JPH0513351Y2 - - Google Patents

Description

[Detailed explanation of the idea] (b) Industrial application fields The present invention relates to a washing machine.

(b) Conventional technology Conventionally, during the washing process, the rotation period of the rotary blades is changed regularly or irregularly to form a complicated water flow in the washing tub, thereby increasing the movement of the laundry. Various types of washing machines have been proposed to improve the cleaning effect.
In the washing machine disclosed in Publication No. 68090 (D06F 33/02), the rotation time of the rotor blades in the forward and reverse directions is divided into successive short periods with rest periods, and these short periods are divided into short periods of time in the previous stage. It's shorter than the time.

(c) Problems that the invention aims to solve In conventional washing machines, the stirring time is the same when rotating forward or backward, and the recoil when reversing is rapid and the stirring force is strong. For delicate and perishable items such as underwear and wool products, excessive agitation may occur, and there is a risk of damaging the fabric.

In view of these problems, the present invention provides a washing machine suitable for washing perishable laundry.

(d) Means for Solving the Problems The washing machine of the present invention is provided with a reversal control circuit that repeats a cycle in which the drive motor of the rotor blades is energized intermittently in one direction and then in the other direction. Each energization time and de-energization time were set to a short period of several seconds, the de-energization time was set to be longer than the energization time, and the number of times of energization in one direction during the cycle was set to be greater than the number of times of energization in the other direction. It is something.

(e) Action: Provides the main stirring action when rotating in one direction,
Rotation in the other direction should be sufficient to untangle the laundry.

In other words, in unidirectional rotation, the stirring force is alleviated by rotating the rotor blades intermittently, and the impact when the rotor blades are started is reduced by applying electricity before the rotor blades stop rotating due to inertia due to a power outage. weaken, resulting in a water flow suitable for perishable laundry.

(f) Examples Examples of the present invention will be described based on the drawings.

In the two-tub washing machine shown in Figure 3, 1 is the machine frame, 2
is a synthetic resin washing tub installed inside the machine frame 1,
Although not shown in the drawings, the washing tub 2 is provided with an outer dehydration tub juxtaposed therewith. Reference numeral 3 denotes an operation box provided at the rear of the upper part of the machine frame 1, in which various operation switches, a water supply unit, a drain valve operation mechanism, etc. are housed. Reference numeral 4 denotes a large-diameter rotary blade that is disposed at the center of the bottom of the washing tub 2 and occupies most of the bottom area of the washing tub 2, and is driven to be reversed left and right by a drive motor (not shown). 5
Reference numeral 1 indicates an operation unit provided above the washing tub 2, 6 indicates an upper water supply port, 7 indicates a water supply channel cover that covers a lower water supply channel (not shown), 8 indicates a lower water supply port provided on the cover 7, and 9 indicates an upper water supply port. , an overflow cover that covers an overflow chamber (not shown), 10 a washing top lid, 11 a dehydration top lid, 1
2 is the drain hose, 13 is the dehydration timer knob, 1
4 is the wash timer knob, 15 is the water flow strength (strong or
This is a push-button selection button for selecting soft water flow, and when it is in the pressed state, soft water flow is selected.

Now, Figure 1 shows a specific circuit of a washing machine.
6 is a dehydration drive motor, 17 is a dehydration timer, 1
8 is a safety switch that opens and closes in conjunction with the opening and closing operations of the dehydration top lid 11; 19 is a switching contact that switches in conjunction with the operation of the water flow selection button 15; it is normally on the A contact side, and is used to select the soft water flow; switches to the b contact side. 20 is a drive motor for the rotary blade 4, and 21 is a reversing cam contact S-1 of the drive motor 20, which is connected in series to the a contact of the switching contact 19. This reversing cam contact S-1,
As shown in FIG. 2A, the drive motor 21 is switched in the cycle of 12 seconds forward rotation, 3 seconds pause (neutral), 12 seconds reverse rotation, and 3 seconds pause, so that the drive motor 20 (rotor blade 4) changes accordingly. The rotation is reversed, and a strong water flow is formed in the washing tub 2.

Also, 22 is a reversing cam contact S-3 connected to the drive motor 20, and the switching contact 19
It is connected in series to the b contact of , via opening/closing cam contacts S-2 and S-23. Said opening/closing contact S-2, 2
3 is 1.1 seconds ON - 5.6 seconds OFF as shown in Figure 2 B.
After repeating times (total 33.5 seconds), 1.1 seconds ON - 7.7 seconds OFF
It opens and closes in a cycle that repeats 3 times (26.4 seconds in total). Further, the reversing cam contacts S-3 and 22 are switched at a cycle of 33.5 seconds forward rotation and 26.4 seconds reverse rotation as shown in FIG. 2C.

That is, while the cam contacts S-3 and 23 are switched to the forward rotation side, the drive motor 20 is energized five times every 5.6 seconds, and while the cam contacts S-3 and 23 are switched to the reverse rotation side, the drive motor 20 is energized every 7.7 seconds. It is energized three times.

Therefore, in this soft water flow, the rotor 4 rotates intermittently in the same direction multiple times, so the stirring force is relatively relaxed, and the pause time of 5.6 seconds or 7.7 seconds is due to the inertia rotation stopping. Since the time is in a range where there is no nuisance, the impact at the next startup is weakened, making it suitable for washing perishable laundry items such as underwear and wool products.

In addition, in the soft water flow, reverse rotation is inserted with fewer ON times than forward rotation to loosen the tangles of laundry, and by increasing the OFF time during reverse rotation, the reaction when transitioning to the next forward rotation is reduced. It's easing.

Figure 4 shows the effect of soft water flow verified through experiments.

As a conventional example, a device is used in which the number of times of energization and the time of energization in the forward and reverse directions are equal. The degree of cloth damage refers to the degree of decrease in the weight of the test cloth after washing, and the lower the degree, the less damage to the cloth.

In addition, the reversing cam contacts S-1, S-3, and 2
1 and 22 and opening/closing contacts S-2 and 23 are built into the washing timer 24.

(g) Effects of the invention According to the washing machine of the invention, the cycle of intermittent energization in one direction and then intermittent energization in the other direction is repeated, and each energization time and power-off time can be shortened to a few seconds. In addition to making the power-off time longer than the power-on time, it is possible to reduce the agitation force and obtain a soft water stream suitable for washing perishable laundry items such as underwear and wool products. .

Furthermore, the number of times of energization in one direction is set to be greater than the number of times of energization in the other direction, and laundry can be untangled during reverse rotation when the number of times of energization is small.

[Brief explanation of drawings]

Figure 1 is an electrical circuit diagram of the washing machine of the present invention, Figure 2 is a time chart showing the operation of each timer contact,
FIG. 3 is a partially cutaway perspective view of the washing machine, and FIG. 4 is a characteristic diagram of the degree of cloth damage. 2... Washing tub, 4... Rotating blade, 20... Drive motor, 22... Reversing cam contact, 23... Opening/closing cam contact (22 and 23 constitute a reversing control circuit).

Claims (1)

[Scope of utility model registration request] In a washing machine in which the rotary blades disposed in the washing tub are rotated in the forward and reverse directions by a drive motor, a reversal cycle in which the drive motor is intermittently energized in one direction and then intermittently energized in the other direction is repeated. A control circuit is provided to set each energization time and de-energization time to a short period of several seconds, to make the de-energization time longer than the energization time, and to set the number of times of energization in one direction during the cycle to the number of times of energization in the other direction. A washing machine characterized by having more settings.