Patent ID: 7686294

Claim:
A sheet tray module adapted to be mounted on a vertical repositioning elevator tray, said module comprising: a stack supporting pivotal tray having a slot which is enabled to be pivoted in response to vertical movement of said repositioning elevator tray; a base unit, wherein said stack supporting pivotal tray is pivotally connected at one side to said base unit at a pivot point, and said base unit rests on top of said vertical repositioning elevator tray; movable linkages on both sides of said stack supporting pivotal tray, said linkages connected on one end to a fixed pivot position of said module and at its opposite end movably positioned in said slot in said stack supporting pivotal tray; an adjustable position fixed pivot pin on the base unit that intermediately engages with said movable linkage; and a paper or media feed head enabled to contact a top sheet in a stack of media sheets; a stack height sensor enabled to sense a height of said stack; a controller in contact with both said repositioning elevator tray and said paper feed head and provide vertical repositioning movement of said elevator tray and thereby enabled to automatically change a tilt angle of said stack supporting pivotal tray in said stack thickness, said stack supporting pivotal tray enabled to fully and uniformly support a stack of uneven thickness media sheets without bending, said stack supporting pivotal tray comprising an automatic tilting system to automatically tilt said stack supporting pivotal tray downwardly under a thicker first media area and upwardly under a thinner opposing second media area, a tilt angle of said stack supporting pivotal tray increases automatically in response to an increase in a thickness of an uneven thickness print media sheets stacked on said stack supporting pivotal tray.