JPS6315877B2 - - Google Patents

Description

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

Conventionally, this type of device uses a solenoid, and has a structure in which the plunger of the solenoid directly pulls and tensions an operating body such as a drain pot, clutch, brake, etc. Therefore, when the solenoid is energized, the plunger of the solenoid is suddenly attracted and collides with the core of the solenoid, producing extremely loud noise. 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. It was hot.

Therefore, a proposal has been made to use a small electric motor instead of using a solenoid, and use the rotation of the motor to open the drain cock, clutch, brake, etc.

This device uses the rotational output of a small electric motor to
Prior to the dewatering process, the three parts are removed: the drainage tank at the bottom of the outer tank, the brake that applies a braking action to the dehydration tank in the outer tank, and the clutch that prevents the transmission of rotational force to the dehydration tank during washing. It also opens up the world.

However, opening these three parts does not mean that the dewatering process can be performed, and a switch that rotates the drive motor is required to rotate the dewatering tank. Moreover, if this switch is provided independently of the operations and configurations of the three above, it goes without saying that ease of assembly will be poor, and especially when the switch is incorporated into a time switch, the time switch will be difficult to assemble, especially when the switch is incorporated into a time switch. This makes the switch even more complicated, which is undesirable.

FIGS. 1 to 4 show a conventional washing machine equipped with a solenoid for operating a drain, etc., and this will be explained below.
A plurality of outer frame receivers 2 are fixed to the upper part of an outer 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 built-in vibration-proof spring (not shown), and this buffer tube 5 slides between the outer tank holder 6 and elastically attaches to plastic or the like. An outer tank 7, which also serves as a water tank, is suspended and supported. 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 in a watertight manner. 10 is a motor for driving the washing machine, and 11 is a clutch device for pulling a clutch and the like.

Figure 2 shows the details of the clutch device, and the biasing force of the clutch spring (not shown) causes the clutch pawl 1 to
2 is engaged with the clutch boss 13, the clutch spring idles, and when the clutch pawl 12 is disengaged from the clutch boss 13, the washing machine drive motor 10 is activated by the solenoid 14 whose operation is controlled by the control switch. The rotational force is transmitted to the dehydrating shaft, and the dehydrating tank 7a, which also serves as a washing tub, performs dehydrating rotation. When the solenoid 14 is suctioning, the drain pot 15 at the bottom of the outer tank 7 and the brake 16 are also pulled at the same time.

Next, the operation of the washing machine will be explained based on the electrical circuit diagram shown in FIG. 3 and the program chart shown in FIG. 4.

17 is the power supply, contact point of automatic time switch 18
When _T1 is turned to the a side, the water supply valve 20 is energized from the NC side of the pressure switch 19 through the a side of the contact _T5 , and water flows into the outer tank 7. When the water reaches a certain level, the pressure switch 19 is activated.
Switching from the NC side to the NO side, the capacitor 21 and the drive motor 10 are energized from the contacts T ₄ a → T ₆ a → T ₈ (automatic reversing contacts) of the automatic time switch 18, and the pulsator in the dehydration tank 7a starts rotating and washing begins. At this time, the timer motor 23 is also energized at the same time, and the program begins to move.

Next, drain water from contact T ₁ of automatic time switch 18.
of a→NO side of pressure switch 19→a of contact _T4 →
The solenoid 14 is energized via _T6b .
When pressure switch 19 is set to NC side, contact _T5
b→lid switch 22→contact T6 The solenoid 14 is energized via b of ₆ and water is drained. 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 T ₁ of automatic time switch 18
a→NC side of pressure switch 19→b of contact _T5 →
Lid switch 22→b of contact _T4 →a of contact _T9 (automatic reversal contact)→a of contact _T2 →Electrification is applied to the drive motor 10 via the capacitor 21. 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 ₈ and T ₉ are automatic reversing contacts, which 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 simultaneously.

Next, dehydration is carried out for a certain period of time by turning off the contact _T4 of the automatic time switch 18 from the connected state of intermittent dehydration and turning on the contact _T7 b instead.

Next, rinsing is almost the same as washing, but the difference is that when the rinse changeover 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 - draining - spin-drying - rinsing. If the drain/spin stop switch 25 is not turned on at the end of the final rinse, the program will continue at the end of the rinse. If there is a pause and the switch 25 is turned on, the process proceeds to the next draining and spin-drying, and before the spin-drying is finished, the buzzer 26 sounds and the washing ends.

Automatic time switch 18 contacts during dehydration
The time A during which a of _T2 is cut off indicates the time period during which the motor 10 is de-energized and the dehydration tank 7a is rotated by inertia force. Water is poured into the dehydration tank 7 during the rinsing process.
By reliably stopping a, splashes can be prevented.

According to the configuration of the conventional washing machine described above, the drain pot 15, the clutch device 11, and the brake 16 are operated by the operation of the solenoid 14, and when the solenoid 14 is energized, its plunger suddenly causes suction. and collides with the core of the solenoid 14, producing an extremely loud sound. This sound was transmitted to the outer frame 1, etc., and generated unpleasant echoes and resonance sounds.

Therefore, as mentioned above, it has been proposed to use a small electric motor in place of the solenoid, but this also complicates the operational and structural relationship between the drive motor control switch and the small electric motor. It is undesirable.

The present invention uses a small electric motor in place of the solenoid described above, and improves the operational and structural relationship between the small electric device, which mainly includes the small electric motor and a group of reduction gears, and the switch that controls the drive motor. By doing so, the operational reliability is improved, and the output shaft protrudes through the lid of the case in which the small electric device and the switch are housed.
By connecting this projecting end to the drain pot, clutch, and brake, the structure can be made extremely compact, and the opening operation of the drain pot, clutch, and brake, and the closing operation of the switch can be performed reliably. This provides a drive structure that is difficult to intrude into the interior and has excellent electrical insulation properties.

Embodiments of the present invention will be described below with reference to FIGS. 5 to 7. Note that in this figure, the same reference numerals as in FIGS. 1 to 4 indicate the same members, so the explanation 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, a small electric motor 29 of the small electric device 28
The rotation is transmitted from the reduction gear group 30 to the output shaft 31, the cam 32 fixed to the output shaft 31 rotates, and the contact plate 33 in contact with the cam surface 32a of the cam 32 operates with the contact board 37 as a fulcrum. Then, the contact 36 provided on the contact plate 33 is closed to the contact 35 of the contact plate 34. Note that the switch 27 is connected to the contact plate 33,
34, contacts 35, 36, and a contact board 37. The cam 32 rotates in the direction shown by the arrow B in FIG. 7A, and the drain pot 15, clutch boss 13, brake 16, etc. are opened at the notched portion 32b.

Now, the transmission cam 38 fixed to the output shaft 31 is rotated, and by the rotation of the transmission cam 38, the wire 39 connected to the wire 39 at one end is pulled in the direction of arrow A, and the drain cock 15 and the clutch boss 13 are pulled. Then, the brake 16 and the like are released to switch between washing and spin-drying. When the switch 27 is closed by the cam surface 32a of the cam 32 of the output shaft 31, the drainage cock 15, clutch boss 13, brake 16, etc. have already been opened by the transmission cam 38, and conversely, the drainage When the lock 15, clutch boss 13, brake 16, etc. are not released, switch 27
is starting to be developed.

Therefore, according to the circuit configuration shown in Fig. 5, the contact point of the automatic time switch 18 that is turned on when draining or dewatering.
The small electric device 28 is energized from _T6b , and the switch 27 is closed after a certain delay time. Although the switch 27 does not normally need to be configured in a program such that it closes after a delay time due to the presence of waste water before dewatering, it is necessary in the following cases.
That is, when the washing lid 1a is opened and the lid switch 22 is opened in the middle of the dewatering process, and then the washing lid 1a is closed again and the lid switch 22 is closed, the rotational speed of the output shaft 31 of the small electric device 28 is slow. Therefore, the clutch boss 13, brake 16, etc. are not released, and in this state, an excessive load is applied to the drive motor 10.

Therefore, a 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 contact _T2 of the automatic time switch 18, which is turned on during dehydration. Accordingly, the drive motor 10 can be energized after the clutch boss 13, brake 16, etc. are released. 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 that houses the small electric device 28. For example, if it is molded with a thermoplastic molding material such as glass-reinforced polypropylene, glass-reinforced polyester, polyacetal, or nylon, production is possible. This not only improves electrical insulation performance but also provides waterproof and moisture-proof effects. case 40
A small electric motor 29 is housed inside the bottom part 41, and a reduction gear group 30 and a main plate 4 are installed on the open side.
2. 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 body 43 to the outside of the case 40, and this projecting end is connected to the transmission cam 38 via the transmission cam 38.
It is connected to the drainage pot 15, clutch, and brake 16. Further, the case 40 is attached directly to the bottom of the outer tank 7 or to the substrate 8.

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. established,
A drainage pot at the bottom of the outer tank is opened in response to the rotational output of the output shaft, and a clutch boss is arranged so that the dewatering tank serving as a washing tub in the outer tank can be rotated for dewatering in response to the rotational output of the output shaft. A clutch for opening 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 rotation of the dehydration tank and rotation of a pulsator in the dehydration tank are performed by switching the clutch. 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 dehydration process, and the small electric device and the switch are housed in a resin case having electrical insulation properties. The opening of the case is closed with a lid, and the output shaft is made to protrude outside the case through the lid, and the protruding end of the output shaft is connected to the drain pot, clutch, and Since it is connected to the brake, it goes without saying that there is no shocking abnormal noise caused by the use of conventional solenoids.
Since the drive motor control switch is not incorporated into the time switch, the complicated time switch structure does not become even more complicated.
Furthermore, the rotation output of the output shaft protruding from the lid of the case can be used to open the drain, the clutch, and the brake, and the output shaft can be easily connected to the three. Moreover, there is almost no fear of water intrusion inside the case, and the occurrence of problems such as electrical leakage and deterioration of electrical insulation performance can be prevented.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view of a conventional common washing machine;
The figure is a partial cross-sectional top view showing the structure for controlling the drainage pot, brake and clutch;
Figure 4 is an electrical circuit diagram of the washing machine, Figure 4 is a diagram showing the operating program of the time switch, Figure 5 is an electrical circuit diagram of the washing machine according to an embodiment of the present invention, and Figure 6 is the drain drain of the washing machine. , a partial cross-sectional top view showing the structure for controlling brakes, clutches, etc., Figure 7 shows a small electric device, Figure A is a top view with the lid removed, Figure B is the lid. FIG. 3 is a vertical sectional view showing the state in which the 7... Outer tank, 7a... Dewatering tank, 10... Drive motor, 13... Clutch boss, 15... Drainage pot, 16... Brake, 27... Switch, 2
9...Small electric motor, 30...Reduction gear group, 31...
...output shaft, 40...case, 43...lid body.

Claims (1)

[Claims] 1. 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 that receives the rotational output of the output shaft. a drainage cock at the bottom of the outer tank that opens when the output shaft is turned; a clutch that opens a clutch boss so that the spin-drying tank that also serves as a washing tub in the outer tank can be rotated for spin-drying in response to the rotational output of the output shaft; A brake is provided for releasing the dehydration tank from a braking state in response to the rotational output of the dehydration tank, and a drive motor is provided for rotating the dehydration tank and the pulsator in the dehydration tank by switching the clutch. The drive circuit of the motor is equipped with a switch that closes the drive motor to energize it during the dehydration process, and the small electric device and switch are housed in a resin case with electrical insulation properties. The opening is closed with a lid body, and the output shaft is made to protrude outside the case by penetrating the lid body, and the protruding end of the output shaft is connected to the drain pot, the clutch, and the brake. washing machine drive unit.