A dose setting mechanism for a medicament delivery device, which dose setting mechanism comprises, a tubular member 10, 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, coaxial with the tubular member 10, and axially movable but rotationally locked relative to the tubular member 10, and further being axially jointly movable with the dose drum 40, wherein the stop member 90 comprises a first stop element 96 and in that said dose drum 40 comprises a second stop element 46, and wherein said first stop element 96 and said second stop element 46 are configured to interact with each other to limit rotation of the dose drum 40 to a predetermined angular interval.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);劑量圓筒(40),與該管狀構件(10)同軸向、且係可相對該管狀構件(10)軸向地及旋轉地運動;止動構件(90),與該管狀構件(10)同軸向,並可相對該管狀構件(10)軸向地運動、但在旋轉方面被鎖定,且進一步可與該劑量圓筒(40)軸向共同地運動;其中該止動構件(90)包含第一止動元件(96),且其中該劑量圓筒(40)包含第二止動元件(46),及其中該第一止動元件(96)及該第二止動元件(46)被建構來彼此互相作用,以將該劑量圓筒(40)之旋轉限制至預定角間隔。40‧‧‧劑量圓筒45‧‧‧面朝近側部分46‧‧‧止動元件90‧‧‧止動構件95‧‧‧面朝遠側部分96‧‧‧止動元件98‧‧‧軌道從動部100‧‧‧劑量圓筒從動件
