and adhered to the inner surface of the rotating drum in the form of entanglement, twisting, and pleat at the end of the washing step and the rinsing step. However, by performing the above-mentioned forward and reverse rotational driving mode after the dehydration step, the laundry can be unwound and the mechanical force can act on the laundry to smooth out the wrinkles.

EMBODIMENT OF THE INVENTION Hereinafter, the drum type washing machine by embodiment of this invention is demonstrated, referring drawings. In addition, the following description is a specific example of this invention, and does not limit this invention.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows the structure of the drum type washing machine by embodiment of this invention. FIG. 2 is a rear view of the drum washing machine shown in FIG. 1. 3 is a cross-sectional view showing almost half of the motor attachment portion of the drum type washing machine shown in FIG. 1.

This washing machine has a housing 1, a water tank 2, a rotating drum 4, a motor 5, and a door 6. The water tank 2 is supported in the housing 1 by the suspension structure. A bottomed cylindrical rotating drum 4 with a plurality of holes 3 is arranged in the water tank 2. The motor 5 drives the rotary drum 4 to rotate. The door 6 is provided at the front side of the housing 1. By opening the door 6, the user can take in and out the laundry from the inside of the rotating drum 4 through the front opening of the water tank 2, and the front opening of the rotating drum 4. As shown in FIG.

The user sets the mode from the operation unit 14. According to this setting, various modes are executed by the control unit 9 equipped with a microcomputer holding a control program.

In the normal washing mode, the user opens the door 6, puts laundry and detergent into the rotary drum 4, and starts operation. Then, the control part 9 supplies water in the water tank 2 by the water supply part 7. Of the water supplied, the required amount of water is also supplied into the rotating drum 4 through the hole 3.

Next, the control unit 9 drives the rotary drum 4 to rotate at a predetermined rotational speed by the motor 5. Then, the laundry accommodated in the rotating drum 4 is caught by the stirring projection 8 provided on the inner circumferential surface of the rotating drum 4 and lifted in the rotational direction. And the laundry falls from the proper height. In this manner, the laundry is washed by adding a tapping action.

After this washing step, the control unit 9 discharges the laundry soiled by the drainage part 11, and further performs a rinsing step by freshly watering the water by the water supply part 7. Moreover, the water supply part 7 can supply water at a suitable time as shown by the solid arrow by opening and closing the solenoid valve of omission of illustration, and when the detergent of a detergent accommodating part of an illustration of omission is suitable in the water tank 2 using water supply. Input. The drain 11 is drained as indicated by a dashed-dotted arrow when necessary, such as at the end of the washing step or at the end of the rinsing step, by opening and closing the solenoid valve (not shown).

When the rinsing step is finished, the control unit 9 rotates the rotary drum 4 at high speed to perform the dehydration step. The control unit 9 automatically executes these steps based on a predetermined control sequence. In this way, the control unit 9 controls at least the motor 5 to execute at least the washing step, the rinsing step, and the dehydration step.

The control unit 9 also sucks air in the water tank 2 and the rotary drum 4 by the blower 12. The dehumidifying unit 16 dehumidifies the sucked air. The heating unit 17 heats the dehumidified air. The ventilation path 13 connects the blower 12, the water tank 2, the heating part 17, and the water tank 2, respectively. The control part 9 blows dry hot air in the water tank 2 and the rotating drum 4 by the drying part formed in this way. In such a drum type washing machine called a drum type laundry dryer, the drying step is automatically executed after the dehydration step.

The blower 12 circulates air in the water tank 2 and the rotating drum 4 as shown by the broken-line arrow shown in FIG. 1, 2 in the ventilation path 13 which comprises a drying part. The ventilation path 13 is provided with the filter 15 which collects and damps the silkworms etc. in the introduction air from the water tank 2 and the rotating drum 4, and is damped. Therefore, the dehumidification part 16 dehumidifies the introduced air after damping. The blower 12 is arrange | positioned downstream of the heating part 17 so that it may be hard to be influenced by moisture.

In FIG. 1 and FIG. 2, the dehumidifying unit 16 and the heating unit 17 are each composed of an evaporator and a condenser in which a refrigerant is circulated by the compressor 18 and performs heat exchange with circulating air. Namely, these constitute the air conditioner 19. However, the dehumidification part 16 and the heating part 17 are not limited to this, A different structure may be sufficient.

The rotating drum 4 is arrange | positioned so that the direction of the rotating shaft 4A of the rotating drum 4 may incline downward from the horizontal or horizontal direction toward the bottom part side from the opening side. In the example of FIG. 1, as for the rotating drum 4, the motor 5 on the water tank 2 is directly connected to the rotation shaft 4A, and with the water tank 2, the direction of the rotation shaft 4A toward the bottom side from the opening side. The angle θ is provided at an angle of 20 ± 10 degrees from the horizontal direction.

When washing is performed by the rotating drum 4 arrange | positioned in this way, even if the rotating drum 4 is provided in the same height as the case where the rotating shaft 4A is installed in a horizontal direction, an opening becomes obliquely upward. Therefore, the user can easily take in and out the laundry without taking an excessively bent posture. In particular, by setting the inclination angle θ to 20 ± 10 degrees, even if there is a difference in height from a child to an adult or a wheelchair user, the laundry is easily put in and out of the laundry. Moreover, there is also an advantage that the deep water storage state is obtained even with a small amount of water collected in the back side of the water supplied in the rotary drum 4.

The dewatering step is carried out in continuous rotation at high speed, for example 1000 rpm. Therefore, the laundry is stuck to the inner surface of the rotary drum 4 in the state of being entangled, twisted, and corrugated in the washing step and the rinsing step. As a result, it is difficult for a user to take out laundry. In addition, it is easy to leave severe marks on laundry, and it takes a lot of effort to smooth out wrinkles.

With respect to such a problem, in the present embodiment, the forward and backward rotation drive mode executed after the dehydration step is set as the control in which the control unit 9 drives the rotary drum 4 by the motor 5. Here, "pivot" means a rotational motion of less than one rotation. Specifically, in the "rotation drive mode", when the lower end in the vertical direction is set to the 0 degree position, the rotary drum 4 rapidly rotates to a position which is less than 200 degrees beyond the 90 degree position, and is rapidly braked. . That is, the control unit 9 rapidly drives the motor 5 at a rate of change such that the laundry adheres to the inner surface of the rotary drum 4 by centrifugal force, thereby rapidly rotating the rotary drum 4. And the laundry is lifted from the 0 degree position which is the lowest position of the rotating drum 4 to the position below 180 degree exceeding 90 degree position. Then, the control unit 9 brakes rotation of the motor 5 at a rate of change such that the laundry is detached from the inner surface of the rotating drum 4, and falls to the side opposite to the side on which the laundry is being lifted of the rotating drum 4. Let's do it. This operation is performed in reverse and alternating current.

Next, the motion of the laundry 20 in the forward / backward rotational drive mode will be described with reference to FIGS. 4A to 4G. 4A-4G is a schematic diagram for demonstrating the motion of the laundry 20, and do not limit the content of this invention.

First, as shown in FIG. 4A, when the drum type washing machine is stopped, the laundry 20 in the rotary drum 4 is located at the lower side, that is, near the 0 degree position. As shown in FIG. 4B, the rotary drum 4 is rapidly rotated (quick rotation drive) at a speed of 50 rpm or more to the vicinity of the 85 degree position in the electrostatic direction, and the laundry 20 is rotated. Is attached to the inner surface of the rotating drum 4 and lifted up. The laundry 20 is lifted from the dashed position to the solid line position from the 0 degree position to the position of less than 180 degrees exceeding the 90 degree position.

As shown in FIG. 4C, the rotary drum 4 is suddenly braked and rapidly decelerated to a position of less than 200 degrees, for example, a position of 165 degrees, exceeding the 90 degree position in the electrostatic direction. The laundry 20 is separated from the inner surface of the rotary drum 4 by its inertia and its own weight when the rotational speed of the rotary drum 4 becomes 50 rpm or less, that is, in the vicinity of the 135 degree position in the electrostatic direction, and the laundry 20 falls toward the opposite side to the lifting side. Thereafter, the rotary drum 4 rotates to the vicinity of the position of 165 degrees in the electrostatic direction by inertia, whereby the laundry 20 rotates to the vicinity of the position of 15 degrees in the electrostatic direction.

Next, as shown to FIG. 4D, the rotating drum 4 accelerates to 85 degree vicinity of a reverse direction, ie, 100 degree and 50 rpm or more in a reverse direction. By this rotation, the laundry 20 is attached to the inner surface of the rotary drum 4 and lifted up. Thereafter, as shown in FIG. 4E, the rotary drum 4 suddenly brakes and rapidly decelerates to a position of 165 degrees in the reverse direction. The laundry 20 is lifted from the inner surface of the rotary drum 4 by its inertia and its own weight when the rotational speed of the rotary drum 4 becomes 50 rpm or less, that is, in the vicinity of the 135 degree position in the reverse direction. And fall toward the opposite side. Thereafter, the rotary drum 4 rotates to the vicinity of the position of 165 degrees in the reverse direction by inertia, and the laundry 20 rotates to the vicinity of the position of 15 degrees in the reverse direction.

As shown in FIG. 4F, the rotary drum 4 is rapidly accelerated to the vicinity of the 85 degree position in the electrostatic direction, that is, 100 degrees in the electrostatic direction and 50 rpm or more. By this rotation, the laundry 20 is attached to the inner surface of the rotary drum 4 and lifted up. Thereafter, as shown in FIG. 4C, the rotary drum 4 suddenly brakes and rapidly decelerates to a position of 165 degrees in the electrostatic direction. Thereafter, the operation described with reference to Figs. 4C to 4E is repeated.

By the rapid rotation drive of the normal and reverse alternation, the lifting position and the dropping position of the laundry 20 are replaced with the left and right alternates as shown in FIG. 4G in every arc rotation drive. Therefore, the loosening effect of the laundry 20 becomes high. As a result, it is possible to prevent the laundry 20 from being entangled, twisted, and stuck to the inner surface of the rotary drum 4, thereby making it easier to take out the laundry 20, and greatly causing wrinkles in the laundry 20. I can alleviate it. In addition, the mechanical force can be uniformly applied to the laundry 20, and the number of drops of the laundry 20 having a tapping effect is greatly increased, so that the function at each step of the washing machine including the effect of smoothing wrinkles can be improved. Therefore, post-processing becomes easy, and the trouble of unfolding wrinkles can be greatly reduced by obtaining a high finishing state. In consideration of these effects, the forward / reverse rotation driving mode may be applied to the washing step, the rinsing step, or the drying step.

The rapid forward rotation and the rapid reverse rotation of the rotary drum 4 are performed by driving the laundry 20 at an acceleration that adheres to the inner surface of the rotary drum 4 up to 90 degrees forward and backward. Therefore, even the light laundry 20 after dehydration is stuck to the inner surface of the rotating drum 4 to 90 degrees vicinity which becomes easy to fall by the weight of the laundry 20. FIG. And by the rapid acceleration, the laundry 20 is lifted without slipping to the pivoting position, and is given up to the rotational speed of the rotary drum 4 to be surely lifted up to the pivoting end position. Finally, the laundry 20 is forcibly removed by the high inertia and the weight of the rapid acceleration in a predetermined direction at the time of change to the braking state.

Moreover, the forward / reverse switching of the rotational direction of the rotating drum 4 is performed between abrupt braking operations at the position where the rotating rotation of the rotating drum 4 exceeds 90 degrees and is less than 200 degrees. Thereby, even in the condition which satisfies the acceleration which guarantees the sticking of the laundry 20, the laundry 20 is reliably removed at the final stage of the arc rotation. Moreover, the temporal loss of mechanical force provision with respect to the laundry 20 can be suppressed. Therefore, while the effect of each step of a washing machine is acquired in a shorter time, entanglement and twisting can be prevented and wrinkles can be alleviated.

In view of the behavior of the laundry 20 described above, in the pivoting drive mode of the present embodiment, the control unit 9 rotates the laundry 20 by the centrifugal force by the rapid rotation of the rotary drum 4. ) To the inner surface and lift upwards. Thereafter, by the rapid braking of the rotary drum 4, the lifted laundry 20 is removed from the inner surface of the rotary drum 4 by its inertia and its own weight and dropped. And the forward / reverse rotation drive mode of this embodiment can be grasped | ascertained as the mode which repeats the drive by this rotational drive mode by forward and reverse alternation.

In a more preferred forward and reverse rotational drive mode, the control unit 9 causes the laundry 20 to adhere to the inner surface of the rotary drum 4 by centrifugal force due to the rapid rotation of the rotary drum 4 so that the upper portion of the rotary drum 4 is rotated. Raise to the range. Thereafter, by the rapid braking of the rotary drum 4, the laundry 20 is detached from the inner surface of the rotary drum 4 by its inertia and its own weight and lifted by the inertia and its own weight in the lower range of the rotary drum 4. Drop to the side opposite to the raising side. This drive control is repeated in forward and reverse alternation. The control unit 9 executes this forward / reverse rotation drive mode after the dehydration step. In particular, after the dehydration step, the laundry 20 is lightened by the dehydration, so that it adheres to the rotating drum 4. Therefore, in order to lift the laundry 20, it is preferable to secure the rotational speed of the rotating drum 4 to the extent that the laundry 20 can be stuck to the inner surface of the rotating drum 4. To this end, it is suitable to increase the rotational speed of the rotary drum 4 in some cases than in the washing step or the rinsing step.

Also in this case, it is preferable to repeat the forward rotation and the reverse rotation of the rotary drum 4 at a position of less than 200 degrees for the reasons described above, and it is best to perform the position beyond the 90 degree position.

Here, the gravity of the laundry 20 in the rotary drum 4 having a diameter of 500 ± 50 mm is decomposed in a tangential direction with the central direction of the rotary drum 4, whereby the drum rotational speed at which the force in the center direction and the centrifugal force is balanced is obtained. , It is calculated using the equation (1).

mrω ² = mg cos θ... (One)

m: mass of laundry, r: radius of rotation, ω: angular velocity, g: gravitational acceleration, θ: angle of rotation direction with vertical direction being 0 degrees

The calculation result is shown in FIG. In FIG. 5, the square plot has shown the drum rotational speed required in order to balance the force of a center direction and centrifugal force in each angular position. Moreover, the solid line arrow has shown the rotational speed of the rotating drum 4 in each angular position.

As shown by the broken line, the rotating drum 4 rotates rapidly from the time 21 which shows the stop time corresponded to the state of FIG. 4A, and reaches the rotation speed about 60 rpm at the time 22 corresponded to the state of FIG. 4B. Since the solid line arrow exceeds the plot at the time point 22, the laundry 20 adheres securely to the inner surface of the rotating drum 4. In this way, when the rotation angle of the rotary drum 4 is 90 degrees, the laundry 20 is securely attached to the rotary drum 4, so the laundry 20 is lifted beyond the 90 degrees position. That is, the required rotational angle of the rotating drum 4 is 85 degrees, which is slightly less than 90 degrees, and satisfies the conditions described above. In addition, in the above description, the lifting by the attachment of the laundry 20 is set to a position of less than 180 degrees exceeding the 90 degrees position of the rotary drum 4, but in this example, the position of 135 degrees indicated at the time point 26 is shown. I am doing it.

Since the plot and the solid arrow cross at this 135 degree position and the solid arrow is lower than the plot, the laundry 20 is detached from the rotating drum 4 under this condition. Therefore, at the viewpoint 26 near the 135 degree position, the control part 9 makes the rotating drum 20 apply braking which stops in the vicinity of the 165 degree position shown at the viewpoint 23. This braking removes the laundry 20 from the inner surface of the rotary drum 4 due to the rotational inertia and self-weight acting on the laundry 20. It can be seen from the above that the laundry 20 is separated from the rotating drum 4 by the maximum rotational speed of 50 rpm and a slight deceleration state.

From these calculations and experiences, it is preferable that the maximum rotation speed of the arc rotation in the forward / reverse rotation drive mode is 50 rpm or more. By such a rotational speed, even the light laundry 20 after dehydration to near the 90 degree | times position which becomes easy to fall by self weight can be made to adhere to the inner surface of the rotating drum 4, and can lift it. Moreover, braking for removing the laundry 20 is performed at the maximum rotational speed, so that the effect of the forward and reverse rotation drive mode is obtained. In addition, the laundry 20 can be removed in the forward / backward rotational driving mode by braking in the range of 85 ° to 165 °, for example, as shown in FIG. 5. Specifically, for example, when decelerating from an arc of rotation at the maximum rotational speed of 50 rpm, the force of force release according to the deceleration is reduced by the rotational inertia and the own weight of the laundry 20 which is to continue the rotation at this rotational speed. 20) to fall.

As shown in Fig. 5, the first arc rotation from Fig. 4A to Fig. 4C is preferably performed between the positions of the 0 degree position and the vicinity of 165 degrees. And it is preferable to perform arc rotation after repeating FIG. 4C-FIG. 4F in the range of the position near -15 degree position from the position near 165 degree position. Thereby, the laundry 20 stopped in the lower range of the rotating drum 4 at the time of the first arc rotation is shown in the position below 180 degrees, specifically 165 degrees, exceeding the 90 degree position. The arc turns to near, lifting up to near the 135 degree position. And between a 135 degree position and a 165 degree position. Thereby, the laundry 20 falls on the opposite side to the left and right of the rotating drum 4, specifically, about the diameter line of the rotating drum 4, or below it. In subsequent arc rotation, the rotary drum 4 is driven in a 180 degree range between the vicinity of the 165 degree position and the vicinity of the -15 degree position.

As a result, the laundry 20 moves inclined to the left and right sides of the rotary drum 4. Specifically, the laundry 20 which is inclined almost 30 degrees from the lower end of the rotary drum 4 is lifted to the upper part of the same side of the rotary drum 4, specifically, to approximately 135 degrees, so that the left and right sides of the rotary drum 4 It falls to almost 30 degrees position on the opposite side. This behavior is reliably achieved by obtaining a maximum fall distance that is substantially symmetrical and is equivalent to the diameter of the rotating drum 4. This increases the effect of loosening and tapping on the laundry 20.

In addition, when the maximum rotational speed of the rotation in the forward and reverse rotation drive mode is less than 50rpm, the laundry 20 is the rotary drum 4 as the rotational inertia acting on the laundry 20 by braking the rotary drum 4. It does not come off from the inner surface of. In other words, the reversal attempt laundry 20 of the rotary drum 4 rotates together with the rotary drum 4 while being attached to the inner surface of the rotary drum 4. Therefore, the loosening effect is not exerted.

In addition, when the rotation angle of the rotating drum 4 is 90 degrees or less, the laundry 20 cannot be lifted, and when the rotation angle of the rotating drum 4 is 200 degrees or more, At the time of reversal, the laundry 20 turns over the position (top) of 180 degrees. Therefore, the laundry 20 as shown in FIG. 4G does not perform the operation of replacing left and right alternately.

However, in order to realize the forward and reverse rotation drive mode of the rotary drum 4 as described above, the driving load applied to the motor 5 is very large. Therefore, it becomes the cause of enlargement, such as increasing the number of poles of the motor 5. However, in this embodiment, as shown in FIG. 1, FIG. 3, the inner rotor 51 is arrange | positioned at the inner peripheral side of the stator 5A fixed to the outer surface of the bottom part of the water tank 2, and the outer rotor 52 is arrange | positioned at the outer peripheral side. It is. The inner rotor 51 and the outer rotor 52 are directly connected to the rotation shaft 4A. In this way, the inner rotor 51 and the outer rotor 52 interact with each other from the inner and outer circumferences with respect to the stator 5A. For this reason, the drive power can be doubled without making the motor 5 large, and the small motor 5 can execute the forward / reverse rotation drive mode accompanying the rapid reverse without difficulty.

Thereby, the forward / backward rotational drive mode involving the rapid reverse with the right and left balanced rotation characteristics as shown in FIG. 5 can be carried out permanently. That is, in any of the forward rotation and the reverse rotation of the rotary drum 4, the laundry 20 can be dropped at almost the same position at the nearly 30 degree position opposite to the rotation direction. In addition, after the inertia rotation of 15 degrees from the time of the fall, the laundry 20 is rotated by rapid braking at approximately the same rotation angle of 30 degrees after reaching the attaching region of the laundry 20 by the reverse rotation to the almost same 85 degrees position. It is removed from the drum 4. Moreover, the time required from the peeling position shown at the time point 24 to the peeling position shown at the time point 26 is about 0.8 second, and the time required from the dropping position shown at the time point 25 to the dropping position shown at the time point 23 is about 0.8 second, Both are the same.

In this embodiment, it is preferable to implement a forward / backward rotation drive mode between the forward / backward continuous rotation drive mode and the forward / backward switching in the forward / backward continuous rotation drive mode. In the forward and reverse continuous rotation drive mode, the control unit 9 rotates the rotary drum 4 continuously, and repeatedly switches the rotation direction by forward and reverse alternating. The rotation speed at that time is set so that the laundry 20 lifted by the rotation of the rotating drum 4 may show the behavior that its own weight falls from the height which overcomes centrifugal force.

In general, at the end of the dehydration step, the laundry 20 is strongly pressed against the inner surface of the rotary drum 4 over its entire circumference. When the forward and reverse rotation drive mode is executed in this state, the attached laundry 20 located on the upper portion of the rotary drum 4 is released from the inner surface of the rotary drum 4 and released. On the other hand, the laundry 20 attached to the lower part of the rotary drum 4 only rotates the rotary drum 4 at a position of less than 200 degrees beyond the 90 degree position, and thus the inner surface of the rotary drum 4. It does not come off from and remains attached. Thus, by executing the forward and reverse continuous rotation drive mode between the forward and reverse rotation drive modes, the part of the laundry 20 which has been separated runs around the rotating drum 4. Thereby, the laundry 20 which was in the stuck state can be removed.

Moreover, the position of the circumferential direction of the rotating drum 4 changes with the forward and reverse continuous rotation drive mode. Thereby, the laundry 20 adhering to the lower part of the rotating drum 4 may be located in the upper part of the rotating drum 4. And the laundry 20 stuck to the inner surface of the rotating drum 4 can be removed reliably by execution of the next normal reverse rotation drive mode. As a result, the laundry 20, which has been strongly pressed and adhered to the inner surface of the rotary drum 4 over almost the entire circumference, can be evenly detached and loosened.

As a result, as shown to FIG. 8A and FIG. 8B, each laundry 20 spreads out smoothly, wrinkles are also reduced very much, and the finishing state is favorable. In addition, in the case of subsequently executing the drying step, the air permeability of the laundry 20 is also improved, and the drying can be evenly performed in a short time. In addition, in the drying step, when the combination of the forward and backward rotation drive mode and the forward and reverse continuous drive mode is performed, the wrinkles are spread by the tapping action, and the laundry 20 is in a finished state with less wrinkles. As a result, the laundry 20 becomes softer, and even if it is a thin cloth dough product, it becomes a high finishing state with very few wrinkles compared with the former. In pile products, piles are not laid and are in a line state, and nonwoven fabrics are not stiff.

In addition, excessive power-up of the motor 5 is uneconomical. Therefore, in the drive of the motor 5 by the 1st motor drive instruction which drives the rotating drum 4, when the out-of-fuel limit of the motor 5 is exceeded, the control part 9 will make a motor (2) by the 2nd motor drive instruction | command. It is preferable to control the rotation of 5). In this second motor drive instruction, the rotation speed is set so as not to exceed the upper limit load of the motor 5. By this control, even if there is a difference in the driving load every time, the rotational characteristics of the rotary drum 4 which can obtain the lifting and unloading behavior with respect to the laundry 20 as set are assured. At the same time, the upper limit of the power-up is suppressed. To do this, for example, the rotation speed of the rotary drum 4 may be monitored and feedback controlled.

Moreover, it is preferable to change the drive of the rotating drum 4 according to the elapsed time or the quantity of the laundry 20. As a result, the rotary drum 4 is driven in a state most suitable for the laundry 20 in response to a change in conditions due to the progress of dehydration or a difference in the driving load according to the amount of the laundry 20. For example, in the initial stage, the ratio of the normal and reverse continuous rotation drive mode is increased, and all the laundry 20 stuck over almost the entire circumference of the inner surface of the rotating drum 4 is reliably removed. After that, when the predetermined time has elapsed, the laundry 20 can be entangled or twisted by increasing the forward / reverse rotation driving mode. In addition, the rotary drum 4 which is optimal for the laundry 20 can be driven in response to the difference in the driving load according to the amount of the laundry 20. What is necessary is just to employ | adopt the various detection methods which are known as the quantity of the laundry 20, and the moisture content.

In addition, as described above, the driving load is high in the forward and reverse rotational driving mode. Moreover, the rotating drum 4 repeats forward rotation and reverse rotation within a predetermined range. Therefore, the position in the circumferential direction of the rotating shaft 4A and the bearing 10 shown in FIG. 3 hardly changes, and there exists a tendency to apply a load to the part located always below the same. For this reason, one-sided wear may occur between the rotating shaft 4A and the bearing 10, or the rattling may occur early.

On the other hand, the drive load in the forward and reverse continuous rotation drive mode is smaller than the drive load in the forward and reverse rotation drive mode. Therefore, by carrying out the combination of the forward / backward continuous rotation drive mode and the forward / backward rotation drive mode, it is possible to reduce the load in the whole washing step. In addition, since the positional relationship between the rotation shaft 4A and the bearing 10 can be changed, it is possible to prevent the one-sided wear or the premature rattle between the rotation shaft 4A and the bearing 10. In addition, the tangling, twisting and wrinkling of the laundry 20 in the forward and reverse continuous rotation drive mode can be solved in the forward and reverse rotation drive mode.

In the forward and reverse continuous rotation drive mode, the control unit 9 generally rotates the rotary drum 4 by about 40 rpm, and switches by forward and reverse by one minute. It is possible to carry out in combination with the forward and reverse rotation drive mode without performing this switching or by various changes. Specifically, it can combine as shown in FIG. 6, FIG. 6 shows an α pattern. The control unit 9 executes the forward and backward rotation drive mode D alternately with the forward and reverse continuous rotation drive mode T in the α pattern. 7 shows β and γ patterns. In this pattern, the control unit 9 executes the forward and backward rotation drive mode D between the forward and reverse switching in the forward and reverse continuous rotation drive mode T. Although not shown, the number of repetitions of the forward / reverse rotation drive mode D is different in the β pattern and the γ pattern.

In this pattern, the mechanical load is reduced by the use of the forward and reverse continuous drive mode T with a low drive load in combination with the forward and reverse drive mode D with a high drive load. In the forward and reverse continuous drive mode T, the laundry 20 is entangled, twisted, wrinkled, and the imbalance between the mechanical force applied to the laundry 20 is corrected according to the execution ratio of the forward and reverse rotation drive mode.

In particular, after the dehydration step, it is preferable to sequentially execute the α pattern, the β pattern, and the γ pattern to the drying step, and to sequentially increase the number of repetitions of the forward and reverse rotations of the forward and reverse rotation drive mode (D). By this control, the laundry 20 stuck over almost the entire circumference of the inner surface of the rotating drum 4 is reliably removed at first. Thereafter, the effect of smoothing wrinkles is increased, and the laundry 20 can be more effectively released and transferred to the drying step. As described above, the laundry 20 is efficiently dried to have a small wrinkle.

In addition, it is preferable to set the rotation pause time (pause period K) between the forward and reverse continuous rotation drive mode T and the forward and reverse rotation drive mode D. FIG. By the rest period K, the behavior of the rotary drum 4 and the laundry 20 in the driving modes T and D different from before and after is stabilized once. And the behavior of the next drive mode is performed early without difficulty, without being influenced by the behavior of the rotating drum 4 or the laundry 20 in the previous drive mode, and the drive load is reduced. A dwell time of 1 second is sufficient.

However, it is not limited to such a combination pattern of T and D modes. Moreover, you may change the execution ratio with respect to the forward / backward rotational drive mode of the forward / backward rotation drive mode according to the quantity of the laundry 20 slightly. By such a control, it is possible to maximize the resolution of the laundry 20 in the forward / reverse rotation drive mode with respect to the change in the selection conditions and the drive load caused by the elapsed time.

By applying the present invention to a drum type washing machine provided with a rotating drum in a horizontal direction or inclined, it is useful because it can eliminate entanglement, torsion, wrinkles that are strongly formed in the laundry after the dehydration step.

Claims (7)

Fish tank, A rotating drum which is formed in a cylindrical shape with a bottom and is installed in the water tank so that the rotation axis direction is inclined downward from the horizontal or horizontal direction from the front side to the bottom side to be the bottom portion, and accommodates laundry therein; A motor for rotationally driving the rotary drum; A control unit for controlling at least the motor to execute at least the washing step, the rinsing step, and the dehydration step; The control unit, The motor is rapidly driven at a rate of change which allows the laundry to adhere to the inner surface of the rotary drum by centrifugal force, thereby rapidly rotating the rotary drum, and the position of 90 degrees from the lowest position of the rotary drum, which is 0 degrees. In addition to lifting the laundry to a position of less than 180 degrees in excess of the above, the rotation of the motor is rapidly braked at a rate of change that allows the laundry to be detached from the inner surface of the rotating drum, thereby lifting the laundry of the rotating drum. A drum type washing machine which performs a forward / backward rotational driving mode in which a series of operations of dropping to the side and the opposite side are repeatedly performed in a forward / backward alternation, after completion of the dehydration step. The method according to claim 1, The said control part is a drum type washing machine which makes the maximum rotational speed of the said rotating drum at the time of forward and reverse rotation in the said forward and reverse rotation drive mode more than 50 rpm. The method according to claim 1, The control unit is a drum type washing machine that drives the motor by a second motor driving instruction that does not exceed the upper limit load of the motor, when the first motor driving instruction is exceeded the out-of-sealing limit of the motor. The method according to claim 1, The control unit continuously rotates the rotating drum at a rotational speed indicating a behavior in which the laundry lifted by the rotation of the rotating drum falls from a height at which the self-weight of the laundry overcomes the centrifugal force, and repeats the rotation direction in a forward and reverse alternating manner. To execute the forward and reverse continuous driving mode for controlling the motor to switch to And the control unit alternately executes the forward and reverse rotation drive mode and the forward and reverse continuous rotation drive mode, or executes the forward and reverse rotation drive mode between forward and reverse switching in the forward and reverse continuous rotation drive mode. The method according to claim 4, The control unit is a drum type washing machine to set the rotation pause time between the forward and reverse continuous rotation drive mode and the forward and reverse rotation drive mode. The method according to claim 4, The control unit is a drum type washing machine capable of changing the execution ratio of the forward and reverse continuous rotation drive mode and the forward and reverse rotation drive mode. The method according to claim 6, The control unit changes the execution ratio of the forward and reverse continuous rotation drive mode and the forward and reverse rotation drive mode according to the elapsed time or the amount of laundry.