JPS60250987A - Writing character on nameplate for instrument - Google Patents

Abstract

PURPOSE:To enable sole production and stockage of an arithmetic unit inclusive of a nameplate, by a method wherein a nameplate disposed in an instrument casing is provided with a part formed of a thermo-color material so that characters can be written on the nameplate by irradiating with light after assembling the instrument. CONSTITUTION:The nameplate 19 for indicating an aperture diameter, a standard flow rate or the like is contained in the arithmetic unit 16 for calculating the water quantity in an electronic-type water meter 20. Before assembling the unit 16, an irreversible thermo-color paint is applied to the surface of the nameplate 19, the unit 16 is solely assembled by incorporating the nameplate 19 therein, and is stocked. The unit 16 is combined with a lower casing 1 conforming to predetermined spcifications to assemble the electronic-type water meter 20 conforming to predetermined specifications. Thereafter, the nameplate 19 is irradiated with a laser beam 22 from a laser light source 21 through a glass window 17, thereby writing predetermined characters on the nameplate 19 is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for writing characters, etc. from the outside onto a nameplate disposed within a transparent window of an instrument case.

[Technical background of the invention and its problems]

For meters that are subject to the Measurement Act, the content of the nameplate is specified by law. I will now explain the situation using an electronic water meter as an example.

Figure 1 shows the structure of an electronic water meter. As shown in Fig. 1, the electronic water meter consists of a lower case (1) and an upper case (2) to which the calculation unit (f161) is attached in a watertight, airtight, and removable manner. In the 5 lower case holding the case, (3) is the inlet, (4) is the outlet, (5) is the strainer, (6) is the flow path, (force is the impeller, (8) is the impeller shaft, (9) is a permanent magnet, (1 (I is an inner case, 0υ inflow nozzle, (1
z is the outflow nozzle. The calculation unit f161 is a pulse transmitter (1) that detects the rotation of the permanent magnet (9) without contact and outputs an electric pulse proportional to the rotational speed of the impeller (force).
3I, arithmetic display unit tll that processes these pulses and integrates them with a counter, and displays the amount of water that has passed through the meter on a liquid crystal display; a battery (15), a nameplate (19, etc.) are housed in the upper case (2), and a transparent window (1η The structure is sealed with a calculation unit u
Since the e is composed of batteries, liquid crystals, and semiconductors, the humidity must be kept below a certain level, and due to the environment in which the water meter is installed, it must be tested under the Measurement Act even when submerged in water. Since it must operate normally for the 8 years of validity, we use hermetic seal technology,
It is tightly sealed by bonding with adhesive or pressure welding.

As mentioned above, the nameplate 1 is housed in the calculation unit tII, and as shown in Figure 2, this nameplate contains the following information in accordance with Article 795-3 of the Measurement Instrument Certification and Inspection Regulations under the Metrology Act. Specified water meter diameter (19a).

The standard flow rate or standard flow rate range (19b) and the type approval number (19c) specified in Article 37 of the same regulations must be indicated. However, the bore diameter, standard flow rate or standard flow rate range, type approval number, etc.
It is determined by the component specifications of the impeller (7) and the two-blade axle (8) in 10), and is not determined by the arithmetic unit ue itself. However, since it is located inside the nameplate [1 is the calculation unit) u6), the calculation unit Cl
Once 61 is assembled and sealed, it is impossible to fill in or replace it later. For this reason, the lower case (1
), we are forced to adopt a production method in which we assemble computing units only for those that have been determined to be combined with There was a problem.

[Purpose of the invention]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, it is an object of the present invention to provide a nameplate writing method that allows writing on a nameplate placed inside a case from the outside after assembly is completed.

[Summary of the invention]

In the present invention, a part made of a temperature-indicating material is formed in at least a part of a nameplate that is visible from the outside inside an instrument case and displays predetermined items, and a desired part of the name plate is formed with a temperature-indicating material from outside the instrument case. The intended purpose was achieved by creating a method for writing on instrument nameplates, which is characterized by scanning and irradiating according to the display corresponding to the item and writing on the display characters, etc.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 3 shows an embodiment of a method for writing characters on a meter name plate according to the present invention. In Figure 3, (J is the assembled electronic water meter, (1) is the lower case, !16J is the calculation unit, tl, 7) is the transparent window, tl! J is nameplate, S1
) is a laser light source, (2 is a laser beam, (time is a condenser lens, and (koji is a condensing point).

First, before individually assembling the arithmetic unit 1161, a temperature-indicating paint containing a temperature-indicating material whose color changes depending on the temperature is applied to the surface of the metal nameplate 11.1, such as an aluminum plate. As the temperature-indicating paint, an irreversible temperature-indicating paint that changes color at a relatively low temperature is selected in consideration of the effect on the electronic components housed in the calculation unit IL6J. For example, irreversible thermopaint No. 22 manufactured by Nisshin Giken Kogyo Co., Ltd. is used as a material that meets this condition. This temperature-indicating paint is 220℃
It has the property of changing from white to grayish-black only in the area where it exceeds this temperature, and remains grayish-black even when the temperature reaches a certain level.

A nameplate coated with temperature-indicating paint (Incorporate 9 and assemble the arithmetic unit 1 separately, and keep it in stock as a finished product.

Then, by using the stock arithmetic unit u61 and combining it with the lower case (1) of the predetermined specifications, the city of the predetermined specifications,
Assemble the puppy water meter (4).

The assembled electronic water meter (wall) with the specified specifications is placed on a moving table (not shown) and fixed.The laser light source (2υ) installed above the moving table is The temperature of the light spot is adjusted in advance so that it slightly exceeds 220°C.The laser light source I21) and the condensing lens (rust are adjusted to prevent the laser beam from passing through the glass window (iη) and the nameplate +19 The condensing point (24J) is connected to the surface of the light source.In this adjustment, a guide beam from an electric light source is emitted without emitting Caesar light.

Once the above light concentration adjustment is completed, move the moving table and move the nameplate to +j.
Align the focal point +24J with the part of the character to be written on l, emit a laser beam, and move the moving table to depict the character so that the locus of the focal point [yes] becomes the character. Make it. As a result, the temperature-indicating paint on the surface of the nameplate changes from white to gray-black at a temperature exceeding 220°C at the light-condensing point tZ41, and only the locus of the light-concentrating point tZ4 changes to gray-black, and the white nameplate surface changes. The corresponding gray-black characters are entered.

By the same operation, each character shown in Fig. 2 can be written on the name plate tll, and the name plate ( [9] It is now possible to externally enter legal display characters that correspond to the specifications of the electronic water meter.

Note that the present invention is not limited to the embodiments described above, and can be implemented with various modifications as described below.

Even if you do not use nameplate 1 and apply temperature-indicating paint directly to the inner surface of the transparent window, excluding the visible part of the liquid crystal display (see Figure 2), you can write the markings in the same way. .

Lb) A similar effect can be obtained by using plastic containing a material with temperature-indicating properties as the material for the nameplate.

[c] Although a laser was used as the light source, other types of light sources may be used. However, a single-wavelength light beam has poor convergence and is superior in localized heat generation, and a laser light source is optimal because it produces the effect that colors due to discoloration appear clearly and without blurring.

Cd) Temperature-indicating paints are not limited to those exemplified in the examples, but also those with a relatively low discoloration temperature, such as Japanese Patent Publication No. 51-4470.
6 can also be used.

〔Effect of the invention〕

As described in detail above, according to the present invention, a part made of a temperature-indicating material is formed in at least a part of a nameplate that is arranged inside the instrument case so as to be visible from the outside and displays predetermined items, By creating a method for writing characters on instrument nameplates, which is characterized by scanning and irradiating light beams from the outside in accordance with the display corresponding to the desired predetermined items and writing on the display characters, etc., after the assembly of the instrument is completed, the internal It becomes possible to write the required characters on the nameplate from the outside. This applies when the instrument has common usability, the specifications of the combined device are determined by the specifications of the mechanical units to be combined, and it is necessary to indicate the notation corresponding to the specification on the nameplate. As a result, production efficiency is improved, costs are reduced, and orders with short delivery times can be handled.

[Brief explanation of the drawings] Figure 1 is a cross-sectional view showing the configuration of the electronic water meter, and Figure 2 is a plane view showing the nameplate placed inside the electronic water meter in Figure 1 and examples of its written characters. 3 are explanatory diagrams of an embodiment in which the method for writing in the nameplate of a meter according to the present invention is applied to writing in the nameplate of an electronic water meter. 1-...Lower case 16...Arithmetic unit 17...
Transparent window 19... Nameplate 20... Completed assembly electronic water meter 21... Laser light source 22... Laser beam 23... Condensing lens 24... Focusing point agent Patent attorney Inoue -Male 1st Figure 1 ('fC

Claims (1)

[Claims] A part made of a temperature-indicating material is formed on at least a part of a nameplate arranged in a state visible from the outside inside the instrument case and displaying a predetermined item, and a display corresponding to the predetermined item to which a light beam is desired to be directed from the outside of the instrument case is placed on that part. A method for writing characters on a nameplate of an instrument, characterized in that characters are written on a nameplate of a meter by scanning and irradiating according to the following.