Abstract: The present invention relates to a method for providing paper stack level calibration in a reproduction apparatus. According to various aspects of the invention, methods are provided for continuous feeding with a transition from one supply to another, and leaving a controlled number of sheets in the prior supply.

Abstract: According to an aspect of the invention an adjustable sheet feeder for use in an apparatus for feeding sheets from the top of a sheet supply stack is shown. The sheet supply stack has a center and marginal edges, each having a top. The adjustable sheet feeder comprises a sheet supply stack support, a sheet feed head assembly, a curl sensing device which senses the position of the stack edges relative to the position of the stack center top and provides feedback, an adjustment device, and a feed back display which displays the curl sensing device feedback. The adjustment device adjusts the position of the stack center top relative to the position of the stack marginal edges top based on the curl sensing device feedback.

Abstract: A method of operating a vacuum corrugated belt feeder during a feed cycle wherein the paper is taken away by a belt which is activated when a feed clutch is energized, and wherein the vacuum is actuated at the start of the feed cycle and de-actuated prior to, or at the same time as the feed clutch is de-energized. According to an aspect of the invention the improvement comprises pulsing the positive air pressure separator by actuating and de-actuating the positive air pressure separator during the feed cycle, and pulsing the high pressure separator by actuating and de-actuating the high pressure separator during the feed cycle.