CRANK SHAFT

摘要

PURPOSE: A crank shaft is provided to adjust a reciprocating movement of a reciprocating member by forming a guide slot in a crank arm. CONSTITUTION: A crank shaft is provided at one end thereof with a crank arm(40'). The crank arm(40') has a guide slot(41) so as to allow a crank pin(50) to move along the guide slot(41) of the crank arm(40'). A rotating radius of the crank pin(50) is varied depending on a rotating direction thereof so that a reciprocating distance of a reciprocating member connected to the crank pin(50) is also varied. The crank pin(50) is provided at a predetermined portion of the crank arm(40') and a connecting rod(60) of the reciprocating member is directly coupled to the crank pin(50). Since the crank pin(50) moves along the guide slot(41) of the crank arm(40'), the crank pin(50) is separately fabricated from the crank arm(40').