JPH0320653Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial field) The present invention relates to a temperature control device for a heating cooker such as an electric oven.

(Prior art) Conventionally, as a temperature control device of this type, a thermostat inserted into the back plate of the inner case can be remotely controlled from a control panel provided on the front cover. It is known from Publication No. 2814.

(Problems to be solved by the invention) In the above-mentioned conventional technology, the temperature control dial and the thermostat operation part are connected by a link mechanism, so the temperature setting error may occur due to loosening of the connection screw or crushing at the end of rotation of the temperature setting dial. The problem was that it was easy to cause

Therefore, in order to solve this problem, the applicant wound the operating roller for temperature adjustment and the driven roller for operating the thermostat with a belt, and applied tension to the belt using a guide pulley. It is proposed that it was made in the first application.

By the way, when the pulley that applies tension to the belt is made of metal, it is necessary to apply a lubricant such as molybdenum disulfide to reduce the frictional resistance between the pulley and the mounting plate surface when the pulley rotates. This requires the unsanitary and troublesome work of applying lubricant, and if the lubricant gets on the belt, the frictional force between the belt and pulley decreases, preventing the pulley from rotating. Therefore, it is expected that temperature setting errors will easily occur.

The present invention was created in consideration of the above circumstances, and is a heating cooker that can obtain smooth rotation of the pulley without using lubricant and can accurately transmit the rotation of the temperature control dial to the thermostat. The purpose of the present invention is to provide a temperature control device.

[Structure of the invention] (Means for solving the problem) The temperature adjustment device for a heating cooker of the invention includes an operating roller 1 that can rotate integrally with a temperature adjustment dial 16.
7 and a driven roller 20 for varying the temperature setting of the thermostat 11 are wrapped around each other by a metal belt 21, and a pulley rotatably supported near both rollers 17 and 20 and applying tension to the belt 21 is provided. 2
Among the pulleys 2 and 23, at least the pulley 22 on the operating roller 17 side is formed of heat-resistant resin, and a rotation guide portion 29 such as an uneven surface is provided on the mounting plate 19 side of the pulley 22.

(Function) When the rotation of the operating roller 17, which rotates integrally with the temperature control dial 16, is transmitted to the driven roller 20 by the metal belt 21, the pulley 22 formed of heat-resistant resin is smoothly rotated by the rotation guide part 29. The rotation of the temperature control dial 16 is accurately transmitted to the thermostat 11.

(Example) Hereinafter, an example of the present invention will be described with reference to the accompanying drawings.

1 and 2 show an electric oven, in which an outer case 1 is placed over an inner case 2, and a heating cooking chamber 3 is formed within the inner case 2. FIG. An upper heater 4 and a lower heater 5, such as a sheathed heater, are installed in the upper and lower parts of the inner case 2.
are attached, and the ends 4a of both heaters 4, 5,
5a are provided to protrude from the outside of the inner case 2, respectively.
A metal receiving shelf 6 is removably attached to the left and right side plates 2a in the inner case 2 through the locking pieces 6a and the grooves 2b of the side plates 2a, and the metal receiving shelf 6 is mounted on the flange portion 6b of the receiving shelf 6. A stand 7 is removably mounted. A metal front frame 8 is provided on the front of the outer case 1.
An opening door 9 covering the front opening of the heating cooking chamber 3 is attached so as to be openable and closable. An operation unit mounting plate 10 is installed horizontally at the lower front of the outer case 1.

As shown in FIGS. 3 to 5, a metal expansion-type interlocking thermostat 11, for example, is attached to the inner part of the side plate 2a of the inner case 2. This thermostat 11 is integrally formed of metals with different coefficients of linear expansion, such as a combination of a stainless steel pipe with a large coefficient of linear expansion and amber with a small coefficient of linear expansion, and has an actuating piece 12a that transmits the difference in expansion between the two. The switch section 13 includes a cylindrical heat-sensitive element part 12 and a switch part 13 provided at the base of the heat-sensitive element part 12 and having a quick-acting contact mechanism operated by the heat-sensitive element part 12. This switch part 13 has a fixed contact 13a and a movable contact 1.
3b, a fixed piece 13c to which both contacts 13a and 13b are attached, and a folded movable piece 13d.
and a leaf spring 13e that presses the movable piece 13d, and is configured to turn on and off the power to the upper heater 4 and the lower heater 5 by opening and closing the switch section 13. And the movable piece 13
A variable temperature setting shaft 13g having a male threaded portion 13f is abutted on the outside of d, and this variable temperature setting shaft 13g is screwed onto the mounting plate 11a of the thermostat 11. A thermostat 11b is attached to an inward convex wall 2c formed on the side plate 2a of the inner case 2 via a mounting plate 11a, and a heat-sensitive element 12 of the thermostat 11 is attached to the convex wall 2c. 2c projects to the back side of the heating cooking chamber 3.

A display window 14 is provided on one side of the operation unit mounting plate 10.
On the inside of this display window 14, there is a plastic temperature control dial 16 connected to a display drum section 15 on which the cooking name, cooking heating temperature, etc. are written, and a part of it is connected to the operation panel of the operation section mounting plate 10. It is horizontally installed so as to protrude from 10a and can be rotated from the outside. This temperature control dial 16
An actuating roller 17 is coaxially connected to one side of the actuating roller 17 via an actuating shaft (not shown). Mounting plate 19 fixed by 18
The side part 15a of the display drum part 15 is pivoted to a bent support plate 10c formed near the center of the operation part mounting plate 10, and the temperature adjustment dial 16 and the display drum part 15 are integrally provided so as to be rotatable.

A driven roller 20 constituting a temperature setting section is fixed to the end of the temperature setting variable shaft 13g,
A thin and flexible plate belt 21 made of stainless steel or the like is wound between the driven roller 20 and the driven roller 17 as a connecting body. Furthermore, the rotation center of the actuating roller 17 and the driven roller 20
A first pulley 22 for guiding the plate belt 21 is provided near the actuating roller 17 at a position forward of the straight line O-O connecting the rotation center with the plate belt 21, so that the wrapping range A of the actuating roller 17 of the plate belt 21 is 180°. It's bigger. Similarly, a second pulley 23 for guiding is provided near the driven roller 20, so that the wrapping range B of the driven roller 20 is 180 degrees or more. The lower part of the plate belt 21 is fixed to the actuating roller 17 with a screw 24, and this fixing point remains within the winding range A even when the temperature control dial 16 is at the maximum rotational position a or the minimum rotational position b.
It is formed to be within. Similarly, the upper part of the plate belt 21 and the fixing screw 25 of the driven roller 20 are located within the winding range B, with the maximum a' and the minimum b'. A belt spring 26, which is an elastic body, is provided on the plate belt 21 approximately in the middle between the actuating roller 17 and the driven roller 20, and the belt spring 26 is configured to apply tension to the plate belt 21. . This belt spring 26 has a spring plate 2 extending along the longitudinal direction of the plate belt 21 at the attachment base end 26a.
6b, and a front abutting surface portion 26c to the front surface of the plate belt 21 connected to the tip of the spring plate 26b.
and a rear contact surface portion 26d provided at a distance from this front contact surface portion 26c to the rear rear surface of the plate belt 21.
An arc-shaped introduction plate part 26e is connected to the lower part of the front contact surface part 26c, and a restraining piece 26f is arranged at a distance behind the corresponding contact surface part 26d.

The first pulley 22 and the second pulley 23 are made of thermosetting heat-resistant resin such as phenolic resin, and the first pulley 22 is attached to the lower part 19b of the mounting plate, and the second pulley 23 is attached to the upper part 19c of the mounting plate.
Each is rotatably supported on a shaft. In this case, as shown in FIG. 6, through holes 22a and 23a are formed in both pulleys 22 and 23 along their axes, and a stepped groove 22 is formed in the head of each pulley.
b, 23b are formed. And screw 2
7 and 28 are screwed onto the mounting plates 19b and 19c inserted into the through holes 22a and 23a, respectively, to rotatably support both pulleys 22 and 23. Further, a convex rotation guide portion 29 is formed at the contact portion of the first pulley 22 with the lower part 19b of the mounting plate, and the second pulley 22
A convex rotation guide portion 30 is formed at the contact portion with the mounting plate upper portion 19c of No. 3. The mounting plate 11a of the thermostat 11 is mounted on a mounting seat 19d provided at the upper end of the upper mounting plate 19c. The lower mounting plate 19b and the mounting plate 19c are integrated by welding or the like to form a thick mounting plate 19, which is attached to the side plate 2a. Also, the plate belt 21 is attached to the mounting plate 19.
A protective wall 31 is erected around the body so that movement is not obstructed by an electric cord (not shown) or the like. Further, a timer 32, a manual changeover switch 33 for the lower heater 5, and a power indicator lamp 34 are mounted on the operation unit mounting plate 10.

In the above configuration, when cooking gratin, cake, etc. at high temperature, first switch the manual changeover switch 3.
3, and turn the temperature control dial 16 to set it to, for example, 250°C or 160°C. By operating the temperature adjustment dial 16, the plate belt 21 is also moved guided by the rotation of the first and second pulleys 22, 23, and the driven roller 20 is rotated. With this rotation, the temperature setting variable shaft 13g retreats outward by the male screw portion 13f, and the movable piece 13 of the leaf spring 13e
The pressing force on d becomes smaller. In this case, when the temperature control dial 16 is turned to rotate the driven roller 20 via the plate belt 21, the tension of the belt spring 26 is applied to the plate belt 21. Next, when the timer 32 is set to a desired time, for example 10 minutes or 30 minutes, the power indicator lamp 34 lights up, and if the heating cooking chamber 3 is below the set temperature, the actuating piece 12a of the temperature sensing element section 12 changes to the movable piece 13d. is pressed outward, the fixed contact 13a and the movable contact 13b come into contact with each other, and the upper heater 4 and the lower heater 5 are energized to heat the cooking chamber 3. When the heating cooking chamber 3 reaches a set temperature or higher, the fixed contact 13a and the movable contact 13b are separated by the temperature sensing element section 12, and the upper heater 4
and repeating power supply and stop to the lower heater 5,
The set temperature is maintained until the time set by the timer 32.
In addition, when heating a pie or the like at a relatively high temperature for a short period of time, such as lightly browning, open the manual selector switch 33, turn the temperature control dial 16, and set the temperature to, for example, 250°C. However, when the timer 32 is set to about 3 minutes, the upper heater 4 whose temperature is controlled by the thermostat 11
The cooking chamber 3 is heated to a predetermined temperature.

In this way, according to the above embodiment, the operating roller 17 of the temperature control dial 16 and the thermostat 11
By wrapping the plate belt 21 between the driven rollers 20 fixed to the temperature variable shaft 13g, the actuating roller 17 and the driven roller 20 are linked to each other on the same side plate 2a surface, which eliminates error factors such as backlash and ensures accuracy. Temperature setting operations can be performed. Further, by providing the first and second pulleys 22 and 23, the winding range A of the plate belt 21 of the actuating roller 17 and the plate belt 21 of the driven roller 20 are
Range B can be expanded to 180℃ or more for each wrapping.
By increasing the rotation angle of the temperature adjustment dial 16, the temperature scale on the display drum section 15 can be displayed finely. In this case, the first and second pulleys 22 and 23 are molded from heat-resistant resin, and convex rotation guide portions 29 and 30 are formed in the contact portions with the mounting plates 19b and 19c. Pulley 2
The inner circumferential walls of the through holes 22a, 23a, which are the contact parts between the pulleys 2, 23 and the screws 27, 28, are smooth surfaces, and the contact parts between the pulleys 22, 23 and the mounting plates 19b, 19c are the convex rotation guide parts 29, 30 reduces the contact area, which makes both pulleys 22, 2
The frictional resistance during rotation of 3 is small, and the pulleys 22, 2
3 can rotate smoothly. This eliminates the need for unsanitary and complicated lubricant application work, and eliminates the problem of lubricant adhering to the plate belt 21 and interfering with the rotation of the pulleys 22 and 23. In addition, since the heat-resistant resin pulleys 22 and 23 have a higher coefficient of thermal expansion than metal pulleys, the plate belt 2 This increases the friction between the two pulleys 22 and 23, and the rotation of the temperature control dial 16 is accurately transmitted to the thermostat 11. In addition, heat-resistant resin pulleys 22, 23
The plate belt 21 is softer than metal pulleys.
wear is suppressed.

7 and 8 show other embodiments of the rotation guide part, and FIG. 7 shows a pulley 2 made of heat-resistant resin.
Stepped grooves 22b, 2 provided in the heads of 2, 23
3b to the mounting plates 19b, 29c of pulleys 22, 23
The rotation guide portions 29a, 30 are also provided on the contact surface side with the
a, and these rotation guide parts 29a, 30
a reduces the contact area with the mounting plates 19b and 19c. In this case, the direction in which both pulleys 22 and 23 are assembled can be freely selected. Further, in FIG. 8, tapered grooves are provided on the sides of the mounting plates 19b and 19c of the pulleys 22 and 23 to form rotation guide parts 29b and 30b.
The contact area with 9b and 19c is made small.

9 and 10 show the manufacturing order of the front frame 8 and the receiving shelf 6. First, a single metal plate is made, and the front frame and the pair of receiving shelves are connected by a part of the connecting part 35. Die-cut in one piece to form a blank.
Next, drawing and bending are performed to form the front frame 8 into a U-shaped cross section, and at the same time, a locking piece 6a, a flange portion 6b, etc. are formed on the receiving shelf 6 as shown in FIG. Thereafter, the front frame 8 and the receiving shelf 6 are plated with NiCr or the like while being integral, and the connecting portion 35 is cut to form the front frame 8 and the receiving shelf 6 as shown in FIG. In addition, when using a stainless steel plate, plating treatment may not be performed.

In this way, the front frame 8 and the receiving shelf 6 are made from a single metal plate.
Since the front frame 8 and the receiver are integrally formed while remaining continuous at the connecting portion 35, scratches on the receiver shelf 6 that occur when the receiver shelf 6 is formed from the waste material of the front frame 8, for example, are removed, and the front frame 8 and the receiver shelf are formed integrally. 6 and 6 are eliminated. Further, the amount of material can be reduced compared to the case where the front frame 8 and the receiving shelf 6 are formed from two metal plates.

Note that the present invention is not limited to the above-mentioned embodiments, and various modifications can be made within the scope of the gist of the present invention. For example, the heat-resistant resin pulley may be provided at least on the actuating roller side. Further, the rotation guide portion may have a structure that reduces the contact area between the pulley and the mounting plate, such as by providing linear or dotted unevenness.

[Effects of the invention] The invention makes it possible to adjust the temperature by forming the pulley made of heat-resistant resin to guide the belt that wraps around the actuating roller and the driven roller, and by providing a rotation guide on the mounting plate side. It is possible to provide a temperature control device for a heating cooker that can accurately transmit the rotation of a dial to a thermostat.

[Brief explanation of the drawing]

Figures 1 to 6 show an embodiment of the present invention, with Figure 1 being an overall perspective view of the heating cooker showing the inner case side, Figure 2 being an overall perspective view of the heating cooker, and Figure 3 being an overall perspective view of the heating cooker. 4 is a perspective view of the same essential parts showing the operating roller and display drum side; FIG. 5 is a perspective view of the same essential parts showing the driven roller and thermostat side; Figure 6 is a cross-sectional view of the guide pulley, Figures 7 and 8 are cross-sectional views of the guide pulley showing other embodiments, and Figures 9 and 10 are the processing order of the front frame and the receiving shelf. FIG. 11... Thermostat, 16... Temperature adjustment dial, 17... Operating roller, 19b, 19...
Mounting plate, 20...driven roller, 21...belt,
22, 23...Pulley, 29, 29a, 29b,
30, 30a, 30b...Rotation guide section.

Claims (1)

[Scope of utility model registration request] An actuating roller that can rotate integrally with the temperature adjustment dial, a driven roller for varying the temperature setting of the thermostat that is wrapped around the actuating roller by a metal belt, and a rotatably supported shaft near both rollers. a guiding pulley for applying tension to the belt, at least one of the pulleys on the operating roller side is made of heat-resistant resin, and a rotation guide part such as an uneven surface is provided on the mounting plate side of the pulley. A temperature control device for a heating cooker, comprising: