JP2012143478A - Washing and drying machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a washing and drying machine improved in life time and reduction of production cost.SOLUTION: A washing and drying machine 1, which performs a washing step of washing laundry placed in a washing/dewatering tub 30 and a drying step of drying the laundry by sending warm air into the washing/dewatering tub 30 with ions supplied to the washing/dewatering tub 30 during or after the drying step, comprises a synthetic material detecting part for detecting an amount of synthetic materials included in the laundry, and a smaller quantity of ions are generated when the amount of synthetic materials is smaller than when the amount is large.

Description

  The present invention relates to a laundry dryer for washing and drying laundry.

  If the clothes are charged with static electricity after the drying operation of the washing / drying machine, the user may feel uncomfortable when taking out the clothes. This phenomenon is particularly likely to occur when the fiber is dried.

  Conventional washing and drying machines are disclosed in Patent Document 1 and Patent Document 2. The washing and drying machine disclosed in Patent Document 1 can remove static electricity from clothes by supplying negative ions into the washing tub. The washer / dryer of Patent Document 2 includes a static electricity detecting means including a humidifier and an antenna. When the static electricity detection means detects the static electricity of the clothes, the humidifier can apply moisture to the clothes and remove the static electricity on the clothes.

JP 2003-326089 A JP-A-4-348799 JP-A-6-233898

  However, according to the conventional washer / dryer, the washer / dryer disclosed in Patent Document 1 has a problem that the negative ion generation rate decreases due to the long-term use of the negative ion generating means. In addition, since the washing and drying machine of Patent Document 2 is newly provided with static electricity detection means, there is a problem that the structure becomes complicated and the manufacturing cost of the washing and drying machine increases.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a washing / drying machine that extends the life of the apparatus.

  In order to achieve the above object, the washing and drying machine of the present invention has a washing process in which laundry is put into a washing and dehydrating tub and washing is performed, and warm air is sent to the washing and dehydrating tub to dry the laundry. A washing step of supplying ions to the washing and dewatering tub during or after the drying step, and comprising a chemical detection unit for detecting the amount of chemical contained in the laundry, and the amount of chemical The amount of ion generation is reduced as compared with the case where the amount is less than the predetermined amount. According to this configuration, the amount of static electricity generated by detecting the amount of the fiber is determined by the fiber detection unit.

  Moreover, the washing / drying machine of the present invention is characterized in that, in the above configuration, the supply of ions is stopped when the amount of the synthetic fiber is less than a predetermined amount.

  In the above-described configuration, the washing and drying machine of the present invention includes a cloth amount detection unit that detects the amount of laundry and a water level sensor that detects a water level of the washing and dehydrating tub, and the chemical fiber detection unit includes The amount of chemical fiber contained in the laundry is detected based on the difference between the water level of the washing / dehydrating tub when the water is supplied according to the quantity of the item and the water level of the washing / dehydrating tub when a predetermined time has elapsed after the water supply. It is characterized by that.

  According to this configuration, the amount of laundry is detected by the cloth amount detection unit to detect the amount of laundry. Next, a water amount corresponding to the amount of laundry is supplied into the washing and dewatering tub, and a water level difference between before and after the water supply is detected by a water level sensor. The amount of synthetic fiber contained in the laundry is detected from the amount of laundry and the water level difference before and after water supply.

  Further, the washing and drying machine of the present invention, in the above configuration, includes a cloth amount detection unit that detects the amount of laundry, and a temperature sensor that detects a temperature in the washing and dehydrating tub, and the chemical fiber detection unit includes: The amount of synthetic fiber contained in the laundry is detected based on a temperature change in the washing / dehydrating tub when a predetermined time has elapsed since the start of the drying step.

  According to this configuration, the amount of laundry is detected by the cloth amount detection unit to detect the amount of laundry. Next, in the drying process, a temperature change in the washing / dehydrating tub is detected by a temperature sensor. The amount of synthetic fiber contained in the laundry is detected from the amount of laundry and the temperature change in the washing and dewatering tank.

  Moreover, the washing / drying machine of the present invention is characterized in that, in the above configuration, the ion concentration is increased when overdrying in the washing / dehydrating tub is detected. With this configuration, static electricity generated by overdrying can be removed.

  The washing and drying machine of the present invention may further include a pulsator that stirs the laundry in the washing / dehydrating tub, and the drying step rotates the washing / dehydrating tub during the dehydration rotation period. And a stirring period in which the dehydration tank is stopped and the pulsator is rotated, and the amount of ions supplied during the stirring period is larger than that in the dehydration rotation period. With this configuration, more ions can be applied to the laundry loosened by the rotation of the pulsator.

  According to the present invention, by changing the amount of ion generation according to the state of generation of static electricity, the amount of ion generation can be minimized and the life of the apparatus can be extended. Further, it is possible to determine whether or not static electricity needs to be removed at low cost by using existing detection means as a washing and drying machine without providing static electricity detection means. Therefore, it is not necessary to provide static electricity detection means as in the conventional example, and the manufacturing cost of the washing / drying machine can be reduced.

It is a perspective view which shows the washing-drying machine which concerns on embodiment of this invention. It is side surface sectional drawing which shows schematic structure of the washing-drying machine which concerns on embodiment of this invention. It is a perspective view which shows the state which opened the cover part of the washing-drying machine which concerns on embodiment of this invention. It is a block diagram which shows the structure of the washing-drying machine which concerns on embodiment of this invention. It is a flowchart which shows the operation control of each process of the washing / drying machine which concerns on 1st Embodiment of this invention. It is a flowchart which shows the modification of the operation | movement control of each process of the washing / drying machine which concerns on 1st Embodiment of this invention. It is a flowchart which shows operation | movement control of each process of the washing-drying machine which concerns on 2nd Embodiment of this invention. It is a flowchart which shows the modification of the operation | movement control of each process of the washing / drying machine which concerns on 2nd Embodiment of this invention.

[First embodiment]
Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof. FIG. 1 is a perspective view showing a washer / dryer according to an embodiment of the present invention from a diagonally upper front point of view, and FIG. 2 is a schematic side sectional view showing the washer / dryer of FIG. In the washing and drying machine shown in FIG. 2, the left side is the front surface and the right side is the back surface.

  The washing / drying machine 1 is a fully automatic type and includes a rectangular parallelepiped outer box 10. The outer box 10 is formed in a substantially rectangular parallelepiped shape, and its upper and lower sides are opened. The upper open portion of the outer box 10 is covered with an upper surface plate 11. An operation unit 71 for operating the washing / drying machine is provided on the front side of the top plate 11, and the back panel 14 is mounted on the back side of the top plate 11.

  An entrance / exit 11a for feeding laundry into the washing / drying machine 1 is opened at the center of the top plate 11. The entrance / exit 11a is opened and closed by a lid 15 pivotally supported by a hinge 15a provided at the front end of the back panel 14. A packing (not shown) is provided on the periphery of the lid portion 15, and the space between the entrance / exit 11 a and the lid portion 15 is sealed. By rotating the lid portion 15 up and down to open and close the entrance / exit 11a, the laundry can be put into or taken out of the dehydration tank 30 described later.

  FIG. 3 is a perspective view showing a state in which the lid portion 15 is opened. In FIG. 1 to FIG. 3, a dewatering tank 30 that also serves as a washing tub and a water tank 20 that houses the dewatering tub 30 are housed inside the outer box 10. The dewatering tank 30 stores water in which detergent is dissolved or water for rinsing (hereinafter collectively referred to as “washing water”). Both the water tank 20 and the dewatering tank 30 are formed in a bottomed cylindrical shape having an open upper surface, and are arranged concentrically with the water tank 20 on the outside and the dewatering tank 30 on the inside, with the axes thereof being vertical.

  The water tank 20 is suspended by a suspension member 21. Suspension members 21 are provided at a total of four locations connecting the lower outer surface of the water tank 20 and the inner corners of the outer box 10, and support the water tank 20 so that it can swing within a horizontal plane.

  The dewatering tank 30 has a peripheral wall extending upward in a tapered shape, and this peripheral wall has no opening for allowing liquid to pass except for a plurality of dewatering holes 31 arranged in an annular shape at the uppermost portion. That is, the dewatering tank 30 is formed in a so-called “no hole” type. An annular balancer 32 is attached to the edge of the upper opening of the dewatering tub 30 to suppress vibration when the dewatering tub 30 is rotated at a high speed for dewatering the laundry. A pulsator 33 for causing the washing water to flow in the tank is disposed on the inner bottom surface of the dewatering tank 30.

  A drive unit 40 is attached to the lower surface of the water tank 20. The drive unit 40 includes a motor 41 and a clutch / brake mechanism 43. The clutch / brake mechanism 43 is connected to the motor 41 by a belt 42, and the dewatering shaft 44 and the pulsator shaft 45 protrude upward. The clutch / brake mechanism 43 operates by electromagnetic force, and alternatively connects one of the dewatering shaft 44 and the pulsator shaft 45 to the motor 41. The clutch / brake mechanism 43 brakes the rotation of the dehydrating shaft 44 by electromagnetic force and releases the brake.

  The dewatering shaft 44 and the pulsator shaft 45 have a double shaft structure. The dewatering shaft 44 is disposed outside and the pulsator shaft 45 is disposed inside. The dewatering shaft 44 penetrates the water tank 20 and is connected to the dewatering tank 30 to support the dewatering tank 30. The pulsator shaft 45 passes through the water tank 20 and the dewatering tank 30 and is connected to the pulsator 33 to support the pulsator 33. Seal members for preventing water leakage are disposed between the dewatering shaft 44 and the water tank 20 and between the dewatering shaft 44 and the pulsator shaft 45, respectively.

  The outer box 10 is provided with an extending portion 16 that extends downward from the periphery of the doorway 11a. The extending portion 16 has a substantially vertical vertical portion 16a formed in an annular shape and a horizontal portion 16b extending substantially horizontally from the lower end of the vertical portion 16a. An annular bellows-like elastic body 17 is attached to the lower surface of the horizontal portion 16b. The extending portion 16 and the upper surface of the water tank 20 are connected by the elastic body 17, and the vibration of the water tank 20 due to the rotation of the dewatering tank 30 or the like is absorbed.

  Further, the extended portion 16 and the elastic body 17 shield between the periphery of the entrance / exit 11 a and the upper surface of the water tank 20. Thereby, a sealed space is formed between the water tank 20 and the entrance / exit 11a. Accordingly, an inner lid that opens and closes the upper surface of the water tank 20 is not required, and the lid 15 can be closed to perform washing and drying.

  A drying unit 91 is installed on the extended portion 16 at the rear of the outer box 10. The drying unit 91 includes the blower 50 and the heater 54, and terminals such as a water level sensor 74 (see FIG. 4) are installed on the horizontal portion 16b.

  As for the drying unit 91, the suction inlet 51a opens two places in the vertical part 16a and the horizontal part 16b of the extending part 16, and the blower outlet 51d opens in the horizontal part 16b. At this time, the air outlet 51d is arranged so as to blow out warm air along the inner peripheral wall of the dewatering tank 30 downward.

  The suction inlet 51a and the outlet 51d are connected by a circulation duct 51, and a PCI generator 80, a blower 50, and a heater that generate plasma cluster ions (hereinafter referred to as "PCI") composed of positive ions and negative ions in the circulation duct 51. 54 is arranged. PCI has an effect of removing static electricity charged in the laundry.

  The heater 54 is composed of a PTC (Positive Temperature Coefficient) heater, and warm air is sent out from the outlet 51 d by driving the blower 50 and the heater 54. At this time, PCI generated by the PCI generator 80 is also discharged into the circulation duct 51 and sent out from the outlet 51d together with warm air. If the hot air becomes too hot, the synthetic resin parts inside the washer / dryer 1 may be melted. For this reason, it is good to set so that the blowing temperature from the circulation duct 51 may not exceed 90 ° C.

  Further, the horizontal portion 16b of the extending portion 16 is provided with a water supply port (not shown). The water supply port is connected to city water through a water supply valve 77 (see FIG. 5).

  A drain hose 60 for draining the water in the water tank 20 and the dehydration tank 30 to the outside of the outer box 10 is attached to the bottom of the water tank 20. The dewatering tank 30 is provided with four drain holes 62 on the same circumference, and each drain hole 62 and the drain hose 60 are connected by a drain duct 61. A drain valve 63 is provided in the drain duct 61. When the drain valve 63 is opened, the water in the dehydration tank 30 is drained through the drain duct 61 and the drain hose 60. Further, the water that flows out from the upper part of the dehydration tank 30 during dehydration passes through between the peripheral wall of the water tank 20 and the peripheral wall of the dehydration tank 30 and is drained from the drain hose 60.

  FIG. 4 is a block diagram showing the configuration of the washing / drying machine 1. The control unit 70 includes a motor 41, a clutch / brake mechanism 43, a blower 50, a heater 54, a water supply valve 77, a PCI generator 80, an operation unit 71, a display unit 72, a lid open / close sensor 73, a water level sensor 74, a temperature sensor 75, A humidity sensor 76 and a cloth amount detection unit 78 are connected.

  The display unit 72 is provided in the operation unit 71 and displays an operation screen and an operation state of the washing / drying machine 1. The lid opening / closing sensor 73 detects the opening / closing state of the lid portion 15. The water level sensor 74 detects the water level in the dehydration tank 30. The temperature sensor 75 detects the temperature inside the dehydration tank 30. The humidity sensor 76 detects the humidity inside the dehydration tank 30. The cloth amount detection unit 78 detects the amount of laundry put into the dehydration tank 30. Specifically, the pulsator 33 is rotated at the start of washing, and the load of the motor 41 at this time is detected to detect the amount of laundry.

  FIG. 5 is a flowchart showing operation control of each process of the washing / drying machine 1 according to the first embodiment. In the washing / drying machine 1 having the above-described configuration, the laundry is put into the dewatering tank 30 from the entrance / exit 11a, and the lid portion 15 is closed. When the washing part is selected by the operation unit 71 and the start of washing is instructed, the lid opening / closing sensor 73 detects that the lid unit 15 is closed, and the washing operation and the drying operation are executed.

  In the washing process, after the laundry is put in, the amount of laundry in the dewatering tub 30 is detected by the cloth amount detection unit 78 in step # 11. In step # 12, the drain valve 63 is closed and the water supply valve 77 is opened to supply water to the dehydration tank 30 from the water supply port. In step # 13, it is determined whether or not a target water level corresponding to the amount of laundry has been reached. When the target water level is reached by detection of the water level sensor 74, the water supply valve 77 is closed.

  In step # 15, the pulsator 33 is rotated at a low speed for a predetermined time to stir the laundry so that the entire laundry is allowed to conform to water. In step # 16, the water level is detected again by the water level sensor 74 and stored in a memory (not shown).

  The washing process includes a washing operation, a dehydrating operation, and a rinsing operation. In step # 17, the clutch / brake mechanism 43 connects the pulsator shaft 45 to the motor 41 to drive the motor 41. Thereby, the pulsator 33 rotates and the washing operation is started by stirring the water in the dewatering tank 30. After completion of the washing operation, the drain valve 63 is opened to drain the water in the dehydration tank 30.

  Next, the dehydrating shaft 44 is connected to the motor 41 by the clutch / brake mechanism 43. Thereby, the dehydrating tank 30 is rotated at a high speed by the drive of the motor 41 and the dehydrating operation is performed. Water splashed from the laundry due to the high-speed rotation of the dewatering tank 30 flows out from the drainage duct 61 and the dewatering hole 31. After completion of the dehydration operation, the drain valve 63 is closed and the water supply valve 77 is opened. When a predetermined amount of water is accumulated in the dehydration tank 30, the water supply valve 77 is closed by detection of the water level sensor 74.

  Next, the pulsator shaft 45 is connected to the motor 41 by the clutch / brake mechanism 43 to drive the motor 41. As a result, the pulsator 33 rotates, and the rinsing operation is performed by stirring the water in the dewatering tank 30. After the rinsing operation is completed, the dehydrating operation is performed again. When these washing steps are completed, the process proceeds to step # 21.

  When the washing process is completed, a drying process is performed. In step # 21, the blower 50 and the heater 54 are driven. The air in the water tank 20 is circulated through the circulation duct 51 by driving the blower 50. The air flowing into the circulation duct 51 is heated by the heater 54 and sent out into the water tank 20 from the outlet 51d. Thereby, the air in the water tank 20 is heated.

  In step # 30, it is determined by the humidity sensor 76 whether or not the detected humidity in the dehydrating tank 30 is lower than a predetermined value and the drying process is terminated. If it is determined that the drying process is completed, the process proceeds to step # 31 and the heater 54 is stopped.

  In step # 32, the amount of synthetic fiber contained in the laundry is calculated from the amount of laundry detected in step # 11 and the water level difference before and after stirring of the laundry in step # 15. That is, when the water level difference is large, it is determined that the amount of chemical fiber is small, and when the water level difference is small, it is determined that the amount of chemical fiber is large. Therefore, the cloth amount detection unit 78 and the water level sensor 74 constitute a fiber detection unit that detects the amount of fiber included in the laundry.

  When it is determined in step # 33 that the amount of synthetic fiber contained in the laundry is greater than the predetermined amount, the PCI generator 80 is driven in step # 34. Thereby, PCI is discharged | emitted in the circulation duct 51, and the air containing PCI in the dehydration tank 30 is sent out from the blower outlet 51d. At this time, the static electricity on the laundry is removed by PCI. In particular, since the static electricity is likely to be generated when the amount of the synthetic fiber contained in the laundry is large, the generation amount of the PCI released by the PCI generator 80 is controlled according to the amount of the synthetic fiber. When it is determined in step # 33 that the synthetic fiber is less than the predetermined amount, the PCI generator 80 is not driven and the process proceeds to step # 36. It is to be noted that static electricity can be efficiently removed by discharging PCI while rotating the pulsator 33 to loosen the laundry.

  In step # 35, the PCI generator 80 is driven and waits until a predetermined time elapses. When a predetermined time has elapsed after starting to drive the PCI generator 80, the process proceeds to step # 36, and the driving of the PCI generator 80 and the blower 50 is stopped. Then, the fact that all these operations have been completed is notified by display on the display unit 72, voice, or the like.

  According to the present embodiment, it is determined that there is a large amount of static electricity generated when the amount of synthetic fiber contained in the laundry is larger than a predetermined amount, and the PCI generator 80 is driven, and when it is small, the PCI generator 80 is stopped. The drive of the PCI generator 80 can be minimized. Further, the PCI generator 80 is intermittently driven or the voltage applied to the PCI generator 80 is suppressed in order to suppress the amount of PCI generated by the PCI generator 80 when the amount of synthetic fiber is small. Thereby, the lifetime of the PCI generator 80 can be extended.

  In addition, the existing cloth amount detection unit 78 and the water level sensor 74 can easily realize a fiber detection unit that detects the amount of fiber in the laundry, so that the amount of fiber in the laundry can be reduced without providing static electricity detection means. It is possible to detect and detect the amount of static electricity generated. Therefore, the manufacturing cost of the washing / drying machine can be reduced.

  Further, in the drying step, there is a dehydration rotation period in which the dehydration tank 30 is rotated to dry the laundry, and an agitation period in which the dehydration tank 30 is stopped and the pulsator 33 is rotated to loosen the laundry. At this time, it is possible to apply more PCI to the laundry loosened by the rotation of the pulsator 33 by making the supply amount of PCI during the stirring period larger than the dehydration rotation period. As a result, the static electricity on the laundry can be efficiently removed.

  In addition, FIG. 6 is a flowchart which shows the modification of the operation control of each process of the washing / drying machine 1 which concerns on 1st Embodiment. By arranging Step # 32 to Step # 35 after Step # 22, the PCI generator 80 can be driven during the drying process to remove the static electricity of the laundry.

[Second Embodiment]
FIG. 7 is a flowchart showing operation control of each process of the washing / drying machine 1 according to the second embodiment. In addition, it is the same as the structure of the washing / drying machine of 1st Embodiment shown in FIGS. 1-4, and the same process as 1st Embodiment attaches | subjects the same code | symbol and abbreviate | omits description.

  The control operation of the present embodiment is realized by the cloth amount detection unit 78 and the temperature sensor 75 as a fiber detection unit that detects the amount of fiber in the laundry.

  When the washing process ends, the process proceeds to step # 21, and air that has been heated by driving the blower 50 and the heater 54 is sent into the water tank 20 from the outlet 51d.

  After the drying operation is started in step # 22, the temperature in the dehydration tank 30 is detected by the temperature sensor 75 in step # 23. In step # 24, the process waits until a predetermined time elapses. When the predetermined time elapses, the process proceeds to step # 25, where the temperature sensor 75 detects the temperature in the dehydration tank 30 again and stores it in a memory (not shown).

  In step # 30, it is determined by the humidity sensor 76 whether or not the detected humidity in the dehydrating tank 30 is lower than a predetermined value and the drying process is terminated. If it is determined that the drying process is completed, the process proceeds to step # 31 and the heater 54 is stopped.

  In step # 32, the amount of synthetic fiber contained in the laundry is calculated from the amount of laundry detected in step # 11 and the temperature change during the drying process detected in steps # 23 and # 25. That is, it is determined that the amount of synthetic fiber is small when the temperature rise in the predetermined time is small in the drying process, and that the amount of synthetic fiber is large when the temperature rise is large. This is because synthetic fibers have low water absorption and high quick drying properties. Thereby, the cloth amount detection part 78 and the temperature sensor 75 comprise the fiber detection part which detects the quantity of the fiber included in the laundry.

  When it is determined in step # 33 that the amount of synthetic fiber contained in the laundry is greater than the predetermined amount, the PCI generator 80 is driven in step # 34. When it is determined in step # 33 that the synthetic fiber is less than the predetermined amount, the PCI generator 80 is not driven and the process proceeds to step # 36.

  In step # 35, the PCI generator 80 is driven and waits until a predetermined time elapses. When a predetermined time has elapsed after starting to drive the PCI generator 80, the process proceeds to step # 36, and the driving of the PCI generator 80 and the blower 50 is stopped.

  According to this embodiment, the same effects as those of the first embodiment can be obtained, and the drive of the PCI generator 80 can be minimized and the life of the PCI generator 80 can be extended.

  In addition, the existing cloth amount detection unit 78 and the temperature sensor 75 can easily realize the fiber detection unit that detects the amount of fiber in the laundry, and therefore, without newly providing static electricity detection means, Manufacturing costs can be reduced.

  In addition, FIG. 8 is a flowchart which shows the modification of the operation control of each process of the washing / drying machine 1 which concerns on 2nd Embodiment. By arranging Step # 32 to Step # 35 after Step # 25, the PCI generator 80 can be driven during the drying process to remove the static electricity of the laundry.

  In the first and second embodiments, the concentration of ions supplied into the dehydration tank 30 may be increased when overdrying is detected in the dehydration tank 30. That is, the chemical detection unit determines that the amount of chemicals contained in the laundry is large, and the humidity sensor 76 determines whether the humidity in the dehydrating tank 30 during the drying process is lower than a predetermined value. If the drying operation continues, overdrying is detected. At this time, in addition to driving the PCI generator 80, the fan rotation speed of the blower 50 is increased to increase the PCI concentration, thereby suppressing the generation of static electricity in an overdried state.

  The present invention can be widely used in washing and drying machines.

DESCRIPTION OF SYMBOLS 1 Washing and drying machine 10 Outer box 11 Top plate 11a Entrance / exit 14 Back panel 16 Extension part 16a Vertical part 16b Horizontal part 20 Water tank 30 Dehydration tank (washing and dehydration tank)
32 balancer 33 pulsator 40 drive unit 41 motor 42 belt 43 clutch / brake mechanism 44 dewatering shaft 50 blower 51 circulation duct 51a suction port 51d outlet 54 heater 70 control unit 71 operation unit 72 display unit 73 lid open / close sensor 75 temperature sensor 76 humidity Sensor 77 Water supply valve 78 Cloth amount detection unit 80 PCI generator

Claims (6)

  A washing process in which the laundry is put into the washing and dewatering tub to perform washing, and a drying process in which warm air is sent to the washing and dehydrating tub to dry the laundry, and during or after the drying process The washing / drying machine for supplying ions to the washing and dewatering tank includes a chemical detection unit for detecting the amount of synthetic fiber contained in the laundry, and generates ions compared to when the amount of synthetic fiber is less than a predetermined amount. A washer-dryer characterized by a reduced amount.   The washing / drying machine according to claim 1, wherein the supply of ions is stopped when the amount of the synthetic fiber is less than a predetermined amount.   A cloth amount detection unit for detecting the amount of laundry and a water level sensor for detecting a water level of the washing and dewatering tub, wherein the chemical detection unit is supplied with water according to the amount of laundry. The amount of synthetic fiber contained in the laundry is detected based on a difference between a water level in the dehydration tank and a water level in the washing / dehydration tank when a predetermined time elapses after water supply. Laundry dryer.   A cloth amount detection unit that detects the amount of laundry and a temperature sensor that detects a temperature in the washing and dewatering tub, and the synthetic fiber detection unit starts the drying step when a predetermined time has elapsed. The washing / drying machine according to claim 1 or 2, wherein the amount of synthetic fiber contained in the laundry is detected by a temperature change in the washing / dehydrating tub.   The laundry dryer according to any one of claims 1 to 4, wherein the ion concentration is increased when overdrying in the washing and dewatering tub is detected.   A pulsator that stirs the laundry in the washing and dewatering tub, and a drying period in which the drying step rotates the washing and dewatering tub; and a stirring period in which the washing and dewatering tub is stopped and the pulsator is rotated. The washing / drying machine according to any one of claims 1 to 5, wherein a supply amount of ions during the stirring period is larger than that during the dehydration rotation period.

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