JPH0246866Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a rotation braking device for 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 provided 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.

The rotation transmitting section 8 consists of an inner drive shaft 15 to which the pulley 7 is attached, a spring crack mechanism 14 for connecting and disconnecting 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 single-tank washing machine, the gear case of the planetary gear device 9 is used as the brake wheel 13, the brake band 10 is fitted around the outer circumference of the gear case, and one end of the brake band 10 is attached to the outside. It is bent to form a claw 10a. Then, a brake lever 12 was installed horizontally through a hole in the brake wheel case 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 latch 19 at the tip of the clutch lever 18 also engages with the spring clutch mechanism 14 to loosen the internal clutch spring and reduce frictional resistance, so that the forward and reverse rotation of the pulley 7 is transmitted only to the inner rotary drive shaft 15. Then, 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, and controlling the rotation of the pulley 7 to the outer rotary drive shaft 1.
6, and the agitator 1 and dehydration tank 2 rotate at high speed only in one direction as one unit.

[Problem that the invention attempts 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 in that the dehydration tank stopped rotating while making a loud crashing sound.

Therefore, it is possible to apply braking without making noise by pressing the brake arm against the brake wheel through the cushion material, but in this case, the brake wheel also swings forward and backward when washing starts after dehydration. The brakes cannot maintain sufficient braking because the brakes try to enter the brake position. Therefore, it is necessary to provide a means for locking the brake wheel, such as a lock lever, in addition to the brake arm to obtain reliable braking. Since the main braking is done by the brake arm, there is no risk of making a loud noise when the lock lever engages and disengages, but if this operation is performed by a drive mechanism separate from the brake arm, it will require springs and other complex braking mechanisms, and it will take up a lot of space. It takes a lot of time, and the cost is also high.

The purpose of the present invention is to eliminate the disadvantages of the conventional example,
In addition to the brake arm that presses through the cushion material, a lock lever is provided to obtain complete braking for the brake wheel.A simple mechanism is required to link the operation of this lock lever with the brake arm, and the lock lever is biased. To provide a braking device for a washing machine that does not require an external spring and does not take up space for installing parts.

[Means for solving problems]

In order to achieve the above object, the present invention connects a rotary shaft to a brake arm that can be pressed to the brake wheel via a cushion material with high frictional resistance, and a lock lever that can be engaged with the brake wheel is attached to the rotary shaft. The gist of this lock lever is to form a rectangular elongated hole in which the coil spring is housed, and to engage the protrusion from the rotating shaft side with the end of the spring within the elongated hole.

[Effect]

According to the present invention, when the brake arm is separated from the brake wheel during dewatering, the shaft moves with it, the protrusion of the shaft hits the end of the elongated hole, the lock lever also rotates, the lock lever also separates from the brake wheel, and the brake is released. It is released and the dehydration tank rotates freely at high speed. When the brake is operated at the end of dehydration, the brake arm is pressed by the brake wheel, applying the brake and stopping the rotation of the dehydration tank.
At this time, since only the cushion material comes into contact with the brake wheel, the rotation of the brake wheel can be stopped without making a loud noise.

In this way, when the brake is activated and the brake arm moves, the rotating shaft also rotates by that amount, and the protrusion moves within the elongated hole of the lock lever, compressing the coil spring. The compressed coil spring biases the lock lever toward the brake wheel.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Fig. 1 is a plan view of essential parts showing one embodiment of the braking device for a washing machine according to the present invention, in which 9 is a planetary gear system, 13 is a brake wheel that utilizes the gear case, and 15 is an inner side that swings an agitator. Reference numeral 16 indicates an outer rotational drive shaft for rotating 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 the center of the arm 21 is opposed to each other. A curved surface 21a is formed, and a cork material 22, for example, is pasted thereon as a cushion 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 provided upright near the cam 24, and is attached thereto to press the arm 21 toward the wheel 13. One end of the torsion spring 26 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, a protrusion 27b from the rotating shaft 27 side was inserted into a rectangular elongated hole 28b formed in the lock lever 28. A coil spring 29 is disposed within this elongated hole 28b to bias the protrusion 27b in the direction of expansion.

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, usage and operation will be explained. During the dewatering process, as shown in FIG.
1 is separated from the brake wheel 13, and the cork material 22 is separated 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 the brake is operated after the completion of dewatering 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, the arm 21 is moved against the brake wheel 13 by the force of the torsion spring 26 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 dehydration 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.

At this time, the end of the protruding arm 31a of the sliding spring 31 also moves within the horizontal hole of the L-shaped through hole 28c of the lock lever 28 to the connecting portion with the vertical hole. When the brake wheel 13 rotates counterclockwise as shown in the figure at the start of dewatering, the sliding spring 31 also moves in the same direction and the end of the protruding arm 31a moves to the innermost part of the vertical hole of the through hole 28c, as shown in FIG. Return to state.

[Effect of idea]

As mentioned above, the braking device for the washing machine of the present invention presses the brake arm against the brake wheel through the cushion material, so it does not generate loud noises during braking and provides quiet operation. be.

In addition, in order to engage the lock lever with the brake wheel and obtain more reliable operation, the lock lever and the brake arm can be mechanically interlocked using a simple member, and the spring for biasing the lock lever is provided externally. The entire mechanism can be stored compactly without taking up much space.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the state of the braking device 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 same is being 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 unit, 9... Planetary gear device, 10... Brake band, 10a... Pawl, 11... Brake wheel case, 12... Brake lever, 13... Brake Wheel, 14... Spring clutch mechanism, 15,
16...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 protrusion,
27b...Protrusion, 28...Lock lever, 28a
...Claw, 28b ... Long hole, 28c ... L-shaped through hole, 29 ... Coil spring, 30 ... Synthetic resin ring, 30a ... Recess, 31 ... Slip spring.

Claims (1)

[Scope of utility model registration request] A rotary shaft is connected to a brake arm that can be pressed to the brake wheel via a cushion material with high frictional resistance, a lock lever that can be engaged with the brake wheel is attached to the rotary shaft, and a rectangular elongated hole is attached to the lock lever. A braking device for a washing machine, characterized in that a coil spring is housed therein, and a protrusion from the rotating shaft side is engaged with the end of the spring within an elongated hole.