Cons of pencil sharpener
The sharpened nib is too sharp, it is easy to scratch the paper when writing, and the nib is easy to break. Because the thickness of the nib is too different, the writing will be uneven when writing; Parts are actually cut off instead of written, which is a huge waste.
From the material point of view, there are plastic, wood, metal, ceramic and so on. Most pencil sharpeners are made of plastic, and such sharpeners are more common. And those pencil sharpeners made of ceramics are relatively rare.
In the 17th century, people just sharpened pencils with knives. With the progress of society, by the beginning of the 19th century, people not only needed to use more pencils, but also had higher requirements for the time spent sharpening pencils. The pencil sharpener of the mechanical principle was born in this environment. The world's first pencil sharpener was invented by a French in 1828. Over the next few centuries, pencil sharpeners evolved into what they are known as.
The golden age of pencil sharpeners was probably from the mid-1980s to the early 1990s. In the early 1990s, automatic or electric pencil sharpeners appeared. The pencil sharpener in the traditional sense has slowly withdrawn from the stage of history.