Bale forming apparatus for forming a round bale from loose material, the bale forming apparatus comprises • a baling chamber arrangement (FH, Tg), the baling chamber arrangement (FH, Tg) having two side walls (SW.I, SW.r) and a circumferential wall (WP.F, WP.T) extending between the two side walls (SW.I, SW.r), and • a plurality of conveying units (pCU, fCU, CU.1, CU.2, CU.x) for conveying material along the circumferential wall (WP.F, WP.T) of the baling chamber arrangement (FH, Tg), wherein • the conveying units (pCU, fCU, CU.1, CU.2, CU.x) are mounted at the baling chamber arrangement (FH, Tg) and • the baling chamber arrangement (FH, Tg) is divided into a fixed chamber part and a movable chamber part (Tg), and • the movable chamber part (Tg) is pivotally mounted and can be pivoted with respect to the fixed chamber part, the bale forming apparatus is adapted • for being operated in a bale forming mode and • for being transferred from the bale forming mode into a bale ejecting mode such that • the two chamber parts (FH, Tg) together surround a bale forming chamber for forming a bale and the conveying units (pCU, fCU, CU.1, CU.2, CU.x) convey material in this bale forming chamber when the bale forming apparatus is operated in the bale forming mode and • the movable chamber part (Tg) is pivoted away from the fixed chamber part such that an ejecting aperture for ejecting a bale out of the bale forming chamber is formed when the bale forming apparatus is transferred into the bale ejecting mode, wherein at least one conveying unit (pCU) belonging to the plurality of conveying units (pCU, fCU, CU.1, CU.2, CU.x) • is mounted at one chamber part (Tg), • extends from one side wall (SW.I) to the other side wall (SW.r), and • is arranged adjacent to the other chamber part, the other chamber part comprises a receiving aperture (Ap.W) adjacent to an edge of the other chamber part, the bale forming apparatus is arranged such that the adjacent conveying unit (pCU) engages into the receiving aperture (Ap.W) if the bale forming apparatus is operated in the bale forming mode, the bale forming apparatus is further arranged such that transferring the bale forming apparatus into the bale ejecting mode shifts or pivots the adjacent conveying unit (pCU) out of the receiving aperture (Ap.W) such that the receiving aperture (Ap.W) becomes a part of the ejecting aperture, characterized in that the receiving aperture (Ap.W) extends from one side wall (SW.I) to the other side wall (SW.r) in a plane which plane is horizontal or slopes angularly downwards at least after the bale forming apparatus is transferred into the bale ejecting mode, and in that the adjacent conveying unit (pCU) is mounted at the one chamber part (Tg) such that the adjacent conveying unit (pCU) can be pivoted with respect to this chamber part (Tg) between • a bale forming position in which the pivotally mounted adjacent conveying unit (pCU) engages into the receiving aperture (Ap.W) and contributes to conveying material in the bale forming chamber and • a bale releasing position in which the pivotally mounted adjacent conveying unit (pCU) is positioned besides the ejecting aperture, and the pivotally mounted adjacent conveying unit (pCU) is arranged such that pivoting the pivotally mounted adjacent conveying unit (pCU) from the bale forming position into the bale releasing position increases the distance between • the pivotally mounted adjacent conveying unit (pCU) and • the other chamber part. • a baling chamber arrangement (FH, Tg), the baling chamber arrangement (FH, Tg) having two side walls (SW.I, SW.r) and a circumferential wall (WP.F, WP.T) extending between the two side walls (SW.I, SW.r), and • a plurality of conveying units (pCU, fCU, CU.1, CU.2, CU.x) for conveying material along the circumferential wall (WP.F, WP.T) of the baling chamber arrangement (FH, Tg), • the conveying units (pCU, fCU, CU.1, CU.2, CU.x) are mounted at the baling chamber arrangement (FH, Tg) and • the baling chamber arrangement (FH, Tg) is divided into a fixed chamber part and a movable chamber part (Tg), and • the movable chamber part (Tg) is pivotally mounted and can be pivoted with respect to the fixed chamber part, • for being operated in a bale forming mode and • for being transferred from the bale forming mode into a bale ejecting mode such that • the two chamber parts (FH, Tg) together surround a bale forming chamber for forming a bale and the conveying units (pCU, fCU, CU.1, CU.2, CU.x) convey material in this bale forming chamber when the bale forming apparatus is operated in the bale forming mode and • the movable chamber part (Tg) is pivoted away from the fixed chamber part such that an ejecting aperture for ejecting a bale out of the bale forming chamber is formed when the bale forming apparatus is transferred into the bale ejecting mode, • is mounted at one chamber part (Tg), • extends from one side wall (SW.I) to the other side wall (SW.r), and • is arranged adjacent to the other chamber part, • a bale forming position in which the pivotally mounted adjacent conveying unit (pCU) engages into the receiving aperture (Ap.W) and contributes to conveying material in the bale forming chamber and • a bale releasing position in which the pivotally mounted adjacent conveying unit (pCU) is positioned besides the ejecting aperture, and • the pivotally mounted adjacent conveying unit (pCU) and • the other chamber part.