JP4988490B2 - Dishwasher - Google Patents

Description

  The present invention relates to a dishwashing machine that supplies rinsing water from a rinsing water tank to a rinsing nozzle by a pump and discharges the rinsing nozzle from the rinsing nozzle into a washing chamber to rinse dishes and the like.

  In a conventional dishwasher, a washing nozzle and a rinsing nozzle are rotatably arranged above and below a washing chamber, respectively, and washing and rinsing of an object to be washed such as a dish accommodated therebetween is performed (see Patent Document 1). ). This dishwasher sprays the wash water in the wash water tank downward from the wash nozzle provided in the upper part of the wash chamber and the upward from the wash nozzle provided in the lower part by the wash water pump. Wash the washed items from above and below and perform the washing operation.

  Thereafter, the rinsing water in the rinsing water tank is fed to the rinsing nozzles provided above and below the cleaning chamber by the rinsing water pump. The rinsing water is sprayed downward from the rinsing nozzle provided at the upper part, and the detergent and washing water adhering to the object to be washed are washed away from above and below by being jetted upward from the rinsing nozzle provided at the lower part. This rinsing operation is performed to complete one cycle of operation. The rinse water sprayed from the rinse water tank is collected in the wash water tank and used as the wash water for the next cycle. Further, the rinsing water tank is provided with a water level sensor, and when the rinsing water is reduced by the rinsing operation as described above and falls below a predetermined water level, the water supply electromagnetic valve is opened and water is supplied.

The washing water tank and the rinsing water tank are each provided with a heater, and the water stored in these tanks is heated to a predetermined temperature by this heater to be hot water. Thereby, the chemical activity of the detergent was increased, and the cleaning efficiency was improved.
JP 2002-28124 A

  However, when the water supply solenoid valve is opened simultaneously with the start of the rinsing operation and water is supplied to the rinsing water tank, low-temperature rinsing water that has not yet been heated to a predetermined temperature by the heater is drawn into the rinsing water pump, It may be fed to a rinse nozzle in the cleaning chamber. In this case, low-temperature rinse water is jetted to the tableware in the cleaning chamber.

  Therefore, since the dishes in the washing room cannot be rinsed with high-temperature rinse water, sterilization with high-temperature hot water cannot be performed, causing a problem in terms of hygiene.

  Therefore, the present invention has been made to solve the conventional technical problem, avoids the disadvantage of rinsing water having a temperature lower than that of the rinsing nozzle, and sanitizes dishes in the washing room with the hot rinsing water. To provide a dishwasher that can be rinsed.

The dishwasher of the invention of claim 1 is a device for supplying rinsing water from a rinsing water tank to a rinsing nozzle by a pump and discharging the rinsing water into the washing chamber from the rinsing nozzle to rinse rinsing water. A water level sensor for detecting a predetermined full water level, a valve device for controlling water supply to the rinse water tank, a heater for heating the rinse water in the rinse water tank, and the rinse water in the rinse water tank by the heater And a control device for controlling the valve device based on the output of the water level sensor and stopping the water supply to the rinse water tank at the full water level. The control device is characterized in that after the start of the rinsing step, the valve device is opened after a predetermined time has elapsed and water supply to the rinsing water tank is started.

A dishwasher according to a second aspect of the invention supplies rinsing water to a rinsing nozzle by a pump from a rinsing water tank, and discharges the rinsing water into the washing chamber from the rinsing nozzle to rinse rinsing water. A water level sensor for detecting a predetermined full water level, a valve device for controlling water supply to the rinse water tank, a heater for heating the rinse water in the rinse water tank, and the rinse water in the rinse water tank by the heater Is heated to a predetermined temperature, and the pump is operated for a predetermined rinsing time to execute a rinsing process, and the valve device is controlled based on the output of the water level sensor to stop water supply to the rinsing water tank at the full water level. And a control device, wherein the control device opens the valve device and starts water supply to the rinsing water tank before a predetermined time when the rinsing time elapses.

According to the first aspect of the present invention , in a dishwasher for supplying rinse water from a rinse water tank to a rinse nozzle by a pump and discharging the rinse water from the rinse nozzle into a washing chamber to rinse dishes, etc. A water level sensor for detecting the full water level of the water, a valve device for controlling water supply to the rinsing water tank, a heater for heating the rinsing water in the rinsing water tank, and a predetermined amount of rinsing water in the rinsing water tank by the heater. And a control device for controlling the valve device based on the output of the water level sensor and stopping the supply of water to the rinse water tank at the full water level. Since the control device opens the valve device after a predetermined time has elapsed after the start of the rinsing process and starts supplying water to the rinsing water tank, the water just supplied is pumped even if the valve device is opened. It is possible to start the water supply to the rinsing water tank by opening the valve device from being a time that does not reach the more rinsing nozzles.

  For this reason, it is possible to avoid the disadvantage that the low-temperature rinse water just supplied to the rinse water tank that does not reach the predetermined high temperature is discharged into the cleaning chamber. Therefore, in the rinsing step, it becomes possible to always rinse the tableware and the like in the washing room with the rinsing water having a high temperature, and it can be made hygienic.

According to the second aspect of the present invention , in the dishwasher for supplying rinse water from the rinse water tank to the rinse nozzle by a pump and discharging the rinse water from the rinse nozzle into the washing chamber to rinse dishes, etc. A water level sensor for detecting the full water level of the water, a valve device for controlling water supply to the rinsing water tank, a heater for heating the rinsing water in the rinsing water tank, and a predetermined amount of rinsing water in the rinsing water tank by the heater. A control device that heats the pump to a predetermined temperature, operates the pump for a predetermined rinsing time, executes a rinsing process, controls the valve device based on the output of the water level sensor, and stops water supply to the rinsing water tank at the full water level The control device opens the valve device and starts water supply to the rinsing water tank before the rinsing time elapses, so that water is supplied even when the valve device is opened. Water it is possible to start the water supply to the rinsing water tank by opening the valve device from being a time that does not reach the rinse nozzle by a pump.

  For this reason, it is possible to avoid the disadvantage that the low-temperature rinse water just supplied to the rinse water tank that does not reach the predetermined high temperature is discharged into the cleaning chamber. Therefore, in the rinsing step, it becomes possible to always rinse the tableware and the like in the washing room with the rinsing water having a high temperature, and it can be made hygienic.

Hereinafter, embodiments of the present invention will be described with reference to the drawings .

  1 is a perspective view of the dishwasher 1 of the present invention, FIG. 2 is a sectional view of the dishwasher 1 of the present invention, FIG. 3 is a partially enlarged vertical side view of the dishwasher 1, and FIG. It is a block diagram.

  Reference numeral 1 denotes a dishwasher, and an opening 2 </ b> A for storing and taking out a washing rack 5 in which an object to be washed 4 such as tableware is accommodated is formed on the front surface of a main body 2 constituting the dishwasher 1. The cleaning chamber 3 is partitioned. The front opening 2A of the cleaning chamber 3 is closed by the opening / closing door 6 so as to be freely opened and closed. The door 6 is provided with a door switch 7 (only FIG. 4 is shown) for detecting whether the door 6 is opened or closed. An operation panel 33 having a power switch 32 and a display unit 36 (only FIG. 4 is shown) is provided on the upper front surface of the main body 2.

  An upper cleaning arm 8 having a plurality of cleaning nozzles 8A for spraying cleaning water downward is rotatably disposed above the cleaning chamber 3. An upper rinse arm 9 that rotates concentrically with the upper cleaning arm 8 is disposed slightly below the upper cleaning arm 8. The upper rinsing arm 9 has a plurality of rinsing nozzles (not shown) for injecting rinsing water downward. A lower cleaning arm 10 having a plurality of cleaning nozzles 10A for jetting cleaning water upward is rotatably disposed in the lower portion of the cleaning chamber 3. A lower rinsing arm 11 having a plurality of rinsing nozzles (not shown) for jetting rinsing water upward is disposed slightly above the lower cleaning arm 10 so as to be rotatable concentrically with the lower cleaning arm 10.

  On the other hand, a relatively large cleaning water tank 14 is provided below the cleaning chamber 3 and separated from the cleaning chamber 3 by a filter 13. An overflow pipe 15 is erected in the washing water tank 14 and opens into the washing water tank 14 at a position where the washing water surface of the washing water tank 14 is regulated to a predetermined water level. Further, a cleaning water tank heater 16 (only FIG. 4 is shown) is accommodated in the cleaning water tank 14 in order to maintain the cleaning water at a predetermined temperature. Further, in order to detect the water temperature in the cleaning water tank 14, a cleaning water tank temperature sensor 17 (only FIG. 4 is shown) is inserted from the outer wall below the water level. The cleaning water stored in the cleaning water tank 14 is mixed with a detergent. The cleaning water is sucked and pumped by the cleaning water pump 18, and the upper and lower cleaning nozzles are discharged via the discharge pipe 19 and the cleaning pipe 20. The upper and lower cleaning arms 8 and 10 on which 8A and 10A are formed are fed.

  On the other hand, a rinsing water tank 22 for storing hot rinsing water at + 83 ° C. is disposed at the lower part of the main body 2 as shown in FIG. A water supply pipe 31 for supplying water into the rinse water tank 22 from an external water pipe (not shown) is connected to the upper portion of the rinse water tank 22, and the water supply pipe 31 is connected to the rinse water tank 22. A water supply electromagnetic valve (valve device) 30 for controlling the water supply is provided. Further, a rinse water outlet 49 is formed at the lower part of the rinse water tank 22, and the rinse water pump 23 is connected to the rinse water outlet 49 via a water supply pipe 50.

  Thereby, the stored water in the rinsing water tank 22 is pumped by the rinsing water pump 23 and fed to the upper and lower rinsing arms 9 and 11 where the upper and lower rinsing nozzles are formed via the rinsing pipe 24. Further, a rinse water tank water level sensor 27 for detecting a full water level HW in the rinse water tank 22 is provided in the rinse water tank 22.

  A rinse water tank heater 28 for heating the stored water to the predetermined temperature is accommodated in the rinse water tank 22. Further, in order to detect the water temperature in the rinsing water tank 22, a rinsing water tank temperature sensor 29 (shown only in FIG. 4) is inserted from the outer wall below the water level.

  Next, a control device C for realizing the present invention will be described with reference to the electric block diagram of FIG. In FIG. 4, C is a control device composed of a general-purpose microcomputer, and has a built-in timer 34 as a time limit means. On the input side of the control device C, a door switch 7, an operation panel 33 provided with a power switch 32 and a display unit 36, and a washing water level sensor (washing water tank water level provided in the washing water tank 14). Sensor) 43, the rinse water tank water level sensor 27, the washing water tank temperature sensor 17, and the rinse water tank temperature sensor 29 are connected.

  Further, on the output side of the control device C, a washing water tank heater 16, a rinsing water tank heater 28, a washing water pump motor 18M of the washing water pump 18, and a rinsing water pump motor 23M of the rinsing water pump 23 are provided. A water supply electromagnetic valve 30 is connected.

  With the above configuration, the operation of the dishwasher 1 of the present invention will be described. First, when the power switch 32 provided on the operation panel 33 of the dishwasher 1 is turned on, the control device C opens the water supply electromagnetic valve 30 and executes a water supply process of supplying rinse water into the rinse water tank 22. To do.

(Water supply process)
In this water supply process, the tap water outside the water supply pipe 31 is stored in the rinse water tank 22 as rinse water by opening the water supply electromagnetic valve 30. Then, the control device C operates the rinse water pump motor 23M. Accordingly, the rinsing water is gradually pumped up by the rinsing water pump 23 and is pumped to the upper and lower rinsing nozzles 9 and 11 through the rinsing pipe 24.

  The pumped rinse water is discharged from the upper and lower rinse nozzles and stored in the lower wash water tank 14. When each tank 14 and 22 reaches a predetermined full water level based on the outputs of the water level sensors 27 and 43, the control device C closes the water supply electromagnetic valve 30 and ends the water supply process. And the control apparatus C transfers to a pre-heating process, supplies with electricity to the washing water tank heater 16 and the rinse water tank heater 28, and heats the water temperature in each tank 14 and 22 until it becomes predetermined temperature.

  Thereafter, the rinse water in the rinse water tank 22 is maintained at + 83 ° C. by the action of the rinse water tank temperature sensor 29, and the wash water in the wash water tank 14 is maintained at + 65 ° C. by the action of the wash water tank temperature sensor 17. . In addition, a detergent is introduced into the cleaning water tank 14 so as to obtain an appropriate concentration.

  Thereafter, when the user places the cleaning rack 5 on which the object to be cleaned 4 such as a dish is placed in the cleaning chamber 3 and closes the door 6, the control device C shifts to the cleaning process.

(Washing process)
In this cleaning process, the control device C operates the cleaning water pump motor 18M. As a result, the cleaning water pump 18 starts rotating, the cleaning water is pumped to the upper and lower cleaning arms 8 and 10, and the dirt adhering to the object to be cleaned 4 is washed away by the cleaning water sprayed from the cleaning nozzles 8 </ b> A and 10 </ b> A. . The energization of the washing water pump motor 18M and the rinsing water pump motor 23M is not performed unless the door 6 is closed and the door switch 7 is turned on.

  The washing water sprayed as described above falls into the washing water tank 14 below, is again sucked into the washing water pump 18, and thereafter circulates through the same route. After performing this operation for a preset time set in advance, the controller C cuts off the energization of the cleaning water pump motor 18M, stops the operation of the cleaning water pump 18, ends the cleaning process, and the rinsing process. Migrate to

(Rinsing process)
In the rinsing process, the control device C energizes the rinsing water pump motor 23M to rotate the rinsing water pump 23, and pumps hot rinsing water at + 83 ° C. to the upper and lower rinsing arms 9 and 11. Thereby, the detergent and washing water adhering to the surface of the article to be cleaned 4 are rinsed off by the rinsing water sprayed from the rinsing nozzle. After performing this operation for a preset rinsing time, the controller C cuts off the energization to the rinsing water pump motor 23M, stops the rinsing water pump 23, and ends the rinsing process. Thereafter, the control device C sounds a buzzer (not shown) to notify that a series of cleaning operations has been completed. The rinse water discharged into the cleaning chamber 3 falls into the lower cleaning water tank 14 and is reused as cleaning water in the next cleaning operation.

By performing the rinsing process as described above, the hot rinsing water in the rinsing water tank 22 is reduced, and the water level is lowered. Here, with reference to the flowchart of FIG. 5, the reference example of the water supply control of the rinse water tank 22 is demonstrated.

  First, in step S1, the control device C determines whether or not the rinsing time as described above has elapsed and the rinsing process is completed. Until the rinsing process is completed, even if the detection of the full water level HW by the rinsing water tank water level sensor 27 is turned off during the rinsing process, the opening of the water supply electromagnetic valve 30 is prohibited.

  If the control device C determines that the rinsing process has been completed, the control device C proceeds to step S2 and opens (ON) the water supply electromagnetic valve 30. Thereby, external tap water is supplied through the water supply piping 31 in the rinsing water tank 22 whose water level has been lowered by the rinsing process.

  Thereafter, the control device C proceeds to step S3, determines whether or not a predetermined full water level HW is detected by the rinse water tank water level sensor 27, and proceeds to step S4 based on the detection of the predetermined full water level HW. Then, the water supply electromagnetic valve 30 is closed (OFF).

Thereafter, the control device C controls the energization of the rinsing water tank heater 28 based on the temperature detected by the rinsing water tank temperature sensor 29 in the same manner as in the water supply process as described above, thereby rinsing water in the rinsing water tank 22 to a predetermined temperature. In this reference example , the temperature is raised to + 83 ° C., and then the temperature is maintained.

  By performing the water supply control of the rinsing water tank 22, it is possible to avoid supplying low-temperature water from the outside into the rinsing water tank 22 through the water supply pipe 31 during the rinsing process. it can.

For this reason, in this reference example , in the present reference example , it is possible to avoid the inconvenience that low temperature rinse water less than + 83 ° C. is discharged into the cleaning chamber 3 in the rinse step. Therefore, in the rinsing step, the object to be cleaned 4 in the cleaning chamber 3 can be sterilized by high-temperature rinsing water always heated to a predetermined temperature, so that it can be sanitized.

Next, the water supply control of the rinse water tank 22 as Example 1 is demonstrated with reference to the flowchart of FIG. In addition, since the dishwasher 1 in the said Example 1 is the structure substantially the same as the dishwasher 1 of the reference example mentioned above, description is abbreviate | omitted.

In the dishwasher in the first embodiment , first, in step S5, the control device C starts the rinsing process as described above. Specifically, a predetermined time has elapsed since the operation of the rinsing water pump 23 was started. Determine whether or not. Note that until the predetermined time has elapsed, even if the detection of the full water level HW by the rinsing water tank water level sensor 27 is turned off during the rinsing process, the opening of the water supply electromagnetic valve 30 is prohibited.

  Here, the predetermined time is the low-temperature water supplied from the water supply pipe 31 into the rinse water tank 22 by opening the water supply electromagnetic valve 30 according to the positional relationship between the connection position of the water supply pipe 31 and the rinse water outlet 49. In consideration of the time required for the water to reach the rinsing water outlet 49 and the time required for the rinsing process (rinsing time), the low temperature just supplied to the rinsing water tank 22 from the water supply pipe 31 even if the water supply electromagnetic valve 30 is opened. The time when it is determined that the water does not reach the rinse water outlet 49. In this embodiment, the time until the low-temperature water reaches the rinsing water outlet 49 is considered. However, the present invention is not limited to this. The time required to reach the rinsing arms 9 and 11 on the upstream side of the nozzle may be used.

  If the control device C determines that the predetermined time has elapsed, the control device C proceeds to step S6 and opens (ON) the water supply electromagnetic valve 30. Thereby, external tap water is supplied through the water supply piping 31 in the rinsing water tank 22 whose water level has been lowered by the rinsing process. At this time, the rinsing process is executed. As described above, the predetermined time is the low-temperature water just supplied into the rinsing water tank 22 by the water supply pipe 31 even when the water supply electromagnetic valve 30 is opened. However, in the remaining rinsing process, the low-temperature water just supplied into the rinsing water tank 22 does not reach the rinsing water outlet 49.

  Thereafter, the control device C proceeds to step S7, determines whether or not a predetermined full water level HW is detected by the rinse water tank water level sensor 27, and proceeds to step S8 based on the detection of the predetermined full water level HW. Then, the water supply electromagnetic valve 30 is closed (OFF).

  Thereafter, the control device C controls the energization of the rinsing water tank heater 28 based on the temperature detected by the rinsing water tank temperature sensor 29 in the same manner as in the water supply process as described above, thereby rinsing water in the rinsing water tank 22 to a predetermined temperature. In this embodiment, the temperature is raised to + 83 ° C., and then the temperature is maintained.

  By executing the water supply control of the rinsing water tank 22, the water just supplied from the water supply pipe 31 is rinsed by the rinsing water pump 23 even if the water supply electromagnetic valve 30 is opened during the rinsing process. It does not reach the nozzle.

  Therefore, water supply to the rinsing water tank 22 can be started at an early stage, and in the present embodiment, low-temperature rinsing water of less than + 83 ° C. in this embodiment is discharged into the cleaning chamber 3 during the rinsing process. It is possible to avoid the inconvenience. Therefore, in the rinsing step, the object to be cleaned 4 in the cleaning chamber 3 can be sterilized by high-temperature rinsing water always heated to a predetermined temperature, so that it can be sanitized.

Next, water supply control of the rinse water tank 22 as Example 2 will be described with reference to the flowchart of FIG. In addition, since the dishwasher 1 in the said Example 2 is the structure substantially the same as the dishwasher 1 of the reference example mentioned above similarly to the said Example 1 , description is abbreviate | omitted.

In the dishwasher according to the second embodiment , first, in step S9, the control device C determines whether a time corresponding to a predetermined time before the rinsing time required for the rinsing process as described above has elapsed, for example, 5 seconds before. Determine whether. Until the predetermined time has elapsed, even if the detection of the full water level HW by the rinse water tank water level sensor 27 is turned off during the rinsing process, the opening of the water supply electromagnetic valve 30 is prohibited.

  In this embodiment, the predetermined time before the rinsing time elapses is set to 5 seconds before the rinsing time elapses. However, the present invention is not limited to this. For example, the capacity of the rinsing water tank 22 is large, or When the time required for the rinse water supplied from the water supply pipe 31 to the rinse water tank 22 to be sucked from the rinse water outlet 49 by the operation of the rinse water pump 23 is long, it may be set longer. On the other hand, when the time is short, it may be set shorter. Further, the time can be arbitrarily set.

  If the control device C determines that a time corresponding to a predetermined time before the rinsing time has elapsed, the control device C proceeds to step S10 and opens (ON) the water supply electromagnetic valve 30. Thereby, external tap water is supplied through the water supply piping 31 in the rinsing water tank 22 whose water level has been lowered by the rinsing process. At this time, the rinsing step is executed, but the time corresponding to the predetermined time before the rinsing time elapses is supplied into the rinsing water tank 22 by the water supply pipe 31 even if the water supply electromagnetic valve 30 is opened. The time when fresh low temperature water does not reach the rinse water outlet 49 is set. Therefore, in the remaining rinsing process, the low-temperature water just supplied into the rinsing water tank 22 does not reach the rinsing water outlet 49.

  Thereafter, the control device C proceeds to step S11, determines whether or not a predetermined full water level HW is detected by the rinse water tank water level sensor 27, and proceeds to step S8 based on the detection of the predetermined full water level HW. Then, the water supply electromagnetic valve 30 is closed (OFF).

  Thereafter, the control device C controls the energization of the rinsing water tank heater 28 based on the temperature detected by the rinsing water tank temperature sensor 29 in the same manner as in the water supply process as described above, thereby rinsing water in the rinsing water tank 22 to a predetermined temperature. In this embodiment, the temperature is raised to + 83 ° C., and then the temperature is maintained.

  By executing the water supply control of the rinsing water tank 22, the water just supplied from the water supply pipe 31 is rinsed by the rinsing water pump 23 even if the water supply electromagnetic valve 30 is opened during the rinsing process. It does not reach the nozzle.

  Therefore, water supply to the rinsing water tank 22 can be started at an early stage, and in the present embodiment, low-temperature rinsing water of less than + 83 ° C. in this embodiment is discharged into the cleaning chamber 3 during the rinsing process. It is possible to avoid the inconvenience. Therefore, in the rinsing step, the object to be cleaned 4 in the cleaning chamber 3 can be sterilized by high-temperature rinsing water always heated to a predetermined temperature, so that it can be sanitized.

It is a perspective view of the dishwasher of this invention. It is sectional drawing of the dishwasher of this invention. It is a partial expanded vertical side view of a dishwasher. It is an electrical block diagram of a control apparatus. It is a flowchart which shows the water supply control of a rinse water tank. (Reference example) It is a flowchart which shows the water supply control of a rinse water tank. Example 1 It is a flowchart which shows the water supply control of a rinse water tank. (Example 2)

C Controller 1 Dishwasher 3 Washing room 4 Object to be washed 8 Upper washing arm 8A Washing nozzle 9 Upper rinse arm 10 Lower washing arm 10A Washing nozzle 11 Lower rinse arm 14 Washing water tank 16 Washing water tank heater 17 Washing water tank temperature Sensor 18 Wash water pump 19 Discharge pipe 20 Wash pipe 22 Rinsing water tank 23 Rinsing water pump 24 Rinsing pipe 27 Rinsing water tank water level sensor 28 Rinsing water tank heater 29 Rinsing water tank temperature sensor 30 Water supply solenoid valve (valve device)
31 Water supply piping 34 Timer (time limit means)
49 Rinse water outlet 50 Water supply piping

Claims (2)

In a dishwasher for supplying rinse water from a rinse water tank to a rinse nozzle by a pump and discharging the rinse water from the rinse nozzle into a washing chamber to rinse dishes, etc.
A water level sensor for detecting a predetermined full water level of the rinse water tank;
A valve device for controlling the water supply to the rinse water tank;
A heater for heating the rinse water in the rinse water tank;
The heater heats the rinsing water in the rinsing water tank to a predetermined temperature, operates the pump to execute a rinsing step, controls the valve device based on the output of the water level sensor, and And a controller for stopping water supply to the rinse water tank at
The control device opens the valve device after a predetermined time has elapsed after the start of the rinsing step and starts water supply to the rinsing water tank. In a dishwasher for supplying rinse water from a rinse water tank to a rinse nozzle by a pump and discharging the rinse water from the rinse nozzle into a washing chamber to rinse dishes, etc.
A water level sensor for detecting a predetermined full water level of the rinse water tank;
A valve device for controlling the water supply to the rinse water tank;
A heater for heating the rinse water in the rinse water tank;
The heater heats the rinsing water in the rinsing water tank to a predetermined temperature, operates the pump for a predetermined rinsing time , executes a rinsing step, and controls the valve device based on the output of the water level sensor. A controller for stopping water supply to the rinse water tank at the full water level,
The control device opens the valve device and starts water supply to the rinsing water tank before a predetermined time when the rinsing time elapses .

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