JP2021101901A - Vertical type washing machine - Google Patents

Abstract

To provide a vertical type washing machine capable of achieving improvement in finish of laundry after a dewatering operation.SOLUTION: A vertical type washing machine 1 includes: a motor 6; a rotary tub 4 rotating by receiving a driving force of the motor 6; a rotary vane 5 arranged on a bottom wall 4B of the rotary tub 4 in the rotary tub 4, and rotating by receiving a driving force of the motor 6; and a control part 21 for rotating the rotary tub 4 and the rotary vane 5 by controlling the motor 6. The control part 21 executes: a dewatering operation for dewatering laundry Q in the rotary tub 4 by rotating the rotary tub 4 at predetermined dewatering rotational frequency; and a finish operation for finishing the laundry Q in the rotary tub 4 after the dewatering operation. During the finish operation, the control part 21 executes: peeling processing for peeling the laundry Q from an inner peripheral surface 4C of the rotary tub 4 by repeating the normal rotation and the reverse rotation of the rotary vane 5; and untangling processing of untangling the entanglement of the laundry Q in the rotary tub 4 by rotating the rotary tub 4 at rotational frequency lower than the dewatering rotational frequency after the peeling processing.SELECTED DRAWING: Figure 1

Description

The present invention relates to a vertical washing machine.

The vertical washing machine disclosed in Patent Document 1 below includes a washing / dehydrating tub, a pulsator provided at the bottom of the washing / dehydrating tub, and a motor for rotating each of the washing / dehydrating tub and the pulsator. When the dehydration operation is completed in the vertical washing machine, the washed clothes are entangled with each other and are compacted on the inner wall surface or the bottom of the washing / dehydrating tub. Therefore, in the vertical washing machine, a peeling process of peeling clothes from the washing / dehydrating tub and a loosening process of loosening entangled clothes are executed. In each of the peeling stroke and the loosening stroke, the pulsator rotates by repeating ON and OFF of the motor under different operating conditions for each of these strokes.

JP-A-2018-79061

Like the vertical washing machine of Patent Document 1, even if you try to remove the laundry from the washing / dehydrating tub or loosen the entangled clothes just by rotating the pulsator, it is particularly difficult to sufficiently unentangle the laundry. is there. Further, in a vertical washing machine, in a washing operation or a rinsing operation in which water is stored in a washing / dehydrating tub, a method is known in which a pulsator is rotated at a timing before drainage to generate a water flow, and the laundry is loosened by this water flow. Even with this method, it is difficult to sufficiently loosen the entanglement of the laundry. If the entanglement of the laundry is not unraveled, deep wrinkles will remain in the laundry and the finish of the laundry will be impaired.

The present invention has been made under such a background, and an object of the present invention is to provide a vertical washing machine capable of improving the finish of laundry after dehydration operation.

The present invention has a driving means for generating a driving force, an upper end portion where an entrance / exit for laundry is formed, and a lower end portion provided with a bottom wall, and the rotation is rotated by receiving the driving force of the driving force. A tank, a rotary blade arranged on the bottom wall in the rotary tank and rotating by receiving a driving force of the drive means, and a control for rotating the rotary tank and the rotary blade by controlling the drive means. As a means, a dehydration operation of dehydrating the laundry in the rotary tub by rotating the rotary tub at a predetermined dehydration rotation speed and a finishing operation of finishing the laundry in the rotary tub after the dehydration operation are performed. The control means includes a control means to be executed, and the control means has a peeling process of peeling the laundry from the inner peripheral portion of the rotary tub by repeating forward rotation and reverse rotation of the rotary blade during the finishing operation, and the peeling process. It is a vertical washing machine that later performs a loosening process of loosening the entanglement of laundry in the rotary tub by rotating the rotary tub at a loosening rotation speed lower than the dehydration rotation speed.

Further, the present invention is characterized in that the unraveling rotation speed is 150 rpm or more and 350 rpm or less.

Further, in the present invention, the control means brings the laundry in the rotary tub closer to the rotation center side of the rotary tub by repeating the forward rotation and the reverse rotation of the rotary blade after the loosening treatment during the finishing operation. It is characterized by executing the final processing.

According to the present invention, in the vertical washing machine, the laundry in the rotary tub is dehydrated by the strong centrifugal force generated by the rotation of the rotary tub at the dehydration rotation speed in the dehydration operation. It is assumed that a plurality of laundry items in the rotary tub are intertwined and stuck to the inner peripheral portion of the rotary tub. Therefore, in the vertical washing machine, after the dehydration operation, a finishing operation for finishing the laundry in the rotary tub is executed. During the finishing operation, first, a peeling process is executed, and in the peeling process, the laundry is peeled from the inner peripheral portion of the rotary tub by the rotary blades that repeat the forward rotation and the reverse rotation. The loosening treatment is executed after the peeling treatment, and in the loosening treatment, a centrifugal force weaker than that during the dehydration operation is generated by rotating the rotary tank at a loosening rotation speed lower than the dehydration rotation speed. A plurality of laundry items that have been peeled off from the inner circumference of the rotary tub but are in an entangled state are separated by being pulled by this centrifugal force, so that the entanglement between the plurality of laundry items can be effectively disentangled. .. Since deep wrinkles are less likely to remain on the untangled laundry, it is possible to improve the finish of the laundry after the dehydration operation.

Further, according to the present invention, in the loosening process, the rotary tub rotates at a loosening rotation speed of 150 rpm or more and 350 rpm or less, so that the laundry in the rotary tub is loosened without sticking to the inner peripheral portion of the rotary tub. It is possible to generate a centrifugal force having a strength suitable for the above.

Further, according to the present invention, during the finishing operation, the final treatment is executed after the loosening treatment, and in the final treatment, the laundry in the rotary tub is brought closer to the rotation center side of the rotary tub by the rotary blades that repeat forward rotation and reverse rotation. Be done. Therefore, the laundry in the rotary tub after the final treatment is arranged at a position on the rotation center side of the rotary tub so that it can be easily taken out in a state where the entanglement is loosened, so that the user can easily take out the laundry in the rotary tub. be able to.

It is a typical vertical cross-sectional right side view of the vertical washing machine which concerns on one Embodiment of this invention. It is a block diagram which shows the electric structure of a vertical washing machine. It is a flowchart which shows the finishing operation performed in a vertical washing machine. It is a top view of the rotary tub of a vertical washing machine immediately after the completion of the dehydration operation. It is a top view of the rotary tank immediately after the completion of the peeling process in the finishing operation. It is a top view of the rotary tank immediately after the completion of the loosening process in the finishing operation. It is a top view of the rotary tank immediately after the completion of the final processing in the finishing operation.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. FIG. 1 is a schematic vertical cross-sectional right side view of the vertical washing machine 1 according to the embodiment of the present invention. The direction orthogonal to the paper surface of FIG. 1 is referred to as the left-right direction X of the vertical washing machine 1, the left-right direction in FIG. 1 is referred to as the front-rear direction Y of the vertical washing machine 1, and the vertical direction in FIG. 1 is referred to as the vertical washing machine 1. It is called the vertical direction Z of. Of the left-right directions X, the back side of the paper surface of FIG. 1 is referred to as the left side X1 of the vertical washing machine 1, and the front side of the paper surface of FIG. 1 is referred to as the right side X2 of the vertical washing machine 1. Of the front-rear direction Y, the left side in FIG. 1 is referred to as the front side Y1, and the right side in FIG. 1 is referred to as the rear side Y2. Of the vertical directions Z, the upper side is referred to as the upper side Z1 and the lower side is referred to as the lower side Z2.

The vertical washing machine 1 includes a housing 2, an outer tub 3 arranged in the housing 2, a rotary tub 4 housed in the outer tub 3, and a rotary wing arranged in the lower part of the rotary tub 4. 5, an electric motor 6 as an example of a driving means for generating a driving force for rotating the rotary tank 4 and the rotary blade 5, and an electric transmission mechanism for transmitting the driving force of the motor 6 to the rotary tank 4 and the rotary blade 5. 7 and is included.

The housing 2 is made of metal, for example, and is formed in a box shape. An opening 2B is formed in the upper surface portion 2A of the housing 2 to communicate the inside and outside of the housing 2. A door 8 for opening and closing the opening 2B is provided on the upper surface portion 2A. A display operation unit 9 composed of a switch, a liquid crystal panel, or the like is provided in a region of the upper surface portion 2A on the front side Y1 of the opening 2B, for example. By operating the switch of the display operation unit 9, the user can freely select the operating conditions of the vertical washing machine 1 and instruct the vertical washing machine 1 to start or stop the operation. can do. Information on the operation of the vertical washing machine 1 is visually displayed on the liquid crystal panel of the display operation unit 9.

The outer tank 3 is made of resin, for example, and is formed in a bottomed cylindrical shape. The outer tank 3 is connected to the housing 2 via a support member 10 such as a suspension rod or a shock absorber having a spring and a damping mechanism, and is elastically supported by the support member 10. The outer tank 3 has a substantially cylindrical circumferential wall 3A arranged along the vertical direction Z, a bottom wall 3B that closes the hollow portion of the circumferential wall 3A from the lower Z2, and an edge of the circumferential wall 3A on the upper Z1 side. It has a ring-shaped annular wall 3C protruding toward the center of the circle of the circumferential wall 3A while edging. Inside the annular wall 3C, an entrance / exit 3D communicating from the upper side Z1 is formed in a hollow portion of the circumferential wall 3A. The doorway 3D faces the opening 2B of the housing 2 from the lower side Z2 and communicates with the opening 2B. The annular wall 3C is provided with a door 11 that opens and closes the doorway 3D. The bottom wall 3B is formed in a disk shape extending substantially horizontally, and a through hole 3E penetrating the bottom wall 3B is formed at the center position of the circle of the bottom wall 3B.

Water is stored in the outer tank 3. A water supply channel 12 connected to a tap water faucet is connected to the outer tank 3 from the upper side Z1, and tap water is supplied into the outer tank 3 from the water supply channel 12. A water supply valve 13 that is opened and closed to start and stop water supply is provided in the middle of the water supply channel 12. A drainage channel 14 is connected to the outer tank 3 from the lower side Z2, and the water in the outer tank 3 is discharged to the outside of the machine from the drainage channel 14. A drain valve 15 that opens and closes to start and stop drainage is provided in the middle of the drainage channel 14.

The rotary tub 4 is made of metal, for example, and is formed in a bottomed cylindrical shape that is one size smaller than the outer tub 3, and can accommodate the laundry Q inside. The rotary tank 4 has a substantially cylindrical circumferential wall 4A arranged along the vertical direction Z, and a bottom wall 4B that closes the hollow portion of the circumferential wall 4A from the lower side Z2.

The inner peripheral surface 4C of the circumferential wall 4A constitutes the inner peripheral portion of the rotary tank 4. The upper end portion of the inner peripheral surface 4C forms the upper end portion 4D of the entire rotary tank 4. The upper end portion 4D of the rotary tank 4 is formed with a doorway 4E bordered by the upper end portion of the inner peripheral surface 4C. The doorway 4E exposes the hollow portion of the circumferential wall 4A to the upper side Z1. The doorway 4E faces the doorway 3D of the outer tank 3 from the lower side Z2 and communicates with the doorway 3D. The doorway 3D and the doorway 4E are collectively opened and closed by the door 11. The user of the vertical washing machine 1 puts the laundry Q in and out of the rotary tub 4 through the open opening 2B, the doorway 3D, and the doorway 4E.

The rotary tank 4 is coaxially housed in the outer tank 3. The outer tub 3 and the rotary tub 4 form a washing tub 16. The entire washing tub 16 is elastically supported by the support member 10. The rotary tank 4 housed in the outer tank 3 is rotatable about an axis J extending in the vertical direction Z along its central axis. Further, a plurality of through holes (not shown) are formed in at least one of the circumferential wall 4A and the bottom wall 4B of the rotary tank 4, and the water in the outer tank 3 passes through the through holes to the outer tank 3 and the rotary tank. You can go back and forth with 4. Therefore, the water level in the outer tank 3 and the water level in the rotary tank 4 match.

The bottom wall 4B of the rotary tank 4 is a lower end portion of the rotary tank 4, and is formed in a disk shape extending substantially parallel to the bottom wall 3B of the outer tank 3 on the upper side Z1 at intervals. A through hole 4F penetrating the bottom wall 4B is formed at the center position of the circle on the bottom wall 4B that coincides with the axis J. The bottom wall 4B is provided with a tubular support shaft 17 extending to the lower side Z2 along the axis J while surrounding the through hole 4F. The support shaft 17 is inserted through the through hole 3E of the bottom wall 3B of the outer tank 3, and the lower end portion of the support shaft 17 is located in Z2 below the bottom wall 3B.

The rotary blade 5 is a so-called pulsator, is formed in a disk shape centered on the axis J, and is arranged coaxially with the rotary tank 4 on the bottom wall 4B in the rotary tank 4. A plurality of blades 5A arranged radially around the axis J are provided on the upper surface of the rotary blade 5 facing the entrance / exit 4E of the rotary tank 4. Each blade 5A is a raised portion that rises to the upper side Z1 while extending in the radial direction R with respect to the axis J. The rotary blade 5 is provided with a rotary shaft 18 extending from the center of the circle to the lower side Z2 along the axis J. The rotating shaft 18 is inserted through the hollow portion of the support shaft 17, and the lower end portion of the rotating shaft 18 is located in Z2 below the bottom wall 3B of the outer tank 3.

The motor 6 is composed of, for example, an inverter motor. The motor 6 is arranged in the lower Z2 of the outer tank 3 in the housing 2. The motor 6 has an output shaft 19 that rotates about an axis J. The transmission mechanism 7 is interposed between the lower ends of the support shaft 17 and the rotary shaft 18 and the upper end of the output shaft 19.

The transmission mechanism 7 selectively transmits the driving force output from the output shaft 19 by the motor 6 to one or both of the support shaft 17 and the rotating shaft 18. A known transmission mechanism 7 is used. In this embodiment, the motor 6 and the transmission mechanism 7 are fixed to the outer tank 3, but the motor 6 is fixed to the housing 2 and the driving force of the motor 6 is supported from the transmission mechanism 7 via a transmission member such as a belt. It may be transmitted to the shaft 17 or the rotating shaft 18. When the driving force of the motor 6 is transmitted to the support shaft 17, the rotary tank 4 receives the driving force of the motor 6 and rotates around the support shaft 17. When the driving force of the motor 6 is transmitted to the rotating shaft 18, the rotary blade 5 receives the driving force of the motor 6 and rotates around the rotating shaft 18. In this embodiment, the rotation direction of the motor 6, that is, the rotation direction of the output shaft 19, and the rotation direction of each of the rotary tank 4 and the rotary blade 5 coincide with each other.

FIG. 2 is a block diagram showing an electrical configuration of the vertical washing machine 1. The vertical washing machine 1 includes a control unit 21 as an example of the control means. The control unit 21 is configured as a microcomputer including, for example, a CPU 22, a memory 23 such as a ROM or RAM, and a timer 24 for timing, and is built in the housing 2 (see also FIG. 1).

The vertical washing machine 1 further includes a water level sensor 25 and a rotation speed sensor 26. The motor 6, the transmission mechanism 7, the water supply valve 13, the drain valve 15, the display operation unit 9, the water level sensor 25, and the rotation speed sensor 26 are each electrically connected to the control unit 21.

The control unit 21 controls the rotation of the motor 6 to generate a driving force in the motor 6 or stop the rotation of the motor 6. By controlling the transmission mechanism 7, the control unit 21 switches the transmission destination of the driving force of the motor 6 to one or both of the support shaft 17 and the rotation shaft 18. When the driving force of the motor 6 is transmitted to the support shaft 17, the rotary tank 4 rotates. When the driving force of the motor 6 is transmitted to the rotating shaft 18, the rotary blade 5 rotates. In this way, the control unit 21 rotates the rotary tank 4 and the rotary blade 5 by controlling the motor 6 and the transmission mechanism 7. Further, the control unit 21 can rotate the motor 6 in the forward direction or in the reverse direction by controlling the rotation direction of the motor 6. The rotary tank 4 and the rotary blade 5 that receive the driving force of the motor 6 that rotates in the normal direction rotate in the clockwise direction in a plan view, for example. The rotary tank 4 and the rotary blade 5 that have received the driving force of the reversing motor 6 reverse in the counterclockwise direction, for example, in a plan view.

The control unit 21 controls the opening and closing of the water supply valve 13 and the drain valve 15. When the water supply valve 13 is opened with the drain valve 15 closed by the control unit 21, water is supplied to the washing tub 16 and water is collected. When the control unit 21 opens the drain valve 15, the washing tub 16 is drained. When the user operates the display operation unit 9 to select the dehydration condition of the laundry Q, the control unit 21 accepts the selection. The control unit 21 controls the display of the display operation unit 9.

The water level sensor 25 is a sensor that detects the water level of the washing tub 16, that is, the water levels of the outer tub 3 and the rotary tub 4, and the detection result of the water level sensor 25 is input to the control unit 21 in real time. The rotation speed sensor 26 is a device that detects the rotation speed of the motor 6, strictly speaking, the rotation speed of the output shaft 19 in the motor 6, and is composed of, for example, a Hall IC. The rotation speed read by the rotation speed sensor 26 is input to the control unit 21 in real time. The control unit 21 rotates the motor 6 at a desired rotation speed by controlling the duty ratio of the voltage applied to the motor 6, for example, based on the input rotation speed. In this embodiment, the rotation speed of the rotary tank 4 is the same as the rotation speed of the motor 6, and the rotation speed of the rotary blade 5 is a predetermined constant such as a reduction ratio in the transmission mechanism 7 as the rotation speed of the motor 6. It is a value obtained by multiplying. In any case, the rotation speed sensor 26 also detects the rotation speeds of the rotary tank 4 and the rotary blade 5 by detecting the rotation speeds of the motor 6.

Next, the washing operation, the rinsing operation, and the dehydration operation executed by the control unit 21 in the vertical washing machine 1 will be described. The vertical washing machine 1 is not limited to a general vertical washing machine that performs a washing operation, a rinsing operation, and a dehydration operation in this order, but also a vertical washing / drying machine that also performs a drying operation for drying the laundry Q. Although included, the description of the drying operation will be omitted below.

In the washing operation, the control unit 21 supplies water to the washing tub 16 for a predetermined time, and the motor 6 rotates only the rotary blade 5. As a result, the laundry Q in the rotary tub 4 is washed by being agitated by the blades 5A of the rotating rotary blade 5 or by decomposing the dirt by the detergent put into the rotary tub 4 before the start of the washing operation. Will be done. In the rinsing operation after the washing operation, the control unit 21 supplies water to the washing tub 16 for a predetermined time, and the motor 6 rotates only the rotary blade 5. As a result, the laundry Q in the rotary tub 4 is sooted by the stream of tap water generated in the rotary tub 4 by the rotating rotary blades 5. The rinsing operation may be performed multiple times.

In the dehydration operation, the control unit 21 rotates the rotary tank 4 and the rotary blade 5 at high speed. Specifically, the control unit 21 gradually turns on the motor 6 to increase the rotation speed of the motor 6, and finally, a predetermined dehydration rotation in which the rotation speed of the motor 6 is, for example, 800 rpm or more and 1000 rpm or less. After raising the number to a certain number, the motor 6 is controlled so as to rotate at the dehydration rotation speed. As a result, the rotary tank 4 and the rotary blade 5 also rotate at the dehydration speed. Due to the strong centrifugal force generated by this rotation, the laundry Q in the rotary tub 4 moves to the outside in the radial direction R and is pressed against the inner peripheral surface 4C of the rotary tub 4 to be dehydrated. The drain valve 15 during the dehydration operation is in an open state, and the water exuded from the laundry Q due to the dehydration is discharged through the drainage channel 14. When the steady rotation of the rotary tank 4 at the dehydration speed continues for a predetermined time, the control unit 21 turns off the motor 6 and stops the rotation of the motor 6. As a result, the dehydration operation is completed. The dehydration operation may include an intermediate dehydration operation performed between the washing operation and the rinsing operation, and a final dehydration operation performed after the final rinsing operation.

At the end of the dehydration operation, more specifically, the final dehydration operation, it is assumed that a plurality of laundry Qs in the rotary tub 4 are intertwined and stuck to the inner peripheral surface 4C of the rotary tub 4 (FIG. to be described later). 4). The laundry Q in this state is difficult to take out from the rotary tub 4, and it is difficult to untie the entangled laundry Qs. If the entangled laundry Q is left as it is, deep wrinkles remain on the laundry Q and the finish of the laundry Q is impaired. Therefore, the entangled laundry Q needs to be unwound early. Therefore, after the dehydration operation, the control unit 21 executes a finishing operation for finishing the laundry Q in the rotary tub 4. FIG. 3 is a flowchart showing a finishing operation executed by the vertical washing machine 1. The finishing operation includes a peeling process, a loosening process after the peeling process, and a final process after the loosening process, and the control unit 21 executes these processes in order during the finishing operation.

In the peeling process, the control unit 21 controls the motor 6 and the transmission mechanism 7 to transmit the driving force of the motor 6 only to the rotor 5, and inverts the rotor 5 by repeating ON and OFF of the motor 6. (Step S1). The reversal of the rotary blade 5 means that the rotary blade 5 repeats forward rotation and reverse rotation. The rotation speed of the motor 6 when the rotary blade 5 is rotating is, for example, 500 rpm to 700 rpm. The reversing rotary blade 5 scrapes the laundry Q attached to the inner peripheral surface 4C of the rotary tub 4 along the circumferential direction P around the axis J in an entangled state, thereby causing the laundry Q from the inner peripheral surface 4C. Peel off. When the control unit 21 repeats the reversal of the rotor 5 for a predetermined time, the control unit 21 stops the reversal of the rotor 5 by stopping the motor 6 (step S2). As a result, the peeling process is completed. At the end of the peeling process, the laundry Q peeled off from the inner peripheral surface 4C in the rotary tub 4 is in a state of being gathered on the rotation center side of the rotary tub 4, that is, on the axis J side (see FIG. 5).

In the loosening process after the peeling process, the control unit 21 controls the motor 6 and the transmission mechanism 7 to transmit the driving force of the motor 6 to the rotary tank 4 and the rotary blade 5, and the loosening rotation speed is lower than the dehydration rotation speed. Rotates the rotary tank 4 at a low speed (step S3). As a result, a centrifugal force weaker than that during the dehydration operation is generated in the rotary tank 4. A plurality of laundry Qs (see FIG. 5) that have been peeled off from the inner peripheral surface 4C of the rotary tub 4 by the peeling process but are in an entangled state are separated by being pulled by this centrifugal force and spread, so that the rotary tub 4 is separated. It is possible to effectively disentangle the entanglement between the plurality of laundry Qs in the room. During the loosening process, the rotary blade 5 rotates integrally with the rotary tank 4.

When the timer 24 measures that a predetermined time has elapsed from the start of the low-speed rotation of the rotary tank 4 at the loosening rotation speed (step S3), the control unit 21 stops the rotation of the rotary tank 4 by stopping the motor 6. (Step S4). As a result, the loosening process is completed. At the end of the loosening treatment, the loosened laundry Q is in a state of being slightly moved to the outside of the radial direction R, that is, to the inner peripheral surface 4C side of the rotary tub 4 due to the centrifugal force generated during the loosening treatment (see FIG. 6). ..

In the final process after the loosening process, the control unit 21 controls the motor 6 and the transmission mechanism 7 to transmit the driving force of the motor 6 only to the rotor 5, and invert the rotor 5 (step S5). The rotation speed of the motor 6 at the time of rotation of the rotary blade 5 may be the same as the rotation speed of the motor 6 at the time of rotation of the rotary blade 5 in the peeling process, or may be smaller than that in the case of the peeling process. The reversing rotary blade 5 brings the laundry Q, which has moved to the outside in the radial direction R by the loosening process, toward the rotation center side of the rotary tub 4. When the control unit 21 repeats the reversal of the rotor 5 for a predetermined time, the control unit 21 stops the reversal of the rotor 5 by stopping the motor 6 (step S6). As a result, the final processing is completed.

Since, for example, an operation time of 3 minutes is set for the finish operation, from the start of the finish operation, that is, from the start of the reversal of the rotor 5 in step S1 to the elapse of the operation time (NO in step S7), The control unit 21 repeats the peeling process, the loosening process, and the final process in this order. If the timer 24 measures that the operation time has elapsed at the end of the final processing (YES in step S7), the control unit 21 ends the finishing operation. After the finishing operation is completed, that is, after the final final treatment, the laundry Q in the rotary tub 4 is arranged in a position where it can be easily taken out on the rotation center side of the rotary tub 4 in a state where the entanglement is loosened (see FIG. 7). The user can easily take out the laundry Q in the rotary tub 4.

Further, in the finishing operation, the laundry Q is peeled off from the inner peripheral surface 4C of the rotary tub 4 by the peeling treatment, and then loosened by the loosening treatment so as not to be entangled with other laundry Q. Deep wrinkles are unlikely to remain on the laundry Q taken out. Therefore, the finish of the laundry after the dehydration operation can be improved.

Specifically, the loosening rotation speed in the loosening treatment is 150 rpm or more and 350 rpm or less. By rotating the rotary tub 4 at the loosening rotation speed determined in this way, the laundry Q in the rotary tub 4 has a strength suitable for loosening without sticking to the inner peripheral surface 4C of the rotary tub 4. Centrifugal force can be generated.

By the way, when the loosening rotation speed is less than 150 rpm, the centrifugal force is too weak, and it is difficult to separate the laundry Q from each other. On the other hand, when the unraveling rotation speed exceeds 350 rpm, the centrifugal force is strong, so that the laundry Q reattaches to the inner peripheral surface 4C of the rotary tub 4 as in the dehydration operation (see FIG. 4). In that case, in order to peel the laundry Q from the inner peripheral surface 4C, it is necessary to extend the processing time of the next final treatment and the processing time of the peeling treatment again. If the processing time of the final treatment or the peeling treatment is long, the laundry Q may be damaged due to the long contact time between the laundry Q and the rotary blade 5. However, by setting the loosening rotation speed to 150 rpm or more and 350 rpm or less, it is possible to suppress the sticking of the laundry Q to the inner peripheral surface 4C of the rotary tub 4 and shorten the processing time of the final processing and the peeling processing. , Damage to laundry Q can be reduced. Further, in the peeling process or the final process, if the rotary blade 5 is rotated in only one of the forward rotation direction and the reverse rotation direction, the laundry Q may be twisted. By reversing, the twist of the laundry Q can be suppressed.

The present invention is not limited to the embodiments described above, and various modifications can be made within the scope of the claims.

For example, the axis J, which is the center of rotation of the rotary tank 4, extends vertically in this embodiment, but may be arranged so as to be inclined with respect to the vertical direction. Further, in the finishing operation, the final processing may be omitted.

1 Vertical washing machine 4 Rotorcraft 4B Bottom wall 4C Inner peripheral surface 4D Upper end 4E Doorway 5 Rotorcraft 6 Motor 21 Control unit Q Laundry

Claims (3)

The driving means that generates the driving force and
A rotary tub that has an upper end portion where an entrance / exit for laundry is formed and a lower end portion provided with a bottom wall and rotates by receiving a driving force of the driving means.
A rotary blade arranged on the bottom wall in the rotary tank and rotating by receiving the driving force of the driving means, and
A control means for rotating the rotary tub and the rotary blade by controlling the drive means, and a dehydration operation for dehydrating the laundry in the rotary tub by rotating the rotary tub at a predetermined dehydration rotation speed. And a control means for executing the finishing operation of finishing the laundry in the rotary tub after the dehydration operation.
During the finishing operation, the control means has a peeling process of peeling the laundry from the inner peripheral portion of the rotary tub by repeating forward rotation and reverse rotation of the rotary blade, and a dehydration rotation of the rotary tub after the peeling treatment. A vertical washing machine that performs a loosening process for loosening the entanglement of laundry in the rotary tub by rotating the laundry at a loosening rotation speed lower than the number. The vertical washing machine according to claim 1, wherein the loosening rotation speed is 150 rpm or more and 350 rpm or less. During the finishing operation, the control means executes a final process of bringing the laundry in the rotary tub closer to the rotation center side of the rotary tub by repeating the forward rotation and the reverse rotation of the rotary blade after the loosening process. The vertical washing machine according to claim 1 or 2.

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