A device for gripping vessels is presented. The device comprises a mount, a support having a longitudinal axis coupled to the mount so to be rotatable relative to the mount around the longitudinal axis, a rotating mechanism for rotating the support, a gripper coupled to the support so to be translatable relative to the support along the longitudinal axis. The gripper has jaws for gripping a vessel, a translating mechanism for translating the gripper, at least one actuator for driving the translating mechanism and/or rotating mechanism and at least two reference elements fixed to the mount in at least two different stop positions. The jaws are passively biasable towards each other for holding a vessel in positions other than the at least two stop positions. The jaws are actively biasable away from each other by pushing the gripper against a reference element in one of the stop positions.