JP7685693B2 - dishwasher - Google Patents

Description

The present invention relates to a built-in type dishwasher that washes and dries tableware.

A dishwasher having the configuration shown in FIG. 11 has been disclosed (see, for example, Patent Document 1).

Figure 11 is a vertical cross-sectional side view of a conventional dishwasher. The body 14 of the dishwasher is open at the front. Inside the body 14, a cleaning tub 15 with an open top is provided so that it can be pulled out forward. The dashed dotted line in Figure 11 indicates the state in which the cleaning tub 15 is pulled out.

In the dishwasher, the washing nozzle 8, the dish basket 4, and the heater (not shown) are provided inside the washing tank 15. The washing pump 7 and the water supply valve 9 are provided outside the washing tank 15. The water supply valve 9 is connected to a water supply and introduces tap water, which becomes the washing water, into the washing tank 15. The washing pump 7 circulates the washing water stored in the washing tank 15. The washing nozzle 8 is provided rotatably inside the washing tank 15 and sprays the washing water pressured by the washing pump 7. The dish basket 4 is provided detachably inside the washing tank 15. The dish basket 4 holds the dishes 3 contained therein. The dish basket 4 is configured so that the washing water sprayed from the washing nozzle 8 hits the dishes 3 efficiently. The heater (not shown) heats the washing water or the air for drying.

The cleaning tank 15 has a slide rail 16 on its outer side. The main body 14 has a slide rail 17 on its inner side. The slide rail 16 slides while being held by the slide rail 17. The cleaning tank 15 is supported by the main body 14 via the slide rail 16 and the slide rail 17 of the main body 14. This allows the cleaning tank 15 to be pulled out of the main body 14 and pushed into the main body 14.

The inner lid 21 is provided at the top of the main body 14 and is arranged to close the opening on the top of the cleaning tank 15. In other words, the inner lid 21 is configured to close the opening on the top of the cleaning tank 15 via the packing 22 when the cleaning tank 15 is stored in the main body 14.

The washing tub 15 has a door 23 at the front. When the washing tub 15 is housed in the main body 14, the door 23 covers the opening at the front of the main body 14. The door 23 has a handle 24 and an operation switch at the top of the front. The handle 24 is used when the user places his or her hand on the washing tub 15 to pull it out or push it in. The operation switch is operated by the user to set the washing operation of the dishwasher, such as the wash step, rinse step, and dry step.

The cleaning tank 15 is provided with a rack gear 18 on its lower part, with gear teeth formed in a straight line. In this case, the length of the rack gear 18 is configured to be longer than the stroke by which the cleaning tank 15 is pulled out from the main body 14. A drive motor 19 having a reduction mechanism is fixed to the main body 14. A gear 20 that meshes with the rack gear 18 is attached to the motor shaft of the drive motor 19. The drive motor 19 is configured to be capable of rotating forward or backward. The cleaning tank 15 is driven by the drive motor 19 via the rack gear 18.

This is how a conventional dishwasher is constructed.

The operation of a dishwasher with the above configuration is described below.

First, the user pulls out the washing tank 15 from the main body 14 and places the tableware 3 in the washing tank 15. At this time, the user can pull out the washing tank 15 by placing his/her hand on the handle 24, or by operating the operation switch to drive the drive motor 19 to pull out the washing tank 15.

The following describes an example of a dishwasher in which the washing tub 15 is automatically pulled out by the drive motor 19.

Specifically, when a user operates the operation switch, the control device (not shown) rotates the drive motor 19 forward at a constant speed, and rotates the gear 20 attached to the motor shaft in a specified direction. At this time, the rotational force of the gear 20 acts to push out the meshed rack gear 18. As a result, the washing tub 15 comes out to the front from inside the main body 14 while the slide rails 16 and 17 slide. When the washing tub 15 comes out to an arbitrarily set position, such as a position where tableware 3 can be contained, the control device stops the drive of the drive motor 19, and stops the movement of the washing tub 15.

Next, the user places the dishes 3 in the dish basket 4 in the washing tub 15 and pours detergent into the washing tub 15. At this time, the tip of the washing tub 15, which has been pulled out, drops due to the weight of the dishes 3 contained therein.

Next, when the user operates the operation switch, the control device rotates the drive motor 19 in the reverse direction. At this time, the rotational force of the gear 20 acts to retract the meshed rack gear 18. As a result, the cleaning tank 15 is retracted and accommodated within the main body 14 while the slide rails 16 and 17 slide. Once the cleaning tank 15 is accommodated within the main body 14, the control device drives the inner lid 21. As a result, the top opening of the cleaning tank 15 is closed by the inner lid 21.

Next, the user operates the operation switch to set the wash course and start the washing operation of the dishwasher. This causes the control device to control the washing pump 7, water supply valve 9, heater, drain pump (not shown), etc., to wash the dishes 3 stored in the dish basket 4. At this time, the control device controls each of the above elements to perform the washing operation in the set order of, for example, the washing step, the rinsing step, and the drying step.

When the washing operation is finished, the user removes the dishes 3. Specifically, the user operates the operation switch in the same way as before the washing operation. This causes the control device to rotate the drive motor 19 and pull out the washing tub 15 to a specified position. At this time, due to the smooth rotation of the drive motor 19, the dishes 3 contained in the washing tub 15 are pulled out without touching each other.

This is how a conventional dishwasher works.

In addition, in conventional dishwashers, a decorative panel made of the same material and with the same design as the doors and drawers of the system kitchen is attached to the lower front part of the door 23. This decorative panel improves the design of the system kitchen.

However, the handles, operating switches, etc. are usually designed specifically for the dishwasher. Therefore, the design of the handles 24, operating switches, etc. cannot be perfectly matched to the design of the system kitchen.

In addition, in recent years, with the diversification of system kitchen designs, there are dishwashers that have innovative drawers with no handles, and are driven by electric motors. Therefore, the design of these drawers also needs to match the design of the system kitchen in which they are installed.

Furthermore, there are dishwashers that are equipped with mechanisms that push out drawers slightly, such as push rods used in drawers and doors of household appliances such as refrigerators, and are not limited to drawers like furniture. However, dishwashers equipped with such mechanisms only allow the drawer to open (pull out) a small amount. As a result, the user must reach into the drawer and pull it out further to the desired position.

Therefore, the dishwasher described in Patent Document 1 is configured to stop the drive motor and movement of the washing tub when the washing tub is pulled out to a set position. Furthermore, Patent Document 1 suggests that the washing tub is pulled out to a sufficient position so that tableware can be set immediately.

However, the dishwasher in Patent Document 1 does not disclose how to set and control the stopping position of the washing tub.

In addition, when the cleaning tank is pulled out via the drive motor, the control device must control the door so that it does not come into contact with, for example, the user or other objects in front of the door. However, such control methods are not disclosed.

JP 2002-345712 A

To provide a user-friendly dishwasher which is adapted to the diversifying designs of system kitchens and allows the door body and washing tub to be easily pulled out even when the door body covering the front surface of the dishwasher has no operation switch.

The dishwasher of the present invention comprises a housing having a front opening on the front side, a moving part including a dish basket for storing dishes, a door body covering the front opening, and a washing tub. The dishwasher further comprises a drive device having a drive unit for moving the moving part forward at least to a position where dishes can be stored , and a control unit for controlling at least the driving of the drive device. The drive device has the drive device, a pinion gear driven by the drive device, and a rack gear that meshes with the pinion gear and is formed by arranging teeth facing downward and in a straight line . The drive device is configured such that the pinion gear is fixed to the inside of the housing so as to be located near the front opening, and the rack gear is fixed to the washing tub and has a length at least equal to or greater than the stroke by which the washing tub is pulled out .

With this configuration, even if the door covering the front of the dishwasher does not have an operating part, the drive unit can automatically pull out the movable part to a position where dishes can be stored. This improves the ease of use of the dishwasher.

It can also be easily adapted to the ever-diversifying designs of system kitchens.

In other words, the dishwasher of the present invention provides a user-friendly dishwasher that allows dishes to be easily placed in the washing tub even if the door does not have an operating unit.

FIG. 1 is a side vertical cross-sectional view of a dishwasher according to a first embodiment of the present invention. FIG. 2 is a side vertical cross-sectional view of the dishwasher according to the embodiment. FIG. 3 is a side vertical cross-sectional view of a dishwasher according to a second embodiment of the present invention. FIG. 4 is a side vertical cross-sectional view of the dishwasher according to the embodiment. FIG. 5 is a side vertical cross-sectional view of a dishwasher according to a third embodiment of the present invention. FIG. 6 is a perspective view of a dishwasher according to a fourth embodiment of the present invention. FIG. 7 is a front vertical sectional view of the dishwasher according to the embodiment. FIG. 8 is an enlarged view of a main portion of FIG. FIG. 9 is a side vertical sectional view of a dishwasher according to another embodiment of the present invention. FIG. 10 is a vertical sectional side view of a dishwasher according to another embodiment of the present invention. FIG. 11 is a vertical cross-sectional side view of a conventional dishwasher.

The following describes an embodiment of the present invention with reference to the drawings. Note that the present invention is not limited to this embodiment.

(Embodiment 1)
Hereinafter, a dishwasher according to a first embodiment of the present invention will be described with reference to Figs. 1 and 2.

Figures 1 and 2 are side cross-sectional views of a dishwasher with a pull-out washing tub in embodiment 1 of the present invention. Figure 1 shows the washing tub stored in the housing. Figure 2 shows the washing tub pulled out until the top opening is fully open from inside the housing. The dishwasher of this embodiment is used, for example, by being incorporated into a system kitchen K.

As shown in FIG. 1, the dishwasher of this embodiment includes a housing 31, a washing tank 33, a door body 40, a control unit 44, a drive unit 51, etc.

The housing 31 has a front opening 32 that is open across the entire front surface. The cleaning tank 33 is movable in the front-rear direction relative to the housing 31 and can be inserted and removed through the front opening 32 of the housing 31.

In this embodiment, as shown in the figure, the forward direction is the direction in which the door body 40 and the washing tank 33 are pulled out, and the rear direction is the direction in which the washing tank 33 is stored and the door body 40 is closed. In addition, in the following description, the side on which the dishwasher is installed is referred to as the lower side, the opposite side as the upper side, and further, the right side facing the front of the door body 40 is referred to as the right side, and the left side is referred to as the left side.

The housing 31 is provided with slide rails 31a that are installed in a substantially horizontal direction (including the horizontal direction) on the inner side of both left and right side surfaces. The washing tank 33 is provided with slide rails 34 that are installed in a substantially horizontal direction (including the horizontal direction) on the outer side of both left and right side surfaces. The washing tank 33 is supported by the slide rails 31a of the housing 31 via the slide rails 34, and moves along the slide rails 31a. The washing tank 33 has a top opening 35 whose entire top surface is open. Then, dishes 36 and other items to be washed are placed in a dish basket 47 that is placed in the washing tank 33 via the top opening 35.

An inner lid 37, a parallel link mechanism 38, a seal unit 39, etc. are arranged on the upper part of the housing 31. The inner lid 37 closes the upper opening 35 of the cleaning tank 33. The parallel link mechanism 38 supports the inner lid 37. The parallel link mechanism 38 is configured, for example, as two sets of parallel link mechanisms, one on the left and one on the right, and one on the front and rear, and drives the inner lid 37 in the up and down direction. The seal unit 39 is provided on the outer periphery of the lower surface of the inner lid 37. The seal unit 39 seals the upper opening 35 of the cleaning tank 33 when the inner lid 37 is lowered. In addition, the parallel link mechanism 38 lifts the inner lid 37 when the cleaning tank 33 is pulled out of the housing 31. As a result, the inner lid 37 and the seal unit 39 are configured not to interfere with the movement of the cleaning tank 33.

The washing tank 33 has a door body 40 at the front. The door body 40 includes an operation panel 41 provided on the front of the washing tank 33, and a decorative panel 42 attached to the operation panel 41. When the washing tank 33 is stored in the housing 31, the decorative panel 42 covers the entire front opening 32 of the housing 31. The decorative panel 42 is made of the same material, color, and design as the decorative panel that is the door of the drawer or the like of the system kitchen K. Furthermore, a handle 43 is attached to the decorative panel 42. The handle 43 forms a handle that is used when the user pulls out the washing tank 33. The handle 43 is the same as that of the system kitchen K. This allows the entire system kitchen K to be configured with a unified design.

In addition, some system kitchens K do not have a handle 43 on the front of the door body 40, and have a design consisting of only the decorative panel 42. In this configuration, the washing tub 33 including the door body 40 is automatically pulled out, for example, via a drive device. At this time, for example the top or side of the decorative panel 42 becomes a handle and functions as a handle. Therefore, the dishwasher of this embodiment does not distinguish between manual operation and automatic operation when pulling out the washing tub 33.

In this embodiment, the cleaning tank 33 and the slide rail 34 are exemplified as a support mechanism that supports the housing 31 in a state in which the door body 40 can move back and forth.

The control unit 44 is disposed on the rear surface of the operation panel 41. The control unit 44 executes the washing operation while controlling all operations of the dishwasher. The washing operation includes a washing step, a rinsing step, and a drying step. The washing step is a step in which dirt on the dishes 36 and the like is removed using detergent or the like. The rinsing step is a step in which detergent and the like adhering to the dishes 36 and the like is removed. The drying step is a step in which the washed dishes 36 and the like are dried.

The control unit 44 is also configured with a printed circuit board (not shown) on which sensors such as the acceleration sensor 45 are arranged. The acceleration sensor 45 detects the magnitude of the substantial acceleration in three axial directions of the X-axis, Y-axis, and Z-axis of the dishwasher. In the dishwasher, the X-axis corresponds to the front-rear direction, the Y-axis corresponds to the left-right direction, and the Z-axis corresponds to the up-down direction. The acceleration sensor 45 detects the direction and magnitude of various accelerations that occur in the dishwasher. Specifically, the acceleration sensor 45 detects the direction and magnitude of the acceleration caused by the movement of the door body 40 and the washing tank 33 in the front-rear direction (X-axis). Furthermore, the acceleration sensor 45 detects the direction and magnitude of the acceleration caused by the vibration applied to the door body 40. Therefore, it is desirable to securely attach the printed circuit board to the operation panel 41 so that there is no problem with the mounting direction and mechanical strength. As a result, the acceleration sensor 45 mounted on the printed circuit board can more reliably and accurately detect the acceleration applied to the dishwasher.

That is, the control unit 44 controls the operation of the dishwasher based on a signal relating to the direction and magnitude of acceleration detected by the acceleration sensor 45 and the state of the door body 40 and the washing tub 33 (e.g., opening and closing operation, etc.).

The above-mentioned substantial acceleration means that the mounting angle error and the inclination angle error of the installation, and the fluctuation due to the degree, are allowed when the printed circuit board on which the acceleration sensor 45 is mounted is fixed in a predetermined position aligned with the three axial directions. In this case, the substantial acceleration also includes the case where the printed circuit board is fixed at a predetermined angle in advance, and is corrected only by the predetermined angle. However, the acceleration in the vertical and horizontal directions can be corrected by detecting the deviation from gravity.

The control unit 44 can also detect the difference between gravity and acceleration in the Z-axis direction. Therefore, when installing the dishwasher, the control unit 44 can be used as a spirit level, as described below.

The dishwasher of this embodiment is configured so that the user can operate the dishwasher by applying vibrations to the door body 40 and the washing tank 33, etc.

Specifically, there are the following methods for applying vibration:

For example, the user may apply vibration by knocking on the door body 40 with their hand, or by tapping the door body 40 with their fingertips. The user may also apply vibration by lightly tapping the door body 40 with something they are holding in their hand. If the user's hands are wet or they are holding something and cannot use their hands, the user may apply vibration by tapping the door body 40 with their elbow or knee. In short, there are no particular limitations on the method as long as the specified vibration applied to the door body 40 or the like can be transmitted to the acceleration sensor 45 and detected. In most cases, vibration is applied to the door body 40 by a method that generates sound. Therefore, hereinafter, an example of a configuration in which a dishwasher is operated by knocking on the door body 40 to apply vibration will be described.

The dishwasher of this embodiment also includes a drive unit 51 inside the housing 31. The drive unit 51 includes a drive motor 52, a pinion gear 53, and a rack gear 54 that constitute a drive unit. The drive unit 51 moves the door body 40 and the washing tank 33 at least in the forward or backward direction. Specifically, the control unit 44 drives the drive motor 52 of the drive unit 51 when a predetermined signal is received from a sensor such as the acceleration sensor 45 or the operation unit 46. The sensor is not limited to the acceleration sensor 45 as long as it detects changes such as vibrations applied to the door body 40. For example, an electrostatic sensor that detects the user's touch of the door body 40 may be used as the sensor. This allows easy operation instructions to be given with a simple operation without requiring force.

The basic control operation of the dishwasher of this embodiment will be explained below using as an example a configuration for detecting vibrations caused by knocking (hitting).

First, with the washing tub 33 housed in the housing 31 and the dishwasher in a stopped state, the user knocks on the door 40, for example, twice, for example, from the front. At this time, the acceleration sensor 45 detects vibrations applied in the front-to-rear direction, which is the same as the direction in which the washing tub 33 is pulled out. The acceleration sensor 45 outputs a predetermined detected signal to the control unit 44. As a result, the control unit 44 determines that the door 40 has been knocked by the user.

Then, the control unit 44 controls the drive motor 52 of the drive device 51 to be driven. As a result, the moving unit, which is composed of the door body 40 and the cleaning tank 33, etc., moves forward and is automatically pulled out from inside the housing 31.

The moving part includes all the parts that are driven and moved by the drive part, but the components of the moving part differ depending on the type of dishwasher. In more detail, in embodiments 1 to 3, the washing tub 33 and the door body 40 are mainly exemplified as the moving part. However, in embodiment 4 described below, the washing space 75 of the washing tub 73 is formed inside the housing 71. Therefore, the inner surface of the door body 74 forms the front surface of the washing tub 73, but the washing space 75 itself does not move. Therefore, the moving part in embodiment 4 does not include the washing tub 73. Therefore, in embodiment 4, the door body 74, the lower dish basket 77, the upper dish basket 78, and the support mechanism 80 are mainly exemplified as the moving part.

In other words, in the first to third embodiments, the cleaning tank 33 is the main component, and the cleaning tank 33, or the door body 40 and the cleaning tank 33, are described as the moving part. On the other hand, in the fourth embodiment, the door body 74 is the main component, and the moving part is described.

In addition, in the dishwasher of this embodiment, the operating unit 46 is disposed in front of the top opening 35 of the washing tub 33. The operating unit 46 is disposed, for example, on the top surface of a protrusion that protrudes from the back surface of the decorative panel 42 of the door body 40 toward the inside of the housing 31. As a result, the operating unit 46 is accommodated so as to be concealed within the housing 31 when the washing tub 33 is accommodated within the housing 31.

The operation unit 46 includes an operation button (not shown) and a display unit (not shown) such as an LED. The operation button is set by the user to control each step of the cleaning operation. The display unit displays the contents set via the operation button with an LED.

Inside the washing tank 33, a dish basket 47, a washing nozzle 48, a heater 49, etc. are further arranged. On the other hand, outside the washing tank 33, a washing pump 50 and a drying device (not shown) are arranged. The washing nozzle 48 is rotatably provided inside the washing tank 33 below the dish basket 47. The heater 49 is arranged, for example, in the space between the bottom of the washing tank 33 and the washing nozzle 48 in the washing step and the rinsing step of the washing operation. The heater 49 also heats the air inside the washing tank 33 in the drying step of the washing operation. These are arranged inside and outside the washing tank 33 together with the door body 40 including the decorative panel 42, etc., and move in the front-rear direction together with the washing tank 33.

The washing pump 50 circulates the washing water. Specifically, the washing pump 50 sucks up the washing water stored in the washing tank 33 and sprays the washing water from the washing nozzle 48 toward the dishes 36.

In other words, the moving part including the cleaning tank 33 is configured to be movable in the forward and backward directions by the drive device 51.

The drive unit 51 of this embodiment is described below.

The drive unit 51 is composed of a rack and pinion mechanism that allows the moving part to move in and out in the forward and backward directions.

The driving device 51 may be configured, for example, as a system in which a belt is wound around a pulley, or as a belt conveyor system. The driving direction may be configured to drive only in the forward direction or only in the backward direction. In this case, the non-driving direction is driven, for example, by the user.

The drive device 51 includes a drive motor 52 which is a drive section, a pinion gear 53 which is driven by the drive motor 52, a rack gear 54 which meshes with the pinion gear 53, and the like.

The rack gear 54 is formed by arranging gear teeth in a straight line. The rack gear 54 is fixed to the lower part of one of the outer left and right sides of the cleaning tank 33 that constitutes the support mechanism. The rack gear 54 has a length at least equal to or greater than the stroke by which the cleaning tank 33 is pulled out. The pinion gear 53 is attached to a motor shaft that is driven by the drive motor 52. The drive motor 52 is equipped with a reduction mechanism (not shown). The drive motor 52 is fixed inside the housing 31 with the pinion gear 53 at a position near the front opening 32.

Note that, although the rack gear 54 shown in FIG. 1 is shown with the gear teeth facing downward to mesh with the pinion gear 53, this is not limited thereto. For example, the gear teeth of the rack gear 54 may be formed facing upward or sideways to mesh with the pinion gear 53.

The above-mentioned rack gear 54 and pinion gear 53 configuration converts the rotational motion of the drive motor 52 into linear motion. The washing tub 33 is then moved linearly to a position where the top opening 35 is substantially fully open. As a result, the dish basket 47 contained in the washing tub 33 is moved upward to a position where it is substantially fully open. As the washing tub 33 moves forward, it tilts downward due to the weight of the dishes 36 contained therein. At this time, the vicinity of the pinion gear 53 provided at the front opening 32 at the front of the housing 31 becomes the fulcrum of the washing tub 33 that tilts downward. Therefore, it is unlikely that the meshing between the rack gear 54 and the pinion gear 53 will come off. This allows a simple mechanism to be used even when a separate configuration is provided to prevent the meshing from coming off.

As a configuration for preventing disengagement, for example, a configuration is available in which the drive motor 52 including the pinion gear 53 is tilted in accordance with the inclination of the cleaning tank 33. Another configuration is one in which the pinion gear 53 is pressed against the rack gear 54 in accordance with the inclination of the cleaning tank 33.

The reduction mechanism provided in the drive motor 52 is configured with a gear ratio that allows the user to easily insert and remove the cleaning tank 33 manually.

The drive device 51 from the drive motor 52 to the rack gear 54, including the reduction mechanism, may be provided with a known clutch mechanism (not shown) or slip mechanism (not shown). This reduces the load generated by the drive motor 52 when the user manually inserts and removes the cleaning tank 33. As a result, the user can insert and remove the cleaning tank 33 from the housing 31 with less force. Even if the door body 40 of the cleaning tank 33 collides with an obstacle such as a person or object when it is being pulled out, the cleaning tank 33 is easily stopped by the clutch mechanism, slip mechanism, or the like. In other words, it is possible to prevent a large force from being applied to the obstacle. Therefore, the occurrence of malfunctions due to collisions with obstacles, etc. can be more effectively reduced. Furthermore, the generation of excessive current that causes the drive motor 52 to be in a locked state is suppressed.

When manually moving the cleaning tank 33, it is preferable to have the motor circuit of the drive motor 52 cut off, as described below. This reduces the resistance generated by the drive motor 52 when manually moving the cleaning tank 33. As a result, it becomes possible to insert and remove the cleaning tank 33 with less force.

Furthermore, when the control unit 44 of this embodiment moves the washing tub 33 forward, as described above, it controls the driving of the drive motor 52 so that the top opening 35 of the washing tub 33 is substantially fully open. Note that "substantially fully open" includes a state in which the washing tub 33 is pulled out to the fullest extent and the top opening 35 is fully open, or a state in which the top opening 35 is more than half open. In other words, "substantially fully open" means a state in which the dish basket 47 is opened upward and pulled out to an extent that allows the user to put in and take out dishes 36.

Therefore, the control unit 44 controls the amount of movement of the cleaning tank 33 by the driving time of the drive motor 52.

Specifically, as described below, the control unit 44 drives the drive motor 52 for a set predetermined time T1 and then stops it. This allows the cleaning tank 33 to be stopped at any position where the top opening 35 of the cleaning tank 33 is substantially fully open.

According to this configuration, the control unit 44 detects the vibrations caused by the user knocking on the door body 40 using the acceleration sensor 45. As a result, the control unit 44 controls the drive motor 52 to automatically pull out the cleaning tank 33 forward. Therefore, the user does not need to exert any effort to pull out the cleaning tank 33.

In other words, the dishwasher of this embodiment can automatically pull out the washing tub 33 using the drive unit 51 to a position where the dishes 36 can be easily accommodated. This improves the ease of use of the dishwasher. In addition, the door body 40 that covers the front can be configured so that the operating unit 46 or handle 43 can be omitted. This allows the dishwasher to more appropriately accommodate the increasingly diverse designs of system kitchens K.

The drive device 51 of this embodiment is configured and operates as described above.

The control operation of the control unit 44 in this embodiment based on the above-mentioned predetermined time T1 will be described below.

The predetermined time T1 is set according to the control content of the dishwasher. Specifically, the predetermined time T1 is adjusted according to the moving distance and moving speed of the washing tub 33, and the magnitude of the torque of the drive motor 52 until the moving speed is reached.

In other words, if the time set for the cleaning tank 33 to be fully opened is too long, the user will feel that the movement speed is slow. On the other hand, if the time set for the cleaning tank 33 to be fully opened is too short, the movement speed of the cleaning tank 33 will be fast. Therefore, if the cleaning tank 33 comes into contact with an obstacle, there is a risk that safety for people and other obstacles will be reduced.

Taking the above into consideration, the standard moving speed of the washing tub 33 in the dishwasher of this embodiment is set to 150 mm/sec to 250 mm/sec. From the user's perspective, it is more preferable to set the moving speed to 170 mm/sec to 230 mm/sec. Setting the moving speed within the above range ensures that the user does not feel that the moving speed of the washing tub 33 is slow, and safety is also ensured.

The standard moving speed here refers to the speed at a constant speed, excluding the acceleration state when the washing tub 33 starts moving and the deceleration state before it stops. However, depending on the configuration of the dishwasher, a constant moving speed may not exist (cannot be realized). In this case, it is preferable to set the maximum moving speed to be the standard moving speed and to set the maximum speed to be within the above range. This will achieve the same effect as above.

When the cleaning tank 33 is automatically pulled out, there is a risk of it coming into contact with a person in front of the cleaning tank 33. Furthermore, when the cleaning tank 33 is stored in the housing 31, there is a risk of a person's hand or finger being pinched. Therefore, in terms of the above safety, it is also necessary to take into consideration the moving speed. In this case, it is effective in improving safety to take into consideration the kinetic energy W due to the weight and moving speed of the cleaning tank 33.

In general, kinetic energy W is expressed as W = (1/2) ^mv2 .

Note that m corresponds to, for example, the mass of the cleaning tank 33, and v corresponds to the movement speed.

Therefore, in the dishwasher of this embodiment, the kinetic energy W is set to 0.5 J or less. The setting of 0.5 J or less is a value that can reduce the impact and maintain safety even if the door body 40 comes into contact with a person while the washing tub 33 is moving, or if a person's hand or fingers are pinched when the washing tub 33 is stored. This prevents malfunctions from occurring in the event of an unforeseen incident.

Specifically, the setting of 0.5 J or less is specified based on a maximum weight of 16 kg for the washing tank 33 containing tableware 36 and the like, and a moving speed of 250 mm/sec. Therefore, if the maximum weight increases, it is preferable to reduce the moving speed so that the kinetic energy W is 0.5 J or less.

Furthermore, in the dishwasher of this embodiment, the drive motor 52 is driven for about 2 seconds, including the acceleration period when the cleaning tub 33 starts to move, so that the top opening 35 of the cleaning tub 33 is pulled out by 50%. The predetermined time T1 for driving the drive motor 52 to pull out the top opening 35 of the cleaning tub 33 to the maximum is set to about 3.5 seconds.

As described above, the drive motor 52 is configured to be capable of being driven for any set time, with the predetermined time T1 being the maximum value. This allows the cleaning tank 33 to be stopped at any pull-out position depending on the set time. In other words, the set time can be adjusted to suit the actual usage situation of the user.

For example, when using a dishwasher, it may be installed in a narrow space where there is an obstacle near the front of the dishwasher. In this case, the entire washing tub 33 cannot be pulled out. Therefore, the set time is adjusted to set the amount of washing tub 33 that needs to be pulled out. This makes it possible to install the dishwasher even in a narrow space.

In addition, in the dishwasher of this embodiment, the control unit 44 may be configured to drive the drive motor 52 with two or more different stepped voltages.

For example, a voltage higher than the standard voltage is applied during the acceleration period when the cleaning tank 33 starts to move, and a voltage lower than the standard voltage is applied during the deceleration period just before the tank is stopped to drive the drive motor 52. This increases the torque generated by the drive motor 52 when the cleaning tank 33 accelerates to start moving. As a result, the acceleration period of the cleaning tank 33 can be shortened. The above-mentioned standard voltage corresponds to the voltage applied when the cleaning tank 33 is moved at a constant speed.

On the other hand, just before the movement of the washing tub 33 is stopped, a voltage lower than the standard voltage is applied to drive the drive motor 52 to reduce the rotation speed. This reduces shock to the dishes 36 stored in the dish basket 47. As a result, contact between the dishes 36 due to shock is suppressed, preventing noise and damage. Furthermore, it is possible to reduce the splashing of water stored in the washing tub 33 due to shock. This prevents water from splashing out of the washing tub 33 or the dishes 36 from getting wet after being dried after washing.

In the above, the driving voltage is controlled in two stages, that is, when the washing tank 33 starts to move and when it stops moving, but the present invention is not limited to this. For example, the driving voltage may be applied smoothly to drive the driving motor 52 so that the moving speed changes smoothly in a shorter time. In other words, the above-mentioned two or more stepped voltages include a state in which the voltage changes linearly or smoothly. This can further reduce shocks applied to the tableware 36 and the like.

In addition, in the dishwasher of this embodiment, the movement of the washing tub 33 to a predetermined position may be stopped midway due to contact with an obstacle such as an object or a person during the movement of the washing tub 33. In this case, the control unit 44 stops the power supply to the drive motor 52 after the above-mentioned predetermined time T1 has elapsed, and stops the drive. As a result, the locked state in which the rotation of the drive motor 52 stops is a short period of time, at most the predetermined time T1. Therefore, the locked state of the drive motor 52 is not maintained for a long period of time. This prevents a load that would force the drive motor 52 to rotate from continuing for a long period of time. As a result, the drive motor 52 can be used safely and stably for a long period of time. Furthermore, the contact between the washing tub 33 and an obstacle or a person is resolved in a short time. Therefore, the occurrence of problems with the obstacle or person and problems with the dishwasher can be more reliably prevented.

Furthermore, in the dishwasher of this embodiment, it is anticipated that, on the way to the predetermined position where the washing tub 33 is set, some of the moving parts, including the door body 40, may come into contact with an obstacle, or an unexpected load may be applied. In this case, it is preferable that the control unit 44 immediately controls the driving motor 52 to stop driving.

Here, as a method for anticipating contact with an obstacle or person, for example, there is a method in which the acceleration sensor 45 detects a change in acceleration and the control unit 44 controls it. Specifically, when the acceleration sensor 45 detects an acceleration or a change in acceleration equal to or greater than a predetermined threshold in any of the three axes, including vibration in the direction of movement of the door body 40, while the drive motor 52 is being driven, the control unit 44 stops driving the drive motor 52. In this configuration, the control unit 44 immediately stops driving the drive motor 52 not only when an obstacle is contacted, but also when the user intentionally knocks on the door body 40 or a child contacts it from the side or up or down. This makes it possible to prevent malfunctions of obstacles or people that come into contact with the moving part, and maintain a high level of safety.

As a method for detecting the application of an unexpected load, for example, the acceleration sensor 45 monitors the acceleration in all directions and the control unit 44 controls it. Specifically, when the acceleration sensor 45 detects a change in acceleration that causes the driven door body 40 and the cleaning tank 33 to decelerate or stop, the control unit 44 stops the drive of the drive motor 52. There is also a method in which the control unit 44 monitors the current while the drive motor 52 is being driven and controls the drive motor 52 to stop. Specifically, when the control unit 44 detects an increase in current when the door body 40 and the cleaning tank 33 decelerate or stop, it stops the drive of the drive motor 52. Alternatively, when a current of a predetermined value or more flows through the drive motor 52 for, for example, 0.5 seconds or more and the control unit 44 detects a locked state of the drive motor 52, it stops the drive of the drive motor 52.

The above methods can be implemented without any particular limitations. The above methods may also be implemented in combination. These methods reduce the time from when the movement of the cleaning tank 33 is impeded to when the drive motor 52 is stopped. As a result, the effects of defects on obstacles, including defects such as overheating of the drive motor 52, can be more effectively prevented.

In other words, by detecting the change in acceleration or current, the cleaning tank 33 can be stopped reliably. Furthermore, by providing the above-mentioned clutch mechanism or slip mechanism, the movement of the cleaning tank 33 can be stopped immediately. Therefore, the above-mentioned configuration is useful as a method for stopping the cleaning tank 33 when a load of a predetermined value or more is applied to the door body 40 or the drive motor 52.

Furthermore, in the dishwasher of this embodiment, the control unit 44 may cut off the motor circuit as described above when the washing tub 33 is stopped midway before reaching a predetermined position and the drive motor 52 is stopped. Usually, when the washing tub 33 stops midway, the user manually tries to move the washing tub 33 forward or backward from the position where the washing tub 33 stopped. At this time, the drive motor 52 is forced to rotate freely, and a back electromotive force is generated in the drive motor 52. Therefore, when the washing tub 33 stops midway, the motor circuit of the drive motor 52 is cut off. This makes it possible to prevent the occurrence of loads such as abnormal currents flowing in the printed circuit board of the control unit 44 due to the back electromotive force of the drive motor 52 in advance. In addition, since no abnormal currents due to the back electromotive force flow, no power is generated by the drive motor 52. Therefore, the load caused by the power generation of the drive motor 52 is not large in response to the user's manual operation. As a result, even if the washing tub 33 stops midway, the user can easily move the washing tub 33 with little force.

The control unit 44 detects a specific signal, for example when the door 40 is closed, and then receives a signal to drive the drive motor 52, and then restores the motor circuit that was shut off.

As described above, the dishwasher of this embodiment is controlled by the control unit.

The operation and function of the dishwasher of this embodiment will be explained below.

The user pulls out the washing tub 33 to place the tableware 36 inside the washing tub 33. At this time, the user can also pull out the washing tub 33 manually by placing their hands on the handle 43.

Therefore, the following describes an example in which the user knocks the door 40, for example, twice, to drive the drive motor 52 and automatically move the cleaning tank 33. The reason for setting the knock detection to two times will be described later.

In this case, when a user knocks twice on the door body 40, the knock generates vibrations in the door body 40. The vibrations are transmitted from the decorative plate 42 to the operation panel 41 and then to the control unit 44 fixed to the operation panel 41. The vibrations transmitted to the printed circuit board of the control unit 44 are then detected as acceleration by the acceleration sensor 45.

In other words, when a user knocks on the door body 40 twice, the control unit 44 detects the direction and magnitude of the acceleration from the output signal of the acceleration sensor 45. Specifically, the acceleration sensor 45 detects the magnitude of acceleration in each of the three axial directions of the X-axis, Y-axis, and Z-axis.

The control unit 44 drives the drive motor 52 only when, for example, the acceleration X on the X axis is equal to or greater than a first threshold value A, the acceleration Y on the Y axis is equal to or less than a second threshold value B, and the acceleration Z on the Z axis is equal to or less than a third threshold value C, based on the magnitude of the detected acceleration in the three axial directions. In other words, only when the above conditions are met does the control unit 44 determine that the door 40 has been knocked from the front at the user's discretion. As a result, malfunctions that occur when opening or closing the cleaning tank 33 without the user's consent are prevented.

Therefore, when the acceleration X is less than the first threshold value A, the control unit 44 determines that the vibration is not coming from the front of the door body 40. Also, even if the acceleration X is equal to or greater than the first threshold value A, when the acceleration Y is equal to or greater than the second threshold value B or the acceleration Z is equal to or greater than the third threshold value C, the control unit 44 determines that the vibration is not coming from the front of the door body 40.

However, as described above, the dishwasher of this embodiment is incorporated into a system kitchen K for use. System kitchens K usually have a worktop such as a cooking counter. Therefore, when preparing food, the worktop is repeatedly struck, generating a large number of vibrations with various accelerations. Examples of striking include cutting ingredients, crushing ingredients with a pestle, and beating meat with a tool to soften it. There is also household work such as placing food and dishes on the worktop. In this case, even if an acceleration threshold is set in the three axial directions detected by the acceleration sensor as described above, the control unit 44 of the dishwasher may erroneously detect three or more vibrations as vibrations with an acceleration caused by two knocks on the door body 40. Therefore, in this embodiment, it is preferable that the control unit 44 executes control of the dishwasher only when two knocks are detected consecutively. In other words, it is preferable that the control unit 44 cancels the operation of the dishwasher when it detects vibrations equivalent to three or more consecutive knocks.

In addition, when vibrations are applied from the decorative panel 42, a strong signal in the X direction is detected. However, when vibrations are caused by hitting the worktop of the system kitchen K, a strong signal in the Z direction appears. Therefore, when the vibrations in the Z direction are stronger than the X direction, it is preferable for the control unit 44 to determine that the vibrations are not from the decorative panel 42 and control the operation of the dishwasher. This makes it possible to prevent false detections during normal housework, and more reliably prevents unintended malfunctions of the dishwasher.

Next, when the control unit 44 determines that the user has applied an action (vibration) to pull out the cleaning tank 33 based on the detected acceleration, it sounds a buzzer, for example, after 0.4 seconds. This notifies the user that the door body 40 and cleaning tank 33 have started to move.

Next, the control unit 44 drives the drive motor 52 in a predetermined direction, for example, 0.6 seconds after the determination. The drive motor 52 then moves the rack gear 54 provided at the bottom of the cleaning tank 33 forward via the pinion gear 53 provided on the motor shaft. As a result, the slide rail 34 of the cleaning tank 33 and the slide rail 31a of the housing 31 slide against each other, and the cleaning tank 33 moves forward from the front opening 32 of the housing 31 and is pulled out.

In this embodiment, the drive motor 52 is adjusted so that the cleaning tank 33 is pulled out to its fullest extent when it is driven for approximately 3.5 seconds. As a result, the cleaning tank 33 is pulled out to a position where the top opening 35 is substantially fully open, and then stops.

Next, with the top opening 35 fully open, the user places the dishes 36 into the dish basket 47 through the top opening 35.

Next, the user turns on the power switch (not shown) located in front of the top opening 35. The user then operates the operation unit 46 to set the dishwasher to a wash operation. In this embodiment, the control unit 44 is configured to be constantly energized regardless of whether the power switch is on or off. This allows the control unit 44 to be constantly on standby and ready to detect knocks by the user.

Next, when the setting of placing the dishes 36 and the washing operation is completed via the operation unit 46, the user knocks on the door body 40, for example, once. At this time, when the control unit 44 detects a single knock with the washing tub 33 pulled out, it first notifies the user with a sound, for example, via a buzzer. Thereafter, the control unit 44 drives the drive motor 52 to move the washing tub 33 backwards. As a result, the washing tub 33 is stored within the housing 31, and the door body 40 closes the front opening 32 of the housing 31. At this time, the control unit 44 detects whether the washing tub 33 is pulled out using the detection described below.
Specifically, the control unit 44 determines whether the cleaning tank 33 is completely stored by, for example, controlling the time until the cleaning tank 33 is completely stored, detecting the stored position, detecting the acceleration when the cleaning tank 33 is stored and stopped, detecting the lock current of the drive motor 52, and the like.

In the above, the cleaning tank 33 is stored automatically by driving the drive motor 52, but the method is not limited to this. For example, the cleaning tank 33 may be stored in the housing 31 by the user manually pushing the front of the door 40.

In addition, for example, a start switch (not shown) may be provided, and the user may store the washing tub 33 by pressing the start switch instead of knocking once after completing the settings. If a start switch is provided, pressing the start switch may be used as a signal that the user has completed the operation settings. In other words, if the start switch is not pressed when the washing tub 33 is stored in the housing 31 by the drive device 51 or manually, the washing operation may not start. This allows the user to store dishes 36 in the washing tub 33 once, and then, after a period of time, store more dishes 36 again, little by little.

Next, when the control unit 44 detects that the cleaning tank 33 has been put away, it executes the set cleaning operation.

When the specified washing operation is completed, the user pulls out the washing tub 33 to remove the dishes 36. Specifically, the user knocks on the door 40, for example, twice, in the same way as when storing the dishes 36. At this time, the control unit 44 notifies the user with a buzzer that the washing tub 33 has begun to be pulled out. The control unit 44 then drives the drive motor 52 to pull out the washing tub 33 to a specified position.

Next, the user removes the dishes 36 from the dish basket 47 in the washing tub 33, and then knocks on the door 40 again, for example, once. At this time, in the state shown below, the control unit 44 drives the drive motor 52 backwards to simply store the washing tub 33, and does not perform the washing operation. Specifically, for example, if the washing tub 33 is pulled out, there is no operation setting by the operation unit 46, or the start switch is not pressed, and a single knock is detected, the washing operation is not performed.

This completes the entire dishwashing process, including the user's actions.

In this embodiment, the user may unintentionally touch the decorative panel 42 or the handle 43 of the door body 40 during the washing operation of the dishwasher. In this case, it is inconvenient for the control unit 44 to detect the unintentional contact by the user and pull out the washing tub 33. Therefore, during the operation of the dishwasher, the control unit 44 may be configured not to drive the drive motor 52 when, for example, there are about two knocks, which is the same as when the dishwasher is stopped. In this case, when the acceleration sensor 45 detects, for example, three or more knocks, the control unit 44 is preferably configured to temporarily suspend the washing operation and pull out the washing tub 33. In other words, it is preferable to set the control unit 44 to pull out the washing tub 33 only when it detects an intentional action by the user. This allows the control unit 44 to prevent the execution of control unintentionally by the user. Furthermore, the control unit 44 may be provided with a function such as a so-called child lock. These configurations further improve the safety of the dishwasher.

In the present embodiment, the control unit 44 drives the drive motor 52 only when, for example, the acceleration X of the X-axis is equal to or greater than the first threshold A, the acceleration Y of the Y-axis is equal to or less than the second threshold B, and the acceleration Z of the Z-axis is equal to or less than the third threshold C, but the present embodiment is not limited to this. The dishwasher of the present embodiment is particularly incorporated in a system kitchen K, and is basically installed on the top surface of a cabinet such as a drawer or on the floor. Therefore, the transmission state of the applied vibration changes depending on the strength of the installation surface on which the dishwasher is installed. Therefore, it is preferable to set the values of the respective thresholds and combinations for the magnitude of the acceleration in the three axial directions according to the installation state of the dishwasher. This makes it possible to realize a dishwasher that is highly versatile and has excellent operability.

Specifically, when the dishwasher is installed on the top surface of the cabinet, for example, only the legs of the dishwasher come into contact with the system kitchen K. In other words, a gap is formed between the system kitchen K and the periphery of the dishwasher. In this case, a sealing material such as a sponge or a rubber sheet may be provided on the side and the front of the upper part of the housing 31 to close the gap. In this case, since the sealing material has flexibility, vibrations in the left-right and front-back directions are absorbed and transmission to the dishwasher is suppressed. Therefore, vibrations applied to the system kitchen K tend to propagate in the vertical direction. In other words, the direction of vibration that is most susceptible to the strength of the installation surface is the vertical direction. Therefore, taking the above-mentioned condition into consideration, in the setting of the Z axis corresponding to the vertical direction, instead of the above-mentioned setting of "acceleration Z is equal to or less than the third threshold C", it may be preferable to set, for example, "acceleration Z of the Z axis is equal to or greater than the fourth threshold D".

In addition, when the dishwasher is installed on the top surface of the cabinet, it is preferable to connect the system kitchen K and the dishwasher with a rigid member. This allows accurate detection of vibrations applied to the system kitchen K other than the door body 40 of the dishwasher. For example, if the front part of the housing 31 is firmly connected in the left-right and up-down directions, vibrations in the left-right Y-axis and the up-down Z-axis can be accurately detected. In this case, it is even more preferable to connect the front-back direction with flexibility. This reduces the influence of vibrations applied to the X-axis, which corresponds to the front-back direction, on the vibrations in the left-right Y-axis and the up-down Z-axis. As a result, the control unit 44 can more accurately distinguish between vibrations applied to the door body 40 and other vibrations and control the operation of the dishwasher.

As described above, the dishwasher of this embodiment is capable of assigning controls such as pulling out and pushing in the cleaning tub 33 based on a combination of the state of the cleaning tub 33 and a knock by the user. In this case, the knocks detected by the control unit 44 may be combined with detection of the strength of the knocks as well as the number of times. This is effective in increasing the types of controls that the control unit 44 controls, and realizing a variety of controls.

In addition, it is preferable that the combination of detection and control operation of the acceleration sensor 45, and the stop position of the washing tub 33, etc., can be set by the user via the operation unit 46, etc. In this case, it is even more preferable that the above-mentioned setting state, etc. can be confirmed on the display unit. Specifically, at least, this includes setting thresholds related to settings that the user can handle, including the sensitivity of the sensor to vibrations applied to the door body 40, or setting the operation of the drive motor 52, etc. Then, it is preferable that the user can confirm the set setting value via the display unit provided on the operation unit 46. This allows the user to freely set the number of knocks, the detection level of the knock strength, etc., and easily confirm the setting contents. As a result, the usability of the dishwasher is further improved.

Below, an example of the control configuration executed by the control unit 44 based on the combination of the state of the cleaning tank 33 and the number of knocks described above will be described in items (a) to (e).

(a) When the cleaning operation is stopped and the cleaning tank 33 is stored and the user knocks on the door 40 twice, the control unit 44 performs control as follows. In this case, the control unit 44 drives the drive motor 52 to move the cleaning tank 33 forward. (Preparation for operation)
(b) When the user knocks on the door 40 once while the cleaning tub 33 is pulled out and the cleaning operation is not set, the control unit 44 performs control as follows. In this case, the control unit 44 only drives the drive motor 52 to store the cleaning tub 33, but does not start the cleaning operation. (Preparation for operation or end of operation)
(c) When the user knocks twice on the door 40 with the cleaning tub 33 pulled out and the cleaning operation set, the control unit 44 performs the following control. In this case, the control unit 44 only drives the drive motor 52 to store the cleaning tub 33, but does not start the cleaning operation. (Preparation for operation)
(d) When the user knocks on the door 40 once with the cleaning tub 33 pulled out and the cleaning operation set, the control unit 44 performs control as follows: In this case, the control unit 44 drives the drive motor 52 to retract the cleaning tub 33 and start the set cleaning operation. (Start of operation)
(e) During the cleaning operation, if the user knocks on the door 40 three times while the cleaning tub 33 is stored, the control unit 44 performs control as follows. In this case, the control unit 44 temporarily stops the cleaning operation and drives the drive motor 52 to move the cleaning tub 33 forward. (Temporary Stop of Operation)
That is, in cases where the washing tub 33 is simply stored and the washing operation does not start as in (b) and (c), the user stops the washing preparation in the middle of storing the dishes 36. This allows the user to leave the dishwasher. Also, in cases where the user judges that the washing operation is to start as in (d) as in (b), the user can be made aware that the setting for the washing operation has not yet been executed.

In the above embodiment, the various controls are assigned by different numbers of knocks, but the present invention is not limited to this. For example, a start switch or the like may be used as necessary to configure all control operations to be handled by the same number of knocks. In this case, the user does not need to remember the number of knocks for each control operation. This improves the ease of use, such as the user's operability.

In addition, in the above embodiment, if the door body 40 is provided with a handle 43, a configuration may be set in which the user does not use the drive unit 51. Specifically, the control unit 44 may be configured to cancel the drive of the drive motor 52. This provides more options, such as a substitute for a child lock or not using the drive unit in a narrow space.

The operation and effects of the dishwasher configured as above are explained below.

The dishwasher of this embodiment is equipped with at least an acceleration sensor 45 that detects vibrations applied to the door body 40. The control unit 44 drives the drive motor 52 for a set time within the specified time T1, which is the maximum value, to move the washing tub 33 forward and pull it out from the housing 31. This allows the washing tub 33 to be automatically pulled out to a specified position even if the door body 40 of the dishwasher does not have an operating unit 46 or a handle 43. In addition, since the door body 40 does not have an operating unit 46 or a handle 43, the design of the dishwasher can be easily adapted to the diverse designs of system kitchens K. Furthermore, the set time can be adjusted according to the actual usage of the user. This allows the control unit 44 to control the washing tub 33 to stop at any position.

The control unit 44 of the dishwasher of this embodiment is also configured to drive the drive motor 52 when it receives a signal from the acceleration sensor 45 that detects a predetermined vibration applied to the door body 40. This allows the control unit 44 to detect the vibration caused by the user knocking on the door body 40 and move the washing tub 33 in any direction. Specifically, the control unit 44 can drive the drive motor 52 to appropriately move the washing tub 33 forward or backward depending on the timing of the washing operation and the state of the washing tub 33.

The control unit 44 of the dishwasher of this embodiment also drives the drive motor 52 to automatically control the top opening 35 of the washing tub 33 to a position where it is substantially fully open. This eliminates the need for the user to manually pull out the washing tub 33. This allows the user to easily put in and take out dishes 36 without imposing excessive effort or other burden on the user.

Furthermore, the control unit 44 of the dishwasher of this embodiment controls the drive motor 52 to stop when it receives a signal from the acceleration sensor 45 that detects the acceleration generated when the washing tub 33 is stopped. This prevents malfunctions caused by the obstacle even if the door body 40 or the washing tub 33 collides with an obstacle and stops. In this case, as will be described later with reference to Figure 10, a locking portion may be provided at a predetermined position on the drawer. This allows the control unit 44 to reliably stop the washing tub 33 at the predetermined position.

In addition, the control unit 44 of the dishwasher of this embodiment controls the drive motor 52 to be disconnected from the motor circuit when the washing tub 33 is stopped. This allows the user to manually move the washing tub 33. At this time, the movement of the washing tub 33 causes the drive motor 52 to rotate freely, generating a back electromotive force. However, the drive motor 52 is disconnected from the motor circuit. Therefore, the generated back electromotive force does not cause an abnormal current to flow in the printed circuit board of the control unit 44. Furthermore, when the user manually opens or closes the dishwasher, no electrical load is generated due to the back electromotive force of the drive motor 52, so no extra load is placed on the user during the opening or closing operation. Therefore, the user can easily insert and remove the washing tub 33 manually with little effort.

The dishwasher drive unit 51 of this embodiment has a drive motor 52, a pinion gear 53 driven by the drive motor 52, and a rack gear 54 that meshes with the pinion gear 53. The drive motor 52 is fixed to the inside of the housing 31 so that the pinion gear 53 is located near the front opening 32. The rack gear 54 is fixed to the outside of the washing tub 33. When the washing tub 33 moves forward, it is tilted forward. In this case, the vicinity of the pinion gear 53 provided at the front becomes the fulcrum. Therefore, the meshing between the rack gear 54 and the pinion gear 53 is unlikely to come off. However, if a new configuration is provided separately to reliably prevent the meshing from coming off, it can be realized with a mechanism of simple configuration.

As disclosed above, the control unit 44 of the dishwasher of this embodiment controls the drive device 51 to safely move the washing tub 33 in accordance with the user's wishes. This reduces the effort required of the user to manually move the washing tub 33, improving usability. In addition, the operation unit 46 is entirely concealed within the housing 31. This allows the design of the dishwasher to be easily adapted to the ever-diversifying designs of system kitchens K. As a result, the design of the system kitchen K is unified, further improving design.

In addition, if the washing tub 33 comes into contact with an obstacle in front of it, the control unit 44 detects the vibration or change in acceleration caused by the contact. The control unit 44 then immediately stops driving the drive motor 52. This makes it possible to prevent the occurrence of an obstacle and a major malfunction in the dishwasher. As a result, the dishwasher can maintain a high level of safety.

(Embodiment 2)
Second Embodiment A dishwasher according to a second embodiment of the present invention will now be described with reference to FIGS.

3 and 4 are side cross-sectional views of a dishwasher with a pull-out washing tub in accordance with a second embodiment of the present invention. Fig. 3 shows the washing tub stored in the housing. Fig. 4 shows the washing tub pulled out until the top opening is fully open from inside the housing.

The dishwasher of this embodiment differs from the drive unit of the first embodiment in the configuration of the drive unit. Other configurations are the same as those of the first embodiment, so the first embodiment will be used and the description will be omitted.

In other words, as shown in Figures 3 and 4, the drive device 55 in this embodiment is configured with a roller pressure contact type, allowing the cleaning tank 33 to be inserted and removed.

The drive device 55 includes a drive motor 56, a roller 57 driven by the drive motor 56, and a pressure rail 58 against which the roller 57 is pressed. The pressure rail 58 is fixed to the lower part of one of the outer left and right sides of the cleaning tank 33. The pressure rail 58 has a length at least equal to or greater than the stroke by which the cleaning tank 33 is pulled out. The roller 57 is attached to a motor shaft driven by the drive motor 56 and is pressed against the pressure rail 58. The drive motor 56 includes a reduction mechanism (not shown). The drive motor 56 is fixed inside the housing 31 at a position where the roller 57 is near the front opening 32.

Note that, although the roller 57 shown in FIG. 3 is configured to be pressed against the pressure rail 58 from below, this is not limited to the configuration. For example, the roller 57 may be configured to be pressed against the pressure rail 58 from above, or from the side. Also, instead of being configured to be a separate pressure rail 58 as described above, the side or bottom surface of the cleaning tank 33 itself may be used as the pressure rail 58.

The above-mentioned configuration of rollers 57 and pressure rails 58 converts the rotational motion of the drive motor 56 into linear motion. This causes the cleaning tank 33 to move linearly to a position where the top opening 35 is substantially fully open.

In this case, as in the first embodiment, if the drive motor 56 is configured to drive for a set time, the cleaning tank 33 can be stopped at any pull-out position according to the set time.

In addition, when the configuration is a combination of rollers 57 and pressure-welded rails 58, it can be assembled without having to consider gear meshing, as in the rack-and-pinion type of embodiment 1.

Furthermore, the drive device 55 allows the cleaning tank 33 to be pulled out automatically. Therefore, for example, when pulling out the cleaning tank 33, the user does not need to exert excessive effort on the cleaning tank 33.

In other words, the dishwasher of this embodiment can automatically pull out the washing tub 33 by the drive device 55 to a position where the dishes 36 can be easily stored. This improves the ease of use of the dishwasher. Also, the dishwasher of this embodiment can be easily adapted to the ever-diversifying designs of system kitchens K.

(Embodiment 3)
Third Embodiment Hereinafter, a dishwasher according to a third embodiment of the present invention will be described with reference to FIG.

Figure 5 shows a side cross-sectional view of a dishwasher according to embodiment 3 of the present invention.

The dishwasher of this embodiment differs from that of embodiment 1 in that a second operating part is provided on the door body. Other configurations are the same as those of embodiment 1, so that embodiment 1 is used and description thereof is omitted.

That is, as shown in FIG. 5, the door body 40 of this embodiment has a second operating part 46b on the upper part of the decorative panel 42. The second operating part 46b is provided with an operation switch (not shown) for the drive motor 52, which is the drive part that moves at least the cleaning tank 33, or a sensor, etc. The operation switch is composed of, for example, multiple button switches, etc., so that it is possible to distinguish whether the cleaning tank 33 is to be moved forward or backward.

The sensor is composed of a non-contact sensor such as an ultrasonic sensor, an infrared sensor, an optical sensor, or a sound (voice) recognition sensor. Specifically, the ultrasonic sensor, the infrared sensor, and the optical sensor are equipped with a transmitter and a receiver, and output a detection signal to the control unit 44 when a hand or the like is held within a predetermined distance. On the other hand, the sound (voice) recognition sensor recognizes sounds such as clapping, the sound of hitting something, or voice, and outputs the detected content to the control unit 44. Based on the output detection signal and detected content, the control unit 44 determines the operation content, drives the drive motor 52, and moves the cleaning tank 33. The infrared sensor may be configured to detect infrared rays emitted from the human body.

In this case, similar to the control using the acceleration sensor 45 described in the first embodiment, it is preferable to determine the control method (operation direction, etc.) for the cleaning tank 33 based on the number of times a hand is held over the tank within a predetermined time period or the number of times a sound is heard. In the case of a voice recognition sensor, the control method for the cleaning tank 33 is determined based on the content of voice instructions.

In this embodiment, when the cleaning tank 33 is moved forward, the control unit 44 controls the drive motor 52 so that the top opening 35 is substantially fully open. Note that substantially fully open has the same meaning as described in the first embodiment.

The control unit 44 also controls the drive motor 52 in terms of time, as in the first embodiment. In other words, the control unit 44 drives the drive motor 52 for a set predetermined time T1 and then stops it.

With this configuration, the user can automatically pull out or store the cleaning tank 33. Therefore, no effort is required from the user when pulling out or storing the cleaning tank.

In other words, the dishwasher of this embodiment can automatically pull out the washing tub 33 by the drive device 55 to a position where the dishes 36 can be easily stored. This improves the ease of use of the dishwasher.

In addition, the dishwasher of this embodiment can be easily adapted to the diverse designs of system kitchens K.

(Embodiment 4)
Fourth Embodiment Hereinafter, a dishwasher according to a fourth embodiment of the present invention will be described with reference to Figs.

Figure 6 is a perspective view of another drawer-type dishwasher according to embodiment 4 of the present invention. Figure 7 is a front longitudinal cross-sectional view of the same dishwasher. Figure 8 is an enlarged view of the main part of the slide rail portion of Figure 7.

The dishwasher of this embodiment differs from the first embodiment in the configuration of the washing tank of the dishwasher and the configuration of the support mechanism of the door body. That is, the washing tank of the first embodiment is configured to be pulled out and put in from the housing. On the other hand, the washing tank of this embodiment is configured as a washing space surrounded by the inside of the housing and the inner surface of the door body. Therefore, the washing space of the washing tank is configured to be fixed within the housing. Due to this difference, in the first embodiment, the support mechanism for supporting the door body includes the washing tank to which the door body is attached and a slide rail for moving the washing tank. On the other hand, the support mechanism of this embodiment includes a support member to which the door body is attached and a slide rail. Since the other configurations are the same as those of the first embodiment, the first embodiment is used and the description is omitted.

As shown in Figures 6 and 7, the dishwasher of this embodiment includes a housing 71, a washing tank 73, a door body 74, a washing space 75, a drive unit 83, etc.

The housing 71 has a front opening 72 that is open across the entire front. The washing tank 73 is formed inside the housing 71 with the front opening 72. The door body 74 is arranged to cover the front opening 72. The washing space 75 is formed by the washing tank 73 and the door body 74. A lower dish basket 77 and an upper dish basket 78, on which dishes 76 are placed, are arranged in the washing space 75 in a state that allows them to move back and forth. When the lower dish basket 77 and the upper dish basket 78 are engaged with the door body 74, they move back and forth together with the door body 74. On the other hand, when they are released from the engagement, the lower dish basket 77 and the upper dish basket 78 move individually relative to the door body 74. In other words, the lower dish basket 77 and the upper dish basket 78 have a form in which they move integrally with the door body 74 and a form in which they move individually.

The door body 74 has an operating unit 79 on the upper surface 74a. The operating unit 79 allows the user to operate buttons to turn the power on and off, start, pause, and switch between cleaning and drying courses. In this case, the operating unit 79 may be provided with a switch that operates a control unit (not shown) to move the door body 74. The control unit is provided below the operating unit 79.

The door body 74 is supported on the housing 71 via the support mechanism 80 in a state in which it can move back and forth. As described above, the support mechanism 80 includes the support member 81 and the slide rail 82. The slide rail 82 is attached to the inside surface of the housing 71 on both the left and right sides at the lower outside of the cleaning tank 73.

As shown in FIG. 8, the slide rail 82 includes a fixed rail 82a, a first movable rail 82b, and a second movable rail 82c. The first movable rail 82b is slidably attached to the fixed rail 82a. The second movable rail 82c is slidably attached to the first movable rail 82b.

The support member 81 is formed of a metal plate such as stainless steel, and the front end 81a is fixed to the inside lower part of the door body 74. The support member 81 is fixed on the second movable rail 82c of the slide rail 82.

When the door body 74 moves forward, the support member 81 and the second movable rail 82c move forward together with the first movable rail 82b while supporting the door body 74 substantially vertically (including vertically). This causes the slide rail 82 to extend.

The drive device 83 has at least a drive motor 84 that constitutes a drive unit, and is disposed below the cleaning tank 73 inside the housing 71. The drive device 83 moves the door body 74 at least in the forward or backward direction.

The control unit receives a predetermined signal from a sensor such as the acceleration sensor 45, an operation switch, etc. Based on the received signal, the control unit drives the drive motor 84, which is a drive unit.

The dishwasher of this embodiment is configured as described above.

The drive device 83 of this embodiment is described below.

The drive unit 83 is configured with a rack and pinion mechanism, as in embodiment 1.

The drive device 83 includes a drive motor 84, a pinion gear 85 driven by the drive motor 84, and a rack gear 86 that meshes with the pinion gear 85.

The rack gear 54 is formed by arranging gear teeth in a straight line. The rack gear 86 is fixed near the support member 81. The rack gear 86 has a length at least equal to or greater than the stroke of movement of the door body 74. The pinion gear 85 is attached to a motor shaft driven by the drive motor 84. The drive motor 84 is equipped with a reduction mechanism (not shown). The drive motor 84 is fixed inside the housing 71 with the pinion gear 85 at a position near the front opening 72.

The above-mentioned rack gear 86 and pinion gear 85 configuration converts the rotational motion of the drive motor 84 into linear motion. This causes the door body 74 to move forward or backward. Other detailed control is the same as in embodiment 1, so a description is omitted.

In this embodiment, the washing tank is constructed separately and the ancillary devices do not move, so the moving part is composed of the door, dish basket, washing nozzle, etc. This allows the moving part to be constructed light. This also allows the drive unit to be constructed relatively small.

(Other embodiments)
The configurations of the four embodiments have been disclosed above.

Below, we will explain other embodiments of various configurations, including the drive unit.

First, an example of another embodiment of a method for stopping the cleaning tank 33 at a predetermined position when it is pulled out will be described with reference to Figures 9 and 10.

In other words, in the first embodiment, a method of controlling the drive motor 52 by time is disclosed as an example, but this is not limited to this. For example, the drive motor may be controlled to stop the cleaning tank 33 by the methods described in 1. to 3. below.

1. As shown in FIG. 9, a position detector 59, for example a microswitch, is provided near the front opening 32 of the housing 31. The position detector 59 detects a predetermined position of the cleaning tank 33 and outputs a detected signal to the control unit 44. The control unit 44 may be configured to control the drive motor to stop driving based on the signal detected by the position detector 59 while the cleaning tank 33 is moving. The position detector 59 may be a photoelectric switch. The photoelectric sensor measures the movement distance of the cleaning tank 33 and detects the position of the cleaning tank 33. The drive unit may also be configured with a stepping motor. In this case, the movement distance of the cleaning tank 33 can be detected based on the number of pulses that drive the stepping motor.

2. As shown in FIG. 10, for example, a locking portion 60 consisting of a first protrusion 60a and a second protrusion 60b is provided. The locking portion 60 may be configured to stop the cleaning tank 33 at a predetermined position. The first protrusion 60a of the locking portion 60 is provided, for example, near the front opening 32 of the housing 31. The second protrusion 60b is provided at the rear of the slide rail 34 or the cleaning tank 33. The first protrusion 60a and the second protrusion 60b are arranged so as to abut at a predetermined position where the cleaning tank 33 is pulled out. As a result, the cleaning tank 33 stops at a predetermined position. At this time, the control unit 44 detects the lock current of the drive motors 52 and 56 that is generated when the cleaning tank 33 is stopped by the locking portion 60. As a result, the control unit 44 may be configured to stop driving the drive motors 52 and 56.

3. As shown in FIG. 10, for example, a locking portion 60 consisting of a first protrusion 60a and a second protrusion 60b is provided. The locking portion 60 may be configured to stop the cleaning tank 33 at a predetermined position. The first protrusion 60a of the locking portion 60 is provided, for example, near the front opening 32 of the housing 31. The second protrusion 60b is provided at the rear of the slide rail 34 or the cleaning tank 33. The first protrusion 60a and the second protrusion 60b are configured to abut at a predetermined position where the cleaning tank 33 is pulled out. As a result, the cleaning tank 33 stops at the predetermined position. At this time, the acceleration sensor 45 detects the acceleration generated when the cleaning tank 33 is stopped by the locking portion 60, and outputs the detected signal to the control unit 44. As a result, the control unit 44 may be configured to stop the drive motors 52 and 56 based on the signal from the acceleration sensor 45.

The configuration described in 1. to 3. above makes it possible to physically set the stop position without needing to determine the relationship between the set time shown in the first embodiment and the amount of the cleaning tank 33 pulled out.

In other words, if the position detection unit 59 (1) or the first protrusion 60a (2) and (3) can be slid back and forth and fixed at any position, the cleaning tank 33 can be stopped reliably at any position.

In the case of the configuration of 2, the drive motors 52, 56 are stopped based on the detection of a lock current in the drive motors 52, 56 that occurs when the cleaning tank 33 stops. This may cause an excessive load to be placed on the drive motors 52, 56 due to the lock current. However, since the current is immediately cut off when it exceeds a predetermined current value, the time during which the lock current flows through the drive motors 52, 56 is short. Therefore, no excessive load is placed on the drive motors 52, 56, and the drive motors 52, 56 can be stopped.

In the case of configurations 2. and 3., it is preferable that the locking portion 60 is made of a material having cushioning properties. This absorbs the shock when the first protrusion 60a and the second protrusion 60b constituting the locking portion 60 come into contact with each other. This allows the washing tank 33 to stop smoothly, and the transmission of shock to the contained tableware 36 is mitigated. As a result, noise caused by the tableware 36 coming into contact with each other and damage to the tableware 36 are prevented. In addition, splashing of water stored in the washing tank 33 due to contact can be prevented. This prevents water from splashing out of the washing tank 33 and preventing the tableware 36 from getting wet after drying after washing.

In addition, in the above-mentioned first and second embodiments, the drive motors 52, 56 of the drive devices 51, 55 are fixed near the front opening 32 of the housing 31, and the rack gear 54 and the pressure rail 58 are fixed to the outside of the cleaning tank 33, but this is not limited to the configuration. For example, the drive motors 52, 56 of the drive devices 51, 55 may be fixed to the rear of the cleaning tank 33, and the rack gear 54 and the pressure rail 58 may be fixed to the inside of the housing 31.

In general, when installing a drive unit in a furniture or refrigerator drawer, it is preferable from a configuration standpoint to install the power source for the drive unit on the housing side.

However, in the dishwasher of the present embodiment with a pull-out type washing tub 33, a power source is required for heater 49 and washing pump 50 arranged in washing tub 33, and therefore a power line is arranged on the washing tub 33 side. Therefore, with the above configuration, the signal lines and power lines from control unit 44 to drive motors 52, 56 can be arranged only on the side of washing tub 33 without being routed to the housing 31 side. This makes it easier to design and assemble the dishwasher and improves workability during maintenance.

In addition, in the above embodiment 1, a configuration in which teeth are provided below the rack gear 54 of the drive device 51 has been described as an example, but this is not limited to this. For example, teeth may be formed on both the top and bottom of the rack gear 54 of the drive device 51, and the rack gear 54 may be sandwiched between two pinion gears 53 from above and below. Also, teeth may be formed on either the top or bottom of the rack gear 54, and a roller may be provided on the side without teeth to sandwich the rack gear 54 from above and below. This allows for a configuration in which the rack gear 54 and the pinion gear 53 mesh reliably and do not easily come apart.

In addition, in each of the above-mentioned embodiments 1, 2, and 4, when the cleaning tank 33 stops midway due to contact with an obstacle, the user continues to move the cleaning tank 33 manually, but this is not limited to the above. For example, the driving devices 51 and 55 may be driven to automatically move the cleaning tank 33. In this case, it is necessary to distinguish whether the cleaning tank 33 is to be pulled out or put away from the stop position. Therefore, as a method of distinguishing the direction of movement, the acceleration sensor 45 may detect the number of times the user taps the decorative panel 42, and distinguish the direction of movement. In addition, a switch indicating the direction of movement may be provided in the operating unit 46, and the direction of movement of the cleaning tank 33 may be distinguished by the user's operation. With this configuration, the driving devices 51 and 55 can be effectively used. This reduces the effort required for the user to manually move the cleaning tank 33.

Next, we will explain other embodiments of the control method for the drive units 51 and 55.

In the above embodiments, the control unit 44 immediately drives the drive motors 52 and 56 when it detects a signal from the user to drive the drive motors 52 and 56, but this is not limited to the above. For example, the control unit 44 may control the drive motors 52 and 56 to start driving a predetermined time T2 (e.g., 0.4 to 1 second) after detecting a signal from the user to drive the drive motors 52 and 56. According to this control, when cleaning water is being sprayed from the cleaning nozzle in the washing step, the drive motors 52 and 56 can be driven after waiting for the cleaning pump to stop. This makes it possible to prevent the cleaning water sprayed from the cleaning nozzle from splashing out of the cleaning tank. In addition, when the control unit 44 continuously detects a signal to drive and repeatedly drives the drive motors 52 and 56, the predetermined time T2 can be set to ensure time to temporarily stop the drive motors 52 and 56. This makes it possible to control the large starting current flowing through the drive motors 52 and 56 so that it does not flow continuously. As a result, excessive temperature rise in the drive motors 52 and 56 due to a large continuous starting current can be prevented.

At this time, it is even more preferable to provide an alarm unit that notifies the movement of the door body 40 by driving the drive motors 52, 56, as this improves safety. In this case, it is preferable to have a configuration in which the alarm starts before the door body 40 starts moving during the above-mentioned specified time T2. This makes it possible to prevent the door body 40 from coming into contact with obstacles such as people due to its movement. As a result, the safety of the dishwasher is further improved.

In each of the above-described embodiments, a door closing detection sensor for detecting the closing of the door body 40 may be further provided. In this case, the door closing detection sensor can be substituted with, for example, a position detection unit 59 shown in FIG. 9. In this case, the control unit 44 controls so as not to detect a signal from the acceleration sensor 45 for a predetermined time T3 (e.g., 0.5 seconds) after detecting a closing signal of the door body 40 by the door closing detection sensor. Alternatively, it is preferable that the control unit 44 controls so as to suspend the driving of the drive motor even if it detects a signal from the acceleration sensor 45.

Normally, when the door 40 is closed, the impact between the door 40 and the housing 31 causes the entire housing 31, including the tableware 36, to vibrate. Therefore, there is a risk that the acceleration sensor 45 will mistakenly detect the vibration as an operation signal due to a knock.

However, by setting a predetermined time T3 so that the vibration is not detected, it is possible to prevent the vibration caused by the blockage from being mistakenly detected. Also, by setting a predetermined time T3, it is possible to ensure that the drive motors 52 and 56 are temporarily stopped. As a result, it is possible to prevent the temperature of the drive motors 52 and 56 from rising excessively.

At this time, an alarm unit may be provided that issues an alarm when the door closing detection sensor detects a closing signal for the door body 40. This allows the user to be reliably informed that the door body 40 is closed. In addition, an alarm may be issued a predetermined time T3 after the closing signal is detected, to inform the user that a knock to pull out the door body 40 is acceptable. With this configuration, the user can easily confirm that the door body 40 is securely closed, and that the subsequent cleaning operation is running normally.

In addition, in each of the above embodiments, the control unit 44 may perform control to notify the occurrence of the abnormal states described below. Note that an abnormal state is, for example, a case where the drive motors 52, 56 are driven in the rearward direction to close the door body 40, and the control unit 44 detects that the drive motors 52, 56 have stopped, but the control unit 44 does not detect a signal from the door closing detection sensor. This makes the user aware that the door body 40 is not completely closed, and urges the user to take prompt action.

In addition, even if the user operates the door 40 to close in response to the above-mentioned abnormal state notification, if the notification is repeated a predetermined number of times (e.g., five times), the abnormality notification may be issued and the drive motors 52, 56 may be controlled to stop further driving. With this configuration, the lock current of the drive motors 52, 56 can be controlled not to flow repeatedly. As a result, excessive temperature rise of the drive motors 52, 56 can be prevented.

Furthermore, the above-mentioned abnormal state notification can inform the user that it is necessary to determine the cause of the abnormality. Examples of causes of the abnormality include whether the door body 40 cannot be closed due to an obstacle, or whether the drive motors 52, 56 or the door close detection sensor have failed. This allows the user to determine the cause of the abnormality and take immediate action. As a result, it is possible to more reliably prevent the cleaning operation from being performed when the door body 40 is not closed.

In each of the above embodiments, the control unit 44 may be controlled to notify the occurrence of an abnormality as described below. The occurrence of an abnormality is, for example, first detecting a signal from a door close detection sensor indicating that the door body 40 is closed. Then, in the detected state, the drive motors 52, 56 are driven in the forward direction to open the door body 40. After driving, the control unit 44 may continue to detect a signal from the door close detection sensor for a predetermined time T4 (e.g., 2.5 seconds). With this configuration, the control unit 44 can determine that the door body 40 is not moving and quickly notify the user of an abnormality in the door body 40.

Furthermore, in each of the above embodiments, the control unit 44 may control the driving of the drive motors 52, 56 to stop further driving when the following abnormality occurrence notification is repeated. Specifically, this is the case when the user knocks but the door body 40 does not open and a notification is issued to the user, and the notification is then repeated a predetermined number of times (e.g., five times). This control can prevent the lock current of the drive motors 52, 56 from repeatedly flowing. This can prevent the temperature of the drive motors 52, 56 from rising excessively.

Furthermore, the above notification can inform the user that it is necessary to determine the cause of the abnormality. Examples of causes of the abnormality include whether the door body 40 is stuck due to an obstacle, or whether the drive motors 52, 56 or the door close detection sensor have broken down.

Next, we will explain other embodiments in which the acceleration sensor 45 is used for control.

In each of the above embodiments, the operation of the washing tub 33 of the dishwasher is controlled based on the signal detected by the acceleration sensor 45, but the present invention is not limited to this. The acceleration sensor 45 may be used, for example, as a level used to detect the inclination of the dishwasher when it is installed.

Dishwashers use water, so if they are installed at an angle, there is a risk of problems such as water leaks. Therefore, it is necessary to check that the dishwasher is level when installing it.

Therefore, the control unit 44 uses the acceleration sensor 45 as a spirit level to detect the deviation between gravity and the acceleration in the Z-axis direction. This eliminates the need to provide a separate spirit level to detect the inclination of the dishwasher. As a result, the workability of installing the dishwasher is improved.

In addition, if the surface on which the dishwasher is installed becomes tilted due to aging, the control unit 44 detects the tilt using the acceleration sensor 45. The control unit 44 then notifies the user that the surface on which the dishwasher is installed has become tilted. Furthermore, the control unit 44 controls the dishwasher to stop operating. This allows the user to use the dishwasher for a long period of time without any malfunctions while adjusting the tilt of the surface on which the dishwasher is installed.

The control unit 44 may also determine the inclination of the installation surface detected by the acceleration sensor 45 and control the drive motors 52, 56 to change the movement speed of the door body 40. Specifically, if the installation surface is inclined forward or backward by less than a predetermined value (e.g., 0.5 degrees or more and less than 2 degrees), the movement speed of the door body 40 is controlled to be slightly slower than normal.

On the other hand, if the installation surface is significantly inclined (for example, between 1 degree and 2 degrees), there is a risk of water leakage or the drive unit 51 being subjected to a greater load than expected. In this case, the control unit 44 can notify the user, for example via the notification unit, and urge the user to take action such as repairing the installation surface. This can prevent malfunctions from occurring. In other words, if the dishwasher is installed on an installation surface that is inclined to a degree that does not interfere with the washing operation, the control unit 44 controls the drive motors 52, 56 to slow down the movement speed of the door body 40. This can further improve the safety of the dishwasher.

Furthermore, in each of the above embodiments, the control unit 44 may control the drive motors 52, 56 so that they cannot be driven if the inclination of the installation surface detected by the acceleration sensor 45 is equal to or greater than a predetermined value (e.g., 2 degrees or greater). This control makes it possible to restrict the operation of the dishwasher before a malfunction occurs, such as a water leak or a load greater than expected being placed on the drive device. This improves the safety of the dishwasher.

In each of the above embodiments, the acceleration sensor 45 may be configured to detect vibrations that occur when the washing water collides with the inner wall of the washing tank 33 during the washing operation. According to this configuration, the control unit 44 determines, from the direction and magnitude of the acceleration caused by the vibrations detected by the acceleration sensor 45,
The status inside the washing tank 33, which will be described below, can be easily determined. Specifically, it can be determined whether the washing pump 50 is operating normally or not, and whether the washing nozzles 48 are rotating normally or not. Furthermore, it can be determined which of the multiple washing nozzles 48 is spraying washing water, how many dishes 36 are contained or not, etc. This makes it possible to find operational problems early on, or to improve washing efficiency by applying this to the spraying method of the washing nozzles.

In addition, in each of the above embodiments, the control unit 44 may determine that the drive motors 52, 56 or the acceleration sensor 45, etc., are malfunctioning and may notify the user of the abnormality in the circumstances described below. Specifically, the control unit 44 notifies the user of the abnormality when, for example, a predetermined output is not input from the acceleration sensor 45 when a signal to drive the drive motors 52, 56 is output. This makes it possible to easily notify the user of an abnormality in the drive system and urge the user to take action.

In addition, in each of the above embodiments, the control unit 44 may control the cleaning tub 33 to be pulled out when it detects an abnormality in the acceleration sensor 45, such as an erroneous output. This control can avoid a problem in which the acceleration sensor 45 cannot detect a knock by the user and the cleaning tub 33 cannot be pulled out. Furthermore, the control unit 44 can notify the user of an abnormality in the acceleration sensor 45 via a notification unit or the like.

As described above, the notification unit is provided, for example, in the operation unit 46, and notifies the user of the start of operation of the drive device 51, the occurrence of an abnormality, etc. The notification unit is configured to provide an auditory notification using a synthesized sound such as a voice or a buzzer. This makes it possible to easily inform a user who is near the dishwasher of the operating status of the dishwasher, etc.

Specifically, when the alarm unit issues a sound, it is preferable that the control unit 44 start the alarm a predetermined time T5 after the acceleration sensor 45 detects vibrations caused by a knock or the like.

In this case, the predetermined time T5 is preferably 0.1 to 0.6 seconds. Usually, when a user knocks on the door body 40, the user focuses on the act of knocking. At this time, if the alarm unit generates a sound similar to a knock, if the predetermined time T5 is less than 0.1 seconds, the sound of the knock and the sound of the initial part of the alarm sound will overlap and be heard. Therefore, it is difficult for the user to hear the sound of the alarm unit, making it difficult to make a judgment. On the other hand, if the predetermined time T5 exceeds 0.6 seconds, the user will hear the sound of the alarm unit with a drawn-out impression, which may make it difficult to make an accurate judgment. Therefore, it is preferable that the alarm unit start generating the alarm sound after the predetermined time T5 has elapsed after detecting vibrations due to a knock or the like. This allows the user to accurately hear and judge the alarm sound without being disturbed by the sound of the knock.

The notification unit may also be configured to notify the user of an error code or other error by flashing a lamp such as an LED or by lighting up a combination of multiple lamps.

In addition, the acceleration sensor 45 is not limited, and the washing tub 33 may be configured to be automatically pulled out when an abnormality occurs. The occurrence of an abnormality may be, for example, a water leak, an abnormal water level, or a large amount of detergent foam. Therefore, the abnormality is detected by a detection method corresponding to each abnormal state, and the washing tub 33 is automatically pulled out. This allows the user to visually notice the occurrence of an abnormality. For example, in the case of the dishwashers of the first and second embodiments, where the operation unit 46 is hidden within the housing 31, the configuration of automatically pulling out the washing tub 33 is particularly preferable. This allows the user to easily check the error code or LED display displayed on the pulled-out operation unit 46. In this case, the amount by which the washing tub 33 can be pulled out is not particularly limited as long as the operation unit 46 can be visually confirmed.

In addition, in each of the above embodiments, a configuration may be provided in which, for example, a remote control (not shown) is provided separately to transmit operation signals to the dishwasher. In this case, the control unit 44 receives various operation signals transmitted from the remote control. Then, based on the received operation signals, the control unit 44 controls each part.

For example, when the washing tub 33 is pulled out or stored, the control unit 44 detects a specific signal sent from the remote control. Then, based on the received specific signal, the control unit 44 drives the drive motors 52, 56 to move the washing tub 33. With this configuration, the user can freely operate the dishwasher from a location away from the dishwasher according to the desired washing time. This further improves the convenience of the dishwasher.

The embodiments disclosed above may be combined with each other without any particular limitations, by combining the configurations of the embodiments that can be combined. This will provide the same effects.

As described above, the dishwasher of the present invention comprises a housing having a front opening on the front side, a dish basket that is removably installed in the housing and stores dishes, and a moving unit that includes a door that covers the front opening. The dishwasher further comprises a support mechanism that supports the moving unit on the housing in a state in which the moving unit can move back and forth, a drive device having a drive unit that moves the moving unit at least in the forward or backward direction, and a control unit that controls at least the drive of the drive unit over time. The control unit is configured to drive the drive unit for a predetermined time and then stop it.

With this configuration, even if the door covering the front of the dishwasher does not have an operating part, the drive unit can automatically pull out the movable part to a position where dishes can be stored. This improves the ease of use of the dishwasher. Furthermore, it can be easily adapted to the ever-diversifying designs of system kitchens.

The dishwasher of the present invention may also be configured so that the control unit stops driving the drive unit when it detects that the moving unit has stopped during movement. With this configuration, even if the door covering the front of the dishwasher does not have an operating unit, the drive unit can automatically pull out the moving unit to a position where dishes can be stored. This improves the ease of use of the dishwasher. Furthermore, it can be adapted to the increasingly diverse designs of system kitchens. Furthermore, when the moving unit is stopped at a specified position, the time that the drive unit is locked is shortened. Therefore, excessive load is not applied to the drive unit. Furthermore, even if the moving unit hits an obstacle and stops, it is possible to prevent malfunctions caused by the obstacle.

The dishwasher of the present invention may also be configured so that the control unit monitors the current of the drive unit and detects the stop of the moving unit based on a change in the current. With this configuration, the control unit detects an increase in current that occurs when the moving unit stops due to some kind of load. This allows the control unit to stop the drive unit in a short time.

The dishwasher of the present invention may also be configured to include a sensor that detects acceleration, and the control unit may be configured to monitor the acceleration of the moving part using the sensor and detect the stop of the moving part based on the magnitude or change in the acceleration. With this configuration, the control unit detects the magnitude or change in acceleration when the moving part stops due to some kind of load. This allows the control unit to stop the drive part in a short time.

The dishwasher of the present invention may be configured so that the control unit stops the drive unit when it detects contact with an obstacle or the occurrence of a load while the moving unit is moving. This configuration can prevent malfunctions caused by the obstacle that comes into contact with the moving unit. Also, even if the user intentionally knocks on the door, the control unit can immediately stop the drive unit.

The dishwasher of the present invention may also be configured so that the control unit monitors the current of the drive unit and detects contact with an obstacle or the occurrence of a load while the moving unit is moving based on a change in current. With this configuration, the control unit detects an increase in current when the moving unit comes into contact with an obstacle or a load is generated. This allows the control unit to stop the drive unit in a short time.

The dishwasher of the present invention may also be configured such that the sensor detects vibrations by acceleration, and the control unit monitors the acceleration of the moving unit with the sensor, and detects contact with an obstacle or the occurrence of a load while the moving unit is moving by a change in acceleration. With this configuration, the control unit detects a change in acceleration when the moving unit comes into contact with an obstacle or a load is generated. This allows the control unit to stop the drive unit in a short time.

The dishwasher of the present invention may also be configured such that the drive unit has a drive section, a pinion gear driven by the drive section, and a rack gear that meshes with the pinion gear, the drive section is fixed to the inside of the housing so that the pinion gear is located near the front opening, and the rack gear is fixed to the support mechanism. With this configuration, when the moving section moves forward and is pulled out and in a forward-downward state, the vicinity of the pinion gear provided at the front becomes the fulcrum. This makes it less likely that the meshing between the rack gear and the pinion gear will come off. Therefore, when a separate mechanism that prevents the meshing from coming off is provided, the mechanism can be configured simply.

The dishwasher of the present invention may also be configured such that the drive unit has a drive section, a pinion gear driven by the drive section, and a rack gear that meshes with the pinion gear, with the drive section fixed to the rear of the support mechanism and the rack gear fixed to the inside of the housing. With this configuration, signal lines and power lines from the control section to the drive section can be routed only on the support mechanism side, without having to be routed to the housing side. This simplifies design and assembly, and improves maintenance workability.

The dishwasher of the present invention may also be configured such that the drive unit has a drive section and a roller driven by the drive section, and the outer circumferential surface of the roller is pressed against a pressure rail provided on the support mechanism. With this configuration, even if the door covering the front of the dishwasher does not have an operating section, the drive unit can automatically pull out the movable section to a position where dishes can be stored. This improves the ease of use of the dishwasher. It can also be easily adapted to the ever-diversifying designs of system kitchens. Furthermore, there is no need to worry about gear meshing during assembly, as with the rack and pinion type, making assembly easier.

The dishwasher of the present invention may also be configured so that the drive unit moves the moving part at a speed of 150 mm/sec to 250 mm/sec. With this configuration, even if the door covering the front of the dishwasher does not have an operating unit, the drive unit can automatically pull out the moving part to a position where dishes can be stored. This improves the ease of use of the dishwasher. It can also be easily adapted to the ever-diversifying designs of system kitchens. Furthermore, it is possible to give the user a high level of satisfaction without causing dissatisfaction with the moving part's speed.

The dishwasher of the present invention may also be configured so that the drive unit moves the moving part with kinetic energy of 0.5 J or less. With this configuration, even if the moving part comes into contact with an obstacle such as a person while moving, or if a person's hand or fingers are pinched when storing the dishwasher, the impact can be mitigated. This improves the safety of the dishwasher.

The dishwasher of the present invention may also be configured such that the control unit drives the drive unit with two or more different voltages in a stepped manner. This configuration can reduce shocks applied to the stored dishes when the dishwasher is stopped, etc. This can prevent noise and damage to the dishes caused by the dishes touching each other. In addition, splashing of water stored in the moving washing tub can be suppressed. This can prevent water from splashing out of the washing tub or water getting on the dishes that have been washed and dried.

The dishwasher control unit of the present invention may also be configured to shut off the motor circuit when the drive unit is stopped. With this configuration, when the user manually moves the moving unit, the motor circuit is shut off, preventing the application of abnormal voltage to the control unit's printed circuit board due to back electromotive force generated by the drive unit spinning freely. This reduces the burden on the user when operating manually and realizes a highly reliable dishwasher.

The dishwasher control unit of the present invention may also be configured to drive the drive unit to a position where the dish basket is substantially fully open in the upward direction. With this configuration, the movable unit can be automatically pulled out by the drive unit. This allows the user to easily load and remove dishes without the need for manual effort.

The dishwasher of the present invention may also be configured to include a remote control that transmits an operation signal, and the control unit may be configured to drive the drive unit when it detects a specific operation signal from the remote control. With this configuration, the user can operate the dishwasher from a location away from the dishwasher. This further improves the convenience of the dishwasher.

Even if the dishwasher of the present invention is fitted with a decorative panel without an operating unit or handle to improve design, the washing tub can be easily pulled out and stored, and the washing operation can be performed. Therefore, it is useful as a dishwasher that is built into a system kitchen and where uniformity of design is required.

3, 36 Dishware 4, 47 Dish basket 7, 50 Washing pump 8, 48 Washing nozzle 9 Water supply valve 14 Main body 15, 33 Washing tank 16, 17, 31a, 34 Slide rail 18, 54 Rack gear 19 Drive motor 20 Gear 21, 37 Inner lid 22 Packing 23 Door 24 Handle 31 Housing 32 Front opening 35 Top opening 38 Parallel link mechanism 39 Sealing section 40 Door body 41 Operation panel 42 Decorative panel 43 Handle 44 Control section 45 Acceleration sensor (sensor)
Description of the Reference Signs 46 Operation section 46b Second operation section 49 Heater 51 Drive device 52 Drive motor 53 Pinion gear 55 Drive device 56 Drive motor 57 Roller 58 Pressure rail 59 Position detection section 60 Locking section 60a First protrusion 60b Second protrusion 71 Housing 72 Front opening 73 Washing tank 74 Door body 74a Top surface 75 Washing space 76 Dishware 77 Lower dish basket 78 Upper dish basket 79 Operation section 80 Support mechanism 81 Support member 81a Front end 82 Slide rail 82a Fixed rail 82b, 82c Movable rail 83 Drive device 84 Drive motor 85 Pinion gear 86 Rack gear

Claims (3)

A housing having a front opening on a front surface thereof;
A basket to store dishes,
a moving unit including a door body and a washing tank that cover the front opening, and a drive unit that moves the moving unit forward at least to a position where the tableware can be accommodated ;
A control unit that controls at least the drive unit,
the driving device includes the driving unit, a pinion gear driven by the driving unit, and a rack gear that meshes with the pinion gear and has teeth that face downward and are aligned in a straight line ;
the driving unit is fixed to the inside of the housing such that the pinion gear is located near the front opening,
The rack gear is configured to be fixed to the washing tub and has a length at least greater than the stroke by which the washing tub is pulled out . The dishwasher according to claim 1, wherein the rack gear is fixed to the lower part of one of the outer left and right sides of the washing tank. 3. The dishwasher according to claim 1, wherein the drive mechanism is provided with a clutch mechanism or a slip mechanism.