JPH056649B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a multi-range load cell scale that changes the digit of a displayed value depending on the magnitude of a load.

Technical Background and Problems of the Invention Conventionally, there are multi-range load cell scales that change the digit of the displayed value depending on the magnitude of the load. For such items, the scale itself weighs between 1g and 30g.
If it has a weighing capacity up to Kg and a 4-digit display function, for example, 0 Kg to less than 2.5 Kg is displayed in 1 g units, and 2.5 Kg to 30 Kg is displayed in 10 g units. To give a specific example, if the measured value is
If the weight is 1.5 kg, it will be displayed as 1500 (g), and if it is 15 kg, it will be displayed as 1500 (10 g). Therefore, load cells used in such devices are required to have high-precision weighing capabilities over a wide range of weights from 1 g to 30 kg. However, load cells that can maintain high-accuracy weighing performance over a wide range are expensive, and even if such load cells are used, adjustments at each range are essential, which increases manufacturing costs. It has its drawbacks.

OBJECTS OF THE INVENTION The present invention was made in view of the above points, and an object of the present invention is to obtain a multi-range load cell scale that can maintain high precision weighing ability over a wide range using an inexpensive load cell.

SUMMARY OF THE INVENTION The present invention includes a high-basis load cell having one end fixed to a base, and a low-basis load cell having one end connected to a high-load receiver located at the other end of the high-basis load cell. A saucer connected to the low load receptor located at the other end and a circular saucer surrounding this saucer in the same horizontal plane are provided, and this circular saucer is connected to the high load receptor, so an inexpensive load cell can be used. The structure is such that it can maintain high precision measurement capability over a wide range.

Embodiment of the Invention An embodiment of the present invention will be described based on FIGS. 1 to 4. A case 2 is provided in the form of a housing whose bottom plate serves as a base 1, and within this case 2, one end of a hard high-basis load cell 3 (hereinafter referred to as high-basis L/C) that can handle heavy objects is fixed via a spacer 4. ing. The other end of the high-basis L/C 3 becomes a high-load receiving section 5, and a soft low-basis load cell 6 (hereinafter referred to as low-basis L/C) that can handle lightweight objects is mounted on the top of this high-load receiving section 5. One end is connected in a U-shape with a spacer 7 interposed therebetween. The other end of this low weight L/C6 that is not connected is the low load receiving part 8.
Therefore, a spacer 9 is placed above the low load receiving portion 8.
A saucer 10 is connected via. This saucer 1
0 consists of a frame 11 that is directly connected to the low-basis L/C 6 through a spacer 9 inside the case 2, and a plate plate 12 that is connected to the frame 11 and exists outside the case 2. Furthermore, this dish plate 12
A circumferential receiving plate 13 is provided which surrounds the periphery of the plate plate 12 and lies in the same plane as the plate plate 12, and this surrounding receiving plate 13 is connected to the spacer 7 between the high basis weight L/C3 and the low basis weight L/C6. . Note that the high basis weight L/C3, the low basis weight L/C6, the saucer 10, and the circulating saucer 13 are all held in a horizontal state.

Therefore, the frame 1 is placed on the base 1.
Four rod-shaped plate stoppers 14 are provided protrudingly at the four corners of the load receiving portion 5 and are opposed to each other in a non-contact manner, and a plate-shaped stopper 15 is provided at the lower part of the load receiving portion 5 to be opposed to the load receiving portion 5 in a non-contact manner. These pan holder stopper 14 and stopper 15 are for preventing damage when an excessive load is applied to the tray 10 and the rotating tray 13.

Next, a display surface 16 is formed on one surface of the case 2, and a display section 17 and a numeric keypad 18 are arranged on this display surface 16. These display sections 17
The numeric keypad 18 is connected to the high weighing capacity L/C3 and the low weighing capacity L/C6, and this connection state is shown in FIG. That is, an amplifier 19 and an analog-to-digital converter 20 (hereinafter referred to as ADC) are independently connected to the high-basis L/C 3 and low-basis L/C 6, and these ADCs 20 are connected to a microcomputer 21. . A display section 17 and a numeric keypad 18 are connected to this microcomputer 21.

In such a configuration, lightweight and small items are placed only on the tray 10, and heavy and large items are placed on the tray 1.
0 and the orbiting tray 13 to reduce the weight of each. Therefore, when weighing a light object, highly accurate weighing is performed using the low basis weight L/C6, and when weighing a heavy object, a large capacity is measured using the high basis weight L/C3.

Here, each measurement process will be explained. First, the electric signals from the high-basis L/C 3 and low-basis L/C 6 are amplified by the respective amplifiers 19, and the analog signals are converted into digital signals by the ADC 20 and sent independently to the microcomputer 21. Here, according to the information in the microcomputer 21, the high weighing L/C3 and the low weighing L/C
It is determined which of the signals from 6 is to be adopted, and then the weighing result is displayed on the display section 17. The display on the display section 17 is such that the digits of the displayed value are automatically converted according to the magnitude of the load based on information from the microcomputer 21, thereby providing a multi-range display.

As described above, according to this embodiment, the low basis weight L/
Highly accurate weighing of lightweight objects and high weighing capacity L/C using C6
3, it becomes possible to measure a large amount. Therefore, even if an inexpensive load cell is used for each load cell, highly accurate measurement can be performed over a wide range, and multi-range display can be performed based on such measurement results. It is possible.

Effects of the Invention As described above, the present invention provides a high-basis load cell by applying a load on an integrated saucer and a rotating saucer in the case of a heavy load, and a high-basis load cell by applying a load on an integrated saucer and a rotating saucer in the case of a lightweight load. By applying the load only to the saucer, each measurement is performed using a low-basis load cell, so even if each load cell itself is made of an inexpensive one, highly accurate measurement can be performed over a wide range. Therefore, it is possible to provide an apparatus with excellent cost performance at a low cost.

[Brief explanation of the drawing]

FIG. 1 is an overall longitudinal sectional front view showing one embodiment of the present invention, FIG. 2 is an overall longitudinal sectional side view, FIG. 3 is a plan view, and FIG. 4 is a block diagram showing the overall configuration. 1... Base, 3... High weighing load cell, 5...
...High load receiver, 6...Low weighing load cell, 8...
Low load receiver, 10... saucer, 13... orbiting saucer.

Claims (1)

[Claims] 1 A high-basis load cell is provided with one end fixed to the base, a low-basis load cell is provided with one end connected to the high-load receiver located at the other end of the high-basis load cell, and the other end of the low-basis load cell is connected to the high-basis load cell. A multi-range load cell weigher comprising: a receiving tray connected to a low load receiving section located therein; and a circulating receiving tray surrounding the receiving tray in the same horizontal plane, and the circulating receiving tray is connected to the high load receiving section.