Patent ID: 8795571

Claim:
A de-curling apparatus comprising: a first roller having a concave shape; a second roller contacting said first roller, said second roller having a convex shape mirroring said concave shape; actuators operatively connected to said first roller and said second roller, said actuator actuators changing position said first roller and said second roller relative to each other, and said actuators controlling rotational speeds of said first roller and said second roller to cause said first roller to rotate at a different rotational speed from said second roller and establish a relative rotational speed difference between said first roller and said second roller; and a nip being formed between said first roller and said second roller, at least one sensor that measures the amount of curl present in material that reaches said nip, a controller operatively connected to said actuators and the at least one sensor, said nip changing a curl characteristic of material fed from a roll of said material through said nip, said controller automatically and continually adjusting an amount of pressure applied at said nip between said first roller and said second roller using said actuators based on said amount of curl present in said material as said material is unrolled from said roll into said nip, and said controller automatically and continually adjusting said relative rotational speed difference between said first roller and said second roller using said actuators based on said amount of curl present in said material as said material is unrolled from said roll into said nip.