JP3555818B2 - Drum type rotary processor - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a drum-type rotary processing apparatus such as a drum-type washing machine that performs washing and dehydration (and sometimes even drying) of cloth products such as clothes, and a drum-type dryer that merely performs drying.
[0002]
[Prior art]
As is well known, in a drum-type washing machine, during washing, the drum is rotated at a low speed at a speed at which the object to be processed moves, and during dehydration, the drum is rotated at a high speed at a speed at which the object does not stick to the inner peripheral surface of the drum and fall. However, there is a problem that abnormal vibration occurs when the workpiece in the drum is unevenly distributed during high-speed rotation, and many proposals have been made to solve this problem. I have.
[0003]
For example, Japanese Patent Publication No. 50-16099 has a detection device for detecting the horizontal amplitude of a drum, and detects the amplitude of a water tank including a drum with this detection device at low speed rotation. There is disclosed a drum type washing machine in which the drum is shifted to the high speed rotation only when it is equal to or less than a prescribed value and continues for at least one cycle (one rotation) of the drum.
[0004]
Japanese Unexamined Patent Publication (Kokai) No. 64-40094 discloses that when the drum is loosened at a low speed of 50 to 60 rpm, the laundry is shifted to 120 to 200 rpm and the vibration value at this time is smaller than a preset reference value. There is disclosed a drum type washing machine in which the rotation speed is changed to high speed.
[0005]
[Problems to be solved by the invention]
In the case of the conventional drum type washing machine as described above, in the former, the object to be processed is constantly rolling in the drum at low speed rotation, and the amplitude of the drum is not stabilized, even during one rotation. Since it is constantly changing, even if the drum is started to rotate at a high speed when the amplitude is equal to or less than the specified value, it is unknown whether the drum shifts to the high speed as it is. In addition, although there was a certain effect to prevent only a large abnormal vibration, it was not applicable to lower the vibration.
[0006]
In the latter case, the object to be processed rolls while adhering to or peeling off from the peripheral wall of the drum while rotating at 50 to 60 rpm. The object stuck to the drum peripheral wall in various states, and it was difficult to achieve the intended low unbalance state.
[0007]
Note that the above problem is not limited to the drum type washing machine, and there is a similar problem in a drum type drying machine which performs only drying and other drum type rotary processing devices.
[0008]
SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and an object of the present invention is to provide a drum-type rotation processing apparatus that can start a drum at a high speed at an intended vibration level. is there.
[0009]
[Means for Solving the Problems]
The drum type rotary processing apparatus of the present invention has been made in order to achieve the above object, and the invention according to claim 1 first has a structure in which the object to be processed is uniformly adhered to the inner surface of the drum. rotational speed immediately before the entire object to be processed from sticking to the inner surface of the drum, in other words the central portion of the drum, only a part of the object is accelerated to the target rotational speed N ₁ which may swing to closer positions, following to be more accelerated for determining whether it is possible to accelerate the high rotational speed, the rotational speed N ₂ is lower than the higher resonance rotational speed than the rotational speed after a predetermined time t ₁ to a target. And when the output of the unbalance detecting means after a predetermined time t ₂ is the predetermined value alpha ₂ below, in which so as to accelerate a higher speed of the rotational speed.
[0011]
Further, an invention according to claim 2, wherein, in the invention according to the first aspect, if the output of the unbalance detecting means within a predetermined time t ₃ becomes the rotational speed N ₂ does not become a ₂ less than the predetermined value alpha, The rotation of the drum is decelerated or stopped, and the above-described acceleration operation is performed again .
[0012]
According to a third aspect of the present invention, in the second aspect, the forward rotation of the drum is decelerated or stopped, and in the step of performing the forward rotation acceleration operation again, the deceleration or the stop of the normally rotated drum is performed. After performing the operation at least once, the drum is turned over for a predetermined time, and then the above-described acceleration operation is performed again by normal rotation .
[0013]
And also, an invention according to claim 4, wherein, in the invention according to the first aspect, it is an less 330g unbalance quantity corresponding to the predetermined value alpha _2.
[0015]
Further, an invention according to claim 5, wherein, in the third aspect of the present invention, the rotation speed to reverse the drum is to the N ₁ or less.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment in which an embodiment of a drum-type rotation processing apparatus of the present invention is applied to a drum-type washing machine will be described with reference to the drawings.
FIG. 1 is a side sectional view of a schematic structure of a drum type washing machine showing an embodiment of a drum type rotation processing apparatus of the present invention.
[0017]
The drum-type washing machine shown in FIG. 1 has a box-shaped outer frame 1, a water tub 2 provided in the outer frame 1 for storing a washing liquid, rinsing water, and the like, and rotatably supported in the water tub 2. And a drum 3 for storing laundry. The drum 3 has a cylindrical shape with a diameter of about 46 cm, has a large number of small holes 3a all around its peripheral wall, and is rotatable by a bearing 7 provided in the water tank 2 via a horizontal shaft 6 protruding from the back wall. Supported.
[0018]
Reference numeral 8 denotes a drum motor as a rotation driving means for rotating the drum 3, and a pulley 9 is fixed to a rotation shaft thereof. The pulley 9 is connected via a drive belt 10 to a drum drive pulley 11 fixed to the horizontal shaft 6. A door 12 is provided on the front of the outer frame 1 and opens and closes for taking in and out laundry.
[0019]
Reference numeral 17 denotes a rotation sensor for detecting the number of rotations of the drum 3, which comprises a reed switch 18 fixed to the outer surface of the water tank and a magnet 19 fixed to the drum driving pulley 11 so as to face the reed switch 18. The rotation sensor 17 is a known one, and a detailed description thereof will be omitted.
[0020]
Further, the water tank 2 is provided with a water supply pipe 41 for supplying water, a circulation pipe 42 for circulating the washing liquid and rinsing water, a water storage tank 43 for circulating and storing the washing liquid and rinsing water, and for discharging the washing liquid and rinsing water. Outlet 44. An operation panel 45 such as a power switch and a start switch is provided on the front surface of the outer frame 1.
[0021]
And this drum type washing machine is provided with the vibration detection means which has the vibration sensor for detecting the vibration of the water tub 2. The vibration detecting means is an example of the unbalance detecting means. The vibration caused by the imbalance is generated by the imbalance moving with the rotation of the drum 3 as shown in FIGS. 6 (a) and 6 (b). Considering only the horizontal direction, the drum swings to the left when moving to the left, and swings to the right when moving to the right. That is, if there is an imbalance, the drum 3 swings right and left once during one rotation, so that it can be grasped as a vibration waveform.
[0022]
FIG. 2 is a configuration diagram showing a mounting position of the vibration detecting means, and shows that the vibration detecting means 20 is mounted so as to detect a horizontal component parallel to the rotation direction of the drum 3 of the vibration of the water tank 2. In addition, a shock absorber 4 for buffering vibration, which cannot be represented in FIG. 1 in FIG. 2, supports the bottom surface of the water tank 2, and a spring 5 for buffering vibration is provided so as to suspend the water tank 2. I have. The water tank 2 is supported in the outer frame 1 so as to be able to vibrate by the shock absorber 4 and the spring 5.
[0023]
Examples of the vibration sensor 20 include a displacement sensor that directly detects the amplitude of the water tank 2 and an acceleration sensor that uses a piezoelectric effect of a quartz or ceramic piezoelectric element that outputs an electric signal proportional to the acceleration applied to the water tank 2. Is mentioned. The embodiment of the present invention employs an acceleration sensor.
[0024]
The principle of the acceleration sensor is as follows. The weight in the housing constituting the vibration sensor 20 applies a force to the piezoelectric element by external vibration, and the piezoelectric element loses the balance between positive ions and negative ions due to the stress and generates electric charges. The charges are stored in the electrodes and finally output through the circuit. The amount of charge stored is proportional to the applied force, which is proportional to the acceleration.
[0025]
FIG. 3 is a block diagram of a vibration detection circuit when the vibration sensor is an acceleration sensor. In the figure, a signal output from an acceleration sensor (vibration sensor) 20 is amplified by an amplifier circuit 21, converted by a low-pass filter 22, further amplified by an amplifier circuit 23, and output as a vibration waveform.
[0026]
FIG. 4 shows a basic circuit of a low-pass filter. In the figure, 24 and 25 are input terminals to which the output of the sensor 20 is given, 26 is an operational amplifier, R1 is a resistor, C1 is a capacitor, C2 is a feedback capacitor, and 27 is an output terminal. A low-pass filter of about 3 Hz is suitable. That is, since the vibration waveform is greatly different due to a difference in vibration characteristics of the vibrating body, for example, a difference in a spring constant, a rotation speed, and a fast movement of an object to be processed, the waveform processing should be performed so as to be applicable to any vibration system. Just fine.
[0027]
Next, an electronic control circuit which is a control means of the drum type washing machine according to the embodiment of the present invention will be described with reference to FIG.
As shown in FIG. 5, the electronic control circuit includes a CPU 100 including a control unit and an arithmetic unit, a data bus 101, a ROM and a RAM memory 102, an I / O interface 103, a rotation sensor 17, and outputs from the rotation sensor 17. A rotation speed detection circuit 104 for detecting a rotation speed, a vibration detection means 20 including a vibration detection circuit, an A / D converter 105 for converting an output of the vibration detection means 20 into a digital amount, setting of various processes such as washing and rinsing, and the like. It has a key input unit 106 for giving an execution instruction, a drum motor 8, a drive circuit 107 for driving the drum motor 8, and the like.
[0028]
It will now be described rotational speed _{N 1.} Now, taking as an example a case where an object to be processed (cloth) is put into a drum having an inner diameter of 46 cm and rotated, in order to stick the object to be processed to the inner peripheral wall of the drum, a material point on the inner surface of the peripheral wall of the drum 3 is required. Must be rotated such that the acceleration α of the drum 3 is at least equal to or higher than the gravitational acceleration.
[0029]
The relationship between the rotation speed n, the peripheral speed v, and the acceleration α of the drum 3 is as follows: When the radius of the drum 3 is represented by r,
v = 2πrn / 60 and α = v ² / r. Now, r = 0.23m,
If α = 9.8 m / s ² , the rotation speed n is 63 rpm. This is equivalent to the case where the object to be processed has no thickness and is not realistic.
[0030]
Next, a description will be given in consideration of the thickness of the workpiece. When the drum 3 starts rotating, the object to be processed is pressed against the peripheral wall of the drum 3 by centrifugal force as shown in FIG. Therefore, when the acceleration of the mass point of the inner diameter of the cavity (average value: evenly distributed if there is no imbalance, but becomes uneven as shown in FIG. 6 if there is imbalance), the acceleration of the mass point is equal to or higher than the gravitational acceleration. If there is no imbalance, the whole object will stick to the peripheral wall of the drum 3.
[0031]
If there is an imbalance, the acceleration of the mass point at the convex portion as shown in FIG. 6 can be moved (falls) below the acceleration of gravity. Therefore, when a part of the object to be processed at this mass point moves little by little without sticking, the balance state changes. Accordingly, the acceleration of the mass point having the average inner diameter can be set as the acceleration of gravity, and the rotational speed of the drum can be set.
[0032]
For example, in order to make the acceleration of a mass point having an inner diameter of 24 cm equal to the acceleration of gravity, the rotational speed n is 86 rpm from the above equation, and in the case of 26 cm, the rotational speed n is 83 rpm. In this embodiment, as 46cm and internal diameter of the drum 3, the rotational speed _{N 1} was 85 rpm.
[0033]
Next, a description will be given rotational speed _{N 2.} Because it aims to detect the magnitude of the unbalance in a state in which the whole object to be treated was affixed to the inner wall of the drum 3 after the rotational speed N _1, of course revolution speed N ₂ is to be higher than N ₁ . On the other hand, when the rotation speed of the drum reaches a resonance rotation speed (for example, 250 rpm) due to the vibration characteristics of the vibrating body, a resonance phenomenon occurs and the vibration becomes particularly large. . Thus, the rotational speed N ₂ is intended to be less than the rotational speed vibration co. In this embodiment, the rotational speed _{N 2} was 200rpm less suitable values above 100 rpm.
[0034]
Next, a description will be given predetermined value alpha ₂ of the output of the unbalance detecting means. When the drum is rotated at high speed for example 1,000 rpm, in order to make the vibration acceleration of the floor around the rotary processor empirically acceptable 1.2 m / S ² or less, determined in the rotational speed N ₂ value the is to a predetermined value (reference value) alpha _2. imbalance corresponding to alpha _2, the result that approximately 330g or less from the experimental results.
[0035]
Next, the operation of the drum type washing machine during the spin-drying process will be described with reference to the flowchart of FIG.
First, the drum 3 rotates accelerate the rotational speed N ₁ to the target in step # 10. Step # determines whether the predetermined time t ₁ has elapsed from the start of rotation at 20, if passed, the drum 3 rotates accelerate the rotational speed N ₂ to a target at step # 30.
[0036]
Steps # 40 N ₂ determines whether t ₂ elapsed from the time of rotational acceleration to the target, if passed, the size of a predetermined value from the output waveform of the vibration detecting means 20 in step # 50 (reference value) determines whether or not alpha ₂ or less, if it is less, it predetermined time t ₃ is determined whether or not followed _(e.g., drum set below time for one revolution or more times a half turn). If this condition is satisfied, the drum 3 is accelerated in step # 120 and rotated at high speed (dehydration rotation).
[0037]
14 to 16 show output waveforms of the vibration detecting means 20. Both of which was accelerated from N ₁ to N ₂ at the time of 4 seconds, has become N ₂ to a point approximately six seconds, it was in a state in which the entire object to be processed from sticking to the drum inner wall. Vibration value at this time to determine whether the reference value alpha ₂ below.
[0038]
In general, if the unbalance also when N ₂ even when the N ₁ are the same, the vibration value also increases with an increase in rotational speed as shown in FIG. 15, which had it into account to set the reference value ing. FIG. 14 shows an example in which the reference value is exceeded, and FIG. 15 shows an example in which the reference value is less than the reference value. The best example is the case of FIG. 16, the rotation speed becomes better balanced between increasing from N ₁ to N _2, the vibration value is what has become even smaller.
[0039]
On the other hand, if satisfy the above conditions, the N ₂ determines whether t ₄ has elapsed from the time of rotational acceleration to the target at step # 60, if passed (e.g., six seconds), the drum 3 at step # 70 The drum 3 is stopped, and the drum 3 is reversed and accelerated in step # 80. Then, it is determined whether the predetermined time t ₅ elapses at step # 90, if passed, the step # 100 of the drum 3 is stopped, the switch to the drum forward rotation in step # 110, the flow returns to step # 10, the Repeat the operation.
[0040]
These steps are shown in the start-up charts of FIGS. These show the basic procedure of controlling the number of rotations of the drum from the relationship with time on the abscissa, with the number of rotations of the drum on the vertical axis. Spun at 10 in t ₁ to N _1, then accelerated to N ₂ over a period of time t _2, and raising the determination up in N _2, if a given vibration below, indicate that further accelerate the high-speed rotation ing. 12 and 13 show the case of restarting. FIG. 12 shows a chart in which when the drum cannot be started because of large vibration, the drum is temporarily stopped, rotated again in the same direction, and the start is determined.
[0041]
This corresponds to a case where steps # 80 to # 110 in the flowchart of FIG. Particularly in the case 13 that could not rise because the vibration is large, temporarily stopping the rotation of the drum, after the elapse of a predetermined time to rotate the rotational speed N ₀ in the target drum in the opposite direction, it stops the drum, again The motor is rotated forward to determine the startup. N ₀ is set lower than N ₁ so that the object is rolled to loosen the cloth. The timing of inversion is not limited to once, but may be multiple times.
[0042]
Next, another embodiment will be described with reference to the flowchart of FIG. 9, particularly focusing on differences from the flowchart of FIG.
Step # 20 in the drum rotation starting a predetermined time t _{6 (<t 1)} Determine whether elapsed, if passed, step # 25 by the vibration detecting means the reference value alpha ₁ is the magnitude of the output waveform of 20 or less It determines whether or not, if it is less, it is determined whether it is the predetermined time t ₃ continues.
[0043]
Then, if this condition is satisfied, the drum 3 rotates accelerate the rotational speed N ₂ to a target at step # 30. FIG. 11 shows the relationship between the rotation speeds. The difference between FIG. 10 is not to reliably accelerated to N ₂ if the time t _1, so that to accelerate the N ₂ after determining whether to accelerate the vibration state. This acceleration step may be provided in several stages. (See another embodiment below)
Thereafter, the same operation as in FIG. 9 is performed. However, to be met the condition in step # 25, it is determined whether the predetermined time t ₇ elapses in this state at step # 27, the drum 3 is stopped at step # 70, if passed, similarly to the step In step # 80, the drum 3 is reversed and accelerated. The same applies to the following.
[0044]
In another embodiment, a plurality of target rotation speeds are provided before acceleration to a high speed equal to or higher than the resonance rotation speed, and when the output of the unbalance detection means is _{equal to} or less than a predetermined value αn at each rotation speed, the next target rotation speed is set. It accelerates to a number. That is, provided the target rotational speed of the plurality of stages between the rotational speed N ₁ and N _2, when the output is less than a predetermined value alpha _n corresponding to the respective unbalance detecting means, which further accelerate faster to speed It is.
[0045]
In the form of the further embodiment, in the same manner as to determine whether the reference value alpha ₁ or less in the rotational speed N _1, first in the case of the reference value alpha ₁ or less in the rotational speed N _1, N rotational speed higher than ₁ (< n ₂₎ to accelerate, n rotational speed higher than ₁ (<n 2 determines whether less than the reference value alpha _n corresponding to the number of revolutions _in), the reference value alpha _n following the following additional rotational speed when ( <N ₂ ), and further accelerates to the next rotation speed when it is _{equal to} or less than the reference value αn corresponding to the rotation speed. While repeating this operation, in the final N ₂ rpm is to determine whether to accelerate or resonance rotational speed. If a plurality of stages of the target rotational speed between the N ₁ and N _2, it is apparent that become the same manner as in Example 2.
[0046]
In the embodiment of the present invention, the case of a drum-type washing machine that performs washing and dehydration has been described.However, the present invention provides a drum-type washing and drying machine that performs washing, dehydration, and drying, and a drum-type dryer that performs only drying. Alternatively, the present invention can be applied to other types of drum type rotary processing devices.
[0047]
Further, in the embodiment of the present invention, the case of the drum-type rotary processing apparatus of the single-axis support and front-loading type has been described, but the present invention is also applied to the two-axis support type and the top-loading type. be able to.
[0048]
【The invention's effect】
Since the drum type rotary processing apparatus of the present invention is configured as described above, a first aspect of the present invention, the rotation speed N _1, performs a correction of the imbalance, and because there is no large rolling of the object to be processed The unbalanced state has a high correlation with the high-speed rotation. Moreover, since so as to accelerate to by the rotation speed N ₂ when detection of unbalance, but which has enabled the determination of the balance state more reliably. As a result, vibration can be significantly reduced.
[0049]
Further, an invention according to claim 2, wherein, when unbalance is large, instead of continuing long while the drum rotation speed of N _2, to slow or stop the rotation of the drum, for again performing the above-described acceleration operation, Imbalance can be corrected quickly.
[0050]
And also, an invention according to claim 3, wherein, if the imbalance is large, the drum rotation speed in the same manner as the invention of claim 2, wherein instead of continuing long remained N _2, to stop the rotation of the drum, and further inverted After that, the above-described acceleration operation is performed again by the forward rotation, so that the imbalance can be quickly corrected.
[0051]
Further, the invention of claim 4 is a preferred with respect to the floor and the surrounding environment since it is possible to suppress obtain the vibration of the range that can be empirically acceptable at the time of high-speed rotation.
[0052]
According to a fifth aspect of the present invention, in the drum type rotary processing apparatus according to the third aspect of the present invention, the object to be processed starts to be rolled in the drum by setting the number of rotations at which the drum is reversed to N ₁ or less. Therefore, the cloth can be loosened from the strong cloth. As a result, it is possible to relatively quickly balance the object to be processed which is likely to be entangled with the cloth.
[Brief description of the drawings]
FIG. 1 is a side sectional view of a schematic structure of a drum-type washing machine showing an embodiment of a drum-type rotation processing apparatus of the present invention.
FIG. 2 is a configuration diagram showing an attachment position of a vibration detection unit of the drum type washing machine showing the embodiment of the drum type rotation processing apparatus of the present invention.
FIG. 3 is a block diagram of a vibration detection circuit in a case where the vibration detection means of the drum-type washing machine according to the embodiment of the drum-type rotation processing apparatus is an acceleration sensor.
FIG. 4 is a diagram showing a basic circuit of a low-pass filter of a drum type washing machine showing an embodiment of a drum type rotation processing device of the present invention.
FIG. 5 is a block diagram of an electronic control circuit of the drum-type washing machine showing the embodiment of the drum-type rotation processing device of the present invention.
FIG. 6 is a schematic diagram schematically showing a relationship between an unbalanced state and vibration (vibration) of a drum type washing machine showing an embodiment of a drum type rotation processing apparatus of the present invention.
FIG. 7 is a schematic view schematically showing a state of an object to be processed while the drum of the drum type washing machine is rotating, showing an embodiment of the drum type rotary processing apparatus of the present invention.
FIG. 8 is a flowchart showing an operation of the drum type washing machine according to the embodiment of the present invention at the time of a dehydration process of the drum type washing machine.
FIG. 9 is a flowchart showing another operation of the drum type washing machine according to the embodiment of the present invention during the spin-drying process of the drum washing machine.
FIG. 10 is a start-up basic chart showing a control pattern of a rotation speed of a drum of a drum washing machine showing an embodiment of a drum-type rotation processing apparatus of the present invention.
FIG. 11 is a start-up chart in the case of preliminary determination showing a control pattern of a rotation speed of a drum of a drum washing machine showing an embodiment of a drum-type rotation processing apparatus of the present invention.
FIG. 12 is a start chart showing a control pattern of the rotation speed of the drum of the drum washing machine according to the embodiment of the drum type rotation processing apparatus of the present invention, in a case where the start cannot be performed.
FIG. 13 is a chart showing a control pattern of the rotation speed of the drum of the drum washing machine according to the embodiment of the drum-type rotation processing apparatus of the present invention, which is a start-up chart in the middle of the case where start-up was not possible.
FIG. 14 is an actual vibration waveform diagram in a case where the imbalance of the drum type washing machine is large, showing the embodiment of the drum type rotation processing apparatus of the present invention.
FIG. 15 is an actual vibration waveform diagram in a normal case of a drum washing machine showing an embodiment of a drum type rotation processing apparatus of the present invention.
FIG. 16 is an actual vibration waveform diagram of a drum type washing machine according to an embodiment of the present invention in a case where a drum washing machine is very well-balanced.
[Explanation of symbols]
2 Water tank 3 Drum 8 Drum rotation motor 17 Rotation sensor 20 Vibration detection means 22 Low pass filter

Claims (5)

A support rotatably supported in the outer frame, a drum rotatably supported by the support and accommodating an object to be processed, a rotation driving unit for rotating the drum, and a control unit for controlling the rotation driving unit. A drum-type rotation processing apparatus comprising: a control unit configured to set a plurality of rotation speeds of the drum from a low-speed rotation to a high-speed rotation; and an unbalance detection unit configured to detect a bias of the workpiece in the drum. the rotational speed N ₁ to move little by little without some of the object from sticking to accelerate the drum to the target in the drum, and a predetermined time to t ₁ is rotated at the rotational speed N _1, after the predetermined time t ₁ the accelerated higher lower than the resonance rotational speed than the rotational speed rotational speed N ₂ at the target, when the output of the unbalance detecting means after a predetermined time t ₂ is the predetermined value alpha ₂ or less, the faster the rotational speed Have a means to accelerate A drum type rotation processing device characterized by the following. If the output of the unbalance detecting means and the turned rotational speed N ₂ within a predetermined time t ₃ has not become ₂ or less than the predetermined value alpha, decelerate or stop the rotation of the drum, that is performed again the acceleration operation claim 1 Symbol placement of drum type rotary processing apparatus characterized. In the process of decelerating or stopping the normal rotation of the drum and again performing the normal rotation accelerating operation, after performing the deceleration or stop of the normally rotated drum at least once or more, after reversing the drum for a predetermined time, 3. The drum type rotation processing apparatus according to claim 2, wherein the acceleration operation is performed again by forward rotation. The unbalance amount corresponding to the predetermined value alpha ₂ of claim 1 Symbol mounting, characterized in that less 330g drum type rotary processing apparatus. Rpm for reversing the drum drum type rotary processing apparatus according to claim 3, characterized in that the N ₁ or less.

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