A device for treating objects, having a) a treatment chamber, which has at least one wall having a first wall section and having a second wall section, wherein a gap extending in the wall is formed between the wall sections (32, 34); b) at least one first and one second working unit (16.1, 16.2), in particular painting robots (18.1, 18.2), which each comprise at least one component which extends from an outer region outside the treatment chamber though the gap into the treatment chamber, wherein the working units can be moved along the gap; c) a covering assembly, which seals the gap in the wall of the treatment chamber, apart from ca) a first through opening, through which the at least one component of the first working unit (16.1) extends and which follows a movement of the at least one component of the first working unit (16.1) along the gap; cb) a second through opening, through which the at least one component of the second working unit (16.2) extends and which follows a movement of the at least one component of the second working unit (16.2) along the gap, characterized in that d) the covering assembly comprises a covering band, which extends at the gap and which is fastened on a first fastening side and on a second fastening side of the first working unit (16.1), wherein the two fastening sides (48, 50) lie opposite one another in the longitudinal direction of the gap; wherein e) the covering band is guided by means of a deflection device from the first fastening side to the second fastening side of the first working unit (16.1); f) the covering band is guided from the first fastening side of the first working unit (16.1) to the second working unit (16.2), where it is lifted away from the gap by means of a lifting device and guided past the second working unit (16.2). a) a treatment chamber, which has at least one wall having a first wall section and having a second wall section, wherein a gap extending in the wall is formed between the wall sections (32, 34); b) at least one first and one second working unit (16.1, 16.2), in particular painting robots (18.1, 18.2), which each comprise at least one component which extends from an outer region outside the treatment chamber though the gap into the treatment chamber, wherein the working units can be moved along the gap; c) a covering assembly, which seals the gap in the wall of the treatment chamber, apart from ca) a first through opening, through which the at least one component of the first working unit (16.1) extends and which follows a movement of the at least one component of the first working unit (16.1) along the gap; cb) a second through opening, through which the at least one component of the second working unit (16.2) extends and which follows a movement of the at least one component of the second working unit (16.2) along the gap, characterized in that ca) a first through opening, through which the at least one component of the first working unit (16.1) extends and which follows a movement of the at least one component of the first working unit (16.1) along the gap; cb) a second through opening, through which the at least one component of the second working unit (16.2) extends and which follows a movement of the at least one component of the second working unit (16.2) along the gap, d) the covering assembly comprises a covering band, which extends at the gap and which is fastened on a first fastening side and on a second fastening side of the first working unit (16.1), wherein the two fastening sides (48, 50) lie opposite one another in the longitudinal direction of the gap; wherein e) the covering band is guided by means of a deflection device from the first fastening side to the second fastening side of the first working unit (16.1); f) the covering band is guided from the first fastening side of the first working unit (16.1) to the second working unit (16.2), where it is lifted away from the gap by means of a lifting device and guided past the second working unit (16.2).