Apparatus and method for controlling the slope angle of sheet stock in a feeder/loader for copying/printing where leading edge side of the stock is elevated by elevating one side of the support tray to position the top sheet for nudging into a nip. When the slope angle of the stock reaches a critical value, in one version, a separate elevating mechanism raises the opposite side of the support tray to prevent the slope angle from exceeding the critical value. In another version, the elevating mechanism for the opposite edge is connected to the elevating mechanism for the leading edge of the stack and raises the opposite edge when the sheet stock slope angle reaches a threshold value to prevent potential misfeed.