Patent ID: 7464925

Claim:
An adjustable sheet feeder in an apparatus for feeding sheets from the top of a sheet supply stack, wherein the sheet supply stack has a center having a stack center top, and marginal edges having a stack edges top, the adjustable sheet feeder comprising; a sheet supply stack support comprising an air bladder, wherein the sheet supply stack support has a center portion and an edge portions, wherein said sheet supply stack center portion is moveable relative to said sheet supply stack support edge portions; a sheet feed head assembly; a curl sensing device which operates to sense the position of the stack edges top relative to the position of the stack center top, wherein said curl sensing device provides feedback; an adjustment device to adjust the position of the stack center top relative to the position of the stack marginal edges top to place the stack center top in a predetermined proper position relative to sheet marginal edges top based on said feedback by moving said said sheet supply stack support center portion relative to said sheet supply stack edge portions by adjusting the amount of air in said air bladder; an indicator, which operates to signal when the stack center top is not within the predetermined proper position relative to the marginal edges top; and a feedback display, which operates to display said curl sensing device feedback, such that adjustments may be made based on said curl sensing device feedback.