Drive mechanism for a drug delivery device

摘要

A first output member (8) is rotatable around an axis (4) relatively to the body (1). A second output member (9) is movable relatively to the body along the axis. The first output member and the second output member are rotationally coupled. A drive feature (6, 7) is provided to generate a rotation of the first output member. A part (10) which is removable from and attachable to the body is provided so that the first output member is unidirectionally rotationally coupled with the drive feature when the part is attached to the body.