JPH03215289A - Drum type washing machine - Google Patents

Abstract

PURPOSE:To reduce the vibration and noise of a rotary drum by a method wherein the rotational frequency of a motor detected by a speed detector is compared with a set rotational frequency (reference rotational frequency) to judge a rotational unbalance at the start-up of dewatering process, and the high speed dewatering operation is restarted after the unbalanced loading of laundry is adjusted. CONSTITUTION:When dewatering process takes place after washing process is finished, a controller 18 outputs a high speed operation signal to a speed setting element. At this time, the rotational frequency of a motor 11 after a specified measuring time period has passed is input by a speed detector 16, and compared with a reference rotational frequency. When the actual rotational frequency is higher than the reference rotational frequency, dewatering is continued for a specified time period. However, the actual rotational frequency is lower than the reference rotational frequency, it is judged as a failure of dewatering start-up, then the motor 11 is stopped once, and a low speed rotation signal is input to the speed setting element. And, normal dewatering takes place again after loosening operation is carried out at a low rotational frequency of a rotary drum, so that normal high speed dewatering operation can be performed with less vibration.

Description

DETAILED DESCRIPTION OF THE INVENTION The field of application of the invention relates to a drum-type laundry machine that has the functions of detecting failure of the cycle drum during dewatering operation and correcting the problem.

2. Description of the Related Art Many skin-shaped drum-type washing machines that rotate around a horizontal axis have been proposed.

Furthermore, most of the washing machines used in Europe are this type of drum-type washing machine. This type of washing layer generally performs washing work by continuously rotating a rotating drum at low speed, but this rotating drum can also be used to easily perform dewatering and drying.

However, because the rotating drum rotates around a horizontal axis (1), especially during spin-driving operation, high-speed operation starts with the laundry concentrated at the bottom of the rotating drum due to gravity, resulting in an imbalance. Abnormal vibrations are likely to occur. For this reason, a method has been proposed in which abnormal vibration detection means is provided to control the rotation of the rotating drum. Special Public Service 1986-4
According to QQ94, a root movement detection sensor using a micro switch or the like is installed on the inner wall of the outer box, and when the outer 1 contacts the sensor, mechanical movement of the outer tank is detected, and the rotation of the rotating drum is detected. A method for detecting dehydration start-up failure and abnormal silk movement is described.

Problems to be solved by the invention However, in such conventional drum-type washing machines,
Abnormal vibrations due to spin-start failure of the rotating drum or unbalanced laundry are replaced with the vibration amplitude of the outer thin layer, and its displacement is detected in a reduced manner. It was necessary to improve reliability to the extent that it could withstand many years of use. Also,
There are many difficulties in setting the displacement of the ejection part that is determined to be abnormal.
For example, if it is set to be able to detect even relatively small displacements, the main body of the detection unit may be damaged if the outer door undergoes large abnormal vibrations, so it is not necessarily reliable for long-term use.

The present invention solves the above-mentioned problems and aims to provide a drum-type laundry bin having highly reliable detection means.

Means for Solving the Problems In order to achieve the above object, the present invention is equipped with a speed detection means for the motor that drives the rotating drum and a control means for controlling the entire rotation of the motor based on the signal from the speed detection means for the motor that drives the rotating drum. The rotational speed of the rotary drum due to the load is influenced by the rotational speed of the motor, and the dewatering operation is controlled by both means.

The present invention has the above configuration. When driving with pleasure,
The rotary drum is rotated at high speed, and the speed of the motor is read by the speed detection means when a predetermined time has elapsed since the start. If the signal is less than a predetermined value (judgment number), the control means determines that there is a dehydration failure and performs control. According to instructions from the means, the motor is rotated at a low speed, and after loosening the clumps of laundry in the rotating drum, the motor is rotated at a high speed again.

EXAMPLE Hereinafter, an example of the present invention will be described based on the accompanying drawings.

As shown in FIG. 1, outside f! 1 has no horizontal drum shape, and a circular opening 2 is formed on one side for loading and unloading all the laundry. In addition, this outside FfJ1 is support L,
It is supported by the outer box 4 by $3.

A slot 6 is provided at a portion of the outer box 4 corresponding to the opening 2 of the outer box 4, and this opening 2. The inlet 6 is shaped so that it can be opened and closed by a detachable door 6, and the opening 2 and the inlet 6 are sealed by a puff king 7. Inside the outer tank 1,
Outside +′! A rotating drum 8 having a substantially similar shape to 1 is housed therein. A large number of small holes 9 are provided in the peripheral wall of the rotating drum 8.
The washing liquid in the outer tub 1 can freely go in and out.

An opening for loading and unloading the laundry is formed on one side of the rotating drum 8, and a rotating shaft 10 is fixed to one side of the pond, and the end of the rotating shaft 10 is connected to the outside #vI1. It rotatably passes through a bearing fixed to the side surface, and is transmitted to the rotating shaft 1o by the power of a motor 11 fixed to the outer tank 1 via a groove 12. A drain pipe 13 is provided at the bottom of the outer tub 1 and communicates with the outer tub 1, and the entire washing liquid in the outer tub 1 is discharged to the outside of the machine via a valve 14 and a drain hose 16.

Further, a speed increasing means 16 including a tachogenerator or the like is connected to the motor 11 and electrically connected to a control means 18 housed in an operation panel 17.

Note that the closed-loop system speed of the rotational speed of the motor 11 in the control means 18 in FIG. Regarding the II m section, the rotation speed of the motor 11 is converted into a voltage proportional to the rotation speed by the speed detection means 16, and compared with the voltage set by the speed setting section. By driving the motor 11 with input from the increaser and the drive circuit and controlling the error voltage to 0, the number of rotations of the motor 11 can be maintained at the value set by the speed setting section.

In the above configuration, the operation in the case where a dehydration start failure occurs due to abnormal vibrations or unbalanced laundry during the pleasure operation by the control means 18 will be described with reference to FIGS. 3 and 4.

When the washing process is completed and the washing liquid in the outer tub 1 has been discharged, the dewatering process (FIG. 3 1L) is started. ) is input, and the motor 11 is started (C). At this time, the speed detection means 16 inputs the rotation speed of the motor 11 after a predetermined measurement time as a signal (d), and compares it with the identified rotation speed (θ), and determines the actual rotation speed from the determined rotation speed. If is high, it is determined that the rotational speed of the rotating drum 8 is increasing normally without any abnormal vibrations (f), and the dewatering operation is continued for a predetermined time (▲).

However, if the actual rotational speed is lower than the determined rotational speed (Fig. 3g), as shown by the chain chain in Fig. 4, it is determined that the dehydration start has failed, and the drive of the motor 11 is temporarily interrupted. (h), the low speed transmission (i) is input to the speed setting section, and the motor 11 is started (B).

At this time, the number of rotations? If the centrifugal force on the circumferential surface of the rotating drum 8 is set to be, for example, 1 G (here, G is gravitational acceleration), the rotation radius of the laundry that was unevenly concentrated in the rotating drum 8 will be smaller than the circumferential surface. Since it is small, it falls near the highest point of the rotating drum 8 against the lifting action of the rotating drum 8 during rotation. And this rotating drum 8
By performing the low-speed loosening rotation and then shifting to the normal dehydration process again, normal high-speed dehydration operation with less vibration can be performed.

The rotation speed at which it is determined that spin-starting has failed is determined by taking into consideration that if there is less laundry, the load on the motor 11 will be smaller and the startup will be faster. It is easy to perform a test at the lowest voltage variation, statistically process the experimental results, and set the value. Therefore, the rotational unbalance at the start of dewatering, which causes abnormal vibrations and noises that occur during the above-mentioned dewatering operation, can be easily determined from the behavior of the rotational speed of the motor 11.

Effects of the Invention As is clear from the above embodiments, according to the present invention, the motor is controlled by comparing the rotation speed detected by the motor speed detection means with a predetermined rotation speed (judgment rotation speed). By being equipped with a control means, the rotation unbalance at the start of spin-drying is determined from the behavior of the rotational speed of the motor, and after moving to the process of correcting the unbalance of the laundry, the high-speed water operation is performed again. Because we are
There is no impact shock from the rotating drum as in the conventional system, and vibration and noise during dewatering can be reduced. Further, since the above-mentioned electric control means is used, a highly reliable drum-type washing machine can be provided.

[Brief Explanation of the Drawings] Figure 1 shows the longitudinal direction of a drum-type washer according to an embodiment of the present invention.
Fig. 2 is a flowchart of the control method for the motor, Fig. 3 is a flowchart of the dehydration process, and Fig. 4 is a relational diagram showing an example of determining whether the dehydration process is defective. 1...1.Forecasting, 8..Rotating drum, 11.
...Motor, 16...speed, sentence detection means, 1B.
...-control means. Name of one person: Bensanshi Shigetaka Awano and one other person Figure 2! Foreign rights Figure 3 (A) (B,' Figure 4 Normal

Claims (1)

[Claims] An outer tank having a water storage function, a rotating drum that freely rotates around a horizontal axis passing through a side wall of the outer tank and that stores laundry therein, and a motor that drives the rotating drum. The control means includes a motor speed detection means and a control means for controlling the motor according to a signal from the speed detection means, and the control means rotates the rotary drum at high speed during dewatering operation, and the speed detection means controls the speed detection means after a predetermined period of time from the start. If the signal from the drum is below a predetermined value, it is determined that the spin-drying rotation is defective, the power supply to the motor is temporarily stopped, the motor rotates at a low speed to balance the laundry, and then the high-speed spin-drying operation is performed again.