JPH0592659U - Microwave oven weight detector - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a cheap microwave oven by reducing the number of parts of a weight sensor that detects the weight of food, simplifying the work of mounting on a sensor mounting plate. [Structure] A sensor mounting plate 11 is fixed to the lower surface of the bottom plate 1a so as to face the rotation locus of a roller 3b of a turntable support 3 which rotates the upper surface of the bottom plate 1a of a heating chamber 1 of a microwave oven, and a weight detection body is attached. The detection body holder 14 made of synthetic resin, which integrally holds a knob 14a for holding the detection body 12 and applying a pressing force from the roller 3b to the detection body 12, is fixed to the sensor mounting body 11.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a weight detecting device for a microwave oven which automatically detects the weight of food placed on a turntable and controls the heating time of the food by microwaves based on the detected value.

[0002]

[Prior Art]

 Recently, microwave ovens with weight sensors have become popular, which automatically detect the weight of food placed on a turntable and control the thawing time or cooking time according to the detected value.

3 and 4 show a general example of a microwave oven with a weight sensor. In FIG. 3, 1 is a heating chamber, 2 is a turntable on which food is placed, 3 is a support for the turntable 2, and a plurality of arms 3a are radially provided, and a roller 3b is pivotally provided at the tip thereof. It is worn. Then, the support 3 is rotated by stirring the turntable 2 by the operation of the motor 4 attached to the lower surface of the bottom plate 1a of the heating chamber 1, and the roller 3b is on the upper surface of the bottom plate 1a as shown by the alternate long and short dash line in FIG. It rotates on the rotation locus 5.

Reference numeral 6 is a magnetron, 7 is a waveguide, 8 is a cabinet that constitutes the outer shell of a microwave oven, 9 is a door, and 10 is food that is placed on the turntable 2.

Further, WS is a weight sensor provided on the lower surface of the heating chamber 1 opposite to the rotation path 5 on the upper surface of the bottom plate 1 a, and a piezoelectric element is used as a weight detection body.

A conventional weight sensor WS is shown in FIG. In the sensor mounting plate 11 of the weight sensor WS, the opening 11a at the center of the top surface is fitted into the hole formed in the rotation path 5 on the upper surface of the bottom plate 1a of the heating chamber 1, and the periphery of the opening is the lower surface of the bottom plate 1a. Is fixed to (for example, spot welding). Reference numeral 20 is a detection body holder on which the piezoelectric element 12 of the weight detection body is mounted, and 21 is integrally formed with a knob 21a for applying the pressing force of the roller 3b (weight of the food 10) to the piezoelectric element 12 at the center. It is a synthetic resin detection body cover. The detection body holder 20 and the detection body cover 21 are fastened and fixed to the sensor mounting plate 11 by a plurality of screws 22. Reference numeral 13 is an eye-shielding tape that closes a hole formed in the rotation locus 5 of the bottom plate 1a of the heating chamber 1.

Therefore, when the ten table 2 on which the food 10 is placed rotates together with the support body 3 by the operation of the motor 4 and the roller 3b pivotally attached to the arm 3a comes on the blinding tape 13, the detection body cover is formed. The knob 21a of 21 is pressed, the pressing force of the knob 21a is applied to the piezoelectric element 12, and the piezoelectric element 12 generates an output according to the weight of the food 10 to control the thawing time or the cooking time.

[0008]

[Problems to be solved by the device]

 As described above, the conventional weight sensor WS includes the sensor mounting plate 11, the detection body holder 20 on which the piezoelectric element 12 is mounted, the synthetic resin detection body cover 21 integrally formed with the knob 21a, and the screw 22. Therefore, when mounting on the sensor mounting plate 11, the detection body cover 21 is superposed on the detection body holder 20 on which the piezoelectric element 12 is placed, and the piezoelectric element 12 is pressed by the knob 21a. Since it is necessary to fasten them together with the screws 22 (to prevent the piezoelectric element 12 from falling off), the mounting work is troublesome, and the number of parts is large and the cost is increased.

The present invention has been made in view of the above circumstances, and an object thereof is to reduce the number of parts of the weight sensor, simplify the mounting work on the sensor mounting plate, and provide an inexpensive microwave oven.

[0010]

[Means for Solving the Problems]

 According to the present invention, in order to achieve the above object, a sensor mounting plate is fixed to a lower surface of a bottom plate so as to face a rotation locus of a roller of a turntable support that rotates on an upper surface of a bottom plate of a heating chamber of a microwave oven. Then, the weight detection body is held and the detection body holder made of synthetic resin integrally formed with the knob for applying the pressing force from the roller to the detection body is fixed to the sensor mounting body.

[0011]

[Action]

 The knob integrally molded with the synthetic resin detection body holder elastically presses and holds the weight detection body, so the detection body holder constitutes a unit with a built-in weight detection body. For example, even if this unit is inverted, the weight detector does not fall off the holder, and the conventional detector cover is omitted, which reduces the number of parts.

[0012]

【Example】

 An embodiment of a weight sensor WS according to the present invention will be described with reference to the drawings. The same parts as those of the conventional example are designated by the same reference numerals. As shown in FIG. 1, reference numeral 11 denotes a sensor mounting plate, and an opening 11a at the center of the top surface thereof is fitted into a hole formed on a rotation locus 5 of a roller 3b drawn on the upper surface of the bottom plate 1a of the heating chamber 1. The periphery of the opening 11a is fixed to the lower surface of the bottom plate 1a (for example, spot welding). A sensor holder 14 made of synthetic resin for pressing and holding the piezoelectric element 12 of the weight sensor is fastened and fixed to the sensor mounting plate 11 by a plurality of screws 15.

The detection body holder 14 is integrally formed with a knob 14a for pressing and holding the piezoelectric element 12 and receiving a pressing force of the roller 3b (weight of the food 10).

As shown in FIG. 2, the knob 14a is cantilevered integrally from the side peripheral wall of the detection body holder 14 toward the center, and the arm 14a1 and the arm 14a1 are integrally formed. It has a T-shape having an upper protruding portion 14a2 and a lower protruding portion 14a3 at the tip (the upper end surface of the upper protruding portion 14a2 faces the blinding tape 13, and the lower end surface of the lower protruding portion 14a3 is a piezoelectric element). Press the upper surface of 12).

Further, a notch 14b is formed in a part of the side peripheral wall of the detection body holder 14, and the piezoelectric element 12 is inserted from this notch 14b and accommodated in the piezoelectric element receiving portion 14c. In this housed state, the piezoelectric element 12 is held in a fixed state by being slightly pressed by the lower end surface of the lower protruding portion 14a3 of the knob 14a. Therefore, the detector holder 14 constitutes a unit in which the piezoelectric element 12 housed by the knob 14a is held in a fixed state, and the holder 14 may be turned upside down when it is attached to the sensor attachment plate 11 with the screw 15. Also, the piezoelectric element 12 does not fall off.

When the detection body holder 14 is screwed to the sensor mounting plate 11, the upper end surface of the upper protruding portion 14a2 of the knob 14a is 0.2 to 0. By setting the protrusion of about 3 mm, the weight of the food 10 from the roller 3 b is spot-applied to the center of the piezoelectric element 12 and the accuracy of the output generated from the piezoelectric element 12 can be increased.

[0017]

[Effect of the device]

 According to the present invention, since the weight detection body is pressed and held by the detection body holder made of synthetic resin, and the knob for applying the pressing force (food weight) from the roller to the weight detection body is integrally formed, (a) The detector holder constitutes a unit that holds the weight detector in a fixed state, and mounting work on the sensor mounting plate is easy and easy. (B) Since the detector holder also serves as a conventional detector cover, the number of parts is reduced, and an inexpensive microwave oven can be provided.

[Brief description of drawings]

FIG. 1 is a partially cutaway sectional view showing an embodiment of the present invention.

FIG. 2 is a structural explanatory view of a detection body holder.

FIG. 3 is a configuration explanatory view of a general example of a microwave oven with a weight sensor.

FIG. 4 is a diagram showing a rotation trajectory of a roller pivotally attached to a support of a turntable.

FIG. 5 is a partially cutaway sectional view of a microwave oven equipped with a conventional weight sensor.

[Explanation of symbols]

 1 Heating Chamber 2 Turntable 3 Support 3a Arm 3b Roller 10 Food 11 Sensor Mounting Plate 12 Piezoelectric Element 13 Blind Tape 14 Detector Holder 14a Knob 14b Notch 14c Detector Receiver 15 Screw

Claims (1)

[Scope of utility model registration request] 1. A sensor mounting plate is fixed to the lower surface of the bottom plate so as to face the rotation locus of the roller of the turntable support that rotates the upper surface of the bottom plate of the heating chamber of the microwave oven, and to hold the weight detection body. A weight detecting device for a microwave oven, characterized in that a synthetic resin detecting body holder integrally formed with a knob for applying a pressing force from a roller to the detecting body is fixed to the sensor mounting body.