JPH0319352Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a dehydrating washing machine such as a fully automatic washing machine, and particularly relates to a braking device using an annular brake band.

(Prior art and its problems) Conventionally, this type of braking device has an annular brake band fitted around the outer periphery of a brake drum, one end of which is bent outward to form a bent piece, and this brake band is bent outward to form a bent piece. By engaging the actuating lever with the bent piece to prevent rotation of the brake band, the dewatering shaft is braked by the frictional force between the brake band and the brake drum. During dewatering, the operating lever engages the bent piece of the brake band that rotates at high speed together with the dehydrating shaft and brake drum, so a loud noise is generated due to the collision between the bent piece of the brake band and the operating lever. The sound is then transmitted to the outer frame of the washing machine, etc.
This is often accompanied by reverberant and resonant sounds, and is a cause of noise in this type of dehydrating washing machine.

(Purpose of the invention) The present invention was made in view of the above points, and the brake band is not directly engaged with the annular brake band and the actuating lever by interposing a rotating drum, a coil spring, etc. between the two. This prevents noise from being generated due to rotation blocking.

(Example) An example of the present invention shown in the drawings will be described in detail below.

1 is an outer frame, 2 is a water tank elastically suspended and supported by a vibration-proof support mechanism within the outer frame 1, 3 is a washing/drying tank,
4 is a hollow dewatering shaft that fixes the tank 3 at the upper end; 5 is a rotary blade disposed at the inner bottom of the dewatering tank 3; 6 is rotatably inserted and supported within the dewatering shaft 4;
A rotating shaft with a pulley 7 fixed to the lower end thereof, 8 a washing/drying motor that transmits rotation to the rotating shaft 6 by stretching a belt 10 between the pulley 7 and a motor pulley 9;
11 is a drain valve, 12 is a substrate provided on the outer bottom of the water tank 1, and 13 is a mechanism case.

14 is a brake drum provided on the dehydration shaft 4, 15
is an annular brake band fitted onto the brake drum 14, a brake lining is attached to the inner surface thereof, and one end is bent outward to form a bent piece 16. 17 is the upper boss portion 1 of the brake drum 14
A rotary drum is fitted onto the outer periphery of the dewatering shaft 4a via a bearing 18 and is rotatable relative to the dewatering shaft 4, that is, the boss portion 14a. is inserted into and engaged with the bent piece 16 of the brake band 15 as shown in the second figure. Thus, the rotating drum 17 is provided integrally with the brake band 15 in the rotational direction by engagement between the arm 19 and the bending piece 16. 21
is wrapped around the outer periphery of the rotating drum 17, and one end is attached to the substrate 12 with a fastener 22 such as a bolt or nut.
It is a coil spring which is fixedly fixed to the coil spring to have a fixed end and the other end is a free end, and its tightening direction is made to coincide with the direction of rotation of the dewatering shaft 4 during dewatering. Reference numeral 23 denotes an operating lever that engages and disengages the free end of the coil spring 21, and is constantly urged in the engagement direction by a spring (not shown), and acts to relax the coil spring 21 by the engagement. 24 is a coil spring which is wound around the outer periphery of the lower boss portion 14b of the brake drum 14, and has one end fixed to the mechanism case 13 with a fastener 25 such as a bolt or nut to serve as a fixed end, and the other end as a free end; The winding direction is set opposite to that of the other coil spring 21.

26 is a clutch boss provided integrally with the rotating shaft 6 or the pulley 7; 27 is a clutch spring which is wound around both the clutch post 26 and the dewatering shaft 4 so that the direction of tightening coincides with the direction of rotation during dewatering;
is located on the outer periphery of the clutch spring 27 and
A rotatable clutch gear that engages and disengages from the lower end of 7, 2
9 is a clutch lever that engages and disengages the clutch gear 28. The operating lever 23 and the clutch lever 29 are in an integral interlocking relationship as is well known in the art, and are operated using a solenoid, a small motor, etc. as a drive source, as in the past.

The operation of the above configuration will be explained.

During dewatering, the actuating lever 23 engages the free end of the coil spring 21 to put the spring 21 in a relaxed state, and the clutch lever 29 is disengaged from the clutch gear 28. When the motor 8 is driven in this state, the rotation of the pulley 7 is transmitted to the dewatering shaft 4 via the clutch spring 27, whereby the washing and dehydrating tub 3 is rotated to dewater the laundry. At this time, since the coil spring 21 is in a relaxed state, the rotary drum 17 rotates together with the brake band 15 along with the dewatering shaft 4.

When the dewatering time has elapsed, the motor 8 stops, and the operating lever 23 and clutch lever 29 are operated, the dewatering operation is completed. At this time, the clutch lever 29 engages with the clutch gear 28 to release the power transmission state by the clutch spring 27, while the operating lever 23 releases the engagement with the free end of the coil spring 21. Then, since the tightening direction of the coil spring 21 and the rotation direction of the rotary drum 17 match, the rotation of the rotary drum 17 is prevented by the tightening of the coil spring 21, and accordingly, the rotation of the brake band 15 is also prevented. This means that
Frictional force is generated between the brake band 15 and the brake drum 14 rotating inertia, and this frictional force applies a brake to the dewatering shaft 4 to quickly stop its inertial rotation.

As described above, the brakes are applied at the end of the dewatering operation, but at this time, there is no collision between the operating lever and the bent piece of the brake band as in the past, and the noise caused by the collision is eliminated. The occurrence can be eliminated.

During washing, the rotating shaft 6 and the rotary blades 5 are periodically reversed by the left-right reversing drive of the motor 8, and the washing is performed by reversed water flow. At this time, the washing/dehydration tub 3 can be rotated in either direction. There's nothing to do. That is, when the washing and dewatering tank 3 attempts to rotate in the same direction as during dewatering, the rotating drum 17 and the brake band 15 are in a stopped state due to the tightening of the coil spring 21, and the rotation between the band 15 and the brake drum 14 is caused. It is prevented by the frictional force, and if it tries to rotate in the opposite direction, it is prevented by the tightening of the coil spring 24.

(Effects of the invention) As described above, according to the configuration of the present invention, it is possible to prevent the generation of noise caused by blocking the rotation of the brake band in a machine that uses an annular brake band, and to reduce the noise of the entire dehydrating washing machine. be able to.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part of the braking device of the present invention, FIG. 2 is a view taken along the arrow A in FIG. 1, and FIG. 3 is a schematic vertical sectional view of a dehydrating washing machine implementing the same device. 3...Washing and dehydration tank, 4...Dehydration shaft, 14...
Brake drum, 15... Brake band, 17
... Rotating drum, 21 ... Coil spring, 23 ...
Actuation lever.

Claims (1)

[Scope of claim for utility model registration] A brake drum is installed on the dewatering shaft that fixes the tank,
An annular brake band is fitted to the brake drum, and the rotation of the brake band is prevented and the dehydration shaft is braked by friction between the band and the brake drum, which is rotatable with respect to the dehydration shaft. a rotating drum that is large and is provided integrally with the brake band; a rotating drum that is wrapped around the outer circumference of the rotating drum and has one end fixed to
It is equipped with a coil spring whose other end is a free end and whose tightening direction is the same as the direction of rotation during dewatering, and an operating lever that engages and disengages the free end of the coil spring, and the operating lever engages with and disengages from the free end of the coil spring during braking. What is claimed is: 1. A braking device for a dehydrating washing machine, which is configured to release the engagement of the coil spring and engage the free end of the coil spring when not braking to put the coil spring in a relaxed state.