Patent ID: 8613444

Claim:
A roller nip structure comprising: a pair of rollers forming a nip, said rollers rotating in opposite directions to cause sheets of media to move along to a media path; a first frame structure supporting a first roller of said pair of rollers, said first frame structure holding said first roller; and a second frame structure supporting a second roller of said pair of rollers, said second frame structure being adjustable in a first direction toward said first roller to move said second roller toward said first roller, said second frame structure having a variable pivot position such that said second frame structure automatically moves in a second direction perpendicular to said first direction to move said second roller in said second direction, said first frame structure being automatically adjustable in a third direction opposite said first direction toward said second roller to move said first roller toward said second roller, said first roller having a first axis about which said first roller rotates, said second roller having a second axis about which said second roller rotates, a straight reference line connects said first axis and said second axis when said first roller and said second roller are full size, said first frame structure keeping said first axis on said straight reference line, coordinated movement of said second frame structure in said first direction and said second direction keeps said second axis on said straight reference line as a size of said first roller and said second roller decrease because of wear, and said coordinated movement compensating for arc movement said second roller experiences because of said wear.