JPS6337680B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dehydration control device for a washer dehydrator. In conventional washing and dehydrating machines, the user sets the dehydration time using a time switch, and in automatic washing machines, the dehydration operation is performed according to a preset program of dehydration time. However, setting the spin-drying time using this conventional method is only a rough estimate, and the spin-drying time that is appropriate for the quantity and quality of the laundry cannot be obtained, causing wrinkles in the fabric due to squeezing too much, or re-spinning due to insufficient squeezing. There are times when you have to. In view of this point, it is an object of the present invention to provide a dehydration control device that automatically sets a dehydration time suitable for the quantity and quality of laundry.

Embodiments of the present invention will be described with reference to the drawings. 1st
The figure shows the overall configuration of a control device for an automatic washing machine equipped with a dewatering control device of the present invention. In the figure, numeral 1 denotes a program selection section, which is comprised of a selection switch for selecting a washing program. Reference numeral 2 denotes a status detection unit, which includes a water level switch that detects the water level in the washing tub, a lid switch that detects the open/closed state of the lid of the washing machine, and a safety switch that detects abnormal vibrations during spin-drying.
Reference numeral 3 denotes an operation control section, which is composed of a microcomputer that stores a plurality of preset washing programs and controls the load according to the program specified by an input signal. Reference numeral 4 denotes a load control unit which controls a load unit 5, which includes a drive motor, a water supply solenoid valve, a drain solenoid valve, etc., for performing a series of operations such as washing, rinsing, draining, and dewatering, etc., using signals from the operation control unit 3. A semiconductor switching circuit that directly controls the load section 8 and an operation control section 3.
and a drive circuit that converts the signal from the semiconductor switching circuit into the level of the control signal of the semiconductor switching circuit. Reference numeral 6 denotes an operation display drive circuit that controls an operation display section 7 that displays the process using a light emitting diode or the like based on a signal from the operation control section 3. 8 is a rotation detection unit that detects the rotation speed of the motor or dehydration tank;
Reference numeral 9 denotes a signal conversion section that converts the output of the rotation detection section 8 into an input signal to the operation control section 3.

FIG. 2 shows the relationship between the rotation speed of the motor or the dehydration tank and the dehydration time. When the amount of laundry is small,
Alternatively, when the laundry absorbs little water and is light, the load on the motor is small and the time T ₁ required for the rotation speed to reach the saturation rotation speed S is short. When there is a large amount of laundry,
Alternatively, when the laundry absorbs a large amount of water and is heavy (B), the load on the motor is large and the time T ₂ required for the rotation speed to reach the saturation rotation speed S is long. Therefore, by measuring the time it takes for the rotation speed of the motor or dehydration layer to reach a certain value, you can estimate the weight and moisture content of the laundry, and based on that time, determine the appropriate dehydration time for that laundry. can be determined. In Figure 2, the time t ₁ or t ₂ until A or B reaches the rotation speed N, which is approximately 70 to 80% of the saturation rotation speed S, is detected, and the constant K
The case where the time Kt ₁ or Kt ₂ multiplied by (2 to 4) is taken as the dehydration time of A or B is shown.

FIG. 3 shows a specific circuit example of the rotation detection section 8 and the signal conversion section 9. 10 is a detection metal piece attached to the motor or dehydration tank, and 11 is a proximity switch. When the motor or dehydration tank rotates once, a pulse voltage is generated at the output of the proximity switch 11, and the number of revolutions of the motor or dehydration tank is detected by the number of pulse voltages per unit time (pulse frequency). The signal converter 9 includes an f-V converter circuit 12 and a voltage comparator circuit 1.
3, the frequency output of the proximity switch 11 is converted into a voltage signal by the fV conversion circuit 12 and applied to the + terminal of the voltage comparison circuit 13. A reference voltage is applied to the - terminal of the voltage comparison circuit 13, and the input voltage applied to the + terminal is compared with this. Now, the rotation speed of the motor or dehydration tank is 70, which is the saturated rotation speed S of the motor, as shown in Figure 2 A and B.
When the output of the f-V conversion circuit 12 when the rotation speed N reaches approximately 80% acts on the voltage comparison circuit 13, the output of the voltage comparison circuit 13 is low level when the rotation speed is lower than N, and the rotation speed is low. By setting the voltage level to be high when the number is higher than N, the voltage level of the input terminal Ai of the operation control section 3 can be changed. On the other hand, the operation control unit 3 measures the time from the start of the dehydration operation until the voltage level of the input terminal Ai changes (t ₁ or t ₂ in FIG. 2), and adds a constant K (2 to 4) Calculate the multiplied time Kt ₁ or Kt ₂ and use this time as the dehydration time of A or B to control the load. In the above embodiment, the rotation speed in the rotation detection section 8 is detected by the detection metal piece 10 and the proximity switch 11, but other means include a magnet and a Hall IC.
Alternatively, there is a method using a reed switch or a method using a tachometer generator.

As described above, the present invention detects the time until the spin-drying tank into which the laundry is put reaches a predetermined rotation speed, and performs spin-drying control using the time multiplied by a certain constant as the spin-drying time of the laundry. This is a dehydration control device for a washer dehydrator, which is characterized by the ability to determine the dehydration time that is appropriate to the amount of laundry put into the dehydration tank and the amount of water absorbed, so that dehydration can be performed without over- or under-wringing. It has excellent effects.

[Brief explanation of drawings]

Fig. 1: A block diagram showing the overall configuration of the control device for the washer-extractor of the present invention, Fig. 2: A graph explaining the relationship between the rotation speed of the motor or the spin-drying tank and the spin-drying time, Fig. 3: The washing-extractor of the present invention FIG. 3 is a diagram showing a specific circuit of an embodiment of the dehydration control device. [Symbols] 1...Program selection section, 2...Status detection section, 3...Operation control section, 4...Load control circuit, 5...Load section, 6...Operation display drive circuit, 7...Operation Display section, 8... Rotation detection section, 9...
... Signal converter, 10 ... Detection metal piece, 11 ... Proximity switch, 12 ... f-V conversion circuit, 13 ...
Voltage comparison circuit.

Claims (1)

[Claims] 1. A washing machine characterized by detecting the time required for a spin-drying tank into which laundry is placed to reach a predetermined number of revolutions, and performing spin-drying control using the time multiplied by a certain constant as the spin-drying time for the laundry. Dehydration control device for dehydrator.