The area of panels used in an airbag that inflates so that a recess extends in the vertical direction between a left chamber and a right chamber. The beam winder utilizes a circularly arced yarn spool rack that feeds each yarn to an alignment comb through associated guide tubes. At least one equalizing tube completely penetrates the removal chamber in the longitudinal direction of the apparatus such that a hydraulic connection is established between the respective regions that adjoin the outer faces of the two volume bodies disposed opposite of the removal chamber.