Sheet conveying device, automatic document feeder, and image forming apparatus

A sheet conveying device comprising:

• a housing;
• an opening unit including a group of rotators to openably close the housing, the group of rotators to convey a sheet to a given position, wherein the group of rotators is opened to open a conveyance passage from a first position upstream of the given position to a second position downstream of the given position, the group of rotators including:
• a first driven rotator to convey the sheet to the given position, the first driven rotator including:
• first driven rollers at end region of an axis of the first driven rotator, the axis of the first driven roller being a first axis;
• and
• a second driven roller at a center region of the first axis,
• a second driven rotator to convey the sheet after the sheet passes through the given position, the second driven rotator including:
• third driven rollers at each end region of an axis of the second driven rotator, the axis of the third driven rollers being a second axis;
• and
• a fourth driven roller at a center region of the second axis;
• and
• a drive rotator to form a conveyance roller pair with the first driven rotator to convey the sheet,
• wherein the second driven roller has an outer diameter greater than each of the first driven rollers.