JPH046793A - Heating cooking device - Google Patents

Abstract

PURPOSE:To prevent any alternately up and down force from acting on an arm supporter and a driving axis by forming the rolling contact surface of each roller into a spherical surface with the same radius dimension as that of the roller. CONSTITUTION:Since the outer peripheral surface 21a of each roller 21 is formed into a spherical surface with the radius dimension r which is the same as the radius dimension y of the roller 21, even if a rotary arm 19 inclines to make the roller 21 incline outward or inward, a contact point of the roller 21 Q1 to a wavelike surface 15 and the contact point Q2 of the same roller 21 to a turntable 22 lie in a common vertical line s, therefore both contact points Q1 and Q2 cannot shift in the radial direction. As a result, the alternately up and down force acting on an arm supporter 16 and a driving axis 13 can be canceled.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention (Industrial Field of Application) The present invention relates to a heating cooker that heats an object to be heated while moving it up and down and rotating it in a heating cooking chamber.

(Conventional technology) A microwave oven is known as this type of heating cooker.

In this microwave oven, as shown in FIG. 5, a drive shaft 3 is disposed at the bottom 2 of the cooking chamber 1.
A ring member 5 having a wavy surface portion 4 formed on its upper surface is disposed concentrically with the drive shaft 3. A plurality of arm supports 6 are attached to the drive shaft 3 via boss portions 6a so as to rotate together with the drive shaft 3. Furthermore, a rotary arm 7 is connected to each tip of the arm support 6 so as to be vertically movable and rotate integrally with the arm support 6, and a roller 8 is attached to each tip of the rotary arm 7. is rotatably supported. This roller 8 has the wavy surface portion 4
It is located above.

A turntable 9 is arranged on each roller 8, and a food to be heated is placed on this turntable 9.

When the drive shaft 3 is driven to rotate, the arm support 6 and the rotary arm 7 are rotated together with the drive shaft 3, and the roller 8 rolls on the corrugated surface portion 4 accordingly. Due to this rolling, the turntable 9 rotates while moving up and down, and the food to be heated is heated and cooked while being rotated and moved up and down.

(Problems to be Solved by the Invention) By the way, in the conventional structure described above, when the roller 8 rolls on the wavy surface portion 4, the roller 8 moves up and down along the wavy surface portion 4, but in this case, the rotating arm 7 also rotates up and down. As a result, the support shaft 7a of the rotary arm 7 is tilted, and the roller 8 is also tilted.

However, when the roller 8 reaches the bottom of the corrugated surface portion 4, the roller 8 inclines outward, and when it reaches the top, it inclines inward. As shown in FIG. 5, for example, when the roller 8 is at the lowest position of the corrugated surface portion 4 and is inclined outward, the contact point P1 of the roller 8 with respect to the corrugated surface portion 4 will be The contact point P2 with respect to the turntable 9 at 8 is shifted outward in the radial direction. As a result, a rotational force is generated against the roller 8 on which the weight of the turntable 9 and the food to be heated is applied from above, as shown by arrow A in the figure, and as a result, the rotational force of the rotating arm 7 with the arm support 6 is generated. The upward force on the part 7b side (
(indicated by arrow B), and accordingly, the arm support 6 receives a force in the direction of pulling out from the drive shaft 3.

Conversely, when the roller 8 is at the top of the wavy surface portion 4 and is inclined inward, the upper contact point P2 is sequentially shifted inward relative to the lower contact point P1, Contrary to the above, the connecting portion 7b of the rotating arm 7 receives a downward force. In this way, vertical forces are applied alternately to the arm support 6, which may loosen the connection between the drive shaft 3 and the arm support 6, which may lead to the arm support 6 coming off the drive shaft 3. Ta. Furthermore, since the vertical force acts alternately on the drive shaft 3, it also has an adverse effect on the bearings of the drive shaft.

The present invention has been made in view of the above circumstances, and its object is to eliminate alternating vertical forces from acting on the arm support and the drive shaft, and to improve the relationship between the drive shaft and the arm support. To provide a heating cooker which does not cause the connection of the parts to become loose and which does not adversely affect the bearings of the drive shaft.

[Structure of the Invention (Means for Solving the Problems)] The present invention includes a drive shaft located at the bottom of a heating cooking chamber and provided to be rotated, and a drive shaft provided on the upper surface of the bottom of the heating cooking chamber. a wavy surface portion provided concentrically with the shaft; an arm support attached to the drive shaft; and a pivot supported to be vertically movable relative to the arm support and integrated with the drive shaft via the arm support. multiple rotating arms that rotate,
A roller that is pivotally supported at the tip of each rotating arm and rolls on the wavy surface portion, and a turntable that is placed on each roller and rotates while moving up and down based on the rolling of the roller. , the rolling surface of each of the rollers is formed into a spherical shape with the same radius as that of the roller.

(Function) According to the above means, since the rolling surface of each roller is formed into a spherical shape with the same radius dimension as that of the roller,
Even when the rotary arm is tilted and the roller is tilted outward or inward, the contact point of the roller with the wavy surface and the contact point of the roller with the turntable are located on a common vertical line, so that both contact points are maintained. There is no possibility that the points will shift in the radial direction. As a result, no alternating vertical forces are applied to the arm support and the drive shaft, and the connection between the drive shaft and the arm support does not become loose. There is no adverse effect on bearings, etc.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

First, in FIG. 4, 11 is the microwave oven main body,
A heating cooking chamber 12 is formed inside.

Although not shown, the microwave oven main body 11 is equipped with a magnetron or the like, and the food to be heated in the heating cooking chamber 12 is heated by this magnetron. As shown in FIG. 1, a drive shaft 13 is disposed in the bottom 12a of the heating cooking chamber 12, passing through the hole 12b. ing. Therefore, the drive shaft 13 is rotationally driven by the drive of the motor.

Reference numeral 14 denotes a ring member having a wavy surface portion 15 formed on its upper surface, and this ring member is arranged and fixed on the bottom portion 12a concentrically with the drive shaft 13. Reference numeral 16 denotes an arm support body, which is composed of a boss portion 17 and three pivot arm portions 18 extending radially from the boss portion 17. The boss portion 17 of the arm support 16 is attached to the drive shaft 13, so that the arm support 16 rotates integrally with the drive shaft 13.

A rotary arm 19 is connected via a shaft 20 to the tip of each pivot arm portion 18 in the arm support 16 so as to be movable up and down. A shaft portion 19a is formed at the tip of each rotating arm 19, and a roller 2 is attached to this shaft portion 19a.
1 is rotatably provided. The roller 21 is placed on the corrugated surface portion 15, and a turntable 22 is placed on the roller 21.

A food to be heated and cooked is placed on this turntable 22 .

Now, as shown in FIG. 1, when the radial dimension of the roller 21 is y, the outer circumferential surface 21a as its rolling surface is formed into a spherical shape with a radial dimension r that is the same as the radial dimension y. .

In the above configuration, when the drive shaft 13 is rotationally driven, the arm support 16 and one rotary arm are rotated together with the drive shaft 13, and the roller 21 rolls on the corrugated surface portion 15 accordingly. Due to this rolling, the turntable 22 rotates while moving up and down, and the food to be heated is heated and cooked while being rotated and moved up and down.

As described above, when the roller 21 rolls on the wavy surface portion 15, the roller 21 moves up and down along the wavy surface portion 15;
In this case, the rotating arm 19 rotates up and down. As a result, the support shaft 19a of the roller 21 is tilted, and the roller 21 is also tilted.

However, as shown in FIG. 2, when the roller 21 reaches the lowest point of the corrugated surface portion 15, the rotary arm 19 tilts downward and the roller 21 tilts outward, and as shown in FIG. When reaching the upper position, the rotary arm 19 tilts upward and the rollers 21 tilt inward.

However, according to this embodiment, the outer circumferential surface 21a, which is the rolling surface of each roller 21, is formed into a spherical shape with the radius dimension r being the same as the radius dimension y of the roller 21. Even when the rotary arm 19 is tilted and the roller 21 is tilted outward or inward, as shown in FIGS.
The contact point Q2 for the second contact point Q2 is now located on the common vertical line S, so that the two contact points Ql and Q2 will not be displaced in the radial direction. As a result, it is possible to eliminate alternating vertical forces from acting on the arm support 16 and the drive shaft 13. Therefore, the connection between the drive shaft 13 and the arm support 16 can be prevented from becoming loose, and the arm support 16 can also be prevented from coming off from the drive shaft 13. It is possible to avoid any negative effects.

[Effects of the Invention] As is clear from the above description, the present invention includes a drive shaft that is located at the bottom of the cooking chamber and is rotatably driven, and a drive shaft that is provided on the upper surface of the bottom of the cooking chamber. an arm support attached to the drive shaft; a plurality of rotating arms that rotate, a roller that is pivotally supported at the tip of each rotating arm and rolls on the wavy surface portion, and a roller that is arranged on each roller and rotates while moving up and down based on the rolling of the roller. In a device equipped with a turntable that
The rolling surface of each of the rollers is formed into a spherical shape with the same radius as that of the roller. This has the excellent effect of eliminating the application of vertical force, preventing the connection between the drive shaft and the arm support from becoming loose, and having no adverse effects on the drive shaft bearings, etc. .

[Brief explanation of the drawing]

1 to 4 show an embodiment of the present invention,
FIG. 1 is a longitudinal sectional side view of the main part, FIGS. 2 and 3 are longitudinal sectional side views of the main part for explaining the operation, and FIG. 4 is a partially cutaway perspective view of the microwave oven. FIG. 5 is a diagram corresponding to FIG. 2 showing a conventional example. In the drawing, 12 is a heating cooking chamber, 13 is a drive shaft, 14 is a ring member, 15 is a wavy surface portion, 16 is an arm support, 19 is a rotating arm, 21 is a roller, and 21a is an outer peripheral surface (rolling surface).
shows. Figure 1

Claims (1)

[Claims] 1. A drive shaft located at the bottom of the heating cooking chamber and provided to be rotationally driven; a wavy surface portion provided concentrically with the drive shaft on the upper surface of the bottom of the heating cooking chamber; an attached arm support; a plurality of rotating arms that are pivotally supported to be vertically movable relative to the arm support and rotate integrally with the drive shaft via the arm supports; A roller that is pivotally supported and rolls on the wavy surface portion, and a turntable that is placed on each roller and rotates while moving up and down based on the rolling of the roller. A heating cooking device characterized in that a moving surface is formed into a spherical shape with a radius dimension that is the same as the radius dimension of the roller.