Lead-auto-sharpened propelling pencil and the making process thereof

A lead-auto-sharpened propelling pencil which comprises a pencil body and a pencil cap;

• said pencil body comprises a body case, a lead holder, a screwing sleeve, and a lead;
• said propelling pencil is characterized in that:
• on the outside of the front portion of said body case, said screwing sleeve with outside screwthread is installed to cooperate with a screwing insert in said pencil cap, which insert is coaxial with the tapered surface formed inside the front end of said body case;
• said lead holder has a front tapered portion and a through hole which passes through the center of said holder along its longitudinal axis and is substantially coaxial with the front tapered portion;
• the diameter of the front portion of said through hole is less than that of its hind portion in order to snug said lead;
• there are several grooves uniformally formed circumferentially around the front tapered portion of said lead holder and radially extending to said through hole;
• a lead is inserted in said lead holder, and is held by means of resilience of the front tapered grooved portion of said lead holder;
• said lead holder is arranged inside the body case with its front tapered portion fitting with the inside surface of the front tapered portion of said body case so that said lead is automatically positioned along the longitudinal axis of said body case;
• said pencil cap comprising a screwing insert, a cap case, a sharpener and a powder remover;
• said screwing insert is a hollow cylinder with inside screwthread;
• said cap case is cylindrical with a hollow stepped chamber;
• said sharpener consists of a sharpener body, blades and a powder spacer, said sharpener body is cylindrical with a through hole in its center;
• a notch is formed at one of the ends of said sharpener body;
• six blade insertion grooves which extend axially and radially to the through holes are formed and spaced uniformlly around the circumferential surface of the other end portions of the sharpener body;
• the blades, of which the edges are inclined with respect to its longitudinal axis, are adhered in these grooves, respectively, with their edges located on an imaginary cone which is coaxial with the through hole of said sharpener body;
• said powder spacer is seated on said notch of said sharpener body;
• the powder remover consists of a remover body and an outlet ring;
• said removed body is cylindrical with a flange in one end and a through hole in the center;
• a powder hole is radially formed on its circumferential surface and connects with the through hole;
• and said circular outlet ring also has a through hole on its circumferential surface and is rotationally installed around said remover body;
• said screwing insert is coaxially positioned at one end of said cap case while said sharpener is coaxially adhered inside said cap case from its other end where said powder remover is adhered.