JPH11244569A - Drum type washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the damage of laundry after washing and to obtain a good finish and improve touch even in the case of the quantity of laundry being small in a drum type washing machine where each process of washing, rinsing and dehydration processes are each controlled successively in a rotating drum horizontally and rotatably disposed. SOLUTION: A rotating drum rotated almost horizontally while enclosing the laundry is driven by a first motor 18 and a second motor 19, and the action of the first motor 18 and second motor 19 is controlled by a control means 24 to successively control each process of washing, rinsing and dehydration. At this time, the rotating speed or driving rate per unit time of the rotating drum in the rinsing process is changed in the case of detecting that the quantity of laundry in the rotating drum is smaller than the first specified quantity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drum type washing machine for sequentially controlling processes such as washing, rinsing, and dewatering in a rotating drum disposed rotatably in a substantially horizontal direction.

[0002]

2. Description of the Related Art Conventionally, this type of drum type washing machine has been configured as shown in FIG. Hereinafter, the configuration will be described.

[0003] As shown in the figure, a rotary drum 1 is provided with a large number of water passage holes 2 on the entire periphery thereof and is rotatably disposed in a water receiving tank 3. One end of a rotating shaft 4 provided in a substantially horizontal direction at the center of rotation of the rotating drum 1 is fixed, and a drum pulley 5 is fixed to the other end of the rotating shaft 4. The motor 6 is connected to the drum pulley 5 by a belt 7 and drives the rotary drum 1 to rotate. A cover 8 is provided at the opening of the rotating drum 1 so as to be openable and closable.

The water receiving tub 3 is provided with a spring body 1 from the washing machine body 9.
0 and swingably suspended, vibration damping damper 11 reduces vibration at the start of spin-drying, and vibration-damping support so that vibration during steady spin-drying is not transmitted to washing machine body 9.
A balancer 12 for reducing vibration during dehydration is provided.
The heater 13 heats the washing water in the water receiving tub 3.

[0005] One end of a hose 14 for drainage is connected to the lower part of the water receiving tub 3, and the other end of the hose 14 is connected to a drainage pump 15 to drain the washing water in the water receiving tub 3. The water supply valve 16 supplies water into the water receiving tank 3. The control device 17 controls operations of the motor 6, the heater 13, the drain pump 15, the water supply valve 16, and the like, and sequentially controls a series of steps such as washing, rinsing, and dehydration.

The operation of the above configuration will be described. After the lid 8 is opened and the laundry is put into the rotating drum 1 and a power switch (not shown) is turned on, the operation is started by operating a start switch (not shown) provided in the control device 17. When the water supply valve 16 operates to supply water, and when a predetermined water level is detected by a water level detection means (not shown), the water supply is stopped and the motor 6 is driven. In the washing process, the rotating drum 1 is rotated forward and stopped at a predetermined rotation speed and a predetermined time by the motor 6 while supplying replenishing water because the laundry contains water.
The laundry in the rotating drum 1 is turned upside down and stopped, and is lifted and dropped on the water surface.

At this time, the heater 13 is energized to heat the washing water in the water receiving tub 3 while controlling it at a predetermined temperature. When the washing process is completed, the drainage pump 15 operates to drain the washing water in the water receiving tub 3. The same operation as the washing process is performed in the rinsing process.

In the dewatering process, the rotary drum 1 is driven to rotate at a high speed, and the laundry adheres to the outer peripheral portion of the rotary drum 1 and is centrifugally dewatered. At this time, when the laundry in the rotating drum 1 is shifted, that is, imbalance occurs, the swinging members such as the rotating drum 1 and the water receiving tub 3 vibrate. The vibration is attenuated, and is not transmitted to the washing machine main body 9 by the vibration isolating mechanism of the vibration isolating damper 11 during steady dehydration.

[0009]

In such a conventional structure, the rotation of the rotary drum 1 during the washing and rinsing steps is performed regardless of the amount of the laundry put into the rotary drum 1. , The number of rotations of the rotary drum 1, and the operating rate for driving the rotary drum 1 were each constant. For this reason, even when the amount of laundry is small, the same mechanical force is applied to the entire laundry as when the amount of laundry is large. Problems such as fluffing, pilling, cracking of pigment print pattern, etc. Had.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has an object to reduce the damage to the cloth after washing, improve the finish, and improve the texture even when the amount of the laundry is small. I have.

[0011]

In order to achieve the above object, the present invention drives a rotating drum which stores laundry and rotates in a substantially horizontal direction by a motor, and controls the operation of the motor by a control means to wash the laundry. When sequentially controlling each process such as rinsing and dehydration, if it is detected that the amount of laundry in the rotating drum is smaller than a first predetermined amount, the number of rotations of the rotating drum in the washing and rinsing processes or per unit time The driving ratio is changed.

Thus, even when the amount of laundry is small, it is possible to reduce the damage to the laundry after washing, improve the finish, and improve the texture.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a water receiving tank elastically supported in a washing machine main body, and a rotary drum contained in the water receiving tank and rotatably disposed. A motor for driving the rotating drum, a control means for controlling the operation of the motor, washing, rinsing, sequentially controlling each step such as dehydration, and a water level detecting means for detecting a water level of the water receiving tank, When the control unit detects that the amount of the laundry in the rotating drum is less than the first predetermined amount, the control unit performs washing and rinsing compared to when the amount of the laundry is equal to or more than a second predetermined amount that is larger than the first predetermined amount. It is configured to change the number of rotations of the rotary drum or the driving ratio per unit time in the stroke, and even if the amount of laundry is small, reduce damage to the cloth after washing and improve the finish. Improve and improve texture Door can be.

According to a second aspect of the present invention, in the first aspect of the present invention, when the control means detects that the amount of the laundry in the rotating drum is less than the first predetermined amount, the control means performs the washing and rinsing steps. The water level of the water receiving tub is higher than the predetermined water level when the laundry is at the second predetermined amount, and the rotation speed of the rotary drum is higher than the predetermined rotation speed when the laundry is at the second predetermined amount. When the amount of laundry is small, the water between the laundry becomes a cushion by raising the water level of the water receiving tank and increasing the water supply, and the mechanical power to the laundry can be softened, at the same time, By increasing the number of revolutions, the laundry can be more easily stuck in the rotating drum when the rotating drum is driven, and the impact when falling on the water surface can be reduced.
Therefore, it is possible to reduce the damage to the cloth such as fluffing and pilling of the surface of the laundry after washing and cracking of the pigment print pattern, to improve the finish, and to improve the roughness of the laundry surface and the tension of the cloth. And improve the texture.

According to a third aspect of the present invention, in the first aspect of the present invention, when the control means detects that the amount of the laundry in the rotating drum is less than the first predetermined amount, the washing and rinsing steps are performed. The water level in the water receiving tub is set higher than the predetermined water level when the laundry is at the second predetermined amount, and the rotation speed of the rotary drum is lower than the predetermined rotation speed when the laundry is at the second predetermined amount. When the amount of laundry is small, increasing the water level in the water receiving tank and increasing the amount of water supply allows the water between the laundry to become a cushion and soften the mechanical force on the laundry, and at the same time rotate By lowering the number, the laundry does not lift to the upper position when driving the rotating drum,
It can be turned around under the rotating drum, and the impact when falling on the water surface can be reduced. Therefore, even when the amount of the laundry is small, it is possible to improve the finish while reducing the damage to the fabric such as fluffing of the surface of the laundry after washing, generation of hair balls, and cracks in the pigment print pattern. The texture can be improved by suppressing the rough surface and the tension of the cloth.

According to a fourth aspect of the present invention, in the first aspect of the present invention, when the control means detects that the amount of the laundry in the rotating drum is less than the first predetermined amount, the washing and rinsing steps are performed. A rate at which the rotating drum is driven per unit time, that is, the operating rate is lower than the predetermined operating rate when the laundry is the second predetermined amount, and the machine is added to the laundry when the amount of the laundry is small. Power can be reduced, and the surface of the laundry after washing becomes fluffy,
Cloth damage such as cracks of the pigment print pattern can be reduced, the finish can be improved, and the texture can be improved by suppressing the rough surface of the laundry and the tension of the cloth.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. The same components as those in the conventional example are denoted by the same reference numerals, and description thereof is omitted.

(Embodiment 1) As shown in FIGS. 2 and 3, a first motor (motor) 18 rotates or rotates the rotating drum 1 at a predetermined rotation speed N1 (for example, 53 rpm) to wash or rinse. The second motor (motor) 19 drives the rotating drum 1 at a predetermined rotation speed N2.
(Eg, at 1000 rpm) to spin off.
The first motor 18 and the second motor 19 are constituted by induction motors,
1 and connected to a driven pulley 22.

The driven pulley 22 has two kinds of reduction ratios. The first motor 18 is connected to a driven pulley 22a having a large reduction ratio via a belt 20.
9 through a belt 21 to a driven pulley 2 having a small reduction ratio.
2b, and is fixed to the other end of the rotating shaft 4 having one end fixed to the rotation center of the rotating drum 1.

The control device 23 comprises a heater 13, a drain pump 15, a water supply valve 16, a first motor 18, a second motor 1
9 and the like, and is configured as shown in FIG. The control means 24 is constituted by a microcomputer, and the heater 13 and the drain pump 1 are connected via a power switching means 25 constituted by a bidirectional thyristor or the like.
5, water supply valve 16, first motor 18, second motor 19
And the like, and sequentially controls a series of steps of washing, rinsing, and dewatering.

The input setting means 26 is for inputting setting of a course or a process required by a user, start of operation, and the like. The display means 27
The contents of the setting by the input setting means 26, the operation state, and the like are displayed. The water level detecting means 28 detects the water level in the water receiving tank 3, and the water temperature detecting means 29 detects the water temperature in the water receiving tank 3 and inputs the detected water temperature to the control means 24. The rotation speed detecting means 30 detects the rotation speed of the rotary drum 1 by detecting the rotation speed of the first motor 18, and inputs the rotation speed to the control means 24. The storage means 31 stores data necessary for a series of controls. 32 is a power switch, 33
Is a commercial power supply.

When the operation is started, the control means 24 controls the first motor 18 to rotate the rotating drum 1 at a predetermined rotational speed N1 (5
After rotating at 3 rpm, the laundry in the rotating drum is loosened, the rotating drum 1 is started up to a predetermined rotation speed N3 (for example, 600 rpm) by the second motor 19, and the second motor 19 is turned off. Change in the number of rotations during the inertial rotation of the rotary drum 1, for example, when the number of rotations is 500 rpm to 6
The amount (cloth amount) of the laundry put into the rotating drum 1 is detected based on the number of rotations after a lapse of seconds.

The operation of the above configuration will be described.
Is opened, the laundry is put into the rotating drum 1, the power switch 32 is turned on, the input setting means 26 is used to continuously set the washing process to the dehydrating process, and a start / pause switch (not shown) is set. When the operation is started by turning on, the rotating drum 1 is first rotated by the first motor 18 at a predetermined rotation speed N.
After the laundry in the rotating drum is loosened by driving at 1 (53 rpm), the rotating drum 1 is started up to a predetermined rotation speed N3 (for example, 600 rpm) by the second motor 19,
The energization of the second motor 19 is cut off, and the rotation speed of the rotary drum 1 during the inertial rotation changes, for example, when the rotation speed is
The amount of laundry (cloth amount) put into the rotating drum 1 is detected based on the number of rotations after a lapse of 6 seconds from.

Thereafter, the water supply valve 16 is operated to supply water, and when a predetermined water level is detected by the water level detection means 28, the water supply is stopped and the rotary drum 1 is driven by the first motor 18. In the washing process, the rotating drum 1 is driven while replenishing water because the laundry contains water, and the laundry in the rotating drum 1 is lifted and dropped on the water surface.

At this time, the heater 13 is energized to heat the washing water in the water receiving tub 3 while controlling it at a predetermined temperature. When the washing process is completed, the drainage pump 15 operates to drain the washing water in the water receiving tub 3. The same operation as the washing process is performed in the rinsing process. In the dehydration process, the rotating drum 1
Is rotated at a high speed, and the laundry adheres to the outer peripheral portion of the rotating drum 1 and is centrifugally dehydrated.

When it is detected that the amount of laundry in the rotating drum 1 is less than a first predetermined amount (for example, 1.0 kg), the amount of laundry is increased to a second predetermined amount (for example, 4.0 k) larger than the first predetermined amount.
g) In the washing and rinsing steps, the water level of the water receiving tub 3 is higher than a predetermined water level (for example, 170 mm) when the laundry is the second predetermined amount (e.g.,
0 mm) to increase the water supply amount, and drive the laundry at a rotation speed N4 (for example, 58 rpm) higher than the predetermined rotation speed N1 (53 rpm) when the laundry is the second predetermined amount.

By increasing the water level in the water receiving tub 3 and increasing the amount of supplied water, the water between the laundry serves as a cushion, and the mechanical force on the laundry can be reduced. At the same time, by increasing the number of rotations, the laundry can be easily stuck in the rotating drum 1 when the rotating drum 1 is driven, and the impact when falling on the water surface can be reduced.

This makes it possible to reduce the damage to the cloth such as fluffing and pilling of the surface of the laundry after washing and cracking of the pigment print pattern, to improve the finish, and to improve the roughness of the surface of the laundry. And the tension of the cloth can be suppressed to improve the texture.

(Embodiment 2) Control means 24 in FIG.
When the amount of the laundry in the rotating drum 1 is detected to be less than the first predetermined amount, the water level of the water receiving tub 3 in the washing and rinsing steps is higher than the predetermined water level when the laundry is the second predetermined amount. At the same time, the rotation speed of the rotating drum 1 is configured to be lower than the predetermined rotation speed when the laundry is the second predetermined amount. Other configurations are the same as those in the first embodiment.

The operation of the above configuration will be described.
Is opened, the laundry is put into the rotating drum 1, the power switch 32 is turned on, the input setting means 26 is used to continuously set the washing process to the dehydrating process, and a start / pause switch (not shown) is set. When the operation is started by turning on, the rotating drum 1 is first rotated by the first motor 18 at a predetermined rotation speed N.
After the laundry in the rotary drum is loosened by driving at 1 (for example, 53 rpm), the rotary drum 1 is started up to a predetermined rotation speed N3 (for example, 600 rpm) by the second motor 19 and the second motor 19 is energized. Is changed, and the rotation speed of the rotary drum 1 during coasting rotation changes, for example, when the rotation speed is 50
The amount of laundry (cloth amount) put into the rotating drum 1 is detected based on the number of rotations after 6 seconds from 0 rpm.

Thereafter, when the water supply valve 16 operates to supply water, and when a predetermined water level is detected by the water level detection means 28, the water supply is stopped and the rotary drum 1 is driven by the first motor 18. In the washing process, the rotating drum 1 is driven while replenishing water because the laundry contains water, and the laundry in the rotating drum 1 is lifted and dropped on the water surface.

At this time, the heater 13 is energized to heat the washing water in the water receiving tub 3 while controlling it at a predetermined temperature. When the washing process is completed, the drainage pump 15 operates to drain the washing water in the water receiving tub 3. The same operation as the washing process is performed in the rinsing process. In the dehydration process, the rotating drum 1
Is rotated at a high speed, and the laundry adheres to the outer peripheral portion of the rotating drum 1 and is centrifugally dehydrated.

When it is detected that the amount of laundry in the rotating drum 1 is less than a first predetermined amount (for example, 1.0 kg), the amount of laundry is larger than a first predetermined amount (for example, 4.0 k).
g) In the washing and rinsing steps, the water level of the water receiving tub 3 is higher than a predetermined water level (for example, 170 mm) when the laundry is the second predetermined amount (e.g.,
0 mm) to increase the water supply amount, and drive the laundry at a rotation speed N5 (for example, 48 rpm) lower than the predetermined rotation speed N1 (53 rpm) when the laundry is the second predetermined amount.

By increasing the water level in the water receiving tub 3 and increasing the amount of water supplied, the water between the laundry becomes a cushion, and the mechanical force on the laundry can be reduced. At the same time, by lowering the rotation speed, the laundry does not lift to the upper position when the rotating drum 1 is driven, but turns around below the inside of the rotating drum 1 so that the impact when falling on the water surface can be reduced.

This makes it possible to reduce the damage to the cloth such as fluffing and pilling of the surface of the laundry after washing and cracking of the pigment print pattern, to improve the finish, and to improve the roughness of the surface of the laundry. And the tension of the cloth can be suppressed to improve the texture.

(Embodiment 3) The control means 24 in FIG.
When the amount of laundry in the rotating drum 1 is detected to be less than the first predetermined amount, the rotating drum 1 in the washing and rinsing steps
Of the laundry per unit time, that is, the operating rate is lower than the predetermined operating rate when the laundry is the second predetermined amount. Other configurations are the same as those in the first embodiment.

The operation of the above configuration will be described.
Is opened, the laundry is put into the rotating drum 1, the power switch 32 is turned on, the input setting means 26 is used to continuously set the washing process to the dehydrating process, and a start / pause switch (not shown) is set. When the operation is started by turning on, the rotating drum 1 is first rotated by the first motor 18 at a predetermined rotation speed N.
After the laundry in the rotary drum is loosened by driving at 1 (for example, 53 rpm), the rotary drum 1 is started up to a predetermined rotation speed N3 (for example, 600 rpm) by the second motor 19 and the second motor 19 is energized. Is changed, and the rotation speed of the rotary drum 1 during coasting rotation changes, for example, when the rotation speed is 50
The amount of laundry (cloth amount) put into the rotating drum 1 is detected based on the number of rotations after 6 seconds from 0 rpm.

Thereafter, when the water supply valve 16 is operated to supply water, and when a predetermined water level is detected by the water level detection means 28, the water supply is stopped and the rotary drum 1 is driven by the first motor 18. In the washing process, the rotating drum 1 is driven while replenishing water because the laundry contains water, and the laundry in the rotating drum 1 is lifted and dropped on the water surface.

At this time, the heater 13 is energized to heat the washing water in the water receiving tub 3 while controlling it at a predetermined temperature. When the washing process is completed, the drainage pump 15 operates to drain the washing water in the water receiving tub 3. The same operation as the washing process is performed in the rinsing process. In the dehydration process, the rotating drum 1
Is rotated at a high speed, and the laundry adheres to the outer peripheral portion of the rotating drum 1 and is centrifugally dehydrated.

When it is detected that the amount of laundry in the rotating drum 1 is less than the first predetermined amount (eg, 1.0 kg), the amount of laundry is at least a second predetermined amount (eg, 4.0 kg) larger than the first predetermined amount. Compared to the above cases, in the washing and rinsing steps, the rate of driving the predetermined rotating drum 1 per unit time when the laundry is the second predetermined amount, that is, the operating rate (for example, 20-second normal rotation driving, 3 seconds In the case of stop, reverse drive for 20 seconds, and stop for 3 seconds, the operation rate is 40 seconds / 46 seconds = 87.
%) (For example, in the case of a 10-second rotation drive and a 13-second stop, the operation rate is 20 seconds / 46 seconds = 43%).

Thus, when the amount of laundry is small, the mechanical force applied to the laundry can be reduced, and the surface of the laundry after washing can be made to have fluff, pills, cracks in the pigment print pattern, and the like. Cloth damage can be reduced, the finish can be improved, and the texture can be improved by suppressing the rough surface of the laundry and the tension of the cloth.

In each of the above embodiments, the amount of laundry in the rotating drum 1 is reduced to a first predetermined amount (for example, 1.0 k
g), the drum rotation speed and the operation rate for driving the drum are changed as compared with the second predetermined amount (for example, 4.0 kg) or more that is larger than the first predetermined amount. A plurality of operation rates for driving the drum may be prepared depending on the amount of the laundry.In short, if the amount of the laundry becomes small, the water level is raised above a predetermined water level and the drum rotation speed is changed from the predetermined rotation speed, or What is necessary is just to make it lower than the operation rate.

Similarly, in each of the above embodiments, the case where the laundry is different from the first predetermined amount (for example, 1.0 kg) and the second predetermined amount (for example, 4.0 kg) has been described. The first predetermined amount and the second predetermined amount may be the same (for example, the first predetermined amount is 3.0 kg, and the second predetermined amount is 3.0 kg).
In other words, it is only necessary to be able to distinguish between when the amount of laundry is small and when it is large.

[0044]

As described above, according to the first aspect of the present invention, a water receiving tank elastically supported in the main body of the washing machine, and the water receiving tank is rotatably provided in the water receiving tank. A rotating drum, a motor for driving the rotating drum, control means for controlling the operation of the motor, for sequentially controlling each step of washing, rinsing, dehydration, etc., and a water level detecting means for detecting a water level of the water receiving tank. When the control means detects that the amount of laundry in the rotating drum is less than a first predetermined amount,
Compared to when the amount of laundry is equal to or more than a second predetermined amount, which is larger than the first predetermined amount, the number of rotations of the rotary drum or the rate of driving per unit time in the washing and rinsing steps is changed. Even when the amount is small, it is possible to reduce the damage of the laundry after washing, improve the finish, and improve the texture.

According to the second aspect of the present invention, when the control means detects that the amount of laundry in the rotating drum is less than the first predetermined amount, the water level in the water receiving tank in the washing and rinsing steps is controlled. Is set higher than the predetermined water level when the laundry is the second predetermined amount, and the rotation speed of the rotating drum is higher than the predetermined rotation speed when the laundry is the second predetermined amount. If the water level is low, increasing the water level in the water receiving tank and increasing the amount of water supplied allows the water between the laundry to become a cushion, reducing the mechanical power to the laundry, and at the same time,
By increasing the number of revolutions, the laundry can be more easily stuck in the rotating drum when the rotating drum is driven, and the impact when falling on the water surface can be reduced. Therefore, it is possible to reduce the damage to the cloth such as fluffing and pilling of the surface of the laundry after washing and cracking of the pigment print pattern, to improve the finish, and to improve the roughness of the laundry surface and the tension of the cloth. And improve the texture.

According to the third aspect of the present invention, when the control means detects that the amount of laundry in the rotating drum is less than the first predetermined amount, the water level in the water receiving tank in the washing and rinsing steps is controlled. Is set higher than the predetermined water level when the laundry is at the second predetermined amount, and the rotation speed of the rotary drum is lower than the predetermined rotation speed when the laundry is at the second predetermined amount. When the water level is low, increasing the water level in the water receiving tank and increasing the amount of water supply allows the water between the laundry to become a cushion, reducing the mechanical force on the laundry, and at the same time, lowering the rotation speed to reduce the rotation of the rotating drum. When the laundry is driven, the laundry does not lift to the upper position, but turns around under the rotating drum, so that the impact when falling on the water surface can be reduced. Therefore, even when the amount of the laundry is small, it is possible to improve the finish while reducing the damage to the fabric such as fluffing of the surface of the laundry after washing, generation of hair balls, and cracks in the pigment print pattern. The texture can be improved by suppressing the rough surface and the tension of the cloth.

According to the fourth aspect of the present invention, when the control means detects that the amount of the laundry in the rotating drum is less than the first predetermined amount, the control unit controls the unit time of the rotating drum in the washing and rinsing steps. Since the driving ratio per hit, that is, the operating rate is lower than the predetermined operating rate when the laundry is the second predetermined amount, it is possible to reduce the mechanical force applied to the laundry when the amount of the laundry is small, Reduces damage to the fabric, such as fluffing, pilling, and cracks in pigment prints, on the surface of the laundry after washing, and improves the finish.It also suppresses roughening of the surface of the laundry and tension on the cloth. You can improve the texture.

[Brief description of the drawings]

FIG. 1 is a block circuit diagram of a drum type washing machine according to a first embodiment of the present invention.

FIG. 2 is a sectional view of the drum type washing machine.

FIG. 3 is a partially cutaway rear view of the drum type washing machine.

FIG. 4 is a sectional view of a conventional drum-type washing machine.

[Explanation of symbols]

 Reference Signs List 1 rotating drum 3 water receiving tank 9 washing machine main body 18 first motor (motor) 19 second motor (motor) 24 control means 28 water level detecting means

Claims (4)

[Claims] 1. A water receiving tank elastically supported in a washing machine main body, a rotating drum included in the water receiving tank and rotatably disposed, a motor for driving the rotating drum, and an operation of the motor. Control means for sequentially controlling each process such as washing, rinsing, dehydration, etc., and water level detecting means for detecting a water level in the water receiving tank, wherein the control means is configured to control an amount of laundry in the rotating drum. Is less than the first predetermined amount,
A drum-type washing machine configured to change the number of revolutions of the rotary drum or the rate of driving per unit time in a washing and rinsing process as compared with when the amount of laundry is equal to or greater than a second predetermined amount which is larger than the first predetermined amount. . 2. When the amount of laundry in the rotating drum is detected to be less than a first predetermined amount, the control means determines a water level in a water receiving tank in a washing and rinsing process when the amount of laundry is a second predetermined amount. 2. The drum type washing machine according to claim 1, wherein the water level is higher than a predetermined water level, and the rotation speed of the rotating drum is higher than a predetermined rotation speed when the laundry has a second predetermined amount. 3. When the control means detects that the amount of laundry in the rotating drum is less than the first predetermined amount, the control means determines the water level of the water receiving tank during the washing and rinsing steps when the laundry has the second predetermined amount. 2. The drum type washing machine according to claim 1, wherein the water level is higher than the predetermined water level and the rotation speed of the rotating drum is lower than the predetermined rotation speed when the laundry is the second predetermined amount. And a control unit that, when detecting the amount of laundry in the rotating drum is less than a first predetermined amount, drives the rotating drum per unit time in a washing and rinsing process;
2. The drum type washing machine according to claim 1, wherein the operation rate is lower than a predetermined operation rate when the amount of the laundry is the second predetermined amount.