The first three-stage progressive correction system to achieve dynamic optimization of grip posture through replaceable sheath design. Based on the law of children's hand development, the wrist positioning (first-level support), five-finger position shaping (second-level constraint) and fingertip collaborative control (third-level guidance) are corrected in stages, breaking through the single-dimensional correction limitation of the traditional three-finger positioning method and realizing the systematic positive posture intervention of the whole hand.
2. The correction function of holding pen is directly integrated into the automatic pencil sheath. The distance between the sheath and the nib is designed according to the National Health and Health Commission's standard for children's holding pen, ensuring consistent height and stable writing, and effectively avoiding the new wrong holding posture caused by the uncertain height of the traditional external pen holder.
3. Innovate the shape of the round triangular penholder, conform to the ergonomic structure, naturally guide the thumb, index finger and middle finger to hold them separately, prevent common wrong postures such as folding fingers and holding pens, and improve the comfort and correctness of children's writing.