Sheet feeding device, image forming apparatus incorporating the sheet feeding device, and device attachment body of the sheet feeding device

An image forming apparatus, comprising:

• a sheet feed tray including a housing configured to accommodate a flap envelope as a sheet and a side fence configured to regulate a position of the flap ennvelope in a width direction of the flap envelope;
• a sheet feed roller configured to feed the flap envelope;
• a sheet guide above the flap envelope and configured to regulate movement of the flap envelope in an upper direction;
• and
• a separator configured to prevent a subsequent flap envelope other than the flap envelope which is fed by the sheet feed roller, from moving in a sheet conveying direction and to separate the subsequent flap envelope from flap envelope,
• wherein the sheet feed tray is detachbly attachable to an apparatus body of the image forming apparatus while leaving the sheet guide in the apparatus body of the image forming apparatus.

An image forming apparatus, comprising:

• a sheet feed tray including a housing configured to accommodate a flap envelope as a sheet and a side fence configured to regulate a position of the flap envelope in a width direction of the flap envelope;
• a sheet feed roller configured to feed the flap envelope;
• and
• a sheet guide above the flap envelope and configured to regulate movement of the flap envelope in an upper direction,
• wherein the sheet feed tray is detachably attachable to an apparatus body of the image forming apparatus while leaving the sheet guide in the apparatus body of the image forming apparatus,
• wherein the sheet guide includes a contact part configured to contact a surface of the flap envelope,
• wherein the sheet guide is rotatably supported by the apparatus body of the image forming apparatus,
• wherein the contact part is configured to move up and down as the sheet guide rotates.