JP2002000991A - Washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a washing machine in which a mechanism for linking detachably a tub shaft and a pulsator shaft is structured so as to be manufactured inexpensively, and not to require complicated control and not to produce a large sound during driving. SOLUTION: In a washing machine equipped with a washing and dehydration tub 5, a hollow tub shaft 15, the upper end of which is fixed to the bottom of the washing and dehydration tub, a pulsator shaft 18 internally rotatably mounted to the tub shaft, a pulsator 8 fixed to the upper end of the pulsator shaft, a motor 24 rotating the pulsator shaft, and a mechanism detachably linking the tub shaft and the pulsator shaft, the mechanism, threads 15c and 18b provided in the inside periphery of the tub shaft and the outside periphery of the pulsator shaft, a regulating member 34 disposed at the lower end of the pulsator shaft, coming into contact with and separating from the lower end of the tub shaft in a state of butting the lower end of the tub shaft, in accordance with the rotation of the pulsator shaft disposed at the lower end of the pulsator shaft and preventing the pulsator shaft from moving upward with respect to the tub shaft.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a fully automatic washing machine provided with a pulsator.

[0002]

2. Description of the Related Art FIG. 7 is a side sectional view showing an example of a fully automatic washing machine having a conventional pulsator. In FIG. 1, reference numeral 1 denotes a box-shaped washing machine main body having an opening 1 a on an upper surface, and a bottomed cylindrical water tank 4 is suspended through a hanging rod 2 and a vibration absorbing spring 3 inside the main body. A cylindrical bottomed washing and dewatering tub 5 is provided inside the water tub 4, and a balance ring 6 is attached to a peripheral edge of an upper end thereof, and a pulsator 8 is disposed at a bottom of the washing and dewatering tub 5. Have been.
Reference numeral 7 denotes a lid that opens and closes the opening 1a of the main body 1 of the washing machine.

A control circuit 9 is provided on the inner surface of the top plate of the main body 1 of the washing machine, and controls a series of washing operations such as a washing process, a rinsing process, and a dehydrating process. Reference numeral 10 denotes a drive mechanism attached to the bottom of the water tub 4 for driving the washing and dewatering tub 5 and the pulsator 8. This drive mechanism 10
As shown in FIG. 8, the upper support member 12 and the lower support member 1
3 is provided.

The upper support member 12 is formed by processing a plate material, is supported by a column 4a provided on the bottom surface of the water tank 4, and has a cylindrical bearing portion 12a at the center thereof. . The lower support member 13 is also formed by processing a plate material, and has a cylindrical bearing portion 13 formed at the center thereof.
a. Upper support member 12 and lower support member 13
Are positioned so that the bearing portion 12a and the bearing portion 13a are coaxial, and are fixed to each other by screws 14a.

A hollow cylindrical tank shaft 15 is inserted into the bearings 12a and 13a of the support member 11 formed as described above.
And rotatably supported around the axis. The tank shaft 15 penetrates the bottom wall of the water tank 4 and has a flange 15a at its upper end.
And is fixed to the bottom surface of the washing and dewatering tub 5 by the flange portion 15a.

A pulsator shaft 18 is coaxially mounted inside the tank shaft 15 so as to be rotatable around the axis. Both ends of the pulsator shaft 18 project from the tank shaft 15 and the upper end is fixed to the pulsator 8. Further, the tank shaft 15 has a plurality of engagement teeth 15b on the outer periphery of the lower end. This engagement tooth 1
5b are linearly provided so as to extend in the axial direction at equal intervals over the entire outer periphery of the lower end of the tank shaft 15.

Reference numeral 19 denotes a support frame made of a cylindrical member having an open top and bottom, which is fixed to the lower surface of the support member 13 with screws 14b. Reference numeral 20 denotes a clutch boss fixed to the outer peripheral portion of the lower end of the pulsator shaft 18 immediately below the tank shaft 15 in the support frame 19, having the same outer diameter as the lower end of the tank shaft 15 and having the outer peripheral portion thereof. Like the lower end of the tank shaft 15, a plurality of engagement teeth 20a are provided in the entire circumference at equal intervals in the circumferential direction and linearly along the axial direction.

Reference numeral 21 denotes a cylindrical moving body formed of a magnetic material, which is fitted to the tank shaft 15 and the clutch boss 20 so as to be able to slide up and down along the outer periphery of the lower end of the tank shaft 15 and the outer periphery of the clutch boss 20. I agree. That is, the moving body 21
Has a plurality of engaging teeth (not shown) extending vertically on an inner peripheral portion thereof, and the engaging teeth are formed on an outer peripheral portion of a lower end of the tank shaft 15 and an outer peripheral portion of the clutch boss 20. 15 teeth
The moving body 21 is guided in the vertical direction, and the tank shaft 15 and the pulsator shaft 18 are connected to each other.

Reference numeral 22 urges the moving body 21 upward, and the tank shaft 1
5 is a spring that meshes with the fifth engaging tooth 15b. 2
Numeral 3 denotes an electromagnetic solenoid, which is energized to move the moving body 21.
Moves downward against the urging force of the spring 22, disengages from the engagement teeth 15 b of the tank shaft 15, meshes with only the engagement teeth 20 a of the clutch boss 20, and the tank shaft 15 and the pulsator shaft 18 The connection is released. Electromagnetic solenoid 23
When the power supply is cut off, the moving body 21 moves upward by the spring 22 and meshes with the engaging teeth 15b of the tank shaft 15 and the engaging teeth 20a of the clutch boss 20, so that the tank shaft 15 and the pulsator shaft 18 are connected. Be linked.

At the lower end of the pulsator shaft 18, a rotor 25 is fixed. The rotor 25 is formed in an annular shape and fixed to the pulsator shaft 18 via a nut 27.
8 is fixed via bolts 30 and nuts 31 and is disposed concentrically with the pulsator shaft 18. An annular stator 26 concentrically arranged around the rotor 25 is fixed to the lower support member 13 via bolts 32 and nuts 33. The rotor 25 and the stator 26
Motor 2 for rotating and driving pulsator shaft 18 and tank shaft 15
4 are formed.

During the washing process in which the pulsator 8 is rotated, the electromagnetic solenoid 23 is energized, and the moving body 21 moves downward and disengages from the engagement teeth 15b of the tank shaft 15. When the motor 24 is driven in this state, only the pulsator shaft 18 rotates and the pulsator 8 rotates. Also, during the spin-drying process in which the washing and spin-drying tub 5 is rotated, the electromagnetic solenoid 23 is used.
And the moving body 21 moves upward to engage the engagement teeth 15b of the tank shaft 15 and the engagement teeth 20 of the clutch boss 20.
meshes with a. When the motor 24 is driven in this state, the rotating force applied to the pulsator shaft 18 by the motor 24 is transmitted to the tub shaft 15 via the moving body 21, and the tub shaft 15 rotates together with the pulsator shaft 18 to rotate the tub 5. And the pulsator 8 rotates.

[0012]

In the above-mentioned conventional washing machine, the mechanism for removably connecting the tub shaft 15 and the pulsator shaft 18 is connected to the clutch boss 20, the moving body 21, the electromagnetic solenoid 23, and the tub shaft 15. Since it is constituted by the formed engaging teeth 15b and the like, there is a problem that the cost is high.

When the moving body 21 disengaged from the engaging teeth 15b of the tank shaft 15 is engaged with the engaging teeth 15b again, the engaging teeth of the moving body 21 and the engaging teeth 15b of the tank shaft 15 mesh with each other. Must be positioned exactly as
There was a problem that complicated control was required.

Further, there is another problem that a loud collision sound is generated when the moving body 21 moves.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its object to provide a mechanism for connecting a tank shaft and a pulsator shaft in a detachable manner, which can be manufactured at low cost, and which requires complicated control. It is an object of the present invention to provide a washing machine that does not require a washing machine and is configured not to generate a loud noise during driving.

[0016]

According to a first aspect of the present invention, there is provided a washing and dewatering tub, and a hollow tub shaft having an upper end fixed to the bottom of the washing and dewatering tub. A pulsator shaft which is coaxially mounted on the tub shaft and is rotatable around the axis, and both ends of which are projected from the tub shaft and whose upper end projects into the washing and dewatering tub; A washing machine comprising: a pulsator fixed to an upper end of a shaft; a motor for rotating the pulsator shaft; and a mechanism for connecting the tank shaft and the pulsator shaft so as to be freely disengageable and transmitting a rotational force therebetween. Wherein the mechanism is provided on an inner peripheral portion of the tank shaft and an outer peripheral portion of the pulsator shaft. When the pulsator shaft is rotated with respect to the tank shaft, the pulsator shaft moves in the axial direction with respect to the tank shaft. Formed to Threaded portion, the pulsator shaft provided at the lower end of the pulsator shaft comes into contact with and separates from the lower end of the tank shaft with the rotation of the pulsator shaft with respect to the tank shaft and contacts the lower end of the tank shaft. And a regulating member that prevents the tank from moving upward with respect to the tank axis.

According to such a configuration, when the pulsator shaft is rotated in both directions with the regulating member separated from the lower end of the tub shaft, only the pulsator rotates and the laundry in the washing and dewatering tub is agitated. . Further, when the pulsator shaft is rotated in a direction to move upward with respect to the tank shaft while the regulating member is in contact with the lower end of the tank shaft, the bath shaft rotates integrally with the pulsator shaft, and the washing and dewatering tub and The pulsator rotates. The mechanism of the present invention for detachably connecting the tank shaft and the pulsator shaft can be formed at a low cost, and the connection or disconnection of the pulsator shaft and the tank shaft can be achieved simply by rotating the pulsator shaft in either direction. Since it can be performed, complicated control is not required and reliability is high. Further, since the regulating member is in contact with the tank shaft or the like while rotating, the collision noise is small.

According to a second aspect of the present invention, in the first aspect, a pair of bearings are attached to the tank shaft so as to sandwich the screw portion and rotatably support the pulsator shaft. Is what you do.

In this case, since the load applied to the screw portion is reduced, the pulsator shaft can be smoothly rotated with respect to the tank shaft.

According to a third aspect, in the second aspect, lubricating grease is filled between the pair of bearings.

In this case, since the grease can be prevented from flowing out by the pair of bearings, the pulsator shaft can be smoothly rotated for a long period of time.

According to a fourth aspect of the present invention, in the first aspect, a portion around the pulsator on the bottom inner surface of the washing and dewatering tub is defined by a lower end of a peripheral portion of the pulsator when the pulsator is at an upper end position. It is formed so as to be located at the same height or above the lower end of the peripheral portion.

In this case, it is possible to prevent the laundry from being caught between the lower end of the peripheral portion of the pulsator and the portion around the pulsator on the inner surface of the bottom of the washing and dewatering tub due to the vertical movement of the pulsator during the washing process. Can be.

According to a fifth aspect, in the first aspect, the motor comprises a rotor fixed to the pulsator shaft, and a stator disposed around the rotor. The length of the rotor in the axial direction of the pulsator shaft is longer than the length of the stator in the axial direction of the pulsator shaft by the moving stroke of the rotor or more, so that the facing area between the rotor and the stator is constant. It is characterized by being enlarged.

In this case, the torque characteristics of the motor can be made constant regardless of the position of the rotor.

In a sixth aspect based on the first aspect, the motor comprises a rotor fixed to the pulsator shaft, and a stator disposed around the rotor, and the motor is connected to the position of the rotor. The length of the stator in the axial direction of the pulsator shaft is longer than the length of the rotor in the axial direction of the pulsator shaft by the moving stroke of the rotor or more, so that the facing area of the rotor and the stator is constant. It is characterized by being enlarged.

In this case, the torque characteristics of the motor can be made constant regardless of the position of the rotor.

According to a seventh aspect, in the first aspect, the motor comprises a rotor fixed to the pulsator shaft, and a stator disposed around the rotor, and the motor is provided on the rotor. Detection means for detecting the number of rotations of the rotor in response to the magnetic force of the magnet is provided so that the distance from the magnet does not change due to movement of the rotor.

In this case, the rotation speed of the rotor can be detected stably.

[0030]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side sectional view showing a schematic configuration of a fully automatic washing machine according to one embodiment of the present invention,
2 is a side sectional view of the drive mechanism of the washing machine in FIG. 1, FIG. 3 is a sectional view of a tub shaft, FIG. 4 is a side view of a pulsator shaft, and FIG. FIG. 6 is a plan view of the brake mechanism. In the present embodiment, portions corresponding to the related art are denoted by the same reference numerals, and redundant description is omitted.

In this embodiment, as shown in FIG. 3, a thread groove 15c is formed in the middle part of the inner peripheral part of the tank shaft 15 over the entire circumference, and as shown in FIG. In the place corresponding to the screw groove 15c of the tank shaft 15,
A screw thread 18a screwed into the screw groove 15c is engraved over the entire circumference. When the pulsator shaft 18 is rotated with respect to the tank shaft 15 in a state where the screw groove 15c and the screw thread 18a are screwed, the pulsator shaft 18 is rotated. It moves in the axial direction with respect to the tank shaft 15.

As shown in FIG. 5, a thread groove 15c and a thread 18a are sandwiched in the tank shaft 15.
Two bearings 42 and 43 for rotatably supporting the pulsator shaft 18 around its axis are attached, so that an excessive load is not applied to the screw groove 15c and the screw thread 18a. Rotate smoothly against. Further, the space between the bearings 42 and 43 is filled with grease to reduce friction between the screw groove 15c and the screw thread 18a. The grease is prevented from flowing out of the thread groove 15c and the thread 18a by the bearings 42 and 43, whereby the thread groove 15c and the thread 18a
Can be obtained for a long period of time.

In the present embodiment, the bearings 42 and 43 and the screw groove 15 are used in order to more reliably prevent the grease from flowing out.
annular sealing members 44, 45 between c and thread 18a.
Is provided. Since the grease falls during rotation of the pulsator shaft 18, only the lower seal member 45 may be used. Further, in the present embodiment, the large-diameter portion 18b is formed in a portion of the pulsator shaft 18 above the bearing 42 to prevent the pulsator shaft 18 from falling too much during the washing process. That is, when the pulsator shaft 18 descends and the large-diameter portion 18b contacts the bearing 42, the motor 24
Is overloaded and the rotation speed of the rotor 25 decreases, the sensor 36 detects this, and the control circuit 9 recognizes that the pulsator shaft 18 has reached the lower end position, and stops the motor 34.

In this embodiment, as shown in FIG. 2, an annular regulating member 34 having a diameter larger than that of the pulsator shaft 18 is fixed to the lower end of the pulsator shaft 18. The positional relationship between the regulating member 34 and the tank shaft 15 depends on the pulsator 8
Is in the position shown by the solid line in FIG.
When the pulsator shaft 18 rotates and the pulsator 8 reaches the position shown by the broken line in FIG.
Of the pulsator shaft 18 is prevented from moving upward with respect to the tub shaft 15 by contacting the upper end surface 34a of the pulsator shaft 18 with the lower end surface 15d of the tub shaft 15. The lower support member 13
Is mounted with a sensor 35 for detecting the width of a gap formed between the tank shaft 15 and the regulating member 34.

The lower support member 13 has a rotor 25
A sensor 36 (detection means) for detecting the number of rotations is mounted. The sensor 36 is configured to detect the number of rotations of the rotor 25 in response to the magnetic force of a magnet provided in the rotor 25, so that the movement of the rotor 25 does not change the horizontal distance from the magnet. , Is attached to the lower support member 13.

The upper support member 12 and the lower support member 1
3, a brake wheel 37 is fixed to an outer peripheral portion of the tank shaft 15, and as shown in FIG. Brake band 38 to which 38a is fixed
Is slidably wound, one end of which is bent outward to form a projection 38b. As shown in FIG. 2, an L-shaped brake lever 39 is pivotally mounted on the support member 11 via a screw 14a so as to be rotatable in the horizontal direction, and as shown in FIG. Are bent outward to form a locking portion 39a.

The brake lever 39 is urged in the counterclockwise direction in FIG. 6 by a spring 40, so that the locking portion 39a engages with the projection 38 of the brake band 38.
b. The brake lever 39 is connected to a motor (not shown). When this motor is driven, the brake lever 39 rotates clockwise against the urging force of the spring 40, and the locking portion 39a moves from the projection 38b. It is designed to leave.

Further, in this embodiment, as shown in FIG. 2, the portion 5a around the pulsator 8 on the inner bottom of the washing and dewatering tub 5 is located at the upper end position (position indicated by a broken line) of the pulsator. 8 is formed so as to be located higher than the lower edge 8a of the peripheral edge of the pulsator 8, so that even if the pulsator 8 moves up and down during the washing process, the laundry can be connected to the lower edge 8a of the peripheral edge of the pulsator 8 and the washing and dewatering tub. 5 is not sandwiched between the inner surface of the bottom of the pulsator 5 and the portion 5a around the pulsator 8. The same effect can be obtained even if 5a is formed to have the same height as 8a.

Further, in the present embodiment, the length (thickness) of the rotor 25 along the axial direction of the pulsator shaft 18 is
Regardless of the position of the rotor 25, the rotor 25 and the stator 2
6 is longer than the length (thickness) of the stator 26 along the axial direction of the pulsator shaft 18 by the moving stroke of the rotor 25, so that the motor 24 has a substantially constant torque. Properties can be obtained. The thickness of the rotor 25 and the stator 2
6 may be larger than the moving stroke of the rotor 25. Even if the thickness of the stator 26 is made larger than the thickness of the rotor 25 by the moving stroke of the rotor 25, the same effect can be obtained.

Next, the operation of this embodiment will be described. In the washing process, the motor for driving the brake lever 39 is not energized, and the brake lever 39 is
As a result, the state is urged in the counterclockwise direction in FIG. However, before the start of the washing process, the locking portion 39a of the brake lever 39 is not necessarily
The outer peripheral portion of the brake band 38 and the outer peripheral portion of the brake wheel 37 may be in contact with a portion where the brake band 38 is not wound.

Therefore, it is necessary to fix the washing and dewatering tub 5 during the washing process.
The motor 24 is driven in a direction to move upward with respect to 5. When the pulsator shaft 18 moves upward and the upper end surface 34a of the regulating member 34 contacts the lower end surface 15d of the tank shaft 15,
The upward movement of the pulsator shaft 18 is prevented, the pulsator shaft 18 and the tank shaft 15 are connected and fixed, and the rotational force applied to the pulsator shaft 18 by the motor 24 is transmitted to the tank shaft 15, so that the brake wheel 37 is FIG.
, The protrusion 38 b of the brake band 38 engages with the locking portion 39 a of the brake lever 39. When the regulating member 34 contacts the tank shaft 15,
Since the restricting member 34 contacts while rotating, the collision noise is small.

When the projection 38b of the brake band 38 engages with the locking portion 39a of the brake lever 39,
The rotation of the tank shaft 15 and the pulsator shaft 18 is prevented, and an excessive load is applied to the motor 24, and the number of rotations of the rotor 25 decreases. The sensor 36 detects this, and the control circuit 9 stops the motor 24. Next, the process shifts to a step in which the laundry in the washing / dewatering tub 5 is stirred by the pulsator 8. That is, the motor 24 is driven in the reverse direction, the pulsator shaft 18 moves downward with respect to the tank shaft 15, and the motor 24 is moved in both directions while the upper end surface 34 a of the regulating member 34 is separated from the lower end surface 15 d of the tank shaft 15. Start rotating alternately.

At this time, in the case of a normal washing machine, the pulsator shaft 18 rotates in the direction in which the pulsator shaft 18 moves downward with respect to the tub shaft 15 for the first time, while the pulsator shaft 18 rotates in the same direction in each direction. Perform only one rotation more. Thereby, when the pulsator shaft 18 rotates in the direction of moving upward with respect to the tank shaft 15, it is possible to reliably prevent the upper end surface 34 a of the regulating member 34 from contacting the lower end surface 15 d of the tank shaft 15. . When the motor 24 alternately rotates in both directions, the pulsator 8 alternately rotates in both directions, and the laundry in the washing and dewatering tub 5 is stirred. At this time, the sensor 3
5, the lower end 15d of the tank shaft 15 and the upper surface 3 of the regulating member 34
4a is detected, and the control circuit 9
Detects the reversal drive timing of the motor 24 based on this.

When the pulsator 8 rotates in both directions by a predetermined number of times, the motor 24 is stopped, and the process shifts to the dewatering process.
First, the motor connected to the brake lever 39 is driven, the brake lever 39 rotates against the urging force of the spring 40, the locking portion 39a of the brake lever 39 separates from the projection 38a of the brake band 38, and The dewatering tub 5 is rotatable. Also, the brake lever 39
, The drain valve 41 (see FIGS. 1 and 2) is opened.

Then, the motor 24 is driven in a direction in which the pulsator shaft 18 moves upward with respect to the tank shaft 15, and when the upper end surface 34 a of the regulating member 34 contacts the lower end surface 15 d of the tank shaft 15, the pulsator shaft 18 Is prevented from moving upward, the pulsator shaft 18 and the tub shaft 15 are connected and fixed, and the rotating force applied to the pulsator shaft 18 by the motor 24 is transmitted to the tub shaft 15.
Rotates to perform dehydration.

When the dehydration process is completed, the motor 24 is braked by an electromagnetic brake (not shown), a decrease in the number of revolutions of the rotor 25 is detected by the sensor 36, and the motor connected to the brake lever 39 is driven, and the brake lever 39 is driven. 3
9 rotates, the locking portion 39a engages with the projection 38a of the brake band 38, and the washing and dewatering tub 5 stops.

In order to ensure the connection between the pulsator shaft 18 and the tank shaft 15, the lower end surface 15d of the tank shaft 15 and / or the upper surface 34a of the regulating member 34 may be subjected to friction such as cork or leather. A non-slip member made of a material having a high coefficient may be provided. In addition, various modifications can be made to the above-described embodiment without departing from the gist of the present invention.

[0048]

According to the first aspect of the present invention, the mechanism for releasably connecting the tank shaft and the pulsator shaft includes a screw portion provided on the inner peripheral portion of the tank shaft and the outer peripheral portion of the pulsator shaft, and the pulsator shaft. And a regulating member that is provided at the lower end of the pulsator shaft and comes into contact with and separates from the lower end of the tub shaft with rotation of the pulsator shaft with respect to the tub shaft. Since the connection between the tank shaft and the pulsator shaft or the release thereof can be performed only by itself, no complicated control is required and the reliability is high. Further, since the regulating member is in contact with the tank shaft or the like while rotating, the collision noise is small.

According to the second aspect of the present invention, the load applied to the screw portion is reduced by providing a pair of bearings which are attached to the tank shaft so as to sandwich the screw portion and rotatably support the pulsator shaft. Therefore, the pulsator shaft can be smoothly rotated with respect to the tank shaft.

Further, according to the third aspect, the outflow of lubricating grease can be prevented by the pair of bearings.
The pulsator shaft can be smoothly rotated over a long period of time.

According to the fourth invention, the portion around the pulsator on the inner surface of the bottom of the washing and dewatering tub is positioned at the same height or above the lower end of the peripheral edge of the pulsator when the pulsator is at the upper end position. With such a configuration, it is possible to prevent the laundry from being caught between the lower edge of the peripheral portion of the pulsator and the portion around the pulsator on the bottom inner surface of the washing and dewatering tub due to the vertical movement of the pulsator during the washing process. be able to.

According to the fifth aspect of the present invention, the length of the rotor in the axial direction of the pulsator shaft is adjusted so that the facing area between the rotor and the stator is constant regardless of the position of the rotor. , The torque characteristic of the motor can be made constant irrespective of the position of the rotor.

According to the sixth aspect of the present invention, the length of the stator along the axial direction of the pulsator shaft is adjusted so that the opposed area between the rotor and the stator is constant regardless of the position of the rotor. , The torque characteristics of the motor can be made constant regardless of the position of the rotor.

According to the seventh aspect, the detecting means for detecting the number of rotations of the rotor in response to the magnetic force of the magnet provided on the rotor is provided so that the distance from the magnet does not change due to the movement of the rotor. As a result, the rotation speed of the rotor can be detected stably.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a schematic configuration of a fully automatic washing machine according to an embodiment of the present invention.

FIG. 2 is a side sectional view of a driving mechanism of the washing machine of FIG. 1;

FIG. 3 is a sectional view of a tank shaft.

FIG. 4 is a side view of a pulsator shaft.

FIG. 5 is a sectional view showing a state in which a pulsator shaft is provided inside a tank shaft.

FIG. 6 is a plan view of a brake mechanism.

FIG. 7 is a side sectional view of a conventional fully automatic washing machine.

FIG. 8 is a side sectional view of a driving mechanism of the washing machine of FIG. 7;

[Explanation of symbols]

 Reference Signs List 5 washing and dewatering tank 8 pulsator 15 tub shaft 15c screw groove (screw part) 18a screw thread (screw part) 18 pulsator shaft 24 motor 34 regulating member

Claims (7)

[Claims] 1. A washing and dewatering tub, a hollow tub shaft whose upper end is fixed to the bottom of the washing and dewatering tub, and a tub mounted coaxially with the tub shaft so as to be rotatable around an axis, and both ends of the tub. A pulsator shaft protruding from a shaft and having an upper end protruding into the washing and dewatering tub, a pulsator disposed in the washing and dewatering tub and fixed to an upper end of the pulsator shaft, and a motor for rotating the pulsator shaft; A washing machine comprising: a mechanism for detachably connecting the tub shaft and the pulsator shaft and transmitting a rotational force therebetween; wherein the mechanism comprises an inner peripheral portion of the tub shaft and an outer periphery of the pulsator shaft. A screw portion formed so that when the pulsator shaft is rotated with respect to the tank shaft, the pulsator shaft is formed to move in the axial direction with respect to the tank shaft; and a screw portion provided at a lower end of the pulsator shaft. Pulsay A restricting member that comes into contact with and separates from the lower end of the tank shaft with the rotation of the shaft with respect to the tank shaft, and that prevents the pulsator shaft from moving upward with respect to the tank shaft in a state in which it contacts the lower end of the tank shaft. And a washing machine comprising: 2. The washing machine according to claim 1, further comprising a pair of bearings attached to the tub shaft so as to sandwich the screw portion and rotatably supporting the pulsator shaft. 3. The washing machine according to claim 2, wherein grease for lubrication is filled between the pair of bearings. 4. A portion of the inner periphery of the bottom of the washing and dewatering tub around the pulsator is positioned at the same height as the lower end of the peripheral portion of the pulsator when the pulsator is at the upper end position or above the lower end of the peripheral portion. The washing machine according to claim 1, wherein the washing machine is formed. 5. The motor comprises: a rotor fixed to the pulsator shaft; and a stator disposed around the rotor, wherein the facing area between the rotor and the stator is constant regardless of the position of the rotor. The length of the rotor along the axial direction of the pulsator shaft is longer than the length of the stator along the axial direction of the pulsator shaft by an amount corresponding to the moving stroke of the rotor. Washing machine. 6. The motor comprises a rotor fixed to the pulsator shaft and a stator disposed around the rotor, wherein the facing area between the rotor and the stator is constant regardless of the position of the rotor. The length of the stator along the axial direction of the pulsator shaft is longer than the length of the rotor along the axial direction of the pulsator shaft by an amount corresponding to the moving stroke of the rotor. Washing machine. 7. The motor according to claim 1, wherein the motor comprises a rotor fixed to the pulsator shaft, and a stator disposed around the rotor. The motor rotates in response to a magnetic force of a magnet provided on the rotor. Detection means for detecting
The washing machine according to claim 1, wherein a distance from the magnet is not changed by the movement of the rotor.