Ultrasonic Spoon Washing Apparatus and Method

Abstract

Proposed is ultrasonic spoon washing apparatus and method, which use ultrasonic waves generated by one or more ultrasonic oscillators provided on a vertical side wall of polygonal surfaces of a wash tub, so that spoons contained in a spoon support part rotating forward/in reverse may very efficiently and conveniently be washed while the number of revolutions changes for each washing stage, the apparatus including: a frame body; the wash tub mounted inside the frame body; one or more ultrasonic oscillators provided on an outer side of the vertical side wall; a forward/reverse rotation support part including a support shaft and a rotation support pipe; a spoon support part including a holder and a spoon accommodation container; a rinsing water supply part configured to spray the rinsing water together with a rinsing aid; and a wastewater and foreign material discharge part configured to discharge, to the outside, wastewater and foreign materials.

Claims

1. An ultrasonic spoon washing apparatus, the apparatus comprising: a frame body (10); a wash tub (20) which is mounted inside the frame body, of which a vertical side wall (23) of polygonal surfaces extends upward around a bottom surface thereof so that a washing space (21) having a predetermined depth is provided, in which washing water is automatically supplied and blocked through a washing water supply part (26) controlled by means of highest and lowest water level detection sensors (24 and 25), and in which a detergent is also automatically supplied and blocked through a detergent supply part (27); one or more ultrasonic oscillators (30) provided on an outer side of the vertical side wall (23) comprising the polygonal surfaces of the wash tub; a forward/reverse rotation support part (40) mounted vertically in a center of an inside of the wash tub (20) so as to be rotatable forward/in reverse and comprising a support shaft (42) axially installed by passing through to an inside of the wash tub in order to rotate forward/in reverse through power transmitted from a motor (41) and a rotation support pipe (43) installed vertically inside the wash tub in order to rotate forward/in reverse with respect to the support shaft, wherein the rotation support pipe is formed of polygon so as to rotate forward/in reverse together with the spoon support part (50) mounted thereon without rotating idle one another when the spoon support part (50) rotates forward/in reverse; a spoon support part (50) comprising a holder (52) for detachably supporting a fitting pipe (51) so as to be rotatable forward/in reverse with respect to the rotation support pipe (43) of the forward/reverse rotation support part (40) and a spoon accommodation container (53) supported and mounted inside the holder so as to be withdrawable therefrom; a rinsing water supply part (70) configured to spray, after ultrasonic spoon washing using the washing water and washing water draining, the rinsing water, having been heated to a proper temperature (80˜85° C.) in a rinsing tank (71), together with a rinsing aid from above a top of the spoon support part (50) rotating forward/in reverse through at least one nozzle (73) formed in an injection pipe (72) so as to rinse the spoons that have been completely washed; and a wastewater and foreign material discharge part (60) configured to discharge, to the outside, the wastewater and foreign materials generated during a spoon washing and rinsing process, wherein the wastewater and foreign materials discharged in the process of washing and rinsing the spoon, respectively, are collected in one water collecting pipe (80) through the drain pipes connected to the wash tub (20) and the rinsing tank (71) of the rinsing water supply part (70), respectively, including the wastewater and foreign material discharge part (60), and are discharged to the outside through one discharge pipe (81).

2. The apparatus of claim 1, wherein the vertical side wall (23) of polygonal surfaces of the wash tub (20) is made within a range of a hexagonal shape to a dodecagonal shape.

3. The apparatus of claim 1, wherein the forward/reverse rotation support part (40) is configured to rotate forward/in reverse at a medium speed during washing with washing water and detergent, at a low speed during ultrasonic washing, at a medium speed during rinsing, and at a high speed during drying according to a washing step of the spoons placed in the spoon accommodation container (53) of the spoon support part (50) that is supported and mounted thereon.

4. The apparatus of claim 1, wherein the wastewater and foreign material discharge part (60) is installed passing through a bottom part of the wash tub (20) in a state in which one end thereof positioned inside the wash tub protrudes by a predetermined height from a bottom of the wash tub.

5. The apparatus of claim 1, wherein the spoon accommodation container (53) of the spoon support part (50) is divided in a state of being half and configured to be supportedly mounted to be withdrawable with respect to the holder (52), and the spoon accommodation container is partitioned into at least one accommodation space (53a).

6. The apparatus of claim 1, wherein each spoon accommodation container (53) of the spoon support part (50) is individually divided and supportedly mounted to be withdrawable, with respect to the holder (52).

7. The apparatus of claim 1, wherein each spoon accommodation container (53) of the spoon support part (50) is divided individually but integrally fixedly installed, with respect to the holder (52).

8. The apparatus of claim 1, wherein the fitting pipe (51) and the spoon accommodation container(53) of the spoon support part (50) are further provided with a handle (51-1) for detaching manipulation and a handle (53-1) for pulling-out, respectively.

9. The apparatus of claim 1, wherein the holder (52) of the spoon support part (50) is further provided with a safety net (54) on a top side thereof.

10. The apparatus of claim 5, wherein the fitting pipe (51) and the spoon accommodation container (53) of the spoon support part (50) are further provided with a handle (51-1) for detaching manipulation and a handle (53-1) for pulling-out, respectively.

11. The apparatus of claim 6, wherein the fitting pipe (51) and the spoon accommodation container (53) of the spoon support part (50) are further provided with a handle (51-1) for detaching manipulation and a handle (53-1) for pulling-out, respectively.

12. The apparatus of claim 7, wherein the fitting pipe (51) and the spoon accommodation container (53) of the spoon support part (50) are further provided with a handle (51-1) for detaching manipulation and a handle (53-1) for pulling-out, respectively.

13. The apparatus of claim 5, wherein the holder (52) of the spoon support part (50) is further provided with a safety net (54) on a top side thereof.

14. The apparatus of claim 6, wherein the holder (52) of the spoon support part (50) is further provided with a safety net (54) on a top side thereof.

15. The apparatus of claim 7, wherein the holder (52) of the spoon support part (50) is further provided with a safety net (54) on a top side thereof.

16. An ultrasonic spoon washing method, the method comprising: primarily washing the spoons placed in the spoon accommodation container (53) using washing water and detergent, while washing water and an appropriate amount of the detergent are supplied to the wash tub (20) having a vertical side wall (23) made of polygonal surfaces, and at the same time, the spoon support part (50), which is detachably mounted on the rotation support pipe (43) of the forward/reverse rotation support part (40), is rotated forward/in reverse at a medium speed; secondarily washing the spoons using ultrasonic waves, wherein, when the washing water in the wash tub (20) reaches the highest water level, the spoon support part (50), mounted on the rotation support pipe (43) of the forward/reverse rotation support part (40), is rotated forward/in reverse from a medium speed to a low speed and, at the same time, the ultrasonic oscillators (30), mounted on the outside of the vertical sidewall (23) of the wash tub, are operated; discharging the wastewater including the foreign materials in the wash tub (20) to the outside through the wastewater and foreign material discharge part (60) after the primarily and secondarily washing of the spoons is completed; rinsing the spoons accommodated in the spoon accommodation container by rotating the spoon support part (50) forward/in reverse at the medium speed at the same time when draining of the wastewater and foreign materials are completed through the wastewater and foreign material discharge part (60), wherein, at the same time, in a state in which the wastewater and foreign material discharge part (60) is open, the rinsing water, which has been heated to a high temperature (80-85° C.) in the rinsing tank (71) of the rinsing water supply part (70), is sprayed evenly together with the appropriate amount of the rinsing aid from above the top of the spoon support part (50) through at least one nozzle (73) formed in an injection pipe (72); and drying the spoons while rotating the spoon support part (50) forward/in reverse at the high speed again so that the water attached to the spoon accommodated in the spoon accommodation container is removed after the rinsing is completed.

Description

DESCRIPTION OF DRAWINGS

[0030] FIG. 1 is a view showing a front structure according to the present disclosure.

[0031] FIG. 2 is a view showing a top surface structure according to the present disclosure.

[0032] FIG. 3 is a view showing a left side structure with reference to FIG. 1 according to the present disclosure.

[0033] FIG. 4 is a view showing a right side structure with reference to FIG. 1 according to the present disclosure.

[0034] FIG. 5 is an extracted view showing a structure of a forward/reverse rotation support part according to the present disclosure.

[0035] FIG. 6 is an extracted view showing a structure of a rinsing water supply part according to the present disclosure.

[0036] FIG. 7 is an extracted view showing a structure of a rear surface of a wash tub according to the present disclosure.

[0037] FIGS. 8A and 8B are views showing disassembled and assembled states of a spoon support part, respectively, according to an embodiment of the present disclosure.

[0038] FIGS. 9A and 9B are views showing disassembled and assembled states of a spoon support part, respectively, according to another embodiment of the present disclosure.

[0039] FIGS. 10A and 10B are views showing disassembled and assembled states of a spoon support part, respectively, according to still another embodiment of the present disclosure.

[0040] FIG. 11 is a view showing an assembled state of the spoon support part according to still another embodiment according to the present disclosure.

[0041] FIG. 12 is a view showing an assembled state of the spoon support part according to still another embodiment according to the present disclosure

BEST MODE

[0042] Hereinafter, exemplary embodiments according to the present disclosure will be described in more detail with reference to the accompanying drawings.

[0043] With reference to FIGS. 1 to 12, a spoon washing apparatus according to the present disclosure largely includes a frame body 10, a wash tub 20, ultrasonic oscillators 30, a forward/reverse rotation support part 40, a spoon support part 50, a wastewater and foreign material discharge part 60, and a rinsing water supply part 70.

[0044] The frame body 10 is equipped with various devices and may be equipped with a movement prevention device having a function of preventing arbitrary movement or of height adjustment when equipment is completed, including wheels for movement, at a lower portion thereof.

[0045] The wash tub 20 is mounted inside the frame body 10. The wash tub 20 has a vertical side wall 23 of polygonal surfaces extendedly formed upward with a bottom surface 22 as a center so as to provide a washing space 21 having a predetermined depth and has a shape open upward.

[0046] In addition, the wash tub 20 may be covered with a cover 12 that is connected to the frame body 10 and configured to be manipulated to be opened and closed in one direction.

[0047] In the present disclosure, the reason for forming the vertical side wall 23 of the wash tub 20 in polygonal surfaces is not only to facilitate installation of the ultrasonic oscillator by sufficiently taking into account that it is considerably difficult to mount the ultrasonic oscillator 30 on a curved surface when the wash tub 20 is formed in a circular type but also to reduce a volume with respect to the circular-type spoon support part 50 mounted inside the wash tub 20 to a minimum. Accordingly, this enables efficient washing while reducing wasting of washing water.

[0048] To this end, the vertical side wall 23 may be made of a polygonal shape within a range of between a hexagonal shape and a dodecagonal shape. In addition, it may be an octagonal shape as best. The reason is that by configuring the vertical side wall 23 in the octagonal shape, there is a structural advantage in that a volume of the washing space may be minimized by allowing the wall to be close to the spoon support part 50 made of a circular type. In addition, when the vertical side wall is formed to have no greater than a pentagonal shape, there is a problem in that an unnecessary volume in the wash tub 20 is provided compared to the shape of the spoon support part 50, thereby causing waste of washing water.

[0049] In the washing space 21 of the wash tub 20, washing water is automatically supplied and blocked through a washing water supply part 26 configured to be controlled by means of highest and lowest water level detection sensors 24 and 25, and an appropriate amount of detergent is automatically made to be supplied and blocked through the detergent supply part 27. The appropriate amount of detergent supplied through the detergent supply part 27 may be controlled to be supplied and blocked by a timer.

[0050] The washing water supply part 26 and the detergent supply part 27 are disposed on any one surface of the vertical side wall made of polygonal surfaces. At this time, the washing water supply part 26 configured to supply and block the washing water to the washing space 21 may be installed to be disposed above the highest water level detection sensor 24, whereby the washing water is supplied from the uppermost side of the washing space 21.

[0051] The ultrasonic oscillators 30 configured to generate ultrasonic waves are mounted on outer peripheral surfaces of the vertical side wall 23 of the wash tub 20. One or more ultrasonic oscillators may be installed on each surface other than the surface on which the washing water supply part 26 is disposed.

[0052] The ultrasonic oscillators 30 disposed outside the polygonal surfaces of the vertical side wall 23 may be variously installed according to working conditions.

[0053] The ultrasonic oscillators 30 may be installed on the surfaces of the vertical side wall 23 opposite to each other so that the ultrasonic waves are generated in directions facing each other, but not limited thereto, and may be selectively installed as needed.

[0054] In the case of the present disclosure, except for the surface on which the washing water supply part 26 is disposed and the surface corresponding thereto so that ultrasonic spoon washing is performed, at least six ultrasonic oscillators 30 are mounted on each of the remaining surfaces of the vertical side wall 23 (see FIG. 2).

[0055] When mounting the ultrasonic oscillators 30 on the outside of the corresponding surfaces of the vertical side wall 23 made of the polygonal surfaces as described above, respectively, as the ultrasonic waves are generated at various angles, the efficiency of the ultrasonic spoon washing may be remarkably increased as compared to conventional ultrasonic waves that are limitedly generated in only one direction.

[0056] Inside the wash tub 20, a rotation support pipe of the forward/reverse rotation support part 40 is axially installed so as to be rotatable forward/in reverse.

[0057] The forward/reverse rotation support part 40 includes: a support shaft 42 axially installed by passing through to an inside of the wash tub 20 in order to rotate forward/in reverse through power transmitted from a motor 41; and a rotation support pipe 43 installed vertically inside the wash tub in order to rotate forward/in reverse with respect to the support shaft. In this case, the rotation support pipe 43 may be formed in a polygonal shape so as to rotate forward/in reverse together with the spoon support part 50, which is supported and mounted thereon, without rotating idle one another when the spoon support part 50 rotates forward/in reverse.

[0058] According to the present disclosure, the rotation support pipe 43 of the forward/reverse rotation support part 40 is configured to be controlled according to a washing step of the spoons placed in a spoon accommodation container of the spoon support part 50 that is supported and mounted thereon. That is, the rotation support pipe 43 is controlled to rotate forward/in reverse at a medium speed during washing with washing water and detergent, at a low speed during ultrasonic washing, at a medium speed during rinsing, and at a high speed during drying.

[0059] Here, a forward/reverse rotation speed of the rotation support pipe 43 may be set approximately at 20 to 30 times per minute in the case of the medium speed, 5 to 10 times in the case of the low speed, and 50 to 60 times in the case of the high speed.

[0060] Therefore, according to the present disclosure, it becomes possible to make that in a process of first washing the spoons by adding the washing water or detergent, the spoon support part 50 is rotated forward/in reverse at the medium speed for the first washing, for second washing using the ultrasonic waves, the spoon support part 50 is rotated at the low speed to maximize an effect of washing foreign materials by the ultrasonic waves, during rinsing, the spoon support part 50 is rotated forward/in reverse at the medium speed again to perform rinsing, and during drying, the spoon support part 50 is rotated forward/in reverse at the high speed to forcibly remove moisture from the spoons.

[0061] The spoon support part 50 includes: a holder 52 in which a fitting pipe 51 is detachably supported to be rotatable forward/in reverse with respect to the rotation support pipe 43 of the forward/reverse rotation support part 40; and a spoon accommodation container 53 supportedly mounted inside the holder to be withdrawable.

[0062] The holder 52 and the spoon accommodation container 53 of the spoon support part 50 are composed of a structure that allows the foreign materials generated by friction with the washing water or ultrasonic oscillations during the washing and washing process of the spoons to be discharged. In particular, the spoon accommodation container 53 may be formed of a perforated structure, but may also be formed of a mesh-type structure as necessary.

[0063] Therefore, the above-described spoon support part 50 may be implemented in various ways within a range that does not deviate from a use thereof, and the embodiments are as follows.

[0064] The spoon accommodation container 53 of the spoon support part 50 according to the present disclosure is divided in a state of being half and configured to be supportedly mounted with respect to the holder 52, as illustrated in FIGS. 8A and 8B, and FIGS. 9A and 9B, and to be partitioned to have at least one accommodation space 53a at the inside thereof.

[0065] In addition, each spoon accommodation container 53 of the spoon support part 50 according to the present disclosure may be supportedly mounted to be withdrawable individually with respect to the holder 52, as illustrated in FIGS. 10A and 10B, and FIG. 11.

[0066] In addition, according to the present disclosure, each spoon accommodation container 53 of the spoon support part 50 may be configured individually but integrally fixedly installed with respect to the holder 52, as illustrated in FIG. 12.

[0067] On the other hand, according to each embodiment of the present disclosure, the spoon accommodation container 53 of the spoon support part 50 may further be provided with a handle 53-1 for pulling-out.

[0068] By having the handle 53-1 for pulling-out, it is possible to more conveniently perform pulling out manipulation of the spoon accommodation container 53 from the holder 52.

[0069] In addition, according to each embodiment of the present disclosure, the fitting pipe 51 of the spoon support part 50 may further be provided with a handle 51-1 for detaching manipulation.

[0070] By further having the handle 51-1 for detaching manipulation, it will be possible to more conveniently perform detaching manipulation of the holder 52 from the wash tub 20 when the holder 52 is pulled out after the washing operation.

[0071] In addition, according to each embodiment of the present disclosure, the holder (52) of the spoon support part (50) is further provided with a safety net (54) on a top side thereof.

[0072] The safety net 54 may play a role of preventing the spoons from leaving to the outside due to shaking during the forward/reverse washing process when a height of a top end of the spoon accommodation container 53 mounted on the holder 52 is mounted in a relatively low state.

[0073] According to the present disclosure, the wastewater and foreign material discharge part 60 is to discharge the wastewater or the foreign materials in the wash tub 20 to the outside after the first washing operation with washing water and the second washing operation by the ultrasonic oscillations are performed. To this end, the wastewater and foreign material discharge part 60 is installed passing through a bottom part of the wash tub in a state in which one end thereof positioned inside the wash tub protrudes by a predetermined height from a bottom of the wash tub. The wastewater and foreign material discharge part (60) may be installed with at least one for rapid discharge.

[0074] At this time, since the wastewater and foreign material discharge part 60 is disposed in a state in which the one end thereof protrudes from the bottom surface 22 of the wash tub 20 by the predetermined height, the bottom of the wash tub is always filled with a certain amount of water unless the wastewater is finally drained through a drain pipe 28. In particular, such a point serves to induce a smooth rotation operation by preventing the through-assembly part of the forward/reverse rotation support part 40 installed to penetrate inside the washtub 20 from drying out.

[0075] According to the present disclosure, the rinsing water supply part 70 is configured, in a state in which foreign materials or wastewater is discharged through the wastewater and foreign material discharge part 60 after washing by the washing water and ultrasonic waves, to spray rinsing water heated to a proper temperature (80-85° C.) in the inside of a rinsing tank 71 together with a rinsing aid through at least one of nozzles 73 formed in an injection pipe 72 from above the spoon support part 50 rotating forward/in reverse, thereby rinsing the spoons having been completely washed.

[0076] In the drawing, reference numeral 28, which is not described, denotes a drain pipe installed through the bottom of the wash tub 20, and 74 denotes a drain pipe provided in the rinsing tank 71.

[0077] Therefore, the spoons placed in the spoon accommodation container 53 of the spoon support part 50 and completely washed collides with the rinsing water while the spoon support part 50 rotates forward/in reverse, and various foreign substances are removed again, and wastewater or foreign materials generated in the rinsing process are discharged to the outside through the wastewater and foreign material discharge part 60 being in an open state.

[0078] Therefore, in the ultrasonic spoon washing apparatus according to the present disclosure configured as described above, the washing water and detergent are fed into the wash tub 20 through the washing water supply part and the detergent supply part 27, while the forward/reverse rotation support part 40 rotates. The spoon support part 50 mounted on the support pipe 43 rotates forward/in reverse at the medium speed, whereby the spoons accommodated in the spoon accommodation container 53 of the spoon support part are first washed. In addition, when the washing water is filled to the highest water level by means of the highest water level detection sensor 24 in the wash tub, the spoon support part 50 rotates forward/in reverse at the low speed by the forward/reverse rotation support part 40, and at the same time, by generating ultrasonic waves from the ultrasonic oscillators 30 mounted on the outside of the vertical side wall 23 made of polygonal surfaces of the wash tub, the spoons accommodated in the spoon accommodation container 53 of the spoon support part 50 are secondarily washed by the ultrasonic waves.

[0079] Here, ultrasonic oscillators are equipped on the vertical side wall 23 of the wash tub 20 made of polygonal surfaces, so the spoons to be secondarily washed by ultrasonic oscillations may be evenly washed by ultrasonic waves generated from various directions and angles.

[0080] In addition, when the first and second washing by the washing water and ultrasonic waves is completed, the foreign materials or wastewater remaining in the wash tub are discharged to the outside through opening of the wastewater and foreign material discharge part 60, and at the same time, the rinsing water, which is heated to a high temperature (80-85° C.) in the rinsing tank 71 of the rinsing water supply part 70, is sprayed from above the top of the spoon support part 50 together with an appropriate amount of the rinsing aid (rinse). At this time, the spoon support part 50 rotates forward/in reverse at the medium speed to evenly rinse the spoons accommodated in the spoon accommodation container 53.

[0081] When wastewater and foreign materials generated in the rinsing process are also discharged to the outside through the wastewater and foreign materials discharge part 60 being in an open state, and rinsing by the rinsing water is completed, the spoon support part 50 is rotated forward/in reverse at the high speed again by the forward/reverse rotation support part 40, and the water on the spoons is forcibly dried through this operation.

[0082] In addition, when the drying operation of the spoons is completed, the cover 12 is opened from the frame body 10, and then the spoon accommodation container 53 is pulled out from the holder 52 of the spoon support part 50 to use the spoons.

[0083] Therefore, the spoons accommodated in each spoon accommodation container 53 accommodated in the holder 52 of the spoon support part 50 through a series of processes as described above may be automatically washed, and after washing and rinsing are completed, the drain pipes 28 and 74 are opened to wash the inside of the wash tub and the rinsing tank.

[0084] According to the present disclosure, it may be configured such that the wastewater and foreign materials, which are discharged through the drain pipes 28 and 74 connected to the wash tub 20 and the rinsing tank 71, respectively, and the wastewater and foreign material discharge part 60 in the process of washing and rinsing the spoon, may be connected to each other and thus collected in one water collecting pipe 80 so as to be finally discharged to the outside through one discharge pipe 81. By doing so, there is an advantage in that it is possible to more easily and simply manage the discharge of the wastewater and foreign materials.

[0085] Next, an ultrasonic spoon washing method according to the present disclosure is looked at as follows.

[0086] According to the washing method of the present disclosure, the spoons accommodated in the spoons accommodation container 53 of the spoon support part 50 are automatically washed through the followings, the washing method including: primarily washing the spoons placed in the spoon accommodation container (53) using washing water and detergent, while washing water and an appropriate amount of the detergent are supplied to the wash tub (20) having a vertical side wall (23) made of polygonal surfaces, and at the same time, the spoon support part (50), which is detachably mounted on the rotation support pipe (43) of the forward/reverse rotation support part (40), is rotated forward/in reverse at a medium speed;

[0087] secondarily washing the spoons using ultrasonic waves, wherein, when the washing water in the wash tub (20) reaches the highest water level, the spoon support part (50), mounted on the rotation support pipe (43) of the forward/reverse rotation support part (40), is rotated forward/in reverse from a medium speed to a low speed and, at the same time, the ultrasonic oscillators (30), mounted on the outside of the vertical sidewall (23) of the wash tub, are operated;

[0088] discharging the wastewater including the foreign materials in the wash tub (20) to the outside through the wastewater and foreign material discharge part (60) after the primarily and secondarily washing of the spoons is completed;

[0089] rinsing the spoons accommodated in the spoon accommodation container by rotating the spoon support part (50) forward/in reverse at the medium speed at the same time when draining of the wastewater and foreign materials are completed through the wastewater and foreign material discharge part (60), wherein, at the same time, in a state in which the wastewater and foreign material discharge part (60) is open, the rinsing water, which has been heated to a high temperature (80-85° C.) in the rinsing tank (71) of the rinsing water supply part (70), is sprayed evenly together with the appropriate amount of the rinsing aid from above the top of the spoon support part (50) through at least one nozzle (73) formed in an injection pipe (72); and

[0090] drying the spoons while rotating the spoon support part (50) forward/in reverse at the high speed again so that the water attached to the spoon accommodated in the spoon accommodation container (53) is removed after the rinsing is completed.

[0091] In addition, after the washing operation of the spoons is completed, the cover 12 of the frame body is opened, and then the spoon accommodation container 53 of the spoon support part 50 mounted on the rotation support pipe of the forward/reverse rotation support part 40 is pulled out to the outside to use the spoons.

[0092] In the ultrasonic washing method of the spoons, the forward/reverse rotation speed of the forward/reverse rotation support part 40 on which the spoon support part 50 is mounted may be set approximately to 20 to 30 times per minute in the case of the medium speed, to 5 to 10 times per minute in the case of the medium speed, and to 50 to 60 times per minute in the case of the high speed.

[0093] Through the method as described above, the spoons are washed over two times through the washing water and ultrasonic oscillations, and at the same time, a process of rinsing and drying is automatically performed after washing. In such a process, more efficient washing of the spoons may be achieved by varying the forward/reverse rotation speed of the spoon support part.

[0094] Although the present disclosure has been described with reference to the accompanying drawings, the present disclosure is not limited thereto, and it is natural that many modifications and changes may be made without departing from the scope of the following claims.