The disclosure relates to a harvester capable of continuous bailing of crop material, particularly to a harvester comprising a crop supply chamber positioned in front of a bale chamber, capable of storing crop material during the wrapping of a bale of harvested crop material. The crop supply chamber further comprises a supply inlet at the bottom of the crop supply chamber, a movable control plate positioned within the crop supply chamber, and a movable rear wall capable of adjusting the size of the supply inlet.