Patent ID: 9315347
Filing Date: 2016-04-19
CPC Classification: B65H

Claim Text:
1. A sheet supply device comprising: a sheet supply tray on which a sheet bundle to be fed is placed; a delivery roller that can be freely elevated or lowered and contacts a topmost surface of the sheet bundle on the sheet supply tray to deliver a topmost sheet of the sheet bundle; an elevating tray that can be freely elevated or lowered and supports a leading end side of the sheet bundle placed on the sheet supply tray; a first drive section that elevates or lowers the elevating tray; a second drive section that elevates or lowers the delivery roller; a controller that controls drive of the first and second drive sections; and a top surface detection device having a top surface position detection lever swingably arranged above the elevating tray and contacting the topmost surface of the sheet bundle to detect a position of the topmost surface of the sheet bundle on the sheet supply tray, wherein in feeding the sheet from the sheet supply tray, when the top surface detection device detects a state wherein the topmost surface of the sheet bundle on the sheet supply tray is positioned below a delivery position to feed the topmost sheet toward a downstream side of the elevating tray, the controller controls the first drive section and the second drive section to elevate the elevating tray until the topmost surface of the sheet bundle on the sheet supply tray reaches the delivery position and thereafter, to lower the delivery roller to a position to contact the topmost surface of the sheet bundle.