JPS6326673B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field 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 and an agitation blade is reciprocated.

PRIOR TECHNOLOGY As is well known, an agitating washing machine washes clothes by reciprocating an agitating blade installed at the center of the bottom of the washing tub at a predetermined angle. A rotary reciprocating conversion mechanism such as a link mechanism is used, and the conversion mechanism converts the rotation of the motor into reciprocating motion and transmits it to the stirring blade. However, although this mechanical washing machine is particularly suitable for large-capacity washing machines, the mechanism for generating reciprocating motion is complex and expensive, so it has been difficult to adopt it for small-sized washing machines.

Agitation type washing machines shake the laundry in the washing tub by rotating the agitation blades back and forth to the right and left at a rotation angle of around 200 degrees, 50 times per minute, and 60 times per minute at most. Although it uses dynamic agitation to wash clothes, its cleaning power is one step ahead of the currently mainstream whirlpool type washing machines.
It was also expensive, so it disappeared from Japanese households.

Improving the washing tub and stirring blades could be considered as a means to increase the cleaning power, but it is not very effective.
The most effective method is to increase the number of times the stirring blade moves back and forth per minute.

However, as the number of reciprocations of the stirring blade increases, the movement of the laundry, or in other words, the inertia, increases, and when the stirring blade rotates from right to left or from left to right, the above inertial force causes resistance to the stirring blade. As a result, the impact on the rotary reciprocating conversion mechanism becomes severe, making it unsuitable for use as a home appliance for general household use. In addition, in order to withstand this impact, the mechanical strength of the stirring blades, rotational reciprocating conversion mechanism, reduction gear, and required torque of the motor must be significantly increased, which increases the size of the drive mechanism and increases costs. It had the disadvantage of becoming.

Therefore, in recent years, in an effort to introduce this agitation method to small washing machines, the motor is directly operated in forward and reverse directions using a timer, etc., and the agitation blades are rotated and reciprocated to oscillate and agitate the laundry. An agitating washing machine has been proposed. This method only controls the time of energization to the motor, and while 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, power supply voltage, etc. ~3
It may also rotate.

Furthermore, during no-load operation with no laundry or when there is little laundry, it takes a long time from the time when power is cut off to the motor until the inertial rotation stops.On the other hand, when there is a lot of laundry, the laundry causes resistance and inertia The time until rotation stops is short. Therefore, it is necessary to set the stop time to match the no-load operation, which takes the longest time to stop, and if there is a large amount of laundry to be done, the time from when the motor is de-energized to when it starts running in reverse rotation is necessary. This resulted in wasted time and inefficient washing.

Summary of the Invention The present invention has been made to eliminate the above-mentioned drawbacks, and includes a rotation angle detection means for detecting the rotation angle of the stirring blade, and a control means for controlling the motor using a signal from the detection signal. , the stirring blade is configured to rotate reciprocatingly at a predetermined energization rotation angle, and the motor is rotated in the reverse direction after the stirring blade substantially stops after the energization is cut off, and the energization of the motor is controlled in advance in a timed mode; The presence or absence of a detection signal from the rotation angle detection means, that is, the state of the rotation angle detection means is determined, and then the motor is controlled based on the detection signal, and further, the point in time when the rotation angle detection means becomes abnormal. From this, the motor is configured to be controlled in forward and reverse rotation in the timed mode.

This makes it possible to automatically set the number of reciprocations according to the load, for example, when the load is large, the inertia rotation angle is small and the time until the stirring blade generally stops is short, so the reciprocation time is shortened. To provide an agitation type washing machine with improved safety and washing efficiency, in which the agitation blades do not continue to rotate but reciprocate in a predetermined timed mode even if the rotation angle detection means is abnormal. purpose.

Embodiment of the Invention Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

In Figures 1A and B, 1 is the outer box of the washing machine, 2
is a washing tub for washing, and the washing tub 2 is fixed to the outer box 1. 3 is a main shaft that is watertightly inserted into the center of the bottom of the washing tub 2 and is rotatably supported by a main bearing 4; 5 is a stirring blade attached to the main shaft 3 in the washing tub 2; 6 is the lower end of the main shaft 3 The pulley 6 is provided with a plurality of 12 detection holes 7 circumferentially at predetermined intervals, for example, 30 degrees, for detecting the rotation angle of the stirring blade 5.

Reference numeral 8 denotes a rotation angle detector which functions together with the pulley 6 as rotation angle detection means, and is composed of a light emitting section 9 and a light receiving section 10. The light from the light emitting unit 9 is received by the light receiving unit 10 at the position of the detection hole 7 of the pulley 6, and therefore the rotation angle of the pulley 6, that is, the stirring blade 5
A pulse signal corresponding to the rotation angle is emitted from the light receiving section 10. That is, one pulse signal is generated corresponding to a rotation angle of 30 degrees.

Reference numeral 11 is a washing drive motor attached to the bottom of the outer box 1, 12 is a pulley attached to the motor 11, and 13 is a belt connecting the pulleys 6 and 12. When the motor 11 is rotated, the stirring blade 5 is rotated via the pulleys 6, 12 and the belt 13.

FIG. 2 shows the configuration of the control system of the device of this embodiment,
14 is a control circuit as a control means, and memory 1
5, an arithmetic processing unit 16, an input control 17, and an output control 18. The control circuit 14 is connected to a power source via a power switch 19. 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. , a control signal is output to the motor 11 via the output control 18, and this output causes the motor 11 to rotate clockwise and counterclockwise.

FIG. 3 is a flowchart showing the operation of the above-mentioned apparatus, particularly its control system. Step 100 is a forward/reverse operation flag for the motor 11, so that the motor 11 rotates clockwise at the start of operation. Step 101 is an energization pulse setting section that sets the energization rotation angle of the stirring blade 5, and the pulse number N corresponding to the rotation angle (for example, specifically, the energization rotation angle of the stirring blade 5 is set to 210 degrees and one pulse is 30 degrees). The number of pulses N is set to 7 because it is the resolution. Steps 102 and 103 are motor energization time and energization stop time setting units, respectively, in which the energization time TM1 and the energization stop time TM2 are set. (For example, specifically, TM1 is set to 300 ms and TM2 is set to 500 ms.) In step 104, the number of energizing pulses N is input to the register, and in steps 105 and 106, the energizing time TM1 and the stopping time TM2 are input to the registers Y1 and Y2, respectively. is input. In step 107, the time count register TM and pulse count register P are each set to zero. Step 108 is a forward/reverse operation switching section for the motor 11; Step 109 is a pulse determining section that determines whether the pulse count register P is being added; Steps 110 and 115 are a counting section that counts the time limit; Step 11
Reference numerals 1, 116, and 119 are counting units that count the number of pulses (one pulse for every 30° rotation angle) proportional to the rotation angle of the stirring blade 5, and the count values are input to registers TM and P, respectively. Step 112 is an energization time determination section that determines whether the time limit has reached the energization time, step 117 is a stop time determination section, and steps 118 and 141 clear the register P to zero. Step 120 is an angle determination section that determines the energization rotation angle of the stirring blade 5; step 122;
Step 12 is a stop determination unit that determines whether the stirring blade 5 has almost stopped, that is, whether a pulse signal generated by inertial rotation has been generated within a predetermined time period of 150 ms.
3 is a forward/reverse operation determination unit for the motor 11, step 12
4 sets flag F to 1, step 125 sets flag F
is set to zero, and step 126 clears register TM to zero. Step 140 is an abnormality determination section, and while the motor 11 is energized, a pulse signal is generated and added to the register P, and the next pulse signal is generated for 150 ms.
Determine whether it occurred between.

Next, the operation of the above device will be explained. First, the laundry,
Put water and detergent into the washing tub 2 and turn on the power switch 19. Then, in step 100, a forward/reverse operation flag F is set to 1 (clockwise rotation). Further, in step 101, energizing pulse N=7 is set, and in step 104, register X=7 is set. Then, in steps 102 and 103, the energizing time TM1 and the stopping time TM2 (TM1=
300ms, TM2=500ms) is set, and step 1
Registers Y1 and Y2 are set at 05 and 106, respectively.
Set to 300ms, 500ms. Step 107
Then, the time count register TM and further the pulse count register P are cleared to zero, and the initial setting is completed.

Next, the process proceeds to step 108, and since the forward/reverse operation switching section is F=1, the process proceeds to step 131, where the motor 11 is driven to the right (forward), the stirring blade 5 is also rotated to the right, and washing is started. Then, in step 109, since the pulse count register P=0, the flow advances to steps 110 and 111, the time limit is counted, the rotation angle of the stirring blade 5 is detected by the rotation detector 8, and the pulse signal is transmitted to the register P.
will be added to. Then, the process proceeds to step 112, the energization time determination section, where the value of register Y1 and the register
Compare the values of TM and find that TM<Y1, that is, the energizing time
If the time has not reached 300 ms, the process returns to step 110 and the motor 11 continues to rotate clockwise. Also,
When TM≧Y1, that is, the energization time reaches 300 ms, the time limit register TM is cleared to zero in step 113, and the process proceeds to step 114, where the energization to the motor 11 is stopped.

During this time, the stirring blade 5 rotates approximately 150 degrees, a pulse signal is generated from the rotation angle detector 8, and the register P
becomes 5. From this point on, the stirring blade 5 starts to rotate inertia, the time limit is added to the time count register TM, the rotation angle of the stirring blade 5 is detected by the rotation detector 8, and its pulse signal is added to the register P. Then, the process proceeds to step 117, a stop time determination section, where the value of register Y2 and the value of register TM are compared, and if TM<Y2, that is, the stop time has not reached 500 ms, the process returns to step 115, and the energization to the motor 11 is stopped. Continued. And TM≧
Step 1 when Y2, that is, the stop time reaches 500ms
Proceeding to step 23, the forward/reverse operation determination section of the motor 11 determines that F=
Since it is set to 1, F is set to 0 in step 125.
Then, in step 126, TM is cleared to zero, and the process returns to step 108. During this time, the stirring blade 5
rotates about 60 degrees due to inertial rotation, and register P is added to 8. Since F=0 in step 108, the process proceeds to step 130, where the motor 11 is driven to the left (reverse), and the stirring blade 5 rotates to the left. Since P≧1, the process advances to step 118. At this point, the register P is cleared to zero, and in step 119, a pulse signal from the rotation detector 8 generated by the rotation of the stirring blade 5 is newly added to the register P. Then, in step 120, it is determined whether the energization rotation angle has reached 210 degrees, that is, it is determined that P≧7, and if P<7, the process proceeds to step 140. At step 140, the pulse signal is generated at a period of about 30 ms, so step 11
Returns to 9, left-hand driving continues and pulses are counted. When the number of pulses becomes P≧7, step 12
1, the power supply to the motor 11 is cut off, and from this point on, the stirring blade 5 enters inertial operation, and in the stop determination section of step 115, the pulse signal from the rotation angle detector 8 disappears, so that the stirring blade 5 almost stops. Confirm that you have done so, and proceed to step 123. During this time, the stirring blade 5 rotates approximately 90 degrees due to inertial rotation. Step 12
Since F=0 in Step 3, the register F is set to 1, that is, the motor 11 rotates clockwise, and from then on, step 12
6. Next, proceed to step 108. Then, the motor 11 is driven to the right, and the stirring blade 5 starts to reverse to the left. Hereinafter, as long as the rotation detector 8 is normal, the stirring blade 5 has an energization rotation angle of about 210 degrees and an inertial rotation angle of about 90 degrees, which is 300 degrees.
It performs a reciprocating rotational movement clockwise and counterclockwise at a rotation angle of around 100 degrees, and washes the laundry while shaking and stirring it in the detergent solution.

On the other hand, if the detection signal from the rotation angle detector 8 is no longer generated, the motor 11 is
Rotation angle detector 8
It is determined that the motor 11 has failed, and the register P is cleared to zero in step 141, and the process proceeds to step 114, where power to the motor 11 is cut off.
5. Proceed to step 116, then step 1
Since P=0 at 09, the motor 11 is operated in a timed mode for 300 ms and stopped for 500 ms, alternately rotating clockwise and counterclockwise, and the stirring blade 5 has an energized rotation angle of about 150 degrees and an inertial rotation angle of about 60 degrees. It rotates reciprocatingly at a rotation angle of about 210 degrees, shaking and stirring the laundry in the detergent solution to wash it.

Incidentally, if the rotation angle detector 8 is already not activated at the start of washing, since P=0 in step 109, the motor 11 is operated in the timed mode from the beginning.

Since the device of this embodiment operates as described above, when the rotation angle detector 8 operates normally, the greater the amount of laundry, the greater the resistance applied to the stirring blades 5. The rotation angle becomes smaller, and the time until the stirring blade 5 almost stops becomes shorter, and the rotation angle of the stirring blade 5 including the inertial rotation angle becomes smaller, but the reciprocation period becomes shorter and the number of reciprocations per unit time becomes shorter. increases. Conversely, when the amount of laundry is small, the resistance applied to the stirring blades 5 is small, so the rotation angle due to inertial rotation becomes large, the time period until the stirring blades 5 almost stops becomes longer, and the reciprocating cycle becomes longer.

That is, the reciprocating rotation angle of the stirring blade 5 changes automatically according to the amount of laundry, and the reciprocating period also changes, so the number of reciprocations increases as the amount of laundry increases.
Cleaning efficiency increases.

Also, whether or not the rotation angle detector 8 operates normally is determined by driving the motor 11 in a timed mode at the start of washing, and if an abnormality occurs, the stirring blade 5 is rotated back and forth in a timed mode. In addition to the movement, even if the rotation angle detector 8 becomes abnormal during operation, the mode is automatically switched to a predetermined time limit mode, and there is no danger of the stirring blade 5 continuing to rotate in the rotation direction. Safe stirring blade 5
can perform reciprocating rotational movements.

In this example, the rotation angle of the stirring blade 5 is determined by directly detecting the rotational state of the stirring blade 5.
The present invention is not limited to this, and similar effects can be obtained even if the motor is controlled by, for example, detecting the rotational state of the motor and indirectly obtaining the rotation of the stirring blade.

Furthermore, the rotation angle detector 8 in this embodiment
Although the configuration is mainly composed of a light emitting element and a light receiving element, it is needless to say that the configuration is not limited to this.

In addition, the energization rotation angle of the stirring blade is not limited to the above example, and may be appropriately designed according to the specifications of the washing machine so that the rotation angle of the stirring blade, including the rotation angle due to inertial rotation, reaches a predetermined value. It goes without saying that the energization time and stop time must be set with consideration given so as not to put strain on the motor or speed reduction mechanism even when the load is small.

Furthermore, since the first energization time immediately after the start of washing is focused on determining whether or not the detection signal from the rotation angle detector is normally generated, the first energization time is set as in the above embodiment. It is not set to 300ms, which is the same as the time limit for the second energization,
For example, since the function can be achieved even with a short time period such as 200ms or 150ms, a short time period may be set. In this way, by energizing the motor for a short time in advance, there is an effect of improving familiarity of the deceleration mechanism, for example, by loosening the binding between the pulley and the belt.

Effects of the Invention As explained above, the present invention includes a rotation angle detection means for detecting the rotation angle of a stirring blade, and a control means for controlling a motor based on a signal from the detection means. The stirring blade is rotated reciprocatingly at a predetermined rotation angle, and the motor is rotated in the reverse direction after the stirring blade almost stops after power is cut off. The motor is determined whether or not it is occurring normally, and then the motor is controlled based on the detection signal, and from the point when the rotation angle detection means no longer operates normally, the motor is controlled in the forward and reverse directions in a timed mode. Since the rotation is controlled, the reciprocating rotation angle and the number of reciprocations of the agitating blades are automatically changed according to the amount of laundry, without putting strain on the motor or speed reduction mechanism, and the water flow is adjusted to the appropriate amount according to the amount of laundry. Not only does this automatically generate cleaning performance, but it also constantly monitors whether the rotation angle detection means is operating normally to ensure that the stirring blades are in the specified mode even if an abnormality occurs. Since it can rotate back and forth and fully perform the function of a washing machine, it can perform high-performance washing and has the effect of significantly increasing safety.

[Brief explanation of drawings]

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 tub, 5... Stirring blade, 6 Pulley, 7...
...Detection hole, 8... Rotation angle detector, 9... Light emitting section, 10... Light receiving section, 11... Washing drive motor, 14... Control circuit.

Claims (1)

[Scope of Claims] 1. In an agitating washing machine that performs washing by alternately rotating a stirring blade in a washing tub in forward and reverse directions by driving a washing drive motor in forward and reverse directions, the rotation angle of the stirring blade is detected. a rotation angle detection means; and a stirring blade is rotated by energizing the drive motor for a predetermined time based on a detection signal from the rotation angle detection means, and when the stirring blade has rotated by a predetermined rotation angle, the drive motor is activated. Cut off the electricity to the for a predetermined time,
After the predetermined period of time has elapsed, the drive motor is energized for a predetermined period of time so that the stirring blade rotates in reverse, and the rotational direction of the stirring blade is switched and controlled at predetermined time intervals, while the detection signal from the rotation angle detection means is A stirring type washing machine characterized by comprising: a control means for controlling the forward/reverse rotation of the stirring blade by switching and controlling energization and de-energization to the drive motor at predetermined time intervals when the driving motor is not running.