Patent ID: 6550991
Filing Date: 2003-04-22
Classification: B41J

Abstract:
A method for performing paper tray alignment in a printing device, the method comprising:printing a test pattern on a first side of a page, the test pattern comprising a first graduated bar that is parallel to a first edge of the page, a second graduated bar that is parallel to a second edge of the page, and a third graduated bar that is parallel to a third edge of the page; folding the page in half to produce a first fold line at the center of the first edge of the page; reopening the page; folding the page in half to produce a second fold line at the center of the second and third edges of the page; reopening the page; determining a first location where the first fold line crosses the first graduated bar, a second location where the second fold line crosses the second graduated bar, and a third location where the second fold line crosses the third graduated bar; calculating a plane rotation angle based on the second and third locations; and calculating a plane translation value based on the plane rotation angle and the first and third locations.