Disclosed is an injection device comprising parts, the relative movement ofwhich causes the active substance to be injected. For this purpose, a receptacle(103, 203), into and in which a carpule/syringe can be inserted and mounted, isretained in a housing (101, 201), the receptacle (103, 203) can be moved by meansof a carriage (108, 208), and a plunger (104, 204) that applies a force to the piston/s(111A, 111B； 211) of the carpule/syringe is movably retained in the receptacle(103, 203). A traction rope (114, 214) which is deflected by means of a roll (109,209) mounted on the carriage (108, 208) is provided for performing the prickingstroke, injection stroke, and retracting stroke. One end of the traction rope(114, 214) is connected to the receptacle (103, 204) while the other end thereofis connected to a tension spring (110, 210) that is retained on the housing (101,201). Automatically and/or manually actuatable mechanisms between the housing(101, 201), the receptacle (103, 203), the plunger (104, 204), and the carriage(108, 208) control the reciprocal coupling thereof to the traction rope (114,214) and thus the sequence of the pricking stroke, injection stroke, and retractingstroke and are fitted with at least one means that allows the user to adjust theprogress profile of at least one of the strokes.
