Deburring tool and deburring method

A deburring tool, comprising:

• a case including a shank and a cylinder;
• a hollow sleeve configured to reciprocate inside the cylinder in a non-rotating manner;
• a drive gear disposed inside the sleeve, the drive gear including a saw blade shaped first tooth at a basal end portion, the drive gear configured to rotate together with the case and the sleeve;
• a reciprocating shaft to which a tip tool is mountable, the reciprocating shaft disposed inside the sleeve, the reciprocating shaft including
• a driven gear disposed at a basal end portion of the sleeve and a basal end side of the drive gear, the driven gear including a second tooth at a distal end, the second tooth meshing with the first tooth,
• a tool holder disposed at a distal end portion of the sleeve, the tool holder configured to slide inside the sleeve in a rotational direction and in a reciprocating direction, and
• a stem configured to fix the driven gear and the tool holder, the stem penetrating the drive gear,
• a first spring configured to urge the sleeve toward distal end direction;
• and
• a second spring configured to urge the tool holder from the drive gear toward distal end direction.