JP2005230315A - Drum washing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drum washing machine that smoothly spin-dries the laundries eliminating the unevenness of laundries inside a rotating drum during the spin-drying operation and controls to prevent spin-drying from stopping. <P>SOLUTION: A rotating drum 1 is started up at a rotating speed which laundries can easily cling to the internal wall during the spin-drying operation and when the balance of clothes is assessed unacceptable at a prescribed number of rotations it changes the value for assessing the balance of the clothes and restarts the spin-drying operation. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a drum-type washing machine for washing laundry stored in a rotating drum by rotationally driving a rotating drum disposed in a water tank.

  An example of a conventional structure of a drum type washing machine is shown in FIG. As shown in the figure, a rotating drum 51 having a large number of through holes 52 formed in the peripheral surface is disposed in a water tub 53 supported by a suspension structure in a washing machine casing 57. The rotating drum 51 is a drum drive motor 55. The laundry is driven from the inside of the rotating drum 51 through the front opening of the water tank 53 and the front opening of the rotating drum 51 by opening the door body 54 that is rotationally driven by the door and provided to be openable and closable on the front side of the washing machine casing 57. It is configured so that it can be taken in and out.

  When the door body 54 is opened, laundry is put into the rotating drum 51, and detergent is added to start the operation, water is supplied into the water tank 53, and the supplied water passes through the through-hole 52 and the rotating drum 51. The required amount of water is also supplied. When the rotary drum 51 is rotationally driven by the drum drive motor 55 at a predetermined rotational speed, the laundry stored in the rotary drum 51 is hooked on the stirring protrusion 56 provided on the inner peripheral surface of the rotary drum 51 and rotated in the rotational direction. When the laundry is lifted and dropped from an appropriate height, washing is performed by applying a tapping wash action to the laundry. After this washing process, the dirty washing water is drained, and the rinsing process is performed using newly supplied water. When the rinsing process is completed, the rotating drum 51 is rotated at a high speed, and the dehydrating process is performed. These steps are automatically executed based on a predetermined control procedure (see Patent Document 1).

In the drum type washing machine, when the rotary drum 51 is stationary, the laundry is biased below the rotary drum 51. After the washing process and the rinsing process, the laundry is drained from the rotary drum 51, and the rotary drum 51 is rotated at high speed for washing. When performing a dehydration operation for dewatering from an object by centrifugal force, if the laundry is left biased to one side, the center of gravity of the rotating drum 51 becomes unbalanced and a large vibration occurs, so that a normal dehydration operation cannot be performed. There is a case. In the drum type washing machine according to the prior art, the cloth unraveling step of rotating the rotary drum 51 at the first rotational speed, the cloth balancing step of increasing from the first rotational speed to the second rotational speed, and the third Control is performed so that the dehydrating operation is performed after a preliminary dehydration step of rotating the rotating drum 51 a predetermined number of times at a rotational speed of 2 and a balance determination step of detecting the balance of the laundry at the second rotational speed after the preliminary dehydration step. doing.
Japanese Patent Laid-Open No. 10-201985 (pages 3-5, FIG. 1)

  However, in the above-described conventional dehydration control, since the control operation up to the actual dehydration operation is complicated and time-consuming, there is a problem that the cost is increased and the overall time required for washing is increased. It was.

  Also, if the laundry has a string-like thing or a long belt-like thing, the laundry may be intertwined in the process of being easy to wash, so it will not be solved by any control action There is a case. In this case, since there is no means for prompting the user to eliminate the entanglement of the laundry, there has been a problem that the dehydration operation is stopped without being able to eliminate the imbalance of the laundry.

  The purpose of the present invention is to control the smoothness of the dehydration operation performed after each washing and rinsing process and to enable a countermeasure operation when the laundry imbalance is not eliminated. It is to provide a type washing machine.

  In order to achieve the above object, a drum type washing machine according to the present invention includes a rotating drum having a rotation center axis in a substantially horizontal direction or a direction inclined from the horizontal direction, and the rotating drum elastically supported in a washing machine casing. A water tank to enclose, a drum drive motor for rotationally driving the rotary drum, and a control means for controlling the rotation of the drum drive motor, the control means washing the rotary drum on its inner peripheral wall in the dehydrating operation in each step. The cloth is started up to a first predetermined rotation speed at which the article is easily stuck, and a cloth balance determination is performed with a predetermined initial determination value to determine whether the laundry is evenly attached to the inner peripheral wall. When the balance judgment does not determine that the balance is good, the operation until the cloth balance judgment is repeated, and when the number of repetitions reaches the predetermined number, the initial judgment value is within the allowable range. The operation of changing to a change determination value that increases and repeating the operation leading to the cloth balance determination is performed, and when the cloth balance is determined to be good based on the initial determination value or the change determination value, the rotating drum is controlled to have a dehydrating rotation speed. And

  According to the above configuration, when the determination of good balance is not made in the determination of the cloth balance, the rising operation to the dehydration operation is repeated a predetermined number of times, so that the state of the laundry in the rotating drum is likely to change, and the laundry Even in the state where entangled, it becomes easy to be solved by repetition. In addition, if the laundry is intertwined in a complicated manner and the fabric balance does not reach a state where the initial judgment value is judged to be well balanced, the initial judgment value is changed to a change judgment value with a wide tolerance range, so there is a slight unbalance. Even if there is, it is unlikely that the dehydration operation is started and the dehydration operation is stopped halfway.

  In the above configuration, when the control means performs control so that abnormality notification is executed by the abnormality notification means when the number of repetitions based on the change determination value reaches a predetermined number, there is a tangled laundry that cannot be resolved by the control operation. Also, it is possible to notify the user of an abnormality and prompt the user to take action to eliminate the entanglement.

  In addition, when it is determined that the cloth balance is good based on the change determination value, the control means performs a second dehydration speed that is lower than a predetermined dewatering rotation speed when the cloth balance is determined to be good based on the initial determination value. If control is performed so that the dehydration operation is executed at the rotational speed, the dehydration operation will not stop without unbalance of the laundry being eliminated by the control operation, and the dehydration operation will proceed even if there is a slight imbalance. Can be made. At this time, the dehydration rotation speed is lowered to the second dehydration rotation speed and the dehydration capability is lowered. Therefore, if the dehydration time is controlled to be extended, the dehydration state becomes almost the same as that according to the dehydration rotation speed.

  Further, if the rotational driving direction of the rotating drum when starting up to the first predetermined rotational speed is controlled so as to be changed every number of repetitions, the direction of action applied to the laundry is different, so that the state where the laundry is entangled is easily resolved. Become.

  According to the present invention, in the dehydrating operation performed after each of the washing and rinsing steps, the dewatering operation is performed when the laundry distribution state in the rotating drum is determined as the cloth balance and the balance is not determined to be good. Since the washing operation in the rotating drum is easy to change, even when the laundry is in an intertwined state, it is easily resolved by repetition, and the laundry is intertwined in a complicated manner. If the balance does not reach a state where the balance is determined to be good with the initial determination value, the initial determination value is changed to a change determination value with a wide allowable range, so the dehydration operation is started even if there is a slight imbalance. As a result, the dehydrating operation is unlikely to stop halfway. At this time, since the dehydration operation is controlled so that the dehydration rotation speed is lower than the predetermined dehydration rotation speed, the dehydration operation can proceed even if there is an imbalance. In addition, if the abnormality notification means performs control so that abnormality notification is executed, even if there is a tangled laundry that cannot be resolved by the control operation, the user is notified of the abnormality and prompts the user to take action to eliminate the entanglement. Can do.

  FIG. 1 shows a configuration of a main part of a drum type washing machine according to an embodiment. A water tank 3 is supported in a washing machine housing 9 by a suspension structure (not shown), and the water tank 3 has a bottomed cylindrical shape. The formed rotating drum 1 is arranged with its rotating shaft direction inclined from the horizontal direction.

  The rotating drum 1 has a bottomed cylindrical opening side on the front side of the washing machine housing 9 and a bottom surface on the back side of the washing machine housing 9 so that the rotation axis direction is from the front side to the back side. It is arranged in the water tank 3 so as to be inclined downward, and is rotated by a drum drive motor 5 attached to the back surface of the water tank 3. An opening 8 for taking in and out the laundry from the rotary drum 1 is formed on the front side of the water tub 3, and an inclined surface formed on the front side of the washing machine housing 9 so as to face the opening 8 A door body 7 is provided to be freely opened and closed. Since the opening 8 opens upward and the door body 7 is provided on the upward inclined surface, the laundry 7 can be easily put in and out of the rotating drum 1 by opening the door body 7. By forming a part or the whole of the door body 7 with a transparent body, the inside of the rotary drum 1 can be easily seen through from the outside.

  When the rotating drum 1 is inclined as in the above-described configuration, the work for putting in and out the laundry is facilitated, and the water supplied into the rotating drum 1 is accumulated on the back side, and a deep water storage state can be obtained even with a small amount of water. On the other hand, the laundry housed in the rotating drum 1 gathers at the bottom of the bottom side, which is the lowest position, and the laundry position is changed to give all the laundry evenly. There arises a problem that it is difficult to obtain a state in which the laundry is evenly adhered to the inner peripheral wall of the rotating drum 1 in the action and the dehydrating operation. As means for solving this problem, in this embodiment, the shape of the stirring protrusions 6 provided at a plurality of positions on the inner peripheral wall of the rotating drum 1 and the rotation driving of the rotating drum 1 by the drum driving motor 5 are controlled. The position is changed.

  The agitation protrusion 6 is formed in a shape having a top portion that is formed long in a predetermined inclination angle direction from the rotation axis direction of the rotating drum 1, and tends to be biased to a lower position of the rotating drum 1 when the rotating drum 1 rotates. The effect | action which moves the laundry which becomes to a high position can be acquired effectively. When such a stirring protrusion 6 rotates the rotating drum 1 attached to a plurality of locations on the inner peripheral wall, the laundry that tends to be biased to the lower position side in the inclined rotating drum 1 is lifted to the higher position side. Therefore, even if the rotating drum 1 is inclined, the laundry is sufficiently agitated without being biased toward the lower side of the rotating drum 1, and the laundry is easily replaced and mixed, and the cleaning effect is not reduced. In addition, when the amount of laundry is small, the amount of washing liquid is also small, and in order to obtain a state where all the laundry is evenly immersed, it is necessary to stir so that the place of the laundry is sufficiently replaced However, since the position of the laundry is sufficiently changed, there is no unevenness in washing and the cleaning power can be improved.

  FIG. 2 shows a control configuration of the drum type washing machine configured as described above. The control means 16 for controlling the operation of the drum type washing machine controls the operations of the drum drive motor 5, the water supply valve 12, and the drain valve 11. It is configured to be able to. When the input setting unit 17 and the display unit 18 provided on the surface of the washing machine casing 9 perform selection input of the driving course from the input setting unit 17, the selection state and the driving state are displayed on the display unit 18. The means 16 controls the drum drive motor 5, the water supply valve 12, and the drain valve 11 in accordance with the operation procedure. The operation of the drum type washing machine whose operation is controlled by the control means 16 will be described below with reference to FIGS.

  Open the door body 7, put the laundry into the rotating drum 1, put the detergent through the detergent inlet provided in the water supply unit 15, and press the power on button 17f from the operation panel shown in FIG. Then, when the selection of the driving course corresponding to the type of laundry is input from the course selection button 17d and the start / pause button 17e is pressed to input the operation start, the driving control by the control means 16 is started. The operation of the drum-type washing machine is basically executed in the order of a washing process, a rinsing process, and a dehydration process, and when a drying function is provided, the drying process can be arbitrarily performed.

  First, the control means 16 outputs a control command for rotationally driving the rotary drum 1 at a predetermined rotational speed to the drive circuit 22 in order to detect the amount of laundry put into the rotary drum 1. When the drum drive motor 5 driven and controlled by the drive circuit 22 rotates the rotary drum 1, the cloth amount detection means 27 detects the amount of laundry from the load state received by the drum drive motor 5 corresponding to the amount of laundry. Detect.

  That is, the drum drive motor 5 is configured as a DC brushless motor, and as shown in FIG. 2, the drive circuit 22 is an inverter 23 that controls energization to the three-phase windings 5a, 5b, and 5c constituting the stator of the drum drive motor 5. The switching elements 23a to 23f are controlled to be switched. The DC power supplied to the inverter 23 is a DC current obtained by rectifying commercial power 28 using a diode bridge circuit 29, a choke coil 30, and a smoothing capacitor 31, and the load state received by the drum drive motor 5 is almost equal to the input current. Since the load detection means 24 detects the input current value by the current detection circuit 26 from the voltage across the resistor 25 disposed in series with the DC power supply circuit to the inverter 23, the cloth amount detection means 27 The amount of laundry put into the rotating drum 1 is detected from the current value. The amount of laundry detected by the cloth amount detection means 27 is stored in a memory provided in the control means 16 for use in a control operation described later.

  Next, since the control means 16 outputs a control command for opening the water supply valve 12 to the load driving means 20, the tap water supplied from the water supply hose that is opened and connected to the water supply section 15 is supplied to the water supply section 15. Water is fed into the water tank 3 while mixing the detergent put into the tank. The amount of water supplied into the water tank 3 is set to a water supply time corresponding to the amount of laundry detected by the cloth amount detection means 27. The water level supplied to the water tank 3 is detected by the water level detection means 19 provided in the water tank 3, and when the water level reaches the specified water level, a specified water level detection signal is input from the water level detection means 19 to the control means 16. Therefore, the control means 16 outputs a control command for closing the water supply valve 12 to the load driving means 20 to stop the water supply. The water supplied into the water tank 3 is absorbed by the laundry accommodated in the rotary drum 1 through the through holes 2 formed in the rotary drum 1, and the water level in the water tank 3 is lowered. The same is done.

  Since the washing process can be started by the above control operation, the control means 16 outputs a control command for the rotational drive of the rotary drum 1 by the drum drive motor 5 to the drive circuit 22. The rotary drum 1 is driven to rotate in the forward direction for a predetermined time at a predetermined rotational speed, then stopped for a predetermined time, and then rotated in the reverse direction for a predetermined time and then stopped for a predetermined time. Is performed as a cycle, and a first agitation control operation is executed that repeats the required time. The predetermined rotation speed is a height at which the laundry hooked by the stirring protrusions 6 provided at a plurality of positions on the inner peripheral surface of the rotating drum 1 is lifted in the rotating direction by the rotation of the rotating drum 1 and the weight is higher than the centrifugal force. It is the rotational speed which shows the behavior which falls from a position. When the lifted laundry falls, the laundry has a beating-washing action, and by repeating this, a washing action is performed to remove dirt from the laundry that absorbs water containing detergent. Moreover, since only the thing which touches the stirring protrusion 6 is extracted from the stacked laundry, the effect | action which replaces the position of a laundry is made. When the rotation speed of the rotating drum 1 is lower than the predetermined rotation speed, the stirring protrusion 6 cannot lift the laundry, and when the rotation speed of the rotating drum 1 is higher than the predetermined rotation speed, the influence of centrifugal force is exerted. Since it becomes large, the lifted laundry will not fall due to its own weight. Further, by reversing the rotation direction of the rotary drum 1, the laundry is prevented from being twisted, and the position can be effectively replaced.

  Since the action of tapping to lift and drop the laundry is affected by the amount of laundry accommodated in the rotating drum 1, it is a more preferable control method to change the predetermined rotational speed depending on the amount of laundry. . That is, since the amount of laundry stored in the rotary drum 1 is detected and stored by the cloth amount detecting means 27 as described above, the control is performed when the amount of laundry is larger than a predetermined amount. The means 16 controls the rotational speed to be a predetermined rotational speed. On the other hand, when the stored amount of laundry is smaller than a predetermined amount set in advance, the control means 16 performs control so that the rotation speed is increased by increasing the predetermined rotation speed. Even if the first stirring control operation is controlled so as to repeat the required washing time, the effect of washing while changing the position of the laundry can be obtained. However, after the first stirring control operation is executed for the required time, the second stirring control is performed. It is possible to obtain a more preferable effect by executing the operation.

  In the second agitation control operation, the rotary drum 1 is rotated in the forward direction for a predetermined time at a predetermined rotational speed faster than the first agitation control operation, and then the rotational drive is stopped for a predetermined time, and then in the forward direction in the reverse direction. The control operation in which the rotation drive is stopped for a predetermined time after the rotation drive for a predetermined time at the same predetermined rotation speed as one cycle is repeated for a required time. The predetermined rotation speed in the second stirring control operation is a rotation speed at which the laundry can be stuck to the inner peripheral wall of the rotary drum 1 by centrifugal force generated by rotating the rotary drum 1. When the laundry is stuck to the inner peripheral wall of the rotating drum 1, the lump-shaped laundry is also expanded to a developed state, and the laundry that has moved above the rotating drum 1 is stopped rotating for a predetermined time. , It falls away from the inner peripheral wall of the rotating drum 1 that rotates by inertia. By spreading and dropping due to this sticking, the position and shape of the laundry are changed, and the action of tapping is also effectively performed.

  As the control operation for alternately executing the first and second agitation control operations is continued for the required time, the laundry is repositioned back and forth in the rotating drum 1 and at the same time, the beating wash having different behavior Even when the rotary drum 1 is inclined and arranged, it is possible to give a uniform cleaning power to all the laundry without deteriorating the cleaning performance.

  When the washing process is completed as described above, the control means 16 outputs a control command for opening the drain valve 11 to the load driving means 20, so that a drain control operation for discharging dirty washing water in the water tank 3 is executed. The Furthermore, since the control means 16 rotates the drum drive motor 5 at high speed and outputs a control command for dehydrating the wash water contained in the laundry to the drive circuit 22, the dehydration operation after the washing process is performed.

  After the dehydration operation for a predetermined time is performed, the control means 16 closes the drain valve 11, opens the water supply valve 12, and starts a rinsing process for newly supplying tap water into the water tank 3. Even in the rinsing step, the rotating drum 1 is rotated in the forward and reverse directions and is rotated, and the first stirring control operation and / or the second stirring control operation in the washing step described above is executed. Thus, since the action of tapping is uniformly applied to all the laundry by changing the position of the laundry, rinsing without rinsing unevenness is performed.

  As shown in FIG. 4, after the washing step, usually two rinsing steps are performed, and after each rinsing step, a dehydrating operation is performed to dehydrate the water contained in the laundry, and the second rinsing is performed. The dehydration operation in the process is a dehydration process. That is, the dehydrating operation is performed as a dehydrating operation in which the rotating drum 1 is rotated at a high speed after draining and dehydrated from the laundry including the above-described washing process. In order to ensure the dehydration operation in each step, the laundry is evenly attached to the inner peripheral wall of the rotary drum 1 and the water contained in the laundry is brought into the water tank 3 from the through holes 2 by centrifugal force. It is necessary to get out of it. If the laundry is in a state of being biased in the rotating drum 1, not only will the dewatering be performed smoothly, but also the rotating drum 1 may be shaken or vibrated due to the bias in the center of gravity, so dehydration is started at the start of the dewatering operation The action is executed. Hereinafter, the first to third control procedures will be sequentially described with respect to the control procedure of the dehydration operation.

  FIG. 5 shows a first control procedure for executing the start-up operation in the dehydrating operation in the control means 16. The numbers S1, S2,... Shown in each procedure are step numbers of the control procedure and coincide with the numbers appended in the text.

  When the dehydrating operation is started, a predetermined initial determination value for determining whether or not the cloth balance is good is set (S1), the number of determination repetitions is initialized (N = 1) (S2), and the drum drive motor 5 is then started. Is raised to a first predetermined rotational speed (for example, 90 r / min) (S3). The time required until the drum drive motor 5 is raised to the first predetermined rotation speed is controlled based on the data detected by the cloth amount detection means 27 and stored in the control means 16. As shown in FIG. 6 (a), when the amount of laundry is large, the rotational speed of the drum drive motor 5 raised to the second predetermined rotational speed (for example, 40 r / min) at the first predetermined time t1 is set to the first rotational speed. 2 until the third predetermined time t3 is maintained until the first predetermined rotation speed t2, and when the amount of laundry is small, as shown in FIG. Control is performed so that the time (t2 to t3 ′) from the predetermined time t2 until the first predetermined rotational speed is reached is shortened. Since the centrifugal force is larger than the gravity acting on the laundry by this control, the laundry tends to stick to the inner peripheral wall of the rotating drum 1.

  If the laundry is in a state of evenly sticking to the inner peripheral wall of the rotating drum 1, the rotating drum 1 rotates normally without uneven rotation. Therefore, in the cloth balance determination (S4), it is determined that the balance is good. The means 16 can be dehydrated from the laundry by a dehydrating operation (S14) for rotating the drum drive motor 5 at a high speed.

  The determination of the cloth balance is made by detecting the rotation unevenness of the rotary drum 1. As shown in FIG. 2, the stator of the drum drive motor 5 configured as a DC brushless motor has position detection means 21a composed of Hall ICs at intervals of 120 degrees in electrical angle so as to face the permanent magnets of the rotor. 21b and 21c are provided, and when the rotor makes one rotation, the magnetic field of the permanent magnet is detected by the position detection means 21a, 21b and 21c, so that pulses are input to the control means 16 at intervals of 120 electrical degrees. . Based on this pulse input, the control means 16 switches on / off states of the switching elements 23a to 23f and controls energization to the first winding 5a, the second winding 5b, and the third winding 5c of the stator. The rotor is rotated by the magnetic field generated by the first winding 5a, the second winding 5b, and the third winding 5c. The switching elements 23a, 23c, and 23e are each controlled by pulse width modulation (PWM), and the energization ratio is controlled at a predetermined repetition frequency so as to control the rotational speed of the rotor. The switching elements 23a, 23c, and 23e are subjected to PWM control so that the rotational speed of the rotor is calculated from the pulse periods output from the three position detecting means 21a, 21b, and 21c and the set rotational speed is obtained. Therefore, if it is detected that the pulses from the position detection means 21a, 21b, 21c are not output at a predetermined interval while the rotation speed of the rotary drum 1 is kept at a predetermined rotation speed, the rotation drum 1 has a rotation unevenness. It can be determined that the generated state, that is, the state where the laundry is stuck to the inner peripheral wall and the cloth balance is poor. Therefore, the unbalanced state of the laundry in the rotary drum 1 can be detected by setting the fluctuation range of the rotational speed of the drum drive motor 5 as the cloth balance determination value.

If it is determined in the cloth balance determination (S4) that the rotation drum 1 is uneven in rotation, that is, the laundry is biased, the control means 16 stops the rotation of the rotation drum 1 (S5). It is determined whether or not the number of repetitions N has reached a first predetermined number of times (for example, N = 16) (S6). It is determined whether or not the predetermined number of times (for example, N = 8) has been reached (S7). If the second predetermined number has not been reached, 1 is added to the determination repetition number N (S9), and step S3 is performed. Return to the procedure from and start up again. On the other hand, in the determination of the repetition number N (S7), when the repetition number reaches the second predetermined number, the determination value is changed (S8), and 1 is added to the determination repetition number N (S9). Thereafter, the procedure returns to the procedure from step S3 and the start-up operation is executed again.

  In this way, when the number of repetitions reaches the second predetermined number, the dehydrating operation is started even if there is a slight imbalance by changing the determination value so that the allowable range of the cloth balance determination is widened. Therefore, the dehydrating operation is unlikely to be stopped halfway.

  After repeating the above operation, if it is determined in step S4 that the fabric balance is good, it is determined whether the number of repetitions N is 9 or more (S11). If the number of repetitions is not 9 or more, the determination value is corrected. Accordingly, the laundry is dehydrated by performing a dehydration operation (S14) at a predetermined dehydration rotation speed (for example, 900 r / min).

  On the other hand, if the number of repetitions is 9 or more in step S11, the determination value is corrected so that the allowable range of the cloth balance determination is widened, and vibration is likely to occur due to the bias of the laundry in the rotating drum 1. Then, the dehydration rotation speed is set to a second dehydration rotation speed (for example, 800 r / min) lower than the predetermined dehydration rotation speed (S12), and the dehydration time is extended as much as the dewatering capacity is reduced (S13). Then, a dehydrating operation (S14) is performed.

  In addition, even if the determination value is corrected so that the allowable range for determination of the cloth balance is widened in step 8, the cloth balance is not determined to be good in step 4, that is, the determination repetition count N is the first predetermined number. It is determined whether or not the number of times (for example, N = 16) has been reached (S6), and if the predetermined number of times has been reached, the state of the laundry is not improved by repeating the start-up operation. Since it is determined that there is a complicated entanglement or the like, the user is prompted to eliminate the entanglement of the laundry by anomaly notification by electronic sound or voice synthesis (S10). Although not shown at this time, it can be determined by the opening and closing of the door 7 that the user has taken measures to eliminate the tangling of the laundry, so when the opening and closing of the door 7 is detected, the number of repetitions N is initialized. The startup operation is executed again.

  Further, the determination of the cloth balance at the time of the dehydrating operation is performed as shown in FIG. 4 in each step of washing, rinsing, and dehydrating, so that it is performed in the dehydrating operation in each step.

  In addition, you may make it change the rotational drive direction of the rotating drum 1 when raising to the 1st predetermined rotation speed for every repetition frequency. If it does in this way, since the direction of action applied to the laundry is different, the state in which the laundry is intertwined is more easily resolved.

  As described above, according to the present invention, when the good balance is not determined in the determination of the cloth balance, the rising operation to the dehydrating operation is repeated a predetermined number of times, so that the state of the laundry in the rotating drum changes. Even if the laundry is in an intertwined state, it is easily resolved by repetition, and if the laundry is intertwined in a complicated manner and the cloth balance does not reach a state where the initial balance is judged to be good, the initial value Since the determination value is changed to a change determination value having a wide allowable range, even if there is a slight imbalance, the dehydration operation is not started and the dehydration operation is not stopped halfway. In addition, if the abnormality notification means performs control so that abnormality notification is executed, even if there is a tangled laundry that cannot be resolved by the control operation, the user is notified of the abnormality and prompts the user to take action to eliminate the entanglement. At this time, since the dehydration rotation speed is controlled to be executed at the second dehydration rotation speed lower than the predetermined dehydration rotation speed, the dehydration operation can proceed even if there is an imbalance. It is possible to provide a drum-type washing machine in which a dehydrating operation that is performed a plurality of times after each of the washing and rinsing steps is performed smoothly.

Sectional drawing which shows the principal part structure of the drum type washing machine which concerns on embodiment. The circuit diagram which shows the control structure in a drum type washing machine same as the above. The top view which shows the structure of the operation panel of a drum type washing machine same as the above. The figure which shows each process from a washing process to a dehydration process. The flowchart which shows the control procedure of dehydration operation. The graph explaining the starting operation | movement to dehydration rotation speed. Sectional drawing which shows the structure of the drum type washing machine which concerns on a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotating drum 3 Water tank 5 Drum drive motor 16 Control means

Claims (5)

A rotating drum having a rotation center axis in a substantially horizontal direction or a direction inclined from the horizontal direction, a water tank elastically supported in a washing machine casing and containing the rotating drum, a drum driving motor for rotating the rotating drum, Control means for controlling the rotation of the drum drive motor, and the control means raises the rotary drum to a first predetermined rotational speed at which the laundry easily sticks to the inner peripheral wall in the dehydrating operation in each step, Executes cloth balance determination on whether or not the laundry is evenly adhered to the peripheral wall with a predetermined initial determination value, and when the cloth balance determination based on the initial determination value does not determine that the balance is good, the operation reaches the cloth balance determination The initial determination value is changed to a change determination value that increases the allowable range when the number of repetitions reaches a predetermined number of times. Repetition, a drum type washing machine rotary drum when the cloth balance is determined good and controls so as to dewatering rotation speed by the initial determination value or change determination value. 2. The drum type washing machine according to claim 1, wherein the control unit controls the abnormality notification unit to perform abnormality notification when the number of repetitions based on the change determination value reaches a predetermined number. When it is determined that the cloth balance is good based on the change determination value, the control means sets the second spin rotation speed lower than the predetermined spin rotation speed when the cloth balance is determined to be good based on the initial determination value. The drum type washing machine according to claim 1, wherein the dehydrating operation is controlled in step 1. The drum-type washing machine according to claim 3, wherein the control means controls the dehydration time to be extended when the dehydration operation is performed at the second dehydration rotation speed. The drum type washing machine according to any one of claims 1 to 4, wherein the control means controls to change the rotational driving direction of the rotating drum at the time of starting up to the first predetermined rotational speed for each repetition.

Images