A shedding machine includes an eccentric system rotatable about a main axis; a lever; and a transmission rod, coupled to the eccentric system and pivotally to the lever about the eccentric axis and connecting rod axis spaced apart by a connecting rod center distance, the main axis and the eccentric axis being spaced apart by an eccentric center distance. To facilitate the adjustment of the stroke of a heald frame operated by the machine, which includes an adjustment system, allowing an adjustment configuration where the eccentric distance or connecting rod distance is adjustable, and a locked configuration where these distances are fixed. The machine also includes a locking system, which allows lever locking and lever release configurations.