JPS59628A - Electronic balance - Google Patents

Abstract

PURPOSE:To measure net weight with a proper minimum scale unit by setting two kinds of minimum scale unit and changing the scale unit automatically on the basis of net weight as a boundary according to the specified weight. CONSTITUTION:The minimum scale units of 1g and 2g are provided and weighing of 0-3kg on the 1g unit and 0-6kg on the 2g unit is carried out. When the power source is turned on, a weighing means 3 measures the weight including tare and a tare-free weight discriminating means 4 measures up to 3kg net weight on the 1g unit to display the weight on the 1st 1g unit 1. A minimum scale unit switching means 5 changes the minimum scale to the 2g unit up to 6kg net weight to display the weight on the 2nd 2g unit 2. Therefore, the net weight is obtained on a proper minimum scale unit regardless of the tare.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a load cell type electronic scale.

Conventionally, in small scales, 12 units are 3 units, and 2f units is 6 units.
There are weighing scales that have a weighing switching function by setting two types of minimum scale units so that the range of use can be expanded by changing the switch. Specifically, items below 3-1 are weighed in lt units, and items from 3K9 to 6Kf are weighed in 21-units, but because it uses a changeover switch, the weight cannot be adjusted for heavy items. The larger one (
2r unit), and for lighter items, you have to select the smaller one (unit: 1), which is cumbersome, and even if the item is 3- or less, it must be weighed in 22 units. The accuracy may become poor.

Therefore, the applicant proposed a system that automatically switches the weighing scale according to the weight of the item, such that when the tare weight is 3 to 3 or less, K is set to 1f units, and when it is 39 or more, K is set to 22 units. It has been suggested. According to this, Oy
Items from 3 to 3 can always be weighed in 111 units, but if you set a large tare weight, the minimum scale unit is 1? The range that can be measured becomes narrower. For example, when taring 100f, the net weight is 29009
The range up to 1f is a unit, and the range from 2900t to 590Of is a unit of 2.

The present invention has been developed in view of these points, and focuses on tare weight subtraction while ensuring automation of weighing switching, allows for good weighing in the optimal minimum scale unit, and has a weighing switching function. The purpose is to obtain an electronic scale that can be used to its maximum potential.

The present invention sets two types of minimum scale units for weighing switching, and by providing a measuring means, a tare weight determining means, and a minimum scale unit switching means, a certain weight at which the weighing should be switched is set. It is convenient because the operator does not need to operate a changeover switch, and the system is configured so that weighing can be performed using the appropriate minimum scale unit for the net weight. This is what I did.

An embodiment of the present invention will be described based on the drawings.

1. In this embodiment, as in the past, two types are set: ly as the first minimum scale unit (1) and 22 as the second minimum scale unit (2), and the 11 units are 02 to 3K.
It is set so that it can weigh up to t, and in units of 22, it can weigh from Oy to 6Kf. However, since it is a scale,
Weighing means (3) are provided for weighing the items to be weighed. A tare weight determining means (4) is provided for comparing the weight obtained by subtracting the tare amount from the weight measured by the measuring means (3) with a constant weight 3 o'clock to determine the magnitude thereof. Also, based on the determination result of this tare weight determination means (4), 1. If the tare weight is less than the constant weight 3q, the first minimum scale unit (1) (If switched to the year unit, and when the constant weight is 31 or more, K is the second minimum scale unit (2)
(29 units) Minimum scale unit switching means (5)
is provided.

In such a configuration, processing is performed according to the flowchart shown in FIG. First, when the power is turned on, I1
Preprocessing such as 0 reset and RAM clearing is performed. Processing of input keys, input of weight data sent from A/Do, flickering processing, auto zero processing,
Calculation of gross count (ie weight including tare) is performed sequentially. Therefore, based on the calculation of this cross count, the net weight is obtained by subtracting the tare weight, so a net count is calculated. Then, the tare weight determining means (4) determines whether this net count value is larger or smaller than a constant weight of 3Kf. Now, if the constant weight is less than 34, the minimum scale unit switching means (5) changes the display data to 1? Rounding is performed in units and display processing is performed. On the other hand, if the weight is greater than or equal to a certain weight, the display data is rounded up to 2f units and displayed.

Therefore, for example, when taring 100f, the net weight is up to 3 noodles in lt unit, and the net weight is 3 Kf.
to 59009 are measured and displayed in 2v units. In other words, if we look at 1 as a unit, it is not the unit of 1v from the zero point to 3 kg, but the unit of lt is from zero to 3 on the tared display, and in the end, regardless of the amount of tare. This allows the range that can be measured on a yearly basis to be constant.

Therefore, the automatic weighing changeover is convenient because there is no trouble such as changing the changeover switch, and items with a net weight of 3 grains or less are always weighed in 12 units, and this is weighed in rough 2f units. , the display will not occur, reliability will be improved, and the weighing switching function will be maximized.

Note that scales sometimes display negative weight, but the same is true. For example, if you tare 5Icf and
If 14 tares are removed, the minimum scale will be 12 units, and if any more are removed, it will be displayed in 22 units.In the end, the range that can be measured in lr year units is 3K regardless of the tare amount.
f is fixed.

As described above, the present invention sets two types of minimum scale units for weighing switching, and also includes a weighing means, a tare weight determination means for comparing the tare subtraction weight with a constant weight, and a tare weight determination means for comparing the tare subtraction weight with a constant weight, and Since a minimum scale unit switching means for switching the scale unit is provided, the weighing can be automatically switched when a certain weight is reached, thereby eliminating the inconvenience of having to change the changeover switch. ,
At this time, since the switching is performed based on the net weight, it is possible to perform weighing in an extremely appropriate minimum scale unit, and the weighing switching function can be maximized.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, with FIG. 1 being a block diagram and FIG. 2 being a flow chart. 3...Measuring means, 4...Tare weight determination means, 5.
... Minimum scale unit switching means Applicant: Tokyo Electric Co., Ltd. Page 1 continued 0 Inventor: Yoshihiko Yoneyama 233-20 Nita, Kannami-cho, Tagata-gun, Shizuoka Prefecture Inside Fuji Research Institute Kannami Factory

Claims (1)

[Claims] A weighing means that sets two types of minimum scale units for weighing change and measures the weight of the item, a tare weight determination means that compares the weight after subtracting the tare with a constant weight, and a weighing means that measures the weight of the weighing item with respect to the constant weight. - An electronic scale characterized by being provided with a minimum scale unit switching means for automatically switching the minimum scale unit according to the magnitude of the quantity.