JP2013223621A - Drum type washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drum type washing machine capable of detecting eccentricity of laundry with accuracy without being influenced by balls.SOLUTION: A drum type washing machine includes: a bottomed cylindrical drum 3 which is supported rotatably by a rotation shaft 31 that is horizontal or inclined; a water tank 2 which accommodates the drum 3; a drive motor 4 which drives the drum 3; an annular container 17 which is provided integrally with the drum 3; a plurality of rolling elements 8 which are movably accommodated inside of the annular container 17; eccentricity detection means 20 which detects an eccentricity state of the drum 3 that is generated by imbalanced laundry in the drum 3 or the rolling elements 8 at the time of the rotation of the drum 3; and control means 6a which analyzes an eccentricity position that is detected by the eccentricity detection means 20, and controls the drive motor 4. The control means 6a detects the eccentricity state of the drum 3 by the eccentricity detection means 20 in a state where the drum 3 rotates at the rotation speed at which the laundry in the drum 3 does not fall, and the rolling elements 8 stay at the lower part of the drum 3.

Description

  The present invention relates to a drum-type washing machine that includes a drum that is rotatable while accommodating laundry in an elastically supported water tub, and performs washing, rinsing, and dewatering of the laundry in the drum.

  In general, in a dewatering process of a drum-type washing machine having a horizontal or inclined rotating shaft, the laundry is often in a non-uniform state, that is, an unbalanced state in the drum. As a result, a biased force is applied to the rotating shaft during dehydration, and vibration is generated. The amplitude of vibration increases in proportion to the square of the rotational speed of the rotating drum. Due to the vibration, the washing machine itself moves, and there are problems such that it becomes impossible to drive at a rotational speed higher than a certain speed because of the intense noise.

  There is a ball balancer system using metal balls (hereinafter referred to as balls) in order to reduce vibration due to unbalance of the laundry. The ball balancer includes a plurality of balls having a degree of freedom in the rotational direction (circumferential direction) in an annular container portion attached to the inner periphery of the drum. The ball balancer is a balance device that utilizes a dynamic phenomenon in which a ball automatically moves to an opposing position with respect to an unbalanced body that generates an eccentric load.

  In addition to a single ball balancer in which balls are arranged on the front side of the drum, a double ball balancer in which a plurality of balls are arranged at two locations on the front side and bottom side of the drum is also known (for example, Patent Document 1). reference). FIG. 7 is a diagram showing a conventional drum-type washing machine. A ball balancer 71 is provided at the opening and bottom surface of the drum 7, and a ball 72 is movably contained in each of them. These are in principle the same as single ball balancers. That is, both ball balancers have a mechanism in which a plurality of balls change their positions and automatically correct the imbalance in response to the unbalance amount of the laundry that changes over time in the dehydration process.

  In Patent Document 1, the first rotation speed is rotated at a rotation speed equal to or lower than the resonance rotation speed, and the ball moves to the in-phase position with respect to the eccentric load for a predetermined time and is maintained at the in-phase position. After that, the drum gradually accelerates from the stopped state at the in-phase position and passes through the resonance rotational speed. Thereby, the ball is automatically moved to the unbalanced opposing position by the principle of automatic balancing, thereby suppressing the vibration.

  In addition, after increasing the drum rotation to the upper limit of the transient vibration rotation speed region near the high speed side of the resonance rotation speed, the rotation speed of the drum is rotated discontinuously in order to move the ball in a direction to cancel the unbalance. The drum is controlled by slightly changing the speed (see, for example, Patent Document 2).

JP 2010-125083 A JP2011-125401A

However, in the conventional configuration, when the rotational speed of the drum is lower than the resonant rotational speed, the ball is in the same phase as the unbalance. For this reason, since the ball works as an unbalance, the vibration may increase when passing through the resonance rotational speed. In addition, when detecting the amount of eccentricity and the position of the laundry in the drum, the ball also rotates simultaneously with the drum, so it is difficult to accurately detect the eccentric state. Therefore, depending on the eccentric state, such as the amount of eccentricity of the laundry being small, the ball has a problem of causing unbalance.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object thereof is to provide a drum-type washing machine that accurately detects the amount of eccentricity of laundry without being affected by a ball.

In order to solve the conventional problems, the drum type washing machine of the present invention is:
A bottomed cylindrical drum rotatably supported on a horizontal or inclined rotating shaft;
A water tank containing the drum;
A drive motor for driving the drum;
An annular container provided integrally with the drum;
A plurality of rolling elements movably accommodated in the annular container;
Eccentricity detecting means for detecting the eccentricity of the laundry in the drum and the eccentric state of the drum caused by the rolling elements when the drum rotates.
A control means for analyzing the eccentric position detected by the eccentricity detection means and controlling the drive motor;
The control means includes
The eccentricity detecting means detects the eccentric state of the drum in a state where the laundry in the drum does not fall and the drum is rotated at a rotational speed at which the rolling element stays in the lower part of the drum. It is a feature.

  Thereby, the imbalance in the drum can be accurately detected without being affected by the rolling elements.

  Since the drum type washing machine of the present invention can raise the drum so that the ball can obtain a vibration suppressing effect against unbalance, the drum vibration at the resonance rotational speed can be suppressed to a minimum.

Sectional drawing of the principal part of the drum type washing machine in Embodiment 1 of this invention Schematic of the ball balancer according to Embodiment 1 of the present invention Control block diagram of drum-type washing machine in Embodiment 1 of the present invention The figure showing the sequence of the rotational speed in Embodiment 1 of this invention Drive motor current characteristic diagram in Embodiment 1 of the present invention Drive motor current characteristic diagram in Embodiment 1 of the present invention The figure which shows the conventional drum type washing machine

A drum-type washing machine according to a first aspect of the present invention is a bottomed cylindrical drum that is rotatably supported by a horizontal or inclined rotating shaft, a water tank that houses the drum, a drive motor that drives the drum, Annular container provided integrally with the drum, a plurality of rolling elements movably accommodated inside the annular container, and a bias of laundry in the drum and the rolling elements when the drum rotates. An eccentricity detecting means for detecting an eccentric state of the drum, and a control means for analyzing the eccentric position detected by the eccentricity detecting means and controlling the drive motor, wherein the control means is for the laundry in the drum. The eccentricity detecting means detects the eccentric state of the drum in a state where the drum is rotated at a rotational speed at which the rolling element stays below the drum without falling. .

  With this configuration, it is possible to create a state in which the laundry sticks to the drum but the rolling element does not rotate with the drum and is stopped at the lower part of the drum, and the unbalance position of only the laundry can be detected with high accuracy. For this reason, it becomes easy to control the drum according to the unbalanced state of the laundry, and noise and vibration when the drum is rotated at high speed can be suppressed.

  In a second aspect of the invention, the eccentricity detecting means of the drum type washing machine of the first aspect of the invention detects the eccentric position of the drum, and the control means detects the eccentric state of the drum by the eccentricity detecting means. The drive motor is controlled so that the drum is accelerated and the eccentric position of the drum is opposed to the rolling element when the rotational speed of the drum passes the resonant rotational speed.

  With this configuration, it is possible to create a state in which the laundry is stuck to the drum but the rolling element is not rotated with the drum and is stopped at the lower portion of the drum, and the unbalance position of only the laundry can be detected. Then, based on the positional relationship between the rolling elements and the unbalance at the start of drum acceleration, the driving motor is controlled during the drum acceleration, and the unbalanced and rolling elements are in a relative positional relationship facing each other when the resonance rotational speed is passed. Therefore, the vibration of the drum when the resonance rotational speed passes can be minimized.

  In a third aspect of the invention, the eccentricity detecting means of the drum type washing machine of the first or second aspect of the invention detects the amount of eccentricity of the drum, and the control means detects the amount of the drum during the acceleration operation of the drum. When it is detected that the amount of eccentricity is greater than a predetermined threshold, the drive motor is controlled so that the amount of eccentricity of the drum is smaller than the predetermined threshold.

  With this configuration, since the amount of eccentricity of the drum can be detected while accelerating the drum, even if the rolling element spreads or the unbalance amount changes due to changes in the state of the laundry, the drum rotation is controlled accordingly. It can control so that a rolling element and an unbalance will be in an opposing position. For this reason, the vibration of the drum can always be minimized.

  According to a fourth aspect of the present invention, the control means of the drum type washing machine according to any one of the first to third aspects of the invention is characterized in that the resonance depends on an eccentric position of the drum before the drum acceleration and a position of the rolling element. The acceleration of the drum up to the rotational speed is determined, and when the rotational speed of the drum passes the resonant rotational speed, the drive motor is set so that the rolling elements and the unbalance of the laundry are in opposite positions. It is something to control.

  With this configuration, the control of bringing the unbalanced laundry and the rolling elements to the opposite positions during acceleration of the drum can be performed quickly and accurately. Can be minimized over a wide range.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this plan is not limited by this embodiment.

(Embodiment 1)
FIG. 1 is a cross-sectional view of a main part of a drum type washing machine in Embodiment 1 of the present invention. FIG. 2 is a schematic diagram of the ball balancer according to the first embodiment of the present invention.

Inside the drum type washing machine 1, a bottomed cylindrical water tank 2 is accommodated. A bottomed cylindrical drum 3 is accommodated in the water tank 2. On the front side of the drum-type washing machine 1, an opening 3 a that communicates with the drum 3 through the opening 2 a of the water tank 2 is provided. The drum 3 is disposed such that a rotating shaft 31 that rotatably supports the drum 3 is inclined downward from the front side toward the back side. The water tank 2 is inclined and arranged along the drum 3 with the opening 2a as the front side. By inclining the rotation shaft 31, the opening on the front side of the water tub 2 can be arranged on the upper side, and the laundry 13 in the drum 3 can be taken out without taking a posture of bending greatly. Moreover, compared with the case where the rotating shaft 31 is set in the horizontal direction, the water supplied into the water tank 2 is accumulated on the back side, and a deep water storage state can be obtained even with a small amount of water. That is, even with a small amount of water supply, the water 13 can be easily hydrated. The water tank 2 is supported by a spring 10 and a damper 5. In addition, if the ease of taking out the laundry 13 and the amount of water supply are not considered, the rotating shaft 31 may be horizontal.

  A baffle 16 that lifts and drops the laundry 13 as the drum 3 rotates is provided inside the drum 3. When the drum 3 is driven to rotate, the laundry 13 lifted by the baffle 16 is struck against the water surface from the top of the drum 3 and is washed by tapping (mechanical force). Further, the drum 3 is provided with a plurality of through holes 15. Water can be passed from the water tank 2 into the drum 3 through the through holes 15.

  Moreover, the door 7 is provided in the opening part 3a so that opening and closing is possible. The opening 2a of the water tank 2 is provided with an annular sealing material at the mouth edge. The front side of the sealing material is in contact with the back side of the door 7 and sealed, and even if the opening 2a of the water tank 2 that swings up and down, right and left and back and forth moves, the sealing material is deformed and pressed against the back side of the door 7 Sex is maintained.

  A ball balancer (balancing means) 30 is provided in the opening 3 a on the front side of the drum 3. The ball balancer 30 includes an annular container 17 disposed on the front side of the drum 3, a ball 8 (rolling element) made of metal that can move within the annular container 17, and a viscous fluid 18 that is stored in the annular container 17. And a gas layer 33 (air). The ring-shaped annular container 17 is installed so as to be concentric with the drum 3. That is, the rotation axis of the annular container 17 coincides with the rotation axis 31. In order to control the movement of the ball 8, a viscous fluid 18 is stored inside the annular container 17. In the first embodiment, silicon oil is used. In addition, even if it is machine oil and other viscous liquids, since the same effect is acquired, it is not limited to silicone oil.

  A drive motor 4 for rotationally driving the drum 3 is attached to the inside of the drum type washing machine 1 and below the water tub 2. The rotational drive of the drive motor 4 is transmitted via a belt 23 to a drum pulley 24 provided on the same shaft of the drum 3. As a result, the drive motor 4 drives the drum 3 to rotate. In this embodiment, the belt driving motor is described. However, a direct motor system that directly drives the drum may be used.

  A water supply valve 11 is provided at the top of the drum type washing machine 1. Water from the water supply valve 11 flows into the detergent case 9 and is supplied into the water tank 2 while dissolving the detergent. In the rinsing process, since there is no detergent in the detergent case 9 even through the detergent case 9, rinsing water containing no detergent component is supplied. In addition, a drain pump 19 is provided at the lower part of the drum type washing machine 1, and by driving the drain pump 19, washing water and rinsing water in the water tank 2 are drained. In the present embodiment, the drainage pump 19 drains the washing water and the rinsing water in the water tank 2, but it may be a drain valve.

Next, details of the control means 6a for controlling the drive motor 4 and the like, and controlling the steps such as washing, rinsing and dehydration will be described with reference to FIG. FIG. 3 is a control block diagram of the drum type washing machine in the first embodiment of the present invention. The control device 6 includes a control unit 6a, an eccentricity detection unit 20, and a current detection unit 22. The control means 6a is a system that can manage all input / output control with a timer including various sensor outputs such as vibration detection means 12 and water level sensor 21 as well as instructions for driving the water supply valve 11, drainage pump 19 and drive motor 4. It is possible to know the time required for each operation and timing.

  The control means 6a is an electric circuit having a CPU, a memory, a driver circuit, and the like as a hardware configuration, and moves peripheral devices such as the drive motor 4 in accordance with a program stored in the memory in the control means 6a.

  The current detection means 22 detects the value and phase of the current applied to the drive motor 4 and outputs a signal to the eccentricity detection means 20. The eccentricity detection means 20 functions as an eccentric position detection means for detecting the eccentric position of the drum 3 caused by the deviation of the laundry or the ball 8 based on the signal of the current detection means. Further, the eccentricity detection means 20 also functions as an eccentricity detection means for detecting the eccentricity amount of the drum 3 by comparing the magnitude of the current applied to the drive motor 4. That is, the control means 6a can determine the eccentric amount and the eccentric position of the drum 3 based on the current value and phase detected by the eccentricity detecting means 20. The control means 6a determines the eccentric position and the eccentric amount due to the laundry 13 and the position of the ball 8, and issues a command to the drive motor 4 to start up the rotation of the drum 3.

  The vibration detecting means 12 for detecting the vibration of the water tank 2 is provided at the upper part on the back side of the water tank 2. The vibration detection means 12 detects vibration of the water tank 2 in a series of steps of washing, rinsing and dehydration. After the control means 6a analyzes the vibration value in each process, an optimal motor control is performed by issuing a command to the drive motor 4. The vibration detection means 12 includes at least one acceleration sensor, and detects vibration in at least one of the vertical direction, the horizontal direction, and the front-rear direction of the water tank 2. The acceleration sensor may be a semiconductor acceleration sensor, a piezoelectric acceleration sensor, or the like, and may be a uniaxial or biaxial acceleration sensor.

  The dehydrating operation of the drum type washing machine configured as described above will be described below with reference to FIGS. FIG. 4 is a diagram illustrating a rotation speed sequence of the drum-type washing machine according to the first embodiment of the present invention. 5 and 6 are characteristic diagrams of the drive motor current in Embodiment 1 of the present invention. Note that the dehydration operation does not mean only final dehydration in the dehydration step, but also includes intermediate dehydration performed after the washing step or after the first rinsing step.

  First, when the drum-type washing machine 1 performs dehydration after draining, a drive voltage is applied to the drive motor 4 according to a command from the control means 6a. The drive motor 4 is operated from low speed rotation to high speed rotation, and the rotation speed of the drum 3 is gradually increased. At this time, since the drive motor 4 is a permanent magnet synchronous motor, the rotor position of the drive motor 4 is detected. Thereby, it is possible to increase the rotational speed safely and at high speed by preventing the drive motor 4 from stepping out.

Next, the control means 6a rotates and maintains the drum 3 to a rotational speed at which the gravity applied to the laundry 13 or the ball 8 is smaller than the centrifugal force generated by the rotation of the drum 3 ((i) in FIG. 4). At this time, when the drum rotates, the laundry 13 sticks to the inner wall of the drum 3. The rotation speed at this time is slightly moved along the rotation direction of the drum 3 in such a manner that the ball 8 in the annular container 17 is dragged by the viscous fluid 18 in the annular container 17. It is set as the rotational speed which stays in the annular container 17 instead. In order to fasten the ball 8 in the annular container 17, the viscous fluid 18 having a self-weight determined by the density, diameter, and number of the balls 8, and an arbitrary viscosity and specific gravity at the drum rotation speed at which the laundry 13 sticks, 8 and the frictional force between the ball 8 and the annular container 17 and the frictional force between the ball 8 and the annular container 17 must be balanced. Further, since the influence of centrifugal force increases as the rotational speed of the drum 3 increases, the ball 8 rotates together with the drum 3. In this state, if the rotational imbalance of the drum 3 itself is minimized,
Only the eccentricity 13 a caused by the laundry stuck to the drum 3 becomes a fluctuation factor of the current of the drive motor 4.

  Therefore, in the state where the ball 8 is not rotating, only the laundry 13 is rotating. Therefore, the laundry 13 is determined based on the current value applied to the drive motor 4 detected by the current detection means 22 or the fluctuation amount of the current value. Can be determined. Further, the unbalance position of the laundry 13 can be determined from the torque fluctuation (phase).

  When the rotation of the drum 3 is maintained at the rotation speed described above and the current value is detected by the current detection means 22, the laundry 13 sticks to the inner wall and an eccentric 13a (unbalance) is generated, and the drum 3 rotates once (1). It is possible to detect the eccentric position and the eccentric amount due to the deviation of the laundry 13 within the period). In this embodiment, the rotation speed is set to 80 rpm at which it is easy to confirm the bias of the laundry. The control means 6a determines the eccentric position of the drum 3 at this time, that is, the eccentric position and the eccentric amount of the laundry 13.

  Here, the eccentric position detection in the direction of the rotating shaft 31 will be described. In this embodiment, the vibration detection means 12 is a triaxial acceleration sensor. The up / down direction, left / right direction, and front / rear direction of the water tank 2 are detected, and the unbalance position is detected by the phase difference of each axis according to the unbalance position. When the unbalanced position is on the front side of the drum 3, the phase difference between the left and right direction and the front and rear direction of the water tank 2 is increased. When the unbalanced position is on the rear side of the drum 3, the phase difference in the two directions is small. Therefore, the control unit 6 a can determine the unbalanced position based on the signal detected by the vibration detecting unit 12.

  Next, the detection of the eccentric position in the circumferential direction of the drum 3 will be described. In this embodiment, the eccentricity detection means 20 monitors the current value (torque current) and phase applied to the drive motor 4. The eccentric position is obtained from the period of the fluctuating current.

  When the imbalance is downward on the rotating drum 3, it is lifted upward against the weight of the imbalance, so that a large amount of current is consumed and the current value detected by the current detection means 22 increases. On the contrary, when the unbalance is at the upper part of the drum 3, the current consumption is minimized because it is taken downward in the direction of gravity. For this reason, the current value detected by the current detection means 22 decreases. Thus, when the drum 3 is unbalanced, the applied current of the drive motor 4 fluctuates, and the applied current is linked to the unbalanced position when the drum 3 is rotated. Also, the applied current value increases in proportion to the amount of unbalance.

  FIG. 6A shows a case where the unbalance of the water tank is large, and FIG. 6B shows a case where the unbalance of the water tank is small. As shown in FIG. 6A, if the unbalance amount is large, the maximum current value or the current fluctuation value becomes large. As shown in FIG. 6B, if the unbalance amount is small, the maximum current value or the current fluctuation value is small. Therefore, the amount of eccentricity (unbalance amount) can be determined by the magnitude of the current value.

  Next, how to start up the drum 3 up to the resonance rotational speed will be described with reference to FIG.

First, when the dehydrating operation is started, the drum 3 is raised to 80 rpm and maintained so that the ball 8 is stopped without rotating at the lower part in the annular container 17. The position and amount of the eccentric 13a of the laundry 13 are determined. Next, the control means 6a accelerates the drum 3 from the state where the ball 8 remains at the lower part of the water tank 2 (point A in FIG. 4). As the rotational speed of the drum 3 increases, the centrifugal force increases and the ball 8 starts to rotate together with the drum 3 (ii in FIG. 4). The control means 6a detects the amount of eccentricity of the entire water tank 2 during acceleration. As the position of the ball 8 and the eccentric 13a of the laundry 13 deviates from the opposite position, the amount of eccentricity increases and the water tank 2 vibrates greatly. When it is determined that the eccentricity value is larger than the predetermined threshold value X, the control means 6a controls the drum rotation acceleration so as to be smaller than the threshold value X (point B in FIG. 4). Then, it passes through the resonance rotational speed in a state of being smaller than the predetermined threshold value X, and accelerates at a stretch to a rotational speed higher than the resonance rotational region.

  In addition, when controlling the acceleration of drum rotation, the time of acceleration such as spreading between a plurality of balls 8 or the amount of imbalance being reduced due to the moisture of the laundry 13 being reduced with the rotation of the drum 3 due to centrifugal force. In some cases, the ball 8 and the laundry 13 cannot be controlled to face each other only by the information at.

  However, the control means 6a detects the amount of eccentricity of the entire water tank 2 during acceleration. As the deviation from the position where the unbalanced position of the ball 8 and the laundry 13 is opposite to each other increases, the amount of eccentricity increases, and the aquarium 2 vibrates greatly. The control means 6a controls the acceleration of the drum rotation so that the value of the eccentricity is smaller than a predetermined threshold, passes through the resonance rotation speed in a state of being smaller than the predetermined threshold, and has a rotation speed higher than that of the resonance rotation region. Accelerate all at once. As a result, the vibration of the drum can always be minimized.

(Embodiment 2)
Another embodiment of how to start up the drum will be described. Based on the signal obtained by the eccentricity detecting means 20, the control means 6 a of the present embodiment, the eccentric amount and the eccentric position of the drum 3 before accelerating the drum 3, the unbalance during accelerating the drum 3, and the ball 8 The position of each rolling element during acceleration of the drum is determined from the eccentric amount of the drum 3 that rotates together, and the drive motor is controlled so that each rolling element and the unbalance of the laundry are opposite to each other. Is to do. The other embodiments use the first embodiment. Hereinafter, different points will be described.

  As shown in the first embodiment, in the step of detecting the position of the unbalanced drum 3 in the circumferential direction, the unbalanced amount of the laundry 13 sticking to the drum 3 is obtained by keeping the ball 8 below the drum 3. An unbalanced position can be determined. The weight of the ball 8 in the annular container 17 is also known. Next, since the unbalance during acceleration sticks to the drum 3 more than before acceleration due to an increase in centrifugal force, it does not move. Therefore, the position of the eccentric 13a during acceleration can always be grasped. Further, since the position of the ball 8 depends on the speed of the drum 3, it can always be grasped.

  Further, a decrease in the unbalance amount during acceleration can be assumed by inferring from the vibration displacement of the drum 3 by the eccentricity detection means 20 and the decrease in the current value of the drive motor 4 detected by the current detection means 22. The total unbalance amount of the eccentric 13 a of the laundry 13 and the ball 8 can be determined from the vibration displacement of the drum 3.

  Further, the eccentric position and eccentric amount of the drum during acceleration are determined based on the amount and position of the eccentric 13a before acceleration and the speed and acceleration of the drum 3, and the position of the ball 8 being accelerated is determined. It is possible to control the rotation of the drum 3 so as to be opposed to each other. Details of how to start up the drum will be described below.

  The process is the same as in the first embodiment until the drum 3 is maintained at a constant rotational speed of 80 rpm.

  Next, the control means 6a accelerates the drum 3 from the state where the ball 8 remains at the lower part of the water tank 2 (point A in FIG. 4). As the rotational speed of the drum 3 increases, the centrifugal force increases and the ball 8 starts to rotate together with the drum 3. At this time, the dynamic balance of the drum 3 may not be achieved due to the influence of both the ball 8 and the laundry 13 (ii in FIG. 4)).

Since the control means 6a detects the unbalance position at a constant speed of 80 rpm,
The unbalanced position of the laundry 13 at the start of acceleration is grasped. Therefore, the position of the eccentric 13a of the laundry 13 at an arbitrary time during acceleration can be estimated from the drum rotation speed. In addition, the position of the ball 8 at the start of acceleration can be estimated by storing the position of the ball 8 according to the rotational speed in advance. Therefore, the control means 6a can grasp the relative positional relationship between the ball 8 and the eccentric 13a of the laundry 13 at an arbitrary time during the acceleration rotation.

  The control means 6a controls the drive motor 4 so that the ball 8 and the eccentricity 13a of the laundry 13 are offset from each other so that the unbalance of the drum 3 as a whole does not occur. Next, the drive motor 4 is controlled (B in FIG. 4). In this operation, for example, by increasing or decreasing the acceleration of the drive motor 4 for a short time, the positional relationship between the ball 8 and the eccentric 13a of the laundry 13 is passed through the resonance rotational speed of the drum 3. Modify it to take it to the opposite position at the moment. For example, when the eccentricity 13a of the laundry 13 is relatively behind the ball 8 relative to the rotation direction of the drum 3, the acceleration of the drum 3 is temporarily increased so that the opposite position is reached. To. The laundry 13 can be moved relative to the ball 8 by changing the acceleration of the drum 3. And it accelerates at a stretch to the rotational speed higher than a resonance rotation area | region. In this way, the vibration is suppressed by bringing it to the opposite position at the drum resonance rotation speed at which the vibration due to unbalance increases ((iii) in FIG. 4).

  In the first embodiment, the acceleration of the drum 3 is changed when the amount of eccentricity is larger than the threshold value X. However, in the present embodiment, the positions of the ball 8 and the eccentric 13a are grasped and estimated. The rotational speed of the drum 3 can be raised to the resonant rotational speed so that the eccentricity does not become the threshold value X. Therefore, it is possible to start up smoothly without causing a large vibration before the resonance rotational speed is reached.

  In addition, when controlling the acceleration of drum rotation, the time of acceleration such as spreading between a plurality of balls 8 or the amount of imbalance being reduced due to the moisture of the laundry 13 being reduced with the rotation of the drum 3 due to centrifugal force. In some cases, the ball 8 and the laundry 13 cannot be controlled to face each other only by the information at.

  However, the control means 6a detects the amount of eccentricity of the entire water tank 2 during acceleration. The greater the deviation from the position where the ball 8 and the eccentric 13a of the laundry 13 face each other, the greater the amount of eccentricity, and the water tank 2 vibrates greatly. Therefore, the control means 6a controls the acceleration of the rotation of the drum 3 so that the value of the eccentricity becomes smaller than a predetermined threshold value. In a state where the current value detected by the current detection means 22 or the fluctuation amount of the current value is smaller than a predetermined threshold value, acceleration is accelerated to a rotational speed higher than the resonance rotational region. Thereby, a big vibration does not generate | occur | produce at the time of passing through a resonance rotational speed range, but a dehydration process can be performed.

  With this configuration, since the position of the ball 8 during acceleration of the drum 3 can be determined by analysis, the drum can be controlled quickly and accurately at a position where the laundry unbalance and the ball face each other. . For this reason, the vibration of the drum that becomes large before and after passing through the resonance rotation can be minimized over a wide range.

  The washing machine according to the present invention can raise the drum so that the ball can obtain a vibration suppression effect against the unbalance, so that the unbalance can be further reduced and the vibration at the start-up can be suppressed. It is useful as a drum-type washing machine and a cleaning device for home use and business use.

DESCRIPTION OF SYMBOLS 1 Drum type washing machine 2 Water tank 3 Drum 4 Drive motor 5 Damper 6a Control means 8 Ball (rolling element)
DESCRIPTION OF SYMBOLS 10 Spring 12 Vibration detection means 13 Laundry 16 Baffle 17 Annular container 18 Viscous fluid 20 Eccentricity detection means 22 Current detection means 30 Ball balancer (balancing means)
31 Rotating shaft

Claims (4)

A bottomed cylindrical drum rotatably supported on a horizontal or inclined rotating shaft;
A water tank containing the drum;
A drive motor for driving the drum;
An annular container provided integrally with the drum;
A plurality of rolling elements movably accommodated in the annular container;
Eccentricity detecting means for detecting the eccentricity of the laundry in the drum and the eccentric state of the drum caused by the rolling elements when the drum rotates.
A control means for analyzing the eccentric position detected by the eccentricity detection means and controlling the drive motor;
The control means includes
The eccentricity detecting means detects the eccentric state of the drum in a state where the laundry in the drum does not fall and the drum is rotated at a rotational speed at which the rolling element stays in the lower part of the drum. Drum-type washing machine featuring. The eccentricity detecting means detects the eccentric position of the drum,
The control means includes
After detecting the eccentric state of the drum by the eccentricity detecting means, when the drum is accelerated and the rotational speed of the drum passes through the resonance rotational speed, the eccentric position of the drum is opposed to the rolling element. The drum type washing machine according to claim 1, wherein the driving motor is controlled as described above. The eccentricity detecting means detects the amount of eccentricity of the drum,
The control means controls the drive motor so that the eccentric amount of the drum becomes smaller than the predetermined threshold when detecting that the eccentric amount of the drum is larger than a predetermined threshold during the acceleration operation of the drum. The drum type washing machine according to claim 1 or 2, wherein the drum type washing machine is provided. The control means includes
The acceleration of the drum up to the resonance rotational speed is determined by the eccentric position of the drum before the drum acceleration and the position of the rolling element,
4. The drive motor according to claim 1, wherein when the rotational speed of the drum passes a resonance rotational speed, the drive motor is controlled so that the rolling elements and the unbalance of the laundry are in opposite positions. The drum-type washing machine according to any one of the above.