JP3891923B2 - Washing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a washing machine, and more particularly to a washing machine having a washing rotating body such as a rotating drum for storing laundry.
[0002]
[Prior art]
A conventional washing machine having a washing rotating body such as a rotating drum is disclosed in Patent Document 1, for example. The laundry is stored in the laundry rotator, and the laundry is agitated by the forward and reverse rotations of the laundry rotator. Thereby, washing and rinsing of the laundry are performed. At this time, as shown in FIG. 8 of Patent Document 1, since the forward rotation and the reverse rotation are performed at the same rotational speed, an acceleration having the opposite direction and the same magnitude is applied to the laundry rotating body during the reverse rotation.
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-276467 (pages 6-7, FIG. 8)
[0004]
[Problems to be solved by the invention]
FIG. 4 is a front view showing a conventional washing machine 1 in which a rotating drum 5 is installed horizontally. As shown in the figure, when the amount of the laundry W accommodated in the rotary drum 5 increases, the contact area between the laundry W and the rotary drum 5 increases, and the frictional force therebetween increases. For this reason, the so-called cloth change that the laundry W rotates integrally with the rotating drum 5 and the relative position of the laundry W and the rotating drum 5 changes hardly occurs. Therefore, there has been a problem that sufficient detergency cannot be obtained.
[0005]
An object of the present invention is to provide a washing machine capable of improving the cleaning power by generating a cloth change.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention includes a laundry rotating body that stores laundry and rotates in first and second rotation directions opposite to each other, and the laundry is rotated when reversed from the first rotation direction. the size of the first acceleration applied to the rotating body, much larger than the magnitude of the second acceleration applied to the washing rotary member when inverted from the second rotational direction, prior to adding the second acceleration, rotation the washing By applying a third acceleration that is the same direction and smaller in magnitude as the first acceleration for rotating the body at a constant speed, the laundry rotates at a different speed from the drum at the first acceleration, and then the third acceleration is increased. It is characterized by having time to become almost equal to the drum speed by adding .
[0007]
According to this configuration, for example, when the first acceleration is applied to the washing rotating body that is rotating in the forward direction, the rotating body is decelerated, reversed, and accelerated. Further, when a second acceleration smaller than the first acceleration is applied during reverse rotation, the vehicle decelerates and rotates forward and accelerates. When less than a predetermined amount of laundry is put into the laundry rotating body, the laundry is stirred by inertial force by applying the first and second accelerations. Further, when a larger amount of laundry is put into the laundry rotating body, the frictional force between the laundry and the laundry rotating body is more than the inertial force of the laundry when the second acceleration is applied. Largely, the laundry rotates integrally with the laundry rotating body. When the first acceleration is applied, the frictional force between the laundry and the laundry rotator becomes smaller than the inertial force of the laundry, and the laundry moves relative to the laundry rotator due to inertia. In the following description, when the magnitude of acceleration is described, it indicates the magnitude of the absolute value of acceleration.
[0008]
Also, after washing rotary body where the first acceleration is applied, it rotates the third acceleration is applied so as not to stop the load. At this time, the laundry rotating due to inertia gradually follows the laundry rotating body and accelerates.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. For convenience of explanation, the same parts as those in FIG. FIG. 1 is a perspective view showing a drum-type washing machine in which a rotating drum according to an embodiment is installed horizontally. The drum-type washing machine 1 can be opened and closed with an opening / closing door 3 at the front. An operation panel 11 having operation keys and a display unit is provided at the upper front of the drum type washing machine 1.
[0011]
FIG. 2 is a side sectional view of the drum-type washing machine 1. A drum-shaped washing machine 1 is provided with a bottomed cylindrical water tank 4 having an open front. A space between the periphery of the opening and the housing of the drum type washing machine 1 is sealed with a packing (not shown). A bottomed cylindrical drum 5 is disposed in the water tank 4.
[0012]
A bearing (not shown) is integrated with the water tank 4, and the drum 5 is rotatable by supporting a shaft portion 5a fixed to the drum 5 by the bearing. A rotor 6 a is fixed to the shaft portion 5 a of the drum 5, and a stator 6 b is attached to the water tank 4. Thereby, the motor 6 which rotationally drives the drum 5 is comprised. The operation panel 11 is provided with a controller 12 that controls the operation of the drum type washing machine 1.
[0013]
When the laundry is put into the drum 5 and the open / close door 3 is closed, the washing water is supplied into the water tank 4. A plurality of small holes (not shown) are provided in the peripheral wall of the drum 5, and when a predetermined amount of washing water is stored in the drum 5, the drum 5 rotates to perform a washing process and a rinsing process. Further, when the rinsing process is completed, the dewatering process is performed by rotating the drum 5 after drainage at a high speed.
[0014]
FIG. 3 is a time chart for controlling the rotation of the drum 5 during the washing process and the rinsing process. FIG. 3A shows the torque T applied to the drum 5. FIG. 3B shows the rotation speed N of the drum 5. FIG. 3C shows the relative angle θ between the drum 5 and the laundry. The acceleration applied to the drum 5 is proportional to the torque T.
[0015]
When the motor 6 is activated, an acceleration a2 (second acceleration) due to the torque T2 is applied to the drum 5 in the period A. As a result, the drum 5 accelerates in the forward rotation direction and reaches a predetermined rotational speed N1. At this time, since the torque T2 is set small, the magnitude of the acceleration a2 is small.
[0016]
When the amount of the laundry W is small, the relative position between the drum 5 and the laundry changes even when the acceleration a2 is small. As shown in FIG. 4 described above, when the amount of the laundry W is larger than a predetermined amount, the frictional force between the laundry W and the drum 5 is greater than the inertial force applied to the laundry W. For this reason, the laundry W rotates together with the drum 5.
[0017]
In the period B, an acceleration a1 (first acceleration) due to the torque T1 having a magnitude larger than the torque T2 is applied to the drum 5 in the opposite direction to the torque T2. As a result, the drum 5 decelerates and then accelerates in the reverse direction to reach a predetermined rotational speed N1. At this time, since the magnitude of the acceleration a1 is larger than the acceleration a2, even if the amount of the laundry W is large, the inertial force applied to the laundry becomes larger than the frictional force between the laundry W and the drum 5. Accordingly, as shown by the broken line E in FIG. 3B, the laundry W rotates at a different rotational speed from the drum 5 due to inertia, and the relative angle θ with the drum 5 changes as shown in FIG. 3C.
[0018]
In period C, acceleration a3 (third acceleration) due to torque T3 having a magnitude smaller than torque T1 in the same direction as torque T1 is applied to drum 5. As a result, the drum 5 is not stopped by the load but rotates at substantially constant speed. During this time, the laundry W is accelerated by the frictional force with the drum 5 and becomes substantially equal to the speed of the drum 5. The torque T3 is repeatedly increased and decreased by a small amount in order to maintain the constant speed rotation of the drum 5.
[0019]
In the period D, acceleration a2 due to the torque T2 is applied to the drum 5, and the drum 5 is decelerated and reversed to be accelerated in the forward rotation direction. At this time, the laundry W rotates integrally with the drum 5 by the frictional force. The laundry is washed and rinsed by repeating the above operation.
[0020]
According to the present embodiment, the acceleration a1 applied to the drum 5 when the drum 5 is reversed from the normal rotation is larger than the acceleration a2 applied when the drum 5 is reversed from the reverse rotation. The inertial force applied to the article W becomes larger than the frictional force between the laundry W and the drum 5, and the cloth change can be generated. Therefore, the cleaning power of the drum type washing machine 1 can be improved.
[0021]
In the present embodiment, the drum type washing machine 1 in which the drum 5 is provided horizontally is described, but the same effect can be obtained even in a vertical type washing machine in which a rotating washing tub is erected. .
[0022]
【The invention's effect】
According to the present invention, even if the amount of laundry is large, the inertial force applied to the laundry becomes larger than the frictional force between the laundry and the laundry rotating body, and cloth change can be generated. Therefore, the washing power of the washing machine can be improved.
[0023]
Also, the laundry can be rotated integrally with the washing濯物and washing rotary member after the washing to obtain a sufficient cleaning power by the fabric instead to reach a predetermined rotational speed.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a washing machine according to an embodiment of the present invention.
FIG. 2 is a schematic side sectional view showing the washing machine according to the embodiment of the present invention.
FIG. 3 is a time chart of the drum of the washing machine according to the embodiment of the present invention.
FIG. 4 is a diagram for explaining problems of a conventional washing machine.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Washing machine 3 Opening / closing door 4 Water tank 5 Drum 6 Motor 11 Operation panel 12 Control part

Claims (1)

A laundry rotating body for storing laundry and rotating in first and second rotational directions opposite to each other;
The size of the first acceleration applied to the laundry rotating body when the reversing from the first rotating direction, much larger than the magnitude of the second acceleration applied to the washing rotary member when inverted from the second rotational direction, Before applying the second acceleration, by applying a third acceleration having the same direction and a small size as the first acceleration for rotating the laundry rotating body at a constant speed, the laundry is moved to the drum at the first acceleration. A washing machine characterized by having a time approximately equal to the drum speed by applying a third acceleration after rotating at a different rotational speed .

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