the present invention is an apparatus to attach a continuous sheet of flexible material , such as fabric , to pairs of elongated rigid members such as wooden slats . the flexible member is attached on each side to one of the pairs of rigid members . a table supports the apparatus and has recessed guides longitudinally located on each side of the table . a magazine holder overlays each of the guides and each magazine holds a plurality of elongated rigid members in an aligned , vertically stacked , relationship . a pair of slides advances a pair of the rigid members , one along each guide to a first drive mechanism . the first drive mechanism advances each of the pair of elongated rigid members at a constant linear speed into an attachment zone . flexible material is also guided into the attachment zone to lay atop each of the elongated rigid members . a pair of staplers , one overlaying each guide drives staples through the flexible material into the rigid members to attach the flexible material to each of the elongated rigid members . subsequent elongated rigid members are automatically advanced into the attachment zone for continuous assembly .