JPH03284285A - Washing machine - Google Patents

Abstract

PURPOSE:To stop a rotary tank at a desired stop position by rotating a rotational position electing means and a rotary tank with speed slower than the rotational speed in the dehydrating rotation to controllably stop the rotary tank at the desired stop position on the basis of a rotational position detecting signal of the rotational position detecting means. CONSTITUTION:In the case that a rotary tank 17 is stopped at a fixed position, a position detecting sensor 42 is provided to output a position detecting signal when the rotary tank 17 is rotated and located at the fixed position. While the rotary tank 17 is rotated with about 30rpm, the rotary tank 17 is temporarily stopped on this side of a desired stop position, for example about 10-300mm short thereof on the basis of the position detecting signal. Further, after the temporary stop, the rotary tank 17 is rotated with 1rpm and constituted to stop at the desired stop position. Thus, since the rotational speed of the rotary tank 17 can be set relatively high speed until it is stopped temporarily on this side of the desired stop position, the rotary tank 17 is rotated with slow speed, 1rpm, only in the slight rotational distance from this side of the desired stop position.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a washing machine having a rotatable spinning tank for dehydration and washing in an outer tank, for example, a water receiving tank. .

(Prior Art) In this type of washing machine, a dehydration hole is formed at the upper end of a rotating tub, and water is stored only in the rotating tub during washing. With this configuration, since the washing liquid does not accumulate between the water receiving tank and the rotating tub, it is possible to prevent soap scum and the like from forming on the inner surface of the water receiving tank and the outer surface of the rotating tub.

(Problem to be Solved by the Invention) However, in the above conventional configuration, when draining water in the rotating tank, the rotating tank is rotated at high speed and the water is centrifugally dehydrated from the dewatering hole at the upper end, so a considerable amount of water is generated in the initial stage of draining. water is blown away from the rotating tank in the centrifugal direction and hits the water receiving tank, causing a
The drawback was that it produced a lot of noise. Also,
After the water in the rotating tank was drained, foreign matter such as sand and dirt sometimes accumulated at the inner bottom of the rotating tank.

In order to solve these drawbacks, the present inventor provided a drain hole and a drain valve at the bottom of the rotating tank, and provided a drive unit to open and close the drain valve at the bottom of the water receiving tank. I'm thinking of configuring it to drain water through a drainage hole at the bottom of the unit.

With this configuration, a large amount of water will not be blown away and hit the water tank, and generation of large noise can be prevented. Further, since foreign matter such as sand and dirt is discharged from the drainage hole at the bottom together with water, foreign matter will not accumulate at the inner bottom of the rotating tank.

In the case of the above configuration, since the drain valve is driven to open and close by the drive section, it is necessary to make the drain valve and the drive section correspond to each other when draining water.

However, in conventional washing machines with both spin-drying and spin-drying functions, when the rotating tub is stopped, the rotation stop position is random. Therefore, in order to realize the above-described configuration, it is desired to stop the rotating tank at a target stop position.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a washing machine that can stop a rotating tub at a target stop position.

[Structure of the Invention] (Means for Solving the Problems) A washing machine of the present invention includes an outer tub and a rotating tub for dewatering and washing that is rotatably provided in the outer tub. comprising a rotational position detection means for detecting the rotational position of the
A stop means is provided for rotating the rotary tank at a speed lower than a rotation speed during dehydration rotation and braking the rotary tank to stop the rotary tank at a target stop position based on a rotational position detection signal of the rotational position detection means. It has some characteristics.

In this case, the stopping means rotates the rotary tank at a speed lower than the rotation speed during dehydration rotation, and brakes the rotary tank based on the rotational position detection signal of the rotational position detection means, so that the rotary tank is stopped just before the target stop position. a first stopping means for temporarily stopping; and after the temporary stopping, the rotating cypress is further rotated at a slower speed, and the rotating tank is braked based on a rotational position detection signal of the rotational position detection means to reach a target stopping position. It is also possible to include a second stopping means for stopping the motor.

Moreover, in each of the above configurations, it is preferable to include a locking device that locks the rotary tank at the stop position while the rotary tank is stopped at the target stop position.

In this case, the locking device is provided with a plurality of lock parts displaceably provided on the outer tank side, and is provided on the rotating tank side and locks the plurality of lock parts when the rotating tank is stopped at a target stop position. It may be configured to include an engaging portion that engages.

(Function) According to the above means, when stopping the rotary tank, the rotary tank is rotated at a speed lower than the rotation speed during dehydration rotation, and the rotary tank is braked based on the rotational position detection signal of the rotational position detection means. Therefore, the rotary tank stops accurately at the target stop position.

Further, the first stopping means temporarily stops the rotating tank before the target stop position, and after this temporary stop, the second stopping means rotates the rotating tank at an even slower speed to target the rotating tank. If the configuration is configured to perform two-step stop control to stop at the stop position, the rotation speed of the rotating tank can be set at a relatively high speed until it is temporarily stopped before the target stop position, so that the rotation It is sufficient to rotate the tank at a slow speed a short distance from the target stop position. Therefore, the time required to rotate the rotary tank at a slow speed can be shortened, and the time required until it stops can be shortened as a whole.

On the other hand, in the case of the above configuration, the speed of the rotary tank in the second stage of stop control can be set lower, so the accuracy of the stop position can be increased.

Furthermore, if the rotary tank is configured to be locked at the stop position while the rotary tank is stopped at the target stop position, the rotary tank will not move from the stop position even if an external force is applied.

In addition, when locking the rotating tank in the stopped position,
Since a plurality of lock parts are configured to engage with the engaging part on the rotary tank side, the number of engaging parts increases and the strength of engagement increases. Therefore, even if an external force is applied, the locking part becomes more difficult to disengage from the engaging part, so that the rotating tank can be reliably locked.

(Example) Hereinafter, Figures 1 to 11 will be described for the first example of the present invention.
This will be explained with reference to the figures.

First, in FIG. 2, a water receiving tank 12, which is an outer tank, is disposed inside an outer box 11 and supported by an elastic suspension mechanism 13, only a portion of which is shown. A drive mechanism 15 mainly including a motor 14 and a drain hose 16 are provided at the outer lower blade part of the water receiving tank 12.
On the other hand, inside the water receiving tank 12, a rotary tank 17 for dehydration and washing is rotatably provided.

The rotary tank 17 has a plurality of small holes 8 arranged in horizontal rows as dewatering ports only at the upper end thereof. The rotating tank 17 is attached to a dewatering shaft 19 that projects into the water receiving tank 12 from the drive mechanism 15 . Note that a stirring body 20 is disposed in the inner lower part of the rotating tank 17, and this stirring body 2
0 is attached to a washing shaft 21 that protrudes from the dewatering shaft 19 into the rotating tub 17. Thereby, the agitator 20 is rotated by the washing shaft 21 during washing, thereby washing the clothes.

Now, as shown in FIG. 3, at the bottom of the rotary tank 17, a support cylinder part 22 is provided protrudingly located at the peripheral edge, and a plurality of through holes are formed around this support cylinder part 22. ing. A drain port 23 is constituted by these plurality of through holes.

The valve mechanism 24 that opens and closes this drain port 23 is a plate-shaped valve 25.
, a compression coil spring 26 and a spring receiver 27.

A backing 28 is attached to the outer peripheral portion of the valve 25, and a support rod portion 25a is provided on the lower surface in the figure to protrude downward. This support rod portion 25a is inserted through the support tube portion 22 of the rotary tank 17, thereby allowing the valve 25 to move up and down. A spring receiver 27 is attached to the lower end of the support rod portion 25a, and a compression coil spring 26 is interposed between the spring receiver 27 and the bottom of the rotating tank ]-7. Due to the spring force of the compression coil spring 26, the valve 25 normally closes the drain port 23.

On the other hand, two drive units for driving the valve mechanism 24 to open and close are provided at the bottom of the water tank 2.

In this drive section 29, a through hole 30 is formed at the bottom of the water receiving tank 12, corresponding to the drain port 23 of the rotating tank 17. A mounting plate 31 is attached to the outer bottom of the water receiving tank 12 at the periphery of the through-hole 30, and a through-hole 31a is formed in the center of the mounting plate 31. A push rod 32, which is a push member, is inserted into the through hole 31a and is movable up and down. A plate portion ti432a is attached to the upper end of the push rod 32, and this plate member 3
A bellows 33 is integrally molded to cover 2a.

The bellows 33 has a peripheral portion attached to the outer bottom of the water receiving tank 12 by a mounting plate 31 so as to close the through hole 30 . A spring receiver 34 is attached to the lower end of the push rod 32, and a compression coil spring 35 is interposed between the spring receiver 34 and the mounting plate 31. The spring force of the compression coil spring 35 normally urges the push rod 32 downward and places it in the position shown in FIG. Further, a guard motor 36 is disposed below the push rod 32. This geared motor 36 has a built-in gear as a speed reduction means. Guard motor 36
A cam 37 is attached to the output shaft of the cam 37, and the lower end of the push rod 32 comes into contact with the cam surface 37a of the cam 37.

In addition, on the upper surface of the balance ring 38 of the rotating tank 17,
As shown in FIGS. 4 and 5, a magnet 39 is fixed. On the other hand, a reed switch 41 is installed on the lower surface of the cypress cover 40 attached to the upper end of the water tank 12.
is fixed with screws. These magnets 3
9 and lead 0 switch 41 constitute a position detection sensor 42 which is rotational position detection means. This position detection sensor 42 detects the rotational position of the rotating tank 17 at a fixed position, that is, at the drain port 2.
3, the valve mechanism 24, and the drive unit 29 are detected at opposing positions, and a position detection signal is output. Specifically, the magnet 39 faces and approaches the reed switch 41 in the above-mentioned normal position, thereby turning on the reed switch 41. Here, the above-mentioned fixed position is the target stop position of the rotating tank 17. In addition, rotating tank 17
Inside, cover members 43 and 44 extending from the bottom to the top end are mounted, for example, at symmetrical positions (left and right in FIG. 2). A space is formed between each of the cover members 43 and 44 and the rotating tank]7.

On the other hand, the drive mechanism 15 will be described with reference to FIGS. 6 and 7. The drive mechanism 15 is shown in FIG. 61 in order to transmit the rotational force of the motor 14 at a reduced speed to the stirring body 20 during washing, and to transmit it to the rotary tank 17 and the stirring body 20 during dehydration to rotate both together. As such, a reduction gear device 45, a clutch mechanism 46, a brake device 47, etc. are built in. The case 48 of the drive mechanism] 5 consists of an upper case 48a and a lower case 48b, and is fixed to the outer bottom of the water receiving tank 12. Here, one dewatering shaft is constructed by integrally connecting an upper hollow shaft 49 and a lower hollow shaft 50 with a gear case 51.

Gear case 51 is a casing of reduction gear 45,
A sleeve 51c is formed by combining a gear case main body 51a and a lid 51b that closes a lower opening of the gear case main body 51a, and is integrally formed at the upper end of the gear case main body 51a. The lower hollow shaft 50 is integrally formed with the lower hollow shaft 50. The upper hollow shaft 49 of the dehydration shaft 19 is supported by the upper case 48a via a bearing 52, and the lower hollow shaft 50 is supported by the lower case 48b via a bearing 53.

Further, within the gear case 51, a well-known planetary gear mechanism 54 for speed reduction is provided. The washing shaft 21 is the output shaft 2 of the planetary gear mechanism 54. Further, a drive shaft 55 which is an input shaft of the planetary gear mechanism 54 transfers the rotational force from the motor 14 to a belt transmission mechanism 56.
and is adapted to be rotated by being received via a connecting shaft 57. On the other hand, the clutch mechanism 46 includes a clutch spring 58, a clutch sleeve 59 below the clutch spring 58, a clutch lever 60, and the like. The movement of the clutch lever 60 is controlled together with the brake lever 61 by an electromagnet 62 (see FIG. 9), which will be described later.

Now, regarding the brake device 47, a brake drum 63 is fixed to the outer periphery of the gear case main body 51a. A brake band 64 for braking the brake drum 63 is attached to the outer peripheral surface of the brake drum 63, and a pivot shaft 64 whose one end is fixed to the lower case 48b
5, and the other end is connected to a brake lever 61 rotatably supported by a pivot 65 on the lower case 48b. A brake shoe 648 is attached to the surface of the brake band 64 that contacts the brake drum 63. The brake lever 61 is always connected to the brake band 6 by a tension coil spring (not shown).
4 is rotationally biased in the direction of tightening the brake drum 63. Further, the brake lever 61 is rotatably driven in the direction in which the brake band 64 is loosened when the electromagnet 62 is energized.

Here, the upper flange portion of the brake drum 63 is formed with, for example, a notch portion 63a as an engaging portion. For example, the lock claw 6 can be used as a lock portion that engages with the large portion 63a.
A lock lever 66 having a shaft 6a is attached to the case 48 with a pivot 6a.
It is rotatably supported by 7. Lock lever 66
is normally biased by a compression coil spring 68 to rotate in a direction in which the lock pawl 66a engages with the notch 63a. In addition, the lock lever 66 has a lock claw 6 by six electromagnets.
The notch 6a is rotated in a direction in which the engagement between the notch 63a and the notch 63a is released. These lock levers 66,
The locking device 70 includes the lock claw 66a1, the electromagnet 69, the compression coil spring 68, the notch 63a, and the like.

A microswitch 71 (see FIG. 7) provided near the lock lever 664 is activated when the electromagnet 69 is energized, that is, when the lock claw 6
6a is in a non-engaged state with the notch 63a, an on signal is output as a non-engagement detection signal. Note that the lock lever 66 is made of metal, for example.

On the other hand, as shown in FIG. 8, three electrode pieces 73a, 73b, and 73c are provided on the inner surface of the rotating tank 17 with a "low" height.
, "medium" and "high". The upper end of the rotating tank 17, in this case, especially the upper surface of the balance ring 38, is provided with the electrode pieces 73a, 73.
b, 73 The same number of first electrode plates 74 a, 7 as c
4b and 74c are arranged at evenly different positions in the rotational direction of the rotating tank 17, and these first electrode plates 74a
, 74b, 74c and the electrode pieces 73a, 73b, 73c are electrically connected by lead wires 75a, 75b, 75c, respectively. A non-rotating member facing the upper surface of the balance ring 38 of the rotating tank 17, in this case,
On the lower surface of the tank cover 40, the same number of second electrode plates 76a, 76b, 76c as the fifteenth electrode plates 74a, 74b, 74c are arranged.
b, 74c so that the positional relationship is a pair with each other,
They are arranged at evenly different positions in the rotational direction of the rotating tank 17. Here, when the rotating tank 17 is rotated to the above-described fixed position, the first electrode plates 74a, 74b, 74c
and second electrode plates 76a, 76b, and 76c are arranged to face each other. Note that the second electrode plate 76a
+ 76 b and 76 c are connected to a control device 77, and the drive mechanism 15 has a power of 10 [kH], for example.
2] is connected to the oscillator 78 which oscillates a sine wave signal.

Further, in FIG. 9 showing the electrical configuration, the control device 77 includes, for example, a microcomputer, and has a function of a stop means in addition to a washing operation control function. In this case, the stopping means includes, for example, a first stopping means and a second stopping means. The above control device 7
7 has a control program for controlling the overall washing operation, and 6 a water supply valve 79 provided to supply water to the motor 14, the guard motor 36, the electromagnet 62, 69, and the rotary tub 17 based on the control program. A circuit 80 that drives loads such as
. . . 84, etc., to control power supply/disconnection. Further, the control device 77 receives a position detection signal regarding the rotational position of the rotary tank 17 from the reed switch 41 of the position detection sensor 42 and a switch signal from the microswitch 71, and also receives a switch signal from the microswitch 71.

The water level detection signal from 76c is sent to analog switch 85a.
, 85b, 85c, a signal reception switching circuit,
The signal is received through a filter 86, an amplifier 87, and a comparator 88 in this order. Note that 89°90 is a resistor that divides the DC power supply voltage.

Next, the operation of the above configuration will be explained with reference also to FIGS. 1, 10, and 11.

First, the case of supplying water into the rotating tank 17 will be described. At the time of this water supply, control is first performed to rotate the rotating tank 17 to a fixed position, which is a target stop position, and then stop it. This control will be explained below according to the flowchart of FIG.

This FIG. 1 shows the contents of the part of the control program stored in the control device 77 that stops the rotating tank 17 at a fixed position, that is, the functions of the first stopping means and the second stopping means. In this case, by energizing the electromagnet 62 of the brake device 47, the rotary tank 17 is brought into a non-braking state, and by energizing the electromagnet 69, the lock lever 66 is brought to a non-braking state.
is disengaged from the notch 63a of the brake drum 63. In this state, the motor 14 is first controlled by the control device 7.
7, the rotating tank 17 is rotated at low speed by being energized in a power cut mode. Specifically, as shown in FIG. 11(a), for example, by repeatedly energizing one waveform of the AC power supply waveform (the shaded area indicates on) and four waveforms off, the rotating tank 17 is turned on during dehydration rotation. The rotation speed is lower than the rotation speed of, for example, about 3 Orpm. Here, three rotations are made at the above rotational speed (the reed switch 4 of the position detection sensor 42
1 until the position detection signal is output three times), and the time 8 required for the rotating tank 17 to rotate once is measured. Specifically, the counter (X) is incremented for the third rotation, that is, the time from when the second position detection signal is output until the third position detection signal is output (steps 81 to 5). Thereafter, when the rotating tank 17 is rotated 7/8 times at the same rotational speed, the motor 14 is cut off, the electromagnet 62 is cut off, and the rotating tank 17 is braked by the brake device 47. Specifically, the counter (
7/8 of the count value of the counter (X) is assigned to Y), and when the counter (Y) is decremented and reaches "0", braking is performed by the brake device 47 (steps 86 to 10). As a result, the rotating tank 17 stops with the magnet 39 located at a position approximately 10 to 300 mm in front of the reed switch 41, as shown in FIG. After this, the rotating tank 17 is rotated at an even slower speed. Specifically, as shown in FIG. 11(b), for example, by repeatedly energizing one waveform of the AC power supply waveform (the shaded area indicates on) and six waveforms off, the rotating tank 17 is driven at about lrpm. Rotate (step 511). This rotational speed 9 is a rotational speed at which the rotating tank 17 immediately stops when the rotating tank] 7 is braked by the brake device 47. When the rotary tank 17 reaches a certain position due to the low-speed rotation, the reed switch 41 activates the position detection 1+! When this position detection signal is received, motor 1 is output.
4 and the rotating tank 17 is braked and stopped by the brake device 47 (step S12, 1B). As a result, the magnet 39 faces the reed switch 41, that is, the first electrode plates 74a, 74b, 74c and the second
The rotating tank 17 stops with the electrode plates 76a, 76b, and 76c facing each other. Subsequently, for example, after 3 seconds have elapsed, the electromagnet 69 is cut off and the lock lever 66 is moved to the notch 6 of the brake drum 63.
3a to lock the rotating tank 17 (step S
14.15).

Next, in this state, the water supply valve 79 is energized and opened, and water supply into the rotating tank 17 is started.

At this time, since the drain port 23 is closed by the valve mechanism 24, water is stored only in the rotating tank 17. Then, as the water supply time passes, the water level in the rotating tank 17 gradually rises, and when the water level reaches the lowest electrode piece 73a and the water surface comes into contact with the electrode piece 73a, the oscillator 78 is connected to this electrode piece 73a. is electrically connected via the drive mechanism 5 and the water stored in the rotating tank 17. As a result, the output signal from the oscillator 78 comes to be transmitted to the electrode piece 73a, and is further transmitted to the first electrode plate 74a electrically connected to the electrode piece 73a.
A second electrode plate 76a is electrostatically coupled to the second electrode plate 76a.
It is transmitted to Therefore, if the analog switch 85a of the signal reception switching circuit is now enabled in order to keep the water level in the rotating tank 17 at the "low" position where the electrode piece 73a is located, the second electrode plate 76a The signal transmitted to the analog switch 85a then passes through a filter 86 to remove noise, is amplified by an amplifier 87, and is passed through a resistor 89.
．． The voltage becomes equal to or higher than the voltage divided at 90, and is inputted to the control device 77 as a water level detection signal via the comparator 80. As a result, it is detected that the water level stored in the rotary tank 17 due to water supply has reached the electrode piece 73a at the low position.

On the other hand, in order to stop the water level stored in the rotary tank 17 due to water supply from the "low" position where the electrode piece 73a is located, and at the "center position" where the electrode piece 73b is located, the signal reception switching circuit If the analog switch 85b is enabled, the control device 77 has the rotation It!!t17
When the water level inside reaches the electrode piece 73b and the water surface touches the electrode piece 73b, the first electrode plate 74b, second electrode plate 76b, analog switch 85b, etc. are connected in the same manner as described above. Then, a water level detection signal is inputted, and it is detected that the water level stored in the rotating tank 17 has reached the "middle" position.

In addition, in order to stop the water level stored in the rotary tank 17 due to water supply from the above-mentioned "middle" position where the electrode piece 73b is located and further to the "high" position where the electrode piece 73c is located, an analog signal reception switching circuit is used. Assuming that the switch 85c is enabled, the control device 77 indicates that when the water level stored in the rotating tank 17 reaches the electrode piece 732C and the water surface touches the electrode piece 73c, the rest is the same as described above. A water level detection signal is input through the first electrode plate 74c, the second electrode plate 76C, the analog switch 85c, etc., and indicates that the water level stored in the rotating tank 17 has reached the "high" position. Detected.

In any case, when the required water level is detected, the water supply valve 79 is cut off and closed, and the motor 1 is turned off instead.
4 is normally energized and activated to rotate the agitator 20, thereby starting the washing operation.

Next, the case of discharging the water in the rotating tank 17 will be explained. In this case, after the washing operation or the like is completed, the rotating tub 17 is locked at a fixed position by the locking device described above. That is, as shown in FIG. 3, the drain port 23 and valve mechanism 24 of the rotary tank 17 are opposed to the drive section 29.

Therefore, in this state, the geared motor 36 of the drive unit 29
By applying current, the cam 37 is rotated as shown by the two-dot chain line in FIG. 3, and the push rod 332 is moved upward. As a result, the push rod 32 comes into contact with the lower end of the support rod portion 25a of the valve 25 and pushes it up, opening the drain port 23. As a result, the water in the rotating tank 17 is discharged into the water receiving tank 12 through the drain port 23, and is discharged from the water receiving tank 12 to the outside through the drain hose 16.

When dewatering is performed, the geared motor 36 is turned off or reversely energized to reverse the cam 37 as shown by the solid line and move the push rod 32 downward. As a result, the valve 25 is urged to move downward by the compression coil spring 26, thereby closing the drain port 23. At the same time, by energizing the electromagnet 62, the brake device 47 brings the rotary tank 17 into a non-braking state, and by energizing the electromagnet 69, the lock lever 66 is brought out of engagement with the notch 63a of the brake drum 63. . In this state, the motor 14 is energized to rotate the rotary tank 17 at high speed. As a result, the water contained in the laundry is centrifugally dehydrated in the rotating tub 7, and this water is discharged through the small hole 18 which serves as a dewatering port at the upper end of the rotating tub 17.

Also, rotation +1 for rinsing operation! ! When supplying water within t17, the rotary tank 17 is supplied in the same manner as described above.
Water is supplied after controlling the rotor to rotate to a fixed position and then stop.

In addition, during washing or rinsing, as shown in FIG. (not shown) to the cover member 43 and the rotating tank 17.
The air is sucked into the space between the two and flows toward the back blade 20a. At the same time, water subjected to the pump action of the back blade 20a flows through the space between the cover member 44 and the rotating tank 17 toward the lint filter 44a attached to the upper end of the cover member 44. It has become so.

According to this embodiment having such a configuration, when the rotary tank 17 is stopped at a fixed position, the position detection sensor 42 is provided to output a position detection signal when the rotary tank 17 is rotated to a fixed position, and Rotation 5 While rotating the tank 17 at about 30 rpm, the rotating tank 17 is temporarily stopped at a position, for example, about 10 to 300 mm before the target stop position, based on the position detection signal, and further, after this temporary stop, the rotation is stopped. The tank 17 is rotated at lrpm and is configured to be stopped at a target stop position. Therefore, the rotational speed of the rotating tank 17 can be set to a relatively fast speed of about 3 Orpm in this case until it is temporarily stopped before the target stop position.
As shown in FIG. 10, the rotation tank 17 is slowed by a short rotation distance from the target stop position lrpm.
All you have to do is rotate it. Therefore, the time for rotating the rotating tank 17 at a slow speed can be shortened, and as a result, the time required until it stops can be shortened as a whole. On the other hand, in the case of the above configuration, since it is only necessary to rotate at a slow speed by a small rotation distance, the rotation speed of the rotating tank 17 after the time stop can be set lower. Therefore, the accuracy of the stopping position of the rotating tank 17 can be increased.

Furthermore, in the embodiment described above, the locking device 7o locks the rotating tank 7 at the stop position when the rotating tank 17 is stopped at the target stop position, so that the rotating tank 17 is not in the locked state. The drain port 23 of the rotating tank 17 can be opened and closed by driving the valve mechanism 24 to open and close. Therefore, the valve mechanism 2
Since the rotary tank 17 does not move during the operation of step 4, damage to the valve mechanism 24 can be reliably prevented. In particular, in the above embodiment, after water is supplied into the rotating tank 17, the locking device 7o causes the rotation tI! i] 7 is locked, it is possible to reliably prevent the rotating tub 17 from rotating together during washing and rinsing.

Further, since the rotating tub 17 has a small hole 18 as a dewatering port only at the upper end, water is stored only in the rotating tub 17 during washing. Therefore, since the washing liquid does not accumulate between the water receiving tank 12 and the rotating tub 17, soap scum and the like are not deposited on the inner surface of the water receiving tank 12 and the outer surface of the rotating tub 17. When draining water, the push rod 32 of the drive unit 29 is moved upward to open the valve 25 of the valve mechanism 24, thereby opening the drain port 2.
3 is opened, and the water in the rotating tank 17 is discharged through the drain port 7 23 at the bottom thereof. This prevents a large amount of water from being blown away and hitting the water receiving tank 12 during drainage, and therefore no large noise is generated. When the water in the rotating tank 17 is discharged from the drain port 23 at the bottom, foreign substances such as sand and dirt are also discharged together with the water, so the foreign substances do not accumulate at the inner bottom of the rotating tank 17. disappears. Furthermore, with the rotary tank 17 stopped at a fixed position, the push rod 32 of the drive unit 29 is moved upward to open and close the valve 25 of the valve mechanism 24, so that the opening and closing operations of the valve mechanism 24 are controlled. become certain. Therefore, when draining water, the amount of opening of the drain port 23 is always constant, which stabilizes the drainage performance and prevents the time required for draining from becoming longer or shorter.

Furthermore, in the above embodiment, the drain port 2 is connected from the inside of the rotating tank 17.
Since the structure includes a valve 25 that opens and closes the rotary tank 1
When water is stored in the valve 7, the water pressure acts in the direction of closing the valve 25, so that water retention can be improved. Furthermore, since the rotary tank 17 has a dewatering port (small hole 18) only at the upper end, water is not stored in the water receiving tank 128, so water can be saved. In addition, an electrode piece 73a is provided on the inner surface of the rotating tank 17.
, 73 b, and 73 c are provided at different heights, so that multiple levels of water levels can be detected according to their respective positions, and the optimal water level can be determined depending on the amount of laundry. I can do laundry. Moreover, upon detection, the rotating tank 17 is stopped at a fixed position, and the first electrode plate 7
4a, 74b.

74c and the second electrode plates 76a, 76b, and 76c are configured to face each other to detect the water level.
These electrode plates 74a to 74c and 76a to 76c only need to be provided partially, and do not need to be provided in a large size, such as in an annular shape, so that their size can be kept small. In addition, in this case, when the electrode plate is provided in an annular shape,
Although so-called jump wiring becomes necessary and the wiring process becomes troublesome, this is also not necessary and can be realized with a more rational structure as a whole.

In the above embodiment, the water level is detected in three stages, but it may be detected in a plurality of nine stages, higher or lower. Further, the dewatering port of the rotating tank 17 may be formed not by the small hole 18 formed in the tank wall but by a gap formed between the top end of the tank and the balance ring. Further, in the above embodiment, the water receiving tank 12 and the outer box 11 are separate bodies, but the water receiving tank and the outer box may be used as separate bodies. A rotary tank may be provided with the upper part serving as a water receiving tank, and a drive mechanism such as a motor may be provided in the lower part. Furthermore, although the water level in the rotating tank 17 was detected using the electrode pieces 73a, 73b, and 73c in the above embodiment, the present invention is not limited to this. An ultrasonic receiver may be provided to receive reflected ultrasonic waves, and the height of the water surface in the rotating tank may be detected using ultrasonic waves. In this case,
Control to stop the rotary tank at a fixed position during water supply is no longer necessary, but control to stop the rotary tank at a fixed position may be performed before opening and closing the valve mechanism during draining.

0 In addition, in the above embodiment, when the rotating tank 17 is stopped at a fixed position, the rotating tank 17 is stopped temporarily in front of the target stop position, and then the rotating tank 17 is stopped temporarily before the target stop position.
7 is rotated at a slower speed, but the invention is not limited to this. For example, the rotating tank may be rotated at a slow speed from the beginning, and when the rotating tank reaches the stop position, the rotating tank may be rotated once. It may be made to stop 1- by braking.

In this case, although the time required to stop the rotation may become somewhat longer, the rotating tank can be reliably stopped at the target stop position. Furthermore, in the above embodiment,
A position detection sensor 42 is provided as a rotational position detection means to detect the rotational position of the rotating tank at one location, that is, to output a position detection signal when the rotating tank 17 rotates to the target stop position. Instead, a detection means (for example, a rotary encoder) may be provided to detect the rotational position of the rotating tank at a plurality of locations on the circumference.

FIG. 12 shows a second embodiment of the present invention, and parts different from those in the first embodiment will be described with different reference numerals. In this Fig. 12, the lock lever
Two lock levers 91 and 92 in place of 66 are rotatably supported by a pivot shaft 67 on the case 48 in an overlapping state. Lock claws 91a and 92a are provided as lock portions at the distal ends of the lock levers 91 and 92, respectively. On the other hand, a flange portion 93a having a large vertical dimension is formed at the upper part of the brake drum 93. This collar portion 93a is formed with a notch portion 93b having a large width in the vertical direction as an engaging portion. The lock claws 91a and 92a are adapted to engage with this notch 93b. The lock levers 91 and 92 are connected to the compression coil spring 6.
8 (see Fig. 7), lock claws 91a and 92 are always engaged.
a is rotationally biased in the direction in which it engages with the notch 93b, and is also rotationally driven in the direction in which the engagement between the lock claws 91a and 92a and the notch 93b is released by the electromagnet 69 (see FIG. 7). It is now possible to do so.

In this second embodiment as well, almost the same effects as in the first embodiment can be obtained, but in particular, two lock claws 91a and 92a are engaged with a notch 93b having a large width dimension. Since the structure is configured such that the number of engagement points increases, the strength of engagement increases.

Therefore, when an external force is applied, the lock claws 91a and 9
2a becomes more difficult to come off from the notch 93b, so the rotating tank 17 can be reliably locked.

FIG. 13 shows a third embodiment of the present invention, and parts different from those in the first embodiment will be described with different symbols τj. In FIG. 13, a lock lever 94 in place of the lock lever 66 has two locking parts on the right end side.
Lock claws 94a and 94b are formed. On the other hand, the upper flange of the brake drum 95 has two engaging parts.
Notches 95a and 95b are formed in the locking claws 94a and 95b.
b is engaged.

In this third embodiment as well, substantially the same effects as in the first and second embodiments can be obtained.
5a and 95b, the engagement strength is further increased and locking becomes more reliable.

Further, in the third embodiment, one lock lever 94
Although two lock claws 94a and 94b were formed in the above, a lock lever having one lock claw was used instead.
It is also possible to provide two locking claws that can be rotated independently (for example, at 180 degrees different positions). In this case, even if one of the locking claws becomes disengaged for some reason, the other one Since the lock pawl is engaged, the lock becomes more secure. Further, in the third embodiment, two lock claws 94a, 94b, that is, two lock portions are provided, but three or more lock portions may be provided. in this case,
Of course, three or more lock portions may be provided so as to be independently rotatable.

In each of the above embodiments, the lock levers 66, 91, 92
, 94 are made of metal, but they are not limited to this, and may be formed of resin such as Duracon. In this case, when the lock claw of the lock lever engages with the notch of the brake drum, or when an external force acts in the direction of rotating the rotating tank,
The metal lock pawl may rub against the notch and make a metallic sound, but since the lock pawl is made of resin, this can be prevented from occurring.

[Effects of the Invention] Since the present invention is as explained above, the following effects can be obtained.

In the washing machine according to the first aspect, the rotating tub can be stopped at a target stop position.

In the washing machine according to claim 2, the first stopping means temporarily stops the rotating tub before the target stopping position, and after this temporary stop, the second stopping means causes the rotating tub to rotate at a still slower speed. Since the structure is configured to perform two-step stop control in which the rotating tank is stopped at the target stop position, the rotation speed of the rotating tank is set at a relatively high speed until the rotating tank is temporarily stopped before the target stop position. It is possible to rotate the rotary tank at a slow speed by a short distance from the target stop position. Therefore, the time required to rotate the rotary tank at a slow speed can be shortened, and the time required until it stops can be shortened as a whole. On the other hand, in the case of the above configuration,
If the speed of the rotary tank in the second stage of stop control is set lower, the accuracy of the stop position can be increased.

In the washing machine according to the third aspect, since the rotating tub is locked at the stop position while the rotating tub is stopped at the target stopping position, it is possible to reliably prevent the rotating tub from moving from the stopping position.

In the washing machine according to claim 4, since the plurality of lock portions are configured to engage with the engaging portion on the rotary tub side, the number of engaging portions is increased, the strength of engagement is increased, and the lock portion is engaged with the engaging portion. The rotary tank can be securely locked by making it even more difficult to separate from the rotary tank.

[Brief explanation of drawings]

1 to 11 show a first embodiment of the present invention, in which FIG. 1 is a flowchart, FIG. 2 is a longitudinal cross-sectional view of the whole, and FIG. 3 is a longitudinal cross-section of the bottom of a rotating tank and a water receiving tank. Front view, 4th
The figure is a vertical cross-sectional view of the vicinity of the position detection sensor, Figure 5 is a vertical cross-sectional view taken along line v-v in Figure 4, Figure 6 is a vertical cross-sectional view of the drive mechanism, and Figure 7 is a cross-sectional view of the brake drum section. a bottom view showing the locking device;
Fig. 8 is a perspective view showing the principle of electrode plates etc. for water level detection, Fig. 9 is an electrical configuration diagram, Fig. 10 is a top view showing the rotational position of the rotating tank, Fig. 11(a) , (b) are diagrams showing waveforms of energization to the motor. Further, FIG. 12 is a diagram corresponding to FIG. 6 showing a second embodiment of the present invention. and,
FIG. 13 is a diagram corresponding to FIG. 7 showing a third embodiment of the present invention. In the drawing, 12 is a water tank (outside fl), 17 is a rotating tank, and 4
2 is a position detection sensor (rotational position detection means), 63a is a notch (engaging part), 66a is a lock claw (lock part), 66
91.9 is a lock lever, 70 is a locking device, 77 is a control device (stopping means, first stopping means, second stopping means), 91.9
2 is a lock lever 91a, 92a is a lock claw (lock part), 93b is a notch part (engaging part), 94 is a lock lever 9
4a, 94b are o Tsuku claws (lock part), 95 a
+95b indicates a notch (engaging portion). 7 Japanese Unexamined Patent Publication No. 3 284285 (12) 42 Position detection sensor 1 Chrysanthemum No. 10 Fig. 2 Fig. 1 Fig. 13

Claims (1)

[Scope of Claims] 1. An outer tub, a rotating tub for dehydration and washing rotatably provided in the outer tub, a rotational position detection means for detecting the rotational position of the rotating tub, and the rotating tub. and stopping means for rotating the rotary tub at a speed slower than the rotational speed during spin-drying and braking the rotary tub to stop it at a target stop position based on a rotational position detection signal from the rotational position detection means. Machine. 2. The stop means rotates the rotary tank at a speed lower than the rotation speed during dehydration rotation, and brakes the rotary tank based on the rotation position detection signal of the rotation position detection means, temporarily before the target stop position. a first stopping means for stopping the rotary tank; and after the temporary stop, the rotary tank is further rotated at a slower speed, and the rotary tank is braked based on a rotational position detection signal of the rotational position detection means to stop the rotary tank at a target stop position. 2. The washing machine according to claim 1, further comprising a second stop means for stopping the washing machine. 3. The washing machine according to claim 1 or 2, further comprising a locking device that locks the rotating tub at the stop position when the rotating tub is stopped at a target stopping position. 4. The locking device is provided with a plurality of lock parts displaceably provided on the outer tank side, and the plurality of lock parts are provided on the rotating tank side and engage with each other when the rotating tank is stopped at a target stop position. The washing machine according to claim 3, further comprising an engaging portion.