A dose setting mechanism for a medicament delivery device, which dose setting mechanism comprises, a tubular member 10 having a longitudinal track 18 of a predetermined length； a dose drum 40, coaxial with the tubular member 10, and being axially and rotationally movable relative to the tubular member 10； a stop member 90, axially movable but rotationally locked relative to the tubular member 10, and further being in an axially slaved connection with the dose drum 40； wherein said stop member 90 comprises a track follower 98 in engagement with the longitudinal track 18, such that rotational movement of the dose drum 40 relative to the tubular member 10 may cause a maximum axial displacement of said dose drum 40 and said stop member 90, relative to the tubular member 10, corresponding to said predetermined length.用於藥物輸送裝置的劑量設定機構，該劑量設定機構包含：管狀構件(10)，具有預定長度之縱向軌道(18)；劑量圓筒(40)，與該管狀構件(10)同軸向，並可相對該管狀構件(10)軸向及旋轉運動；止動構件(90)，可相對該管狀構件(10)軸向地運動但在旋轉方面被鎖定，且係進一步與該劑量圓筒(40)呈軸向隨動連接；其中該止動構件(90)包含與該縱向軌道(18)嚙合的軌道從動件(98)，使得該劑量圓筒(40)相對該管狀構件(10)之旋轉運動可造成該劑量圓筒(40)及該止動構件(90)相對該管狀構件(10)的最大軸向位移，而對應於該預定長度。
