Knotter System for a Baler

A baler comprising a plurality of knotter systems, each of the plurality of knotter systems for performing a knotter cycle of the baler, the knotter cycle having at least a first knot forming cycle and a second knot forming cycle, each of the plurality of knotter systems comprising:

• a needle configured for delivering a needle twine;
• a tucker arm configured for delivering a tucker twine;
• a billhook assembly comprising a billhook with a lower lip and an upper lip mounted pivotally with respect to lower lip, the billhook being mounted rotatably around a rotational axis and being arranged for receiving the needle twine and the tucker twine;
• and
• a driver adapted to make the billhook perform at least a first full rotation around its rotational axis during the first knot forming cycle and a second full rotation around its rotational axis during the second knot forming cycle,
• wherein the driver comprises a pinion and at least a first and second gear stretch provided along a circumference of a disc, the pinion being adapted to cooperate with the first and second gear stretch for making the billhook perform the first and second full rotation respectively when the disc is rotated for forming the first and the second knot, respectively,
• wherein the disc comprises a recess downstream of at least one of the first gear stretch and the second gear stretch,
• wherein an obstacle is arranged for engaging the pinion when moving in the recess, and
• wherein the recess and the obstacle are configured to rotate the pinion over a determined angle and back in order to move the upper lip of the billhook away from the lower lip and back after at least one of the first full rotation and the second full rotation.