| 摘要 |
<p>A device is disclosed for feeding sheets to a sheet processing machine, such for example, as to a folding and pasting machine. The novel feeding mechanism includes at least one conveyor having at least one endless belt. The endless belts are intermittently advanced to carry one sheet at a time taken from a pile disposed above the belt or belts. The intermittent advancement of the belt or belts is brought about through a one-way clutch coupling a drive pulley to a crank arm which is oscillated back and forth through a link mechanism driven by a continuously rotating drive wheel. The machine to which the sheets are successively fed includes a pair of pressure feed rollers to which the leading edge of each sheet is moved. After the sheet is grasped by the feed rollers, further movement of the sheet continues the advancement of the belt while the belt drive roller is free-wheeling. The belt has a large number of perforations and a vacuum chamber is located below the belt over a region representing a substantial forward portion of the pile of sheets.</p> |
