Patent ID: 7386904

Claim:
A drive system for imparting motion to a treating implement having a head, the head including a treating instrument that is separately moveable from the head and having implement elements, the drive system comprising: a motor, said motor having a rotatable motor shaft; a cam rotatably driven around an axis of rotation by said motor shaft said cam having an outer surface with a closed loop cam track having an inner wall and an outer wall and being eccentric to said axis of rotation; a treating implement head remote from said cam; a control member having a control slot extending completely therethrough; a pivot member located between said control member and said treating implement head, said pivot member having a through hole, said treatment implement head having a drive connection mounted to said treating implement and disposed toward said pivot member; a drive shaft having a longitudinal axis and a drive end and a driven end, the drive end and the driven end being coaxial along the longitudinal axis, said drive end being freely mounted and received in said cam track, said drive shaft extending through said control slot and through said hole in said pivot member, said driven end being operatively mounted to said drive connection of said implement head to cause said treating instrument to move, independently of the head, in response to movement of said drive shaft, said longitudinal axis of said drive shaft being different from and at an angle to said cam axis of rotation, said control slot controlling the path of movement of said drive shaft whereby rotation of said cam causes said drive end to slide along said inner wall and said outer wall of said cam track in response to the location of said drive shaft in said control slot with said drive shaft pivotally moving through said pivot member as said drive end slides along said inner wall and said outer wall of said cam track while said drive shaft slidably moves in said control slot to transmit the pivotal movement of said drive shaft to said drive end and to said drive connection for moving said treating instrument.