JP2018102646A - Drum type washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drum type washing machine capable of effectively avoiding delay of washing time by smoothly performing a dewatering step.SOLUTION: In a dewatering step, when an eccentricity amount (M) is larger than a threshold value β for large-sized laundry, a drum type washing machine 1 determines that this is caused by there being large-sized laundry in a drum 2, and performs control for reducing the eccentricity amount. In the case where the eccentricity amount (M) does not become below the threshold value β for large-sized laundry even after performing control for reducing the eccentricity amount (M) once or for a plurality of times, the washing machine allows the drum 2 to rotate at rotational frequency for large-sized laundry which is lower than predetermined normal rotational frequency set in the dewatering step.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a drum type washing machine having a washing function.

  Some drum-type washing machines installed in a general household or a coin laundry have a washing and dehydrating function and a washing and dehydrating and drying function.

  A drum-type washing machine having a dewatering function generates vibrations and noises due to the unevenness of the laundry in the drum. Also, if the laundry is biased, the amount of eccentricity of the drum during rotation increases, and a large torque is required for rotation, so that the dehydration operation cannot be started.

  Here, in the drum type washing machine of Patent Document 1, when it is determined that the amount of eccentricity, which is the bias of the laundry, is larger than a predetermined value, the centrifugal force becomes smaller than gravity according to the output timing of the position detection means. The drum is decelerated until the rotational speed is reached, so that the uneven distribution of the laundry is eliminated, that is, the eccentric amount of the drum is reduced.

  In particular, laundry items that are large among clothing items and laundry items such as blankets and sheets that are treated as bedding are recognized as large clothing items.

  When such large clothing is arranged at a position offset in the drum, the eccentric amount of the drum is usually large.

Japanese Patent No. 3332769

  However, in the current drum type washing machine including the one described in Patent Document 1, even if the drum is eccentric due to the large clothing, it cannot be detected separately from the eccentricity of the normal laundry.

  On the other hand, even if the amount of eccentricity of the drum increases due to large clothing, if it takes time to control the eccentricity, that is, the dehydration process takes longer, resulting in a longer operating time. Invite the problem of lengthening.

  The present invention solves the above-described problems. According to the present invention, it is possible not only to accurately detect the uneven distribution of the laundry in the washing tub, but also to reliably detect the eccentric amount of the drum in a wide rotation range during the dehydration process, and to perform the dehydration process without delay. It is possible to provide a drum-type washing machine capable of shortening the length.

  The present invention includes a bottomed cylindrical drum configured to be rotatable around an axis extending in a horizontal direction or an inclination direction, and an eccentricity detecting means for detecting an eccentricity amount and an eccentric position in the drum. A drum-type washing machine that performs control to reduce the amount of eccentricity when the amount of eccentricity in the drum exceeds a predetermined threshold value, wherein the amount of eccentricity is larger than the threshold value for large laundry in the dehydration process Sometimes it is determined that there is a large laundry in the drum and control is performed to reduce the amount of eccentricity, and even if the control to reduce the amount of eccentricity is performed once or multiple times, the amount of eccentricity is If it does not fall below the laundry threshold, the drum is rotated at a large laundry rotation speed lower than a predetermined steady rotation speed set in the dewatering step.

  Further, according to the present invention, if the eccentric amount does not fall below the large laundry threshold even if the control for reducing the eccentric amount is performed a plurality of times, the predetermined steady rotation set in the dehydration step is performed. The dehydration process is terminated at a rotation speed for washing large items lower than the number.

  Further, in the present invention, the control for reducing the amount of eccentricity is performed by rotating the drum at a control rotational speed lower than the detected rotational speed, and then rotating the drum to a brake rotational speed at which centrifugal force becomes smaller than gravity. It is characterized by brake control that reduces the number.

  Further, the invention is characterized in that the control for reducing the amount of eccentricity is stop control for stopping rotation of the drum and then rotating the drum again.

  Further, in the present invention, a plurality of threshold values for large laundry items are set in accordance with an eccentric amount, and the dehydration step is terminated at a rotation speed for large laundry items that is different for each threshold value for large laundry items. It is characterized by.

  According to the present invention, the eccentricity detecting means includes an acceleration sensor that detects vibration of the drum, a drum position detection device that transmits a pulse signal in accordance with the rotation of the drum, and the drum detected by the acceleration sensor. In the information indicating the time variation of the acceleration during at least one rotation of the drum, the amount of eccentricity and the eccentric position in the drum are detected based on vibration and a pulse signal transmitted from the drum position detection device. A time difference between an arbitrary time point and the pulse signal is calculated, and an eccentric position in the drum is calculated from a relationship between the time difference and the rotation speed of the drum.

  Further, the present invention is characterized in that the eccentricity detecting means detects an eccentric position and an eccentricity amount by a motor control device that controls a motor that drives the drum.

  According to the present invention, it is reliably detected that the eccentric amount of the drum cannot be reliably reduced by the control, and the washing time is delayed by performing the dehydration process without delay even in this situation. A drum type washing machine that can be effectively avoided can be provided.

  The drum type washing machine of the present invention can perform a quicker dewatering process by performing the same dewatering process as usual when the eccentricity is reduced by the control for reducing the eccentricity.

  The drum type washing machine of the present invention can realize a rapid reduction of the eccentricity amount by performing brake control as a control for reducing the eccentricity amount.

  The drum type washing machine of the present invention can more reliably reduce the amount of eccentricity by performing stop control that reliably stops the rotation of the drum once.

  In the drum-type washing machine of the present invention, the dehydration process is terminated at a rotation speed for large-sized laundry that is different for each threshold value for large-sized laundry. It can be effectively avoided.

  The drum type washing machine of the present invention detects the eccentricity of the laundry from the torque applied to the motor through the motor control device used in the conventional washing machine by detecting the bias of the laundry by the acceleration sensor. Compared to a mode in which the amount of eccentricity is mechanically detected by the behavior of a micro switch arranged in the vicinity of the washing tub, the eccentric position and the amount of eccentricity in the drum are accurately detected even in a higher and wider rotation range. be able to. Thereby, since eccentricity is eliminated quickly, it is possible to shorten the operating time of the washing machine by avoiding a prolonged dehydration process.

  The drum type washing machine of the present invention can be easily applied to various existing washing machines by detecting the bias of the laundry without using an acceleration sensor.

It is a typical sectional view of washing machine 1 concerning one embodiment of the present invention. 2 is an electric block diagram of the washing machine 1. FIG. It is a graph which shows the detected value of the acceleration sensor 12 and the proximity sensor 14 of the washing machine 1. It is a flowchart which shows the flow of control of the dehydration process in the embodiment.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic cross-sectional view showing the configuration of the washing machine 1 of the present embodiment. FIG. 2 is a functional block diagram showing an electrical configuration of the washing machine 1 of the present embodiment.

  The washing machine 1 of the present embodiment can be suitably used in, for example, a coin laundry or home, and includes a washing machine body 1a, an outer tub 3 having an axis S1 extending substantially horizontally, and a drum 2. This is a so-called drum type washing machine including the washing tub 1b, the driving device 40, and the control unit 30 shown only in FIG.

  The washing machine main body 1a shown in FIG. 1 has a substantially rectangular parallelepiped shape. The front surface 10a of the washing machine main body 1a is formed with an opening 11 for putting laundry into and out of the drum 2, and an opening / closing lid (not shown) capable of opening and closing the opening 11 is attached. The washing machine 1 according to the present embodiment is called a drum-type fully automatic washing machine in which a washing tub 1b is attached in a substantially horizontal direction.

  The outer tub 3 is a bottomed cylindrical member disposed inside the washing machine body 1a, and can store washing water therein. As shown in FIG. 1, an acceleration sensor 12 capable of detecting acceleration in three directions, for example, a left-right direction, a vertical direction, and a front-back direction, is attached to the outer peripheral surface 3 a of the outer tub 3. In the present embodiment, as an example, the acceleration sensor 12 is a triaxial sensor that can detect acceleration in the left-right direction, the up-down direction, and the front-rear direction. The outer tub 3 is connected to a discharge path 3b through which washing water can be discharged to the outside. The discharge passage 3b is provided with a discharge valve 32 that can be opened and closed.

  The drum 2 is a bottomed cylindrical member that is disposed coaxially with the outer tub 3 in the outer tub 3 and is rotatably supported. The drum 2 can store laundry therein and has a large number of water holes on its wall surface.

  As shown in FIG. 1, the driving device 40 rotates the pulleys 15, 15 and the belt 15 b by the motor 10 and rotates the driving shaft 17 extending toward the bottom 2 c of the drum 2 to drive the drum 2. Applying force, the drum 2 is rotated. Further, a proximity switch 14 that can detect the passage of the mark 15 a formed on the pulley 15 is provided in the vicinity of one pulley 15. In the present embodiment, the proximity switch 14 corresponds to a drum position detection device.

  In the present embodiment, a motor control circuit 34 that is also called a drum inverter connected to the motor 10 is provided as a component of the driving device 40.

  FIG. 2 is a block diagram showing an electrical configuration of the washing machine 1 of the present embodiment. The operation of the washing machine 1 is controlled by a control unit 30 including a microcomputer. The control unit 30 includes a central control unit (CPU) 31 that controls the entire system, and the control unit 30 includes a control threshold value (α), a big game count BC, A memory (not shown) in which the eccentric amount threshold (β), the drum stop count DS, the first large threshold (γ1), the second large threshold (γ2), and the third large threshold (γ3) are stored is connected. The control unit 30 causes the microcomputer to execute a program stored in the memory, so that a predetermined operation is performed, and data used when the program is executed is temporarily stored in the memory. Memorized.

  The central control unit 31 outputs a control signal to the rotation speed control unit 33 and further outputs the control signal to a motor control circuit (drum inverter) 34 to control the rotation of the motor 10. The rotation speed control unit 33 receives a signal indicating the rotation speed of the motor 10 from the motor control circuit 34 in real time, and serves as a control element.

  The acceleration sensor 12 is connected to the unbalance amount detection unit 35. The unbalanced position detector 36 is connected to the acceleration sensor 12 and the proximity switch 14. The unbalance amount detection unit 35 and the unbalance position detection unit 36 constitute an eccentricity detection means. In the present embodiment, the aspect in which the unbalance amount detection unit 35 and the unbalance position detection unit 36 are connected to the motor control circuit 34 is not denied. The method of detecting the eccentric position and eccentricity (M) of the drum 2 by the motor control circuit 34 is to calculate the eccentric position from the fluctuation of the torque applied to the motor 10 and the detected value from the proximity switch 14. is there. Since the detection method of the eccentric position and eccentricity (M) by the motor control circuit 34 can use an existing method, detailed description is omitted in this embodiment.

  When the proximity switch 14 detects the marker 15a (see FIG. 1), the unbalance amount detection unit 35 determines the bias of the drum 2 from the magnitudes of acceleration in the horizontal direction, vertical direction, and front-rear direction obtained from the acceleration sensor 12. The center amount (M) is calculated, and this eccentric amount (M) is output to the central control unit 31.

  The unbalance position detection unit 36 calculates the eccentric position from the signal indicating the position of the marker 15 a input from the proximity switch 14, and outputs it to the central control unit 31. Here, the eccentric position is a relative angle with respect to any location in the circumferential direction of the axis S1.

  Subsequently, specific aspects of the control method according to the present embodiment will be further described.

  A procedure for calculating the eccentric position in the present embodiment will be described. In the present embodiment, in the dehydration step, a time difference t1 between an arbitrary time point in the signal related to the acceleration indicating at least one cycle t2 of the drum 2 transmitted from the acceleration sensor 12 and the timing at which the pulse signal ps is transmitted from the proximity switch 14. Is calculated and compared with the relationship between the signal of the eccentric position / acceleration sensor 12 and the pulse signal ps of the proximity switch 14 as prior information, and the circumferential direction in the drum 2 from the relationship between the time difference t1 and the rotation speed of the drum 2. The eccentric position is calculated, and control for reducing the eccentric amount (M) is performed based on the calculated eccentric position. In the following, a specific procedure for calculating the eccentric position according to the present embodiment will be described. Since the eccentric amount (M) is expressed in proportion to the amplitude amount of the signal transmitted from the acceleration sensor 12, the amplitude amount is shown as the eccentric amount (M) in FIG.

  FIG. 3 is a graph showing the relationship between the information indicating the time change of the acceleration calculated based on the acceleration obtained from the acceleration sensor 12 and the pulse signal ps obtained from the proximity switch 14. In FIG. 3, for the sake of convenience, the eccentric position is calculated from the time difference t1 between the maximum value (max) of acceleration obtained from the acceleration sensor 12 and the pulse signal ps. In the present embodiment shown in FIG. 3, as an example, a mode in which the eccentric position is calculated from the maximum value (max) and the minimum value (min) of the acceleration is shown. However, as another example of the present invention, the zero acceleration point is shown. The eccentric position may be calculated from one or a plurality of acceleration maximum values (max) and minimum values (min).

  That is, the eccentric position is calculated from the relative value of the time difference t1 with respect to one period t2 obtained from the pulse signal ps as shown in FIG. As an example, the range of the value of the time difference t1 and each region obtained by dividing the drum 2 in the circumferential direction are associated in advance and stored in the central control unit 31. Then, the region where the eccentric position is located is specified from the obtained t1 value. Further, the association between the time difference t1 and the eccentric position does not disturb the mode of changing according to the rotation speed of the drum 2 or the resonance rotation speed of the drum 2.

  In the present embodiment, when the central control unit 31 receives an input signal from a dehydration button (not shown) or a signal indicating that the dehydration process should be started during the washing course operation, the process proceeds to step ST1 to start the dehydration process.

<Step ST1>
In step ST1, the central control unit 31 performs a process of increasing the rotational speed of the drum 2 to a rotational speed sufficient to calculate the eccentric position and eccentricity (M) of the drum 2. In the present embodiment, when the motor control circuit 34 calculates the eccentric position and the eccentric amount (M) of the drum 2, as an example, the rotational speed of the drum 2 is increased to 100 rpm. Further, when the acceleration sensor 12 calculates the eccentric position and the eccentricity (M) of the drum 2, as an example, the rotational speed of the drum 2 is increased to 200 rpm or more.

<Step ST2>
In step ST2, the central control unit 31 calculates the eccentric position and the eccentric amount (M) of the drum 2, and the eccentric amount (M) cannot be accelerated to the maximum dehydrating rotational speed from the required control threshold value α. It is also determined whether or not the When the eccentricity amount (M) is smaller than the required control threshold value α, the central control unit 31 proceeds to step ST14. When the amount of eccentricity (M) is equal to or greater than the control threshold value α, the central control unit 31 proceeds to step ST3.

<Step ST3>
In step ST3, the central control unit 31 determines whether or not the eccentricity amount (M) has exceeded the large object threshold value β, which is a value larger than the control required threshold value α, up to five times. The central control unit 31 proceeds to step ST4 if the big game count BC, which is the number of times that the eccentricity (M) exceeds the big game control threshold β, has not reached 5. If the big game count BC has reached 5, the central control unit 31 proceeds to step ST10.

<Step ST4>
In step ST4, the central control unit 31 determines whether or not the eccentricity amount (M) is smaller than the large object control threshold value β. When the eccentricity amount (M) is smaller than the large object control threshold value β, the central control unit 31 proceeds to step ST7. If the amount of eccentricity (M) is greater than or equal to the large object control threshold value β, the central control unit 31 proceeds to step ST5. That is, in step ST5, the central control unit 31 determines that there is a large laundry in the drum 2 because the eccentricity (M) is larger than the large laundry threshold β.

<Step ST5>
In step ST5, the central control unit 31 adds 1 to the big game count.

<Step ST6>
In step ST6, the central control unit 31 proceeds to step ST8 if the big game count BC, which is the number of times the eccentricity (M) exceeds the big control threshold β, has not reached 5. If the big game count BC has reached 5, the central control unit 31 proceeds to step ST10.

<Step ST7>
In step ST7, the central control unit 31 resets the big game count number to zero. The central control unit 31 resets the big game count number BC to 0, and then proceeds to step ST8.

<Step ST8>
In step ST <b> 8, the central control unit 31 determines whether or not the eccentric position calculated in step ST <b> 2 is positioned at the top of the drum 2. The central control unit 31 proceeds to step ST9 when the eccentric position is at a timing at which the eccentric position is positioned on the upper portion of the drum 2.

<Step ST9>
In step ST9, the central control unit 31 performs so-called brake control that reduces the rotational speed of the drum 2 to, for example, about 100 rpm, and further reduces the rotational speed of the drum to a brake rotational speed at which the centrifugal force is smaller than gravity. To do. After performing the brake control, the central control unit 31 proceeds to step ST1. That is, in step ST9, as control for reducing the eccentricity (M), the drum 2 is rotated at a control rotational speed of about 200 rpm or about 100 rpm, which is the detected rotational speed, and thereafter the brake in which the centrifugal force becomes smaller than gravity. Brake control is performed to reduce the drum rotation speed to the rotation speed.

<Step ST10>
In step ST10, the central control unit 31 determines whether or not the number of times after passing through step ST12 described later, in other words, the number of drum stop times DS in which the rotation of the drum 2 is stopped is three. If the number of drum stops DS has not reached 3, the process proceeds to step ST11. If the drum stop count DS is 3, the process proceeds to step ST13.

<Step ST11>
In step ST11, the central control unit 31 adds 1 to the drum stop count DS.

<Step ST12>
In step ST12, the central control unit 31 stops the rotation of the drum 2 so as to change the eccentric position of the drum 2. Thereafter, the central control unit 31 proceeds to step ST1. That is, the control for increasing the rotational speed of the drum 2 again by executing the step ST1 after stopping the rotation of the drum 2 in the step ST12 is to reduce the eccentricity (M) according to the present embodiment. This corresponds to the stop control.

<Step ST13>
In step ST13, the central control unit 31 avoids the eccentric amount (M) of the drum 2 from reaching a predetermined maximum dewatering rotation speed until the low-speed dewatering rotation speed is lower than the maximum dewatering rotation speed. The rotational speed of the drum 2 is increased. In the present embodiment, the maximum dehydration rotational speed is set to 800 rpm as an example. The central control unit 31 increases the number of rotations of the drum 2 to the low-speed dewatering number of rotations, and then proceeds to the position illustrated in FIG.

  Here, in this embodiment, the low-speed dewatering rotation speed can be set to three rotation speeds according to the eccentric amount (M) of the drum 2. Then, as described above, the central control unit 31 includes the first large-value threshold (γ1), the second large-value threshold (γ2), the third large-size eccentric amount threshold (β), and the low-speed dehydration rotational speed to be determined. The big shot threshold (γ3) is stored in a memory (not shown).

Specifically, in the present embodiment, as an example, a large-size eccentric amount threshold (β), a first large-value threshold (γ1), a second large-value threshold (γ2), The relationship with the three major thresholds (γ3) is β = γ1 <γ2 <γ3
Is set to hold.

  When the rotation speed of the drum 2 is larger than the first big thing threshold value (γ1) and less than or equal to the second big thing threshold value (γ2), the central control unit 31 sets the low speed dewatering revolution number to 600 rpm as an example.

  When the rotation speed of the drum 2 is larger than the second large-size threshold value (γ2) and equal to or smaller than the third large-size threshold value (γ3), the central control unit 31 sets the low-speed dewatering rotation speed to 400 rpm as an example.

  When the rotation speed of the drum 2 is larger than the third large object threshold value (γ3), the central control unit 31 sets the low-speed dewatering rotation speed to 200 rpm as an example.

<Step ST14>
In step ST14, the central control unit 31 determines that the dehydration process can proceed smoothly since the eccentric amount (M) of the drum 2 detected in step ST2 is smaller than the control threshold value α. The rotational speed is accelerated to 800 rpm which is the maximum dehydrating rotational speed in this embodiment.

<Step ST15>
In step ST15, the central control unit 31 determines whether or not the elapsed time since the start of the dehydration process has passed a predetermined dehydration time. The central control unit 31 ends the process of the dehydration step when a predetermined dehydration time has elapsed since the start of the dehydration step.

  The rotation speed of the drum 2 in step ST15 is 800 rpm, which is the maximum dehydration rotation speed in the present embodiment, from step ST2 through step ST14 to step ST15. On the other hand, the rotation speed of the drum 2 is the above-described low-speed dewatering rotation speed when the process proceeds from step ST13 to step ST15. As described above, the low-speed dewatering rotation speed is 600 rpm, 400 rpm, or 200 rpm depending on the eccentric amount (M) of the drum 2.

  That is, the eccentricity (M) does not fall below the large laundry threshold even when the brake control or stop for reducing the eccentricity (M) is performed a plurality of times when the process reaches step ST15 at the low-speed dewatering rotation speed. It means that you have gone through the course. In the present embodiment, a plurality of threshold values set in accordance with the eccentricity (M), the first big thing threshold value (γ1), the second big thing threshold value (γ2), and the third big thing threshold value (γ3), respectively. The dehydration process is terminated by a rotation speed for washing large items which is a different low-speed dewatering speed.

  As described above, the washing machine 1 according to the present embodiment reliably detects that the eccentric amount (M) of the drum 2 cannot be reliably reduced by the control, and dewaters even in this situation. By performing the process without delay, it has been realized to effectively avoid a delay in washing time.

  In the present embodiment, the brake control at step ST9 is performed, so that the amount of eccentricity (M) can be quickly reduced.

  In the present embodiment, the amount of eccentricity can be more reliably reduced by performing stop control from step ST12 to step ST1.

  In the present embodiment, when executing step ST13, the rotation speed for large laundry, which is different for each of the first large threshold (γ1), the second large threshold (γ2), and the third large threshold (γ3), which is a large laundry threshold, Since the low-speed dehydration rotation speed is applied and the dehydration process is terminated, the prolonged dehydration process is effectively avoided regardless of the state of the laundry in the drum 2.

  Although one embodiment of the present invention has been described above, the specific configuration of each part is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

  For example, in the above embodiment, the present invention is applied to a washing machine of a type in which the drum is opened in the horizontal direction, but of course, an inclined drum type washing machine in which the drum is opened obliquely upward and a drying function are also provided. The present invention may be applied to a laundry dryer. Moreover, although only the aspect which detects the eccentric position and eccentricity amount with an acceleration sensor was disclosed in the said embodiment, the aspect using the motor control circuit conventionally applied without using the said acceleration sensor, and an eccentric position are machine. It does not deny a mode of replacing or using in combination with a mode of using a microswitch to detect automatically. Further, various details such as a specific aspect of the acceleration sensor and a specific calculation method of the eccentric position can be variously modified without departing from the gist of the present invention.

1 ... Drum-type washing machine (washing machine)
1b ... washing tub 12 ... acceleration sensor 14 ... drum position detection device (proximity sensor)
2 ... Drum 35 ... Eccentricity detection means (unbalance amount detection unit)
36... Eccentricity detection means (unbalance position detection unit)
β ・ ・ ・ Threshold for large laundry γ1 ・ ・ ・ Threshold for large laundry (first large item threshold)
γ2 ... Large laundry threshold (second large threshold)
γ3 ... Large laundry threshold (third largest threshold)
M: Eccentricity ST9: Control to reduce the eccentricity (stop control)
ST12 ... Control to reduce eccentricity (brake control)
t1 Time difference ps Pulse signal

Claims (7)

A bottomed cylindrical drum configured to be rotatable about an axis extending in a horizontal direction or an inclined direction;
An eccentricity detecting means for detecting an eccentricity amount and an eccentric position in the drum,
A drum-type washing machine that performs control to reduce the amount of eccentricity when the amount of eccentricity in the drum exceeds a predetermined threshold,
In the dehydration process,
When the amount of eccentricity is larger than the threshold for large laundry, it is determined that there is a large laundry in the drum, and control is performed to reduce the amount of eccentricity,
If the amount of eccentricity does not fall below the large laundry threshold even if the control for reducing the amount of eccentricity is performed once or a plurality of times, from the predetermined steady rotation speed set in the dehydration step A drum-type washing machine, characterized in that the drum is rotated at a lower rotation speed for washing large items.   If the amount of eccentricity does not fall below the large laundry threshold even if the control for reducing the amount of eccentricity is performed a plurality of times, a large item lower than the predetermined steady-state rotational speed set in the dewatering step 2. The drum type washing machine according to claim 1, wherein the dehydration step is terminated at the washing rotational speed.   The control for reducing the amount of eccentricity is a brake in which the drum is rotated at a rotational speed for control that is near the rotational speed at which centrifugal force and gravity are balanced and at a high rotational speed, and thereafter the centrifugal force becomes smaller than gravity. 2. The drum type washing machine according to claim 1, wherein the brake control is a brake control for reducing the rotational speed of the drum to the rotational speed.   The drum type washing machine according to claim 1, wherein the control for reducing the eccentricity is a stop control for stopping rotation of the drum and then rotating the drum again.   A plurality of thresholds for large laundry items are set according to the amount of eccentricity, and the dehydration process is terminated at a rotation speed for large laundry items that differs for each threshold value for large laundry items. Item 2. A drum-type washing machine according to Item 1. The eccentricity detecting means includes an acceleration sensor that detects vibration of the drum, a drum position detection device that transmits a pulse signal according to the rotation of the drum, vibration of the drum detected by the acceleration sensor, and the drum position. Based on the pulse signal transmitted from the detection device, it detects the eccentric amount and the eccentric position in the drum,
The time difference between an arbitrary time point in the information indicating the time change of acceleration during at least one rotation of the drum and the pulse signal is calculated, and the eccentric position in the drum is determined from the relationship between the time difference and the rotation speed of the drum. The drum type washing machine according to claim 1, wherein the drum type washing machine is calculated.   2. The drum type washing machine according to claim 1, wherein the eccentricity detecting means detects an eccentric position and an eccentricity amount by a motor control device that controls a motor for driving the drum.

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