KR100188971B1 - Turn table driving apparatus for electric range - Google Patents

Abstract

A turntable driving device for a microwave oven is disclosed. A characteristic of the disclosed turntable driving device is configured to rotate and lift-drive the turntable by a single drive motor, and to coaxially couple a rotation shaft provided with a cam member and a lead screw to an output shaft of the drive motor, A cam follower member having a threaded portion formed to be selectively engaged with the lead screw portion by contact is installed on one side of the rotary shaft, and the screw portion of the cam follower member leads the lead of the rotary shaft according to the contact state of the cam member and the cam follower member. The turntable coupled to the rotary shaft may be rotated and lifted by being engaged or spaced from the screw part. According to these features, it is possible to simplify the configuration, thereby resulting in stability of operation, reduction in manufacturing cost, and improvement in productivity.

Description

Microwave Turntable Drive

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microwave oven, and more particularly, to a turntable driving apparatus for elevating and driving a turntable on which food is mounted and rotated.

As is well known, a microwave oven (Micro Wave Oven) is a cooking apparatus that can cook the outside and inside of the food at the same time by a dielectric heating method using microwaves, that is, microwaves in the same frequency band as color TV. Such a microwave is provided with a cooking chamber formed in a space of a constant size, and inside the cooking chamber is provided with a turntable on which food is mounted and rotated. In general, the turntable is installed so that the rotational movement and the lifting movement can be performed at the same time so that food can be cooked more quickly and evenly.

The conventional microwave turntable driving apparatus includes a driving motor for rotating the turntable and a driving motor for lifting and lowering the turntable rotated by the driving motor, thereby increasing manufacturing costs and lowering productivity. have.

Therefore, the technical problem to be achieved by the present invention is to solve the problems of the conventional microwave turntable driving apparatus as described above, an object of the present invention is to reduce the manufacturing cost by rotating and lifting the turntable by a single drive source and It is to provide a microwave turntable driving device that can improve the productivity.

1 and 2 is a schematic cross-sectional view showing the configuration and operation of the microwave turntable driving apparatus according to the present invention,

3 is a schematic perspective view showing an extract of a cam member of the microwave turntable driving apparatus shown in FIGS. 1 and 2.

Explanation of symbols for main parts of the drawings

10. Turntable 100. Cooking room base plate

110. Base frame 120. Bracket member

130. Guide member 140. Tension spring

150..Drive motor 160..Cam member

161..cam curve 170..rotation shaft

171.Lead screw part 180..Cam follower member

181..Thread 182..Protrusion

190. Guide member 200. Compression spring

In order to achieve the above object, a microwave turntable driving apparatus according to the present invention includes a bracket member installed on a base frame attached to a bottom surface plate of a microwave cooking chamber to enable elastic lifting and moving, and mounted on the bracket member. A drive motor installed to be connected to the drive shaft, a cam member coupled to the output shaft of the drive motor, a lead screw portion provided to extend with the output shaft of the drive motor, a rotating shaft having an end portion coupled to the center of the turntable, and the cam member. It characterized in that it comprises a cam follower member having a one-way elastic biased to the base frame so as to enable elastic horizontal movement by contact, and a screw portion that is selectively engaged with the lead screw portion by the horizontal movement.

In the microwave turntable driving apparatus according to the present invention, in particular, the bracket member is provided so that the elastic lifting movement can be guided by the guide member installed on the base frame, and in one direction by a tension spring installed on the base frame. It is preferable that the elastic bias is installed.

In addition, the cam follower member is provided to guide the elastic horizontal movement by the guide member installed on the base frame, it is preferably installed to elastically bias in one direction by the compression spring installed on the base frame, the bracket member And a bearing member is provided between the guide member and between the cam follower member and the guide member.

In addition, damping means are provided between the bracket member and the base frame and between the cam follower member and the base frame so as to minimize impact or vibration during the flow of the bracket member and the cam follower member. desirable.

As another embodiment of the present invention, the lead screw portion of the rotary shaft may be formed of a worm, and the screw portion of the cam follower member may be composed of a worm gear formed to engage the worm.

Hereinafter, with reference to the accompanying drawings will be described in detail the microwave turntable driving apparatus of the present invention according to a preferred embodiment.

1 and 2 are schematic cross-sectional views showing the configuration and operation state of the microwave turntable driving apparatus according to the present invention. Referring to this, first, the configuration of the microwave turntable driving apparatus according to the present invention will be described.

The guide member 130 is elastically biased downward by the tension spring 140 supported on the bottom of the base frame 110 coupled to the bottom plate 100 of the microwave cooking chamber to enable elastic lifting movement. ) Is installed in a supported state, and a driving motor 150 is mounted on the bracket member 120. In addition, a disc shaped cam member 160 having a cam curve portion 161 formed at one end thereof as protruding from the output shaft 151 of the driving motor 150 is coaxially coupled. The rotation shaft 170 coupled in a vertical state on the center of the cam member 160 is installed to extend with the output shaft of the drive motor 150.

On the other hand, the rotating shaft 170 has a lead screw portion 171 has a predetermined length from the lower end, the upper end of the lead screw portion 171 is coupled to the center of the turntable 10 is located inside the cooking chamber of the microwave oven. . In addition, a cam follower member 180 having a protruding portion 182 contacting the cam member 160 and a screw portion 181 formed to engage with the lead screw portion 171 is formed at one side of the rotation shaft 170. It is elastically biased toward the rotating shaft 170 by the compression spring 200 supported on the side of the base frame 110 has a structure that is installed in a state supported on the guide member 190 to enable elastic horizontal movement.

As shown in FIG. 1, the cam curve portion 161 of the cam member 160 has a protrusion 182 of the cam follower member 180 as shown in FIG. 1. Contact the cam follower member 180 toward the side of the base frame 110, so that the lead screw portion 171 of the rotating shaft 170 and the screw portion 181 of the cam follower member 180 The state is spaced apart by a predetermined distance.

When the driving motor 150 is driven by applying power in the initial state of the operation, the cam member 160 and the rotating shaft 170 coupled coaxially to the output shaft 151 of the driving motor 150 are Rotation is made to rotate the turntable 10. Subsequently, when the contact between the cam curve portion 161 and the protrusion 182 of the cam follower member 180 is released by the rotation of the cam member 160, the elastic spring of the compression spring 200 As the cam follower member 180 is biased toward the rotation shaft 170 and horizontally moved, the threaded portion 181 of the cam follower member 180 is engaged with the lead screw portion 171 of the rotation shaft 170.

As such, when the lead shaft portion 171 of the rotary shaft 170 and the screw portion 181 of the cam follower member 180 are engaged with each other, the rotary shaft 170 is continuously rotated. By the action of the lead screw portion 171 which is provided in a flowable state with the threaded portion 181, the rotary shaft 170 is rotated and at the same time raised. At this time, the stroke in which the rotating shaft 170 is raised is of course determined according to the length of the radius of the cam member 180 is rotated. That is, according to a state in which the cam curved portion 161 of the cam member 160 and the protruding portion 182 of the cam follower member 180 are in contact with each other, the screw portion 181 of the cam follower member 180 is rotated by the rotation shaft ( The cam follower member 171 of the cam member 160 is in contact with or spaced apart from each other, so that the cam follower member 161 of the cam member 160 and the protrusion 182 of the cam follower member 180 are in contact with each other. The screw portion 181 of the 180 is engaged with the lead screw portion 171 of the rotation shaft 170 so that the turntable 10 rotates and rises at the same time. On the other hand, in a state where the cam curved portion 161 of the cam member 160 and the protrusion 182 of the cam follower member 180 are released from contact, the screw portion 181 of the cam follower member 180 is Since the turn screw 10 is spaced apart from the lead screw portion 171 of the rotary shaft 170, the turntable 10 is lowered by the weight of the driving motor 150 coupled to the lower rotary shaft 170, the tensile force of the tension spring 140, etc. Only rotary drive will be made.

Therefore, according to the microwave turntable driving apparatus according to the present invention, the rotation and lifting driving of the turntable 10 may be simultaneously performed by driving the driving motor 150.

In the microwave turntable driving apparatus according to the present invention, although not shown in the drawing, the bracket member 120 and the base frame 110 may be used to smoothly operate the turntable 10 when the turntable 10 is raised or lowered. A damping means (not shown) is installed between the bottom of the cam face and between the side of the cam follower member 180 and the base frame 110, and the bracket member 120 and its guide member 130 and the cam. It is preferable to provide, for example, a bearing member such as a flat bearing or an air bearing between the follower member 180 and the guide member 190.

As another embodiment of the microwave turntable driving apparatus according to the present invention, the lead screw portion of the rotating shaft may be formed of a worm, and the screw portion of the cam follower member may have a worm gear formed to engage the worm.

As described above, according to the microwave turntable driving apparatus according to the present invention, the turntable can be rotated and lifted and driven by a single driving motor, thereby achieving stability of operation, reduction of manufacturing cost, and improvement of productivity by simplifying the configuration. can do.

Claims (10)

A bracket member 120 installed on the base frame 110 attached to the microwave cooking chamber bottom plate 100 to be elastically moved in one direction to allow elastic lifting and moving; A drive motor 150 installed to be mounted on the bracket member 120; A cam member 160 coupled to the output shaft 151 of the drive motor 150 and rotated; A rotating shaft 170 having a lead screw portion 171 provided to extend with the output shaft 151 of the driving motor 150, and having an end portion coupled to a center of the turntable 10 positioned inside the cooking chamber; The screw portion 181 is elastically biased in one direction to the base frame 110 to allow elastic horizontal movement by contact with the cam member 160, and is selectively engaged with the lead screw portion 171 by the horizontal movement. Turntable drive device of the microwave, characterized in that it comprises a cam follower member 180 provided. The method of claim 1, The bracket member 120 is a microwave turntable driving apparatus, characterized in that the elastic lifting movement is guided by the guide member (130, 130) installed in the base frame (110). The method according to claim 1 or 2, The bracket member 120 is a microwave turntable driving apparatus characterized in that the elastic spring is installed in one direction by the tension spring 140 installed in the base frame (110). The method of claim 1, The cam follower member 180 is a microwave turntable driving device, characterized in that the elastic horizontal movement is guided by the guide member 190 installed in the base frame (110). The method according to claim 1 or 4, The cam follower member (180) is a microwave turntable driving apparatus, characterized in that it is installed to elastically bias in one direction by a compression spring (200) installed in the base frame (110). The method of claim 1, The lead screw portion 171 of the rotating shaft 170 is formed of a worm, the screw portion 181 of the cam follower member 180 is a microwave turntable driving device, characterized in that consisting of a worm gear formed to engage the worm. . The method of claim 1, Microwave turntable driving apparatus characterized in that the damping means is provided between the bracket member 120 and the base frame (110). The method of claim 1, Microwave turntable driving device characterized in that the damping means is provided between the cam follower member (180) and the base frame (110). The method of claim 1, Microwave turntable driving apparatus characterized in that the bearing member is provided between the bracket member 120 and the guide member (130, 130). The method of claim 1, Microwave turntable driving device characterized in that the bearing member is provided between the cam follower member 180 and the guide member (190) (190).