Patent ID: 7793424

Claim:
A positioning device comprising a frame ( 60 ); a motor ( 61 ) having a drive shaft; a spindle ( 63 ; 63 ′) having a first end ( 71 ) and a second end ( 76 ) and being rotatable in relation to the frame ( 60 ); a coupling ( 62 ) resiliently connecting said drive shaft to said first end ( 71 ) of said spindle ( 63 ; 63 ′) such that the spindle ( 63 ; 63 ′) rotates when the drive shaft of the motor ( 61 ) rotates, wherein the coupling ( 62 ) comprises at least one elastic transmission element ( 85 ); and a support assembly ( 72 , 74 , 75 ; 113 ) elastically supporting at the frame ( 60 ) at least one of the second end ( 76 ) of the spindle ( 63 ; 63 ′) and the motor ( 61 ), wherein an O-ring ( 74 , 75 ) or an elastic disc ( 74 , 75 ) of the support assembly ( 72 , 74 , 75 ) and/or an elastic transmission element ( 85 ) bias the drive shaft ( 69 ) and the spindle ( 63 ; 63 ′) towards each other.