JPS58140601A - Production of display scale plate for protractor - Google Patents

Abstract

PURPOSE:To provide a method which is suited for mass production by etching display indices such as scales and figures as well as marks for center holes for plural pieces of protractors on a blank plate with the measuring datum plane formed by polishing the long side edge of said plate as a reference, then punching the center holes and pressing the outside circumferential shapes. CONSTITUTION:The long side edge of a blank plate 1 of a rectangular shape is polished to form a measuring datum plane 2. With the plane 2 as a reference, display indices 3 such as scales and figures and marks 5 for center holes 4 for 3 pieces of protractors are etched on the blank plate. The center holes 4 are punched on the marks 5 for the holes 4 and with the plane 2 as a working reference, outside circumferential shapes 6 are blanked with a press, whereby display scale plates 7 are completed. The above-mentioned method is suited from mass production as compared to conventioanl production systems by each sheet and the accurate plates 7 are produced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a semicircular protractor O1 used for angle measurement.
The purpose of the present invention is to provide a method for manufacturing a minute scale display scale plate that can be manufactured accurately and efficiently, and will be described below with reference to the accompanying drawings.

First step: As shown in FIG. 1, the long edges of a rectangular blank plate (1) are polished to form a measurement reference surface (sword).

As shown in the second milling m2WJ, the polished measurement reference surface (
Display teeth 1 for scales, numbers (not shown), etc. based on 2)
Etch five marks (9) for i (3) and the center hole (4).

#3 As shown in the 3rd WJ of the process, mark (5) of the center hole (4)
), make 9 center holes (4).

4th step As shown in Figure 4, the outer W4 shape (6) is punched and pressed using at least the polished reference surface (2) as a processing reference. ) and metrics 111 (202
Positioning is performed at each location, and the outline is punched out using a single press as a processing standard.

With this, the display scale plate (7) of the protractor is completed as shown in Figure 4.0 Then, as shown in Figure 5, fit the center hole (4) and the K center pin (8). Bin (-K.

A measurement standard (10) having a reference mark (9) at the end is pivoted so as to be horizontally pivotable, and a protractor (→) is assembled and completed.

To explain the conventional manufacturing process: 1st process: As shown in Figures 6 and 7, the blank plate (11j) is press-processed to form the entire outer shape. 2nd process: As shown in Figure 8, the punched material is (12) K scale/numerals (not shown) hemorrhoid display index θ6) and the mark (15) of the center hole (14) are individually marked on the outer peripheral shape (16
) as the processing reference 〇6th process At the mark (15) of the center hole (14)
).

Fourth step: Distance between 0 degree and 180 degree scales is 1 m (polish the measurement standard m (17) while introducing A to N) ◇ In this way, the display scale plate (18) is manufactured.

However, such conventional processes are not suitable for mass production and cannot produce accurate display scale plates, i.e.,
First, the etching process in the 21st hole uses the outer circumferential shape (16) of the punched material (12) as the processing reference, and since the processing reference is an arc shape, it is extremely difficult to position. It is unsuitable as a processing standard, and accurate etching cannot be performed.Secondly, the polishing of the measurement reference surface (17) in the fourth step is on a scale of 0 degrees and 180 degrees).
It is necessary to perform polishing while checking C + short distance C. In addition, the processing standard in this process is also positioning based on the outer circumferential shape (16), so it is difficult to position, and at the same time it is not suitable for mass production. It also had the disadvantage of being expensive and uneconomical.

In order to eliminate such defects, the present invention polishes the long edges of the blank plate (1) as described above to create a measurement reference surface (2).
), and a second step of etching a plurality of display indicators such as scales and numbers (1 and 2 marks for the center hole (4)) based on the measurement reference surface (2). 1M
A third paulownia for drilling a center hole (4) at the mark (5) of the center hole (4), and at least the polished measurement reference surface Q.
) is used as a processing reference, and the fourth step consists of pressing the outer peripheral shape (6) to cut out the outer shape.In the first step, at the root, first, a plurality of measurement reference surfaces (2) are simultaneously polished. By processing the birds regardless of their relative positions, it is possible to mass-produce only the first bird, and the second
In the process), etching is performed using the polished measurement reference surface (2) as a reference, and the etching of display indicators such as scales and numbers can be performed extremely easily and accurately. Similarly, since the outer layer shape (6) is punched and pressed using the polished measurement reference surface (2) as a reference, accurate positioning is possible, and therefore, the display scale plate (force) can be manufactured accurately and well. .

In addition, positioning in each process is easy9, making it suitable for mass production and significantly reducing manufacturing costs, making it possible to manufacture products at low prices.

As described above, the present invention provides a method for manufacturing a display scale plate for a protractor, which has revolutionary effects such as being able to accurately and efficiently manufacture a half-moon-shaped display scale plate for a protractor used for angle measurement. will be provided.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and are shown in FIG.
Figures 2, 5, and 4 are manufacturing engineering diagrams, number 58! 1 is a completed drawing, and FIGS. 6, 7, 8, and 9 are conventional OII manufacturing process drawings. (1)...Blank plate, (2.@Measurement reference surface, (...
・Display index, (4)...center hole, (5)...marker,
(J...outer w4 shape. February 16, 1981 applicant: Niigata Seiki Co., Ltd. Inventor: Shigeo Igarashi 11q Keyaki)

Claims (1)

[Claims] A first step ii of polishing the long edge of the blank plate O to form a measurement reference surface, and display indicators such as scales and numbers and a mark for the center hole based on the measurement reference surface. A second step of etching a plurality of holes, and a third step of drilling one hole in the 1wi center and one hole in the O hole mark. A method for manufacturing a display scale plate for a protractor, comprising a fourth step of punching and pressing the shape of the outer layer using at least the polished measurement reference surface as a processing reference.