Sheet cutter

A sheet cutter comprising:

• a placing table having a placing surface for horizontally supporting an object to be cut;
• a cutter unit for cutting the object to be cut on the placing surface;
• a pressing part for depressing the object to be cut to be horizontally held on the placing table;
• and
• a guide member for movably supporting the cutter unit between one end and another end of the placing table;
• wherein the cutter unit comprises:
• a holder member being slidably supported by the guide member, and
• a blade member being attached to the holder member;
• the blade member comprises:
• an upper blade member having a linear blade edge being arranged orthogonal to the placing surface and slanted at an acute angle in a cutting depth direction of the object to be cut, and
• a lower blade member having a circular blade edge being arranged orthogonal to the placing surface;
• the lower blade member protrudes upwardly from the placing surface at an upper end portion of the circular blade edge to overlap the upper blade member, and at a vicinity of an apex of the upper end portion of the circular blade edge protruding upwardly from the placing surface, the upper end portion of the circular blade edge is intersected with the linear blade edge at an acute angle so that the linear blade edge and the circular blade edge form a continuous cutting edge continuously extending from above the placing surface in the cutting depth direction of the object to be cut;
• the guide member has a first and a second guide members being vertically arranged through the placing surface disposed therebetween;
• the holder member has a first holder member to slidably engage with the first guide member, and a second holder member to slidably engage with the second guide member;
• and
• the upper blade member is attached to the first holder member, and the upper blade member and the lower blade member are attached to the second holder member.