JPS5810092A - washing machine drive device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drive device for a washing machine, and particularly to a drive device suitable for operating a drain cock, a clutch, a brake, etc.

Conventionally, this type of device uses a solenoid, and has a structure in which the plunger of the solenoid directly pulls an operating body such as a drain cock, clutch, brake, etc. Therefore,
When the solenoid is energized, the solenoid's plunger is suddenly attracted and collides with the solenoid's core, producing an extremely loud sound. This sound is transmitted to the outer frame of the washing machine, and is often accompanied by reverberant and resonant sounds.This is a long-standing problem that needs to be solved, as it causes great discomfort to the user. there were.

Therefore, in recent years, instead of using a solenoid, a small electric motor has been used to rotate the drain cock, clutch, etc.
A proposal was made to release the brakes, etc.

This device uses the rotational output of a small electric motor to transmit rotational force to the drain cock at the bottom of the outer tank, the brake that applies braking action to the dehydration tank in the outer tank, and the dehydration tank during washing prior to the dewatering process. This releases all three clutches that prevent the

However, if this master is opened, the dewatering process cannot be executed, and a switch is required to rotate the drive motor in order to rotate the dehydrating tank. Moreover, if this switch is used regardless of the operation and configuration of the three above, it goes without saying that it will be difficult to assemble, and especially if the switch is incorporated into a time switch, the configuration will be extremely complicated. This makes the time switch even more complicated, which is undesirable.

1 to 4 show a conventional washing machine equipped with a solenoid for operating a drain cock, etc., and this will be explained below.

A plurality of outer frame receivers 2 are fixed to the upper part of the j-frame 1, and a hanging rod 4 is provided via a slider 3.

This hanging rod 4 is provided with a buffer tube 5 containing a vibration-proof spring (not shown). An outer tank 7, which also serves as a water tank, is suspended and supported. Further, a base plate 8 is fixed to the bottom of the outer tank 7, and a clutch case 9 is fixed to the base plate 8 so as to be watertight to the outer tank 7.

10 is a motor for driving the washing machine, and 11 is a clutch device that pulls a clutch or the like.

Fig. 2 shows details of the clutch device. When the clutch pawl 12 is engaged with the clutch post 13 due to the biasing force of a clutch spring (not shown), the clutch spring idles, and the operation is controlled by a control switch. When the clutch pawl 12 is disengaged from the clutch boss 13, the rotational force of the washing machine driving motor 1o is transmitted to the dehydration shaft, and the dehydration tub 7a, which also serves as a washing tub, performs dehydration rotation. When the solenoid 14 is suctioning, the drain cock 16 at the bottom of the outer tank 7 is activated. The brake 16 is also pulled at the same time.

Next, the operation of the above-mentioned washing machine is explained using the electrical circuit diagram shown in Fig. 3 and the electrical circuit diagram shown in Fig. 4.
This will be explained based on the program chart shown in the figure.

17 is a power supply, and when the contact T1 of the automatic time switch 18 is turned to the a side, the contact T1 is turned on from the NC side of the pressure switch 19.
The water supply valve 2o is energized through the a side of the outer tank 7.
Water gets inside. When the water reaches a certain water level, the pressure switch 19 switches from the NC side to the No side.
Automatic time switch 18 contact T4 6-+ 76 a
-Ts (automatic reversal contact) energizes the capacitor 21 and the drive motor 1°, and the pulsator in the dehydration tank 7a begins to rotate and washing begins. At this time, the timer motor 23
At the same time, the power is turned on and the program begins to migrate.

Next, the water is energized to the solenoid 14 via the contact T1 a of the automatic time switch 18, the No side of the pressure switch 19, the contact T4 a, and the contact T6 b.

When the pressure switch 19 is set to the NC side, the solenoid 1 is connected via the contact T5 and the lid switch 22 and the contact T6 b.
4 is energized and drainage is carried out. In this drainage process, the dehydration tank 7a is rotated intermittently from the middle, which is a so-called intermittent dehydration process. In this intermittent dehydration, contact T1 of automatic time switch 18 - NC side of pressure switch 19 - contact T5 - b - lid switch 22 - contact T - contact T9
a (automatic reversing contact) - a of contact T2 - capacitor 21
The drive motor 1o is energized via the drive motor 1o. At this time, the solenoid 14 is also energized from T6b. Therefore, the dehydration tank 7a rotates for dehydration only when the contact T9 is turned on.

Contacts T and T9 are automatic reversing contacts, but the contacts repeatedly turn off the a side and the b side at regular intervals. Furthermore, when the solenoid 14 is in suction, not only the drain cock 15 but also the clutch and brake 16 are pulled at the same time.

Next, for dehydration, from the connected state of intermittent dehydration, the b side of contact T4 of automatic time switch 18 is turned off, and contact T4 is turned off instead.
When 7b is entered, it will be carried out for a certain period of time.

Next, rinsing is almost the same as washing, but the difference is that when the rinse selector switch 24 is turned on, overflow rinsing can be performed, and when it is not, rinsing can be performed.

As described above, the program proceeds as follows: washing - drain, water, rinse. If the drain/spin stop switch 26 is not turned on at the end of the final rinse,
At the end of rinsing, the program is paused, and if the switch 25 is turned on, the program proceeds to the next drain and dewatering process, and before the dehydration ends, the buzzer 26 sounds and the washing ends.

During the dewatering process, the time A when the contact T2 of the automatic time switch 18 is turned off is the time when the power to the motor 1o is cut off and the dehydration tank 7a is turned off.
Indicates the time period in which the dehydration tank 7a is rotated by inertial force, improves reliability when applying braking next time, and furthermore, prevents flying springs by reliably stopping the dewatering tank 7a when water is poured in the next rinsing process. It is.

According to the configuration of the conventional washing machine described above, - solenoid 1
4, the drain cock 15. Clutch device 11
．． It operates the brake 16, and the solenoid 1
When power is applied to 4, the plunger is suddenly sucked,
It collides with the core of the solenoid 14 and produces an extremely loud sound. This sound was transmitted to the outer frame 1st class, producing unpleasant echoes and resonance sounds.

Therefore, as mentioned above, it has been proposed to use a small electric motor instead of a solenoid, but this also complicates the operation and configuration relationship between the switch for controlling the drive motor and the small electric motor, which is undesirable. It is.

The present invention uses a small electric motor in place of the above-mentioned solenoid, and improves the operation and structural relationship between the small electric motor and the switch that controls the drive motor of the small electric device, which mainly includes a group of reduction gears. In addition to this, by installing a unitized version of these devices on the dehydration tank side while ensuring electrical insulation, a drive device that is highly safe and easy to assemble is provided. .

Embodiments of the present invention will be described below with reference to FIGS. 6 to 8. Note that in this figure, the same reference numerals as in FIGS. 1 to 4 indicate the same members, and therefore the description thereof will be omitted. In the figure,
27 is a switch, and 28 is a small electric device incorporating the switch 27, which is provided in place of the conventional solenoid described above.

Then, the small electric motor 290 rotations of the small electric device 28 are as follows.
The transmission is transmitted to the output shaft 31 from the reduction gear group 3o, the cam 32 fixed to this output shaft 31 rotates, and the contact plate 33 in contact with the cam surface 32a of this cam 32 operates with the contact board 37 as a fulcrum. A contact 36 provided on the contact plate 33 is closed to the contact 35 of 34. Note that the switch 27 is connected to the contact plate 3.
3, 34.

It is composed of contacts 35 and 36 and a contact board 37.

The cam 32 rotates in the direction indicated by the arrow in FIG. 7(A), and the drain cock 15, clutch boss 13. The brake 16 etc. are released.

Now, the transmission cam 38 fixed to the output shaft 31 is rotated, and as the transmission cam 38 rotates, the wire 39 connected at one end to the transmission cam 38 is pulled in the direction of the arrow 1°, and the drain cock 15. The clutch boss 13, brake 16, etc. are opened to perform clutch switching between washing and dewatering. When the switch 27 is closed by the cam surface 32a of the cam 32 of the output shaft 31, the drain cock 16. The clutch boss 13, brake 16, etc. are opened by a transmission cam 38,
Conversely, the drain cock 16. When the clutch box 13, brake 16, etc. are not released, switch 27
is being opened.

Accordingly, according to the circuit configuration shown in FIG. 5, electricity is applied to the small electric device 28 from contact point T6 (b) of the automatic time switch 18, which is turned on during draining/dewatering, and the switch 27 is closed after a certain delay time. Although the switch 27 does not normally need to be configured to close after a delay time due to the presence of waste water before dehydration in the program, it is necessary in the following case.

That is, in the middle of the dewatering process, the washing lid 1a is opened and the lid switch 22 is opened, and then the washing lid 1a is closed again and the lid switch 2 is turned on.
When clutch boss 13.2 is closed, the rotation speed of output shaft 31 of small electric device 28 is slow. Brake 1
6 etc. is not opened, and in this state, drive motor 1
This will place an excessive load on o.

Therefore, the switch 27 is provided by connecting one end to either the main winding or the auxiliary winding of the drive motor 10 and the other end to the a of the contact T2 of the automatic time switch 18 that is turned on during dehydration. .

Clutch boss 13. The drive motor 1o can be energized by releasing the brake 16 and the like.

Therefore, an excessive load is not applied to the drive motor 10.

The small electric device 28 is composed of a small electric motor 29 and a group of reduction gears 30, and the switch 27 is integrated therein. That is, 40 is a case made of electrically insulating synthetic resin in which the small electric device 28 is housed, for example,
glass reinforced polypropylene, glass reinforced polyester,
If it is made of a thermoplastic molding material such as polyacetal or nylon, productivity will be improved and not only electrical insulation performance but also waterproof and moisture-proof effects can be obtained. The case 4o houses a small electric motor 29 inside its bottom 41, and has a reduction gear group 30. Main plate 42. The switches 27 are arranged one on top of the other, and the open end surface is covered with a lid 43. The output shaft 31 projects from the lid 43 to the outside of the case 40 .

Further, the case 40 is directly attached to the bottom of the outer tank 7 or to the substrate 8, and FIG. 8 shows the structure of the case 40.

According to FIG. 8, the case 4o is directly attached to the outer bottom of the outer tank 7. Specifically, the outer tank 7 is attached to the outer bottom of the outer tank 7 made of resin.
A cylindrical boss 7b is integrally formed to protrude downward, while a flange portion 40a is integrally formed at opposing ends of the periphery of the case 40 to protrude laterally. Then, the tapping screw 44 is passed through the flange portion 40a and the cylindrical boss 7 is inserted.
By screwing into b, the case 4o is fixed to the bottom of the outer tank 7.

Note that the case 40 may be attached to the board 8 in the manner described above.

As is clear from the above embodiments, the present invention provides a small electric device including a small electric motor, a reduction gear group that receives the rotational output of the small electric motor, and an output shaft that rotates in response to the rotational output of the reduction gear group. A drain cock at the bottom of the outer tank is opened in response to the rotational output of the output shaft, and a dewatering tank serving as a washing tub in the outer tank is made rotatable for dewatering in response to the rotational output of the output shaft. A clutch for releasing a clutch boss and a brake for releasing the dehydration tank from a braking state in response to the rotational output of the output shaft are provided, and the clutch switches the dehydration rotation of the dehydration tank and the rotation of the pulsator in the dehydration tank. A drive motor is provided, and the drive circuit of the drive motor is provided with a switch that is closed to energize the drive motor during the dewatering process, and the small electric device and the switch are electrically insulated. It is housed in a resin case, and this case is attached to the bottom of the outer tank or a board provided at the bottom of the outer tank, and there is no abnormal noise that occurs when using a conventional solenoid. Of course, since the switch for controlling the drive motor is not built into the time switch, the complicated time switch structure will not be further complicated, and the small electric device including the switch can be housed inside the case. It is a small electric motor because it is housed in a single unit and is waterproof and moisture-proof, making it easy to assemble, and the case has electrical insulation properties.

It is highly safe because it prevents electrical leakage from switches, etc. to the outside of the case, and there are no parts inside the case that move with impact, and the case is designed to protect the bottom of the outer tank without using cushioning materials such as elastic bodies. Alternatively, it can be mounted directly on the board.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional view of a conventional washing machine, Fig. 2 is a partially sectional top view showing the structure for controlling the drain cock, brake and clutch, and Fig. 3 is its electrical circuit diagram. Fig. 4 is a diagram showing the operation program of the time spin, Fig. 5 is an electrical circuit diagram of a washing machine according to an embodiment of the present invention, and Fig. 6 is a diagram showing the control of the drain cock, brake, clutch, etc. of the washing machine between colors. A partial cross-sectional top view showing the structure of the reservoir, Figure 7 shows a small electric device, Figure (A) is a top view showing the state with the lid removed, Figure (B) shows the state with the lid attached. FIG. 8 is a longitudinal sectional view showing the installation structure of a case housing a small electric device. 7...Outer tank, 7a...Dehydration tank, 8...
... Board, 10... Drive motor, 13.
...Clutch post, 16...Drain cock, 16...Brake, 27...Switch, 29...Small electric motor, 3o... ...Reduction gear group, 31...Output shaft, 40...
Case. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure [Figure 2 Figure 2 Spring 3 Figure 4 Figure -5 Figure 6 Figure 7 (β)

Claims (1)

[Scope of Claims] A small electric device is provided that includes a small electric motor, a reduction gear group that receives the rotational output of the small electric motor, and an output shaft that rotates in response to the rotational output of the reduction gear group, and the output shaft A drain cock at the bottom of the outer tank is opened in response to the rotational output of the output shaft, and a clutch boss is opened in response to the rotational output of the output shaft so that the dewatering tank, which also serves as a washing tub, in the outer tank can be rotated for dewatering. A drive device is provided with a clutch and a brake for releasing the dehydration tank from a braking state in response to the rotational output of the output shaft, and the dehydration rotation of the dehydration tank and the rotation of the pulsator in the dehydration tank are performed by switching the clutch. A motor is provided, and the drive circuit of the drive motor is provided with a switch that is closed to energize the drive motor during the dehydration process, and the small electric device and the switch are housed in a resin case with electrical insulation properties. A driving device for a washing machine, characterized in that the drive device is housed inside the case and is attached to the bottom of the outer tub or the bottom of the outer tub of the case.