JPS60205319A - Electrostatic capacity type electronic scale - Google Patents

Abstract

PURPOSE:To prevent a load sensor part from contacting a fixed case even if weight exceeding a specific value is applied to a lever and further to prevent the permanent deformation of a leaf spring by providing a stopper to a fixation frame and the case opposite the lower end part of a movable frame. CONSTITUTION:Leaf springs 3 and 4 are suspended from the fixation frame 1 and the upper and lower ends of the movable frame 2 fixedly with screws, etc. Further, the stopper 20 is formed integrally with the case 17 opposite the lower end part of the frame 2, and a gap 21 is left between the stopper 20 and the lower end part of the frame 2. Then, when the weight of a body placed on an upper pan 2 is within a specific weight range, the gap 21 is held, but when the weight exceeds the specific value, the lower end part of the frame 2 abuts on the stopper 20 to receive the weight. Consequently, the load sensor part of the lever never contacts the case 17 and deviation in measurement and the permanent deformation of the leaf springs 3 and 4 are prevented securely.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a capacitive electronic scale for weighing objects.

Structure of conventional example and its problems A conventional capacitive electronic scale of this type has a fixed frame, a movable frame, plate springs fixed to the upper and lower ends of the movable frame and the fixed frame, and the fixed frame. a fixed electrode plate attached to the side via an insulating plate; a movable electrode plate attached to the movable frame side via an insulating plate so as to face the fixed electrode plate and be substantially parallel to each other; Although it includes an upper plate stand attached to the movable frame and a case to which the fixed frame is fixed, a stopper for regulating the movement of the lower end of the movable frame is not specially provided. In this case, if the weight of the item placed on the plate stand is within the specified weight, there is no problem with the measurement.
If a weight exceeding the specified weight is applied to the scale, the leaf spring may be greatly deformed, causing the load sensor part of the capacitive electronic scale to come into contact with the case, resulting in incorrect measurements, or the leaf spring may become permanently deformed. There were three problems, such as the machine being unable to return to its original position.

Purpose of the Invention The present invention solves the above-mentioned conventional problems, and even if a weight exceeding the specified weight is added to the scale, the weight exceeding the specified weight is received and the load sensor section is prevented from coming into contact with the case. It is an object of the present invention to provide a single capacitance electronic scale that can prevent permanent deformation of a leaf spring.

Structure of the Invention In order to achieve the above object, the present invention provides a case in which a fixed frame is fixed with a stopper facing the lower end of the movable frame, and there is a gap between the stopper and the lower end of the movable frame. is provided, and when the weight of the object on the upper plate stand attached to the movable frame exceeds a specified weight, the lower end of the movable frame comes into contact with a stopper. During measurement, the lower end of the movable frame does not contact the stopper, and if a weight exceeding the specified weight is applied to the scale, the lower end of the movable frame contacts the stopper and exceeds the specified weight. Since it can absorb weight, the load sensor part of the scale does not come into contact with the case, and as a result, there is no error in measurement. Permanent deformation of the leaf spring can also be prevented.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. In FIGS. 1 to 6, reference numeral 1 denotes a fixed frame, and this fixed frame 1 is approximately C-shaped. 2 is a movable frame, and this movable frame 2 is also approximately C-shaped. A plate spring 3.4 is suspended and fixed to the lower ends of the fixed frame 1 and the movable frame 2 using screws or the like. 5V; t.

The support plate 6 is shaped like a wedge on the left side, and the entire movable frame 2 is fixed to the inside of the vertical surface of the support plate 6 with screws or the like. 7
Vi is a fixed electrode plate fixed to the lower side of the horizontal surface of the support plate 6 via an insulating plate 85r with rivets or the like, and the fixed electrode plate 7 is located below the leaf spring 4 at the lower end. Reference numeral 9 denotes a movable electrode plate fixed to the upper side of the horizontal surface of the support plate 6 with an insulating plate 1o through an insulating plate 1o, and the movable electrode plate 9 faces the fixed electrode plate 6 and the fixed electrode plate 7 and is substantially parallel to the fixed electrode plate 7. It has become. Reference numeral 11 denotes an upper plate stand fixed to the vertical surface of the L-shaped support plate 6 on the right side with screws, etc., and this upper plate stand 11 is attached to the upper plate spring 3 at the upper end.
It is located higher up. Reference numeral 12 denotes a fixed shielding plate fixed to the upper side of the horizontal surface of the L-shaped support plate 6 on the left side with the fixed electrode plate 7 with screws, etc., and 13 is the lower side of the horizontal surface of the L-shaped support plate 6 on the right side. A movable shielding plate is fixed together with the movable electrode plate 9 by screws or the like, and the movable shielding plate 9 and the fixed shielding plate 12 shield the fixed electrode plate 7 and the movable electrode plate 9 in the vertical direction. and the leaf springs 3, 4. Fixed electrode plate7. Movable electrode plate 9. Upper plate stand 11. Fixed shielding plate 12. The movable shielding plates 13 are attached so as to be substantially parallel to each other. Also, fixed electrode plate 7. The movable electrode plate 9 and the fixed shielding plate 12 are electrically divided by cords 14, 15, and 16, and are integrally formed with a rib 18 for positioning.
A gap 21 is provided between the movable frame 2 and the lower end of the movable frame 2, as shown in FIG. Note that 22 is a cover detachably attached to the case 17, and 23 is an upper plate placed on the upper plate stand 11.

The operation in the above configuration will be explained. When an object to be weighed is placed on the second plate 23, the weight is transmitted to the upper plate stand 11, and the leaf spring 3.4 is deformed and supported via the support plate e to which the upper plate stand 11 is attached and the movable frame 2. When the plate 6 moves, the movable electrode plate 9 integrated therewith also moves. As a result, the gap between the fixed electrode plate 7 and the movable electrode plate 9 changes, and thus the capacitance between the two electrodes changes. This conversion amount is converted into an electrical signal to display the weight of the object to be weighed. In this case, if the weight of the object placed on the upper tray 23 is within the specified weight, the case 17
The stopper 20 provided at 2
Since the lower end of the stonopper 7 and 20 immediately comes into contact with the weight that exceeds the specified weight, the movable frame 2 does not move any further, and as a result, the load sensor of the scale Since the parts do not come into contact with the case 17, it is possible to reliably prevent measurement errors and permanent deformation of the leaf springs 3.4 suspended and fixed to the upper and lower ends of the fixed frame 1 and the movable frame 2.

Effects of the Invention As described above, according to the present invention, a stopper is provided in the case to which the fixed frame is fixed, facing the lower end of the movable frame, and a gap is left between the stopper and the lower end of the movable frame. The lower end of the movable frame comes into contact with the stopper when the weight of the object on the upper plate stand attached to the movable frame exceeds a specified weight. The lower end of the frame does not contact the stopper, and if a weight exceeding the specified weight is applied to the scale, the lower end of the movable frame will come into contact with the stopper, and the weight exceeding the specified weight can be received. The load sensor part of the scale no longer comes into contact with the case, and as a result, there are no errors in measurement, and permanent deformation of the leaf springs suspended and fixed at the upper and lower ends of the fixed frame and movable frame is prevented. This is something that can be prevented.

[Brief explanation of drawings]

Fig. 1 is a half-cut top view of a capacitive electronic scale showing an embodiment of the present invention, Fig. 2 is a front view of the same electronic scale, Fig. 3 is a left side view of Fig. 2, and Fig. 4 is FIG. 2 is a right side view, FIG. 5 is a side sectional view of the electronic scale, and FIG. 6 is a top view of the electronic scale with the cover removed. 1...Fixed frame, 2...Movable frame, 3.4
...Plate spring, 7...Fixed electrode plate, 8.
...Insulating plate, 9...Movable electrode plate, 10...
...Insulation plate, 11...Top plate stand, 17...
Case, 20... Stopper, 21...
gap. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 3 Figure 1 Figure 4

Claims (1)

[Claims] a fixed frame, a movable frame, a leaf spring suspended and fixed to the upper and lower ends of the movable frame and the fixed frame, and the fixed frame positioned below the leaf spring at the lower end and substantially parallel to the leaf spring. A fixed electrode plate attached to the frame side via an insulating plate, and a movable electrode plate attached to the movable frame side via an insulating plate so as to face the fixed electrode plate and be substantially parallel to each other. , comprising an upper plate stand located above the upper end leaf spring and attached to the movable frame side, and a case to which the fixed frame is fixed, and a stopper facing the lower end of the movable frame in the case. A gap metal film is provided between the stopper and the lower end of the movable frame, and the lower end of the eave edge frame comes into contact with the stopper when the weight of the object on the upper plate stand exceeds a specified weight. capacitive type