Patent ID: 9233559
Filing Date: 2016-01-12
CPC Classification: B41J

Claim Text:
1. Apparatus for causing a vacuum force to be applied at a target vacuum level across a width of a web of movable print medium as it moves through a printing system and for determining whether positions of adjustable edge seals of the apparatus do not correspond to edge positions of the movable print medium, comprising: a vacuum chamber connected to a vacuum source, wherein the vacuum source provides vacuum to the vacuum chamber; spaced sealing rollers, disposed in relation to the vacuum chamber, that rotate as the print medium moves over each sealing roller, wherein the spaced sealing rollers define an opening in the vacuum chamber, and wherein the movable print medium passes over the opening and is guided by the sealing rollers; the adjustable edge seals disposed between the spaced sealing rollers at a first position; a sensor for measuring a vacuum level in the vacuum chamber; and a controller having controller accessible memory for storing a plurality of response curves for different known print media having different widths, materials, or thickness, responsive to the vacuum source and the sensor, for producing a first signal indicative of an activation level of the vacuum source and a second signal indicative of the vacuum level in the vacuum chamber, and for comparing the first and second signal to appropriate response curves corresponding to the movable print medium 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.