Sharpener

A sharpener, comprising:

• a clamping component, which comprises two mirror symmetric clamping arms, wherein a middle of each of the clamping arms is connected together at a first rotating shaft;
• a sharpening seat, configured to fix a sharpening stone, a working surface of the sharpening stone is a grinding surface;
• a sharpener holder, which is configured to slide back and forth along an axial direction of the sharpening seat, the sharpener holder comprises a horizontal rod perpendicular to the axial direction of the sharpening seat and parallel to the grinding surface;
• an arm body, one end of the arm body is sleeved on the horizontal rod and slides axially along the horizontal rod and pitches around the horizontal rod, and the other end of the arm body is fixedly connected at the first rotating shaft, and the first rotating shaft extending through aligned holes of the clamping arms and the second arm segment;
• a bearing ring, which is coaxially sleeved outside the arm body and is clearance fit with the arm body, and a connecting ear is provided on an outer circumference of the bearing ring;
• four articulated rods arranged symmetrically in two pairs, each of the articulated rods has a first end hinged to the connecting ear, and a second end hinged to a rear end of a respective clamping arm;
• a driving component, which is provided on the arm body and configured to push the bearing ring to move axially along the arm body, thereby causing the two clamping arms to synchronously open and close through the symmetrical articulated rods to clamp or release a cutting tool;
• wherein the driving component comprises a driving nut and a first thrust bearing.