A driver for driving a spindle of a drug delivery device is provided. Said driver comprises a first component (44； 207) and a second component (46； 212) rotationally coupled to said first component (44； 207). During resetting of said drug delivery device, said first component (44； 207) is rotationally decoupled from said second component (46； 212).本發明提出一種用於驅動藥物傳送裝置之心軸的驅動器。該驅動器包括一第一組件(44；207)及一旋轉耦接於該第一組件(44；207)的第二組件(46；212)。在該藥物傳送裝置之復歸期間，該第一組件(44；207)旋轉脫離該第二組件(46；212)。
