JP4419833B2 - Drum washing machine - Google Patents

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.

  A conventional structure example of a drum type washing machine will be described with reference to FIG.

  In FIG. 7, a rotating drum 51 having a large number of through holes 52 formed in the peripheral surface is disposed in a water tub 53 elastically supported by a suspension structure in a washing machine casing 57 of the drum type washing machine. 51 is rotationally driven by a motor 55 and opens a door body 54 that is openable and closable on the front side of the washing machine casing 57, thereby allowing the laundry to pass through the front opening 53a of the water tank 53 and the front opening 51a of the rotary drum 51. Can be taken in and out of the rotary drum 51.

  When the door body 54 is opened, laundry is put into the rotating drum 51, detergent is added and operation is started, water is supplied into the water tank 53, and the supplied water enters the rotating drum 51 through the through holes 52. The required amount of water is also supplied. When the rotary drum 51 is rotationally driven by the 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 lifted in the rotation direction. When the laundry is dropped from an appropriate height, washing is performed by applying a washing action to the laundry.

  After this washing process, the dirty washing water is drained, and a rinsing process is performed using newly supplied water. When the rinsing process is completed, the rotating drum 51 is rotated at a high speed to perform a dewatering process. These steps are automatically executed based on a predetermined control procedure (see, for example, 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 a high speed. When performing a dehydrating operation for dehydrating laundry by centrifugal force, if the laundry is biased to one side, a large vibration may occur and normal dehydrating operation may not be performed.

  In the drum type washing machine, the cloth unwinding process for rotating the rotating drum 51 at the first rotation speed, the cloth balance process for increasing the first rotation speed to the second rotation speed, and the third rotation speed. A preliminary dehydration process in which the rotating drum 51 is rotated a predetermined number of times and a balance determination process in which the balance of the laundry is detected at the second rotational speed after the preliminary dehydration process are performed, and the dehydration operation is performed when it is determined that the balance state is good. It is controlled to be executed.

In the balance determination process, the determination value for determining whether the balance state is good or bad is changed based on the result of detecting the amount of laundry when the laundry is dry at the start of operation. .
Japanese Patent Laid-Open No. 10-201985 (pages 3-5, FIG. 1)

  However, in the dehydration control according to the conventional drum type washing machine, when the dry laundry is put into the rotating drum 51 and the laundry is operated from the beginning, the amount of the laundry is detected in the balance determination process at the time of dehydration. Although an appropriate judgment value is set based on the result, when only washing or rinsing laundry other than the washing machine is performed, the amount of dry laundry cannot be detected. Therefore, there is a problem that the dehydration operation is not performed because it is difficult to determine that the balance state is good.

  The present invention solves the above-mentioned conventional problems, detects the amount of laundry in a wet state, and according to the amount, corrects the determination value at the time of cloth balance determination, and according to the amount of laundry An object of the present invention is to provide a drum type washing machine in which a dehydration operation is performed smoothly.

In order to solve the above-described conventional problems, a drum-type washing machine of the present invention includes a rotating drum having a substantially horizontal or inclined rotation center shaft, and elastically supported in a washing machine casing, and rotatably includes the rotating drum. A water tank, a motor for rotationally driving the rotary drum, a control means for controlling the rotation of the motor, a rotational speed detecting means for detecting the rotational speed of the motor or the rotary drum, and a current flowing through the motor. Current detecting means for detecting , and in the dehydrating operation after each washing and / or rinsing process, the control means sets the rotating drum to a first predetermined rotational speed for determining the cloth balance from a substantially stationary state. when launching detects the amount of the rotating laundry accommodated in the drum based on a signal from said current detecting means and the rotational speed detection means, said first predetermined Wherein the drum-type washing machine controls to rotate the rotary drum if determined cloth balance is determined as good in the dehydration speed in rotation speed, when the input current value detected by said current detecting means is stable If the rotational speed of the motor or the rotating drum is equal to or lower than a second predetermined rotational speed that is lower than the first predetermined rotational speed, it is determined that the laundry has stuck in the rotating drum and is washed. The amount of material is regarded as a small amount, and the judgment value at the time of cloth balance judgment is corrected so that it is easy to judge that the cloth balance is good. also not able to detect the quantity of laundry, can determine if the laundry in the dehydrating operation performed after each stroke of the washing ease too is small, cloth determination value at the time of determination cloth balance Lance is corrected so as to be easily determined as good, without the amount special operation for detecting the laundry, when the laundry is small, cloth launching the first predetermined rotational speed The balance determination is not repeated many times, and the dehydrating operation can be performed smoothly.

The drum type washing machine of the present invention is executed after each washing and rinsing process even if the amount of laundry in a dry state cannot be detected, including partial operation states such as only dehydration. Since it is possible to judge when the amount of laundry is small in the dehydration operation, the judgment value at the time of cloth balance judgment is corrected so that the cloth balance is easily judged to be good, so it is special for detecting the amount of laundry. When the amount of laundry is small without performing a proper operation, the cloth balance determination is not repeated many times after the first predetermined rotational speed is raised, and the dehydration operation can be performed smoothly.

A first invention includes a rotating drum having a substantially horizontal or inclined rotation center axis, a water tank elastically supported in a washing machine casing and rotatably enclosing the rotating drum, a motor for rotating the rotating drum, A control means for controlling the rotation of the motor; a rotation speed detection means for detecting the rotation speed of the motor or the rotating drum; and a current detection means for detecting a current flowing through the motor. In the dehydrating operation after each washing and / or rinsing process, the rotation speed detection means and the current detection are performed when the rotation drum is raised to a first predetermined rotation speed for determining the cloth balance from a substantially stationary state. detecting the amount of laundry contained in the rotary drum based on a signal from the means, in the first predetermined rotational speed is determined of the fabric balance good In the drum type washing machine controls to rotate the rotary drum if it is constant in the dehydration rotation speed, the rotation speed of the motor or the rotary drum when the input current value detected by said current detecting means is stable, If the rotation speed is lower than the second predetermined rotation speed that is lower than the first predetermined rotation speed, it is determined that the laundry is stuck in the rotating drum and the amount of the laundry is regarded as a small amount, and the cloth balance is determined. This is a correction so that it is easy to determine that the fabric balance is good, even if the amount of laundry in a dry state cannot be detected, including partial driving conditions such as dehydration only. , washing and rinsing the laundry can determine if a small amount in the dehydration operation performed after each stroke of the correction determination value at the time of determination fabric balanced so fabric balance is easily determined as good Runode, without performing a special operation for detecting the amount of laundry, the laundry be a small amount, also no longer be repeated many times cloth balance determination from launching the first predetermined rotational speed , it can be performed smoothly dehydration operation.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
The drum type washing machine in the 1st Embodiment of this invention is demonstrated using FIGS.

  FIG. 1 is a schematic cross-sectional view of a drum type washing machine in the present embodiment. A water tank 3 is elastically supported by a suspension structure (not shown) in a washing machine housing 9 of the drum type washing machine. Is formed in a bottomed cylindrical shape, and the rotating drum 1 having a large number of through holes 2 on the peripheral wall has an opening 8 side on the front side of the washing machine casing 9 and a bottom side on the back side of the washing machine casing 9. Thus, the rotation axis direction is inclined in the downward direction from the front side toward the back side, and is arranged in the water tank 3 and is rotationally driven by the 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. In addition, 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 rotary drum 1 is disposed at an inclination as in the above configuration, the work for putting in and out the laundry is facilitated, and the water supplied into the rotary drum 1 accumulates 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 switched to give all the laundry evenly washing and dehydrating action. However, it is difficult to obtain a state in which the laundry is evenly stuck to the inner peripheral wall of the rotating drum 1.

  In order to solve this problem, in the present 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 motor 5 are controlled. This is an efficient way of changing the position of an object.

  The stirring 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.

  In the present embodiment, the rotation shaft 4 is provided in a substantially inclined direction at the rotation center of the rotary drum 1 and the axial center direction of the rotary drum 1 is inclined downward from the front side to the back side. However, the rotating shaft 4 may be provided in the substantially horizontal direction at the center of rotation of the rotating drum 1 and the axial center direction of the rotating drum 1 may be disposed in the substantially horizontal direction.

  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 can control the operation of the motor 5, the water supply valve 12 and the drain valve 11. It is configured. An input setting means 17 and a display means 18 are provided on the surface of the washing machine casing 9, and when a selection of a driving course is input from the input setting means 17, the selection state and the driving state are displayed on the display means 18, The control means 16 controls the motor 5, the water supply valve 12, and the drain valve 11 according to the operation procedure according to the control 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.

  The door body 7 is opened, the laundry is put into the rotating drum 1, the detergent is put in from a detergent inlet (not shown) provided in the water supply section 15, and the power on button 17f is operated from the operation panel 35 shown in FIG. Press to turn on the power, select the driving course corresponding to the type of laundry from the course selection button 17d, and press the start / pause button 17e to start the driving operation, the driving control by the control means 16 is started. . As shown in FIG. 4, the operation of the drum type washing machine is basically executed in the order of a washing process, a rinsing process, and a dewatering process, and if a drying function is provided, it is optionally dried after the dewatering process. The process can be carried out.

  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 in the rotary drum 1 in a dry state. . The motor 5 driven and controlled by the drive circuit 22 rotates the rotary drum 1 to detect the amount of laundry from the load state received by the motor 5 corresponding to the amount of laundry.

  That is, the motor 5 is composed of a direct current brushless motor, and as shown in FIG. 2, the drive circuit 22 is an inverter that controls energization to the three-phase windings 5a, 5b, 5c constituting the stator (not shown) of the motor 5. 23 switching control of 23 switching elements 23a-23f is carried out. The DC power supplied to the inverter 23 is a DC power 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 motor 5 is substantially proportional to the input current. Therefore, the load detection means 24 detects the input current value from the voltage across the resistor 25 arranged in series with the DC power supply circuit to the inverter 23 by the current detection circuit 26 serving as the current detection means. The means 16 can detect the amount of laundry put into the rotating drum 1 from the current value detected by the load detection means 24. The amount of laundry detected by the control means 16 is stored in a memory (not shown) 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 water supply valve 12 is opened and supplied from a water supply hose (not shown) connected to the water supply section 15. The tap water is supplied into the water tank 3 through the water injection pipe 13 while mixing the detergent supplied to the water supply unit 15. The amount of water supplied into the aquarium 3 is set by the water level in the aquarium 3 corresponding to the amount of laundry detected at the start of operation.

  The level of the washing water supplied into the water tank 3 is detected by a water level detection means 19 connected to the water tank 3 by an air hose (not shown) and detecting the water pressure in the water tank 3, and the control means 16 is a water level detection means 19. 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 washing water supplied into the water tub 3 is absorbed by the laundry accommodated in the rotating drum 1 through the through holes 2 formed in the rotating drum 1, and the water level in the water tub 3 is lowered. Is similarly implemented.

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 motor 5 to the drive circuit 22. The rotary drum 1 is rotated in the forward direction for a predetermined time at a predetermined rotation speed, and then the rotation drive is stopped for a predetermined time.
A first agitation control operation is performed in which the control operation in which the rotation drive is stopped for a predetermined time is stopped for a predetermined time after the rotation drive in the reverse direction for a predetermined time. The predetermined rotational 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 of the laundry is greater 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 and washing action, and by repeating this, a washing action is performed to remove dirt from the laundry that is absorbing water containing detergent.

  Moreover, since only the thing which contacts the stirring protrusion 6 is extracted from the piled laundry, the effect | action which replaces the position of a laundry is made | formed. When the rotational speed of the rotating drum 1 is lower than the predetermined rotational speed, the stirring protrusion 6 cannot lift the laundry. Conversely, when the rotational speed of the rotating drum 1 is higher than the predetermined rotational speed, the centrifugal force Therefore, the lifted laundry does not fall due to its own weight, and remains attached to the inner peripheral surface of the rotating drum 1. 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.

  The action of tapping to lift and drop the laundry is affected by the amount of laundry accommodated in the rotating drum 1, so that 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 accommodated in the rotary drum 1 is detected and stored by the control means 16 as described above, when the amount of laundry is larger than a preset predetermined amount, the control means 16 Controls so as to obtain a rotational speed obtained by reducing the 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 is 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 that in the first agitation control operation, and then the rotation drive is stopped for a predetermined time, and then in the reverse direction. A control operation in which the rotation drive is stopped for a predetermined time after the rotation drive for a predetermined time at the same rotation speed as that in the direction is repeated for a predetermined 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.

  The control operation for alternately executing the first and second stirring control operations is continued for a required time, so that the laundry is repositioned back and forth in the rotary drum 1 and at the same time, the beating wash having different behavior Even with the rotary drum 1 arranged in an inclined manner, it is possible to give an even cleaning force 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 to open the drain valve 11 to the load driving means 20, so that dirty washing water in the water tank 3 is drained by the drain grooves 14 and the drain pipe 10. It is discharged to the outside through. Furthermore, since the control means 16 rotates the 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 in which tap water is newly supplied into the water tank 3. Even during the rinsing process, the rotating drum 1 is rotated in the forward and reverse directions and is rotated, and the first agitation control operation and / or the second agitation control operation in the above-described washing process is performed. 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.

  FIG. 4 shows a standard operation content when the number of times of rinsing is selected twice. After the washing process, two rinsing processes are performed, and finally a dehydration process is performed. Even in the rinsing process, FIG. A rinsing operation is performed after the dehydrating operation. That is, the dehydrating operation is executed three times as the dehydrating operation in which the rotating drum 1 is rotated at a high speed after draining and dehydrated from the laundry in the first and second rinsing steps and in the dehydrating step.

  In order to reliably perform the dehydrating operation in each stroke, the laundry is evenly attached to the inner peripheral wall of the rotating 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 control procedure of the dehydration operation will be described.

  FIG. 5 shows a 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 added in the text.

  In FIG. 5, when the dehydrating operation is started, the number of repetitions of determination is initialized (N = 1) (S1), and then the first predetermined rotational speed (for example, 90 r / min) for determining the cloth balance is reached. 6A, the initial rotational speed is increased to 40 r / min at time t1 as shown in FIG. 6A (S2), and the rotational speed is maintained for a predetermined time (t1 to t2). At t2 to t3), the speed is increased to the first predetermined rotation speed (S3).

  In this way, by rotating the rotating drum 1 for a predetermined time at an initial rotation speed of 40 r / min, the laundry has an action of rolling in the rotating drum 1 so that the laundry is easily diffused. When the rotational speed rises to the first predetermined rotational speed, it is easily distributed and distributed on the inner peripheral wall of the rotating drum 1.

  The control means 16 makes a small amount determination until the rotational speed of the rotary drum 1 reaches the first predetermined rotational speed (S5). However, if the small amount has already been determined, the small amount is not further determined (S4).

  Here, when the amount of the laundry is relatively small, the laundry is distributed along the inner peripheral wall of the rotary drum 1 and the distance from the rotation center axis is increased, so that the rotational speed of the rotary drum 1 gradually increases. Sometimes, the rotational speed at which the centrifugal force acting on the laundry overcomes gravity and sticks in the rotary drum 1 becomes relatively low.

On the other hand, when the amount of laundry is relatively large, the laundry is distributed in the rotary drum 1 as a whole, and there are laundry that is far from the center axis of rotation and laundry that is close to the rotary drum 1. When the rotational speed gradually increases, the laundry gradually sticks out from the laundry at the outer peripheral portion in the rotary drum 1, and the rotational speed at which the entire laundry sticks becomes relatively high.

  Further, when the laundry in the rotating drum 1 is in a stirring state without sticking to the inner wall, the torque required for the motor 5 is large at the timing of lifting the laundry, and small at the timing of the laundry falling. The torque fluctuation becomes large. On the contrary, when the laundry in the rotating drum 1 is stuck to the inner wall, the torque required for the motor 5 is stably reduced.

  When the laundry is a small amount such as several sheets at the beginning of the dehydrating operation, the torque required for the motor 5 is proportional to the current flowing through the motor 5, as shown in FIG. After a large current flows at the start-up, the laundry converges while vibrating until the time tx when the laundry sticks in the rotating drum 1. In the case of a small amount, it sticks into the rotating drum 1 when it reaches a relatively low rotational speed, for example, 60 r / min.

  In addition, when there is a lot of laundry, as shown in FIG. 6C, after a large current flows at the start-up, the laundry converges while vibrating until the time ty when the laundry sticks in the rotating drum 1. When there is a lot of laundry, it sticks in the rotating drum 1 when it reaches a higher rotational speed, for example 80 r / min, than when it is a small amount.

  The control means 16 inputs the signal from the load detection means 24 and increases the current flowing through the motor 5 when raising the rotary drum 1 to the first predetermined rotational speed (90 r / min) in order to determine the cloth balance. If the rotation speed of the rotating drum 1 when the current is detected is equal to or lower than a second predetermined rotation speed (for example, 65 r / min), it is determined that the amount is small.

  After raising the motor 5 to the first predetermined rotation speed, the cloth balance is determined (S6). If the laundry is evenly adhered to the inner peripheral wall of the rotating drum 1, the rotating drum 1 rotates normally without uneven rotation, so that it is determined that the balance is good in the determination of the cloth balance. The laundry can be dehydrated by executing a dehydration step (S7) in which 5 is rotated at a high speed at a predetermined dehydration rotation speed (for example, 900 r / min).

  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 (not shown) of the motor 5 formed of a DC brushless motor has an electrical angle of 120 so as to face a permanent magnet (not shown) included in the rotor (not shown). Position detection means 21a, 21b, 21c comprising Hall ICs are provided at intervals of degrees, and when the rotor rotates, the magnetic field of the permanent magnet is detected by the position detection means 21a, 21b, 21c, so that the electrical angle is 120 degrees. Pulses are input to the rotational speed detection means 27 included in the control means 16 at intervals of.

  Based on this pulse input, the control means 16 switches on / off states of the switching elements 23a to 23f and controls the energization to the three-phase windings 5a, 5b, 5c of the stator, so that the three-phase windings 5a, 5b, The rotor is rotated by the magnetic field generated by 5c.

  The switching elements 23a, 23c, and 23e are each controlled by pulse width modulation (PWM), and are configured to control the rotational speed of the rotor by controlling the energization ratio at a predetermined repetition frequency. 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.

Accordingly, the position detecting means 2 is kept in a state where the rotational speed of the rotary drum 1 is maintained at a predetermined rotational speed.
When it is detected that the pulses from 1a, 21b, and 21c are not output at predetermined intervals, the rotating drum 1 is uneven in rotation, that is, the laundry is not firmly attached to the inner peripheral wall and the cloth balance is poor. Can be determined. Therefore, the unbalanced state of the laundry in the rotary drum 1 can be detected by setting the fluctuation range of the rotation speed of the motor 5 as the cloth balance determination value.

  Here, when a small amount is determined in step S5, the fluctuation range of the rotation speed of the motor 5 which is the cloth balance determination value is corrected to a value larger than usual, and the motor 5 is set to a predetermined dewatering rotation speed (for example, , 900 r / min) to facilitate the dehydration step (S7) for high-speed rotation. In the case of a small amount, since the number of laundry items is small, it is difficult to evenly stick it in the rotating drum 1, so that the problem that the cloth balance determination is repeated several times by preventing the cloth balance determination value is prevented. Because. At this time, the determination value of the cloth balance is loosened, but since it is limited to when the amount of laundry is small, vibration and noise do not increase.

  In the cloth balance determination (S6), when it is determined that the rotating drum 1 is uneven in rotation, that is, the laundry is biased, the control means 16 stops the rotation of the rotating drum 1 (S8). It is determined whether or not the number of determination repetitions N has reached a predetermined number (for example, N = 8) (S9). If it has not reached the predetermined number, 1 is added to the determination repetition number N (S13), and step S2 Return to the procedure from and start up again.

  On the other hand, in the determination of the number of repetitions N (S9), when the number of repetitions N reaches a predetermined number, the state of the laundry is not improved by repeating the start-up operation, that is, there is a complicated entanglement in the laundry. Since it is determined that the state is present, the user is informed of an abnormality by anomaly notification such as an electronic sound or voice synthesis, etc., and the user is informed of the abnormality so as to eliminate the tangling of the laundry (S10).

  Although not shown at this time, it can be determined by the opening and closing of the door body 7 that the user has taken a measure to eliminate the tangling of the laundry (S11), so that it is repeated when the opening and closing of the door body 7 is detected. The number of times N is initialized (N = 1) (S12), and the operation returns to the procedure from step S2 to execute the start-up operation again.

  In addition, the determination of the cloth balance during the dehydrating operation is performed as shown in FIG. 4 in each of the washing, rinsing, and dehydrating processes.

  That is, once it is determined that the amount of laundry is small, the control means 16 stores the information in the memory. Therefore, in the determination of the cloth balance in the dewatering operation after the small amount is determined, the allowable range is wide. Thus, the determination value can be corrected so that the dehydration operation can be performed smoothly.

  As described above, the drum type washing machine according to the present invention determines whether or not the amount of laundry is small before starting up to the rotational speed at which the cloth balance determination is performed in the control of the cloth balance determination before the dehydrating operation. When the amount is small, the cloth balance judgment value is corrected so that the cloth balance is easily judged to be good. Even if it cannot be detected, the dehydrating operation can be performed smoothly, and can be applied to various household and commercial dehydrators and washing machines.

Schematic sectional view of the drum type washing machine in the first embodiment of the present invention. Circuit diagram of the drum type washing machine Top view of the operation panel of the drum type washing machine The figure which shows each process from the washing process of the drum type washing machine to the dehydration process The flowchart which shows the control procedure at the time of dehydration of the drum type washing machine (A) The figure explaining the starting operation | movement to the spin-drying | dehydration rotation speed of the drum type washing machine (b) The figure which shows transition of the motor current when there is little laundry at the time of the spin-drying | dehydration process of the drum type washing machine (c) Diagram showing the transition of motor current when there is a lot of laundry Schematic sectional view of a conventional drum-type washing machine

DESCRIPTION OF SYMBOLS 1 Rotating drum 3 Water tank 5 Motor 9 Washing machine housing | casing 16 Control means 26 Current detection circuit (current detection means)

Claims (1)

A rotating drum having a rotation axis that is substantially horizontal or inclined, a water tank that is elastically supported in a washing machine housing and encloses the rotating drum, a motor that rotationally drives the rotating drum, and a rotation control of the motor Control means , rotation speed detection means for detecting the rotation speed of the motor or the rotary drum, and current detection means for detecting the current flowing through the motor. Alternatively, in the dehydrating operation after each rinsing process, when the rotary drum is raised from a substantially stationary state to a first predetermined rotational speed for determining the cloth balance , based on signals from the rotational speed detecting means and the current detecting means. If the amount of laundry stored in the rotating drum is detected and the cloth balance is determined to be good at the first predetermined rotational speed, the previous In the drum type washing machine controls to rotate the rotating drum in the dehydration rotation speed, the rotation speed of the motor or the rotary drum when the input current value detected by said current detecting means is stable, the first predetermined If the rotation speed is lower than the second predetermined rotation speed that is lower than the rotation speed, it is determined that the laundry is stuck in the rotating drum and the amount of the laundry is regarded as a small amount. A drum-type washing machine that makes corrections so that it is easy to determine that the fabric balance is good .

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