Method for controlling washing during spinning in tilt-type washing machine for attenuation of vibration
Method for controlling washing during spinning in a tilt-type washing machine for attenuation of vibration, including (a) a main rotation step for exerting a centrifugal force to the laundry gathered to a center of the inner tub for spreading the laundry to an inside wall of the inner tub before the water discharging step, (b) a laundry disentangle alternately rotating step for alternately rotating the inner tub for a preset times to disentangle the laundry spread to the inside wall of the inner tub, and (c) a supplementary rotating step for rotating the inner tub at a preset RPM to keep the laundry in the tilted inner tub spread evenly during the water discharge step, or alternatively (a) a laundry disentangle alternately rotating step for alternately rotating the inner tub to eliminate the eccentricity of the laundry in the inner tub before the water discharge step, and (b) a determining step either for carrying out a control pattern to eliminate the eccentricity of the laundry if the eccentricity of the laundry after the step (a) is greater than a preset value, or for proceeding to the water discharging step if the eccentricity of the laundry after the step (a) is smaller than the preset value, whereby attenuating the vibration to the minimum.
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This application is a Reissue of U.S. Pat. No. 6,401,284, which was granted on Jun. 11, 2002, based upon U.S. application Ser. No. 09/709,549, filed Nov. 13, 2000.
BACKGROUND OF THE INVENTION1. Field of the Invention
The present invention relates to a tilt-type washing machine, and more particularly, to a method for controlling washing during spinning in a tilt-type washing machine for attenuation of vibration.
2. Background of the Related Art
In general, the necessity for the tilt-type washing machine, having the vertical type washing machine and the drum type washing machine applied thereto, is in increasing trend day by day because the tilt-type washing machine has an excellent washing performance and convenience of use. Referring to
First, the washing cycle has a water supplying step for operating the water supplying device to supply water to the inner tub 3, a washing step for operating the driving device 4 to wash laundry in the inner tub by using a penetrating force of water circulation occurred by rotation of the inner tub, and a dissolving action of detergent, together with a friction force of water circulation caused by reverse/regular direction rotation of the inner tub, a water discharging step for operating the water discharging device 6 to discharge waste water in the inner tub to outside of the washing machine, and a spinning step for rotating a motor in the driving device at a high speed, to extract the waste water from the laundry by using a centrifugal force generated by the high speed rotation of the inner tub.
Second, the rinsing cycle has a water supplying step for operating the water supplying device 5 to supply water to the inner tub 3, a rinsing step for operating the driving device 4 to remove detergent and dirt stuck to the laundry by using water circulation generated at rotation of the inner tub, a water discharging step for operating the water discharging device 6 to extract the waste water in the inner tub to outside of the washing machine, and a spinning step for operating the motor of the driving device at a high speed to extract the waste water in the laundry by using a centrifugal force generated by the high speed rotation of the inner tub. The foregoing steps may be repeated for a few times as required.
Third, the spinning cycle has a spinning step for driving the motor in the driving device 4 at a high speed to extract the water in the laundry by using a centrifugal force generated at a high speed rotation of the inner tub 3, and a water discharging step for operating the water discharging device 6 to discharge the water in the inner tub, which is proceeded on the same time with the spinning step.
However, the related art tilt-type washing machine has the following problems.
First, the washing step or the rinsing step before the water discharging step has the following problems, when, in one side the washing or rinsing is made as the washing water penetrates the laundry by the centrifugal force generated at rotation of the driving motor, and in the other side the washing or rinsing is made as the washing water and the laundry make friction to each other as the washing water circulation is inversed following regular/reverse direction rotation of the driving motor.
Referring to
Accordingly, the present invention is directed to a method for controlling washing during spinning in a tilt-type washing machine for attenuation of vibration that substantially obviates one or more of the problems due to limitations and disadvantages of the related art.
An object of the present invention is to provide a method for controlling washing during spinning in a tilt-type washing machine for attenuation of vibration, in which the vibration is minimized.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described, the method for controlling washing during spinning in a tilt-type washing machine for attenuation of vibration, including a washing cycle having a water supplying step-an alternately rotating(washing) step-a water discharging step-a spinning step, a rinsing cycle having a preset times of repetition of a series of steps with a water supplying step-an alternately rotating (rinsing) step-a water discharging step-a spinning step, and a spinning cycle having a spinning step for carrying out a main water extraction, which are proceeded in a sequence, the method includes (a) a main rotation step for exerting a centrifugal force to the laundry gathered to a center of the inner tub for spreading the laundry to an inside wall of the inner tub before the water discharging step, (b) a laundry disentangle alternately rotating step for alternately rotating the inner tub for a preset times to disentangle the laundry spread to the inside wall of the inner tub, and (c) a supplementary rotating step for rotating the inner tub at a preset RPM to keep the laundry in the tilted inner tub spread evenly during the water discharge step.
In another aspect of the present invention, there is provided a method for controlling washing during spinning in a tilt-type washing machine for attenuation of vibration, including a washing cycle having a water supplying step-an alternately rotating(washing) step-a water discharging step-a spinning step, a rinsing cycle having a preset times of repetition of a series of steps with a water supplying step-an alternate rotating(rinsing) step-a water discharging step-a spinning step, and a spinning cycle having a spinning step for carrying out a main water extraction, which are proceeded in a sequence, the method includes (a) a laundry disentangle alternately rotating step for alternately rotating the inner tub to eliminate the eccentricity of the laundry in the inner tub before the water discharge step, and (b) a determining step either for carrying out a control pattern to eliminate the eccentricity of the laundry if the eccentricity of the laundry after the step (a) is greater than a preset value, or for proceeding to the water discharging step if the eccentricity of the laundry after the step (a) is smaller than the preset value.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention:
In the drawings:
Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Components identical to the related art will be given the same names and the same reference symbols, and explanations of which will be omitted. The method for controlling washing for attenuation of vibration in accordance with a first preferred embodiment of the present invention will be explained with reference to
Referring to
Along with this, referring to
When it is assumed that a radius of the inner tub 3 is ‘R’, and a tilted angle of the inner tub with respect to the ground is ‘θ’, a maximum radial acceleration exerting to the laundry on an inside wall 3a of the inner tub is Rω2, an average radial acceleration exerting to the laundry at a half way to the inside wall 3a is ½(Rω2), and a gravitational acceleration exerting to the laundry in the inner tub is g sin θ. If the inner tub 3 is rotated at an angular speed ω=√{square root over (2 sin θ)/R)}, when the gravitational acceleration is equal to the average radial acceleration, the gravitational acceleration moves the laundry disposed within a ½R region(hereafter called as ‘a central region of the inner tub’) of the inner tub toward a direction of the gravitational acceleration, a radial acceleration(hereafter called as ‘peripheral radial acceleration’) greater than the gravitational acceleration(or the average radial acceleration) but smaller than the maximum radial acceleration moves the laundry disposed between the ½R region to a R region(‘a peripheral region in the inner tub’) toward a direction of the radial acceleration. That is, it can be known that the laundry dispersed in the laundry disentangle alternately rotating step is subjected to different acceleration depending on positions of the laundry in the inner tub 3 in the supplementary rotating step. Consequently, as the laundry at the central region of the inner tub tends to move toward a bottom of the inner tub by the gravitational acceleration, while the laundry at the peripheral region in the inner tub tends to move toward an inside wall 3a of the inner tub by the radial acceleration, the entire laundry in the inner tub can be spread evenly in the inner tub 3 because the laundry even at the central portion is pulled toward the inside wall of the inner tub by the radial acceleration exerting on a portion of the same laundry presented in the peripheral region of the inner tub.
In the meantime, it is preferable that the tilted inner tub 3 of the present invention is rotated at 30˜50 RPM in the supplementary rotating step, which can be obtained under the following condition and equation.
The radius ‘R’ of the inner tub used in the present invention is approx. 0.25-0.3 m, and the tilt angle with respect to the ground is approx. 10-15°.
(½)Rω2=g sin θ
∴ω=√{square root over ((2 g sin θ)R)},
and, ω=x RPM, and x=(60 sec/2π)ω.
Accordingly, it can be known that the angular speed of the inner tub is approx. 30 RPM˜50 RPM, when the above condition is substituted. And, the (½)R of the inner tub taken as a reference for dividing the central region and the peripheral region of the inner tub is given, not for confining the present invention, but for clear expression of the present invention. That is, within a scope of the invention, the reference may be any point between the center of the inner tub 3 to the inside wall 3a of the inner tub.
The operation of the method for controlling washing during spinning in a tilt-type washing machine for attenuation of vibration will be explained.
In the main rotating step, the laundry is moved to the inside wall 3a of the inner tub by the centrifugal force(see FIG. 4A). According to this, the problem in the related art can be prevented, in which the laundry is gathered at a place in the inner tub at the times the alternately rotating steps (washing or rinsing step) are finished. And, in the laundry disentangle alternately rotating step, the laundry is disentangled to spread evenly in the inner tub 3 (see FIG. 4B). Eventually, the related art problem of the eccentricity of weight caused by entangled laundry in the spinning step can be prevented in advance. Along with this, if the supplementary rotating step and the water discharging step are carried out on the same time, the laundry is kept to spread evenly in the inner tub 3 (see FIG. 4C), and settled on the bottom of the inner tub upon finishing the water discharge step. According to this, the related art problem of gathering of the laundry to one place in the water discharging step can be prevented in advance. Therefore, provided that the aforementioned series of process is carried out, the vibration caused by the eccentricity in the spinning step, when the inner tub 3 is rotated at a high speed, can be reduced. That is, as shown in
Referring to
The operation of the foregoing method for controlling washing for attenuation of vibration in accordance with a second preferred embodiment of the present invention will be explained.
Referring to
In the meantime, the control pattern is provided for preventing vibration owing to the eccentricity greater than the preset value, i.e., excessive vibration of the tilt type washing machine during spinning in advance, operation of which embodiments will be explained.
Referring to
Referring to
In the meantime, the supplementary control pattern is provided for preventing vibration owing to the eccentricity greater than the preset value, i.e., excessive vibration of the tilt type washing machine during spinning in advance, operation of which embodiment will be explained.
Referring to
In the meantime, it can be known that the aforementioned all steps of the present invention are applicable to the washing cycle including the water supplying step-the alternately rotating(washing) step-the water discharging step-the spinning step, and the rinsing cycle including a preset times of repetition of a series of steps having the water supplying step-the alternately rotating(rinsing) step-the water discharging step-the spinning step.
As has been explained, the method for controlling washing during spinning in a tilt-type washing machine for attenuation of vibration of the present invention has the following advantages.
Because the laundry is distributed evenly in the inner tub before the water discharge step, and the even distribution of the laundry is maintained during the water discharging step, the vibration of the washing machine can be reduced significantly when the operation proceeds to the spinning step.
In the meantime, the method for controlling washing during spinning in a tilt-type washing machine for attenuation of vibration in accordance with a second preferred embodiment of the present invention has the following advantage.
The determination of unbalance at first before the water discharge step is carried out results to a state water is in the inner tub always. That is, even if no water is supplied to the inner tub, the laundry disentangle alternately rotating step can be carried out smoothly for reducing the eccentricity of the laundry, which saves water actually, and shortens a washing time period, substantially.
And, all the advantages described in the detailed description of the preferred embodiment are included.
It will be apparent to those skilled in the art that various modifications and variations can be made in the method for controlling washing during spinning in a tilt-type washing machine for attenuation of vibration of the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
Claims
1. A method for controlling washing during spinning in a tilt-type washing machine for attenuation of vibration, the method including a washing cycle having a water supplying step-an alternately rotating(washing) step-a water discharging step-a spinning step, a rinsing cycle having a preset times of repetition of a series of steps with a water supplying step-an alternately rotating(rinsing) step-a water discharging step-a spinning step, and a spinning cycle having a spinning step for carrying out a main water extraction, which are proceeded in a sequence, the method comprising:
- (a) a main rotation step for exerting a centrifugal force to the laundry gathered to a center of the inner tub for spreading the laundry to an inside wall of the inner tub before the water discharging step;
- (b) a laundry disentangle alternately rotating step for alternately rotating the inner tub for a preset times to disentangle the laundry spread to the inside wall of the inner tub; and,
- (c) a supplementary rotating step for rotating the inner tub at a preset RPM to keep the laundry in the tilted inner tub spread evenly during the water discharge step.
2. A method as claimed in claim 1, wherein the inner tub rotates alternately less than 10 times in the step (b).
3. A method as claimed in claim 1, wherein the supplementary rotating step includes the step of rotating the inner tub at ω=√{square root over ((2 g sin θ/R)} when a gravitational acceleration ‘g sin θ’ exerting to the laundry in the inner tub and an average radial acceleration ‘(½)Rω2’, exerting to the laundry at a half way to the radius of the inner tub are equal, so that the laundry within a (½) area of the inner tub tends to move in a direction of the gravitational acceleration, and the laundry between (½)R and R area of the inner tub tends to move in a direction of the radial acceleration by a radial acceleration greater than the gravitational acceleration(or the average radial acceleration) and smaller than the maximum radial acceleration ‘Rω2, for spreading the laundry evenly, where ‘R’ denotes a radius of the inner tub and ‘θ’ denotes a tilt angle of the inner tub with respect to the ground.
4. A method as claimed in claim 3, wherein the present PRM is 30-50 RPM, when the radius ‘R’ of the inner tub is 0.25-0.3 m, and the tilt angle with respect to the ground is 10-15°.
5. A method as claimed in claim 1, wherein the preset RPM is 30-50 RPM, when the radius ‘R’ of the inner tub is 0.25-0.3 m, and the tilt angle with respect to the ground is 10-15°.
6. A method for controlling washing during spinning in a tilt-type washing machine for attenuation of vibration, the method including a washing cycle having a water supplying step-an alternately rotating(washing) step-a water discharging step-a spinning step, a rinsing cycle having a preset times of repetition of a series of steps with a water supplying step-an alternately rotating(rinsing) step-a water discharging step-a spinning step, and a spinning cycle having a spinning step for carrying out a main water extraction, which are proceeded in a sequence, the method comprising:
- (a) a laundry disentangle alternately rotating step for alternately rotating the inner tub to eliminate the eccentricity of the laundry in the inner tub before the water discharge step; and,
- (b) a determining step either for carrying out a control pattern to eliminate the eccentricity of the laundry if the eccentricity of the laundry after the step (a) is greater than a preset value, or for proceeding to the water discharging step if the eccentricity of the laundry after the step (a) is smaller than the preset value.
7. A method as claimed in claim 6, wherein the control pattern includes the steps of:
- carrying out the laundry disentangle alternately rotating step again for dropping the eccentricity of the laundry below the preset value,
- carrying out the determining step again, and
- automatically stopping the washing if the eccentricity of the laundry is kept greater than the preset value until the foregoing steps are repeated for a preset times.
8. A method as claimed in claim 6, wherein the control pattern includes the steps of:
- determining an extent of the eccentricity and an eccentric position of the laundry,
- carrying out an optimal laundry disentangle alternately rotating step centered on the eccentric position of the laundry for dropping the eccentricity of the laundry below the preset value,
- carrying out the determining step again, and
- automatically stopping the washing if the eccentricity of the laundry is kept greater than the preset value until the foregoing steps are repeated for a preset times.
9. A method as claimed in claim 8, wherein the eccentric position of the laundry is determined to be as a region at which the angular speed of the inner tub is reduced by weight of the eccentric laundry itself when the eccentric laundry is moved upward, and increased by weight of the eccentric laundry itself when the eccentric laundry is moved downward.
10. A method as claimed in claim 6, wherein the extent of eccentricity is defined to be a size of oscillating component deviated from a fixed speed when the inner tub is rotated at the fixed speed.
11. A method as claimed in claim 6, further comprising the supplementary determining step before the spinning step, for carrying out the supplementary control pattern to eliminate the eccentricity of the laundry if the eccentricity is greater than the preset value after the water discharge step, or proceeding to the spinning step if the eccentricity is greater than the preset value after the water discharge step.
12. A method as claimed in claim 11, wherein the supplementary control pattern includes the steps of;
- supplying water to the inner tub,
- carrying out the laundry disentangle alternately rotating step again for eliminating the eccentricity of the laundry,
- carrying out the determining step, again,
- carrying out the water discharging step, again,
- carrying out the supplementary determining step again, and
- automatically stopping the washing if the eccentricity of the laundry is kept greater than the preset value until the foregoing steps are repeated for a preset times.
13. A method as claimed in claim 6, further comprising a step for rotating the inner tub at 30-50 RPM to keep the laundry in the tilted inner tub spread evenly during the water discharge step.
14. A method for controlling attenuation of vibration in a tilt-type washing machine having an inner tub, the method comprising, in the following order:
- a) a laundry disentangle alternately rotating step to alternately rotate the inner tub to eliminate eccentricity of laundry in the inner tub without water discharge and before a main water extraction and after a washing step or rinsing step; and
- b) a determining step to proceed to the main water extraction step if the eccentricity of the laundry after the step (a) is smaller than a preset value.
15. The method as claimed in claim 14, wherein the inner tub rotates alternately less than 10 times in the step (a).
16. The method as claimed in claim 14, further comprising;
- carrying out the laundry disentangle alternately rotating step again to lower the eccentricity of the laundry below the preset value if the eccentricity of the laundry after the step (a) is greater than the preset value;
- carrying out the determining step again; and automatically stopping the washing if the eccentricity of the laundry is kept greater than the preset value until the foregoing steps are repeated for a preset times.
17. The method as claimed in claim 14, further comprising rotating the inner tub at 30-50 RPM to keep the laundry in the tilted inner tub spread evenly.
18. A method for controlling attenuation of vibration in a tilt-type washing machine having an inner tub, the method comprising, in the following order:
- a) alternately rotating the inner tub to disentangle laundry and eliminate eccentricity of laundry in the inner tub without water discharge and before a main water extraction and after a washing step or rinsing step; and
- b) determining if the eccentricity of the laundry after the alternately rotating is smaller than a preset value.
19. The method for controlling attenuation of vibration in a tilt-type washing machine as set forth in claim 18, and further alternately rotating the inner tub to disentangle laundry and eliminate eccentricity of the laundry in the inner tub before a main water extraction if the eccentricity of the laundry after the alternately rotating is greater than the preset value.
20. The method for controlling attenuation of vibration in a tilt-type washing machine as set forth in claim 19, and further determining if the eccentricity of the laundry after the alternately rotating is smaller than a preset value.
21. The method as claimed in claim 18, wherein the inner tub rotates alternately less than 10 times in the step (a).
22. The method as claimed in claim 18, further comprising;
- carrying out the laundry disentangle alternately rotating step again to drop the eccentricity of the laundry below the preset value if the eccentricity of the laundry after the step (a) is greater than the preset value;
- carrying out the determining step again; and
- automatically stopping the washing if the eccentricity of the laundry is kept greater than the preset value until the foregoing steps are repeated for a preset times.
23. The method as claimed in claim 18, further comprising rotating the inner tub at 30-50 RPM to keep the laundry in the tilted inner tub spread evenly.
24. A method for controlling attenuation of vibration in a tilt-type washing machine having an inner tub, the method comprising, in the following order:
- a) alternately rotating the inner tub to disentangle laundry and eliminate eccentricity of laundry in the inner tub without water discharge and before a main water extraction, and after a washing step or rinsing step and prior to a sensing of the eccentricity; and
- b) determining if the eccentricity of the laundry after the alternately rotating is smaller than a preset value.
25. The method for controlling attenuation of vibration in a tilt-type washing machine as set forth in claim 24 and further alternately rotating the inner tub to disentangle laundry and eliminate eccentricity of the laundry in the inner tub before a main water extraction if the eccentricity of the laundry after the alternately rotating is greater than the preset value.
26. The method for controlling attenuation of vibration in a tilt-type washing machine as set forth in claim 25, and further determining if the eccentricity of the laundry after the alternately rotating is smaller than a preset value.
27. The method as claimed in claim 24, wherein the inner tub rotates alternately less than 10 times in the step (a).
28. The method as claimed in claim 24, further comprising;
- carrying out the laundry disentangle alternately rotating step again to drop the eccentricity of the laundry below the preset value if the eccentricity of the laundry after the step (a) is greater than the preset value;
- carrying out the determining step again; and
- automatically stopping the washing if the eccentricity of the laundry is kept greater than the preset value until the foregoing steps are repeated for a preset times.
29. The method as claimed in claim 24, further comprising rotating the inner tub at 30-50 RPM to keep the laundry in the tilted inner tub spread evenly.
30. A method for controlling attenuation of vibration in a tilt-type washing machine having an inner tub, the method comprising:
- a) a main rotation step to exert a centrifugal force to laundry gathered to a center of the inner tub to spread the laundry to an inside wall of the inner tub before a main water extraction;
- b) a laundry disentangle alternately rotating step to alternately rotate the inner tub for a preset number of times without water discharge to disentangle the laundry spread to the inside wall of the inner tub; and
- c) a supplementary rotating step for rotating the inner tub at a preset RPM to keep the laundry in the tilted inner tub spread evenly, while concurrently discharging water.
31. A method for controlling attenuation of vibration in a tilt-type washing machine having an inner tub, the method comprising, in the following order:
- a) alternately rotating the inner tub to disentangle laundry and eliminate eccentricity of laundry in the inner tub without water discharge before a main water extraction, and after a washing step or rinsing step;
- b) determining if the eccentricity of the laundry after the alternately rotating is smaller than a preset value; and
- c) supplying water if the eccentricity of the laundry is less than the preset value.
32. The method as claimed in claim 31, further comprising a water discharge step before the step (c).
33. A method for controlling attenuation of vibration in a tilt-type washing machine having an inner tub, the method comprising, in the following order:
- a) alternately rotating the inner tub to disentangle laundry and eliminate eccentricity of laundry in the inner tub without water discharge before a main water extraction, and after a washing step or rinsing step;
- b) determining if the eccentricity of the laundry after the alternately rotating is smaller than a preset value;
- c) carrying out the step (a) again if the eccentricity of the laundry is greater than the preset value;
- d) carrying out the step (b) again; and
- e) automatically stopping the washing if the eccentricity of the laundry is kept greater than the preset value until the foregoing steps are repeated for a preset number of times.
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Type: Grant
Filed: Jun 10, 2004
Date of Patent: Jun 16, 2009
Assignee: LG Electronics Inc. (Seoul)
Inventors: Si Moon Jeon (Seoul), Young Hwan Park (Seoul), Oh Hun Kwon (Seoul), Kyung Hwan Kim (Seoul), Dong Won Kim (Seoul), Tae Hee Lee (Seoul)
Primary Examiner: Frankie L Stinson
Attorney: Greenblum & Bernstein, P.L.C.
Application Number: 10/864,919
International Classification: D06F 37/20 (20060101);