JPS6479B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an agitation type washing machine in which a washing drive motor is operated in forward and reverse directions to operate an agitation blade.

As is well known, stirring type washing machines wash by reciprocating the stirring blade installed at the center of the bottom of the washing machine at a predetermined angle. Conventionally, in order to generate this reciprocating movement, the rotation of the motor was controlled by a gear. The transmission is transmitted to the stirring blades via a link mechanism, etc., and is particularly suitable for large-capacity washing machines. However, the mechanism that generates the reciprocating motion is complex and expensive, making it difficult to adopt it for small washing machines due to cost considerations. It was hot.

Therefore, in recent years, in order to introduce this agitation method into small-sized washing machines, an agitation-type washer has been proposed in which a timer or the like is used to directly drive a motor in forward and reverse directions to perform reciprocating motion. However, this only controls the time of energization to the motor, and although it has the advantage of being inexpensive to manufacture, the reciprocating rotation angle of the stirring blades is not constant due to changes in the amount of laundry to be washed and the power supply voltage, etc. The drawback was that the performance could not be demonstrated.

The present invention has been made in order to eliminate the above-mentioned conventional drawbacks, and provides an agitation-type washer that can improve the reliability of washing performance by controlling the reciprocating rotation angle of the agitation blade to be constant. The purpose is to

Embodiments of the present invention will be described below with reference to the drawings.
In Figure 1 A and B, 1 is the outer box of the washing machine, 2
is a washing tank which is fixed inside the outer box 1 and performs washing;
3 is a main shaft that is watertightly inserted into the center of the bottom of the washing tank 2 and rotatably supported by a main bearing 4;
5 is a stirring blade attached to the main shaft 3 in the washing tank 2, 6 is a pulley attached to the lower end of the main shaft 3, and the pulley 6 has a plurality of detection holes 7 for detecting the rotation angle of the stirring blade 5. are provided circumferentially at predetermined intervals. Reference numeral 8 denotes a rotation angle detector, which is composed of a light emitting section 9 and a light receiving section 10. The light from the light emitting part 9 reaches the light receiving part 1 at the position of the detection hole 7 of the pulley 6.
Therefore, a pulse signal corresponding to the rotation angle of the pulley 6, that is, the rotation angle of the stirring blade 5, is emitted from the light receiving section 10. 11 is a washing drive motor attached to the bottom of the outer box 1; 12 is the motor 1;
Pulley 1 is attached to pulley 1, pulley 13 is attached to pulley 6, 12
It is a belt that connects the

FIG. 2 shows the configuration of the control system, and 14 is a control circuit, which is composed of a memory 15, an arithmetic processing unit 16, an input control 17, and an output control 18. is connected. The rotation angle detector 8 detects the rotation angle of the stirring blade 5, and this detection signal is input to the control circuit 14 via the input control 17, and this signal is processed and calculated by the memory 15 and the arithmetic processing unit 16. , are output to the motor 11 via the output control 18, and the motor 11 is rotated clockwise and counterclockwise by this output.

Next, the operation of the above-mentioned stirring type washer will be explained with reference to the flowchart shown in FIG. In the flowchart, step 102 is a reference rotation angle setting section that sets the reference rotation angle (the number of pulses corresponding to this rotation angle) of the stirring blade 5, and step 104 is a reference rotation angle setting section that sets the reference rotation angle of the stirring blade 5 (the number of pulses corresponding to this rotation angle).
Step 107 is a counter that counts the rotation angle of the stirring blade 5 (the number of pulses corresponding to the rotation angle), and Step 108 is a unit that determines whether the rotation angle of the stirring blade 5 is the reference rotation angle. Step 111 is a comparison section that compares whether the stirring blade 5 has been stopped due to the disappearance of the pulse signal from the rotation angle detector 8. Steps 113 and 114 are a comparison section that compares whether the rotation angle has been reached. This is an angle comparison section that compares the rotation angle until the stirring blade 5 stops. Further, steps 115, 116, and 117 are arithmetic units that add and subtract the reference angle and the rotation angle, put the result of the arithmetic operation in the X register, and control the energization of the motor 11 so that the rotation angle becomes the reference rotation angle.

To start washing, first place the items to be washed, water and detergent in the washing tank 2, and turn on the power switch 19. In step 101, a flag for executing clockwise rotation of the motor 11 is set to F=1. In step 102, the number N of pulses corresponding to the reference rotation angle of the stirring blade 5 is set, and in step 103, the value is entered into the X register. In step 104, it is determined whether the motor 11 is running in the forward or reverse direction, and since F=1, it is determined that the motor is rotating clockwise (forward), and the process moves to step 105.
Right rotation of the motor 11 is started. As a result, the pulley 6 also rotates, so the stirring blade 5 also rotates, and the rotation angle detector 8 generates a pulse signal. In step 107, this number of pulses is counted by a counter and entered into the T register, and in step 108, the contents of the T register and the X register are compared, and if T<X, the process returns to step 104 and the clockwise rotation of the motor 11 is continued. do. If T ≥ is further performed and placed in the T register.
In step 111, it is determined whether the stirring blade 5 has stopped based on the presence or absence of a pulse signal, and if it has not stopped, the process returns to step 110 and further counting is performed. If the stirring blade 5 stops, step
At 112, set the X register to zero. In step 113, the reference rotation angle pulse number N and the rotation angle pulse number T are compared, and if T>N, the process moves to step 115, where the arithmetic processing section calculates the pulse number (T-N) corresponding to the rotation angle exceeding the reference angle. ) is calculated, and the value obtained by subtracting ((TN) from the reference rotation angle pulse number N is placed in the X register. If T=N, the process moves to step 117 via step 114, and the pulse number N is stored in the X register. If T<N for some reason, proceed to step 116 via step 114, calculate the number of insufficient pulses (NT), and set the number of pulses N to (NT).
Put the added value into the X register. step 118
Since F=1, the process proceeds to step 119, where the forward/reverse operation flag of the motor 11 is cleared to F=0, and then, at step 121, the T register is also cleared, and the process returns to step 104. This time F=0, so
104, the process moves to step 106, and the motor 11
The counterclockwise (reverse) rotation operation of the stirring blade 5 is started, and the stirring blade 5 is rotated counterclockwise. Thereafter, the process is carried out in the same manner as when rotating clockwise, and the stirring blade 5 is washed, but when the cleaning is completed, the power switch 1 is turned on.
Continue the reciprocating motion until 9 is turned off.

As described above, in this embodiment, the excess or deficiency of the actual rotation angle of the stirring blade 5 with respect to the standard rotation angle during one rotation of the stirring blade 5 in forward and reverse rotation is compensated for during the other rotation. As a result, the reciprocating rotation angle of the stirring blade 5 becomes constant. Further, since the washing drive motor 11 is rotated in the reverse direction after the stirring blades have stopped, the stirring blades can be rotated back and forth without applying a large load to the motor 11.

As described above, in the present invention, the rotation angle of the stirring blade 5 is detected, and based on this detection signal, the rotation angle of the stirring blade is controlled to be almost constant. The reference rotation angle at the time of rotation of the other one is corrected by the amount of the deficiency, so the rotation angle becomes almost constant, and it is possible to eliminate unevenness in washing performance and improve the reliability of washing performance. Furthermore, since multiple expensive reciprocating motion generators are not used, a stirring type washer with a simple structure and low cost can be obtained. Furthermore, since the motor is rotated in reverse after the stirring blades are stopped,
It is possible to extend the life of the motor without placing a large load on the motor.

[Brief explanation of the drawing]

1A and 1B are respectively a vertical sectional front view and a cross-sectional bottom view taken along the line A-A of the device of the present invention, FIG. 2 is a configuration diagram of the control system of the device of the present invention, and FIG. 3 is an explanation of the operation of the device of the present invention. This is a flowchart for 2... Washing tank, 5... Stirring blade, 6... Pulley, 7... Detection hole, 8... Rotation angle detector, 11
... Washing drive motor, 14 ... Control circuit.
Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1. In an agitating washing machine that performs washing by alternately forwarding and reversing the stirring blades in the washing tank by forward and reverse operation of the washing drive motor, there is a rotation angle detection unit that detects the rotation angle of the stirring blade, and a reference rotation of the stirring blade. A setting part for setting the angle, an energization stopping means for stopping energization to the motor when the stirring blade reaches a reference rotation angle, and a setting part for setting the rotation angle with respect to the reference rotation angle when the stirring blade reaches one of the forward and reverse rotations. A stirring type washing machine characterized by comprising a correction means for correcting the reference rotation angle when the other rotation is performed by the excess or deficiency, and a rotation direction control means for rotating the motor in the reverse direction when the stirring blade stops.