DRIVE MECHANISM FOR AN INJECTION DEVICE

The present invention relates to a drive mechanism for an injection device for setting and dispensing of a dose of a medicament, the drive mechanism comprising: - an inner body (20) fixable inside a housing (10) of the injection device (1), the inner body (20) comprising an elongated shaft (20a) extending in an axial direction (z) and having an outer thread (21), a tubular-shaped display member (60; 160; 260) having an inner thread (61) engaged with the outer thread (21) of the inner body (20), and a dose member (70) axially displaceable between a dose setting position (S) and a dose dispensing position (D) relative to the display member (60; 160; 260), - wherein the display member (60; 160; 260) comprises at least one blocking member (66) movable in axial direction (z) between a blocking position (B) and a release position (R) and engageable with a blocking structure (26) on the outer circumference of the inner body (20), - wherein when in blocking position (B) the blocking member (66) axially engages with the dose member (70) and with the blocking structure (26) to block an axial displacement of the dose member (70) from the dose setting position (S) towards the dose dispensing position (D).