JPS59629A - 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 when the net weight is <6g to display the weight on the 2nd 2g unit 2. Therefore, the net weight is obtained on a proper minimum scale unit.

Description

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

Conventionally, some electronic scales have a weighing switching function by setting two types of minimum scale units so that the range of use can be expanded by changing a switch, from 3 kg in 11 units to 61 tlf in 2 f units. Specifically, items of 3 to 3 or less are weighed in units of 1, and items of 3 to 9 or more and 6 Kf or less are weighed in units of 22.
Because it uses a changeover switch, you have to select the larger weight (in 2r units) for heavy items, and the smaller weight (in lr units) for lighter items, which can be troublesome. K.

Even if the item is 3- or less, it may be weighed in units of 22, resulting in poor accuracy.

The present invention has been made in view of these points, and allows weighing to be changed without using a changeover switch.
The object of the present invention is to obtain an electronic scale that can maximize the weighing switching function.

The present invention sets two types of minimum scale units for weighing switching, and also provides a weighing means, a tare weight determining means, and a minimum scale unit switching means, so that a certain weight at which the weighing should be switched is set. Since the changeover is made automatically, the operator does not have to operate the changeover switch, which is convenient and allows weighing to be carried out in an appropriate minimum scale unit.

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

First, in this embodiment, as in the conventional case, two types are set: 1v as the first minimum scale unit (1) and 2t as the second minimum scale unit (2). Is it 0 in units? From 3-
Can weigh up to 2? The unit is set so that it can weigh from Of to 6Kf. Since it is a scale, it is provided with a weighing means (3) for weighing the item to be weighed. This weighing means (3) measures the weight including the tare, and a weight determining means (4) is provided for the tare, which compares this weighed weight with a constant weight of 3Kf and determines its magnitude. Also, based on the judgment result of the tare weight judgment means (4), when the measured weight is less than a constant weight of 3Kf, K is switched to the first minimum scale unit (1) (xg unit), and when the weight is more than a constant weight of 34Kf, K is switched to the first minimum scale unit (1) (xg unit). Two minimum scale units (2)
Minimum scale unit switching means (5) for switching to (2? units)
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 room clearing is performed. Then, processing of input keys, input of weight data sent from A/bo, flicker processing, auto-zero processing, and calculation of cross count (that is, weight including tare) are performed in sequence. Then, the tare weight determining means (4) determines whether this cross count value is larger or smaller than the constant weight of 3Kf. If the weight is within the range of 3 to 3, the minimum scale unit switching means (5) rounds the display data to the nearest 1 and displays the data. On the other hand, if the constant weight is 3 or more, the display data is 2? When rounding is performed in units and display processing is performed, it becomes K. That is, 0
From 2 to 3- the unit is 1, from 3111 to 6- the unit is 2
? Weighing will be done in units.

Therefore, according to the present invention, 1? automatically depends on the tared weight of the item to be weighed. Unit or 2? Since the weighing unit is changed over, there is no need to change the changeover switch. Also, items under 3Kf are always 1? It must be measured in units of 2. There is no need to weigh in units, reliability is improved, and the weighing switching function is maximized.

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 weight with a fixed weight, and a minimum scale scale based on the determination result. Since the minimum scale unit switching means for switching the unit is provided, it is possible to automatically switch the weighing weight when a certain weight is reached, and therefore,
This eliminates the inconvenience of changing a changeover switch, and also allows weighing to be performed in an appropriate minimum scale unit, thereby maximizing the weighing switching function.

[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 tare weight with a fixed weight, and a weighing means that measures the weight of the weighed item with respect to the fixed weight. 1. An electronic scale comprising: minimum scale unit switching means for automatically switching the minimum scale unit in accordance with the above.