Don't Underestimate The Ballpoint Pen, The Construction Is Not Simple At All

- Mar 26, 2020-

The ball-point pen is a writing tool that uses dry thick ink and relies on the freely rotating steel balls on the pen tip to transfer to the paper. It has the advantages of simple structure, convenient carrying, smooth writing, and suitable for copying.


A ballpoint pen is a pen that uses tiny rotating balls made of brass, steel, or tungsten carbide to release ink onto paper while writing


We can see that a small ballpoint pen consists of a dozen parts


The ballpoint pen's telescoping work process is divided into eight steps. The first to fourth steps are the refill extension process, and the fifth to eighth steps are the refill retraction process.


The ballpoint pen structure motion diagram is composed of three parts, namely the black ejector, the yellow turntable, the blue chute, and the red is a partial screenshot of the chute. (The spring is to ensure that the yellow turntable is in close contact with the blue chute).


When we press the top of the ballpoint pen with a finger, we apply a downward pressure to the ejector rod. The ejector rod moves along the chute to press the turntable to move downward. When the engagement between the turntable and the chute is disengaged, the pointed feature of the ejector head A radial force is generated at the contact with the inclined surface of the turntable to force the turntable to rotate, and the pen core is extended.


When the ejector rod is pressed again, the pointed features of the ejector rod head are separated from the inclined surface of the turntable, the turntable is rotated by the radial force, the engagement of the turntable and the chute coincides, and the pen core retracts.