Sheet feeding device, image forming apparatus incorporating the sheet feeding device, and image forming system incorporating the sheet feeding device

A sheet feeding device comprising:

• a sheet loader, configured to receive a bundle of sheets;
• an air drawing body configured to generate suction air;
• an attracting and conveying device configured to attract a sheet, the sheet being an uppermost sheet of the bundle of sheets, by the suction air and configured to convey the sheet;
• an air duct configured to intake the suction air generated by the air drawing body, to the attracting and conveying device;
• and
• a blocking device configured to block the suction air in the air duct,
• wherein the air duct includes a wall including a leak hole passing through an inside of the air duct and an outside of the air duct,
• wherein, when the suction air is blocked by the blocking device, the leak hole becomes open, and,
• wherein, when the suction air is not blocked by the blocking device, the leak hole is closed by the blocking device.

A sheet feeding device comprising:

• a sheet loader, configured to receive a bundle of sheets;
• an air drawing body configured to generate suction air;
• an attracting and conveying device configured to attract a sheet, the sheet being an uppermost sheet of the bundle of sheets, by the suction air and configured to convey the sheet;
• an air duct configured to intake the suction air generated by the air drawing body, to the attracting and conveying device;
• a blocking device configured to block the suction air in the air duct;
• a lower air drawing body configured to attract the sheet by a lower suction air directing to the sheet loader;
• a lower air drawing air duct configured to pass the lower suction air drawn by the lower air drawing body;
• and
• a lower suction air opening and closing device configured to block the lower suction air in the lower air drawing air duct and configured to pass the lower suction air in the lower air drawing air duct.

A sheet feeding device comprising:

• a sheet loader, configured to receive a bundle of sheets;
• an air drawing body configured to generate suction air;
• an attracting and conveying device configured to attract a sheet, the sheet being an uppermost sheet of the bundle of sheets, by the suction air and configured to convey the sheet;
• an air duct configured to intake the suction air generated by the air drawing body, to the attracting and conveying device;
• a blocking device configured to block the suction air in the air duct;
• a controller configured to control the sheet feeding device, the controller being configured to block the suction air by the blocking device upon completion of conveyance of the sheet by the attracting and conveying device;
• and
• an indicator configured to indicate a working state of the sheet feeding device,
• wherein the indicator is configured to turn on and off light, and
• wherein, at a set time passed since the suction air in the air duct is shut down by the blocking device, the controller is configured to turn off the indicator.