The principle and structure of mechanical pencil

The falling core type automatically produces the core by the gravity of the core. The rotary type conveys the core by rotation. The pulsating type (pushing type) conveys the core by pressing, and the structure has a single pressing type, that is, the core is delivered by pressing once. The double-pressing type (double-stage type, commonly known as double-knocking), the time the pen mouth is pushed out of the pen holder, and the second time the core is pushed out. Double chuck push type, adopting double chuck structure, which shortens the distance between the chuck and the end of the nib, so that the last 8-15mm residual in the mechanical pencil can produce a whole without pressing The core pushes it out, and you can write continuously. Automatic compensation type (automatic core output) does not need rotating or pulsating devices, and can automatically compensate cores for continuous writing. The front flip type can directly press the nib to eject.

The pulsating movement structure is the basic structural form commonly used in mechanical pencils. It is mainly composed of a pen holder, a point cover (pen tip), a fixed core protection tube (movable damping), a chuck (flowering), a locking hoop, and a spring. When the storage core tube is affected by the pressing pressure (finger pressure), it overcomes the elastic force of the spring and moves downward, and the jaws of the chuck are opened. At the same time, the core leaves its original position in the storage core tube by its own gravity. Under the control of the damping ring of the brake element, it moves a certain length along the wall of the protective core tube. After the actuating pressure is released, the spring returns to its original position, and the core is automatically locked and positioned by the locking hoop and chuck, completing a pulsating core-out process. Reciprocating in this way can continuously pulse out the core.