Patent ID: 7690648

Claim:
A sheet aligning device of a printing press disposed downstream of a feeder board for laterally aligning each of sheets of paper during conveying of said sheets by the feeder board from a sheet feeder to a printing unit in a sheet conveying direction comprising: first and second aligning plates disposed on opposite lateral sides of the feeder board, said first and second aligning plates respectively having driving members that reciprocate independently of each other in a direction orthogonal to the sheet conveying direction and each having a sheet abutting surface parallel to the sheet conveying direction; an input member for inputting a sheet width; and a controller for controlling the first and second aligning plates so that: the first aligning plate is moved to allow the sheet abutting surface thereof to be brought into abutment with a first lateral side of each sheet, thereby allowing the distance between the sheet abutting surface of the first aligning plate and a reference line set along the sheet conveying direction to be half of the width of the sheet inputted by the input member, and thus laterally aligning the sheet; wherein in a case where the input sheet width is equal to or larger than a given sheet width, the second aligning plate is moved to allow the distance between the sheet abutting surface of the second aligning plate and the reference line set along the sheet conveying direction to be more than half of the width of the sheet inputted by the input member thereby allowing a second lateral side of each sheet to pass through a sheet-lateral-side passing zone on the second aligning plate, said sheet-lateral-side passing zone being located closer to a centerline of the sheet than the sheet abutting surface of the second aligning plate is and having a flat surface throughout the sheet conveying direction; and wherein in a case where the input sheet width is smaller than the given sheet width, allowing the second lateral side of each sheet to pass through a given area, said given area being located away from a laterally inward side of the second aligning plate, said laterally inward side being close to the centerline of the sheet.