JP2022161288A - Drum type washing machine - Google Patents

Abstract

To acquire a press-washing effect in which detergent water is impregnated into a mattress or the mattress is wrung.SOLUTION: A drum type washing machine can execute a washing step and a rinsing step. The drum type washing machine includes: an outer tub arranged in a housing; a drum arranged in the outer tub, and rotatable around a horizontal shaft; a drive motor for rotating the drum in a predetermined direction; and control means for controlling the drive motor. The control means controls, in the washing step and the rinsing step, the drive motor in such a manner that high-speed rotation in which the drum rotates at a larger rotational frequency than a predetermined rotational frequency and low-speed rotation in which the drum rotates at the rotational frequency equal to or less than the predetermined rotational frequency are performed.SELECTED DRAWING: Figure 5

Description

The present invention relates to a drum-type washing machine.

When the laundry is washed in the drum-type washing machine, it is common to operate the laundry in the order of washing, rinsing, and spin-drying after the laundry is loaded into the drum. In the washing process and the rinsing process, a water supplying operation for supplying water into the drum, a washing operation for rotating the drum, and a draining operation for draining water from the drum are sequentially performed, and then the dewatering operation is performed.

During the washing operation, the horizontal shaft type drum is rotated in the outer tub filled with water at the bottom, and the laundry is lifted and dropped by the baffle provided in the drum, and the laundry is moved to the inner circumference of the drum. Laundry is washed by hitting it against a surface (for example, Patent Document 1).

JP 2018-33512

2. Description of the Related Art Conventionally, in addition to laundry such as clothes, mattresses may be washed in a drum-type washing machine. In this case, similarly to laundry such as clothes, after the mattress is loaded into the drum, the washing process, the rinsing process, and the spin-drying process are performed in this order.

However, when washing the futon in a drum-type washing machine, if you put it in as it is and wash it by normal washing, the futon will be biased in one direction in the drum, and the dehydration will not be possible. It may collapse. Therefore, when washing a futon in a normal washing course, it is conceivable to wash the futon by wrapping it with a string or the like to make it difficult to move, and then throwing the futon into the washing machine. However, in this method, since the mattress is rolled up, it is difficult for water to permeate the inside of the mattress as compared to the outside, and it is difficult to obtain a sufficient cleaning effect.

Also, in a washing machine with a special course for mattresses, the mattresses are installed in a state where they stick evenly along the inner wall of the drum without being wrapped with strings, and the drum always rotates in a fixed direction from the start of operation to the end of operation. A possible washing method is to keep rotating the drum several times or more so that the mattress can be kept stuck to the inner wall of the drum. However, in order to keep the mattress sticking to the inner wall of the drum, it is necessary to rotate the drum at a higher speed than during normal washing. It is difficult to obtain a cleaning effect.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a drum-type washing machine that can sufficiently wash, for example, a mattress without unevenness.

A drum-type washing machine of the present invention is a drum-type washing machine capable of performing a washing process and a rinsing process, and comprises an outer tub disposed within a housing, and an outer tub disposed within the outer tub and extending along a horizontal axis or in a horizontal direction. a drum rotatable about an inclined axis that inclines with respect to the washing process; a driving motor for rotating the drum in a predetermined direction; In at least one of the rinsing steps, the drive motor rotates at a high speed, in which the drum rotates at a rotation speed greater than a predetermined rotation speed, and at a low speed, in which the drum rotates at a rotation speed equal to or lower than the predetermined rotation speed. is characterized by controlling

In the drum-type washing machine of the present invention, it is preferable that the control means controls the drive motor so as to alternately switch between the high-speed rotation and the low-speed rotation in at least one of the washing process and the rinsing process. be.

In the drum-type washing machine of the present invention, the control means alternately switches between the high-speed rotation and the low-speed rotation during the washing process, and alternately switches between the high-speed rotation and the low-speed rotation during the rinsing process. It is preferable that the drive motor is controlled so that a cycle of switching the rotation speed in the washing process and a cycle of switching the rotation speed in the rinsing process are different.

In the drum-type washing machine of the present invention, it is preferable that the cycle of switching the rotation speed in the rinsing process is shorter than the cycle of switching the rotation speed in the washing process.

In the drum-type washing machine of the present invention, it is preferable that the control means controls the drive motor so that the low-speed rotation is performed for a longer period of time than the high-speed rotation during the washing process.

In the drum-type washing machine of the present invention, the drum is switched to two or more different rotation speeds in at least one of the washing process and the rinsing process. Therefore, when the drum rotates at a high speed, the detergent water inside the drum is pushed out by the centrifugal force of the drum rotation and is lightly dehydrated from the mattress. Water accumulates, and the mattress comes to be soaked in the detergent water. Therefore, the effect of pressing and washing is obtained by impregnating the futon with detergent water and squeezing the futon, thereby improving the detergency and suppressing unevenness in washing.

In the drum-type washing machine of the present invention, high-speed rotation and low-speed rotation are alternately switched in at least one of the washing process and the rinsing process. Therefore, it is possible to more effectively obtain the washing effect of impregnating the mattress with detergent water and squeezing the mattress.

In the drum-type washing machine of the present invention, it is possible to individually set the rotational speeds for high-speed rotation and low-speed rotation in the washing process and the rinsing process. Therefore, it is possible to change the strength of press washing in the washing process and the rinsing process. It can be washed with strong pressure.

In the drum-type washing machine of the present invention, the cycle of switching between high-speed rotation and low-speed rotation in the rinsing process is made shorter than the cycle of switching between high-speed rotation and low-speed rotation in the washing process, so that the number of times of push washing can be increased. Therefore, the rinsing effect can be enhanced by increasing the number of times the rinsing water passes through the mattress.

In the drum-type washing machine of the present invention, the time during low-speed rotation can be set longer than the time during high-speed rotation in the washing process, so that the soaking time in the detergent water can be lengthened. Therefore, the detergent water comes to pass through the mattress, and the detergent water can sufficiently penetrate into the interior of the mattress, enhancing the cleaning effect.

1 is a perspective view of a drum-type washing machine 1 according to an embodiment of the present invention; FIG. FIG. 2 is a side sectional view showing the configuration of the drum-type washing machine 1 of FIG. 1; 3 is a control block diagram of the drum-type washing machine 1; FIG. It is a flowchart which shows the operation|movement of the washing process of a mattress washing course. FIG. 5(a) is a diagram showing changes in the rotation speed of the drum 4 during the washing process, and FIG. 5(b) is a diagram showing changes in the rotation speed of the drum 4 during the rinsing process. FIG. 6(a) shows the state of the mattress in the drum 4 during low speed rotation, and FIG. 6(b) shows the state of the mattress in the drum 4 during high speed rotation.

A drum-type washing machine 1 according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a drum-type washing machine 1 according to an embodiment of the present invention. FIG. 2 is a side cross-sectional view showing the configuration of the drum-type washing machine 1 of FIG.

As shown in FIGS. 1 and 2, the drum-type washing machine 1 of this embodiment has a box-shaped housing 2, and the interior of the housing 2 has a substantially cylindrical inner peripheral surface. An outer tub 3 is arranged, and inside the outer tub 3, a drum 4 having a substantially cylindrical inner peripheral surface for accommodating laundry is supported by a main shaft 5 extending in the front-rear direction. The drum 4 is rotatable around a horizontal axis.

Formed on the front surface of the housing 2 are an operation section 2a for a user to operate, and a clothing slot 6 facing an opening 4a formed at the front end of the drum 4. As shown in FIG. The housing 2 is provided with a door 8 for opening and closing the clothes inlet 6. The clothes inlet 6 is opened and closed by the door 8, and the laundry can be put in and taken out of the drum 4 with the door 8 opened. It is possible.

A plurality of baffles 4 b are provided on the inner peripheral surface of the drum 4 so as to protrude into the drum 4 . The baffle 4b is a protrusion for lifting the laundry accommodated in the drum 4. For example, during the washing process, when the drum 4 is rotated by the driving force of a driving motor 11, which will be described later, the water in the drum 4 is removed. So-called pounding washing is performed in which the contained laundry is lifted by the baffle 4b and naturally dropped.

A large number of water passage holes 4c are formed in the inner peripheral surface of the drum 4, and water supplied into the outer tub 3 during washing and rinsing flows into the drum 4 through the water passage holes 4c and is centrifuged. Water discharged from the laundry in the drum 4 during dehydration scatters toward the outer tub 3 side through the water passage holes 4c.

The main shaft 5 is rotatably supported by a bearing 5a mounted on the back wall of the outer tank 3, and a main pulley 10 is attached to the tip of the main shaft 5 projecting rearward. A drive motor 11 is installed at the bottom of the housing 2, a motor pulley 12 is attached to the rotation shaft of the drive motor 11, and the torque of the motor pulley 12 is transmitted to the main pulley 10 via a timing belt 16. be. Accordingly, when the drive motor 11 is driven, the drum 4 rotates about the main shaft 5 .

A water supply pipe 30 having a water supply valve 30a in the middle is connected to the upper portion of the rear wall of the outer tank 3. When the water supply valve 30a is opened, water supplied from the outside is supplied through the water supply pipe 30. is supplied to the outer tank 3. A drain pipe 31 having a drain valve 31a in the middle is connected to a drain port provided at the bottom of the outer tank 3. When the drain valve 31a is opened, the water in the outer tank 3 drains into the drain pipe. 31 is discharged out of the machine.

FIG. 3 is a control block diagram of the drum-type washing machine 1. As shown in FIG. The control unit 50 of the drum-type washing machine 1, as shown in FIG. A RAM for temporarily storing data and the like used when executing the program is provided. The operation of drum-type washing machine 1 is controlled by control unit 50 . The control unit 50 is connected to the operation unit 2a, the water supply valve 30a, the water discharge valve 31a, and the drive motor 11. As shown in FIG.

In the drum-type washing machine 1, the user can select a standard washing course or a mattress washing course by operating the operation section 2a of the housing 2. FIG. Although various operation courses can be selected by operating the operation portion 2a of the housing 2 in the drum-type washing machine 1, only the mattress washing course will be described below.

The futon washing course is a course used when washing a futon, and operation is carried out in order of a washing process, a rinsing process and a dehydration process.

The washing process of the mattress washing course will be described with reference to FIG. FIG. 4 is a flow chart showing the operation of the washing process of the mattress washing course.

<Step S1>
In step S1, the controller 50 rotates the drum 4 at a low speed. In this embodiment, the controller 50 controls the drive motor 11 so that the drum 4 rotates at a low speed of N1 (eg, 60 rpm). After that, the process proceeds to step S2.

<Step S2>
In step S<b>2 , the control unit 50 opens the water supply valve 30 a to supply water to the outer tub 3 . At this time, the control unit 50 closes the drain valve 31a, and the supplied water is stored in the outer tank 3 and is also stored in the drum 4 through the water passage hole 4c.

<Step S3>
In step S3, the controller 50 repeatedly determines whether or not the water level in the outer tub 3 has reached the set water level for the washing process. When the control unit 50 determines that the water level in the outer tub 3 has reached the set water level, the control unit 50 closes the water supply valve 30a and proceeds to step S4.

<Step S4>
In step S4, the controller 50 determines whether the drum 4 is rotating at a low speed. When the controller 50 determines that the drum 4 is rotating at a low speed, the process proceeds to step S5. When the controller 50 determines that the drum 4 is not rotating at a low speed, the process proceeds to step S7.

<Step S5>
In step S5, the controller 50 determines whether or not a predetermined time T1 has elapsed after the drum 4 started rotating at a low speed. In this embodiment, the predetermined time T1 is 60 seconds, for example. If the controller 50 determines that the predetermined time T1 has elapsed after the drum 4 starts rotating at a low speed, the process proceeds to step S6. If the controller 50 determines that the predetermined time T1 has not elapsed since the drum 4 started to rotate at a low speed, the process proceeds to step S9.

<Step S6>
In step S6, the controller 50 starts rotating the drum 4 at high speed because the low speed rotation of the drum 4 has continued for the predetermined time T1. In this embodiment, the controller 50 controls the drive motor 11 so that the drum 4 rotates at a high speed of N2 (80 rpm, for example). After that, the process proceeds to step S9.

<Step S7>
In step S7, the controller 50 determines whether or not a predetermined time T2 has elapsed after the drum 4 started rotating at high speed. In this embodiment, the predetermined time T2 is, for example, 30 seconds. If the controller 50 determines that the predetermined time T2 has elapsed after the drum 4 starts rotating at high speed, the process proceeds to step S8. If the controller 50 determines that the predetermined time T2 has not elapsed since the drum 4 started rotating at high speed, the process proceeds to step S9.

<Step S8>
In step S8, the controller 50 starts rotating the drum 4 at a low speed because the high speed rotation of the drum 4 continues for the predetermined time T2. After that, the process proceeds to step S9.

<Step S9>
In step S9, the control unit 50 determines whether or not the washing process has ended. In this embodiment, the time required for the washing process is set in advance, and the washing process ends when the required time elapses after the low-speed rotation of the drum 4 is started in step S1. When the control unit 50 determines that the washing process has ended, the process proceeds to step S10. If the control unit 50 determines that the washing process has not ended, the process proceeds to step S4.

<Step S10>
In step S10, the control unit 50 opens the drain valve 31a to drain the washing water in the outer tub 3 to the outside of the machine through the drain pipe 31 since the washing process is completed, and the process is completed.

FIG. 5(a) shows changes in the rotational speed of the drum 4 during the washing process described above. When the washing process is started, low speed rotation of the drum 4 is started. That is, in the present embodiment, the drum 4 rotates at a rotational speed N1 (eg, 60 rpm) at a low speed for a predetermined time T1 (eg, 60 sec). When the low-speed rotation of the drum 4 continues for a predetermined time T1, the rotation of the drum 4 is switched to high-speed rotation. That is, in the present embodiment, the drum 4 continues to rotate at a high speed N2 (80 rpm, for example) for a predetermined time T2 (30 seconds, for example). After the high-speed rotation of the drum 4 continues for the predetermined time T2, low-speed rotation and high-speed rotation similar to those described above are alternately repeated until the time required for the washing process elapses.

In the rinsing process of the mattress washing course, the drum 4 alternately repeats low-speed rotation and high-speed rotation in the same manner as the washing process described above.

The difference between the washing process and the rinsing process is the number of rotations of the drum 4 during low-speed rotation and high-speed rotation, and the predetermined time during which the rotation is continued. That is, in the washing process, low-speed rotation at the drum rotation speed N1 for a predetermined time period T1 and high-speed rotation at the drum rotation speed N2 for a predetermined time period T2 are alternately repeated, whereas in the rinsing process, the drum rotation speed is N3. Low-speed rotation for a predetermined time T3 and high-speed rotation for a predetermined time T4 at a drum rotation speed N4 are alternately repeated.

Therefore, in the flowchart showing the operation of the washing process in FIG. 4, instead of determining whether the predetermined time T1 has elapsed in step S5, it is determined whether the predetermined time T3 has elapsed and the predetermined time T2 is determined in step S7. If a determination is made as to whether a predetermined time T4 has elapsed instead of determining whether T4 has elapsed, a flow chart showing the operation of the rinsing process can be obtained. In step S9, when determining whether or not the rinsing process has ended, the preset required time for the rinsing process is used.

FIG. 5(b) shows changes in the rotation speed of the drum 4 during the rinsing process. When the rinsing process starts, the drum 4 starts rotating at a low speed. That is, in this embodiment, the drum 4 rotates at a rotational speed N3 (eg, 60 rpm) at a low speed for a predetermined time T3 (eg, 60 sec). When the low-speed rotation of the drum 4 continues for a predetermined time T3, the rotation of the drum 4 is switched to high-speed rotation. That is, in the present embodiment, the high-speed rotation of the drum 4 at a rotational speed N4 (eg, 100 rpm) continues for a predetermined time T4 (eg, 30 seconds). After the high-speed rotation of the drum 4 continues for the predetermined time T4, low-speed rotation and high-speed rotation similar to those described above are alternately repeated until the time required for the rinsing process elapses.

In the drum-type washing machine 1 of the present embodiment, as shown in FIG. 6(a), the rotation speed during low-speed rotation is such that the centrifugal force during rotation of the drum is small and the detergent water is accumulated in the drum 4, and the futon is washed. is immersed in detergent water (for example, 50 to 70 rpm). This allows the detergent water to soak into the mattress.

As shown in FIG. 6(b), the rotation speed during high-speed rotation is a rotation speed ( For example, it is set to 70 to 100 rpm). As a result, detergent water can be squeezed out from inside the mattress.

As described above, in the drum-type washing machine 1 of the present embodiment, since low-speed rotation and high-speed rotation are switched at regular intervals, the mattress is soaked with detergent water and the mattress is squeezed repeatedly. You can get the washing effect.

In the washing process, the predetermined time T1 during low speed rotation is set longer than the predetermined time T2 during high speed rotation in order to lengthen the time for which the mattress is soaked in the detergent water. As a result, the detergent water can pass through the mattress, and the detergent water can sufficiently penetrate into the interior of the mattress, thereby enhancing the cleaning effect.

On the other hand, in the rinsing process, the predetermined time T3 during low speed rotation and the predetermined time T4 during high speed rotation are set to be the same in order to push out the detergent component soaked into the mattress. This increases the number of times the rinsing water passes through the mattress, thereby enhancing the rinsing effect.

The drum-type washing machine 1 of the present embodiment is a drum-type washing machine capable of performing a washing process and a rinsing process, and includes an outer tub 3 arranged inside a housing 2 and a horizontal A drum 4 rotatable around an axis, a drive motor 11 for rotating the drum 4 in a predetermined direction, and a control unit 50 as control means for controlling the drive motor 11 are provided. And in the rinsing process, the drive motor 11 is controlled so that the drum 4 rotates at a higher speed than a predetermined rotation speed and the drum 4 rotates at a lower speed than the predetermined rotation speed. .

As a result, in the drum-type washing machine 1 of the present embodiment, the rotation speed of the drum 4 is switched to two or more different stages in at least one of the washing process and the rinsing process. Therefore, when the drum rotates at a high speed, the detergent water in the drum 4 is pushed out by the centrifugal force generated when the drum rotates, and is lightly dehydrated from the mattress. Detergent water accumulates in and the mattress is soaked in water. Therefore, the effect of pressing and washing is obtained by impregnating the futon with detergent water and squeezing the futon, thereby improving the detergency and suppressing unevenness in washing.

In the drum-type washing machine 1 of this embodiment, the control unit 50, which is a control means, controls the drive motor 11 so as to alternately switch between high-speed rotation and low-speed rotation during the washing process and the rinsing process.

As a result, in the drum-type washing machine 1 of the present embodiment, it is possible to individually set the rotation speeds for high-speed rotation and low-speed rotation in the washing process and the rinsing process. Therefore, it is possible to change the strength of press washing in the washing process and the rinsing process. It can be washed with strong pressure.

In the drum-type washing machine 1 of the present embodiment, the control unit 50, which is the control means, alternately switches between high-speed rotation and low-speed rotation in the washing process, and alternately switches between high-speed rotation and low-speed rotation in the rinsing process. The drive motor 11 is controlled, and the period Ta (total of the predetermined time T1 of high-speed rotation and the predetermined time T2 of low-speed rotation) for switching the number of rotations in the washing process and the period Tb (predetermined time T3 of high-speed rotation) for switching the number of rotations in the rinsing process and the total of the predetermined time T4 of low speed rotation).

As a result, in the drum-type washing machine 1 of the present embodiment, it is possible to individually set the rotation speeds for high-speed rotation and low-speed rotation in the washing process and the rinsing process. Therefore, it is possible to change the strength of press washing in the washing process and the rinsing process. It can be washed with strong pressure.

In the drum-type washing machine 1 of the present embodiment, the cycle Tb for switching the rotation speed in the rinsing process is shorter than the cycle Ta for switching the rotation speed in the washing process.

As a result, in the drum-type washing machine 1 of the present embodiment, the cycle Tb for switching the rotation speed in the rinsing process is made shorter than the cycle Ta for switching the rotation speed in the washing process, so that the number of times of push washing can be increased. Therefore, the rinsing effect can be enhanced by increasing the number of times the rinsing water passes through the mattress.

In the drum-type washing machine 1 of this embodiment, the control unit 50, which is a control means, controls the drive motor 11 so that the low speed rotation is performed for a longer time than the high speed rotation during the washing process.

As a result, in the drum-type washing machine 1 of the present embodiment, the time during low-speed rotation can be set longer than the time during high-speed rotation in the washing process, so that the soaking time in the detergent water can be lengthened. Therefore, the detergent water comes to pass through the mattress, and the detergent water can sufficiently penetrate into the interior of the mattress, enhancing the cleaning effect.

Although the embodiments of the present invention have been described above, the specific configuration of each unit is not limited to the above-described embodiments.

For example, in the above-described embodiment, the setting of the drum rotation speed in the washing process and the rinsing process can be switched in two stages, but it is not limited to this. For example, the setting of the drum rotation speed in the washing process and the rinsing process may be switchable in three or more stages.

In the above embodiment, the case where the drum 4 is rotated at low speed and at high speed in both the washing process and the rinsing process has been described. High speed rotation may be performed.

In the above embodiment, specific examples of the drum rotation speeds N1 and N2 are shown for the washing process of the mattress washing course, and specific examples of the drum rotation speeds N3 and N4 are shown for the rinsing process, but they can be set arbitrarily. . For example, the drum rotation speeds N1 and N3 during low speed rotation may be, for example, 50 to 70 rpm, and the drum rotation speeds N3 and N4 during high speed rotation may be, for example, 70 to 200 rpm, preferably 70 to 100 rpm. It may be the number of revolutions.

In the above-described embodiment, the case where the low-speed drum rotation number N1 and the high-speed drum rotation number N2 are always constant in the washing process has been described. At least one of the drum rotation speed N2 may be changed. For example, by changing the high-speed rotation speed N2 of the drum in the washing process, the washing can be strengthened or weakened. Note that at least one of the low-speed drum rotation number N3 and the high-speed drum rotation number N4 may be changed for each period Tb, which is the same for the rinsing process.

In the above embodiment, a specific example of the predetermined time T1 of low speed rotation and the predetermined time T2 of high speed rotation is shown for the washing process of the mattress washing course, and a specific example of the predetermined time T3 of low speed rotation and the predetermined time T4 of high speed rotation is shown for the rinsing process. are shown, but they can be set arbitrarily.

In the above embodiment, the case where the predetermined time T1 of low speed rotation and the predetermined time T2 of high speed rotation are always constant in the washing process has been described. At least one of T2 may be changed. For example, by changing the predetermined time T2 of high-speed rotation in the washing process, the washing can be made stronger or weaker. It should be noted that at least one of the predetermined time T1 for low speed rotation and the predetermined time T2 for high speed rotation may be changed for each cycle Tb, which is the same for the rinsing process.

In the above embodiment, the cycle Tb for switching the rotation speed in the rinsing process is shorter than the cycle Ta for switching the rotation speed in the washing process, but it is not limited thereto. In the above embodiment, the low-speed rotation is performed for a longer period of time than the high-speed rotation in the washing process, but it is not limited to this. In the above-described embodiment, in the rinsing process, the time T3 for high-speed rotation and the time T4 for low-speed rotation are set to be the same, but it is not limited to this.

In the above embodiment, the case of washing a futon was explained, but the present invention can also be applied to the case of washing a futon other than a futon, for example. In the above embodiment, the drum-type washing machine 1 capable of performing the washing process, the rinsing process, and the dehydrating process has been described, but the present invention is directed to a washing/drying machine capable of performing the drying process together with the washing process, the rinsing process, and the dehydrating process. is also applicable.

1 drum-type washing machine 2 housing 3 outer tub 4 drum 11 drive motor 50 control section (control means)

Claims (5)

A drum-type washing machine capable of performing a washing process and a rinsing process,
an outer tank disposed within the housing;
a drum disposed in the outer tank and rotatable about a horizontal axis or an inclined axis tilted with respect to the horizontal direction;
a driving motor for rotating the drum in a predetermined direction;
and a control means for controlling the drive motor,
In at least one of the washing process and the rinsing process, the control means controls high speed rotation in which the drum rotates at a rotation speed greater than a predetermined rotation speed and low speed rotation in which the drum rotates at a rotation speed equal to or lower than the predetermined rotation speed. A drum-type washing machine, wherein the drive motor is controlled to rotate. 2. The drum type according to claim 1, wherein the control means controls the drive motor so as to alternately switch between the high speed rotation and the low speed rotation in at least one of the washing process and the rinsing process. washing machine. The control means controls the drive motor so as to alternately switch between high-speed rotation and low-speed rotation in the washing process, and to alternately switch between high-speed rotation and low-speed rotation in the rinsing process,
3. The drum-type washing machine according to claim 2, wherein a cycle of switching the rotation speed in the washing process and a cycle of switching the rotation speed in the rinsing process are different. 4. The drum-type washing machine according to claim 3, wherein the cycle of switching the rotation speed in the rinsing process is shorter than the cycle of switching the rotation speed in the washing process. The drum-type washing machine according to any one of claims 1 to 4, wherein said control means controls said driving motor so that said low-speed rotation is performed for a longer time than said high-speed rotation in said washing step. machine.

Images