JP2648024B2 - Drum type washing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drum type washing machine.

[0002]

2. Description of the Related Art As a conventional example, an outer tub is provided in a frame, and a drum is rotatably supported in the outer tub. The drum-type washing machine that rotates in the direction
No. 45836 (D06F33 / 02).

[0003]

In the conventional example, the entanglement of clothes in the drum is suppressed by inverting the drum when washing is easy. In other words, if the drum continues to rotate in one direction, there is no change in the direction of rotation of the clothes in the drum, so the clothes gradually become entangled. Is not performed smoothly.

[0004] However, the harmful effects of continuing to rotate the drum in one direction are less frequent, but
The same can be said at the time of the dehydration operation, and if the rotation direction immediately before the end of the washing process is the same as the dehydration rotation direction,
Substantially, the rotation time in one direction is prolonged, and the probability of the clothes being entangled is increased.

[0005]

The present invention relates to an improvement in a drum type washing machine,
It is intended to suppress the entanglement of clothing and reduce the adverse effects of entanglement.

[0007]

SUMMARY OF THE INVENTION According to the present invention , a dehydration step is performed after each of a washing step and a rinsing step. An outer tub provided in a frame and a rotatable inside the outer tub are provided. is supported, the positive and the horizontal axis type drum, the drum during the washing and rinsing process at a low speed with a large number of dehydration holes around
Roll and reverse, and raise the drum during the spin-drying process.
Motor that rotates in one direction at high speed, and through this motor
Control the rotation of the drum, in the process before the dehydration process
While determining the rotation direction of the drum immediately before the end,
In the direction opposite to the determined drum rotation direction, the dehydration process
And control means for rotating the drum .

[0008]

[0009]

In other words, the rotation direction at the start of dehydration is opposite to the rotation direction at the end of rinsing and rinsing. There is no time.

[0010]

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings.

In FIG. 4, 1 is a frame, 2 is a spring 3 and a shock absorber 2 in the frame 1.
The outer tub 5 elastically supported by the bars 4 is a horizontal-axis type drum rotatably supported in the outer tub 2 and has a large number of through holes 6 around it. Reference numeral 7 denotes a drive pulley fixed to the rotating shaft of the drum 5, and reference numeral 8 denotes a drive motor fixed to the outer bottom of the outer tub 2. The drive pulley 7 has a small pulley 9 and a belt 10 Are connected via 11
Is a vibration detection switch provided on the upper portion of the outer tub 2, and a case having mercury and a contact therein is provided in the outer tub 2.
And the centrifugal force of the amplitude and the swing speed of the outer tub 2 during the spin-drying operation, and mercury comes into contact with the contacts and conducts, thereby detecting excessive swing of the outer tub 2. I do.

FIG. 5 shows a control mechanism centered on a microcomputer 12 (hereinafter referred to as a microcomputer) in the present embodiment. The microcomputer 12 includes an input key circuit 13 composed of various input key groups, Based on information from the water level sensor 14, the vibration detection switch 11, and the like, the operation of the water supply solenoid valve 15, the drain solenoid valve 16, the buzzer device 17, the display device 18, the inverter circuit 19, and the like is controlled.

The configuration of the microcomputer 12 is well known and will be described with reference to FIG. The microcomputer 12 has a C
PU20 (central processingun
it), RAM 21 (random accessme)
memory), ROM 22 (read only mem)
ory), a timer 23, a system bus 24, and input / output ports 25 and 26.

The CPU 20 comprises a control unit 27 and an arithmetic unit 2
The control unit 27 fetches and executes an instruction, and the arithmetic unit 28 transmits data given from an input device or a memory by a control signal from the control unit 27 in the execution stage of the instruction. Then, arithmetic processing such as binary addition, logical operation, increase / decrease, and comparison is performed. The RAM 21
Is for storing data about the device,
The ROM 22 is pre-loaded with means for operating the device, setting conditions for determination, rules for processing various information, and the like.

The inverter circuit 19 applies an electric signal obtained by converting a direct current to an alternating current having a predetermined frequency to the drive motor 8 in accordance with a signal from the microcomputer 12 as is well known in the art. Change the rotation speed.

The operation based on such a configuration will be described with reference to FIGS. The washing machine of the present invention has a program including a washing step, an intermediate dehydration step, a rinsing step and a final dehydration step.
It is executed sequentially under the control of the microcomputer 12. In the washing or rinsing step, the drum 5 (drive motor 8)
Is inverted at a low speed after a pause, and in the dehydration process,
The drum 5 is rotated at a high speed.

In FIG. 1, a discrimination flag C1 is for discriminating whether the drum 5 (drive motor 8) is to be rotated clockwise or counterclockwise during the washing or rinsing step. = 1), the drum 5 is instructed to rotate clockwise. The discrimination flag C2 is for discriminating whether or not the drive motor 8 has just been started during the washing or rinsing step, and is reset immediately after the start (two seconds after the start) (C2 = 0). This is reset when the drive motor 8 is stopped. The determination flag C3 is for determining whether the spinning rotation is right rotation or left rotation, and is set at the time of right rotation.

In FIG. 1, when the washing or rinsing step is started, first, the flags C1 and C2 are reset (S-1), and the number of revolutions for washing rotation is set in the inverter circuit 19 (S1). -2) After setting C2 again (S-
3) The drum 5 is slowly inverted at a predetermined inversion cycle (S-1) to (S-13). During this time, the flags C1, C2
Is set or reset each time the situation switches.

After the elapse of the washing time, the dehydration program shown in FIG. 2 is executed. That is, when starting the dehydration, the microcomputer 12 checks the state of the flags C1 and C2 (S12).
-20) to (S-22), as shown in Table 1, the rotation direction during dehydration is determined.

[0021]

[Table 1]

That is, basically, when the final rotation direction of the washing process is right rotation (C1 = 1), the dehydration start direction is set to the left, and when the final rotation direction is left rotation (C2 = 0), the dehydration start direction is set to the right. I do.
Accordingly, the rotation direction of the drum 5 is switched when shifting from the washing process to the dehydration process, so that the rotation time of the drum 5 in one direction does not increase.

However, when the final rotation of the washing process is completed immediately after the start (C2 = 1), it is regarded that the rotation is substantially not performed, and the direction immediately before the rotation, that is, in the washing process, is determined. The dehydration start direction is determined for the direction opposite to the final rotation direction.

In the dehydration step, the drum 5 is rotated at a low speed for several seconds, and then the rotation is shifted to a high speed. When the dehydration start direction is determined, the flag C3 is set to that direction (S-23).
24) First, the drum 5 is activated in the set direction for the balance operation (S-25) to (S-28).

After a lapse of 5 seconds, the washing water in the outer tub 2 is drained (S-29) (S-30). When the water level in the tub drops to the reset water level, the operation shifts to high-speed one-way rotation. (S-31) (S-32), centrifugal spin-drying is performed within the set time.

When the abnormal vibration detection switch 11 is operated during the low-speed rotation, the rotation is temporarily stopped (S-
33) (S-34), the oscillation of the outer tub 2 is calmed, and then the outer tub 2 is started again. In this case, the drum 5 is started in the direction opposite to the previous rotation direction.

If the above-mentioned dehydration operation is performed immediately after the washing process, the process proceeds to the rinsing process after the completion of the dehydration. At this time, the microcomputer 12 operates as shown in FIG. The state of the flag C3 is checked, and the drum is started in the same direction as the spinning rotation. In other words, since the spinning speed is high, the coasting rotation time is long, and if the start of the rinsing step is performed in the opposite direction to the spinning direction, it is necessary to wait until the coasting rotation is completed. This is because if the start of the rinsing step is set to be the same as the spinning direction, the necessity is eliminated.

[0028]

As described above, the washing and rinsing steps are completed.
If the previous drum rotation direction and the spinning rotation direction are the same,
Opportunity to unravel clothing entangled in the washing, rinsing process
Strong rotational force in the same direction in the dehydration process without
However, the entanglement of clothing may be promoted,
According to the configuration of the ram-type washing machine, the drum is suddenly added during the spin-drying process.
Prevent the problem of entanglement of clothing even when speeding up
Can be. Therefore, since the structure prevents the clothes from being entangled during the transition from rinsing to rinsing, the clothes in the drum are less likely to be deflected during the spinning rotation, and the spinning operation can be performed smoothly.

[Brief description of the drawings]

FIG. 1 is a flowchart showing a washing operation of a drum type washing machine according to the present invention.

FIG. 2 is a flowchart showing a dehydrating operation.

FIG. 3 is a flowchart showing an operation at the time of shifting from dehydration to rinsing.

FIG. 4 is an internal mechanism diagram.

FIG. 5 is a block diagram of a control mechanism.

FIG. 6 is a configuration diagram of the microcomputer.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Frame 2 Outer tank 5 Drum 6 Through-hole (dehydration hole) 8 Motor 11 Vibration detection switch (vibration detection means) 12 Microcomputer (control means) 19 Inverter circuit (driving means by 8 and 19) Make up)

Claims (1)

(57) [Claims] A dewatering step is performed after each of a washing step and a rinsing step. An outer tub provided in a frame, and an outer tub rotatably supported in the outer tub, and Horizontal drum having a large number of dehydration holes in the washing and rinsing process
The drum is rotated forward and backward at a low speed, and
A motor that rotates the drum in one direction at high speed during the spin-drying process
And the rotation control of the drum via this motor,
Rotation of the drum immediately before the end of the process before the dehydration process
The disc rotation direction is determined, and the determined drum rotation
In the dehydration process, rotate the drum in the direction opposite to the
Drum type washing machine, characterized in that it comprises a Mel control means.