JP2895947B2 - Washing machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a washing machine that rotates a washing tub disposed in an outer tub to execute a washing step, a rinsing step, and a dehydrating step.

(Prior art)

In a conventional washing machine, an outer tub is supported in a frame, and a drum made of a synthetic resin, which is a horizontal axis type washing tub, is rotatably or rotatably supported in the outer tub. There is a drum type washing machine in which a washing process and a rinsing process including an intermediate dehydrating operation are performed by reciprocating rotation to perform a dehydrating process by rotating the drum at a high speed.

In such a washing machine, when performing a dehydration operation, first,
Control for performing a loosening operation of rotating the drum continuously or intermittently at a low speed for a predetermined time in order to find out the balance of clothes in the drum for a predetermined time, and then gradually increasing the rotation speed of the drum to perform a dehydrating operation of a predetermined intensity During the dehydration operation, it is detected whether or not the drum has abnormal vibration.If the abnormal vibration of the drum is detected due to the eccentricity of clothes in the drum, the drum is stopped to eliminate the eccentricity. There is an apparatus which performs control to execute a loosening operation and a dehydration operation again (Japanese Patent Publication No. 63-25797). In such a washing machine, the rinsing step including the intermediate dehydrating operation includes, for example, a first loosening operation → a first dehydrating operation → a first rinsing operation → a second loosening operation → a second dehydrating operation. → As in the second rinsing operation, the loosening operation, the dehydrating operation and the rinsing operation are repeated a plurality of times.

[Problems to be solved by the invention]

However, in a washing machine that performs control to re-execute the loosening operation and the dehydrating operation when abnormal vibration of the drum is detected as described above, for example, when clothes are difficult to loosen, such as when the amount of clothes in the drum is large. If the abnormal vibration is detected in the first dehydrating operation, the abnormal vibration may be detected also in the subsequent dehydrating operation, so that the loosening operation cannot be reliably performed and stable dehydration cannot be performed. There was a drawback.

The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a washing machine capable of reliably performing a loosening operation in a loosening operation and performing a stable dehydrating operation.

[Means for solving the problem]

A washing machine according to the present invention includes an outer tub, a washing tub rotating inside the outer tub, and a unit for detecting abnormal vibration of the washing tub, and sequentially performs a washing process, a loosening operation, a dehydrating operation, and a rinsing operation. A rinsing step to be performed and a dehydrating step of sequentially performing a loosening operation and a dehydrating operation are sequentially performed. If the abnormal vibration is detected during the dehydrating operation in the rinsing step and the dehydrating step, the dehydrating operation is stopped and again performed. In the washing machine in which the loosening operation and the dewatering operation are performed, if abnormal vibration is detected during the dewatering operation in the rinsing step and the dewatering step, the time of the loosening operation performed thereafter is set to the time of the previous loosening operation. It is characterized in that the operation time is longer than the operation time.

[Action]

If abnormal vibration is detected during the dehydrating operation in the rinsing step and the dehydrating step, the laundry that is difficult to unravel in the specified time is in the washing tub. In such a case, if the time of the loosening operation performed after the dehydrating operation in which the abnormal vibration is detected is the same as the time of the previous loosening operation, during the dehydrating operation performed after the dehydrating operation in which the abnormal vibration is detected. Although abnormal vibration may be detected again during the dehydrating operation, if abnormal vibration is detected during the dehydrating operation, the time of the loosening operation performed before the subsequent dehydrating operation is the time of the previous loosening operation Since the time is longer than the above, sufficient loosening can be performed and abnormal vibration during the dehydrating operation can be suppressed, so that in the rinsing step and the dehydrating step, during the dehydrating operation performed after the dehydrating operation in which the abnormal vibration is detected Abnormal vibrations can be suppressed.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the drawings showing the embodiments.

FIG. 1 is a schematic perspective view of a washing machine according to the present invention.
In the drawing, reference numeral 1 denotes a bottomed prismatic sheet-metal frame. The front edge of the upper surface of the frame 1 is a synthetic resin upper surface plate that accommodates devices such as electronic components and has a keyboard 11 on the upper surface of which various operation keys are provided. A housing 9b, which is a synthetic resin top plate for housing equipment such as a water supply device, is formed by expanding a portion 9a at the rear edge of the upper surface of the frame 1, respectively. In addition, a rectangular upper clothing input port 10a is opened between the operation unit 9a and the accommodation unit 9b on the upper surface of the frame 1, and the upper clothing input port 10a is moved in a direction indicated by a white arrow in the figure. A synthetic resin upper cover 14 that opens and closes is provided. An outer tub 2 which is a water tank made of a synthetic resin formed in the shape of a horizontal axis drum is disposed inside the frame 1, and a horizontal axis type drum made of a synthetic resin which is a washing tub is provided in the outer tub 2. 3 is disposed coaxially with the outer tub 2 so as to be rotatable and rotatable.

FIG. 2 is a longitudinal sectional view of the outside of the outer tub 2 of the washing machine according to the present invention as viewed from the front. The outer tank 2 has a flat shape at its bottom 2c, its side 2b is curved outward, its upper part 2a has a horizontal drum shape protruding upward in the shape of a rectangular tube, and its upper part 2a has An intermediate clothing slot 10b is opened. The upper garment inlet 10a and the middle garment inlet 10b are watertightly connected by a rubber packing 12. Also,
At the lower part of the side parts 2b, 2b of the outer tub 2, horizontal support parts 20, 20 having a flat bottom surface are formed so as to protrude.
Iron mounting plates 29, 29 are fixed to the bottom surface of 0,20. In the frame 1, the upper portions of the side portions 2b of the outer tub 2 are elastically suspended and supported from the upper four corners of the frame 1 by upper supports 5, 5,. On the other hand, the lower portion of the outer tub 2 has a lower support 6, which is made of an elastic member disposed between the mounting plates 29, 29 and the bottom of the frame 1.
Supported by 6 ... Further, the upper support 5,5
In the vicinity of one of ..., in conjunction with the vibration of the upper support 5,
A large vibration of the upper support 5 is regarded as a vibration of the drum 3, and an abnormal vibration switch 102 including a micro switch which is turned on and off by the vibration is provided. The ON / OFF signal of the abnormal vibration switch 102 is provided to a first microcomputer 100 described later. The first microcomputer 100 outputs a signal when the interval of the OFF time of the signal is longer than a predetermined time. Drum 3
A process is performed in which the vibration is regarded as abnormal vibration.

At the center of the front wall of the outer tub 2, a heater casing 40 having a substantially teardrop shape in a front view is disposed. Heater casing
In the heater casing 40, three mounting brackets 41, 41, 41 are inserted into the inside of the heater casing 40 from outside thereof.
The drying heater 4 having a heating element formed in a horseshoe shape along the side wall of the heater 40 is fixed in the heater casing 40 by these mounting brackets 41, 41, 41. A circulation duct 21 that extends upward and communicates with the inside of the outer tub 2 through a circulation port (not shown) that opens in the front wall of the outer tub 2 is integrally formed on the left side of the heater casing 40 when viewed from the front. . A blower fan 22 is provided above the circulation duct 21.
A connection pipe 42 is provided between the upper part of the heater and the heater casing 40, and the inside of the circulation duct 21 and the inside of the heater casing 40 communicate with each other via the connection pipe 42.

On the right side of the heater casing 40 when viewed from the front, there is provided an overflow chamber 23 for drawing out overflow from an overflow port (not shown) opened at a height of 1/2 of the front wall. ,
An overflow hose 230 for draining the overflow in the overflow chamber 23 is connected to the bottom of the overflow chamber 23. An air trap for detecting a water level in the outer tub 2 is provided at a lower portion outside the front wall of the outer tub 2.
24 are integrally formed. This air trap 24 is connected via a pressure hose 26 to a water level detector 25 arranged near the operation section 9a. The water level detector 25 detects a change in the water level in the outer tub 2 as a pressure change in the air trap 24, and moves the magnetic body in the coil according to the pressure change. As a result, the water level change indicates the inductance of the coil. This is detected as a change.

At the bottom of the outer tub 2, there is provided a drain port 71 having a drain port (not shown) for draining water in the outer tank 2, and the drain port 71 is provided with drainage from the drain port 71. Is connected to a drain hose 72 for leading the air out of the machine. This drain hose
The overflow chamber 23 is connected to the overflow chamber 23 through an overflow hose 230.
Is drawn out of the aircraft. A drainage motorized valve 73 for opening and closing the drainage port of the drainage port 71 is provided between the drainage port 71 and the drainage hose 72, and is disposed below the outer tub 2 as is well known. The valve is opened by winding the wire with the rotational force of the drain motor 79,
By cutting off the rotational force, the valve returns to the closed state by the urging force of a spring (not shown).

In addition, a double water supply solenoid valve 8 is provided in the housing portion 9b (see FIG. 1). This water supply solenoid valve 8 has a first water supply hose having one end connected to the side wall of the upper portion 2a of the outer tub 2.
A second water supply hose (not shown), one end of which is connected to the front wall of the upper portion 2a of the outer tub 2 is connected to 26. The water supplied from the water supply electromagnetic valve 8 is supplied into the outer tub 2 via the first water supply hose 26 and the second water supply hose, and travels along the inner wall of the outer tub 2 to reach the drain port 71.

FIG. 3 is a longitudinal sectional view of the inside of the drum 3 of the washing machine according to the present invention as viewed from the front, and FIG. 4 is a longitudinal sectional view of the inside of the drum 3 as seen from the side.

The drum 3 includes a cylindrical body 31 having a horizontal axis and a bottom and a cylindrical body.
An outer tub is constituted by a fluid fluid balancer 32 attached to the opening surface of the washing machine 31 and a front plate 33 fixed to the outside of the fluid balancer 32, with the front plate 33 facing the front of the washing machine. 2
It is arranged in. At the center of the front plate 33, a suction port portion 34 formed by forming an axial flow fan also serving as a filter for sucking dry air is formed so as to protrude. This suction port 34
One end of a support shaft 35 serving as a rotary shaft on the front side of the drum 3 is fixed to the center of the drum 3. On the other hand, at the center of the end surface of the body 31 on the opposite side to which the front plate 33 is fixed, A support shaft 36 provided on the same axis as the support shaft 35 and serving as the other rotation shaft of the drum 3.
Is fixed at one end. The other end of the support shaft 35 is connected to a front bearing 350 disposed at the center of the heater casing 40.
The other end of the support shaft 36 is supported by a rear bearing 360 disposed at the center of the rear wall of the outer tub 2, and the drum 3 is supported by the support shaft 35 and the support shaft 36. It is rotatable and rotatable around.

On the inner peripheral surface of the body 31 of the drum 3, baffles 31 a, 31 b, 31 having a triangular cross section formed to bulge toward the axis of the body 31.
c are arranged in three equal parts, and the baffles 31a, 31b, 31c are configured to scrape clothes in the drum 3 when the drum 3 rotates and rotates. On the inner peripheral surface and the outer peripheral surface of the trunk portion 31 of the drum 3, lateral ribs 301 extending in the axial direction of the drum 3 are provided.
Are formed in a large number. Further, a large number of through holes 302, 302,...
The supply and discharge of water to and from the inside of the drum 3 are performed via the.

Further, a recess 31d formed by reducing the diameter of an arc portion having a central angle of 120 degrees in the body 31 is provided on the outer periphery of the body 31. The bottom of the recess 31d is formed at the bottom of the recess 31d. The lower clothing slot 10c, which has a rectangular shape in plan view and occupies approximately half the area of
Has been established. On the leading edge and trailing edge of the recess 31d,
Sliding grooves 390, 390 for slidably mounting a synthetic resin lid 38 for opening and closing the lower clothing inlet 10c extend in the circumferential direction. The slide grooves 390, 390 are formed by attaching strip-shaped slide covers 392, 392 to the upper portions of the ridges 391, 391 provided in the circumferential direction of the body portion 31, respectively. The lid body 38
Are supported in the slide grooves 390, 390 and slide grooves 390, 3
The lower clothing input port 10c is opened and closed by sliding inside 90. A disengagement mechanism for locking and releasing the lid 38 when the lower clothing input port 10c is closed by the lid 38 between one side edge of the lid 38 and the edge of the lower clothing input port 10c. 37 are provided. In addition, a storage 380 for storing a washing process such as a detergent, a bleaching agent and a softening agent is provided in a central portion of the upper surface of the lid 38 in advance.

As described above, the drum 3 is supported by the front bearing 350 and the rear bearing 360 by the support shaft 35 and the support shaft 36.
The shaft end of the rear bearing 360 projects outward from the rear wall of the outer tub 2, and a drive pulley 74 is attached to the shaft end. A motor 75, which is a three-phase induction motor, which is a power source of the drum 3, is provided outside the bottom surface of the outer tub 2.
The drive shaft of the motor 75 and the drive pulley 74
Are connected via A magnet 77 is mounted on the outer tub 2 side of the drive pulley 74, and a reed switch 78 is disposed at a position facing the magnet 77 on the outer surface of the rear wall of the outer tub 2. Is the drive pulley 74
With the rotation of, the magnet 77 closes when the magnet approaches, and opens when the magnet 77 separates. That is, if the reed switch 78 is opened and closed once, the drum 3 has rotated once.

Further, a drum temperature detector 43 composed of a thermistor for detecting the temperature of the drum 3 by detecting the temperature of the mounting bracket 41 is mounted on any one of the mounting brackets 41, 41, 41. Further, a heater 27 having a heating element mounted parallel to the bottom surface is fixed to the bottom of the outer tub 2 by a heater mounting bracket 270 for the heater.
The water heater 27 is used when washing with hot water, and warms the water in the outer tub 2. A water temperature detector 28 that detects the temperature of the water in the outer tub 2 by detecting the temperature of the heater mounting bracket 270 is attached to the heater mounting bracket 270.

FIG. 5 is a plan view of the keyboard 11 of the operation unit 9a. In the figure, reference numeral 117 denotes a reservation key group composed of a plurality of keys operated to make a driving reservation for starting driving at a predetermined time, and behind the reservation key group 117, a reservation time and a keyboard 11 Display screen 11 that displays errors in input information and control malfunctions during operation as error messages
8 are provided.

Further, on the right side of the reservation key group 117, a water temperature setting key 111a for setting a water temperature (water temperature value, 35 ° C., 45 ° C.) in the outer tub 2, a washing process time (5 minutes, 10 minutes, 15 minutes) , A rinse time setting key 111b for setting the number of rinses (two, three, five times), a dehydration force setting key 111d for setting the dehydration power (strong, medium, weak), and drying The heater output setting keys 111e for setting the output (strong, medium, weak) of the heater 4 are arranged in a row. A washing course setting key 113a for setting a washing course (standard, wool,...) Corresponding to the type of clothing and the like and a finished state of drying are set at a position on the right side of the heater output setting key 111e at an appropriate distance. The drying course setting keys 113b are arranged in a row.

Further, the water temperature setting key 111a, the washing time setting key 111b,
Information selected by these keys is displayed after the keys of the rinsing number setting key 111c, the dehydration power setting key 111d, the heater output setting key 111e, the washing course setting key 113a, and the drying course setting key 113b. Water temperature setting display LED group 112a consisting of multiple LEDs, washing time setting display LED group 112
b Rinsing number setting display LED group 112c, dehydration power setting display LED group 11
2d, heater output setting display LED group 112e, washing course setting display L
An ED group 114a and a drying course setting display LED group 114b are provided respectively.

The respective keys of the water temperature setting key 111a, the washing time setting key 111b, the rinsing number setting key 111c, the dehydration force setting key 111d, the heater output setting key 111e, the washing course setting key 113a, and the drying course setting key 113b are operated once. Each setting can be changed every time, and the lighting display of each LED group is changed accordingly. In particular, the water temperature setting key 111a,
When the washing time setting key 111b, the number of rinsing times setting key 111c, the dehydrating power setting key 111d, and the heater output setting key 111e are operated a predetermined number of times, the execution of each step can be omitted.

Further, on the right side of the drying course setting display group LED 114b, a favorite course start key 115a which is a key for starting a washing course according to the user's preference, and a key for starting a predetermined standard washing course. A standard course start key 115b, a stop key 115c for stopping the operation of the washing machine, and a lid opening key 115d for opening the upper lid 14 are arranged in a row. In front of each of these keys, a preferred course start key receivable display LED 116a, a standard course start key receivable display LED 116b, and a stop key receivable display LED 116c, which light up and display the receivable state of the operation of these keys. And a lid open key acceptable display LED 116d are provided.

These favorite course start key 115a, standard course start key 115b, stop key 115c, and lid open key 11
In the case of 5d, the key operation is enabled only when the corresponding reception indicator LED is lit.

By operating these keys, the user can drive the vehicle according to his / her preference.
For example, when performing a predetermined standard operation, the standard course start key 115b is operated to start the operation, and when performing other operations, a desired washing course is set by operating the various keys as described above. Then, the operation is started by operating the favorite course start key 115a.

Next, the configuration of the control system of the washing machine according to the present invention will be described. FIG. 6 is a schematic block diagram showing a configuration of a control system of the washing machine.

In the figure, reference numeral 100 denotes a first microcomputer for performing main control of the washing machine, and reference numeral 200 denotes a second microcomputer for mainly performing inverter control of the motor 75. The first microcomputer 100 and the second microcomputer 200 are connected by a communication line, and information communication can be performed between the first microcomputer 100 and the second microcomputer 200 via the communication line.

The first microcomputer 100 includes an input key circuit 101 including various operation keys as described above, the water level detector 25, the drum temperature detector 43, the water temperature detector 28, the abnormal vibration switch 102, and the upper lid. A signal is input from the upper lid switch 103 which opens and closes in conjunction with the opening and closing of 14. The first microcomputer 100 includes a first drive circuit 105 and a second drive circuit 107 which are circuits for driving a plurality of devices, respectively.
Are connected, and a control signal for driving the device is supplied to them based on the signal input as described above. The first microcomputer 100 includes:
The LED display circuit 104 composed of each LED as described above is connected, and the LED display circuit
Information for LED display, such as information on the setting of the washing course and information on the operation status of the washing machine, is given to 104. The first drive circuit 105 includes a power-off AC solenoid 106, a drain motor 7
9 and the blower fan 22 are connected, and the first drive circuit 105 supplies respective drive signals to them. The second drive circuit 107 includes a water supply electromagnetic valve 8, an auxiliary agent input valve 108 for inputting an auxiliary agent such as a softener into the outer tub 2, an upper lid unlocking solenoid 109 for unlocking the upper lid 14, a water heater 27, The drying heaters 4 are connected, and the respective drive signals are supplied from the second drive circuit 107 to these heaters.

The second microcomputer 200 is connected to an inverter drive circuit 110 for driving the motor 75 by an inverter and a reed switch 78. Second microcomputer 20
To 0, a signal related to the rotation of the drum 3 is given from the reed switch 78. Then, the second microcomputer 20
From 0, a control signal for controlling the rotation of the motor 75 is supplied to the inverter drive circuit 110. In addition, the inverter drive circuit 110 supplies drive signals for forward / reverse rotation control and rotation speed control to the motor 75 connected thereto based on the control signal given from the second microcomputer 200.

The first microcomputer 100 is supplied with power for its operation from a first power supply circuit 111, and is provided between the first power supply circuit 111 and the first microcomputer 100 separately from the power supply line. Reset circuit 113 for initializing the first microcomputer 100 when the power is turned on
And 50H of the frequency of the power supplied from the first power supply circuit 111
A frequency synchronizing circuit 115 for judging Z and 60HZ and causing the first microcomputer 100 to perform an operation synchronized with the frequency of the judgment result is connected in parallel. Also, the second
The microcomputer 200 is supplied with power for its operation from the second power supply circuit 112, and a power supply is provided between the second power supply circuit 112 and the second microcomputer 200 separately from the power supply line. A reset circuit 114 for initializing the second microcomputer 200 when turned on is connected.

The above-described first drive circuit 105 and the devices driven by it, the second drive circuit 107 and the devices driven by it, the inverter drive circuit 110, the first power supply circuit 111, and the second power supply circuit 112 Power is supplied. A power supply switch 116 is provided in a power supply path from the AC power supply 300. When the power supply switch 116 is turned on, power is supplied to the control system as described above, and the washing machine becomes operable. It has become.

In the washing machine configured as described above, under the control of the first microcomputer 100 and the second microcomputer 200, a washing course including a washing step, a rinsing step, a dehydrating step, and a drying step is normally sequentially executed. On the other hand, each step can be selectively performed. In the rinsing step, after draining, the drum 3 is rotated forward and backward at a low speed and stopped at a predetermined cycle to thereby make the drum 3
After the loosening operation, the rotation speed of the drum 3 is increased to a predetermined rotation speed to perform a dehydration operation, and then the outer tub 2 is supplied with water to perform a rinsing operation. Do. That is, the rinsing step is, for example,
First loosening operation → first dehydrating operation → water supply processing → first rinsing operation → drainage processing → second loosening operation → second dehydrating operation → water supply processing → second rinsing operation → drainage processing, etc. It is configured such that a loosening operation, a dehydrating operation and a rinsing operation are repeated a plurality of times. In the dehydration step, the loosening operation and the subsequent dehydration operation are performed as described above.

Such a washing machine is operated by performing the following operation.

After the power is turned on, when the standard course start key 115b is operated (pressed) on the keyboard 111, each LED is turned on.
Then, a display indicating information on the standard washing course (standard setting information such as the set time and the number of operations of each process) is made, and the operation of the standard washing course is started. When the operation other than the standard washing course is performed, first, the water temperature setting key 111a, the washing time setting key 111b, the rinsing number setting key 111c, the dehydration power setting key 111d, the heater output setting key 111e, and the washing course setting key 113a By operating the drying course setting key 113b, the process to be executed is selected, and the setting time and the number of operations of the selected process are set. Then, when the favorite course start key 115a is pressed, only the selected steps are sequentially executed.

When the operation is started, in the washing step, first, water is supplied to the outer tub 2 to the set water level, and at the same time, the electric heater 27 is energized, and the washing water reaches the set water temperature set by operating the water temperature setting key 111a. Heat. Next, the motor 75
Is reciprocated in an operation cycle of, for example, 9 seconds on and 3 seconds off, and this is repeated within a set time. As a result, the drum 3 reciprocates and the clothes are baffled 31a, 31b, 31 in the drum 3.
A so-called tapping washing is performed in which the tank is lifted up by c. Further, at the same time when the motor 75 is turned off,
The DC braking is applied to the motor 75 for a second. As a result, the drum 3 suddenly stops.
The washing is performed by hitting the inner wall.

In the rinsing operation during the rinsing step, the same control of the motor 75 as in the rinsing step is performed, and the rinsing is performed.

In the rinsing step and the dewatering step, the above-described loosening operation and the dewatering operation are performed, but the water level of the outer tub 2 indicates a low set water level at which the rotation of the drum 3 for the predetermined dewatering becomes possible by drainage. When the reset water level is reached, the motor
The rotation speed of 75 is increased by control as described later, and the above-described loosening operation and dehydration operation are performed. Thereby, the clothes in the drum 3 are loosened and dehydrated by centrifugal force.

In the drying step, the motor 75 is rotated in one direction, and the drying heater 4 is energized, so that warm air is blown into the drum 3 by the blowing fan 22 and the axial flow fan. Is dried.

Next, a control method of the washing machine configured as described above will be described. FIG. 7 is a flowchart showing a main routine of operation control from the washing step to the dehydrating step.

In the main routine, first, water is supplied into the outer tub 2 in the water supply process in step 1, and when the water supply is completed, the process proceeds to the washing process in step 2, in which the drum 3 is rotated at a low speed to perform washing. When the washing process is completed, the process proceeds to the drainage process of step 3, and the water in the outer tub 2 is drained.

When the water in the outer tub 2 is drained, a rinsing step is performed.
In the rinsing step, first, the process proceeds to the dehydration processing subroutine of Step 4, executes a dehydration processing subroutine as described later, and executes the first loosening operation and the first dehydration operation.

When the dehydration processing subroutine ends, step 5
When the water supply is completed, the process proceeds to a first rinsing process of step 6, in which the drum 3 is rotated at a low speed to perform a first rinsing operation. When the first rinsing process is completed, the process proceeds to the drainage process of step 7 and the outer tank 2
Drain the water.

When the water in the outer tub 2 is drained, the process proceeds to a dehydration processing subroutine of Step 8, executes a dehydration processing subroutine described later, and performs a second loosening operation and a second dehydration operation. When the dewatering process subroutine of step 8 is completed, the process proceeds to the water supply process of step 9 and water is supplied into the outer tub 2. When the water supply is completed, the process proceeds to the second rinsing process of step 10 and the drum 3
Is rotated at a low speed to perform a second rinsing operation. When the second rinsing process is completed, the process proceeds to the drainage process in step 11, where the water in the outer tub 2 is drained, and the rinsing process is completed. When the water in the outer tub 2 is drained, a dehydration step is started. In the dehydration step, the process proceeds to the dehydration processing subroutine of Step 12, and executes the dehydration processing subroutine described later, thereby performing the final loosening operation and dehydration operation. The dehydration step ends.

FIG. 8 is a flowchart showing a dehydration processing subroutine.

In the dehydration processing subroutine, first, it is determined whether or not the unbalanced memory data is 1 (step 101).
This unbalanced memory data is set to “1” when abnormal vibration is detected by the abnormal vibration switch 102 during the dehydrating operation performed before the processing, and the first dehydrating operation is performed. Before the operation is performed, it is initialized to “0”.

In step 101, unbalanced memory data is 1
If it is determined that this is not the case, a loosening operation for 30 seconds is performed (step 102), while if it is determined that the unbalanced memory data is 1, a loosening operation for 50 seconds is performed (step 103). In each of these cases, the loosening operation repeats the forward and reverse rotation of the drum 3 at a low speed of, for example, 47 rpm with a cycle of, for example, 5 seconds on and 1 second off.

Next, it is determined whether or not the loosening operation is completed (step 104). If it is determined in step 104 that the loosening operation has been completed, the rotation speed of the drum 3 is increased to a predetermined rotation speed (for example,
800 rpm) (step 105), and spin at that speed.

Next, it is determined whether or not a dehydration set time, which is a predetermined dehydration time, has ended (step 106). If it is determined that the dehydration set time has not ended, the abnormal vibration switch 102 is turned off. It is determined whether or not vibration has been detected (step 107).

If it is determined in step 107 that abnormal vibration has not been detected, the process returns to step 106 and the above-described processing is repeated. On the other hand, if abnormal vibration has been detected, the unbalanced memory data is set to “1”. (Step 10
8) The dehydration is stopped by setting the elapsed time of the dehydration set time to 0 second (Step 109), returning to Step 101, repeating the above-described processing, and restarting dehydration from the loosening operation.

If it is determined in step 106 that the dehydration set time has ended, the process returns to the main routine.

In this way, when abnormal vibration is detected during the dehydrating operation in the rinsing step and the dehydrating step, the loosening time of the loosening operation performed after the abnormal vibration is detected is reduced from 30 seconds.
Since the length is increased to 50 seconds, in the loosening operation performed after the abnormal vibration is detected, the clothes are sufficiently loosened, and the eccentricity of the drum 3 is suppressed.

In the present embodiment, the time between the loosening operation in the rinsing step and the loosening operation in the dehydrating step and the time between the dewatering operation in the rinsing step and the dehydrating operation in the dewatering step are equal, but the present invention is not limited to this. It may be different.

〔effect〕

As described above in detail, in the washing machine according to the present invention, when abnormal vibration is detected during the dehydrating operation in the rinsing step and the dehydrating step, the time of the loosening operation performed thereafter is set to the time of the previous loosening operation. Since the time is longer than the time, reliable loosening can be performed, eccentricity of the washing tub can be suppressed, and abnormal vibration during the dehydration can be suppressed, so that a stable dehydration operation can be performed. The invention has excellent effects.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a washing machine according to the present invention, FIG. 2 is a vertical sectional view of the outside of the outer tub as viewed from the front, FIG. 4 is a longitudinal sectional view of the inside of the drum as viewed from the side, FIG. 5 is a plan view of a keyboard of the operation unit, FIG. 6 is a schematic block diagram showing a control system configuration of the washing machine, and FIG. Flowchart showing the main routine of operation control from the process to the spin-drying process, FIG.
The figure is a flowchart showing a dehydration processing subroutine. 2 ... Outer tank, 3 ... Drum, 100 ... First microcomputer, 102 ... Abnormal vibration switch, 200 ... Second microcomputer

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) D06F 33/02

Claims (1)

(57) [Claims] 1. An outer tub and a washing tub rotating inside the outer tub,
Means for detecting abnormal vibration of the washing tub, and sequentially executing a washing step, a rinsing step of sequentially performing a loosening operation, a dehydrating operation and a rinsing operation, and a dehydrating step of sequentially performing a loosening operation and a dehydrating operation, If the abnormal vibration is detected during the dehydrating operation in the rinsing step and the dehydrating step, the dehydrating operation is stopped, and the washing machine is configured to perform the loosening operation and the dehydrating operation again. Washing machine characterized in that, when abnormal vibration is detected during the dewatering operation, the time of the loosening operation performed thereafter is set to be longer than the time of the previous loosening operation.