JPS60115815A - Weight measuring device - Google Patents

Abstract

PURPOSE:To meter the mass of an article invariably accurately and facilitate handling by operating a specifying switch corresponding to the gravitational acceleration of an in-use area and setting a correction rate. CONSTITUTION:A data processor 6 is equipped with a CPU7, RAM8, and ROM9 and interchanges data with an I/O port 5. Then, states of specifying switches 151-15n are read in from the port 5 and the correction rate (k) corresponding to the gravitational acceleration specified with a switch in on operation is read out of the ROM9 and set in the register for the correction rate (k) in the RAM8. Then, weight count data read in from a weight detection block 16 is corrected by the correction rate to meter the article correctly.

Description

[Detailed description of the invention] Technical field of invention The present invention relates to a measuring device capable of measuring the mass of an article.

Technical Background and Problems Various sensors are used in weighing instruments, such as a sensor that combines a spring and a photoelectric mechanism in the weight detection part, and a load cell that uses a strain gauge. Measuring instruments do not measure mass, but weight (mass x gravitational acceleration). Therefore, when the latitude changes, the gravitational acceleration changes, which causes a problem in that the weight changes. For example, if you weigh a 1 kg weight using the same measuring device, it will be 1.005 kg in Hokkaido, and 0.9951 < g in Kagoshima.
It becomes. Therefore, conventional measuring instruments were designed to match the gravitational acceleration in various regions of the country.
It was difficult to use the same measuring instrument in different regions. For example, the accuracy (ratio of the minimum scale value to the weighing value) is 1/
If we were to manufacture 3,000 measuring instruments, we would divide Japan into 11 regions according to latitude and adjust them to match the gravitational acceleration of each region.Once adjusted, they would not be allowed to be used in other regions. There is.

However, this type of measuring instrument can only be used in a limited area, so different measuring instruments must be used in other regions, and many types of measuring instruments must be manufactured, making manufacturing management complicated. There was a problem.

Also, until now, after adjusting the weight detection part, the differential amplifier, low-pass filter, A/1) converter, and logic part (CPU, ROM, RAM, I10 board, display, keyboard, etc.) were integrated. Incorporated into the circuit configuration,
It was adjusted to output a predetermined electrical signal in response to a predetermined load. As a result, the adjustment work involved double-rudder work.

Purpose of the Invention The present invention was made to solve such problems, and it is possible to adjust the weight detection block in one time, and
It is an object of the present invention to provide a measuring device that can be used in areas with different gravitational accelerations, has easy manufacturing control, and is easy to handle.

Embodiment of the Invention FIG. 1 is a block diagram showing the basic circuit configuration, and (1) is a weight detection section using a load cell using a strain gauge as a weight sensor. A voltage signal corresponding to the weight detection section (the weight of the object to be weighed x gravitational acceleration) is output. The weight detection section (1)
The voltage signal output from the converter is amplified by a differential amplifier (2), and high-frequency components such as noise are cut by a filter (3) before being input to a converter (4). The v'D converter (4) is, for example, of a double integration type, and is designed to output a digital count signal corresponding to the input voltage while repeating the sampling cycle once every 200 msec. has been adjusted to. The weight detection section (1), the differential amplifier (2), the low-pass filter (3), and the wheat exchanger (4) are integrated to form a weight detection section (16). The digital weight count data sampled by the A7D converter (4) is
10 ports (5) to a data processing device (6). The data processing device (6) includes a CPU (Central Processing Unit) (7), a RAM (Random Access Memory) (8), and a ROM (Read Only Memory) (9). , RAM (
8), the ROM (9) and the first port (5) are electrically coupled by a data bus QO) and an address node ←υ so that data can be exchanged.

In addition, the CPU (7), RAM f8), ROM (
9) is connected to the display a and the display/keyboard controller θa that controls the keyboard (1 wrinkle) via the data bus OL address bus (Iυ) so that data can be exchanged. (91
has multiple correction factors corresponding to the gravitational acceleration of various regions,
, K, ,... are programmed and %I10
The boat (5) is equipped with a plurality of designation switches 15 as designation means for selecting and designating the gravitational acceleration of the various regions mentioned above.
, 15. ,...15n are connected.

The keyboard has a thickness of 1゛0.1~ as shown in Figure 2.
9" numeric key (16), wind key αη for tare setting, 1
A clear key (18) for "°C" and a zero setting key (11) for setting the zero point are provided.

The RAM (8) is, for example, 16 as shown in FIG.
It has a 256-word configuration of X16, each word consisting of 4 bits, and forms various registers, various flag memories, etc. To describe the main memory configuration of the RAM (81) with each word indicated by M(x, Y] and each bit indicated by <>, M(F, 1) is used to set the unit of one scale. 1
A scale lens star, M[F, 2] to M(0, 2] are formed as accumulators, and M(F, 41 to M(0, a:) are formed as key buffer registers. Also, M(F, 5
3 to M[A, 51) are price display registers, M(9, 5)
~M+:5,5) is the unit price display register, M[+,s)~
M[:o, s] are respectively formed in the weight display register. Also, send M(0,7) to all working registers I) J, M[F,7:] from M[F,6] to M(0,6) to working registers [BJ, M(F,8] to Ml: 0.8
) are respectively formed in the working register (C), and M(F, 9) to M(0, 9) are formed in the display content storage register. Also, M[F,A]~M[B,A:] are net weight count registers, M[A,A]~M[6゜A]
is the weight count value register, M(E, B) ~ M[A, B
: weight zero value register, M[9,B) ~ M(5,B]
is the correction factor "K" value register, M(4,B) ~ M[O,B
) as the actual weight count register, M[D,C] to M[9
, C] as weight true value register fAJ, M[F', C], M
[:E,C] and M[2,D]″-M(0,D) into the weight true value register (Bl,M(8,C)~M(4,C)
are respectively formed in the tare weight count register. Furthermore, M(7, D) to M[3, D) are transferred to stable weight count registers, and M[C, D] to M[8, D:] are transferred to weight count registers (AJ, MCF, D:] M[D , D:] and M[:1.E:], M(0, E) as the weight count register (Bl, M[6,E] to M[3E:] as the weight count register tcL M [B, E, ]~M(7,E
:] to the weight count register (DJ, M'[F,E]~
M[C,E] and M[0,F) are weight count registers [E], M[5,F] to M[1°F]? lI: Superimposed count register tFl, M(A, F) to M[6, F:]
is the weight count register (G), u[p,F]~M[B
. There is.

611's own CPU (7) controls the RAM (81) based on the program set in the ROM (9), and its main processing is performed based on the flowchart shown in FIG.

That is, when the power is turned on, the preprocessing (2) is first performed.

When this preprocessing is completed, the key processing (■) is performed. This key processing can be carried out more easily if there is human power to press the keys from the keyboard (I3). Subsequently, the process (2), that is, the weight count data from the φ converter (4) is taken into the weight count value input register. Prior to this import, the weight count data stored in the weight count value input register and the stack count registers IAI to tGl are shifted to the stack count registers (AJ to tGl) and stored in the weight count register (8). The previous IT count data has been cleared. Next, ■
Performs flickering processing. This flickering treatment is done by 3fit.
Count register (At-) (If there is no match of, for example, 5 or more items in the weight count data in the group, the contents of the weight count value input register are taken as is into the weight true value register IAI, but if 5 or more items match. If there is one, the matching weight count data is imported into the stable t-count register, and the content of the count register is used as the weight true value count data. It is made to stabilize. When this flickering process is completed, the next process is performed. This process is performed by adding a correction factor of 1 to the double true value register (Al's double true value count data) and taking it into the register. The correction factor "" is multiplied by "" using the working register fAl~IC), and the result is taken into the weight true value register tBl.
Performs auto-zero processing. This auto-zero process sets the true weight count data in the weight zero value register as a new zero point when the true weight count data in the weight true value register (B) is within the preset count value range. That's what I do. Next, process (■) is performed. This process subtracts the contents of the weight zero value register from the contents of the weight direct value register [111 and imports it into the actual weight count register, and then subtracts the contents of the tare weight count register from the contents of the actual weight count register to obtain a net value. Import into weight count register. Further, the contents of the net weight count register are rounded to the contents of the one scale register to calculate a weight value (in Durham units), and the weight value is taken into the weight display register. Furthermore, the price is calculated by multiplying the contents of the weight display register by the contents of the unit price display register, and the price is taken into the price display register. Next, display processing (■) is performed. This display process displays the contents of each display register for price, unit price, and M quantity on the display/keyboard controller (14).
It is displayed on the display unit 0 via . This main processing is performed repeatedly through the processing routines ① to ②.

The preprocessing described in (2) above is a feature of the present invention, and is performed based on the whistle diagram 5. In other words, first of all, RAM
(8) Initialize the input board (5).

This clears RAM (8) and 12 rows (5)
Read the status of each boat and reset the boat to its initial state. Next, warm up for about 10 seconds.

This is because analog circuits such as the F&A converter (4) continue to be in an unstable state for a while after the power is turned on, so there is a delay time of more than ten seconds. Note that this warm-up time may be used to perform a process of checking the lighting of each segment of the segment display element in the display 021. Next, select the designated switch 1 from the I10 boat (5).
5. , 15. ,...Read the status of 15n and turn it on
The correction factor corresponding to the gravitational acceleration specified by the designated switch being operated is read out from the ROM (9) and then RA
M (Set the correction factor of 81 in the value register. When this setting is completed, the routine skips the preprocessing and moves on to the key process of If you use the specified switch, if you use this meter in an area where the gravitational acceleration is 9 s 1.009/di, turn on the specified switch 15. and turn on the power, and the goM (9) will display a gravitational acceleration of 981.
00980 The correction factor set corresponding to g/cd, - lighting = 0
．． 99898 will be read out and set in the correction factor 'K' value register. Therefore, the weight will be e kg (3
0,000 counts) and 1 scale is 29 (to counts)
When an article with a mass of 2 kg is weighed using a weighing machine, the weight count data read from the raw converter (4) becomes 10,010 counts due to the influence of gravitational acceleration, but this count number is corrected by "4 K+". Corrected to 10.000
Be able to count and accurately weigh items as 2,000 kg.

In this way, the correction factor corresponding to the gravitational acceleration is set when the power is turned on by simply turning on the designated switch corresponding to the gravitational acceleration of the area where it will be used before use, and the mass of the item is always accurately measured. become able to. Therefore, it can be used in areas with different gravitational accelerations and is easy to handle.

In the above embodiments, a switch is used as the designation means, but the designation means is not limited to this, and for example, a jumper wire may be used.

Effects of the Invention The present invention provides a weighing device that is capable of performing regular operations when the power is turned on, which is provided with a memory for storing correction factors for various gravitational accelerations, and also includes a plurality of designating means for designating the various gravitational accelerations. read out and set the corresponding correction factor from the memory;
At the time of weighing, the load value is multiplied by the above correction factor to perform the weighing operation, so even if the gravitational acceleration is different, if you specify the content of the gravitational acceleration using the specifying means in advance, you can always weigh the article by mass. Therefore, in manufacturing, it is only necessary to manufacture one type, and manufacturing control is easy.Moreover, the only necessary operation is the specified operation by the specified means, so handling is easy.Especially, the weight detection section and the differential amplifier , a low-pass filter, a raw converter, etc., are assembled together so that only one adjustment is required, so that the adjustment work is extremely simple.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a block diagram, FIG. 2 is a half-view showing the keyboard, and FIG. 3 is an R
A memory map showing the memory configuration of the AM, FIG. 4 is a flowchart showing the main processing, and FIG. 5 is a flowchart showing the preprocessing in FIG. 4. ■...Weight detection section, 4...Mechanical converter, 5...Mechanical boat, 6...Data processing device, 7...CPU (
central processing unit), 8... RAM (Random Access Memory), 9... ROM (Read Only Memory), 15, , 15. ,...15n...
Designated switch, 16... Sad Mouse Detection Applicant Tokyo Electric Co., Ltd. Figure 42 Country "t" ○

Claims (1)

[Claims] In a weighing device that can perform a weighing operation when the power is turned on, the weight detection section, differential amplifier, low-pass filter, converter, etc. are assembled together to generate a predetermined electrical signal for a predetermined load. A weight detection block adjusted to A measuring device characterized in that a corresponding correction factor is read out and set from the memory by specifying one of the factors, and when a needle is weighed, a weighing operation is performed by multiplying the correction factor by the correction factor.