Belt conveyance device, sheet feeding device, image forming apparatus, and image forming system

A belt conveyance device comprising:

• an endless belt;
• a duct having a suction port, the duct surrounded by an inner circumferential surface of the endless belt;
• and
• a rectifier inside the duct, extending in a width direction of the endless belt perpendicular to a direction of conveyance by the endless belt,
• wherein the rectifier partitions an internal space in the duct into an upstream compartment and a downstream compartment in the direction of conveyance,
• the belt conveyance device further comprising another rectifier in at least one of the upstream compartment and the downstream compartment to rectify a direction of airflow flowing through the suction port toward one end of the duct in the width direction,
• wherein said another rectifier includes a plurality of rectifiers,
• wherein at least one of the plurality of rectifiers partitions the at least one of the upstream compartment and the downstream compartment into a plurality of regions,
• wherein each of the plurality of rectifiers includes a corner having a curvature to rectify the direction of the airflow flowing through the suction port toward the one end of the duct in the width direction, and
• wherein the corner of each of the plurality of rectifiers has a same shape.