JPH0318920B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for braking the rotation of a washing and dewatering tank in a fully automatic (single tank type) washing machine.

[Conventional technology]

Such single-tank washing machines use a single motor to perform both washing and dewatering operations. For example, in the case of an agitation type washing machine, the agitator is slowly swung during the washing operation, and the dewatering tank is moved at high speed during the dewatering operation. Since the motor is rotated, a deceleration transmission mechanism is connected to the motor, and a planetary gear is usually used for this deceleration transmission mechanism.

First, referring to FIG. 4, we will explain the overall structure of the washing machine. In the figure, 1 is an agitator placed in the center of the dehydration tank 2, 3 is a water receiving tank installed outside the dehydration tank 2, and 4 is a motor. This is pulley 5, V
It is further connected to a deceleration rotation transmission section 8 via a deceleration transmission mechanism of a belt 6 and a pulley 7.

This rotation transmission section 8 consists of an inner drive shaft 15 to which the pulley 7 is attached, a spring lock mechanism 14 for engaging and disengaging these, and the like.
5 is connected to an agitator 1, and an outer drive shaft 16
A dehydration tank 2 is connected to the .

A planetary gear device 9 is used as a second reduction mechanism in the middle of the drive shaft 15, and a gear case of the planetary gear device 9 is interposed in the drive shaft 16.

As a braking device for the dehydration tank 2 of this type of one-tank washing machine, the gear case of the planetary gear device 9 is used as the brake wheel 13, the brake hand 10 is fitted on the outer periphery of the gear case, and one end of the brake hand 10 is fitted. Bend it outward to form the claw 10a. Then, a brake lever 12 was installed horizontally through a hole in the brake wheel 11 so that its tip abutted against the pawl 10a, and the brake lever 12 was supported by a lever shaft 17.

Further, the lever shaft 17 of the brake lever 12
Clutch lever 1 is located closer to the base than the part that touches the
8 is fixed, and its tip extends obliquely downward, and a ratchet 19 is provided at the tip. This ratchet 19 meshes with a plurality of teeth provided on a clutch cover surrounding the outer periphery of the spring clutch mechanism 14 of the drive shaft 16.

In this configuration, when washing, the brake lever 12 is pulled by a solenoid valve (not shown) and approaches the brake band 10, and its tip touches and locks the pawl 10a of the brake band 10, thereby locking the brake wheel. 13 is prevented from rotating, and the dehydration tank 2 does not rotate. At the same time, the ratchet 19 at the tip of the clutch lever 18 also engages with the spring clutch mechanism 14 to loosen the clutch spring inside and reduce frictional resistance, so that the pulley 7
The forward and reverse rotations are transmitted only to the inner rotary drive shaft 15, and only the agitator 1 swings at a low speed.

On the other hand, during dehydration, the brake lever 12 is moved away from the brake band 10 by a solenoid valve (not shown) to release the claw 10a of the brake band 10, thereby allowing the brake wheel 13 to rotate. At the same time, the latch 19 at the tip of the clutch lever 18 is also moved away from the spring clutch mechanism 14, tightening the clutch spring to increase frictional resistance, transmitting the rotation of the pulley 7 to the outer rotary drive shaft 16, and connecting the agitator 1 and It is integrated with the dehydration tank 2 and rotates at high speed in only one direction.

[Problem that the invention seeks to solve]

In such conventional braking devices, the rotation of the dehydration shaft is forcibly braked using the brake lever at the end of dehydration, so the brake lever receives a stronger impact force than the brake wheel, which causes damage to the brake lever and lever shaft. There was an inconvenience that the dehydration tank would stop rotating while making a loud crashing sound.

In order to eliminate this inconvenience, it is conceivable to insert a cushion material between the brake wheel and the brake arm to absorb the impact sound during braking, but this method does not work in one direction, for example, like with a conventional pulsator. Relatively effective braking force can be obtained for shafts that only rotate, and for machines such as agitator-type washing machines where the agitator rotates forward and backward, the rotating shaft of the dehydration tank also rotates forward and backward. However, it is not possible to obtain sufficient braking force, especially in the reverse direction. As a result, it is incomplete to completely stop the dehydration tank and swing only the agitator.

The purpose of the present invention is to eliminate the disadvantages of the conventional example,
At the end of dewatering, the lever shaft receives no impact from the brake lever, and no collision noise is generated.Furthermore, even if the agitator shaft and dehydration tank shaft try to rotate forward or backward when moving from the dehydration process to the washing process, the brake wheel will not be affected by the impact caused by the brake lever. The object of the present invention is to provide a method for braking a washing machine that can obtain sufficient braking force and completely stop a dehydration tank.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention provides a braking device that combines a brake wheel of a single-tank washing machine and a brake arm that presses against the brake wheel through a cushion material having a large frictional resistance. A sliding spring is provided that engages with the lock lever, and when the brake arm is disengaged at the start of spin-drying, the slide spring is engaged with the lock lever and the lock lever is disengaged from the recessed portion, and the slide spring remains engaged with the lock lever during rotation of spin-drying and braking of spin-drying. The main idea is to maintain the disengaged state of the lock lever, release the engagement of the sliding spring with the lock lever at the start of cleaning operation, and engage the lock lever in the recess.

[Effect]

According to the present invention, during dehydration, the brake arm and lock lever are separated from the brake wheel by the cam, the brake is released, and the dehydration tank freely rotates at high speed. When the brake is operated at the end of dehydration, the cam rotates and the brake arm is pressed against the brake wheel by spring force, applying the brake and stopping the rotation of the dehydration tank. At that time, only the cushion material comes into contact with the brake wheel, so the rotation of the brake wheel can be stopped without making a loud noise.During this time, the lock lever is engaged with a sliding spring, so the lock lever is able to brake. It remains detached from the wheel. Thereafter, when the washing process begins and the shaft begins to swing, the sliding spring disengages from the lock lever, and the lock lever lowers and engages with the outer circumferential recess of the brake wheel. As a result, braking is applied to the brake wheel, and only the agitator swings while the dewatering tank remains stopped. Also, when the lock lever lowers, it is done on the swinging brake wheel and in its early stages, so unlike when stopping something that is rotating at high speed, it does not cause a large impact.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a plan view of essential parts showing one embodiment of a device used in the washing machine braking method of the present invention. In the figure, 9 is a planetary gear device, 13 is a brake wheel using the gear case, and 15 is an agitator for shaking an agitator. The inner rotary drive shaft 16 indicates the outer rotary drive shaft that rotates the dehydration tank, and the overall structure in which the planetary gear device 9 is incorporated is almost the same as that shown in FIG. 4, so a description thereof will be omitted.

Connect one end of the brake wheel 13 to the pin 2.
A substantially L-shaped brake arm 21 that is pivotally supported at 0 is opposed to each other, and the short side of the arm 21 on the bent side is curved along the wheel 13, and the long side has the same curvature as the circumferential surface of the wheel 13 in the middle of the long side. A curved surface 21a is formed, and a cork material 22, for example, is pasted thereon as a cushioning material having high frictional resistance. On the other hand, one longitudinal end of this brake arm 21) is engaged with a cam 24 rotated by a torque motor 23, and a pin 25 is set up near the cam 24 so as to press the arm 21 toward the wheel 13. One end of the torsion spring 26 to be biased is locked.

In the figure, reference numeral 27 denotes a rotating shaft having a horizontal projecting piece 27a integrally molded with the pin 25 at its tip, and a lock lever 28 having a claw piece 28a at its tip is rotatably attached to the upper part of the rotating shaft 27. Further, the protrusion 27b was inserted from the rotating shaft 27 side into a rectangular elongated hole 28b formed in the lock lever 28. and,
A coil spring 29 is disposed within this elongated piece 28b and biases the protrusion 27b in the direction of extension.

Note that the torsion spring 26 is wound around the outer periphery of the rotating shaft 27.

Furthermore, the lock lever 28 has an L-shaped through hole 28c positioned such that one horizontal hole faces in the direction in which the lever 28 rotates toward the wheel 13 due to the coil spring 29, and the other vertical hole is positioned perpendicular to that direction. Form.

A synthetic resin ring 30 having a continuous uneven surface is fitted onto the upper outer periphery of the brake wheel 13, recesses 30a are arranged in parallel at predetermined intervals, and a sliding spring 31 is wound around the groove formed in the synthetic resin ring. The end of the protruding portion of the attached sliding spring 31 is engaged with the L-shaped through hole 28c of the lock lever 28.

Next, the method of the present invention performed using the above-mentioned apparatus will be explained. During the dewatering process, as shown in FIG. 1, the most protruding part of the cam 24 from its axis contacts the brake arm 21, and the brake arm 21 moves against the brake wheel 13 against the torsion spring 26.
The cork material 22 is further away from the brake wheel 13.

In this state, the brake wheel 13, that is, the planetary gear system 9 rotates freely, and the rotary drive shaft 1
5 and 16 both rotate in one direction, and the dehydration tank rotates at high speed.

In this case, the rotating shaft 27 connected to the brake arm 21 is also fixed at the illustrated position, and the protrusion 27
When b hits the end of the elongated hole 28b, the lock lever 28
It also remains in the induced state. When a brake operation is performed after the dewatering is completed or by opening the lid on the tank, the cam 24 is rotated by the motor 23 so that the portion closest to the axis comes into contact with the brake arm 21. As a result, as shown in FIG.
When pulled to the side, the cork material 22 is pressed against the outer periphery of the wheel 13, and the rotation of the wheel 13 is stopped by frictional force without making a sound, and the rotation of the dewatering concave tank is stopped.

This completes the dewatering process, but when the brake is activated and the brake arm 21 moves slightly counterclockwise as shown in the figure, the rotating shaft 27 also rotates counterclockwise by this amount via the pin 25, causing the protrusion 27b to become longer. hole 28
b and compresses the coil spring 29. The compressed coil spring 29 tries to move the lock lever 28, but the sliding spring 31 moves the lock lever 28.
It engages with the vertical hole of the through hole 28c of No. 8 to prevent its movement.

Next, the washing process begins, and the motor 4 shown in FIG.
When the agitator 1 attempts to swing in forward and reverse rotations, the brake wheel 13 of the planetary gear device 9 also rotates somewhat in the forward and reverse directions.

As a result, the sliding spring 31 also moves back and forth along with the brake wheel 13, and its tip moves toward the side hole of the L-shaped through hole 28c, and the lock lever 2
8 is released. Then, the lock lever 28 falls down due to the elasticity of the compressed coil spring 29, and the claw 28a at the tip thereof enters the recess 30a of the brake wheel 13, thereby locking the brake wheel 13. This locking is performed on the slowly swinging brake wheel 13, and since both the recess 30a and the locking lever 28 are made of synthetic resin, they do not make a loud noise.

As a result, the spring clutch mechanism 1 in FIG.
4, only the inner rotary drive shaft 15 swings, and the agitator 1 remains stationary while the dewatering tank remains stationary.
only sways.

When the washing process is over and the dewatering process begins, the cam 24 rotates to separate the brake arm 21 from the brake wheel 13, and at the same time, the rotating shaft 27
rotates clockwise, and the lock lever (28) is also raised via the protrusion 27b, returning to the state shown in FIG.

Note that the device shown in the above embodiment is an example,
For example, the cushion material may be disposed on the brake wheel 13 side, or the concave portion 30a of this wheel 13 may be
Various changes can be considered, such as changing the shape of.

〔Effect of the invention〕

As described above, the method of braking a washing machine according to the present invention prevents the brake lever and lever shaft from colliding with each other during braking due to the sound-absorbing effect of the cushion material, and enables quiet operation. This applies braking to the brake wheel at the end of dewatering, but even if the brake wheel attempts to rotate in both forward and reverse directions when the next washing process begins, it can be reliably stopped by engaging the brake wheel with the lock lever. be. Furthermore, during dehydration braking, the lock lever is maintained in its disengaged state so as not to engage with the brake wheel, so that braking does not become unstable.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the braking method of the washing machine of the present invention during dehydration, Fig. 2 is a plan view when the above dehydration is completed, Fig. 3 is a plan view when the above is washed, and Fig. 4 is fully automatic. A partially cutaway front view showing the overall structure of the washing machine, and FIG. 5 is a longitudinal sectional front view showing a conventional example. 1...Agitator, 2...Dehydration tank, 3...Water tank, 4...Motor, 5...Pulley, 6...V belt, 7...Pulley, 8...Deceleration rotation transmission section,
9... Planetary gear device, 10... Brake band,
10a...nail, 11...brake wheel case, 12...brake lever, 13...brake wheel, 14...spring clutch mechanism, 15,1
6...Rotation drive shaft, 17...Lever shaft, 18...
Clutch lever, 19... Ratchet, 20...
Pin, 21...brake arm, 21a...curved surface, 22...cork material, 23...torque motor,
24... Cam, 25... Pin, 26... Torsion spring, 27... Rotating shaft, 27a... Horizontal projecting piece, 27
b... Protrusion, 28... Lock lever, 28a...
Claw, 28b...long hole, 28c...L-shaped through hole,
29...Coil spring, 30...Synthetic resin ring, 30a...Concave portion, 31...Sliding spring.

Claims (1)

[Claims] 1. In a braking device that combines the brake wheel of a single-tank washing machine and a brake arm that presses against the brake wheel through a cushion material with high frictional resistance, a recess is provided on the outer periphery of the brake wheel and a sliding spring that engages with the lock lever is provided to remove water. At the time of disengagement of the brake arm at the start, a sliding spring is engaged with the lock lever to disengage the lock lever from the recessed portion, and during dehydration rotation and dehydration braking, the sliding spring is kept engaged with the lock lever to maintain the disengaged state of the lock lever; A method of braking a washing machine characterized by disengaging a sliding spring from engagement with a lock lever and engaging the lock lever with a recess at the start of washing operation.