Stapler

A stapler configured to bind a workpiece using a non-metal staple, the stapler comprising:

• an operating member configured to be rotatable;
• a penetrating part configured to cause a pair of leg portions of the non-metal staple to penetrate the workpiece by rotation of the operating member;
• and
• a bending part configured to bend the pair of leg portions of the non-metal staple, which has penetrated the workpiece by the penetrating part,
• wherein the penetrating part includes a pair of cutting blades an interval of which corresponds to a length of a crown portion of the non-metal staple, and each of which is configured to form a hole in the workpiece by an insertion/withdrawal operation with respect to the workpiece,
• wherein the operating member includes a cam groove which is guided along a shaft installed to a body section of the stapler, wherein cooperation of the shaft and the cam groove defines a fulcrum axis of rotation, and
• wherein the fulcrum axis of rotation of the operating member is shifted by a shape of the cam groove in accordance with the operation of the operating member so that a distance between:
• a force receiving portion of the operating member;
• and the fulcrum axis, and a distance between:
• a force acting portion which is a connecting portion between the operating member and the penetrating part;
• and the fulcrum axis are displaced, so as to change a reduction rate of a load applied to the operating member.