KR20010106419A - Pulsator system for electric washing machines - Google Patents

Abstract

The stirring device of the electric washing machine includes a drive shaft which protrudes from the bottom surface of the washing tank into the washing tank and rotates under the driving force of the driving motor, a main stirring stirrer fixed to the driving shaft by a central portion, and coaxially with the main stirring stirrer on the main stirring stirrer. A driven stirrer supported to rotate, and controlling the transfer of rotation of the driven stirrer to the driven stirrer according to the magnitude of the laundry load load according to the weight of the laundry put into the washing tank between the main stirrer and the driven stirrer. We install means to do. Thereby, the water flow of the strength corresponding to the amount of laundry is automatically obtained.

Description

Agitator of electric washing machine {PULSATOR SYSTEM FOR ELECTRIC WASHING MACHINES}

First, the structure of what consists of one stirrer in the conventional stirring apparatus is demonstrated. Fig. 11 is a longitudinal sectional view of the electric washing machine equipped with the stirring device. 12 is a sectional view showing only the stirring apparatus in FIG. As shown in Fig. 11, reference numeral 31 denotes an outer housing, in which the water tank 32 is suspended by the dustproof mechanism 33. As shown in FIG. The washing tank 34 is rotatably arranged in the inside of the water tank 32, and the agitator 43 which stirs laundry is arrange | positioned at the inner bottom part of this washing tank 34. As shown in FIG.

On the outer bottom part of the water tank 32, the bearing holder 39 incorporating the dehydration shaft 40 which has the brake mechanism 39b, the deceleration mechanism etc. which are not shown in figure is arrange | positioned. In the drive motor 36 arranged adjacent to the bearing holder 39, its rotation is via the belt 37 and the center pulley 38, and the dehydration shaft 40 and the drive shaft 41 of the bearing holder 39 (FIG. 12). Is passed).

As shown in FIG. 12, the washing tank 34 is fixed to the dehydration shaft 40 with the fixing screw 44. As shown in FIG. Moreover, the drive shaft 41 which the rotation of the drive motor 36 (refer FIG. 11) is transmitted, and rotates similarly to the dehydration shaft 40 protrudes into the washing tank 34, and is fixed by the fixing screw in the upper end part of this drive shaft 41. FIG. The stirrer 43 is screwed by (42).

During the washing operation in this electric washing machine, the brake lever 39c holds the brake mechanism 39b to prevent rotation of the washing tank 34, and only the stirrer 43 rotates. In the dehydration operation, the washing mechanism 34 is rotationally driven by releasing the brake mechanism 39b and switching the clutch mechanism 39a.

As shown in FIG. 11, the drain valve 45 and the drain hose 46 are provided in the drain path from the water tank 32. As shown in FIG. An air trap 47 is formed at the bottom of the water tank 32, and a water level sensor 48 is connected to the air trap 47 via a paint pipe 47a. The water level is detected. This water level sensor 48 is arrange | positioned with the water supply valve 49 in the upper plate 50 of an electric washing machine.

The operation part 51 is arrange | positioned at the front part of the upper surface board 50. As shown in FIG. The control circuit 52 which consists of a microcomputer etc. is arrange | positioned inside it. This operation unit 51 is provided with various switching switches (not shown) and a display device (not shown) for performing various settings related to washing. The control circuit 52 is based on the input signal from the operation unit 51 and the output signal from the water level sensor 48 by the user, according to the built-in program, the water supply valve 49, the drain valve 45, the drive motor. (36) and the like are controlled. In this way, washing processes such as washing, rinsing, and dehydration are automatically executed.

Next, the prior art of the stirring apparatus which consists of several stirrer is demonstrated. This prior art is disclosed in Japanese Patent Laid-Open No. 9-38371, and Fig. 13 is a longitudinal sectional view of the stirring device, and Fig. 14 is a sectional view at C ₁ -C ₂ in Fig. 13. An upper end auxiliary stirrer 350 is fixed to an upper end of the drive shaft 600, and a bottom auxiliary stirrer 310 is fixed to a lower end thereof. An intermediate auxiliary stirrer 330 is rotatably provided with respect to the drive shaft 600 between these stirrers 350 and 310.

When the top auxiliary stirrer 350 and the bottom auxiliary stirrer 310 are rotated by the drive shaft 600, the protrusion 355 of the top auxiliary stirrer 350 and the protrusion 316 of the bottom auxiliary stirrer 310 are formed. Each of the protrusions 335 and 336 of the intermediate auxiliary stirrer 330 is in contact with each other. As a result, the intermediate auxiliary stirrer 330 rotates by following the other stirrers 350 and 310.

In the conventional washing machine equipped with a stirring device, the user selects a course according to the strength of the water and the type of the laundry according to the type and amount of the laundry, and operates the switching switch of the operation unit 51 to wash, rinse, and dehydrate the process. This is done. The intensity of this water flow is determined by the energization and interruption time to the drive motor 36, and is set in advance for each water flow intensity.

However, especially in the recent electric washing machine, so-called short time reversal chart which repeats energization and interruption to the drive motor 36 in an extremely short time is mainstream in order to reduce damage to clothing. In this short time reversal chart, there is no significant difference in the time control of the energization and interruption of the drive motor 36 between the reversal charts of the precipitation and the weak water flow, and thus no water flow suitable for the type and quantity of the laundry can be obtained.

Similarly, the stirring device of Japanese Unexamined Patent Application Publication No. 9-38371 also has a structure in which the intermediate auxiliary stirrer 330 always follows the upper side auxiliary stirrer 350 and the bottom side auxiliary stirrer 310 regardless of the type and amount of laundry. It is. Therefore, no water flow suitable for the type and amount of laundry was obtained.

The present invention relates to a stirring device of an electric washing machine.

1 is a top view of a stirrer of a stirring device according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line A ₁ -A ₂ in FIG. ₁ ; FIG.

FIG. 3 is an enlarged view of the inside of the circle S1 in FIG. 2; FIG.

Fig. 4 is an enlarged view of the inside of circle S2 in Fig. 2;

Fig. 5 is a sectional view of the blade of the driven stirrer at B ₁ -B ₂ in Fig. 1;

Fig. 6 is a diagram showing the dimensions of each part in Fig. 2;

FIG. 7 is a view showing dimensions of each part in a state where the driven stirrer is in a rising position in FIG. 6; FIG.

8 is a block diagram of an electric washing machine provided with the stirring device of the first embodiment.

9 is a rotation timing chart of a drive motor.

10 is a sectional view of a stirring device according to a second embodiment of the present invention.

11 is a sectional view of an electric washing machine with a conventional stirring device.

FIG. 12 is a sectional view of only the stirring device in FIG. 11; FIG.

Fig. 13 is a sectional view of another conventional stirring device.

FIG. 14 is a sectional view taken along C ₁ -C ₂ in FIG. 13; FIG.

According to the present invention, a drive shaft protruding from the bottom surface of the washing tank into the washing tank and rotating under the driving force of the driving motor, a main stirring stirrer fixed to the driving shaft by a central portion, and coaxially with the main stirring stirrer on the main driving stirrer. A driven stirrer supported to rotate, and controlling the transfer of rotation of the driven stirrer to the driven stirrer according to the magnitude of the laundry load load according to the weight of the laundry put into the washing tank between the main stirrer and the driven stirrer. We install means to do.

EMBODIMENT OF THE INVENTION Below, embodiment of this invention is described, referring drawings. First, the stirring apparatus of 1st Embodiment is demonstrated. 1 is a top view of a stirrer in the stirring device of the present embodiment. In addition, Figure 2 is a cross-sectional view of the lower portion of the washing tub in a washing machine provided with the stirrer, there is shown a cross section of the A ₁ -A ₂ in Fig. 1. In addition, the whole structure of an electric washing machine is the same as that of the prior art (refer FIG. 11).

In Fig. 2, reference numeral 1 denotes a washing tank, and a drive shaft 3 through which a driving force is transmitted from the drive motor 36 (see Fig. 11) through a deceleration mechanism (not shown) protrudes inward. The drive shaft 3 may directly use a rotation shaft of the drive motor 36.

Reference numeral 4 is a coarse stirrer, which is fitted to the drive shaft 3 via a spacer 5 and is fixed with a screw 6 and is made of a cylindrical body in a central portion with a stepped portion 4e in the middle thereof. (4a), the disk part 4b which is formed extending from the fitting part 4a to the outer side of the diameter, and has the step part 4c in an intermediate part, and the upper surface of this disk part 4b at equal intervals. It consists of four blades 4d formed. On the edges around the upper end of the fitting portion 4a, a plurality of engaging members 4f composed of different parts protrude and are arranged, and a fall prevention hook 4g is formed at the tip thereof. In addition, the washer 9 is fitted to the fitting portion 4a, and is locked on the stepped portion 4e.

Reference numeral 7 is a driven stirrer formed by injection molding a synthetic resin material having a specific gravity that is lighter than water such as polypropylene, and has a small diameter portion 7c at the lower end portion and a large diameter at the upper end portion so as to form a contact step portion 7b in the middle portion. A coupling cylinder member 7a in which a stepped cylindrical body composed of a portion 7d and a small diameter portion 7c is fitted to the coupling member 4f of the main stirrer 4 so as to rotate and move up and down, and the coupling cylinder member A disk portion 7e that extends from the large diameter portion 7d of the upper end portion of the upper end portion 7d toward the outside of the diameter and is gradually inclined downward, and five blades 7f formed at equal intervals on the upper surface of the disk portion 7e. Consists of

The driven stirrer 7 is inserted into the stepped portion 4c on the disc portion 4b of the driven stirrer 4 so that the peripheral edge portion 7g of the driven stirrer 7 has a gap with the stepped portion 4c. Lost Therefore, the driven stirrer 7 can rotate independently from the main stirrer 4. In the present embodiment, four blades 4d of the main stirrer 4 and four blades of the driven stirrer 7 Although 5 pieces of 7f) are installed, any number of blades can be used as long as the water flow can be effectively formed.

As described above, the small diameter portion 7c of the coupling cylinder member 7a of the driven stirrer 7 is fitted to the coupling member 4f of the driven stirrer 4 so as to be movable up and down. FIG. 3 is an enlarged view of the vicinity (in circle S1 in FIG. 2) of the engaging member 4f of the coarse stirrer 4 and the engaging cylinder member 7a of the driven stirrer 7. In this way, the range in which the driven stirrer 7 can move up and down with respect to the main stirrer 4 is between the dimensions h ₁ . In the state where the driven stirrer 7 is most lowered, as shown in Fig. 2, the small diameter portion 7c of the lower end portion of the coupling cylinder member 7a is in contact with the upper surface of the washer 9. In addition, in the most elevated state, the contact step 7b is locked to the anti-hook 4g of the engaging member 4f, and the detachment from the engaging member 4f is prevented.

Reference numeral 4h denotes a rotary lock protrusion protruding from the inner side of the stepped portion 4c on the disk portion 4b near the stepped portion 4c, and formed on the lower surface of the disk portion 7e of the driven stirrer 7. The rotation transmission means is constituted together with one rotation lock rib 7h. When the driven stirrer 7 is in the lowered position where the small diameter portion 7c of the coupling cylinder member 7a is in contact with the upper surface of the washer 9, the rotating lock protrusion 4h is rotated by rotating the main stirrer 4. The rotary lock ribs 7h are in contact (coupled state).

FIG. 4 is an enlarged view of the vicinity (in circle S2 in FIG. 2) of the rotary lock protrusion 4h of the coarse stirrer 4 and the rotary lock rib 7h of the driven stirrer 7. In this way, the engagement range h _{2 of the} rotary lock protrusion 4h with respect to the rotary lock rib 7h is smaller than the vertically moving distance h ₁ (see FIG. 3) of the driven stirrer 7. Therefore, even when the driven stirrer 7 is in the lifted position where the contact step 7b is locked to the fall prevention hook 4g, even if the main stirrer 4 is rotated, the rotary lock protrusion (7h) is rotated. 4h) does not contact (departure state).

As shown in Fig. 2, a plurality of holes 4i, ... are drilled in the disc portion 4e of the coarse stirrer 4 inside the diameter than the step portion 4c. The water supplied to the washing tank 1 penetrates between the stirrers 4 and 7 from the gap between this hole 4i and the main stirring stirrer 4 and the driven stirrer 7.

FIG. 5 is a cross-sectional view of the blade 7f of the driven stirrer 7 and shows a cross section at B ₁ -B ₂ in FIG. ₁ . Thus, since the blade 7f of the driven stirrer 7 is formed so that it may have the space 7i inward, air is sealed in the space 7i by the water which penetrated between the agitators 4 and 7. .

And since the driven stirrer 7 is formed from the material which is lighter in specific gravity than water, the driven stirrer 7 which was in the lowered position by self weight floats in water and rises along the coupling member 4f with the water level. Here, although the material of the driven stirrer 7 and the shape of the blade 7f are made to float in water, the driven stirrer 7 can fully float by using only one structure.

Since the blade 7f of the driven stirrer 7 is formed above the blade 4d of the main stirrer 4, the laundry put into the washing tank 1 is first loaded with the driven stirrer 7. Accordingly, when the amount of the laundry is large, the driven stirrer 7 does not rise but stays in the lowered position due to the load of the laundry even when water is supplied to the washing tank 1. Therefore, both stirrers 4 and 7 are brought into a coupled state, and when the main stirrer 4 rotates, the rotary lock protrusion 4h contacts the rotary lock rib 7h, and the driven stirrer 7 also rotates together.

In addition, when the amount of laundry is small, the driven stirrer 7 floats in water and reaches an ascending position. Therefore, since both stirrers 4 and 7 are in a detached state, only the driven stirrer 4 rotates without rotational force being transmitted to the driven stirrer 7.

In this embodiment, since the rotary lock rib 7h and the rotary lock protrusion 4h are formed in only one site | part in the circumferential direction of both stirrers 4 and 7, respectively, the driven stirrer 7 is attached to the main stirrer 4, and so on. When rotating in rotation, the rotation is delayed slightly less than one rotation of the main stirrer 4 until the rotation lock projection 4h comes in contact with the rotation lock rib 7h. Then, it rotates at the same period as a main stirrer. Moreover, you may form several rotation lock protrusion 4h or rotation lock rib 7h, and may reduce the amount of this parallax start.

In addition, reference numeral 8 denotes a cap member which is attached to the upper end of the coupling cylinder member 7a in order to close the upper surface opening of the coupling cylinder member 7a of the driven stirrer 7, The lower end portion is vertically lowered below the engaging member 4d of the coarse stirrer 4. As shown in Fig. 3, the gap w ₁ between the cylindrical portion 8a and the engaging member 4f is formed smaller than the width w ₂ of the fall preventing claw 4g. Thereby, even if the deformation | transformation which seems to be inclined to the inside of diameter of the engagement member 4f contacts the cylinder part 8a, the deformation | transformation is prevented, and the driven stirrer 7 is prevented from being separated from the main stirrer 4, Can be.

Moreover, the shape of the blade 7f of the driven stirrer 7 is formed so that the shape of the space between them may become V-shape with the shape of the blade 4d of the main stirrer 4 as shown in FIG. . This is to prevent the laundry from being caught between the two blades 4d and 7f.

In the stirring apparatus of this embodiment, the outer diameter dimension (diameter) of the coarse stirring machine 4 is made the same outer diameter dimension as the stirrer of a general electric washing machine. At this time, the outer diameter dimension of the driven stirrer 7 should just be 1/4 to 1/2 of the outer diameter dimension of the main stirrer 4. Accordingly, the stirring device can correspond to electric washing machines of various capacities.

As an example of the electric washing machine provided with this stirring apparatus, the dimension of each part about the capacity of the washing tank 1 being 4.5-7 kg is shown below. This part is shown in Figs. 6 and 7, and Fig. 6 is a sectional view showing a state in which the driven stirrer 7 is in the lowered position, and Fig. 7 shows a state in which the driven stirrer 7 is in the up position. It is a cross section.

In Figure 6,

Outer diameter (L1) of the coarse stirrer 4: 280 to 360 mm (capacity 4.5 to 7 kg),

Outer diameter L2 of the driven stirrer 7: 1/4 to 1/2 of L1,

to be. The outer diameter L1 of the coarse stirrer 4 changes gradually with the capacity (4.5-7 kg) of the washing tank 1. If the outer diameter L2 of the driven stirrer 7 is sized according to the outer diameter L1 of the main stirrer 4 as mentioned above, an appropriate water flow can be formed.

6,

Gap L3 between the main stirrer 4 and the driven stirrer 7: 1.5 to 3.5 mm,

Difference in height (L4) between the main stirrer 4 and the driven stirrer 7: 0 to 15 mm,

Height L5 from the contact stepped portion 7b to the fall prevention hook 4g: 8 mm

Internal diameter L6 of the washing tub 1: 360 to 500 mm,

to be. In Figure 7,

Height L7 of the blade 4d of the coarse stirrer 4: 25 to 45 mm,

Difference in height (L8) between the main stirrer 4 and the driven stirrer 7: L4 + (5 to 30),

to be.

The height L5 from the gap L3 between the main stirrer 4 and the driven stirrer 7 and the contact preventing step 7b to the fall prevention hook 4g represents a suitable dimension (range) in the case of the above capacity. have.

Moreover, it is preferable to satisfy said L4 and L8 about the height of the driven stirrer 7. If the driven stirrer 7 is too high, the load on the drive motor 36 (see Fig. 11) becomes large due to the resistance received from the water and the laundry. And if the driven stirrer 7 is too high, the laundry in the center side of the washing tank 1 will come into contact with the driven stirrer 7 more easily, and it will be easier to rotate than the laundry in the outer side, and the laundry will be rained on the center side and the outside. Wrong entanglement occurs. When the driven stirrer 7 is too low, the laundry on the outside is more likely to rotate than the laundry on the center side in the same way as a conventional stirrer, and twisting occurs in that portion. This entanglement causes damage to the laundry. However, if the driven stirrer 7 satisfying the L4 and L8 does not cause a difference in the degree of rotation of the laundry twisted from the center side and the outside, the laundry is difficult to get entangled and does not cause problems such as damage.

In addition, the height L7 of the blade 4d of the main stirrer 4 is not related to the said capacity | capacitance, and is a value which can form water flow efficiently with respect to the capacity | capacitance of a general electric washing machine. In addition, in the said main stirring stirrer 4 and the driven stirrer 7, the cross-sectional thickness is 2-3.5 mm. In this case, the cross-sectional thickness is 3.5 mm at the upper portion of the stirrer which frequently contacts the laundry, the fitting portion of the drive shaft 3 under high force, and the thinnest portion is 2 mm.

The operation of the washing operation in the electric washing machine with the stirring device according to the first embodiment will be described with reference to FIGS. 2, 8, and 11. 8 is a block diagram of the electric washing machine. In the state where water is not supplied to the washing tank 1 and no laundry is put, the driven stirrer 7 is in the lowered position along the coupling member 4f due to its own weight.

In the non-use state, when the user washes, the user puts laundry into the washing tank 1 and operates the operation unit 51 to start the washing operation. When the signal of washing start is output from the operation part 51, the control circuit 52 opens the water supply valve 49 and starts pouring water. This water starts to accumulate gradually from the bottom surface of the washing tank 1 below the main stirrer 4, and enters the space between the main stirrer 4 and the driven stirrer 7 as the water level rises.

At this time, if the amount of laundry is small, the driven stirrer 7 starts to rise along the coupling member 4f due to the buoyancy of water. When water is pumped up to a predetermined level, the water level sensor 48 operates to close the water supply valve 49, and together with the driving motor 36, the energization of the drive motor 36 is started through the drive circuit 53 to start the washing operation.

By the drive of the drive motor 36, its rotation is transmitted to the deceleration mechanism (not shown) in the bearing holder 2 via the belt 38 (see FIG. 11) and the center pulley 39 (see FIG. 11). It is transmitted to rotate the drive shaft (3). At this time, since the rotary lock rib 7h and the rotary lock protrusion 4h are in a detached state due to the rise of the driven stirrer 7, only the main stirrer 4 is rotated to stir the laundry with weak water flow.

On the other hand, if the amount of the laundry is large, buoyancy acts on the driven stirrer 7 when water is poured, but the driven stirrer 7 does not rise against the buoyancy due to the weight of the laundry, and the rotary lock rib 7h and the rotary lock The projection 4h remains in the engaged state. As a result, the rotation of the driven stirrer 4 is transmitted to the driven stirrer 7 via the rotary lock ribs 7h and the rotary lock protrusion 4h, and the driven stirrer 7 rotates together with the driven stirrer 4, Stir the laundry with a strong stream of water.

At this time, since the rotary lock protrusion 4h and the rotary lock rib 7h are located at intervals in the rotational direction on the circumferences of the stirrers 4 and 7, respectively, the rotation start of the driven stirrer 7 according to the combination of both is started. Starts with a delay of the interval from the start of rotation of the coarse stirrer 4. By the differential start of the driven stirrer 7 with respect to the main stirrer 4, the laundry is twisted between the two stirrers 4 and 7 to obtain the effect of hand washing, thereby improving the washing power.

When the washing operation is finished, the control circuit 52 opens the drain valve 45 to discharge water from the drain hose 46 (see Fig. 11) to the outside of the electric washing machine. The holes 4i, ... serve to infiltrate water between the coarse stirrer 4 and the driven stirrer 7 when pouring water, but between the two stirrers 4, 7 when draining the water of the washing tank 1. It plays a role of flowing the garbage and seams that enter the space.

In the above-described washing operation, when the amount of the laundry is large and both stirrers 4 and 7 are rotated at the same time to operate with strong water flow, the laundry floats or shifts outward due to the water flow. Therefore, since the load to the driven stirrer 7 is reduced, the driven stirrer 7 rises and becomes out of the main stirrer 4, and a problem arises that the driven stirrer 7 does not rotate. Therefore, in the stirring apparatus of this embodiment, when the driven stirrer 7 detached | deviated from the coarse stirring stirrer 4, it can be brought into the engaged state again.

9 shows a rotation timing chart of the drive motor 36. As shown in the rotation timing chart (a), the coarse stirrer 4 is rotated alternately in the forward and reverse directions by the drive motor 36, and the drive motor 36 is driven by the forward rotation drive of the coarse stirrer 4; There is a stop time between the reverse rotation drive. During this pause time, the coarse stirrer 4 rotates in the previous rotational direction by inertia.

When the drive motor 36 is a DC brushless motor, the rotation detecting means 54 shown in Fig. 8 outputs pulses from the Hall element of the drive motor 36 in accordance with the rotation of the coarse stirrer 4 during the stop time. do. This pulse is counted by a counter in the control circuit 52.

When the driven stirrer 7 is separated from the main stirrer 4, the load of the main stirrer 4 is reduced, so that the rotational speed due to this inertia increases. That is, the number of pulses within a predetermined time counted by the control circuit 52 also increases. Accordingly, in the control circuit 52, it is determined that the driven stirrer 7 is in a state of being separated from the main stirrer 4.

When the deviation state is detected, the control circuit 52 slows down the rotation speed of the drive shaft 3 by the drive motor 36 through the drive circuit 53. As a result, the flow of water slows down, and the laundry falls on the driven stirrer 7. Accordingly, the driven stirrer 7 is lowered again by the weight of the laundry, is brought into engagement with the main stirrer 4, and rotates together.

In this case, in order to bring the driven stirrer 7 which has been separated from the main stirrer 4 into the main stirrer 4 again, the rotational speed of the drive shaft 3 is slowed down. good. That is, when it is determined by the control circuit 52 that the driven stirrer 7 has moved away from the main stirrer 4, the control circuit 52 controls the rotation period of the drive shaft 3 to change it to a different one from the normal rotation period. Way.

For example, as shown in the rotation timing chart (b) shown in Fig. 9, when the forward and reverse rotation time is shortened with respect to the normal rotation timing chart (a), the vortex is broken by the water flow reversed in a short time, and the laundry is driven by the stirrer. (7) Falls onto the top. In addition, if the pause time is lengthened as shown in the rotation timing chart c, the laundry falls on the driven stirrer 7 during the pause time. Accordingly, the driven stirrer 7 is lowered again by the weight of the laundry, and is brought into engagement with the main stirrer 4.

Moreover, you may use the method of releasing the fixation of the washing tank 1 by the brake mechanism 39b. In other words, the washing tank 1 is fixed by the brake mechanism 39b so as not to rotate during the washing operation. When it is determined by the control circuit 52 that the driven stirrer 7 has moved away from the main stirrer 4, the fixing of the washing tank 1 by the brake mechanism 39b is released and the rotation of the main stirrer 4 which has been reversed is performed. The direction is rotated in one direction only. As a result, the washing tank 1 rotates in the same direction following the water flow and the laundry, and thus becomes a relatively weak water flow, and the laundry falls on the driven stirrer 7.

As described above, in the stirring device of the first embodiment, water flow corresponding to the amount of laundry is automatically obtained by controlling the rotation of the driven stirrer 7. Therefore, it is very convenient and functional. In addition, when the driven stirrer 7 is rotated and washed with strong water flow, a problem arises that the rotation of the driven stirrer 4 cannot be transmitted to the driven stirrer 7 because the laundry is suspended by water flow or shifted outward. Even if it detects this and automatically returns to the original state, strong water flow can be obtained stably and performance is good.

Next, the stirring apparatus of 2nd Embodiment which differs in some structures from 1st Embodiment is demonstrated. FIG. 10 is a sectional view of the electric washing machine provided with the stirring device, and corresponds to FIG. 2 in the first embodiment. A thrust washer 11, a spring 10, and a thrust washer 11 ′ are fitted to the drive shaft 3 sequentially from the lower side between the main stirrer 4 and the driven stirrer 7. Moreover, the cover 12 is provided so that the outer side of the spring 10 may be covered. The cover 12 does not cause a problem such as the waste of garbage and seams wrapped around the spring 10.

The lower surface of the lower thrust washer 11 is in contact with the upper surface of the disc portion 4b of the coarse stirrer 4, and the upper surface of the upper thrust washer 11 ′ is coupled to the coupling cylinder member of the driven stirrer 7 ( The small diameter part 7c of the lower end part of 7a) is in contact. A position where the driven stirrer 7 is freely moved up and down by the spring 10, that is, the contact step 7b of the driven stirrer 7 is locked to the fall preventing hook 4g of the driven stirrer 4. It is supported in the state.

When a large amount of laundry is put into the washing tank 1, the driven stirrer 7 is lowered against the spring 10 by the weight. Since the driven stirrer 7 does not float due to the weight of the laundry even when water is supplied to the washing tank 1, the driven stirrer 7 is engaged with the main stirrer 4, and both stirrers 4 and 7 rotate together. do. In the case where a small amount of laundry is used, the driven stirrer 7 is not lowered while being supported by the spring 10. Therefore, the driven stirrer 7 is separated from the main stirrer 4, and when the washing operation is performed, the driven stirrer ( 4) Only rotate.

That is, in the first embodiment, the driven stirrer 7 in a coupled state is configured to float in water when the amount of laundry is small. In the present embodiment, the driven stirrer 7 is supported in a detached state. When the amount of laundry is large, it is set as the structure which descends naturally. In addition, the structure and operation | movement operation other than this are the same as that of 1st Embodiment. In addition, in this embodiment, although the blade 7f of the driven stirrer 7 is made into the shape which has space inside, it is not limited to this, Any shape may be sufficient.

As described above, in the stirring device according to the present invention, the rotation of the driven stirrer is controlled according to the magnitude of the laundry load load according to the weight of the laundry, so that when the laundry is large, washing can be performed with strong water flow, and when the laundry is small. Washing can be performed with a weak stream of water, and a stream of strength of strength according to the amount of laundry is automatically obtained. In addition, since the diameter of the driven stirrer was made into 1/4 to 1/2 of the diameter of the main stirrer, it can be applied to any electric washing machine of a general standard. Moreover, when the shape between the main stirrer and the blades of the driven stirrer is substantially V-shaped, problems such as laundry pinching do not occur. In addition, even if a problem arises that the transmission of the rotation to the driven stirrer is not caused by the strong water flow, by detecting it and weakening the water flow, the rotation is transferred to the driven stirrer again automatically, so that the operation is always stable. Can be done. In addition, by providing the cover on the elastic member which is the rotation transmission means, problems such as entanglement of garbage and seams in the water with the elastic member do not occur. Therefore, it is useful when applied to an electric washing machine.

Claims (12)

A drive shaft which protrudes from the bottom of the washing tank into the washing tank and rotates under the driving force of the driving motor, a coarse stirrer fixed by a central portion to the drive shaft, and which is supported to rotate coaxially with the coarse stirrer on the coarse stirrer. And a means for controlling the transfer of rotation of the driven stirrer to the driven stirrer according to the magnitude of the laundry load load according to the weight of the laundry put into the washing tank between the main stirrer and the driven stirrer. An agitating device for an electric washer, characterized in that. 2. The stirring device according to claim 1, wherein the diameter of the driven stirrer is set to 1/4 to 1/2 of the main stirrer. 2. The stirring device according to claim 1, wherein the shape between the blade of the main stirrer and the blade of the driven stirrer is approximately V-shaped. The stirring device of the electric washing machine according to claim 1, wherein the rotation of the driven stirrer is started later than the rotation of the main stirrer. 5. A means according to claim 4, wherein detection means for detecting the presence or absence of transmission of rotation from said main stirrer to said driven stirrer is provided, and means for controlling the rotational speed of said drive shaft according to the presence or absence of said transmission by the output of said detection means. Stirring device of an electric washer, characterized in that the installation. 5. A means according to claim 4, wherein detection means for detecting the presence or absence of transmission of rotation from said main stirrer to said driven stirrer is provided, and means for controlling the rotation period of said drive shaft in accordance with the presence or absence of said transmission by the output of said detection means. Stirring device of an electric washer, characterized in that the installation. 5. The fixing apparatus according to claim 4, further comprising: fixing means for fixing the washing tank so as not to rotate, and detecting means for detecting the transmission of rotation from the main stirring stirrer to the driven stirrer, wherein the detecting means rotates from the main stirring stirrer. The stirring device of the electric washing machine characterized by releasing the fixing by the fixing means when it is detected that it is not transmitted. The elastic member according to claim 4, wherein the driven stirrer is supported to be movable up and down with respect to the drive shaft, and the means for controlling the transmission of rotation of the main stirrer to the driven stirrer is an elastic member supporting the driven stirrer at an elevated position. And rotation transmission means for transmitting the rotation of the main stirrer to the driven stirrer when the driven stirrer is in the lowered position. The stirring device of an electric washing machine according to claim 8, wherein a cover is provided on an outer side of the elastic member. 10. The stirring apparatus of claim 9, wherein the rotation transmission means comprises a rib formed on one of an upper surface of the main stirrer and a lower surface of the driven stirrer and a protrusion formed on the other side. A drive shaft which protrudes from the bottom of the washing tank into the washing tank and rotates under the driving force of the driving motor, a main stirring stirrer fixed to a fitting portion in the center of the driving shaft, and on the main driving stirrer, the main driving shaft can rotate coaxially with the main stirring stirrer; And a driven stirrer made of a material having a specific gravity smaller than that of the water supported to move up and down, and rotation transmission means for transmitting the rotation of the main stirrer to the driven stirrer when the driven stirrer is in the lowered position. The stirrer moves up and down according to the magnitude of the laundry load load according to the weight of the laundry put into the washing tank, and receives the rotational force of the main stirrer through the rotation transmission means when the laundry load load is large and is in a lowered position. Electric, characterized in that configured to rotate together Stirring device in the washing machine. A drive shaft which protrudes from the bottom of the washing tank into the washing tank and rotates under the driving force of the driving motor, a main stirring stirrer fixed to a fitting portion in the center of the driving shaft, and on the main driving stirrer, the main driving shaft can rotate coaxially with the main stirring stirrer; And a driven stirrer supported to move up and down, and rotation transfer means for transmitting rotation of the main stirrer to the driven stirrer when the driven stirrer is in a lowered position, wherein the driven stirrer includes a space for storing air. It moves up and down according to the magnitude of the laundry load load according to the weight of the laundry to be put into the washing tank, and when the laundry load load is large and receives the rotational force of the main stirrer via the rotation transmission means when the load load is lowered Electric laundry, characterized in that configured to rotate together Of the stirrer.