US Patent 7107699 Workpiece size alignment device

A workpiece size alignment device includes a rail set including a plurality of guide rails each having a top face formed with an elongated guide channel extended longitudinally, and a ruler set mounted on the rail set and including a plurality of rulers each removably mounted in the guide channel of a respective one of the guide rails. Thus, the workpiece size alignment device has multiple rulers having different units for use and replacement, so that the operator can select the rulers having different units according to different working requirements, thereby greatly facilitating the operator working the workpiece.