Patent ID: 8113501

Claim:
A sheet supply device, comprising: a sheet storing section on which sheets are stacked and are stored; a sheet feed unit controlled by a controller that feeds the sheets stored in the sheet storing section; and an air blower controlled by the controller that blows air to the sheets stored in the sheet storing section, the air blower has an air nozzle and a mechanism that can adjust a height of the air blower together with the air nozzle in an up-down direction, wherein the air nozzle is repeatedly moved up and down relative to the topmost sheet in feeding cycles and the sheet feed unit feeds the sheets in synchronization with the up-down movement such that the feeding of the sheets begins when the air nozzle is in the highest position, and wherein a force provided by the air blower to push up the sheets is exerted on the sheets, such that less force is exerted when the sheets are being fed compared to when the sheets are not being fed.