JPS63217150A - Weight detector of heat-cooking apparatus - Google Patents

Abstract

PURPOSE:To detect positively and accurately the weight of a material to be heated by generating a non-charge state to be supported and slid by the crest part of a cam upon the rotation of a rotary shaft, and a charge state to be set free at the root part of the cam, and detecting the difference in the weights between both states by a weight detector. CONSTITUTION:When the driven shaft of a rotary table 3 is driven by a motor 9, a pin member 16 moves on a cam member 15. When the pin member 16 is in a root part 15a, the lower end surface of the driven shaft 5 is supported by cantilevers 11a and 11b via a steel ball 17 and the deflection thereof is detected as a weight by strain gages 18-18d. Then, when the pin member 16 shifts to the crest part of the cam, the driven shaft 5 float up from the steel ball 17 and slides on the cam surface, and outputs from strain gates 18a-18d become 0. Thus, the difference in weight between the non-charge state and the charge state is detected by a weight detector consisting of strain gages. Thus, the weight of the material to be heated can be detected positively and accurately and the zero value setting of the initial weight is not required to improve the workability of the device.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a weight detection device for detecting the weight of food placed on a rotating table of a heating cooker.

(Prior Art) In general, in a heating cooker (1) such as a microwave oven as shown in FIG. 4, the object to be heated is placed in a heating chamber (2 ) to uniformly irradiate the heated object with high-frequency energy. Conventionally, in order to detect the weight of the heated object, in order to detect the weight of the heated object, Rollers that drive the rotary table (3) are arranged at multiple locations in the circumferential direction below the rotary table (3) on the bottom surface (4) of the chamber, and strain gauges are provided below these rollers to detect the weight of the object to be heated. That's what I do.

[Problems to be Solved by the Invention] However, as described above, the strain gauge that detects the weight of the heated object drifts due to changes in temperature and humidity; There is a drawback that value setting is required and the correction operation is troublesome.

In view of the above points, it is an object of the present invention to provide a weight detection device for a heating cooker that does not require setting the initial weight to a "zero" value, is easy to use, and is capable of reliably detecting the weight of an object to be heated. .

c) Means for Solving the Problem) The weight detection device for a heating cooker of the present invention is provided with a cam that engages with the rotating shaft around the rotating shaft of the rotating table in the heating chamber, and detects the rotation of the rotating shaft. Occasionally, generating a non-load state in which the rotation shaft is supported and slid on the peaks of the cam and a load state in which the rotation shaft is free in the valleys of the cam,
The weight difference between the non-loaded state and the loaded state is detected by a weight detector.

[Effect]

In the present invention, the weight of the object to be heated can be reliably and accurately detected by detecting the weight difference between the non-loaded state and the loaded state, and it becomes possible to eliminate the need to set the initial weight to a "zero" value.

〔Example〕

Hereinafter, parts that are the same as those in Figure 4 are designated by the same reference numerals.
The present invention will be described with reference to an embodiment shown in FIGS. In the figure, (5) is a drive shaft made of ceramic that is disposed through the center of the bottom (4) of the heating chamber (2) so as to be able to move in the axial direction. 3) is placed, and its heating chamber (
A spline tooth (5a) is formed in the center of the downward protruding part from 2), and the motor (8) is connected to the motor ( 9) is connected to the output shaft.

Thus, (10) is a mounting plate fixed to the lower surface of the heating chamber (2), and on the lower surface of the - side thereof, there is a pair of upper and lower cantilevers (lla) fixed in a cantilevered manner by screws (12).
(llb) are arranged and fixed to face each other at a predetermined distance apart, and a hole (IQa) through which the drive shaft (5) passes is formed in the other side. The above cantilever (l
la), (llb) have screws (1
3) to which the casing (9a) of the motor (9) is fixed, and through bearing members (14a) and (14b) respectively mounted on the upper and lower outer surfaces of the casing (9a),
The drive shaft (5), which is disposed through the upper cantilever (lla), is supported so as to be movable in the axial direction. (1
5) is a ring-shaped cam member provided around the hole (10a) of the mounting plate (10), and (16) is the drive shaft (5).
The cam member (
The pin member (17) slides on the cam surface of the lower cantilever (llb), and is a steel ball disposed at a position facing the lower end surface of the drive shaft (5) of the lower cantilever (llb). )
is supported by the lower cantilever (llb) via the steel ball (17) only when the pin member (16) is in the trough (15a) of the cam member (15), and the pin member (16) When the cam member (15) is at the peak (15b), it floats above the steel ball (17) and the cam member (15) floats above the steel ball (17).
5) and is supported by the mounting plate (lO). (18a) and (18b) are strain gauges attached to the lower surface of the upper cantilever (lla);
(18c) and (18d) are the lower cantilever (l
lb) A strain gauge attached to the top surface, each of these gauges is connected in a bridge shape and the load applied via the steel ball (17) is detected as a change in the electrical resistance of the gauge. (19) are the upper and lower cantilevers (lla), (l
lb) and is fixed to the mounting plate (10) via the screws (12).

In the device of the present invention configured as described above, when the drive shaft (5) is driven by the motor (9), the pin member (1
6) moves along the cam surface of the cam member (15). At this time, the pin member (16) is attached to the trough (
15a), as shown in Figure 2, the drive! 1Ik
(5) has its lower end surface in contact with the steel ball (17), and the steel ball (17) is in contact with the steel ball (17).
17) via cantilever (lla), (ll
b) supported by these cantilevers (LLa),
(llb) is deflected. At this time, the pin member (16) passes through the trough (15a) while floating above the cam surface. The deflection is caused by the strain gauge (18a), (
18b), (18c), and (18d), and the weight is detected.

Further, the pin member (16) is connected to the peak portion (1) of the cam member (15).
5b), it engages with this peak (15b) and slides on the cam surface with the drive shaft (5) floating above the steel ball as shown in FIG. At this time, strain gauges (18a), (18b), (18c), (
18d) shows no change in electrical resistance and is not output. In this way, the weight sensing device according to the present invention has a drive shaft (
5) Since a loaded state and a non-loaded state are generated during rotation, and the weight difference between these is detected, it is not necessary to set the initial weight to a "zero" value during use, and operability can be improved.

In addition, in the above embodiment, the cam member (15) is connected to the drive shaft (5).
Although the cam member is provided near the rotary plate (6) and is engaged with the bin member (16) extending horizontally from the drive shaft (5), the present invention is not limited to this. Alternatively, it may be arranged below the periphery of the rotary table (3), and a protrusion that engages with the peak of the lower cam member may be provided hanging down on the rotary plate (6) or the rotary table (3) side. Even in such a case, the same effects as in the above embodiment can be achieved.

Further, the weight detector is not limited to the strain gauge, and may be replaced with other detection means using a spring or the like.

〔Effect of the invention〕

As described above, according to the present invention, since the weight detector is configured to detect the weight difference between the non-loaded state and the loaded state, the weight of the object to be heated can be reliably and accurately detected, and the initial This has the effect that it is possible to improve operability by eliminating the need to set the weight to a "zero" value.

[Brief explanation of the drawing]

Fig. 1 is a fragmented perspective view of a part of an embodiment of the device of the present invention, Fig. 2 is a sectional view showing a state in which a weight detector is loaded, and Fig. 3 is a state in which no load is applied to the weight detector. Second
FIG. 4 is a perspective view showing the appearance of a conventional heating cooker. (1)...Heating cooker, (2)...Heating chamber, (3)...Rotary table, (5)...Drive shaft (rotating shaft), (15)...Cam member, (15a)... Valley portion of cam member, (15b)... Peak portion of cam member, (18a), (18b), (18c), (
18d) - Strain gauge (weight detector). In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] A cam that engages with the rotating shaft is provided around the rotating shaft of the rotating table in the heating chamber, and when the rotating shaft is rotated, the rotating shaft is supported and slid on the peak of the cam; The weight of the heating cooker, characterized in that a loaded state is generated in the valley of the cam to free the rotating shaft, and a weight difference between the non-loaded state and the loaded state is detected by a weight detector. Detection device.