CN1085818C - Driving device for rotary desk of microwave oven - Google Patents

Abstract

A turntable driving device for a microwave oven, which has a simple structure, fewer parts, and saves manufacturing costs. The life of the cage member supporting the turntable shaft can be extended, the movement of the turntable shaft can be made smooth, noise and vibration can be eliminated, and the turntable can be rotated The electric motor and the electric motor for raising and lowering the turntable are arranged at corresponding positions on the left and right, so that it is easy to improve the assembling operation by the meshing of a plurality of gears, and the overall work efficiency can be improved. The device has a turntable shaft; a turntable rotating device; a turntable lifting device.

Description

Micro-wave oven

technical field

The present invention relates to a microwave oven, and more specifically relates to such a microwave oven, that is, a microwave oven turntable drive device for a microwave oven turntable that rotates and rises and falls to prepare food more uniformly and quickly.

Background technique

Generally speaking, as shown in Figure 1, a microwave oven is formed with a heating chamber 2 (the heating chamber has a space with a specified area) for placing food and heating the food in the case cover 1 forming the appearance of the microwave oven. The stirrer cover 3 is provided with a freely rotatable stirrer blade 5 via a shaft 4 to disperse high-frequency waves and evenly heat the food placed in the heating chamber 2 . A waveguide 6 is provided on the upper side of the stirrer blade 5 to guide the high-frequency wave dispersed by the stirrer blade 5 into the heating chamber 2 .

A magnetron 7 for generating high-frequency waves is provided at one end of the waveguide 6, and the magnetron is powered by a power supply device not shown in the figure. A cooling fan 8 is provided on one side of the above-mentioned case cover 1, and after being energized, it rotates while cooling the heat generated when the magnetron 7 is operated by the fan wind force, and at the same time, the stirring blade 5 is rotated.

On the inside bottom surface of the above-mentioned heating chamber 2, a turntable 9 is arranged, on which a cooking table or a container for storing food can be placed, and on the bottom surface of the outside of the heating chamber 2, a drive device 10 is arranged to drive and make the above-mentioned turntable 9 rotate.

Adopt the existing microwave oven of this structure, be arranged on the turntable 9 in heating chamber 2 and place conditioning table (the food that needs conditioning is placed on this conditioning table) or container, operate the operation switch not shown in the figure, magnetic control After the tube 7 is connected to the high-voltage power supply, it oscillates and produces high-frequency waves, and the high-frequency waves are introduced into the stirrer cover 3 along the waveguide 6, and are also introduced into the stirrer blade 5 (the blade 5 is arranged in the stirrer 3, can be rotated).

At this time, the stirrer blade 5 is rotated by the fan force of the cooling fan 8 (the fan is driven after being energized), and evenly disperses the high-frequency waves hitting the casing, and supplies it to the heating chamber 2, thereby The food on the turntable 9 is induction heated.

At the same time, the above-mentioned turntable 9 is rotated by the drive unit 10 (the drive unit is driven after energization), so that the food on the turntable 9 is generally irradiated by high-frequency waves, so that the food is induction heated more quickly.

But, adopt the microwave oven turntable driving device of this structure, in order to effectively utilize the space conditioning food in the heating chamber 2, need to put the food placement position in the heating chamber 2 to be adjusted to the prescribed height, this structure exists not enough. The problem of meeting the above requirements is that the turntable 9 can only be rotated by transmitting the driving force of the driving device 10, but cannot be raised or lowered.

For this reason, someone proposed Japanese Utility Model Publication No. 1-150396 as a solution to the above problems. As shown in Figure 2, the microwave oven turntable driving device of the publication is composed of a turntable rotating device 20 and a turntable lifting device 30, wherein the function of the rotating device 20 is to rotate the turntable 9, and the function of the lifting device 30 is to make the above-mentioned Turntable 9 lifts.

That is to say, the above-mentioned turntable rotating device 20 is structured like this, that is, a first motor 21 (the motor is driven after being energized) is provided on the inner bottom surface of the above-mentioned case cover 1, and a driving motor is connected to the top of the first motor 21. Connector 22, the driving connector 22 is connected to the driven connector 23 through a serrated spline connection, the driven connector is protruding downwards and arranged at the center of the bottom surface of the turntable 9, and penetrates the heating chamber 2 the underside.

In addition, the turntable elevating device 30 is provided with first and second sliding rods 33 and 34 to support and lift the turntable 9 . The slide bars 33, 34 are guided by first and second guide members 31, 32 provided on the bottom surface of the heating chamber 2, respectively. At the lower ends of the above-mentioned first and second sliding rods 33 and 34, a pair of first and second left side link members 35a and 35b are respectively connected (the effect of this member is to limit the first sliding rod 33 and the second sliding rod 34 lifting movement distance) and a pair of first and second right side link members 36a, 36b, these members are hinged and can be bent.

In the hinge part connecting the above-mentioned first left connecting member 35a, the second left connecting rod member 35b and the first right connecting rod member 36a, the second right connecting rod structure 36b, it is connected with a hinge joint. A connecting link member 37 that can move forward and backward, which can drive the above-mentioned link members to the lifting direction at the same time, and can be folded. A drive link member 38 is hingedly coupled to a hinge joint portion connecting the first right link member 36a and the second right link member 36b to move the connecting link member 37 back and forth. At the other end of the driving link member 38, a worm wheel 40 with a cam 39 is provided to drive the link member 38 to reciprocate back and forth and to switch the direction of rotation. The worm wheel 40 meshes with a worm 42 connected to the second motor 41 . The unexplained symbol 50 in the figure represents a sensing device, which is used to sense the position of the turntable 9, and the sensing device is provided on one side of the bottom surface of the heating chamber 2 adjacent to the first guide member 31 above.

Adopt the turntable driving device of the existing microwave oven of this structure, when operating the operating device not shown in the figure to drive the second motor 41, then the second motor 41 is just connected with the power supply, while driving, the limit is fixed on the figure. The worm 42 on the motor shaft not shown in the figure rotates, the worm wheel 40 meshed with the worm 42 rotates, and the cam 39 combined with the worm wheel 40 is moved at the same time, so that the cam 39 makes the drive link member 38 reciprocate back and forth Movement, the drive link member 38 is movably connected to one side of the cam 39 in a hinge joint manner.

In this case, the driving link member 38 makes the connecting link member 37 connected at one end by the hinge to reciprocate back and forth. The left link member 35a, the second left link member 35b and the first right link member 36a, the second right link member 36b are folded in the lifting direction at the same time, when the above-mentioned first left link member 35a, The second left link member 35b and the first right link member 36a, when the second right link member 36b is folded in the lifting direction at the same time, the first left link member 35a and the second right link member The upper ends of 36a are hingedly connected first and second sliding rods 33 and 34 respectively, guided by first and second guide members 31 and 32, while lifting and lowering the turntable 9 mounted on its upper end surface. Lifting, in the heating chamber 2, the above-mentioned turntable 9 is lifted and adjusted to a specified height.

In this case, since the driven connector 23 located on the lower side of the turntable 9 is combined with the driving connection 22 fixed on the shaft of the first motor 21 in the form of a fine-toothed spline, when the above-mentioned first and second When the two sliding rods 33, 34 are raised and lowered, the driven connector 23 is in the state of being combined with the drive connector 22 in a serrated spline manner, and moves the turntable 9 up and down while moving up and down along the length direction.

In addition, the above-mentioned turntable 9 rotates in the direction of rotation of the second motor 41, and rises and falls while rising and falling. 50 of the sensing signal, and the second motor 41 is stopped by the control device not shown in the figure, and the turntable 9 rotates in the direction of rotation of the first motor 21, and rises to a prescribed height.

Therefore, if the turntable driving device of the existing microwave oven with the above-mentioned structure is adopted, its driving method is composed of a worm method and a plurality of connecting rod methods, wherein the worm method is used to transmit the power of the second motor 41 and change the rotation angle; The method is used to transmit the rotational power of the above-mentioned worm method, while performing joint motion, at least three points are used to support the turntable 9, and at the same time, the turntable 9 is lifted and lowered. question.

In addition, when the turntable 9 is driven to rotate, since the plurality of slide rods 33, 34 (which support the turntable 9 at three points at predetermined heights) are always in contact with the bottom surface of the turntable 9, there is a possibility that noise is generated. Friction causes wear on parts, and it is difficult to reliably perform three-point support.

In addition, patent documents GB-A-1092484 and US-A-4725703 also respectively disclose a microwave oven. The microwave oven turntable driving device disclosed in the patent document GB-A-1092484 has a first motor that rotates the turntable shaft through the meshing of a pair of gears and a second motor that can lift the turntable shaft after activation. And the patent document US-A-4725703 discloses a kind of technical scheme that utilizes rotating cam and supporting roller to abut to make the turntable shaft go up and down. However, the technical solutions disclosed in these reference documents also have many shortcomings mentioned above.

Contents of the invention

For this reason, the present invention is developed in order to solve the above-mentioned various problems, and its purpose is to provide such a microwave oven turntable driving device, which is driven by a motor to drive and drive a plurality of gears to make the turntable rotate. , so that the turntable is easy to rotate, and the axis of the turntable is raised and lowered along the inclined track, so that the turntable can be raised and lowered, the structure is simple, and the number of parts is reduced, so the manufacturing cost can be reduced.

A second object of the present invention is to provide a microwave oven turntable driving device which can prolong the life of a retainer member supporting the turntable shaft and which can move the turntable shaft smoothly without generating noise and vibration.

A third object of the present invention is to provide such a microwave oven turntable driving device, the turntable rotation motor and the turntable lifting motor are arranged at corresponding positions on the left and right, so that it is easy to improve the assembly by a plurality of gears meshing with each other, and improve the overall operating efficiency.

The fourth object of the present invention is to provide such a microwave oven turntable driving device, that is, when the turntable shaft cannot be lowered smoothly due to the eccentric load applied to the turntable shaft due to the unbalanced food placed on the turntable shaft when the turntable shaft is lowered , The device of the invention can force the turntable shaft to descend, so as to guide the turntable shaft to go up and down smoothly, and prevent malfunctions.

In order to achieve the above object, the present invention provides a microwave oven, comprising

a heating chamber;

a microwave generator supplying microwaves to said heating chamber;

a food support device comprising a turntable disposed in the heating chamber, and a shaft protruding downwardly from the turntable out of the heating chamber;

A driving mechanism arranged under the heating chamber is used to rotate the turntable around a first vertical axis and to move the turntable in a vertical direction, the driving mechanism comprising:

a rotary cam rotatable about a second vertical axis oriented parallel to said first axis and comprising an upwardly facing track surface against which the lower portion of said shaft abuts, said track surface being configured such that said shaft and the turntable move alternately in upward and downward directions corresponding to the rotation of said cam, said cam including a traction member rotatable therewith and spaced above said track surface from said track surface, said traction member resting on part of the shaft to ensure movement of the shaft in a downward direction; and

An electric transmission for rotating the shaft and the turntable about the first axis and for rotating the rotating cam about the second axis.

The microwave oven turntable driving device of the present invention is characterized in that the microwave oven turntable driving device has a turntable shaft that rotates or lifts the turntable; it is fitted on the turntable shaft and is used to transmit the power of the driving source to rotate the above-mentioned turntable shaft; transmission gear; An upper and lower journal member provided on the upper and lower sides of the transmission gear and rotates; and a cage member that supports the transmission gear and the upper and lower journal members for rotation.

In addition, the microwave oven turntable driving device of the present invention is characterized in that the driving device has a first motor provided on the case cover and rotating the turntable shaft (the turntable shaft is combined with the turntable); The left-right symmetrical second motor; it is arranged on the above-mentioned substrate and transmits the power of the second motor to make the rotary cam lift the turntable shaft; the traction member arranged on the rotary cam, when the turntable shaft descends with the rotation of the rotary cam When the turret axis does not descend due to unbalanced load applied to the turret axis (eccentric load), the turret axis can be forcibly lowered.

Description of drawings

Fig. 1 is a general longitudinal sectional view of a common microwave oven;

Fig. 2 is a longitudinal sectional view showing a conventional turntable driving device;

Fig. 3-Fig. 5 is the figure representing embodiment 1 of the present invention;

Fig. 3 is a top view showing the turntable driving device of the present invention;

Fig. 4 and Fig. 5 are the D-D line longitudinal sectional views of Fig. 3 respectively showing the lowest position and the highest position of the turntable shaft;

Fig. 6 is a perspective view showing that the sixth gear in Fig. 3 is combined with the turntable shaft;

Fig. 7-Fig. 8 is the figure representing embodiment 2 of the present invention;

Fig. 7 is a longitudinal sectional view showing the turntable driving device of the present invention;

Fig. 8 is an enlarged sectional view of important parts of part E of Fig. 7;

Fig. 9-Fig. 15 is the figure representing embodiment 3 of the present invention;

Fig. 9 is an exploded perspective view showing the turntable driving device of the present invention;

Fig. 10 is a joint top view of important parts in Fig. 9;

Figure 11 is a sectional view of Figure 10;

Fig. 12 is a plan view of important parts for explaining the action of the device of the present invention;

Figure 13 is a side view showing the entry of the axial traction member of the turntable;

Fig. 14 is a side view of important parts showing the state of raising the turntable shaft by the rotating cam;

Fig. 15 is a side view of important parts showing a state in which the turntable shaft is forcibly lowered by a pulling member.

An embodiment of the present invention will be described in detail below in conjunction with the accompanying drawings.

The preferred embodiment 1 of the present invention will be described in detail below with reference to accompanying drawings 3-6.

Detailed ways

In the figure, the same structure as the existing device adopts the same name and the same symbol, which will not be described again.

In Fig. 3-Fig. 6, the bottom surface of the heating chamber 2 is provided with the turntable shaft 70 that makes the turntable 9 rotate, and the first motor 207 is provided on one side of the case cover member 205, so that power supply and drive, on the turntable shaft The outer periphery of the turntable shaft 70 is provided with a sixth gear 209 for rotating the turntable shaft 70 .

In addition, a seventh gear 211 is provided on an unillustrated motor shaft (the motor shaft protrudes from the first motor 207 ) to mesh with and rotate the sixth gear 209 . For power supply and driving, a second motor 215 is provided on one side of the substrate 213 . An eighth gear 217 is provided on an unshown motor shaft (the motor shaft protrudes from the second motor 215 ) so as to be interlocked with the driving of the second motor 215 . In order to mesh with the eighth gear 217 and move the turntable shaft 70 up and down, a rotating cam 221 is provided on the other side of the base plate 213 via a fastening shaft 219 so as to be freely rotatable.

At this time, the turret shaft 70 has a D-shape so as to be rotated in conjunction with the rotation of the sixth gear 209 . A hemispherical surface 203 a is formed at one end of the turntable shaft 70 in order to make the turntable shaft 70 slide along the inclined surface of the rotary cam 221 in point contact. A bearing 223 is provided on the outer peripheral surface of the hemispherical surface 203a so that the turntable shaft 70 can be smoothly rotated and raised and lowered without wandering. The bearing 223 is supported by a cage member 227 fixed to the case member 205 by a plurality of fastening members 225 .

The sixth gear 209 has a through hole 209a having a D-shaped inner peripheral surface larger than the D-shaped outer peripheral surface of the turntable shaft 70 so as to move in the ascending and descending direction as the turntable shaft 70 rotates.

The cover member 205 and the base plate 213 are respectively bent outward to form flanges not shown in the figure, so that when the cover member 205 and the base plate 213 are combined, fastening members 229 can be used to combine the contacting parts.

On the outer peripheral surface of the lower end of the rotary cam 221, gear teeth 221a meshing with the eighth gear 217 are formed, and an inclined portion 221b having a predetermined angle is formed on the upper end of the rotary cam 221 so that the turntable shaft 70 can be raised and lowered. On the upper surface of the edge portion of the above-mentioned inclined portion 221b, a hemispherical inclined track surface 221c is formed so that the turntable shaft 70 slides by point contact, and performs rotation and elevation motion.

In the figure, an unexplained symbol 231 denotes a sensor, and the sensor 231 is provided on one side of the above-mentioned base plate 213. When the turntable shaft 70 descends to the lowest position, the sensor 231 can sense its position.

In the microwave oven turntable driving device of Embodiment 1 of the present invention with this structure, the lifting action of the turntable shaft 70 is described as follows. First, in the initial support state, the sensor 231 senses that the turntable shaft 70 has dropped to the lowest position. 215 is driven to rotate the motor shaft, and with the rotation of the motor shaft, the eighth gear 217 is rotated while meshing with the rotary cam 221, and the rotary cam 221 is also rotated.

In this case, the above-mentioned rotating cam 221 rotates, and when the height difference of the inclined portion 221b above it changes, the hemispherical surface 203a at the lower end of the turntable shaft 70 just follows the hemispherical inclined track surface 221c (the hemispherical inclined track 221c is formed on the inclined portion 221b) slides, and repeats the lifting motion.

At the same time, the position of the above-mentioned turntable shaft 70 is controlled by controlling the rotational speed of the second motor 215 , and the position changes with the height of the turntable shaft 70 .

Next, the rotational movement of the turntable shaft 70 will be described in detail. As the first motor 207 is driven, the motor shaft rotates to rotate the seventh gear 211 coupled to the motor shaft. While rotating, the seventh gear 211 rotates the sixth gear 209 meshing with its outer peripheral surface. This sixth gear 209 rotates, then makes above-mentioned turntable shaft 70 (this turntable shaft 70 is inserted in the through hole 209a of the sixth gear 209) also rotate simultaneously, so the turntable 9 that is combined in the turntable shaft 70 upper end also rotates.

Therefore, the turntable shaft 70 moves up and down the turntable 9 while moving up and down along the inclined track of the rotary cam 221 . Simultaneously, along with the rotation of the sixth gear 209, the turntable shaft 70 rotates, so the turntable 9 also rotates, and like this, the turntable shaft 70 just carries out the three-dimensional motion of rising and falling along with the rotation of the turntable 9.

As mentioned above, the microwave oven turntable driving device of the above-mentioned embodiment 1 is provided with first and second motors 207 and 215 respectively on one side, wherein the driving force of the first motor 207 is transmitted to the sixth gear 209 to make the turntable rotate at the same 70 degrees. . In this way, the turntable 9 is also rotated; the driving force of the second motor 215 is transmitted to the rotary cam 221, and the turntable shaft 70 is lifted along the inclined track. , the structure is simple, and the number of components is reduced, so the manufacturing cost can be saved.

The preferred embodiment 2 of the present invention will be described in detail below according to FIG. 7 and FIG. 8 .

In the figure, the parts with the same structure as those in Embodiment 1 use the same names and symbols, and will not be described again.

In Fig. 7 and Fig. 8, the turntable rotating mechanism 300 is located in the space between the case cover member 205 and the base plate 213, and is arranged on the case cover member 205; the turntable lifting mechanism 310 is located between the case cover member 205 and the base plate 213 In the space, and is provided on the base plate 213; The power transmission mechanism 320 is located in the space between the case cover member 205 and the base plate 213, and is provided on the case cover member 205.

The power transmission mechanism 320 is coupled to the outer peripheral surface of the turntable shaft 70 (the turntable shaft is coupled to the turntable 9 ) by fitting the upper and lower journal members 324 and 326 . Between the upper and lower journal members 324, 326, through the transmission gear 328 fitted on the outer peripheral surface of the above-mentioned turntable shaft 70, the upper and lower journal members 324, 326 are combined, and the upper and lower journal members The outer peripheral surfaces of the members 324 and 326 support a retainer member 330 for rotational movement, and the retainer member 330 is coupled to the case member 205 .

At this time, the above-mentioned upper and lower side journal members 324 and 326 are fitted on the outer peripheral surface of the turntable shaft 70 that is partially cut into a D shape, and a through hole is formed in the center (the through hole is not shown in the figure). , for a smooth swipe. Wherein, an annular groove 326a is formed on the upper surface of the lower holder member 326 .

Additionally, the upper and lower cage members 324, 326 are made of metal coated with plastic or Teflon.

In addition, the center of the above-mentioned transmission gear 328 is cut into a D-shaped inner peripheral surface, and the inner peripheral surface is fitted with the outer peripheral surface that is cut into a D-shaped upper part of the turntable shaft 70, and the outer peripheral surface of the seventh gear 221 (the The gear is meshed with the shaft of the first electric motor 207).

At this time, an annular projection 328 a is formed on the lower surface of the transmission gear 328 , and the annular projection is inserted into a groove 326 a formed on the upper surface of the lower journal member 326 .

In addition, the transmission gear 328 (the transmission gear can rotate) is incorporated in the above-mentioned holder member 330, and a part of the outer peripheral surface of the transmission gear 328 is exposed in the side direction, and a part of the peripheral surface is exposed in order to mesh with the sixth gear 211. is cut.

With the microwave oven turntable driving device of Embodiment 2 of the present invention having such a structure, once the first motor 207 is driven, the sixth gear 211 combined with the shaft of the first motor 207 rotates and meshes with the sixth gear 211. The transmission gear 328 of the transmission gear 328 also rotates, so the turntable shaft 70 fitted on the transmission gear 328 rotates simultaneously, so that the turntable 9 also rotates.

At this time, when the above-mentioned turntable shaft 70 rotates, the upper and lower side journal members 324, 326 slide in the holder member 330, and the upper and lower side journal members 324, 326 are fitted on the turntable shaft 70, and the transmission gear 328 is used as a guide. The center is joined at its upper and lower sides.

The contact of the minimum area of the protrusion 328a and the groove 326a acts as a rotation guide, so that the turntable shaft 70 can be rotated smoothly. correspondingly combined.

As mentioned above, with the microwave oven turntable driving device according to Embodiment 2 of the present invention, when the rotation function and the lifting function of the turntable shaft 70 work independently of each other, the upper and lower side journal members 324, 326 (the journal members are rotatable) Being in the middle of the turntable shaft 70 and the retainer member 330 can reduce the wear and tear of the retainer member 330. Therefore, adopting this device can receive the following effect, that is, prolong the life of the retainer member 330, and can make the action of the turntable shaft 70 Round slide, eliminate noise and vibration.

The following describes the preferred embodiment 3 of the present invention in detail according to FIG. 9-FIG. 15 .

In the figure, the parts with the same structure as those in Embodiment 1 use the same names and symbols, and will not be described again.

9-15, the bottom surface of the heating chamber 2 is embedded with a turntable shaft 70 that rotates the turntable 9, and a first motor 207 is provided on one side of the case cover member 205, which is driven after the power is turned on. A sixth gear 209 is engaged with the outer circumference of the turntable shaft 70 to rotate the turntable shaft 70 .

In order to mesh with the sixth gear 209 and make the sixth gear 209 rotate, a seventh gear 211 is combined on the motor shaft of the first motor 207 mentioned above. Direction is provided with second electric motor 215, just can drive after energizing. The eighth gear 217 is combined on the shaft of the second motor 215, so as to be interlocked with the driving of the second motor 215, and on the other side of the above-mentioned base plate 213, a rotating cam 410 is provided (the cam passes through the fastening shaft 219 is free to rotate), so as to mesh with the eighth gear 217 to make the turntable shaft 70 carry out lifting motion.

At this time, the shape of a predetermined portion on the outer peripheral surface of the above-mentioned turntable shaft 70 is cut into a D shape so as to be interlocked by the rotation of the sixth gear 209, and the holder member 227 is coupled to the D-shaped outer peripheral surface to Make the turntable shaft 70 not to swim, and can rotate smoothly in a garden, and can also lift simultaneously. The cage member 227 is combined with the bottom surface of the above-mentioned case member 205 through a plurality of fastening members 225, and a bearing 223 with good wear resistance is embedded on its inner peripheral surface, so that the turntable shaft 70 can rotate smoothly. and lifting.

In addition, at the lower end of the above-mentioned turntable shaft 70, a hemispherical contact member 400 made of synthetic resin is combined by fusion bonding so as to make point contact along the joint track surface of the above-mentioned rotary cam 410, which is easy to slide and the rotary cam 410 is not worn.

At this time, on the outer periphery of the upper end of the above-mentioned contact member 400, a joint protrusion 400a is integrally protruded, and its outer diameter is larger than that of the turntable shaft 70, so that the turntable shaft 70 is forced to descend by the pulling action of the pulling member described later.

In the center of the sixth gear 209, a through hole 209a having a D-shaped inner peripheral surface larger than the D-shaped outer peripheral surface of the turret shaft 70 is drilled so as to be raised and lowered as the turret shaft 70 rotates.

On the above-mentioned box cover member 205 and the base plate 213, there are flanges (not shown) that are integrally formed by bending outward, respectively, so that when they are combined, the sides where the two are connected are combined by fasteners. together.

Gear teeth 410 a are formed on the outer peripheral surface of the lower end of the rotary cam 410 so as to mesh with the eighth gear 217 . An inclined wall 410b having a predetermined angle is formed on the outer peripheral surface of the upper end of the rotary cam 410 to facilitate the lifting movement of the turntable shaft 70 . A concave hemispherical inclined track surface 410c is formed on the inclined wall 410b, so that when the rotary cam 410 rotates, the turntable shaft 70 and the contact member 400 (the contact member is fused and adhered to the lower end of the turntable shaft 70) are always in a contact state. down for lifting motion. A plurality of engaging grooves 410d are formed at certain intervals on the edge of the flat part above it, so that the traction member described later can be combined on the edge of the above-mentioned flat part by the action of elastic force.

Furthermore, the above-mentioned inclined wall 410b is formed in an annular shape, and its upper surface is an inclined surface that gradually increases on one side and is lower on the other side. In order to slide the pressing member 400 coupled to the lower portion of the turntable shaft 70, an inclined rail 410c is formed on the upper surface of the inclined wall 410b.

The traction member 420 is combined with the rotary cam 410, and when the rotary cam 410 is rotated to lower the turntable shaft 70, when the rotary table shaft 70 cannot be lowered due to an eccentric load applied to the rotary cam 410, the traction member 420 can forcibly lower the turntable shaft. 70 drops.

That is to say, when the traction member 420 is inserted through the upper part of the rotating cam 410 and is positioned at the inner peripheral edge of the inclined wall 410b, an annular housing 420a is formed on it (the annular housing has a height corresponding to the height above the inclined wall 410b). angle of inclination). When the rotary cam 410 rotates around the upper side of the housing 420a, in order to force the turntable shaft 70 to descend, the semicircular traction projection 420b (this projection is used to pull the stopper of the contact member 400 that is combined in the turntable shaft 70 bottom) The protrusion 400a) is bent outwards at a right angle. At predetermined positions around the lower surface of the housing 420a, a plurality of fixing protrusions 420c protrude so that the traction member 420 is coupled to the rotary cam 410, and the traction member 420 is correspondingly and elastically inserted into the rotary cam 410. The plurality of card slots 410d formed on the flat part.

At this time, as shown in FIG. 12 , when the turntable shaft 70 is lowered by the rotation of the rotary cam 410, the pulling protrusion 420b presses down the stopper protrusion 400a of the lower contact member 400 of the turntable shaft 70. The bending is performed from the highest inclination section to the lowest inclination section within a distance of 360°C on the inclined track surface 410c.

That is to say, the section R1 in which the turntable shaft is lowered by the above-mentioned traction protrusion 420b is formed with extensions L1, L2 of predetermined lengths at both ends, so that the lowering section R1 of the turntable shaft has a longer distance than the rising section R2 of the turntable shaft 70. Section, in which the extension part L1 is bent upwards at a predetermined angle to form an entry port, so that the coupling protrusion 400a of the contact member 400 can easily enter the descending section R1 of the above-mentioned turntable shaft.

In the figure, reference numeral 231 is arranged on one side of the above-mentioned base plate 213, and represents a first sensor, and when the turntable shaft 70 is lowered to a low position, the position can be sensed; 232 is a second sensor arranged on one side of the case member 205, When the seventh gear 211 rotates, 232 is locked by the protrusion shown in the figure (the protrusion is formed on the seventh gear 211 ), which can control the rotational speed of the first motor 207 .

The lifting operation of the turntable shaft 70 in the microwave oven turntable drive device of Embodiment 3 of the present invention adopting this structure is introduced below. First, in the initial standby state, when the first sensor 231 senses that the turntable shaft 70 has dropped to the lowest position, The motor shaft rotates with the driving of the second motor 215, and with the rotation of the motor shaft, the eighth gear 217 rotates while making the rotating cam 410 engaged on the eighth gear 217 move in one direction (for example, to the left). ) to rotate.

At this time, the rotary cam 410 rotates while changing the height difference of the inclined wall 410b formed thereon. At this time, the turntable shaft 70 slides along the hemispherical inclined track surface 410c in a point contact manner while repeatedly moving up and down. The above-mentioned hemispherical inclined track surface 410c is formed in such a way that the hemispherical upper surface of the contact member 400 (the contact member is integrated with the turntable shaft at the lower end of the turntable shaft by fusion bonding) is formed on the above-mentioned inclined wall. The upper surface of 410b is sunken.

That is to say, when the rotary cam 410 rotates to the left, when the inclined track surface 410c of the C part passes through the lower part of the turntable shaft 70, the turntable shaft 70 is in the state of the maximum height as shown in FIG. 410c starts to the turntable shaft descending section R1 connected with the inclined track surface 410c of the H part and the inclined track surface 410c of the I part. When the inclined track surface 410c reaches the lower part of the turntable shaft 70, the turntable shaft is in the state of the lowest height. From the inclined track surface 410c of the I part to the rising section R2 of the turntable shaft connected to the inclined track surface 410c of the J part and the inclined track surface 410c of the G part, when passing through the lower part of the turntable shaft 70 sequentially, the turntable shaft 70 slowly Ascending, when the inclined track surface 410c of the G part reaches the bottom of the turntable shaft 70, the turntable shaft just rises to the highest point of J, and the operation is repeated like this.

At this time, when the inclined track surface 410b of the G portion of the rotating cam 410 passes through the lower portion of the turntable shaft 70, as shown in FIG. The turntable axis falls on the interval R1. The end of the traction protrusion 420b of the traction member 420 (the traction member rotates together with the rotary cam 41) is bent upwards at a prescribed angle to form an extension L1. Because of this extension L1, it is easy to enter the traction protrusion 420b and the inclined track. In the middle of the surface 410c, the turntable shaft 70 can be forced to descend.

In addition, when the turntable shaft 70 entering the middle of the traction protrusion 420b and the inclined track surface 410c passes through the descending section R1 of the turntable shaft, as shown in FIG. The eccentric load is produced on the turntable shaft 70, causing the malfunction that the turntable shaft cannot fall by its own weight.

In addition, after passing through the descending section R1 of the turret shaft, when the rising section R2 of the turret shaft passes too much under the turret shaft 70, as shown in FIG. The inclined track surface 410c of the rotary cam 410 is forced to rise.

At this time, control of the position corresponding to the height of the turntable shaft 70 is performed by controlling the rotation speed of the second motor 215 .

The rotary motion of the turntable shaft 70 will be described below. The first motor 207 is driven, and the motor shaft rotates to rotate the seventh gear 211 coupled to the motor shaft. The seventh gear 211 rotates while meshing with its outer peripheral surface. The sixth tooth 209 on the top rotates, and the sixth gear 209 rotates while simultaneously rotating the turntable shaft 70 inserted into the through hole 209a of the sixth gear 209, so the turntable 9 coupled to the upper end of the turntable shaft 70 also rotates.

Therefore, when the turntable shaft 70 ascends and descends along the inclined track surface 410c of the rotary cam 410, along with the rotation of the sixth gear 209, the turntable shaft 70 also rotates simultaneously. Rotational motion is also performed while lifting motion.

As mentioned above, adopt the microwave oven turntable driving device of embodiment 6 of the present invention, first, second electric motor 207,215 is arranged on one side on the opposite direction of left and right, wherein the driving force of first electric motor 207 is transmitted to the sixth gear 209 , so that the turntable shaft 70 is rotated, so that the turntable 9 is also rotated; the driving force of the second motor 215 is transmitted to the rotary cam 410, so that the turntable shaft 70 is lifted and lowered along the inclined track surface 410c, so the turntable 9 can be raised and lowered. structure, so the following effects can be obtained, that is, the structure is simple, the number of parts is reduced, and the manufacturing cost can be reduced.

In addition, when assembling the first motor 207 to the case member 205, the seventh gear 211 is meshed with the sixth gear 209, and when assembling the second motor 215 on the base plate 213, the eighth gear 217 is meshed with the rotary cam 410. , and then when the above-mentioned case cover member 205 and the base plate 213 are assembled with each other with a plurality of fastening members 229, the contact member 400 at the lower end of the turntable shaft 70 can be automatically installed on the inclined track surface 410c of the rotary cam 410, because this structure , Therefore, the following effect can also be obtained, that is, it is not necessary to spend man-hours to assemble the gear, so that the work efficiency can be further improved.

In addition, when the turntable shaft 70 descends along the inclined track surface 410c of the rotary cam 410, the load applied to the turntable shaft 70 is unbalanced due to the unbalanced food placed on the turntable 9, so that the turntable shaft 70 cannot rely on its own weight to move smoothly. decline, and the present invention is provided with a traction member 420 on the rotating cam 410, which can forcefully descend the turntable shaft 70. Due to such a structure, it is possible to obtain the effect of guiding the turret shaft 70 to move up and down smoothly and preventing malfunctions.

Claims (14)

1. A microwave oven, comprising a heating chamber; a microwave generator supplying microwaves to said heating chamber; a food support device comprising a turntable disposed in the heating chamber, and a shaft protruding downwardly from the turntable out of the heating chamber; A driving mechanism arranged under the heating chamber is used to rotate the turntable around a first vertical axis and to move the turntable in a vertical direction, the driving mechanism comprising: a rotary cam rotatable about a second vertical axis oriented parallel to said first axis and comprising an upwardly facing track surface against which the lower portion of said shaft abuts, said track surface being configured such that said shaft and the turntable move alternately in upward and downward directions corresponding to the rotation of said cam, said cam including a traction member rotatable therewith and spaced above said track surface from said track surface, said traction member resting on part of the shaft to ensure movement of the shaft in a downward direction; and An electric transmission for rotating the shaft and the turntable about the first axis and for rotating the rotating cam about the second axis. 2. The microwave oven according to claim 1, wherein the lower end of the shaft is a convex curved surface and substantially makes point contact with the surface of the rail. 3. The microwave oven of claim 2, wherein the surface of the track is a concave curved surface viewed in cross-section. 4. The microwave oven according to claim 2, wherein said shaft includes a shaft portion and a synthetic resin contact member mounted on a lower end thereof with said convex curved surface. 5. The microwave oven according to claim 1, characterized in that, the shaft comprises a radially outwardly protruding toggle protrusion spaced above from the lower end of the shaft, the toggle protrusion extends below the traction member. 6. The microwave oven according to claim 1, wherein the rotating cam comprises a hollow vertical wall, the track is arranged on the upper end of the wall, and the toggle member is installed inside the wall. 7. The microwave oven according to claim 6, wherein said rotary cam includes a lower portion having an upwardly facing surface forming a bottom portion of said vertical wall hollow portion, said bottom portion being formed on said bottom portion. There is a card slot, and the said traction member includes a downward protruding hook-shaped protrusion that is locked into the corresponding card slot. 8. The microwave oven according to claim 6, wherein the rotary cam includes gear teeth protruding from an outer peripheral surface thereof for receiving rotational driving force from the electric transmission mechanism. 9. The microwave oven of claim 1, wherein said track surface is annular and lies in a plane inclined at an acute angle with respect to the horizontal, said track surface comprising a single high point and a single low point, whereby a first portion of the track surface extending between the low and high points raises the shaft, and a second portion of the track surface extending between the low and high points Lower the shaft. 10. The microwave oven of claim 9, wherein the pulling member extends over an angle greater than 180[deg.] and less than 360[deg.], which extends along the entire second portion of the rail surface. 11. The microwave oven according to claim 10, wherein an end of said pulling member, under which said shaft passes during rotation of said rotary cam, is bent upward. 12. The microwave oven of claim 1, wherein said drive mechanism includes first and second motors spaced substantially obliquely opposite with respect to said second axis, said first motor being operatively connected to The shaft is for rotating the shaft and the second motor is operatively connected to the rotating cam for rotating the rotating cam. 13. The microwave oven according to claim 1, wherein the electric transmission mechanism comprises: first and second motors; a first pair of gears respectively mounted on the first motor and the shaft for rotating the shaft around a first axis; and The second pair of gears respectively installed on the rotating cam and the second motor are used to rotate the rotating cam. 14. The microwave oven of claim 13, wherein said first and second motors are spaced approximately 180[deg.] apart relative to said second axis.

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