Unfortunately -- in my opinion, anyway -- you need to iron the quilt top before sending it to the longarmer. A longarmer needs both backing and top to be as smooth as possible when loading onto the frame. While it's fairly easy for a longarmer to ease some wrinkles out of a backing fabric which is in all one large piece (or two, or three) -- for example, by using spray starch while rolling -- it's really not possible to do that on a quilt top consisting of many pieces.