The mobile cross carriers ET 46 and ET 52 meet various application purposes. Since ET 46 can be swivelled by 180 ° it is suitable for both left hand and right hand lay. The alignment ruler of ET 46 is equipped with a ball rail for standard products; for thick products conical rollers are recommended which are optionally available. In combination with a mobile knife folding unit, cross carriers are applied on combi folding machines to produce a parallel fold to the cross and three fold or a double gate fold. Following a saddle stitcher it is possible to produce a parallel fold to the back. The combination of a cross carrier, rotary feeder and mobile knife folding unit leads to a signature folding unit.