The present invention relates to an injection device. The injection device comprises a body for holding a syringe that has a needle at one end and a cap that is removably attached to the body. The cap has a needle shield to cover said needle. The injection device further comprises a gear assembly comprising a first rotary gear and a first linear gear to engage with the first rotary gear. The gear assembly is configured such that rotation of the first rotary gear drives the first linear gear to urge the needle shield away from the body. An actuator is provided that is configured to rotate the first rotary gear.本發明涉及一種注射裝置。該注射裝置包括用於保持一端具有針的注射筒的主體和可移除地附接到主體的蓋。該蓋具有用以覆蓋該針的針護罩。該注射裝置還包括傳動組件,該傳動組件包括第一旋轉式傳動裝置和與該第一旋轉式傳動裝置接合的第一線性傳動裝置。該傳動組件被構造成使得第一旋轉式傳動裝置的旋轉驅動第一線性傳動裝置促使針護罩遠離主體。提供了致動器,其被構造為使第一旋轉式傳動裝置旋轉。11‧‧‧殼體/主體17‧‧‧針18‧‧‧注射筒/針筒20‧‧‧注射裝置/自動注射器27‧‧‧致動器/槓桿臂28‧‧‧齒條/線性傳動裝置28A‧‧‧齒29‧‧‧軸齒輪/旋轉式傳動裝置29A‧‧‧齒
