Pencil sharpener

A pencil sharpener comprising:

• a housing part having an opening portion formed at one surface portion, an accommodation space formed therein, and a first coupling member formed on an inner surface;
• and
• a pencil sharpening part inserted into the accommodation space of the housing part, and having a second coupling member formed on an outer surface thereof and corresponding to the first coupling member, and a knife blade part provided therein,
• wherein at least one area of the pencil sharpening part is rotated by the first coupling member and the second coupling member as a pencil, which is inserted into the pencil sharpening part, carries out linear motion in the lengthwise direction of the housing part, so that the pencil is sharpened by the knife blade part,
• wherein the first coupling member is formed as at least one protrusion part and the second coupling member is formed as a screw groove, or the first coupling member is formed as a screw groove and the second coupling member is formed as at least one protrusion part,
• wherein the pencil sharpening part comprises:
• an upper rotation part, which has the second coupling part formed on the outer surface thereof so as to rotate as the pencil, which is inserted into the pencil sharpening part, carries out linear motion in the lengthwise direction of the housing part, and the knife blade part provided therein;
• and
• a lower fixed part coupled to the lower side of the upper rotation part and moving vertically without rotational motion as the pencil, which is inserted into the pencil sharpening part, carries out linear motion in the lengthwise direction of the housing part.

A pencil sharpener comprising:

• a housing part having an upper end opening portion formed at one surface portion, a lower end opening portion formed at the opposite side of the upper end opening portion, and an accommodation space formed therein;
• and
• a pencil sharpening part inserted into the accommodation space of the housing part and having a knife blade part provided therein,
• wherein a first coupling member is formed on the inner surface of the lower end opening portion,
• wherein the pencil sharpening part further comprises a rotation shaft part coupled at the lower side of the knife blade part and extended from the knife blade part to the lower end opening portion, and having a second coupling member formed on an outer surface thereof and corresponding to the first coupling member,
• wherein the rotation shaft part is rotated by the first coupling member and the second coupling member as a pencil, which is inserted into the pencil sharpening part through the upper end opening portion, carries out linear motion in the lengthwise direction of the housing part, so that the pencil is sharpened by the knife blade part.