JPH10244091A - Drum type washing machine - Google Patents

Abstract

(57) [Summary] A drum-type washing machine capable of controlling vibration transmission force and noise to an installed floor or the like during dehydration to a small level. An unbalance detection device and an acceleration detection device for respectively detecting an amplitude at resonance and an amplitude during steady rotation of an outer tub exceeding an allowable value are provided. The rotation of the variable speed motor 9 and the drum 5 is controlled based on the output signal of the above to correct the leaning of the cloth when the amount of leaning of the cloth is large and it is difficult to start dewatering. The dehydration operation is performed with the upper limit of the steady dehydration rotation speed lowered according to the size of the amount.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a drum type washing machine.

[0002]

2. Description of the Related Art Generally, in a drum type washing machine, laundry is offset in a drum which is horizontally supported by a shaft and serves also as a washing tub and a dewatering tub (hereinafter, the offset of the laundry is also referred to as a cloth offset).
During dehydration, abnormal whirling vibration may occur. When the amplitude of the abnormal whirling vibration exceeds a preset value, a vibration switch is used to balance the laundry in the drum, as disclosed in Japanese Patent Application Laid-Open No. 60-261497. Abnormal vibration is detected and dehydration operation is stopped, and the drum is rotated forward and backward at a low speed, or the drum is rotated at a low speed continuously or intermittently depending on the load amount. Drive and then
An operation control method such as re-dehydration is employed.

[0003]

By the way, generally, the whirling amplitude of the drum and the outer tub surrounding the drum due to the cloth piece leaning, as shown by the curves Xd4, Xd6, Xd8 and Xd10 in FIG. Resonance point (vertical and horizontal directions,
It is large when passing through (around 150 rpm), small in the rated speed range (700 to 1100 rpm), and the amount of change is small. For this reason, the permissible value of the whirling amplitude due to abnormal vibration or the like due to the shift of the cloth piece is set at the whirling amplitude at the resonance point where the amplitude is largest.

[0004] Therefore, there is provided a vibration switch or the like for detecting a whirling amplitude due to abnormal vibration, and a conventional technique such as rotating the drum at a low speed during dehydration and then linearly increasing the rotation speed to a rated rotation speed region. There were the following issues.

[0005] (1) The whirling amplitude exceeding the permissible value, at a resonance point or in a rotational speed region exceeding the resonance point, in a state in which the laundry still contains a large amount of water and the amount of cloth leaning greatly appears. Since detection is often performed (vibration switch or the like is operated), the detection frequency increases, and the number of times of re-dehydration increases.

(2) In addition, the vibration switch or the like has a resonance point at which the centrifugal force due to the rotation of the drum exceeds 1 G (G: unit of gravity, the number of rotations of the drum exceeding 1 G: about 65 rpm), or a number of rotations higher than the resonance point. Since the operation is performed in the area (150 rpm or more), since the laundry is stuck to the inner peripheral surface of the drum as shown in FIG. 12, it takes time to loosen and release the laundry after the detection.

(3) Further, when the rotation speed at which the vibration switch or the like operates is in a rotation speed region beyond the resonance point, the transmission of vibration to the installed floor or the like becomes large, and the body may move.

(4) Although the amount of cloth piece leaning at the beginning of dehydration is small,
With an increase in the rotation speed, the cloth may move in one direction due to centrifugal force, and the amount of offset in the rated rotation speed region may be larger than in the initial stage of dehydration. In such a case, the whirling amplitude in the rated rotation speed region cannot be detected by the vibration switch or the like, and the vibration transmission force and noise to the installation floor or the like increase.

SUMMARY OF THE INVENTION It is an object of the present invention to reduce the number of times of re-dehydration due to a piece of cloth at the time of dehydration, to facilitate the loosening of laundry stuck to the inner peripheral surface of a drum, and to transmit vibration to an installation floor or the like. An object of the present invention is to provide a drum-type washing machine with reduced power and noise.

[0010]

SUMMARY OF THE INVENTION A drum type washing machine according to the present invention is provided with an amplitude detecting means (hereinafter referred to as an unloading means) provided on an outer frame for detecting an amplitude of an outer tub exceeding a preset value during dehydration. And a vibration detecting means (hereinafter, also referred to as a resonance frequency), which is configured in such a manner that the resonance point (hereinafter, also referred to as a resonance frequency) is slightly higher than the rated dehydration rotation speed of the drum and is installed in the outer tub. , Acceleration detection device)
And a control means for controlling the rotational movement of the drum by controlling a drive unit such as a variable speed motor based on the output signals of the amplitude detection means and the vibration detection means.

The amplitude detecting means (unbalance detecting device) installed on the outer frame and detecting the amplitude of the outer tank is provided when the amplitude of the outer tank itself exceeds a preset value irrespective of the rotational speed of the drum. Works. The configuration includes a pair of infrared light emitting elements and a light receiving element.

The vibration detecting means (acceleration detecting device) configured so that the resonance frequency is slightly higher than the rated dewatering rotation speed of the drum is shown in FIG. 7 as the rotation speed of the drum approaches the rated dehydration rotation speed. Xv4, Xv6, Xv8, Xv1
As shown by the zero curve, the operation is performed with the amplitude increased, and the operating rotation speed decreases as the cloth lean amount (imbalance amount) increases. Therefore, when the cloth piece shift amount is large, it is possible to reduce the steady dehydration rotation speed and suppress the increase in vibration and noise accompanying the rotation of the drum. This vibration detecting means has a structure in which a mover (mass) attached to the tip of a wire or plate-like spring is opposed to a stator.

[0013] The control means controls the dehydration operation as follows.

(1) Dehydration operation First, the centrifugal force due to the rotation of the drum is higher than the rotation speed (about 65 rpm) exceeding 1 G, and the resonance point at the start of dehydration (up and down and left and right directions, 15
0 rpm) range (preferably 12 rpm).
0 to 130 rpm), the drum is rotated for a certain period of time, and then the rotation speed of the drum is increased to the rated dehydration rotation speed region.

As a result, the rotational speed of the drum is about 120 to
At 130 rpm, a large amount of water contained in the laundry is removed to reduce the amount of imbalance due to the leaning of the cloth, and the rotational frequency of the operation is still before the resonance point. Can be reduced. In addition, since the sticking of the laundry to the inner peripheral surface of the drum is still soft, when the amplitude detection device is operated to perform the dehydration in (2), the laundry is easily loosened and released. The time required for re-dehydration can be shortened.

(2) When the amplitude detecting means (unbalance detecting device) is operated during the dehydrating operation, the power supply to the variable speed motor for driving the rotation of the drum is cut off. Rocking) to loosen and release the laundry stuck to the inner peripheral surface of the drum, and then the operation (1) is performed.

(3) When the amplitude detecting means repeats a predetermined number of operations during the dehydrating operation, the process shifts to the next step (rinse or end).

(4) When the vibration detecting means (acceleration detecting device) is operated during the spin-drying operation, the power supply to the variable speed motor is cut off and the drum is coasted for a preset time, and then the inside of the drum is rotated. Without performing the operation of loosening and releasing the laundry stuck on the peripheral surface, the variable speed motor is energized again to increase the rotation speed of the drum. When the vibration detecting means operates again, the above-described operation is repeated, and as a result, the intermittent dehydration operation is performed.

With this arrangement, when the cloth piece shift amount is large in the rotation region beyond the resonance point, the spinning speed becomes lower than the rated spinning speed. Can be suppressed.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 show an embodiment of a drum type washing machine according to the present invention. FIG. 1 is a sectional view of the drum type washing machine.
FIG. 2 is a block diagram of a control system, and FIG. 3 is a timing chart showing an example of an operation program.

In the figure, the outer tub 2 is buffer-supported (vibration-proof supported) by a vibration-proof spring 3 and a shock absorber 4, and is accommodated in the outer frame 1. In the outer tub 2, a drum 5 serving as a washing tub and a dewatering tub is horizontally supported by a bearing tube 2a, and a plurality of lifters 5a for stirring laundry (not shown) are provided inside. , And 4-6mm in diameter all around
A large number of small holes 5b functioning as dehydration holes are provided.

The lid 6 molded and formed of glass or the like
To prevent the washing water from flowing out of the outer tub 2, the bellows 7
During operation, the lid lock device 6a (shown in FIG. 2) composed of a solenoid or the like is actuated and closed.
The laundry is put in and out by opening and closing the lid 6. Bellows 7
Is formed of flexible rubber or the like, and connects the opening of the outer frame 1 and the opening of the outer tub 2 in a watertight and flexible manner.

At the time of washing and rinsing, the water supply solenoid valve 13 is used.
2 (shown in FIG. 2) is opened, water is supplied into the outer tub 2, and at the time of drainage and dehydration, the drainage electromagnetic valve 8 is opened to be drained. Outer tub 2
The water level inside is controlled by a water level detection device 14 (shown in FIG. 2).

The drum 5 is driven by a variable speed motor 9 (for example,
A commutator motor, an inverter motor, a direct current motor, or the like) is rotated through the belt transmission 10 and, for example, is reversed at about 50 rpm during washing and rinsing, and at about 120 to 130 rpm at the time of dehydration, followed by a rating. It is rotated at a spinning speed of 1000 rpm.

The unbalance detecting device 11, which is an amplitude detecting means, includes a pair of infrared light emitting elements and a light receiving element and is installed on the outer frame 1 as described later with reference to FIG. Then, when the whirling amplitude of the light-shielding piece 2b fixed on the outer tub 2 becomes a whirling amplitude exceeding a value Sp (shown in FIG. 4) set as an allowable amplitude due to the cloth piece deviation during the spin-drying operation. Operate. This allowable amplitude Sp is
This is a value that makes it difficult to start the dewatering operation or the like because the amount of cloth piece deviation is excessive and the whirling amplitude of the outer tub 2 is large.

The acceleration detecting device 12 as a vibration detecting means
As described later with reference to FIGS. 5 and 6, the movable member (mass m shown in FIG. 5) attached to the outer peripheral portion of the outer tub 2 that swings during dehydration and observed on the attached portion during the dehydrating operation. When the whirling amplitude of the mover 12g shown in FIG. 6 exceeds a value Sd (shown in FIG. 6) set as a permissible amplitude in advance (turns on).

The control device 15 is connected to a power supply circuit 16, a power supply frequency detection circuit 17, and a drive circuit 18, and has a series of operation programs of "washing, rinsing, and dehydrating" shown in FIG.
According to the water level information of the water level detecting device 14, information such as ON / OFF of the unbalance detecting device 11 and the acceleration detecting device 12, etc., the operation control of the variable speed motor 9, the opening / closing control of the water supply / drainage system, and FIGS. The dehydration operation control and the like of the present invention according to the flowchart shown in FIG.

FIG. 4 is a diagram showing a specific embodiment of the unbalance detecting device 11. The unbalance detection device 11 includes an infrared light emitting element 19 at a rising part 11b on one side of a frame 11a fixed to the outer frame 1, and an infrared light receiving element 20 at a rising part 11c on the other side, facing the infrared light emitting element 19. Each is configured to be attached. And
The detection of the amplitude exceeding the preset amplitude Sp is based on the fact that the light shielding piece 2b of the outer tank 2 arranged between the infrared light emitting element 19 and the infrared light receiving element 20 vibrates in the X and Y directions, and the light shielding piece 2b The infrared ray R emitted from the light emitting element 19 is shielded, the reception of the infrared light receiving element 20 is cut off, and the cutoff is performed by the conductor 19.
a, transmitted to the control device 15 through 20a, and turned off.
This is performed by processing as a signal.

FIGS. 5 and 6 show a specific embodiment of the acceleration detecting device 12. FIG. FIG. 5 is a diagram illustrating the principle of the acceleration detection device 12, and FIG. 6 is a diagram illustrating a specific configuration of the acceleration detection device 12.

A vibrometer S composed of a mass (weight) m, a spring k supporting the mass m and a damping element c (small value) shown in FIG. 5 is attached to a vibrating body D (outer tub 2 or the like). When the vibrating body D vibrates with the amplitude Xo in the mounted vibration system, the mass m
Also vibrate. At this time, the mass m observed on the vibrating body D
Is defined as Xn. Using this vibrometer S, a small amplitude Xo of the vibrating body D in the rated dehydration rotation speed region can be detected by capturing the amplitude Xn of the mass m that increases due to the resonance phenomenon.

An embodiment of the acceleration detecting device 12 embodied based on the principle of the vibration meter S will be described with reference to FIG.

FIG. 6 shows a specific embodiment of the acceleration detecting device 12 based on such a principle. The acceleration detecting device 12 includes a conductive stator 12 formed in a U-shape at a rising portion 12b on one side of a concave frame 12a.
d is a straight linear or plate-like spring 12g in which a movable element 12g, which is opposed to the rising portion 12c on the other side on the same line as the center of the bottom plate 12e of the stator 12d, is fixed to the distal end portion.
h are insulated from each other. The amplitude or acceleration is detected by vibrating the vibrating body D on which the acceleration detecting device 12 is mounted in the X and Y directions.
When the whirling amplitude in the Y direction of g exceeds the amplitude Sd set as the allowable whirling amplitude of the movable element 12g observed on the vibrating body D in a preset rated rotation speed region, the movable element 12g Contacts the side plate 12f of the stator 12d while whirling, and sends an "ON" signal due to the contact to the conductor 1
This is performed by transmitting to the control device 15 or the like through 2i and 12j.

FIGS. 7, 8, and 9 (FIGS. 8 and 9 are enlarged views of FIG. 7) show an outer tank 2 (a light shielding piece 2a portion and a mounting portion of the acceleration detecting device 12 and the like) as a vibrating body. Mass is m = 1.5
(g) An acceleration detection device designed with a spring constant of k = 0.24 (N / cm), a resonance frequency of 1200 rpm, and an allowable whirling amplitude of Sd = 0.50 (cm). 12 is an example showing the resonance characteristics of No. 12;

In FIG. 7, Xd4, Xd6, Xd8, Xd1
0 is the amplitude of the outer tank 2, Xv4, Xv6, Xv8, Xv10
Is the mover 1 of the acceleration detection device 12 observed on the outer tank 2
It is an amplitude of 2 g, and the known unbalance amounts u4 = 0.4 kg, u6 = 0.6 kg, u8 = attached to the inner surface of the drum 5
It corresponds to the vibration resonance characteristic of 0.8 kg, u10 = 1.0 kg (not shown).

FIG. 8 is a resonance characteristic curve diagram (an enlarged view of a part of FIG. 7) in a rotation speed region where the drum 5 is rotated at a low speed for a certain period of time at the beginning of the dehydration operation. In the figure, Nl represents the number of revolutions at which the drum 5 is rotated at a low speed for a certain period of time, which is preset to a value slightly lower than the resonance frequency (about 150 rpm of the spinning speed shown in the figure), and Sp is the outer Tank 2
Represents the permissible amplitude at which the unbalance detecting device 11 starts operating when the light shielding piece 2b vibrates in the X and Y directions.

According to FIG. 8, at the beginning of the spin-drying operation, the drum 5 is rotated at the rotation speed Nl for a certain period of time.
By removing a large amount of water contained in the laundry, for example, the unbalance amount u10 is reduced to u8, and the unbalance amount u is reduced.
By improving the resonance characteristic curve Xd10 corresponding to 10 to the resonance characteristic curve Xd8 corresponding to the unbalance amount u8, the maximum amplitude is made smaller than the allowable amplitude Sp described above, and the dewatering operation can be performed. In addition, the unbalance detection device 1
In the case where 1 operates to perform dehydration again, the rotation speed at the time of detection is still before the resonance point and is a low value.
The sticking of the laundry to the inner peripheral surface of the drum is soft, and the loosening and release are easy. Therefore, the operation of rotating the drum 5 at the rotation speed Nl for a certain period of time at the beginning of the dehydration operation reduces the frequency of the detection operation of the unbalance detection device 11 and the operation of the unbalance detection device 1.
This is an effective means for shortening the time required for re-dehydration and for realizing a quiet dehydration operation when re-dehydration is performed by operation of 1. In addition, the time for rotating the drum 5 at the rotation speed Nl is 5 times in order to remove a large amount of water contained in the laundry.
Min is effective, and practically 1 to 5 min is preferable.

FIG. 9 shows the mover 22g of the acceleration detecting device 12.
Sd = 0.5 (cm), the amplitude at which the amplitude of “ON” is turned on,
The allowable amplitude Sd and the unbalance amounts u4, u6, u8, u
10, the resonance curves Xv4, Xv6, Xv8, Xv10
And C4, C6, C8, and C10, the dehydration rotation speeds N4 = 1037 rpm and N6 =
964 rpm, N8 = 906 rpm, N10 = 858 rpm
Is the number of rotations at which the acceleration detection device 12 operates (“on”).

According to FIG. 9, the amplitude of the mover 12g of the acceleration detecting device 12 gradually increases as the spinning speed increases without being influenced by the change in the amplitude of the outer tub 2. In the rated rotation speed region for dehydration, the rate of increase in the amplitude increases due to the resonance phenomenon, and the amplitude of the mover 12g becomes larger than the amplitude of the outer tub 2 and comes into contact with the side plate 12f of the stator 12d. . When the cloth piece shift amount is large, the mover 12g comes into contact with the side plate 12f of the stator 12d in a region lower than the rated spinning speed Ns. Therefore, the acceleration detecting device 12 that operates in the rated rotation speed region by using the resonance phenomenon functions as a rotation speed detection unit in consideration of the unbalance amount, and when the unbalance amount is large, This is advantageous for realizing a control method for performing a spin-drying operation at a lower rotation speed.

The operation of the variable speed motor 9 for driving the drum 5 is controlled by the drum-type washing machine having the above configuration under the following conditions in order to reduce vibration and noise during dehydration.

(1) Dehydration operation At first, the rotation speed Nl (120 to 120 rpm) where the centrifugal force due to the rotation of the drum 5 is higher than the rotation speed (about 65 rpm) exceeding 1 G and lower than the resonance point (about 150 rpm) at the start of dehydration. At a speed of 130 rpm, the drum 5 is rotated for a predetermined time (1 to 5 min), and then the rotation speed is increased to the rated dehydration rotation speed region.

(2) When the unbalance detecting device 11 is operated during the spin-drying operation, the power supply to the variable speed motor 9 is stopped, and then the drum 5 is reversed (or swung) to rotate. The laundry stuck on the inner surface of 5 is unraveled.
Release, and then the operation of (1) is performed.

(3) When the unbalance detecting device 11 repeats a predetermined number of operations during the dehydration operation, the process proceeds to the next step (rinse or end).

(4) When the acceleration detecting device 11 operates during the spin-drying operation, the power supply to the variable speed motor 9 is stopped, and the drum 5 is coasted for a preset time. Without rotating or releasing the laundry stuck to the surface, the variable speed motor 9 is energized again to increase the rotation speed of the drum 5. When the unbalance detection device 11 operates again, the operation is repeated,
Dehydration operation is performed intermittently.

Next, control of the washing, rinsing and dehydrating operations by the control device 15 for controlling the operation of the variable speed motor 9 will be described.

In the washing and rinsing operation, the control device 15 detects the power supply frequency by the power supply frequency detection circuit 17, determines the power supply frequency, and then drives the drum 5, which is set in advance and input to the control device 15. The energization control according to the operation program of FIG. 3 and the energization program “ON (forward rotation) -OFF (OFF) -ON (reverse rotation) -OFF (OFF)-...

In the dehydration operation, the power supply is controlled according to the operation program shown in FIG. 3 and the flowcharts shown in FIGS.

When the dehydration operation in the operation program shown in FIG. 3 is instructed, the control device 15 first detects and determines the power supply frequency by the power supply frequency detection circuit 11 in step S1 in FIG. Then, in step S2, the operation time of each process and the control program of the dehydration operation, which are set in advance and input to the control device 15, are selected, and the number Nb of times of operation of the unbalance detection device 11 is set to "0". Make initial settings such as Then, in step S3, it is determined whether the unbalance detection device 11 (shown as unbalance SW) is on or off. For a set period of time (1 to 5 min), the resonance point (150
rotation speed Nl (120-130 rpm)
To determine whether the rotation of the drum 5 is within the low-speed rotation dehydration time. As a result, if it is within the time, in step S5,
Electric power is supplied to the variable speed motor 9 to rotate the drum 5 at low speed. Then, the process proceeds to step S12 (FIG. 11) to check whether the acceleration detection device 12 is on or off. The result is “off”, and the drum 5 is rotated at the rated dehydration rotation speed according to the determination in step S13. Within the dehydration time by the rated speed "
If not, the process returns to step S3.

The dehydration operation control (dehydration operation control at a low rotational speed) by this loop is performed for a predetermined time (1 to 5 minutes) in step S2, and thereafter, in step S1.
1 (FIG. 11).

On the other hand, if the unbalance detecting device 11 is turned off, the process proceeds to step S6, in which the power supply to the variable speed motor 9 is cut off for a predetermined Tw time, and the drum 5 Is stopped, and in step S7, the elapsed time of dehydration is returned to "0". Thereafter, in step S8, "1" is added to the number of "OFF" detections Nb of the unbalance detection device 11, and in step S9, the number is determined. If the number of detections Nb is equal to or less than the number of times b set and input in advance, in step S10, the drum 5
Is reversed and the laundry is agitated (cloth piece leaning correction operation),
Thereafter, returning to step S3, the dehydration operation control (low-speed rotation dehydration operation control) starting from step S3 is performed. If the number of detections Nb exceeds b in the determination in step S9, the process proceeds to step S17, which is the next step of the dehydration operation, and “rinse” or “end” operation control is performed.

When the dehydration start-up operation in FIG. 10 is completed, a dehydration operation at the rated speed shown in FIG. 11 is instructed. Then, in step S11, it is confirmed whether "within the dehydration time based on the rated rotation speed", and in step S12, the on / off information signal of the acceleration detecting device 12 is determined. If "off", the process proceeds to step S13. S14
By energizing the variable speed motor 9, the drum 5
At high speed at the rated speed.

The dehydration operation control (dehydration operation control based on the rated rotation speed) in the loop from step S3 to step S14 is performed unless the unbalance detector 11 is turned off or the acceleration detector 12 is turned on during operation. , Step S2
Is performed for a preset time, and then, in step S
After step 11, the process proceeds to “rinse” or “end”, which is the next step (step 17) of the dehydration operation.

On the other hand, when the acceleration detecting device 12 is turned "ON" during the dehydration elapsed time Tr due to a large amount of leaning of the cloth, etc., the variable speed motor 9 is switched to the variable speed motor 9 for a predetermined Tws time in step S15. And the drum 5 is coasted. Thereafter, in step S16, the elapsed time of dehydration is replaced with (Tr + Tws), and the process returns to step S3 to restart the subsequent dehydration operation control.

According to the drum type washing machine of the present invention as described above, the drum type washing machine is installed on the outer frame 1 in order to detect the whirling amplitude of the outer tub 2 exceeding a preset value Sp during dehydration. An unbalance detector 11 and an amplitude S set at the outer periphery of the outer tank 2 and set as an allowable amplitude of itself.
An acceleration detection device 12 for detecting an amplitude exceeding d, and a control device 15 for controlling rotation of the variable speed motor 9 and the drum 5 based on output signals of the unbalance detection device 11 and the acceleration detection device 12 are provided. Thereby, the drum 5 is rotated at a low speed for a certain time at the start of the dewatering operation, and when the debris leaning amount is large and dehydration start is difficult, the leaning of the cloth can be surely corrected. Since the upper limit of the steady dehydration rotation speed can be reduced according to the magnitude of the cloth leaning amount, vibration and noise during the dehydration operation can be reduced.

[0055]

According to the present invention, at the start of the spin-drying operation, the drum is rotated at a low speed to detect the whirling amplitude of the outer tub exceeding the allowable amplitude Sp. By controlling the power supply to the variable-speed motor based on the vibration detection with the acceleration detecting means for detecting the whirling amplitude of the outer tub exceeding Sd, it is easy to correct the leaning of the cloth at the start of the dehydration operation. In addition to being able to reliably perform in a short period of time, it is also possible to detect an amplitude exceeding the set allowable amplitude and unexpected abnormal vibration even in a steady state where the drum is rotating at a high speed. Thus, a drum-type washing machine capable of controlling the vibration transmitting force and noise to a small amount can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a drum-type washing machine according to the present invention.

FIG. 2 is a block diagram of a control system in the drum type washing machine according to the present invention.

FIG. 3 is a timing chart showing an example of an operation program in the drum type washing machine according to the present invention.

FIG. 4 is an explanatory diagram of an unbalance detection device in the drum type washing machine according to the present invention.

FIG. 5 is an explanatory view of the principle of an acceleration detecting device in the drum type washing machine according to the present invention.

FIG. 6 is an explanatory diagram of an acceleration detection device in the drum type washing machine according to the present invention.

FIG. 7 is a characteristic diagram of the resonance of the outer tub and the mover of the acceleration detecting device in the drum type washing machine according to the present invention.

8 is a resonance characteristic diagram of the outer tank shown in FIG.

9 is a resonance characteristic diagram of the acceleration detection device shown in FIG.

FIG. 10 is a flowchart showing an example of dehydration start operation control in the drum type washing machine according to the present invention.

FIG. 11 is a flowchart illustrating an example of dehydration steady operation control in the drum type washing machine according to the present invention.

FIG. 12 is an explanatory view showing a state in which laundry is stuck to the inner peripheral surface of the drum.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Outer frame, 2 ... Outer tank, 5 ... Drum, 6 ... Cover, 7 ... Bellows, 9 ... Variable speed motor, 10 ... Belt transmission device, 11
... Unbalance detector, 12 ... Acceleration detector, 15
... Control device, 16 ... Power supply circuit.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Masahiko Nagaoka 1-1-1, Higashitaga-cho, Hitachi City, Ibaraki Prefecture Inside the Taga Headquarters, Hitachi, Ltd.Electrical Equipment Division (72) Inventor Hideyuki Kimura Shinchi, Tsuchiura City, Ibaraki Prefecture 502, Machi, Machinery Research Laboratory, Hitachi, Ltd.

Claims (5)

[Claims] 1. A drum which has an outer frame and a rotating shaft in a substantially horizontal direction and is driven to rotate also as a washing tub and a dehydration tub, an outer tub containing the drum, and the outer tub being connected to the outer frame. A drum-type washing machine having an anti-vibration device that supports vibration-proofing, wherein at the time of dehydration, in order to detect the amplitude of the outer tub exceeding a preset value, an amplitude detecting means installed on the outer frame; Is configured to be a slightly higher value than the rated dehydration rotation speed of the drum and installed in the outer tub vibration detection means,
By controlling the drive unit of the variable speed motor based on the output signals of the amplitude detection unit and the vibration detection unit,
Control means for controlling the rotational movement of the drum, wherein the centrifugal force due to the rotation of the drum is 1 at the beginning of the spin-drying operation.
A drum-type washing machine characterized in that the drum is rotated for a certain period of time in a rotation speed range higher than G and lower than a resonance point at the time of starting dehydration. 2. The method according to claim 1, wherein when the amplitude detecting means is operated during the spin-drying operation, the power supply to the variable speed type motor for rotating the drum is cut off, and then the drum is reversed. A drum type washing machine in which the laundry stuck to the inner peripheral surface of the drum is loosened and released, and the operation is performed again. 3. A drum-type washing machine according to claim 2, wherein when the amplitude detecting means repeats a predetermined number of operations during the dehydrating operation, the operation is shifted to rinsing or ending. 4. The method according to claim 1, wherein when the vibration detecting means operates during the spin-drying operation, the power supply to the variable speed motor is cut off, and the drum is coast-rotated for a preset time. A drum type washing machine in which the variable speed motor is energized to increase the number of revolutions of the drum, and when the vibration detecting means is operated again, the above operation is repeated, and intermittent dehydration operation is performed. 5. The drum type washing machine according to claim 4, wherein when the vibration detecting means repeats a predetermined number of operations during the spin-drying operation, the operation is shifted to rinsing or ending.