JPH0197497A - Washer - Google Patents

Abstract

PURPOSE: To control the rotation number per unit time of a rotary basket corresponding to a washing course or the like and to perform dehydration corresponding to contents by comparing the signals of a detector for detecting an actual rotation speed with the signals of a setting device and controlling the rotation speed of the rotary basket at the time of the dehydration to a speed set beforehand by the setting device. CONSTITUTION: At the time of controlling the rotation number per unit time of the rotary basket in a dehydration process, the deviation value m to a reference rotation number per unit time n of the upper limit and lower limit of the rotation number per unit time of the rotary basket is set and the values are stored in a memory 15. In the meantime, the actual rotation number per unit time of the rotary basket is detected in a rotation detection switch 8 and inputted through a flip-flop conversion element 26 and an input buffer control circuit 16 to an arithmetic processing CPU 13. The values of n and m obtained from the memory 15 and the reported actual rotation number per unit time of the rotary basket are compared, a motor 4 is turned off when the rotation number per unit time of the rotary basket is equal to or more than n+m rotation, the motor is turned on when it is equal to or less than n-m and thus the rotation number per unit time of the rotary basket at the time of the dehydration is ON/OFF controlled. For instance, in a 'saving course', the reference rotation number per unit time is high and the efficient dehydration is performed in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a washing machine in which the number of revolutions of a rotary tub during a dewatering process of the washing machine is variable and automatically controlled.

[Prior Art] A washing machine that automatically moves the washing process sequentially through a washing process, a draining process, a rinsing process, and a dehydrating process,
From the washing process to the rinsing process, a washing machine is known that detects the number of rotations of the rotating tub of the washing machine and changes the washing course in several ways, with the aim of saving washing water and shortening the washing time.

[Problems to be solved by the invention] However, in the dehydration process of conventional washing machines of this type, the rotation speed of the rotating tub is constant for any washing course;
That is, the rotation speed of the rotating tank was not selected or detected and controlled, but only the dewatering time was controlled. For this reason, depending on the type of laundry, the laundry may be squeezed too much or not enough, and the fabric of the laundry may be damaged.

This invention was made in order to solve the above-mentioned problems, and an object of the present invention is to provide a washing machine that can control the number of revolutions of the rotary tub in accordance with the washing course during the dehydration process, and can perform dehydration according to the contents. This is the purpose.

[Means for Solving the Problems] The washing machine of the present invention includes a setting device for setting the rotational speed of the rotating tub during spin-drying, a detector for detecting the actual rotational speed of the rotating tub during the spin-drying process, and a signal from the setting device. and a control circuit that compares the signal of the rotary tank with the signal of the detector and controls the rotational speed of the rotary tank during dehydration to a speed preset by the setting device.

[Example] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the main structure of a washing machine to which the present invention is applied.

l is connected to the outer tub of the washing machine (not shown) by a plurality of support rods 2.
It is a water tank supported by a water tank, and has a rotating tank 3 for dewatering which is independent of the water tank 1 inside.

A motor 4 is provided on the outer surface of the bottom of the water tank l and drives the rotating tank 3. This motor 4 drives the rotating tank 3 via a belt transmission mechanism 5 and a pulley 6 provided on the rotating shaft 3a of the rotating tank 3. Rotate. In addition, a magnet 7 is installed on the disc surface 6a of the pulley 6 at an appropriate distance from the center, and a reed switch is used to detect the rotation speed of the rotating tank 3 using the magnet 7. The rotation detection switch 8 is
It is provided at one point on the locus of the magnet 7 via a suitably fixed bracket 41 so as to face the magnet 7 and not be in contact with it.

FIG. 2 shows a block diagram of a control section for automatically moving the washing machine from the washing process to the final spin-drying process.

The control circuit 9 includes an electronic timer 12, an arithmetic processing unit (CPU
) 13, a clock control circuit 14, a memory 15 storing control sequences of various washing processes, an input buffer control circuit 16, and an output buffer control circuit 17.

The external input unit 10 includes a power switch 18 that supplies power to the entire device, a lid switch 19 that is turned on by detecting the closed state of a lid (not shown) that freely closes the rotary tank 3, and It has a water level switch 20 that turns on when it detects that the appropriate amount of washing water has been injected into the washing machine, a program switch 2I for selecting a combination of washing processes, and a rotation detection switch 8. The off state is converted into logical values "0" and "bi" by conversion elements 22 to 26 such as flip-flops attached to each switch, and is input to the input buffer control circuit 16.

The external output unit 11 includes a drain valve 27 that opens and closes when washing water is stored in the rotating tub 3 or drains it, a water supply valve 28 that opens and closes when washing water is supplied to the rotating tub 3, a motor 4, and a signal indicating the end of washing. It has an annunciator 29, and these components 27 and 28
, 4.29 is the output buffer control circuit 1
The energization is controlled by the signal outputted from 7 through the switching elements 30 to 33 such as Cyrisk attached to each part.

In the above configuration, the arithmetic processing unit (CPU) 13
By reading signals from the input buffer control circuit 16 and control signals indicating the washing process designated by the program switch 21 from the memory 15, washing, water supply, rinsing, spin-drying, etc. are carried out in the same manner as in known washing machines of this type. The output buffer control circuit 17 determines the notification process and outputs the signals necessary to carry out the process.
Output to. In addition, the transition of these steps is controlled by the electronic timer 12.
controlled by

With the above configuration, the washing process automatically moves sequentially under the control of the electronic timer 12, and when the dehydration process begins,
The arithmetic processing unit (CPU) +3 sends a signal to the output buffer control circuit 17, and upon receiving the signal, the output buffer control circuit 17 operates the motor 4 and the rotating tank 3 starts rotating. The rotation speed of the rotating tank 3 is controlled by turning the motor 4 on and off, and the rotation speed (n: reference rotation speed), which is the standard for controlling the rotation speed of the rotating tank 3, is controlled for each course selected by the user using the program switch 21. It is set. Furthermore, when controlling the rotation speed of the rotating tank 3, deviation values (referred to as m) of the upper and lower limits of the rotation speed of the rotating tank 3 with respect to the reference rotation speed n are also set, and these n The values of and m are stored in the memory 15. On the other hand, the actual rotation speed of the rotating tank 3 is detected by the rotation detection switch 8 and inputted to the arithmetic processing unit (CPU) 13 via the flip-flop conversion element 26 and the input buffer control circuit 16. Arithmetic processing unit (CP)
U) 13 compares the values of n and m obtained from the memory 15 with the reported actual rotation speed of the rotating tank 3, and turns off the motor 4 if the rotation speed of the rotating tank 3 is n+m rotations or more. , nm rotations or less, the motor is turned on to control the rotation speed of the rotating tank 3 during dehydration.

As mentioned above, by setting the reference rotation speed of the rotation tank 3 for each selected course, the rotation speed of the rotation tank 3 during dehydration changes, so for example, the "saving course"
In this case, the reference rotation speed is high, and dehydration can be performed efficiently in a short time. Furthermore, when washing knitted fabrics, for example, by lowering the standard rotational speed during spin-drying, it is possible to spin-dry without damaging the fabric of the laundry.

[Effects of the Invention] According to the present invention, the rotation speed of the rotary tank during dehydration can be selected and set at will according to the washing course, the fabric of the laundry, etc., and the washing and fabric of the laundry are time- and economically efficient. It is possible to provide a washing machine that does not damage etc.

[Brief explanation of the drawing]

5. FIG. 1 is a sectional view showing the main parts of a washing machine to which the present invention is applied, and FIG. 2 is a block diagram of a control circuit that controls the washing machine shown in FIG. l...water tank, 2...support rod, 3...rotating tank, 4
...Motor, 5.Belt transmission mechanism, 6.Pulley, 7.Magnet, 8.Rotation detection switch, 9.Control circuit, lO
...external input section, 11..external output section, 12.electronic timer, 13.. arithmetic processing unit (CPU),
14... Clock control circuit, 15... Memory,
16...input buffer control circuit,
17... Output buffer control circuit,
18. Power switch, 19. Lid switch,
20 water level switch, 21...program switch,
22-26 ・Conversion element, 27 ・Drain valve, 2
8 ・Water supply valve, 29...Alarm, 30-33...
・Switching element. Patent applicant Sharp Co., Ltd. agent Patent attorney Aohaku Ao and 2 others - 8=

Claims (1)

[Claims] (1) A setting device that sets the rotational speed of the rotating tank during dewatering, a detector that detects the actual rotational speed of the rotating tank during the dehydration process, and a signal from the setting device and a signal from the detector are compared during dehydration. A washing machine comprising: a control circuit for controlling the rotational speed of the rotating tub to a speed preset by the setting device.