JPS5823240B2 - Himokakeshikihei Koujiyougino Kakudoshijihou - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for easily and accurately determining the change in angle of a string-type parallel ruler. When used fixed at both ends, if you consider a point in the center of the hanging cord between the two pulleys at the rear end of the illustration as the origin of angle calculation, this origin will move as the angle of the parallel ruler changes. Therefore, the change in the angle of the parallel ruler and the moving distance of the origin on the assembly can be considered as a function, so if you record this by calculation or actual measurement and make an angle scale plate, you can measure the change in the angle of the parallel ruler. You can know it, and you can freely create the angle you want and draw diagonal lines.

An example of implementation of the present invention will be described with reference to the drawings.

1 is a drawing board, 2 is a parallel ruler movably placed on the drawing board 1, and 3 is a hanging string hung in an eight-character pattern.

One end 4 of this hanging string 3 is fixed 6 to one end of the front end 5 of the drawing board 1.
At the same time, pulleys 7, 71 attached to both ends of the parallel ruler 2,
The other end 4' is connected to the other end of the front end 5 of the drawing board 1 through pulleys 72 and 73 attached flat to both ends of the rear end 9 of the drawing board 1 and pulleys 74 and 75 attached to both ends of the parallel ruler 2. fixed at 6'
do.

Reference numeral 8 denotes a movable indicator needle attached to the center of the hanging cord 3 between the pulleys 7 and 7 on the rear end 9 of the drawing board 1, that is, the origin of angle calculation, and its tip 8' is an angle scale fixed on the drawing board 1. Match the 0 scale on the plate 10.

The method of attaching the parallel ruler 2 is the same as conventional ones, and by fixing both ends 4 and 4' of the hanging string 3 to the front end 5 of the drawing board 1 with appropriate tension, it can be used in the same way as a general parallel ruler. .

Next, when the tip 8' of the moving indicator needle 8 is at the 0 mark on the angle scale plate 10, which is the origin of angle calculation, the parallel ruler 2 is moved upward to the right as shown in FIG. 2, or upward to the left in the opposite direction. If an oblique angle is created, the movable indicator needle 8 will accurately move to the left or right from the origin of scale 0 depending on the length of the parallel ruler 2.

If the angle scale plate 10 is made by recording the distance traveled by the tip 8' of the movable indicator needle 8 due to changes in the angle, the angle can be easily indicated and read.

In addition, the calculated moving distance of the moving indicator needle 8 is calculated based on the angle of 1 degree, and if the length of the parallel ruler 2, that is, the length between the outer sides of the pulleys at both ends of the parallel ruler 2 is expressed as L, then It can be obtained using the formula.

Distance traveled by the tip 8'' of the movable indicator needle 8 for a 1 degree change in angle - ``x'' Generally speaking, when the parallel ruler 2 is attached to the drawing board 1, there are 2 points on the left and right.
Since changes in angles up to 0 degrees can be calculated, if you use this parallel ruler 2 in combination with a triangular ruler, by adding or subtracting the angle specified by this parallel ruler 2 to the angle of the triangular ruler, you can calculate the figure. If you want to find a 35 degree oblique angle (for example, in drawing 1), use the 30 degree angle of the parallel ruler, and use the parallel ruler 2 and 5. Find the oblique angle in degrees, and by adding and , 3
Fortune-telling can be done by finding the poly I angle of 5 degrees.

Also, a 55 degree thread (if you want to find the angle, use the 60 degree angle of the pressure ruler and set it at the 5 degree position with this parallel ruler 2)
・If we combine these angles so that they become 72 minus, we can easily obtain an oblique angle of 55 degrees.1,

[Brief explanation of the drawing]

Figure 1 shows where the tip of the moving indicator needle of the crime ruler set horizontally is at the 0-1'' position of the angle plate, and Figure 2 shows the point of the moving indicator needle of the crime ruler set horizontally. It is a diagram in which an oblique angle is formed to the right, the moving indicator needle moves to the left, and the angle is displayed on the angle scale plate 1, indicating a low roller. 1...Drawing board, 2...Parallel ruler, 3...
... Hanging string, 7゜71, 72, 73, 74,
7-... Pulley, 8... Moving indicator needle, 8'
...Tip, 10...Angle scale plate.

Claims (1)

[Claims] 1. Attach a moving indicator needle to the center of the hanging string between the two pulleys at the rear end of the drawing board of the string-type parallel ruler, and record the distance traveled by the tip of the moving indicator needle as the angle of the parallel ruler changes. Then, fix the angle scale plate created based on this on the drawing board, align the tip of the moving indicator needle with the scale 0 of the angle scale plate, which is the origin of angle calculation, and then adjust the angle scale as the angle of the parallel ruler changes. An angle indication method for a string-type parallel ruler, in which a movable indicator needle moves and at the same time aligns the tip of the movable indicator needle with a scale indicating the angle change, thereby indicating the angle change of the parallel ruler.