Description

The core component of the rotary pen holder is a bearing. A bearing is a rotating component that can support a shaft, reducing friction and allowing the shaft to rotate smoothly. The rotary pen holder usually uses ball bearings, which are composed of two inner and outer rings and several balls. There is a certain gap between the inner and outer rings of the ball bearing, and the ball is located on the track between the inner and outer rings. When a rotational torque is applied to the shaft, the ball will roll along the track, thereby achieving the rotation of the shaft.