A tray driving apparatus for a microwave oven and a microwave oven having the same including a speed changing unit for enhancing the cooking quality by periodically changing the rotational speed of the tray to more evenly radiate a microwave to food. The speed changing means includes a driving gear unit having a plurality of driving gears and mounted to the driving shaft; and a driven gear unit having a plurality of driven gears corresponding to respective driving gears of the driving gear unit, and mounted to the driven shaft. The gears of any one of the driving gear unit and the driven gear unit are portion gears which are gears having gear teeth on respective portions of outer peripheries thereof, the gear teeth of the portion gears are alternately disposed to each other one on another. Accordingly, upon a rotation of the driving shaft, each portion gear of any one of the driving gear unit and the driven gear unit are alternately meshed with a corresponding gear of the other one of the driving gear unit and the driven gear unit, to thereby change the rotational speed of the tray.
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0. 21. A microwave process, comprising:
positioning a tray within an interior cooking chamber of a microwave oven;
radiating high frequency energy into said cooking chamber; and
varying rotational speeds of said tray within said cooking chamber while radiating high frequency energy into said cooking chamber by successively meshing different ones of a first plurality of gears comprised of sector gears providing different arcuate sectors of rotation with operationally aligned gears of a second plurality of gears.
0. 25. A microwave oven, comprising:
a body providing an interior cooking chamber;
a high frequency generator radiating high frequency energy into said cooking chamber;
a tray mounted within said cooking chamber; and
a drive unit comprised of a plurality of sector gears aligned to mesh sequentially with a second plurality of gears, with said drive unit operationally engaging said tray and automatically varying rates of rotation of said tray while said tray rotates through successive arcuate sectors of rotation within said cooking chamber.
0. 29. A microwave process, comprising:
positioning a tray to rate around an interior of a cooking chamber in a microwave oven;
radiating high frequency energy into said cooking chamber; and
varying rotational speeds of said tray within said cooking chamber by meshing a plurality of sector gears aligned to mesh sequentially with different corresponding ones of a second plurality of gears to automatically change said rotational speeds periodically while said tray rotates through successive arcuate sectors of rotation within said cooking chamber.
4. A tray driving apparatus of a microwave oven, comprising:
a tray;
a tray shaft fixed to said tray and rotatably mounted on a cooking chamber ;
a plurality of tray gears fixed to said tray shaft;
a driving source mounted on said cooking chamber ;
a driving shaft connected to said driving source; and
first and second driving gears fixed to said driving shaft, and having a tooth toothed portion and a toothless portion, disposed to be meshed with respective tray gears, each tooth toothed portion of said first and second driving gears alternatively meshed with said respective tray gears while said driving shaft rotates by said driving source.
12. A tray driving apparatus of a microwave oven, comprising:
a tray disposed in a cooking chamber;
a tray shaft coupled to said tray and rotatably mounted on a cooking chamber ;
a tray gear unit fixed to said tray shaft, having a first gear tooth toothed portion and a second gear tooth toothed portion;
a driving source mounted on said cooking chamber ;
a driving shaft coupled to said driving source;
a driving gear unit fixed to said driving shaft, having a third gear tooth toothed portion disposed to be meshed with said first gear tooth toothed portion and a fourth gear tooth toothed portion disposed to be meshed with said second gear tooth toothed portion; and
said third gear tooth toothed portion and said fourth gear tooth toothed portion alternatively meshed with the corresponding first gear tooth toothed portion and second gear tooth toothed portion while said driving shaft rotates by said driving source.
0. 24. A microwave process, comprising:
positioning a tray within an interior cooking chamber of a microwave oven;
radiating high frequency energy into said cooking chamber;
a driving shaft;
a driven shaft rotatably connected to said tray;
driving a first drive unit comprising a plurality of driving gears with different corresponding driven gears of a second drive unit operationally aligned to mesh in different gear ratios with different ones of said driving gears, where a first one of said plurality of driving gears and said plurality of driven gears comprise an assembly of sector gears having gear teeth along different respective arcuate portions of outer peripheries thereof; and
alternately meshing said sector gears with corresponding gears of a second one of said plurality of driving gears and said plurality of driven gears to vary said rotational speeds of said tray in dependence upon said ratios.
0. 20. A microwave oven, comprising:
a body having an interior cooking chamber;
a high frequency generator radiating high frequency energy into said cooking chamber;
a tray mounted on a bottom of said cooking chamber;
a driving shaft;
a driven shaft rotatably connected to said tray;
a first drive unit comprising a plurality of driving gears mounted on said driving shaft;
a second drive unit comprising a plurality of driven gears mounted on the driven shaft operationally aligned to mesh in different gear ratios with different ones of said driving gears; and
a first one of said plurality of driving gears and said plurality of driven gears comprising an assembly of sector gears having gear teeth along different respective arcuate portions of outer peripheries thereof alternately meshing with corresponding gears of a second one of said plurality of driving gears and said plurality of driven gears to vary rotational speeds of said tray in dependence upon said ratios.
3. A microwave oven, comprising:
a body in which a cooking chamber is formed;
a high frequency generator for generating and radiating a high frequency into the interior of the cooking chamber;
a tray mounted to be rotated on the bottom of the cooking chamber in order for food to be securely placed;
a driving source for providing a driving force for rotating the tray;
a driving shaft rotated by the driving source;
a driven shaft connected to the tray and rotated together with the tray;
a driving gear unit having a plurality of driving gears and mounted to the driving shaft; and
a driven gear unit having a plurality of driven gears corresponding to the plurality of driving gears, and mounted to the driven shaft;
wherein gears of any one of the driving gear unit and the driven gear unit are portion gears which are gears having gear teeth on respective portions of outer peripheries thereof, so that, upon a rotation of the driving shaft, each portion gear of any one of the driving gear unit and the driven gear unit is alternately meshed with a corresponding gear of the other one of the driving gear unit and the driven gear unit, to thereby change the rotational speed of the tray.
1. A tray driving apparatus of a microwave oven, comprising:
a driving source for rotating a tray disposed in a cooking chamber of said microwave oven;
a driving shaft rotated by the driving source;
a driven shaft connected to the tray and rotated together with the tray; and
speed changing means for changing the rotational speed of the tray by changing the ratio of the rotational speed transmitted from the driving shaft to the driven shaft;
said speed changing means including comprising:
a driving gear unit having a plurality of driving gears, and mounted to on the driving shaft; and
a driven gear unit having a plurality of driven gears corresponding to respective driving gears of the driving, ear gear unit, and mounted to on the driven shaft;
wherein gears of any one of the driving rear gear unit and the driven gear unit are portion gears which are gears having gear teeth on respective portions of outer peripheries thereof, so that, upon a rotation of the driving shaft, each portion gear of any one of the driving gear unit and the driven gear unit are alternately meshed with a corresponding gear of the other one of the driving gear unit and the driven gear unit, to thereby change the rotational speed of the tray.
2. The tray driving apparatus of a microwave oven as claimed in
5. The tray driving apparatus of
6. The tray driving apparatus of
7. The tray driving apparatus of
8. The tray driving apparatus of
9. The tray diving driving apparatus of
10. The tray driving apparatus of
11. The tray driving apparatus of
13. The tray driving apparatus of
14. The tray driving apparatus of
15. The tray driving apparatus of
16. The tray driving apparatus of
17. The tray driving apparatus of
18. The tray driving apparatus of
19. The tray driving apparatus of
0. 22. The microwave process of
0. 23. The microwave process of
assembling a first one of a plurality of driving gears and a plurality of driven gears from a plurality of said sector gears having gear teeth along different respective arcuate sectors of outer peripheries thereof;
aligning said plurality of driving gears with different corresponding ones of said plurality of driven gears in different gear ratios; and
alternately meshing corresponding gears of said first plurality of driving gears and said plurality of driving gears to said vary rotational speeds of said tray in dependence upon said ratios.
0. 26. The oven of
0. 27. The oven of
a driven shaft connected to rotate said tray at said different rates of rotation;
a driving shaft;
a first assembly comprised of a plurality of driven gears mounted on said driven shaft; and
a second assembly comprised of a plurality of driving gears mounted on said driving shaft and operationally aligned to mesh over different ones of said successive arcuate sectors in different gear ratios with different ones of said driven gears.
0. 28. The oven of
a driven shaft connected to rotate said tray at said different rates of rotation;
a driving shaft;
a first assembly comprised of a plurality of driven gears coaxially mounted on said driven shaft;
a second assembly comprised of a plurality of driving gears coaxially mounted on said driving shaft and operationally aligned to mesh in different gear ratios with different ones of said driven gears over different ones of said arcuate sectors; and
one of said first assembly and said second assembly comprising a plurality of sector gears bearing teeth along different peripheral sectors, alternately meshing with corresponding gears of a second one of said first assembly and said second assembly, to vary said rates of rotation of said tray in dependence upon said ratios.
0. 30. A microwave process of
0. 31. The process of
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1. Field of the Invention
The present invention relates to a microwave oven for cooking food placed on a rotating tray by using a microwave, and more particularly, to a tray driving apparatus for a microwave oven and a microwave oven having the same for enhancing the cooking quality by periodically changing the rotational speed of the tray to much more evenly radiate constructed the gears 122 and 124, which are alternately disposed one on another.
The driven gear unit 125 has the first driven gear 126 and the second driven gear 128, respectively, corresponding to the first driving gear 122 and the second driving gear 124 of the driving gears.
If the cooking begins, the driving shaft 114 of the driving source 112 is rotated. The driving force of the driving shaft 114 is transmitted to the driven shaft 116 to rotate the tray 102. At this time, the rotational force of the driving shaft 114 is alternately transmitted to the driven shaft 116 through the first gears 122 and 126 and the second gears 124 and 128 of the driving gear unit 121 and the driven gear unit 125. Accordingly, the rotational speed of the tray 102 rotated by the driven shaft 116 is periodically changed.
That is, in the state that the first driving gear 122 of the driving gear unit 121 is meshed with the first driven gear 126 of the driven gear unit 125, the second driving gear 124 is in a separated state from the second driven gear 128. Accordingly, the driving force of the driving shaft 114 is transmitted to the driven shaft 116 through the first driving gear 122 and the first driven gear 126, and the tray 102 is rotated at a speed corresponding to the ratio of the first gears 122 and 126.
Here, in the state that the first driving gear 122 is meshed with the first driven gear 126, the driving shaft 114 is rotated up to 180 degrees, the driven shaft 116 is rotated up to an angle of α corresponding to the length of a (more precisely the number of gear teeth) which corresponds to one half of the outer periphery of the first driving gear 122 on the outer periphery of the first driven gear 126.
If the driving shaft 114 is rotated up to 180 degrees, the first driving gear 122 is separated from the first driven gear 126, : at the same time, the second driving gear 124 is meshed with the second driven gear 128, so that the driving force of the driving shaft 114 is, as shown in FIG. 4b 4B, transmitted to the driven shaft 116 through the second driving gear 124 and the second driven gear 128, and the tray 102 is rotated at a speed corresponding to the gear tooth ratio of the second gears 124 and 128. Here, The the driving shaft 114 is rotated 180° in the state that the second driving gear 124 is meshed with the second driven gear 128, and the driven shaft 116 is rotated at an angle of β corresponding to the length of b (more precisely the number of gear teeth) corresponding to the length which corresponds to half one-half of the outer periphery of the second driving gear 124 on the outer periphery of the second driven gear 128.
As stated above, while the driving shaft 114 is rotated one time, the driving force of the driving shaft 114 is alternately transmitted to the driven shaft 116 via the first gears 122 and 126 and the second gears 124 and 128 of the driving gear unit 121 and the driven gear unit 125, so that the rotational speed of the tray 102 is periodically changed.
In the meantime, the driving gears and the driven gears of the driving gear unit 121 and the driven gear unit 125 are not defined confined to only two gears, respectively, as in the first embodiment, but can contain three to four or more gears if necessary when designed. If three gears are used for the respective gear units, the rotational speed of the tray 102 is changed in three steps.
Although the gear teeth are formed on each of the driving gears of the driving gear unit 121 on only one portion of the periphery thereof in the first embodiment, the gear teeth may be also formed on two or more portions of the periphery thereof, and in the latter case, the gear teeth of respective driving gears should be alternately meshed to each other without any interruption between them.
Preferably, when the driving shaft 114 is rotated one time, that is, rotated 360°, an angle at which the driven shaft 116 is rotated, that is, α+β or the an integer times of the α+β, equals to 360° or is different from 360°. Therefore, the rotational speed of the tray 102 at a particular position in the cooking chamber in which the tray 102 is rotated is continuously changed. Accordingly, the microwave is microwaves are more evenly radiated to food.
In the meantime,
The tray driving apparatus according to the second embodiment of the present invention includes a driving source 132 for providing a driving force, a driving shaft 134 and a driven shaft 136 for transmitting a driving force of the from driving source 132 to the tray 102′, and a speed changing gear unit for changing the rotational speed of the tray 102′ disposed between the driving shaft 134 and the driven shaft 136. The speed changing gear unit includes a driving gear unit 141 which has a first driving gear 142 and a second driving gear 144, and a driven gear unit 145 which has a first driven gear 146 and a second driven gear 148.
In the second embodiment of the present invention as stated above, as in the first embodiment, the rotational force of the driving shaft 134 is alternately transmitted through the first gears 142 and 146 and the second gears 144 and 148 of the driving gear unit 141 and the driven gear unit 145. However, since the first and second gears 146 and 148 of the driven gear unit 145 have portion gears, respectively, the period of a speed change is exactly 180°. Accordingly, the rotational speed of the tray 102′ at a particular position in the cooking chamber in which the tray,102′ is rotated is the same all the time. Accordingly, it is expected that the efficiency in an even radiation of a microwave with respect to microwaves to the food is lower than that in the first embodiment of the present invention.
Further, in the second embodiment of the present invention as shown in
In the tray driving apparatus of a microwave oven according to the present invention as stated above, since a driving force transmitted from the driving shaft to the driven shaft is periodically changed by the speed changing unit, the rotational speed of the tray is periodically changed. Accordingly, compared to a conventional microwave oven in which the tray is constantly rotated, a microwave is more evenly radiated to food is more evenly radiated with microwaves, so that a cooking quality for food is much more enhanced.
As stated above, a preferred embodiment of the present invention is shown and described. Although the preferred embodiment of the present invention has been described, it is understood that the present invention should not be limited to this preferred embodiment, but various changes and modifications can be made by one skilled in the art within the spirit and scope of the present invention as hereinafter claimed.
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