It is not necessary to draw clearly, because the drawings only need to clearly express the improvement plan of your design based on the existing technology. The drawings in the description are used to better express the content of the invention patent. Expressed in the form of diagrams. To put it bluntly, as long as your drawings can be understood by the designer.
Requirements:
First, the layout of the picture must meet the requirements. Figures should be arranged vertically as much as possible. If the width is greater than the height and the width cannot be arranged within 14 cm, horizontal arrangement is allowed. In this case, the upper part of the figure should be placed on the left side of the paper. If there are other charts on the same page, they should also be arranged horizontally.
Second, the diagram should be drawn to scale. The size should be such that when the image is reduced to 2/3 (linear), each detail in the image can still be clearly identified. Except for some essential short keywords (such as water, steam, on, off, etc.), there must be no text in the picture. If there are two or more drawings, they should be numbered sequentially with Arabic numerals, and the number should be preceded by the word "Picture". The lines drawn on the drawing should be black and not easy to fade. The color must be dark enough, without coloring, and meet the requirements for reproduction. Drawings must be made using a drawing instrument and not blueprints.
Third, use this page as the first page of the instructions and drawings. If you can't write it down, you can continue writing it on a blank paper. The continuation page must be consistent in size and quality with the first page, and must be written vertically. Only the front side can be used, and the back side cannot be used. There should be blank space around it. The name of the invention or utility model should be centered, with a blank line between the name and the text. Mailed application documents must not be folded. There must be a margin around it, 2.5 cm on the left and top, and 1.5 cm on the right and bottom. After the application is approved, the patent right belongs to the applying enterprise or individual.