As for the automatic dosing device, Drive feature because it is released the computer (10 and 12) with, the injector which possesses the needle in the toe of switch which is laid out to this internal (13) or the trigger part (18) at the time of operation in order to manipulate the cartridge and the automatic dosing device (60)With it possesses, the trigger part from pause position to arm position for moving for the computer is installed in the crevice or the opening of this internal, one side of the contact surface of the trigger part and the computer part, the other cooperation aspect (36) with the contact area which promotes the fact that elastically sleeve contacts (34) has, offers the sustaining power for the movement of the trigger which faces to arm position.< Choice figure >Drawing 12自動注入装置は、本体(10、12)と、本体内に配置された前端に針を有する注射器(13)又はカートリッジと、自動注入装置を操作するためにトリガ部品(18)の作動に際して解放されるための駆動機構(60…)とを有し、トリガ部品は、休止位置から発射位置まで本体に対する移動のために本体内の凹部又は開口部に取り付けられ、トリガ部品及び本体部分の隣接面の一方が、他の協働面(36)と弾性的に摺動接触することを促進する接触面(34)を備え、発射位置に向かうトリガの移動に対する抵抗力を提供する。【選択図】図12