JP2010042185A - Drum type washing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a washing machine which detects imbalance in the rear more simply and quickly, serves for determination and handling of the rear abnormal imbalance and further for execution thereof. <P>SOLUTION: On the conditions that a rotating drum 2 formed in a cylinder with a bottom is installed in a tank 3 which is elastically supported with a pivot 2a going horizontally or sloping down backward and is driven by a motor 5 in the back of the tank 3, a control means 20 determines a rear imbalance based on output signals of multidirectional oscillating components output by an oscillating sensing means 40 in the process of increasing rotation of the rotating drum 2 in dehydration operation. In this case, the rear imbalance is determined and the above purpose is accomplished when an on-peak amplitude of the output signal concerning the oscillating components of the front horizontal direction is higher than a second threshold lower than a first threshold by a predetermined amplitude. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is a water tank in which a rotating drum formed in a bottomed cylindrical shape is elastically supported so that the rotation axis direction is inclined horizontally or downward from the horizontal direction from the opening front side toward the back side as the bottom. The present invention relates to a drum-type washing machine installed inside and driven by a motor fixed to the back of a water tank.

  With reference to FIG. 1 showing the embodiment of the present invention, such a drum type washing machine has a large number of holes in a water tank 3 elastically supported by a vibration isolating damper 70 as a suspension structure in a housing 6. The rotating drum 2 is formed so that the rotating shaft direction is horizontal or inclined downward from the horizontal direction from the front side to the bottom side where the rotating drum 2 is formed, and the rotating drum 4 is disposed on the back of the water tank 3. The water tank unit 7 is configured to be rotationally driven by a fixed motor 5, and the front opening of the water tank 3 and the front opening of the rotary drum 2 are opened by opening a door 9 that can be opened and closed on the front side of the housing 1. The laundry can be taken in and out of the rotary drum 4 through the through.

  In such a drum-type washing machine, since the rotating drum is horizontal or inclined as described above, if laundry is stored in the rotating drum and rotated, the laundry and water tend to be biased downward. Vibration is likely to occur. In particular, when performing a dehydration process in which the rotating drum is rotated at a high speed to dehydrate the laundry, the laundry containing water is stored in the rotating drum after the washing or rinsing process is completed. Depending on the type, dough, or shape, there is a state where the rotating drum tends to gather at a biased position during the spin-drying process. When the laundry is biased, a large vibration is generated in the water tank that houses the rotating drum, and abnormal vibration and abnormal noise are generated in the washing machine.

Patent Document 1 discloses a drum-type washing machine of this type in which the rotational speed of a rotating drum is operated in a dehydration process over a wide rotational speed range from low speed to high speed, and in that case, the laundry is moved in the front-rear direction along the rotational axis. If there is an unbalance, there may be a problem such as a large swinging of the rotating drum depending on the number of rotations, which may cause noise such as collision with the water tank and noise generation. If there is an unbalance, it is said that the swinging is more likely to occur than when there is an unbalance on the rear side. As a technique corresponding to this, Patent Document 1 detects the unbalanced position of the laundry based on the output signal of the vibration component in the plurality of directions output by the vibration detection means capable of detecting the vibration component in the plurality of directions of the water tank. To deal with unbalanced abnormalities.
JP 2006-311884 A

  By the way, with respect to the vibration source of the rotating drum as disclosed in Patent Document 1, the water tank is a resonance target. For this reason, when the water tank resonates at the first and second resonance points, it causes abnormal vibration of the entire water tank unit described above and generates abnormal noise. To solve this problem, it is important to preferentially determine the front imbalance as in the technique described in Patent Document 1 and to deal with it, so that the problem remains, and there is a limit to the rear imbalance.

In particular, the vibration behavior of the rotating drum at the time of unbalance is a so-called flourwood movement in which the front part swings around the back as disclosed in Patent Document 1, regardless of whether the rotation is unbalanced or not. From the disclosed technical point of view, the back side of the rotating drum is small and there is no fear of contact with the aquarium, but it is a heavy-side vibration source with a fixed motor, and greatly vibrates the front side of the aquarium. In addition to this, it may cause resonance different from the previous unbalance with the aquarium, or may cause damage at the mutual joint due to differences in vibration behavior and vibration load with the aquarium.

  An object of the present invention is to provide a drum type washing machine that can easily and quickly detect the subsequent unbalance, quickly determine the subsequent unbalance abnormality, provide a countermeasure for it, and execute it. .

  In order to achieve the above object, a drum-type washing machine according to the present invention is configured such that a rotating drum formed in a bottomed cylindrical shape has a horizontal or horizontal rotation axis direction from an opening front side toward a back side as a bottom. A drum-type washing machine installed in an elastically supported water tank so as to be inclined downward and driven by a motor fixed to the back of the water tank, control means for controlling the rotation of the motor, and the water tank Vibration control means for detecting vibration components in a plurality of directions at the front portion of the plurality of directions, and the control means outputs the plurality of directions output by the vibration detection means in the process of increasing the rotation in the dehydrating operation after the washing and rinsing steps. Based on the output signal of the vibration component, the amplitude of the output signal related to the vibration component in the front left / right direction that is detected in advance is equal to or higher than a predetermined first reference value that is less than the first threshold value that causes the front unbalance abnormality. If the amplitude increase of the output signal related to the vibration component in the front / rear direction generated after the output signal for a predetermined time from the point of time is greater than or equal to a predetermined second reference value, In the case where it is determined that the rear imbalance is determined and the amplitude at the peak time of the output signal related to the vibration component in the front left / right direction is higher than a second threshold that is a predetermined width lower than the first threshold, It is characterized by determining an unbalance abnormality.

  In such a configuration, the vibration detection means is on the water tank and outputs signals corresponding to vibrations in a plurality of directions including the front left / right direction and the front / rear direction, but the output related to the vibration component in the front / right / left direction. The rate of increase of the output signal related to the vibration component in the front / rear direction before and after the signal is detected during a predetermined time from the peak time point when the signal is detected in advance and the amplitude is equal to or greater than the first reference value. It is possible to determine whether it is rear unbalance or front unbalance by using the correlation between whether it is greater than the reference value or whether it is rear unbalance. When the amplitude of the output signal at the peak time is higher than the second threshold value, which is lower than the first threshold value by a predetermined width, it can be determined that the imbalance is abnormal, and it can be used for dealing with the abnormal case.

  Further objects and features of the present invention will become apparent from the following detailed description and drawings. The features of the present invention can be employed alone or in combination as much as possible.

  According to the present invention, the relationship between the two output signals output by the vibration detecting means is skillfully used, and the vibration component in the front left / right direction is detected prior to the output signal related to the vibration component in the front / rear direction. The rear imbalance is determined based on whether or not the rise of the former output signal is greater than or equal to the second reference value during a predetermined time from when the peak value of the output signal is detected to be greater than or equal to the first reference value. When it is determined that the rear imbalance is present, when the amplitude at the peak time of the output signal related to the vibration component in the front left / right direction is higher than a second threshold that is a predetermined width lower than the first threshold, Since it is determined, it can be achieved easily and quickly, and can be used for dealing with those abnormalities.

Hereinafter, a drum type washing machine according to an embodiment of the present invention will be described with reference to FIGS. 1 to 8 for the understanding of the present invention. In addition, the following description is a specific example of this invention, Comprising: The content of description of a claim is not limited.

(Embodiment)
The drum type washing machine 1 according to the present embodiment shown in FIG. 1 houses a water tank unit 7 in a washing machine casing 6. The water tank unit 7 accommodates the rotating drum 2 in the water tank 3, and the rotating shaft 2a of the rotating drum 2 is supported by a bearing 68 provided on the back surface of the water tank 3, and the drum driving motor 5 is supported on the rotating shaft 2a by a bearing 68. Linked above. The rotating drum 2 is disposed together with the water tank 3 such that the direction of the rotating shaft 2a is inclined downward from the horizontal or horizontal direction from the front side to the back side to the bottom side. Since the water tank unit 7 has heavy components such as the bearing 68 and the motor 5 attached to the back side thereof, the position of the center of gravity G becomes closer to the back side and becomes unstable. Therefore, the water tank unit 7 is supported by the vibration damping damper 70 below the position of the center of gravity G and closer to the front side, and between the upper support fitting 75 fixed to the upper part of the tank 3 and the upper surface of the washing machine casing 6. The water tank unit 7 is urged toward the front side by the first coil spring 71 installed on the front side, and further between the back surface below the support height position by the vibration damping damper 70 and the back surface of the washing machine housing 6. By installing the second coil spring 72, it is corrected that the aquarium unit 7 supported by the vibration isolating damper 70 nearer to the front side than the position of the center of gravity G falls to the back side, and a support structure having a high damping effect. It is configured.

  The drum type washing machine 1 of the present embodiment is not shown in the drawing, but the drum type washing machine having a drying function provided with a blower fan for blowing warm air, a heater for generating warm air, etc. in the rotating drum 2. A control means 20 as shown in FIG. 2 is provided to control a series of operation operations including a dryer, washing, rinsing, dewatering, and drying based on an instruction input from the user and an operation state monitoring of each part. Yes.

  The control means 20 rectifies the AC power 31 by the rectifier 32, and uses the DC power smoothed by the smoothing circuit including the choke coil 33 and the smoothing capacitor 34 as the driving power to rotate the motor 5 by the inverter circuit 26. The rotation of the drum drive motor 5 is controlled based on the operation instruction input from the input setting means 21 and the monitoring information of the operation state detected by each detection means, and the water supply valve 14, the drain valve 13, and the air blow are controlled by the load drive means 37. The operation of necessary loads such as the fan 17 and the heaters 18 and 19 is controlled.

  The motor 5 includes a stator having three-phase windings 5a, 5b, and 5c and a rotor having a two-pole permanent magnet, and is configured as a DC brushless motor provided with three position detection elements 24a, 24b, and 24c. The rotation is controlled by a PWM control inverter circuit 26 constituted by the switching elements 26a to 26f. The rotor position detection signals detected by the position detection elements 24a, 24b, and 24c are input to the control means 20, and the on / off states of the switching elements 26a to 26f are PWM-controlled by the drive circuit 25 based on the rotor position detection signals. Thus, energization of the three-phase windings 5a, 5b, and 5c of the stator is controlled to rotate the rotor at a required rotational speed. The control means 20 detects the cycle each time the signal state of any of the three position detection means 24a, 24b, 24c changes, and the rotational speed detection means 24 uses the rotational speed of the rotor as an internal function based on the period. Calculated by

  By the way, as described above, the rotating drum 2 of the water tank unit 7 elastically supported as described above has the direction of the rotating shaft 2a being horizontal or inclined, and when the laundry is stored and rotated, Since water tends to be biased downward, vibration is likely to occur, and in the dehydration process in which the laundry drum is dehydrated by rotating the rotary drum 2 at a high speed of 1000 to 1550 rpm shown in FIG. After completion of the stroke, the laundry containing water is likely to gather at a biased position of the rotary drum 2 depending on the type, fabric or shape. When the laundry is biased, a large vibration is generated in the water tank 3 that accommodates the rotating drum, and abnormal vibration and abnormal noise are generated in the washing machine.

  As disclosed in Patent Document 1, the shake of the front portion of the rotating drum 2 is particularly large, and the water tank 3 becomes an object of resonance from the rotating drum 2 only by eliminating the problem of contact with the water tank 3. Corresponding to the generation of abnormal noise that causes abnormal vibration of the aquarium unit 7 as a result of resonance at a first resonance point near 120 rpm, a second resonance point near 250 rp, and a resonance point above 1000 rpm. However, in terms of abnormal noise, in addition to the front imbalance, there is a limit to the rear imbalance, and it is necessary to deal with both. In addition, the vibration behavior of the rotating drum 2 at the time of unbalance becomes a cause of resonance different from the previous unbalance with the water tank 3 regardless of before and after the unbalance, and the vibration behavior and vibration load with the water tank 3 are different. It is not possible to deal with damages at the joints due to.

  Therefore, in the present embodiment, the vibration detection means 40 that detects vibration components in a plurality of directions is provided at the front portion of the water tank 3, and the control means 20 outputs, for example, the moment when the rotation speed is constant or at a certain moment. Output signal FFR of vibration components in a plurality of directions related to the front-rear direction (FFR), front-left-right direction (FLR), front-up-down direction (FUD) as shown in FIG. Based on FLR and FUD, in the process of increasing rotation as shown in FIG. 3 in the dehydrating operation after the washing and rinsing process, therefore, in the process of changing the pp value of each output signal shown in FIG. And a predetermined time t from a peak time point P at which the amplitude of the output signal FLR related to the vibration component in the left-right direction before detection is equal to or greater than a predetermined first reference value B1 that is less than the first threshold value A1 that causes a pre-unbalance abnormality. The output signal FL during If the amplitude increase ΔB of the output signal FFR related to the vibration component in the front / rear direction generated after the current is greater than or equal to a predetermined second reference value B2 as shown in FIG. As shown in FIG. 5B, if it is less than the predetermined second reference value B2, it is determined as a front imbalance. In particular, when it is determined as a rear imbalance, the vibration component in the front left / right direction is determined. When the amplitude at the peak time of the output signal FLR is higher than the second threshold value A2 which is lower than the first threshold value A1 by the predetermined width A3, it is determined that the imbalance is abnormal, thereby providing a response to the subsequent imbalance abnormality. Like that.

  Thus, the vibration detection means 40 is on the water tank 3 and outputs signals FFR, FLR, FUD corresponding to vibrations in a plurality of directions including the front left / right direction and the front / rear direction of the water tank 3. Output signal FLR related to the vibration component of the front is detected prior to the output signal FFR related to the vibration component in the front-rear direction, so that the output signal FLR related to the vibration component in the front-rear direction is greater than or equal to the first reference value B1 It can be detected ahead of others. The increase width ΔB or the increase rate ΔB / t of the output signal related to the vibration component FFR in the rear unbalance direction during the predetermined time t from the peak time point P at which the first reference value or more is detected is the second reference value. It is possible to determine whether the above is a post-unbalance or a pre-unbalance by using the correlation with whether it is a post-unbalance.

  After the determination of the rear unbalance, the rear unbalance depends on whether the amplitude of the detected output signal FLR of the vibration component in the rear unbalance direction is equal to or larger than the second threshold A2 shown in FIG. It can be used for one or more determinations of a balance abnormality, and can be used for dealing with an abnormality. Further, the front unbalance abnormality is shown in FIG. 5 in which the amplitude of the output signal FLR of the vibration component in the front left / right direction that is detected ahead of time without determining the front unbalance is correlated with the front unbalance abnormality. It can be used for one or more determinations of pre-unbalance abnormality depending on whether or not it is greater than or equal to the first threshold value A1, and can be used for dealing with abnormal cases. In addition, the determination of the front and rear imbalance abnormality can be omitted at least until the first reference value B1 is exceeded, and it can be omitted even after the rear unbalance determination giving priority to the response to the rear unbalance abnormality. Can do.

According to such a technique, before the detection before the output signal FFR related to the vibration component in the front-rear direction, the relationship between the two output signals FLR and FFR output from the vibration detection means 40 is skillfully used. The increase width ΔB or the increase rate ΔB / t of the former output signal FFR during a predetermined time t from the peak time point P at which the output signal FLR related to the vibration component in the left-right direction is detected to be equal to or greater than the first reference value B1. By determining whether the rear imbalance is greater than or equal to the second reference value B2, the output signal FLR related to the vibration component in the rear imbalance direction detected thereafter depends on whether the amplitude is equal to or greater than the second threshold A2. The output signal FLR of the vibration component in the front left / right direction that is used for one or a plurality of determinations of the rear imbalance abnormality and that is detected prior to the other is based only on whether the amplitude is greater than or equal to the first threshold A1. Furthermore, it is possible to easily and quickly achieve the simple determination of one or more times of the pre-unbalance abnormality, and it is possible to deal with these abnormalities. In addition, the determination of the front and rear imbalance abnormality can be omitted at least until the first reference value B1 is exceeded.

  FIG. 6 shows the temporal change in front left / right amplitude, front front / rear amplitude, and rear left / right amplitude due to the front imbalance of the laundry, and the difference in peak value. The front left and right amplitudes are remarkably high, and represent the flourwood movement well, and it can be seen that the rear left and right amplitudes can be evaluated from the relationship between the front left and right amplitudes and the front and rear amplitudes.

  In addition, by providing the vibration detection means 40 in the vicinity of the front end of the water tank 3, it can be said that the vibration component in the front left / right direction and the vibration component in the front / rear direction of the water tank 3 are easily reflected in the output signal of the vibration detection means 40.

  Here, according to one embodiment, the first reference value B1 is effective when it is 15 mm or more, the predetermined time t is 2 seconds, the second reference value B2 is 1 mm or more, and the first threshold value A1 is 25 mm. The second threshold A2 is effective as a rear unbalance of 20 mm. However, it is not limited to this. Here, the relationship of A1> A2 is that the influence of the vibration at the time of the rear unbalance abnormality is larger than the case of the front unbalance abnormality, and the influence on the front unbalance abnormality and the aquarium unit 7 itself and the surroundings becomes a problem. Correspondingly, the determination values for the front and rear imbalance abnormalities are made different, and the determination threshold A2 for the rear imbalance abnormality is made stricter than the determination threshold A1 for the front imbalance abnormality.

  Specifically, when such first and second threshold values A1 and A2 are used, the pre-unbalance abnormality is caused by the fact that the amplitude of the corresponding output signal FLR is not less than the first threshold value A1 stored in advance. The post-unbalance abnormality is determined by determining that the amplitude of the corresponding output signal FFR is higher than the first threshold value A1 by substituting the second threshold value A2 for a value A1-A3 that is lower by a predetermined width A3. To do. As described above, the maximum amplitude value of the corresponding output signal FLR to be determined as the pre-unbalance abnormality reflects an allowable relationship more than the maximum amplitude value of the corresponding output signal FFR to be determined as the post-unbalance abnormality. By substituting the threshold value for the determination of the rear imbalance abnormality with a value that is a predetermined width lower than the first threshold value that is the maximum amplitude value of the corresponding output signal for determining the front imbalance abnormality, only the first threshold value A1 is used. It is possible to determine and deal with the first before and after unbalance abnormalities corresponding to the differences in their properties and influences simply by storing them in advance. Note that the post-unbalance abnormality is determined by adding a predetermined width to the detected amplitude values of the corresponding output signals FFR and FLR and determining whether or not it is greater than or equal to the first threshold value A1. This is equivalent to substituting the value A1-A3 lower by the predetermined width A3 for the second threshold value A2, and the same effect can be obtained.

  Here, an example of the case where dehydration control is performed while there is a front / rear balance abnormality with the determination of front / rear unbalance, front / rear unbalance abnormality while increasing the rotation of the rotating drum 2, This will be specifically described with reference to the flowchart shown in FIG.

When the dehydration process starts in step 100, a draining operation for draining the washing water in the water tank 3 is performed in step 101. Thereafter, after initialization of data (N = 1) in step 102, the rotating drum 2 is moved to a third predetermined rotation speed (for example, about 40 rpm) in order to loosen the laundry such as uneven clothes in step 102. Execute forward rotation and reversal operation (unraveling process). Next, in step 103, the laundry is gradually raised to a fourth predetermined rotational speed (about 70 rpm) that allows the laundry to stick to the inner surface of the rotary drum 2. Thereafter, the rotational speed of the rotary drum 2 is further increased, and control is performed in step 104 to maintain the rotary drum 2 at a first predetermined rotational speed (for example, about 80 rpm) lower than the primary resonance rotational speed for a predetermined time. At this time, the rotation unevenness, that is, the presence / absence of initial imbalance is detected. It is sufficient to determine the unbalanced state on behalf of the front left / right unbalance, which also reflects. Further, the determination threshold value can be handled with less than the first reference value B1 used for the determination of the front and rear imbalance. The determination can also be made by not outputting signals from the detected rotational speed detecting means (position detecting means 24a, 24b, 24c) 24 at a predetermined interval.

  Here, if there is an unbalance greater than or equal to a predetermined value, it is determined that the rotation unevenness 2 is large and the balance state is poor, and it is determined in step 105 whether or not N = 4. If N = 4 is not satisfied, the rotating drum 2 is temporarily stopped as shown in FIG. 3 in the next step 106, then 1 is added to N at the present time in step 107, and the process returns to step 102. If the operation from step 102 to 107 is repeated a predetermined number of times, that is, if N = 4 in step 105, it can be assumed that the bias of the selection will not be eliminated by repeating the solving process in step 102. Give up and move on to the next process. If there is no rotation unevenness and it is normal, the process proceeds to the next step 109 as it is.

  The rotation drum 2 outputs from the vibration detection means 40 the front, rear unbalance, front and rear unbalance abnormalities in the section "1" at step 109: 120 to 140 rpm (near the primary resonance rotational speed). If it is determined by the signal and there is a front or rear imbalance abnormality, the process returns to step 106. If the front or rear imbalance abnormality does not occur and is normal, the process proceeds to the next step 110 as it is. Here, the determination of the front and rear imbalances is simple and early with the front unbalance when the front up / down amplitude / front front / rear amplitude <1 and the front unbalance when the front vertical amplitude / front front / rear amplitude> 1. You can also Further, since the rotational speed of the rotating drum 2 is lower than the resonance range, it is effective to set the threshold value A1 of the front left / right imbalance abnormality as low as about 20 mm. The rear imbalance abnormality threshold value A2 is effective when lower than 20 mm.

  In step 110, the front, rear unbalance, front and rear unbalance abnormalities in the section “2”: 141 to 330 r / min (near the secondary resonance rotation speed) are output signals from the vibration detection means 40. If it is determined that there is a front or rear unbalance abnormality, the process returns to step 106. If the front or rear imbalance abnormality does not occur and is normal, the process proceeds to the next step 111 as it is. Here, the determination of the front / rear unbalance is made based on the first and second reference values B1 and B2 described above, and if there is no front or rear unbalance abnormality and it is normal, The threshold value A1 for the left / right imbalance abnormality is effective when set to a low value of about 25 mm. The threshold value A2 for the rear imbalance abnormality is effective as 20 mm.

In step 111, in the rotation range where it becomes difficult to eliminate the sticking of the laundry to the rotating drum 2, for example, at 880 rpm or more, the front, rear unbalance, front and rear unbalance abnormalities of the aquarium unit 7 are detected from the vibration detecting means 40. Judgment is made based on the output signal, and if the front or rear imbalance abnormality is detected, the rotation is continued at the rotation speed at which the front or rear imbalance abnormality has occurred without increasing the rotation speed. If the front or rear imbalance abnormality does not occur and is normal, the process proceeds to step 111 as it is to increase the target rotational speed to the end of the dehydration process. In this case, it is possible to easily and quickly determine the front imbalance when the front / rear amplitude is equal to or smaller than the front left / right amplitude, and the front / rear amplitude is greater than the front left / right amplitude. In this case, the threshold values A1 and A2 for the front left / right imbalance abnormality in this rotational range are each effective as 10 mm.

  When the cloth bias correction operation in step 108 is performed by forward / reverse arc rotation of the rotary drum 2, the rotational speed of the rotary drum 2 is set to 40 rpm or more so that the rotary drum is rotated during sudden braking to reverse the forward / reverse direction. Since a strong inertial force is applied to the laundry attached to 2 and peeled off from the rotating drum 2, the laundry is dropped in a direction opposite to the left and right sides, so that the laundry can be effectively peeled off. The peeled laundry has an advantage that it can be unraveled while being switched left and right by the subsequent forward and reverse arc rotation, and can be evenly distributed in the front and rear and left and right within the rotary drum 2. Such a left-right interchange of the laundry requires that the laundry be lifted higher, and therefore, it is preferable to perform forward and reverse arc rotation of the rotary drum 2 at an angle of, for example, more than 90 ° and less than 180 °.

  On the other hand, in the drum-type washing machine 1 according to the present embodiment, the support position Q and the center of gravity G by the anti-vibration damper 70 as seen in the direction of the rotating shaft 2a with respect to the central position S of the water tank 3 in the direction of the rotating shaft 2a. Both are located on the rear side, and the distance L1 between the center position S and the support position Q is greater than the distance L2 between the center position S and the center of gravity G, and the support position Q is not behind the center of gravity G when viewed in the direction of gravity. In any case, because of the relationship located near the front, the flourwood movement of the aquarium unit 7 greatly affects the front compared to the rear of the aquarium 3, regardless of whether the front or rear imbalance is present. As a result, in addition to the vibration components in the left and right, front and rear, and up and down directions of the front portion of the water tank 3, the vibration components in the rear left and right and rear and up and down are synthesized with high correlation.

  By utilizing these correlations, it is possible to execute simple control to cope with an unbalance abnormality corresponding to the necessary unbalance of each vibration component including the rear unbalance, using only the previous vibration information.

  It is practically used for dewatering in a drum-type washing machine with a rotating drum installed in a horizontal direction or at an angle, making it easy to determine post-unbalance due to laundry bias and abnormal imbalance while the rotational speed of the rotating drum is increasing. It is quick and can respond to abnormalities accurately.

Sectional drawing which shows the principal part structure of the drum type washing machine which concerns on embodiment of this invention. Block diagram of control circuit of the drum type washing machine Graph for explaining the unbalance determination and unbalance abnormality determination indicating the rotation speed change of the rotating drum in the dewatering process of the drum type washing machine Waveform diagram of the output signal corresponding to the vibration components in the front left and right, front front and rear, front and top and bottom directions detected by the vibration detection means of the water tank of the drum type washing machine Explanatory drawing which shows the procedure which performs the determination of front, back imbalance, and the determination of front, rear unbalance abnormality from the relationship between the vibration component of the front left-right direction of the water tank of the drum type washing machine, and the vibration component of the front-back direction. The graph which compares and shows each amplitude characteristic in the vibration component of three directions of the water tank of the drum type washing machine Explanatory drawing which shows the procedure which determines the front and back imbalance from the relationship between the vibration component of the front left-right direction of the water tank of the drum type washing machine, and the vibration component of the front front-back direction. Explanatory drawing which shows the procedure which determines the front and back imbalance from the relationship between the vibration component of the front left-right direction of the water tank of the drum type washing machine, and the vibration component of the front front-back direction. Flowchart showing a control example including determination of before / after unbalance, determination of before / after unbalance abnormality, and response to abnormality at the time when the rotation speed of the rotating drum is increased in the dewatering process of the drum type washing machine

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drum type washing machine 2 Rotating drum 2a Rotating shaft 3 Water tank 5 Motor 6 Washing machine housing 7 Water tank unit 9 Door 20 Control means 24 Rotational speed detection means 30 Cloth amount detection means 40 Vibration detection means 70 Vibration damping damper

Claims (1)

A rotating drum formed in a cylindrical shape with a bottom is installed in a water tank that is elastically supported so that the axis of rotation is inclined horizontally or horizontally downward from the opening front side to the bottom side. In a drum type washing machine driven by a motor fixed to the back of the water tank, a control means for controlling the rotation of the motor and a vibration detection means for detecting vibration components in a plurality of directions at the front part of the water tank. The control means includes an output relating to the vibration component in the front left / right direction based on the output signal of the vibration component in the plurality of directions output from the vibration detection means in the process of increasing the rotation in the dehydrating operation after the washing and rinsing process. The front-rear direction generated after the output signal for a predetermined time from the peak time when the amplitude of the signal is equal to or higher than a predetermined first reference value that is less than a first threshold value that is considered to be a pre-unbalance abnormality If the increase width of the amplitude of the output signal related to the vibration component is equal to or greater than the predetermined second reference value, it is determined that the rear unbalance is determined. A drum-type washing machine characterized by determining an unbalance abnormality when the amplitude at the peak time of the output signal is higher than a second threshold value that is a predetermined width lower than the first threshold value.

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