JP2846723B2 - Washing machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a washing / drying machine that executes washing and dehydration by rotating a washing tub disposed in an outer tub.

(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 which rotates and reciprocates to wash and rinse clothes, and rotates the drum at a high speed for dehydration.

When performing dehydration with such a washing machine, for example,
As disclosed in Japanese Patent Application Laid-Open No. 60-41986, the set number of rotations of the drum is determined for each of low-speed rotation, balance rotation, weak spinning rotation, and strong spinning rotation, and the low-speed rotation, balance rotation, weak spinning rotation, and strong spinning rotation are determined. 2. Description of the Related Art There is a washing machine that performs a spinning rotation and a rotation speed increase in which the rotation speed of the drum is sequentially increased to a predetermined rotation speed.

In addition, after performing a loosening operation of rotating the drum forward and reverse at a low speed in order to balance the clothes in the drum, control is performed by gradually increasing the rotation speed of the drum and sequentially performing weak dehydration and strong dehydration of a predetermined intensity. There are washing machines that do.

[Problems to be solved by the invention]

However, in the washing machine disclosed in Japanese Patent Application Laid-Open No. 60-41986, it is difficult to loosen the clothes uniformly in the balance rotation, and the rotation speed is increased while the clothes are attached to the drum in an eccentric state. Thus, there is a problem that the vibration of the drum becomes intense at the time of the weak spinning and the strong spinning. In the above-described washing machine in which the rotation speed of the drum is gradually increased after the loosening operation, the rotation speed of the drum after the loosening operation is gradually increased, so that the clothes loosened by the loosening operation rotate the drum. There is a problem in that the eccentricity occurs when the number increases, and the weak dehydration and the strong dehydration are performed while the eccentric state remains on the drum.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and has been made to improve the stability at the time of dehydration by suppressing the eccentricity of a drum when performing dehydration and suppressing excessive vibration in the resonance rotation speed region. The purpose is to provide a machine.

[Means for solving the problem]

The washing machine according to the present invention has an outer tub, a washing tub that rotates inside the washing tub to perform washing and dehydration, a time counting unit that measures time after the start of dehydration, and a set rotation speed of the washing tub during dehydration. Means for storing in chronological order according to the elapsed time after the start of dehydration,
Means for controlling the number of revolutions of the washing tub to the set number of revolutions according to the result of the clocking of the clocking means, and at the time of spin-drying, after spinning the washing tub for loosening, for spin-drying. A washing machine configured to increase the rotation speed to a predetermined rotation speed, a means for determining whether or not the rotation for the loosening is completed; and And a means for increasing the rotation speed of the washing tub at a rate of increase higher than the rate of rotation thereafter, up to a rotation speed lower than the resonance rotation speed region of the washing tub. And

[Action]

In the present invention, in the case of increasing the rotation speed of the washing tub during dehydration, after the end of the rotation for loosening, it is lower than a predetermined rotation speed which is the final target rotation speed, and the resonance rotation speed of the washing tub Up to the rotation speed higher than the area, the rotation speed is increased at a higher growth rate than the subsequent rotation speed, so the clothes loosened by the rotation for loosening will be Scattered and adhered to the washing tub by centrifugal force almost uniformly, the eccentricity of the tip tub can be suppressed, and in addition, it passes through the resonance speed region of the washing tub in a short time, and violently in the resonance speed region Since the duration of the vibration is extremely short, the vibration of the washing tub in the resonance rotation speed region can be reduced.

〔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 discharging 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, buffers 31 a, 31 b, 31 having a triangular cross section formed to bulge toward the axis of the body 31.
The buffers 31a, 31b, and 31c are arranged so that when the drum 3 rotates and rotates, the laundry such as clothes in the drum 3 is scraped up. Also, the drum of drum 3
A number of lateral ribs 301, 301,... Extending in the axial direction of the drum 3 are formed on the inner and outer peripheral surfaces of the 31. Further, a large number of through-holes 302, 302,... Are formed in the body 31 so that water is supplied to and discharged from the drum 3 through the through-holes 302, 302,.

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
By sliding in the inside 90, the lower clothing inlet 10c is opened and closed. 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. At the center of the upper surface of the lid 38, a storage section 380 for storing a laundry treatment agent such as a detergent, a bleaching agent and a softening agent is formed 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 protrudes 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. A drive shaft of the motor 75 and the drive pulley 74 are connected via a belt 76. Connected. A magnet 77 is mounted on the outer tub 2 side of the drive pulley 74, and a reed switch is provided at a position facing the magnet 77 on the outer surface of the rear wall of the outer tub 2.
A reed switch 78 is provided so that the reed switch 78 is closed when the magnet 77 approaches and is opened when the magnet 77 separates, as the driving pulley 74 rotates. 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,...) According to the type of laundry and the like and a finish state of drying are set at a position to the right of the heater output setting key 111e. 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 provided 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. The rinsing step includes, for example, a first intermediate dehydrating operation → first
Rinsing operation → second intermediate dehydrating operation → second rinsing operation..., And the rinsing operation and the intermediate dehydrating operation performed before the rinsing operation are repeated a plurality of times. In addition, in the dehydration step, the clothing of the drum 3 is loosened by performing the normal / reverse rotation and the stop of the drum 3 at a predetermined cycle.
After performing the loosening operation, control is performed to increase the rotation speed of the drum 3 by a control method described later, and the rotation speed of the drum 3 is accelerated to a predetermined rotation speed to perform normal dehydration. ing.

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
For example, within a set time with an operation cycle of 9 seconds on-3 seconds off,
Repeat reciprocating rotation. As a result, the drum 3 reciprocates and the so-called slap washing in which the laundry is lifted by the baffles 31a, 31b, 31c and falls in the drum 3 is performed. Further, for example, for 2 seconds at the same time when the motor 75 is turned off as described above,
The DC braking is applied to the motor 75. As a result, the drum 3 stops suddenly, so that the laundry is beaten against the inner wall of the drum 3 by the reaction, and the washing is performed.

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 intermediate dehydration operation and the dehydration step during the rinsing step, when the water level of the outer tub 2 becomes the reset water level indicating a predetermined low water level at which the drum 3 can be rotated for dehydration, the motor 75 is turned off. The rotation speed is increased by a rotation speed increase control described later, and the motor is rotated in one direction at a high speed.
Thereby, the laundry in the drum 3 is dehydrated by centrifugal force.

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

Next, a description will be given of a method of increasing the rotation speed of the drum 3 during dehydration in the washing machine configured as described above. FIG. 7 is a flowchart showing a procedure for controlling the rotation speed of the drum 3 during dehydration.

First, the first microcomputer 100 initializes the time count _Tc to 0 (step 1), and starts counting time (step 2).

Next, it is determined whether or not one second has elapsed (step 3), and only when it is determined that one second has elapsed, 1 is added to the time count _Tc (step 4). Thus, the time count _Tc is such that the count value increases by one every second.

After the start of such timing, it is determined whether or not the time count _Tc is 5 or more (step 5).

If it is determined in step 5 that the time count _Tc is not 5 or more, the process proceeds to step 6 where the drum 3 is moved to 47 rp.
Turn right (forward rotation) in front view at m and return to step 3,
The above processing is repeated. On the other hand, if it is determined in step 5 that the time count _Tc is 5 or more, it is determined whether the time count _Tc is 6 or more (step 7).

If it is determined in step 7 that the time count _Tc is not equal to or more than 6, the process proceeds to step 8 to stop the drum 3, returns to step 3, and repeats the above-described processing. On the other hand, if it is determined in step 7 that the time count _Tc is 6 or more, it is determined whether the time count _Tc is 11 or more (step 9).

If it is determined in step 9 that the time count _Tc is not equal to or greater than 11, the process proceeds to step 10 where the drum 3 is moved to 47 rp.
Turn left (reverse) in front view at m and return to step 3,
The above processing is repeated. On the other hand, if it is determined in step 9 that the time count _Tc is 11 or more, it is determined whether the time count _Tc is 12 or more (step 1).
1).

If it is determined in step 11 that the time count _Tc is not equal to or greater than 12, the process proceeds to step 8 to stop the drum 3, returns to step 3, and repeats the above-described processing.

Thus, in steps 5 to 11, 5 seconds on-1
The drum 3 is rotated forward and backward (left and right rotation) in a cycle of seconds off.
Then, in steps 12 to 31 after this, the forward / reverse rotation of the drum 3 is repeated in a cycle of 5 seconds on-one second off according to the increase of the time count _Tc , as in steps 5 to 11.

The processing from step 5 to step 31 is a loosening operation for loosening clothes in the drum 3, and is performed for 5 seconds on-1.
The forward and reverse rotation of the drum 3 is repeated at a cycle of seconds off, and the clothes are loosened.

Next, in step 32, it is determined whether or not the time count _Tc is 74 or more.

If it is determined in step 32 that the time count _Tc is not equal to or greater than 74, the process proceeds to step 6 and the drum 3 is moved to 47 rp.
Rotate to the right by m, return to step 3, and repeat the above processing.

Next, when it is determined in step 32 that the time count _Tc is 74 or more, it is determined whether the time count _Tc is 80 or more (step 33).

If it is determined in step 33 that the time count _Tc is not 80 or more, the rotation speed of the drum 3 is increased from 47 rpm to 260 rpm.
It accelerates to rpm in 6 seconds (step 34), returns to step 3, and repeats the above processing. On the other hand, if it is determined in step 33 that the time count _Tc is 80 or more, it is determined whether the time count _Tc is 120 or more (step 35).

If it is determined in step 35 that the time count _Tc is not 120 or more, the rotation speed of the drum 3 is maintained at 260 rpm (step 36), and the process returns to step 3 and repeats the above-described processing. That is, dehydration is performed at 260 rpm for 40 seconds, and water contained in clothes is appropriately removed. On the other hand, if it is determined in step 35 that the time count _Tc is 120 or more, it is determined whether the time count _Tc is 150 or more (step 37).

If it is determined in step 37 that the time count _Tc is not 150 or more, the rotation speed of the drum 3 is increased from 260 rpm.
Accelerate to 800rpm in 30 seconds (Step 38), Step 3
And the above processing is repeated. On the other hand, if it is determined in step 37 that the time count _Tc is 150 or more, it is determined whether the time count _Tc is 330 or more (step 39).

If it is determined in step 39 that the time count _Tc is not 330 or more, the rotation speed of the drum 3 is maintained at 800 rpm (step 30), and the process returns to step 3 to repeat the above-described processing. That is, 800rpm to complete the dehydration of clothing
Perform high-speed dehydration for 180 seconds. If it is determined in step 39 that the time count _Tc is equal to or greater than 330, the drum 3 is stopped and the process is terminated (end of spin-drying).

Next, the acceleration characteristics of the rotation speed in the above-described rotation speed increase control will be described. Eighth is a graph showing the acceleration characteristics of the rotation speed in the rotation speed increase control, the horizontal axis is the elapsed time after the start of dehydration, the vertical axis is the rotation speed of the drum 3,
These relationships are shown.

In steps 5 to 31, the loosening operation is performed by repeating the forward / reverse rotation of 47 rpm, and the entangled clothes are loosened in the drum 3. After the end of the loosening operation, the rotation speed of the drum 3 is again set to 47 rpm, and thereafter, as shown by the line segment a in the drawing, the acceleration is rapidly accelerated from 47 rpm to 260 rpm in 6 seconds in steps 33 and 34 in 6 seconds. When such a rapid acceleration is performed, the loosened clothes in the drum 3 are scattered and adhere to the inner periphery of the drum 3 substantially uniformly by centrifugal force, and the eccentricity of the drum 3 is suppressed. In addition to this, when such a rapid acceleration is performed, for example, from 60 rpm to 2
It passes through the resonance speed region of the drum 3 existing up to 00 rpm in a short time, and abnormal vibration due to resonance in this resonance speed region is suppressed.

Then, after such rapid acceleration, in steps 35 and 36, as shown by the line segment b in the figure, the rotation speed of the drum 3 is maintained at 260 rpm for 40 seconds to perform weak dehydration. This weak dehydration is for reducing the load on the motor 75 during the acceleration of the drum 3 performed in steps 37 and 38, and the water contained in the clothes is appropriately removed by the weak dehydration to reduce the weight of the clothes.

After the weak dehydration, as shown by the line segment c in the figure, in steps 37 and 38, acceleration is performed from 260 rpm to 800 rpm in 30 seconds. In this acceleration, since the weight of the clothes is reduced by the weak dehydration, the acceleration can be performed with a relatively low load. After the completion of the acceleration, as shown by a line segment d in the figure, 800 rpm is maintained for 180 seconds to perform strong dehydration, and the dehydration is completed.

By accelerating such characteristics, the drum 3 can stably increase the rotational speed without causing abnormal vibration during dehydration. In addition, when the rotation speed of the drum 3 is increased from the rotation speed of the weak dehydration to the rotation speed of the strong dehydration, the weight of the clothes is reduced in the weak dehydration, and the load on the motor 75 can be reduced, so that the output is small. The motor can be provided in the washing machine.

〔effect〕

As described in detail above, in the washing machine according to the present invention, after the rotation for loosening is completed, the rotation speed is lower than a predetermined rotation speed which is a final target rotation speed of dehydration and lower than a resonance rotation speed region of the washing tub. Up to a high rotation speed, the rotation speed is increased at a higher increase rate than the subsequent increase rate, and the clothes loosened by the rotation for loosening are put in the washing tub by a sharp increase in the rotation speed. Scattered and adhered almost uniformly in the washing tub by centrifugal force, so the eccentricity of the washing tub was suppressed,
In addition to this, since the vibration passes through the resonance tub in the washing tub in a short time, the duration of intense vibration in the resonance tub becomes extremely short, and the vibration is reduced, thereby increasing the rotation of the washing tub. The present invention has excellent effects, such as excessive vibration in the resonance region of the washing tub is sometimes suppressed and stability during dehydration can be improved.

[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. 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 the configuration of a control system of the washing machine, and FIG. And FIG. 8 is a graph showing the acceleration characteristics of the rotation speed in the rotation speed increase control. 2 ... Outer tank, 3 ... Drum, 100 ... First microcomputer, 200 ... Second microcomputer

Continuation of the front page (56) References JP-A-1-218495 (JP, A) JP-A-64-40093 (JP, A) JP-A-1-314599 (JP, A) JP-A-60-41986 (JP) JP-A-62-164493 (JP, A) JP-A-4-129959 (JP, A) JP-A-62-268597 (JP, A) JP-A-62-179499 (JP, A) 61-51918 (JP, B2) JP 47-38114 (JP, B1) (58) Fields investigated (Int. Cl. ⁶ , DB name) D06F 33/02

Claims (1)

(57) [Claims] 1. An outer tub, a washing tub that rotates inside the washing tub to perform washing and dehydration, a time counting means for measuring a time after the start of dehydration, and a set rotation speed of the washing tub at the time of dehydration after the dehydration starts. Means for storing in chronological order according to the elapsed time, and means for controlling the number of revolutions of the washing tub to the set number of revolutions according to the result of the clocking of the time keeping means. After performing the rotation for loosening, in a washing machine configured to increase the rotation speed to a predetermined rotation speed for dehydration, a means for determining whether or not the rotation for loosening is completed. After the end of the rotation for loosening, the washing is performed at a rate higher than the predetermined rate and higher than the resonance rate range of the washing tub at a rate higher than the rate thereafter. Means for increasing the rotation speed of the tank. Washing machine and.