creaser

n. 1. A tool, or a sewing-machine attachment, for making lines or creases on leather or cloth, as guides to sew by. [ 1913 Webster ]

2. A tool for making creases or beads, as in sheet iron, or for rounding small tubes. [ 1913 Webster ]

3. (Bookbinding) A tool for making the band impression distinct on the back. Knight. [ 1913 Webster ]