Patent ID: 9221280
Filing Date: 2015-12-29
Classification: B41J

Abstract:
1. A method for applying vacuum force across a width of a web of movable print medium as it moves through a printing system and determining if positions of a pair of adjustable edge seals do not correspond to the width of the movable print medium, comprising: defining a vacuum chamber and using a vacuum source to provide vacuum in the vacuum chamber; providing spaced sealing rollers in relation to the vacuum chamber that rotate as the print medium moves over each sealing roller to define an opening in the vacuum chamber, wherein the movable print medium passes over the opening and is guided by the sealing rollers; providing the pair of adjustable edge seals between the spaced sealing rollers at a first position; receiving a plurality of response curves for different known print media having different widths, materials, or thickness; selecting appropriate response curves from the plurality of response curves; producing a first signal indicative of the activation level of the vacuum source and a second signal indicative of the vacuum level in the vacuum chamber; and using a controller to compare the first and second signals to the selected response curves to produce an error signal indicating whether the first position of the pair of edge seals does not correspond to the width of the movable print medium.