A beverage machine comprising a casing enclosing: - a first part for receiving an ingredient capsule therein, - a second part having a surface that is provided with perforating projecting members facing the first part, - an opening in the casing enabling the ingredient capsule to be inserted in a direction of insertion between the first and second parts, the first and second parts being movable relative to each other along a longitudinal axis perpendicular to the second part surface between two positions, a first position in which the first and second parts are spaced apart so that the ingredient capsule is inserted therebetween and a second position in which the first and second parts are close to each other so that the ingredient capsule received in the first part is in contact with the perforating projecting members, the insertion direction being substantially perpendicular to the longitudinal axis, the perforating projecting members are provided in an arrangement on the surface of the second part with respect to the opening so as to permanently reduce the risk of trapping of the ingredient capsule in a non-desired position by the perforating projecting members during the insertion of the ingredient capsule, wherein the perforating projecting members have each several perforating edges (90b-d) lying in a plane parallel to the surface of the second part, the perforating edges of the perforating projecting members which are oriented towards the opening being arranged at an angle to the insertion direction that is less than 90° when viewed in the plane where the perforating edges lie, wherein the second part comprises a plate having the surface provided with the perforating projecting members, and that is able to rotate about an axis perpendicular to the surface, characterized in that the machine comprising positioning means (110, 112, 114, 116, 120, 122) for positioning the surface of the plate in a predetermined angular position where the arrangement of the perforating projecting members enables permanent reduction of the risk of trapping of the ingredient capsule by the perforating projecting members during the insertion of the ingredient capsule and in that the plate is mounted against a support and positioning means comprise male cooperating means (110, 112, 114, 116) and female cooperating means (120, 122) on the support and the plate to prevent the plate from being significantly rotated from the predetermined angular position. - a first part for receiving an ingredient capsule therein, - a second part having a surface that is provided with perforating projecting members facing the first part, - an opening in the casing enabling the ingredient capsule to be inserted in a direction of insertion between the first and second parts, wherein the perforating projecting members have each several perforating edges (90b-d) lying in a plane parallel to the surface of the second part, the perforating edges of the perforating projecting members which are oriented towards the opening being arranged at an angle to the insertion direction that is less than 90° when viewed in the plane where the perforating edges lie, wherein the second part comprises a plate having the surface provided with the perforating projecting members, and that is able to rotate about an axis perpendicular to the surface, characterized in that the machine comprising positioning means (110, 112, 114, 116, 120, 122) for positioning the surface of the plate in a predetermined angular position where the arrangement of the perforating projecting members enables permanent reduction of the risk of trapping of the ingredient capsule by the perforating projecting members during the insertion of the ingredient capsule and in that the plate is mounted against a support and positioning means comprise male cooperating means (110, 112, 114, 116) and female cooperating means (120, 122) on the support and the plate to prevent the plate from being significantly rotated from the predetermined angular position.