JP2000325688A - Drum type washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drum type washing capable of improving the drying efficiency. SOLUTION: In this drum type washing machine provided with a water tank 4 disposed with the front surface opened in a washing machine main body 1, a rotary drum 5 having a number of holes 5a on the circumferential surface and rotatably supported in the water tank 4, a control circuit to control rotation of the rotary drum 5, and a blow means 10 to blow hot air from an opening part 5b of the rotary drum 5 into the rotary drum 5, the rotary drum 5 in a drying process is controlled by a rotation chart having plurality of at least either of rotation speed absolute values and reverse rotation periods.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved drum-type washing machine having a drying function and having a horizontal rotating drum which rotates with a substantially horizontal axis.

[0002]

2. Description of the Related Art A drum type washing machine having a horizontal rotating drum rotating about a horizontal axis is widely used, especially in Europe. In general, a drum-type washing machine has been commercialized in which washing is performed by rotating a rotating drum at a low speed, washing is performed including a rinsing process, and dehydrating is performed at a high speed, and then a drying process is further performed.

FIG. 10 is a side sectional view of a conventional drum type washing machine. As shown in FIG. 1, the drum type washing machine has a water tub 4 inside a washing machine main body 1 provided with a laundry input opening 2 which is opened and closed by an opening / closing door 3 on a front surface thereof. . A rotating drum 5 is supported in the water tub 4 so as to rotate about an inclined shaft portion 6, and the drum type washing machine has a double structure.

[0004] The upper portion of the water tub 4 is suspended from the washing machine body 1 by four pulling springs (not shown), and the lower portion is supported by four vibration isolating damper mechanisms (not shown). Thus, the water tub 4 is elastically supported in the main body 1 of the washing machine. The rotating drum 5 has a rotor 7 a fixed to the shaft 6.
The rotor 7a is rotatably driven by a drive motor 7 including a stator 7b provided on the back wall of the water tank 4 so as to surround the rotor 7a.

A ventilation duct 8 is provided between the upper edge of the front part of the water tank 4 and the lower part of the back wall. A cooler 9, a blower 10, and a heater 11 are provided inside the blower duct 8, and the blower 10
Is driven, hot air is sent into the rotary drum 5 as shown by arrows f1 and f2. The air in the rotary drum 5 flows through the small holes 5a provided in the peripheral wall into the air duct 8 as shown by arrows f3 and f4 and circulates.

In the above configuration, the washing process, the rinsing process, and the dehydrating process are sequentially performed by putting the laundry and the washing liquid into the rotating drum 5 and rotating the rotating drum 5 with the drive motor 7. When the blower 10 is driven after the completion of the dehydration step, the air in the water tank 4 and the rotating drum 5 is
Circulates through. The air containing water is condensed by the cooler 9 and dried, and then heated by the heater 11 to become hot air to dry the laundry in the rotating drum 5.

[0007]

In such a conventional drum-type washing machine with a drying function, hot air is fed into the rotary drum 5 while stirring the laundry in the rotary drum 5 and circulated repeatedly to dry the laundry. Therefore, it is important that the laundry is always dispersed and the hot air efficiently contacts the laundry and passes through the rotating drum 5. However, when the rotating drum 5 rotates at a constant rotation speed, the laundry rotates in the same form. For this reason, there is a problem that the hot air comes into contact with the same location of the laundry and the hot air does not evenly hit the entire laundry, resulting in poor drying efficiency.

FIG. 11 shows a front view of the rotating drum 5. When the rotating drum 5 rotates, the laundry W is transferred to the rotating drum 5.
And a cavity 5c is formed on the other side in one direction. When such a cavity 5c is generated, the hot air flowing from the opening of the rotating drum 5 passes through the cavity 5c without the laundry W and does not sufficiently absorb the moisture of the laundry. Is released to the outside.

When the rotary drum 5 is provided so as to be inclined so that the depth is lower as described above, the laundry tends to concentrate on the depth of the rotary drum 5 and the vicinity of the opening on the front face of the rotary drum 5 A similar hollow portion 5c is generated. Therefore, FIG.
As indicated by the arrow, the hot air is discharged to the outside of the rotary drum 5 without sufficiently absorbing the moisture of the laundry as in the above. Therefore, there is a problem that the drying efficiency is further deteriorated.

[0010] An object of the present invention is to provide a drum type washing machine capable of improving the drying efficiency.

[0011]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a water tub having a front surface opened inside a washing machine main body, a large number of small holes in a peripheral wall surface, and a water tub inside the water tub. A drum-type washing machine comprising: a rotatable drum rotatably supported; a control circuit for controlling the rotation of the rotatable drum; and a blowing means for sending hot air from the opening of the rotatable drum into the rotatable drum. The rotary drum at the time of the drying step is controlled by a rotation chart having a plurality of at least one of an absolute value of a speed and an inversion cycle.

According to this configuration, the rotating drum is rotated forward and reverse during the drying step by the rotation chart in which the rotating patterns of the rotating drum and the rotating patterns having different reversal periods are combined, so that the laundry is rotated irregularly and stirred. Becomes

Further, the present invention is characterized in that, in the drum-type washing machine having the above-mentioned structure, the water tub and the rotary drum have their opening side inclined at a predetermined angle above the bottom wall side.

Further, the present invention is characterized in that in the drum-type washing machine having the above-described structure, a plurality of the rotation charts having different rotation speeds or reversal periods can be selected.
According to this configuration, each of the drying courses such as a blanket course, a lingerie course, and a cotton course is selected according to the type of the laundry, and the laundry is agitated by a rotation suitable for the type of the laundry during the drying process. .

Further, the present invention is characterized in that in the drum-type washing machine having the above-described structure, the rotation speed of the rotary drum in the drying step is lower than that in the washing step. According to this configuration, by setting the rotation speed of the rotating drum during the drying process to be lower than that during the washing process, the laundry having reduced moisture due to dehydration does not stick to the inner wall of the rotating drum due to centrifugal force. Easily dispersed within.

Further, the present invention is characterized in that in the drum-type washing machine having the above-described structure, the rotation speed of the rotary drum during the drying step is set to 80% or less of the critical rotation speed.

According to the present invention, in the drum-type washing machine having the above-mentioned structure, the rotating drum in the drying step is set so that the rotation speed is set to 50% or more of the total rotation time in the drying step to 80% or less of the critical rotation speed. It is characterized by doing.

The present invention also relates to the drum-type washing machine having the above-mentioned structure, wherein an opening area of the small hole per unit area of a peripheral wall surface of the rotary drum is changed in an axial direction or a circumferential direction of the rotary drum. Features. According to this configuration, the amount of hot air flowing out of the small holes of the rotating drum changes in the depth direction of the rotating drum, and the hot air can be sent to a desired portion in the rotating drum.

The present invention also relates to a drum type washing machine having the above-mentioned structure, wherein the opening area of the small hole per unit area of the peripheral wall surface of the rotary drum is larger in the vicinity of the bottom wall than in the vicinity of the opening of the rotary drum. It is characterized by doing. According to this configuration, the dry hot air that flows into the rotary drum from the front of the rotary drum has a small amount of outflow to the outside of the rotary drum in front of the rotary drum having a small opening ratio of the small holes, and the deep portion where the flow rate is large. Flows to

The present invention also relates to the drum type washing machine having the above-mentioned structure, wherein the opening area of the small hole per unit area of the peripheral wall surface of the rotary drum in a range not more than a predetermined dimension in the axial direction from the opening end of the rotary drum. Is set to 50% or less of the opening area in the range of the predetermined dimension or more.

Further, the present invention is characterized in that in the drum type washing machine having the above-mentioned structure, the same opening pattern comprising a plurality of small holes is formed at predetermined intervals in the circumferential direction of the rotating drum.

Further, the present invention is characterized in that in the drum type washing machine having the above structure, a small hole is provided in a bottom wall of the rotating drum. According to this configuration, the dry hot air flowing into the rotary drum from the front of the rotary drum flows over the bottom wall of the rotary drum.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. For convenience of explanation, the same parts as those in FIG. 10 of the conventional example are denoted by the same reference numerals. 1 and 2 are a schematic perspective view and a side sectional view showing a drum type washing machine according to one embodiment. In the drum type washing machine, a water tub 4 is provided inside a washing machine main body 1 provided with a laundry input opening 2 which is opened and closed by an opening / closing door 3 on a front surface. A rotating drum 5 is supported in the water tub 4 so as to rotate about a shaft 6, and the drum type washing machine has a double structure.

The upper part of the water tub 4 is suspended from the washing machine main body 1 by four tension springs (not shown), and the lower part is supported by four vibration isolating damper mechanisms (not shown). Thereby, the water tub 4 is elastically supported in the main body 1 of the washing machine. The rotary drum 5 is driven to rotate by a drive motor 7 including a rotor 7a fixed to the shaft 6 and a stator 7b provided on the back wall of the water tank 4 so as to surround the rotor 7a.

During the rotation of the rotary drum 5, the door 3 is automatically locked. Further, when the door 3 is closed, a packing 12 made of an elastic material such as rubber and the like fitted to the inner wall of the laundry inlet 2 is tightly sealed to the periphery of the door 3. .

The rotating drum 5 supplies water to the entire peripheral wall during washing,
A number of small holes 5a for drainage during dehydration are provided, and a fluid balancer 26 is fixed to the outer peripheral edge of the opening 5b. Further, as shown in the figure, the rotating drums 5 are both inclined with a depression angle of θ with respect to the horizontal, so that the laundry in the back can be seen clearly. In the present embodiment, the opening / closing door 3 is formed perpendicular to the axis Y-Y of the rotary drum 5, but may be provided perpendicular to the horizontal direction.

An operation panel 13 provided with operation keys and a display unit is provided on the upper front of the main body 1 of the washing machine.
A control circuit 14 for controlling the operation of the drum-type washing machine is disposed on the back side of 3. The water supply pipes 15a and 15b arranged at the upper part of the main body 1 of the washing machine are connected to water pipes, and have first and second water supply valves 16a and 16b in the middle respectively.

When the first and second water supply valves 16a and 16b are opened, the tap water from the water pipe is supplied to the detergent case 17. The interior of the detergent case 17 is divided into two chambers, a detergent storage chamber for storing a detergent and a softener storage chamber for storing a softener. First and second water supply valves 16a, 16b
Tap water containing a detergent or a softening agent is provided on the upper part of the washing machine main body 1 in accordance with the opening of any one of the above.
From 8, water is supplied into the water tank 2. Also,
Water can be supplied into the water tank 2 without containing any detergent or softener.

The drain duct 1 led out from the lower part of the water tank 4
Reference numeral 9 is connected to a connection case 20 in which a lint filter 21 is provided, and the drainage device 22 drains the washing liquid from the water tub 4 to the outside of the washing machine main body 1. Lint filter 2
1 is, for example, formed by forming fine fibers into a bag shape, and is detachably mounted in the connection case 20;
The washing machine body 1 can be detached from the front.

An air trap 24 and a water level sensor 25 are provided at the upper part of the connection case 20 and connected by a pressure guiding pipe 23. The water level sensor 25 moves the magnetic substance in the coil according to the pressure change in the air trap 24, and detects the resulting change in the inductance of the coil as a change in the oscillation frequency to detect the water level in the water tank 4.

FIG. 3 shows the drum type washing machine shown in FIG.
FIG. 3 is a side cross-sectional view of a section cut at a position different from that of FIG. As in the case of the conventional drum type washing machine, an air duct 8 is provided between the upper front edge of the water tub 4 and the lower back wall. A cooler 9, a blower 10, and a heater 11 are provided inside the blower duct 8. When the blower 10 is driven, hot air is blown into the rotary drum 5 as indicated by arrows f1 and f2. The air in the rotary drum 5 flows through the small holes 5a into the air duct 8 as shown by arrows f3 and f4, and circulates.

In the above configuration, first, the laundry is put in from the laundry inlet 2, the opening / closing door 3 is closed, the detergent is put in the detergent case 17, and the operation panel 13 is operated.
Thereby, the door 3 is locked and the first water supply valve 16a is opened. Based on the opening of the first water supply valve 16a, the tap water passes through the detergent storage chamber of the detergent case 17 on the way, and is supplied to the water tank 4 and the rotary drum 5 from the water supply nozzle 18 containing the detergent.

When the water level in the water tank 4 reaches a predetermined water level, the water level sensor 25 operates to detect that the water level has reached a predetermined value. As a result, the first water supply valve 16a is closed, and the rotating drum 5 is rotated by the drive motor 7 according to the rotation chart for the washing step, thereby executing the washing step.

The rotation of the rotary drum 5 is set in advance by a plurality of rotation charts having different rotation speeds and reversal cycles depending on the washing step, rinsing step, dehydrating step, drying step, or the type of laundry. And is programmed to be selected by the user or automatically selected.

When the washing process is completed, the washing liquid is drained out of the main body 1 of the washing machine through the drainage duct 19 and the lint filter 21 by the drainage device 22. When the drainage is completed, the rotary drum 5 rotates at a high speed in the rotation chart for the dehydration process,
A rinse dewatering step is performed. The washing liquid contained in the laundry is discharged to the inner wall of the water tub 4 through the small holes 5a formed in the peripheral wall of the rotating drum 5 by centrifugal force. The washing liquid flows down along the inner wall of the water tub 4 and is drained to the outside through the drain duct 19.

At the same time, the first water supply valve 16a is opened,
Tap water is injected from the water supply nozzle 18 into the water tank 4. At this time, the detergent in the detergent case 17 is not included. The tap water permeates the laundry by centrifugal force, and the detergent contained in the laundry is more effectively removed.

When the rinsing dehydration step is completed, the program switches to the rinsing step. When the drainage device 22 is stopped and the second water supply valve 16b is opened, the tap water passes through the softener storage chamber of the detergent case 17 on the way and contains the softener and rotates from the water supply nozzle 18 to the water tank 4. Drum 5
Supplied within. When the water level in the water tank 4 reaches a predetermined water level, the water level sensor 25 is operated to detect that the water level has reached a predetermined value, and the rotary drum 5 is rotated according to the rotation chart for the rinsing step to execute the rinsing step. I do.

When the rinsing step is completed, the first water supply valve 1
6a is closed and the drainage device 22 is driven to drain the washing liquid to the outside. When the drainage is completed, the rotary drum 5 is rotated at a high speed on the rotation chart for the dewatering process, and the finishing dewatering process is performed, similarly to the rinse dewatering process. The washing liquid contained in the laundry is discharged to the inner wall of the water tub 4 through the small holes 5a formed in the peripheral wall of the rotating drum 5 by centrifugal force. The washing liquid flows down along the inner wall of the water tub 4 and is drained to the outside through the drain duct 19.

When the finish dewatering step is completed, a drying step is started. In this drying step, when the blower 10 is driven, the air in the water tank 4 and the rotating drum 5 circulates as indicated by arrows f1 to f4. The air in the air duct 8 cooled by the cooler 9 is dehumidified by the condensation of moisture and becomes dry air to reach the heater 11. Then, the air is heated by the heater 11 to become hot air and blown into the water tank 4. The hot air that has come in contact with the laundry again and absorbed the moisture is again supplied to the air duct 8.
The air is sucked into the inside, and is cooled and dehumidified by the cooler 9 as in the previous case. By repeating this operation, the drying step is performed.

Then, the humidity or temperature in the rotary drum 5 is detected by a humidity sensor or a temperature sensor (not shown), and when a predetermined value is detected, the drying process ends. The moisture dehumidified and condensed in the drying step is supplied to the air duct 8
Flows down into the water tank 4 from the exhaust port 4a, and is drained to the outside via the drain duct 19.

During this drying step, the rotating drum 5 rotates according to the rotation chart for the drying step. This rotation chart is
From the start to the end of the drying, there are a plurality of rotation speeds or a plurality of reversal periods and pauses. As a result, the laundry in the rotating drum 5 does not rotate in the same form,
It is dispersed and agitated, so that the hot air contacts the whole of the laundry on average.

FIGS. 4A to 4G show examples of rotation patterns constituting a rotation chart for the drying step. In the rotation pattern A shown in FIG. 4A, the clock Ta is rotated right at the same rotation speed R0 as in the washing process, the time Sa is paused, and the clock Ta is rotated left at the same rotation speed L0 as the washing process and the time Sa is paused. It has become. Here, the absolute values of the rotation speed R0 and the rotation speed L0 are the same.

In the rotation pattern B shown in FIG. 4B, the rotation speed is R0, time Tb clockwise rotation, time Sb pause, rotation speed L0 time Tb left rotation, time Sb pause. Here, the times Tb and Sb are different from the times Ta and Sa.

The rotation pattern C shown in FIG. 4C has a rotation speed Tc clockwise at a rotation speed Ra lower than the rotation speed R0, a time Sc pause, a rotation Tc left rotation at a rotation speed La lower than the rotation speed L0, a time Sc pause. , To do. Here, the absolute values of the rotation speed Ra and the rotation speed La are the same. Further, the times Tc and Sc may be the same as or different from the times Ta and Sa.

In the rotation pattern D shown in FIG. 4D, rotation is performed at the rotation speed Ra for the right time Td, pause for the time Sd, rotation speed La for left rotation for the time Td, and pause for the time Sd. Here, the times Td and Sd are different from the times Tc and Sc.

The rotation pattern E shown in FIG. 4 (e) includes a right rotation Te for a rotation speed Re lower than the rotation speed Ra, a pause Se for a time, a left rotation Te for a rotation speed Le lower than the rotation speed La, and a left rotation. Se pause is performed. Here, the absolute values of the rotation speed Re and the rotation speed Le are the same. The time Te and Se are the time Ta and S
The time may be the same as a or a different time.

The rotation pattern F shown in FIG.
With respect to the rotation pattern C shown in (c), the clockwise rotation at the rotation speed Ra with a pause for a predetermined time is performed twice in the middle. Further, the rotation pattern G shown in FIG.
With respect to the rotation pattern D shown in (d), the rotation speed is changed for a time Tg. Each of the above rotation patterns
The right rotation (forward rotation) and the left rotation (reverse rotation) may have different rotation speeds or different rotation times.

Then, a rotation chart for a drying step is formed by combining the above rotation patterns. FIG. 5 shows an example of a rotation chart for the drying process. In the rotation chart 101 of the cotton course, after the rotation pattern A is executed for a predetermined time, the main rotation pattern C is executed for a predetermined time, and further, the rotation pattern D, E is executed for a predetermined time.

The rotation chart 102 of the blanket course includes a strong rotation pattern B having a large absolute rotation speed R0, L0 and a long rotation time Tb, and sequentially executes each rotation pattern A, B, A, F. I do. In the rotation chart 103 of the delicate synthetic fiber course, the rotation pattern G is executed after a soft rotation pattern E having a low rotation speed is executed for a predetermined time.

The operation panel 13 is provided with switches for selecting a drying course such as a cotton course, a blanket course, and a synthetic fiber course corresponding to the type of the laundry. 102 and 103 are selected. The rotation chart is not limited to the above example, and other changes can be made to the rotation speed and the rotation time.

On the other hand, in the drying step, since the dehydrated laundry is rotated and stirred, the load is smaller than in the washing step in which the laundry is rotated together with the washing liquid. In the rotation charts 101, 102, and 103 shown in FIG.
It is rotated at a rotation speed lower than the absolute value of 0, L0, and the effect of stirring the laundry is improved.

At this time, if the rotation speed of the rotating drum 5 is made smaller than the rotation speed at which the laundry sticks to the inner wall of the rotation drum 5 (hereinafter referred to as "critical rotation speed") by the centrifugal force in the water supply state, the laundry is reliably stirred. And can be dispersed. It is desirable that the rotation speed of the rotating drum 5 be 80% or less of the critical rotation speed because the stirring can be performed more reliably. The acceleration g applied to the laundry in this case can be obtained by the following equation.

G = D / {2 × (2πN / 60) ² } where g: gravity acceleration (cm / sec ² ) N: number of rotations of rotating drum (rpm) D: diameter of rotating drum (cm)

In the rotation chart shown in FIG. 5, the rotating drum 5 is rotated at a high rotation speed or a long rotation time immediately after the start of the drying step containing a large amount of water. The rotation speed of the rotary drum 5 is reduced as the moisture of the laundry decreases as the drying process proceeds.

As a result, the laundry in the drying step can always be sufficiently agitated and drying can be performed more efficiently.
It is more preferable to rotate the rotary drum 5 at a rotation speed of 80% or less of the critical rotation speed for 50% or more of the total rotation time of the rotating drum 5 during the drying process, since moisture can be removed and the lightened laundry can be surely stirred. .

As shown in FIG. 6, in the rotary drum 5 of the present embodiment, the area of the small holes 5a per unit area of the peripheral wall of the rotary drum 5 (hereinafter referred to as "opening ratio") is made irregular in the axial direction. . In this case, the hot air easily flows out of the portion having a large aperture ratio, and is dispersed and flows out in the rotary drum 5 to the portion having a large aperture ratio. Therefore, the hot air can come into contact with the laundry without unevenness to improve the drying efficiency. The same effect can be obtained even if the aperture ratio is irregular in the circumferential direction of the rotating drum 5.

In particular, the opening ratio within a predetermined distance L1 in the axial direction from the opening 5b is set to 50% of the opening ratio between the distances L2 of the other portions.
% Or less. Therefore, the hot air that has flowed in from the opening 5b does not immediately flow out from the vicinity of the opening 5b, but can reach the inner part of the rotary drum 5 sufficiently. The small holes 5a within the predetermined distance L1 are preferably set to the minimum necessary for dehydration and drainage, and are preferably made non-porous if possible.

The aperture ratio of the small holes 5a may be gradually changed in the axial direction of the rotary drum 5, as shown in FIG. As shown in FIG. 8, a small hole 5a is formed in the bottom wall 5d of the rotary drum 5.
May be provided. This makes it easier for the hot air flowing from the opening 5b of the rotary drum 5 to travel toward the back. Therefore, it is possible to efficiently bring hot air into contact with the laundry that easily accumulates in the back of the rotating drum 5 in which the rotation axis YY (see FIG. 2) is inclined, and it is possible to improve the drying efficiency.

As shown in FIG. 9, an opening pattern 5e having a plurality of small holes 5a having different opening ratios in the axial direction of the rotating drum 5 may be repeatedly formed in the circumferential direction of the rotating drum 5. By doing so, the plate forming the outer peripheral wall of the rotary drum 5 can be sequentially fed and punched by a mold having a shape corresponding to the opening pattern 5e to form the small holes 5a. Therefore, small holes having different aperture ratios can be easily formed at low cost using a small mold.

[0060]

According to the present invention, since the rotation of the rotating drum during the drying step is not uniform, the laundry is easily agitated and the shape becomes irregular, and the hot air uniformly contacts the entire laundry to dry. Efficiency can be improved.

Further, according to the present invention, the rotating drum is rotated by selecting from a plurality of rotating charts in the drying step, so that optimum drying can be performed according to the type of laundry, and power consumption can be reduced and clothes and the like can be saved. Damage can be prevented.

Further, according to the present invention, the rotating speed of the rotating drum during the drying step is made lower than that during the washing step, so that the laundry with reduced moisture content due to dehydration does not stick to the inner wall of the rotating drum due to centrifugal force. Are easily dispersed and stirred in the rotating drum. Therefore, hot air is wide throughout the laundry,
It can be evenly contacted and dried efficiently.

According to the present invention, the rotating speed of the rotating drum during the drying process is set lower than that during the washing process, and the time during which the rotating drum is rotated at a rotating speed of 80% or less of the set critical rotation speed during the drying process. Is set to 50% or more of the total time the rotating drum rotates, so that the laundry with less moisture due to dehydration can be easily dispersed, and the laundry with less moisture due to drying can be further rotated at the rotating speed of the rotating drum. And disperse. Therefore, even if the moisture of the laundry changes, the laundry does not stick to the inner wall of the rotating drum, and the drying efficiency can be improved.

According to the present invention, small holes are formed with different opening ratios in the axial direction or circumferential direction of the rotary drum.
Hot air that easily flows out of the portion having a large aperture ratio is dispersed and flows out in the rotating drum. Therefore, the hot air is wide, and can contact the laundry evenly to improve the drying efficiency.

According to the present invention, the dry hot air flowing into the rotary drum from the front of the rotary drum is prevented from flowing out of the rotary drum from the small hole with a small amount in front of the rotary drum having a small opening ratio, and the rotary hot drum is suppressed. During this time, the hot air is widely spread over the entire laundry, and can be uniformly dried and efficiently dried.

Further, according to the present invention, small holes can be formed by sequentially feeding and punching a plate forming the outer peripheral wall of the rotary drum using a mold having a shape corresponding to the opening pattern. Therefore, small holes having different aperture ratios can be easily formed at low cost using a small mold.

Further, according to the present invention, the dry hot air flowing into the rotary drum from the front of the rotary drum flows over the bottom wall of the rotary drum. And can be dried efficiently without contact.

[Brief description of the drawings]

FIG. 1 is an external perspective view showing a drum type washing machine according to an embodiment of the present invention.

FIG. 2 is a side sectional view showing the drum type washing machine according to the embodiment of the present invention.

FIG. 3 is a side sectional view of the drum type washing machine according to the embodiment of the present invention, which is cut at another position and viewed.

FIG. 4 is an example of a rotation pattern forming a rotation chart of the drum type washing machine according to the embodiment of the present invention.

FIG. 5 is an example of a rotation chart of the drum type washing machine according to the embodiment of the present invention.

FIG. 6 is a side view showing a rotating drum of the drum type washing machine according to the embodiment of the present invention.

FIG. 7 is a side view showing another rotating drum of the drum type washing machine according to the embodiment of the present invention.

FIG. 8 is a side view showing still another rotating drum of the drum type washing machine according to the embodiment of the present invention.

FIG. 9 is a side view showing still another rotating drum of the drum type washing machine according to the embodiment of the present invention.

FIG. 10 is a side sectional view showing a conventional drum type washing machine.

FIG. 11 is a front view showing a rotating drum of a conventional drum-type washing machine.

FIG. 12 is a side sectional view showing a rotating drum of a conventional drum type washing machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Washing machine main body 2 Opening 3 Opening / closing door 4 Water tank 5 Rotating drum 5a Small hole 5b Opening 6 Rotating shaft 7 Drive motor 8 Ventilation duct 9 Cooler 10 Blower 11 Heater 13 Operation panel 14 Control circuit 15a, 15b Water supply pipe 16a , 16b Water supply valve 18 Water supply nozzle 22 Drainage device

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3B155 AA16 BA08 BB04 BB15 CA02 CB07 DC18 DC23 DD05 JC07 LB04 LB16 LB17 LB18 MA01 MA02 MA07 4L019 AC02 AG04 EA02 EC07

Claims (11)

[Claims] 1. A water tub having a front surface opened in a washing machine main body, a rotary drum having a plurality of small holes in a peripheral wall surface and rotatably supported in the water tub, and rotation of the rotary drum. In a drum-type washing machine having a control circuit for controlling the rotation of the rotary drum and blowing means for sending hot air from the opening of the rotary drum into the rotary drum, the rotary chart having at least one of an absolute value of a rotation speed and a reversal cycle. A drum type washing machine characterized in that the rotary drum during the drying step is controlled by a washing machine. 2. The drum type washing machine according to claim 1, wherein the water tank and the rotary drum have an opening side inclined at a predetermined angle above the bottom wall side. 3. The drum type washing machine according to claim 1, wherein a plurality of the rotation charts having different rotation speeds or reversal periods can be selected. 4. The method according to claim 1, wherein the rotating speed of the rotating drum during the drying step is lower than that during the washing step.
The drum-type washing machine according to claim 3. 5. The drum type washing machine according to claim 4, wherein the rotation speed of the rotary drum during the drying step is set to 80% or less of the critical rotation speed. 6. The rotating drum according to claim 4, wherein the rotating speed of the rotating drum during the drying step is set to be 50% or more of the total rotating time during the drying step and 80% or less of the critical rotation number. Drum type washing machine. 7. The rotating drum according to claim 1, wherein an opening area of the small hole per unit area of a peripheral wall surface of the rotating drum is changed in an axial direction or a circumferential direction of the rotating drum. A drum-type washing machine as described in Crab. 8. An opening area of said small hole per unit area of a peripheral wall surface of said rotary drum is made larger near a bottom wall than near an opening of said rotary drum.
The drum-type washing machine according to item 1. 9. An opening area of the small hole per unit area of a peripheral wall surface of the rotary drum in a range of not more than a predetermined dimension in an axial direction from an opening end of the rotary drum, the opening area being in a range of not less than the predetermined dimension. The drum type washing machine according to claim 7, wherein 50% or less of the drum type washing machine is used. 10. The drum type washing machine according to claim 7, wherein the same opening pattern including a plurality of small holes is formed at predetermined intervals in a circumferential direction of the rotating drum. Machine. 11. The drum type washing machine according to claim 1, wherein a small hole is provided in a bottom wall of the rotary drum.