Showcase assembly unit for showcase structure

A showcase assembly unit for the showcase structure including a roller support frame and a plurality of parallel sets of rollers mounted on said roller support frame, the rollers in each set of rollers being mounted rotatably and arranged one after another from the rear end toward the front end of said roller support frame, in which a plurality of commercial articles may be placed across the rollers in two or more adjacent sets on said roller support frame, and may be moving one by one along the rollers from the rear end toward the front end of said roller support frame, wherein

• each of the rollers in each of the plurality of parallel sets of rollers has a width that is smaller than the size of the bottom of a particular individual commercial article across said each of the rollers, and
• each of the rollers in each of adjacenting parallel sets of rollers is axially offset relative to each adjacent one of the rollers in each adjacent set in the direction from the rear end toward the front end of the roller support frame.