Roll paper unit having paper path switching member and image forming apparatus employing the same

An image formation apparatus for forming an image selectively on either roll paper or a cut paper sheet, comprising:

• a cassette for holding plural ones of cut paper sheets prior to formation of an image thereon, and
• a roll paper unit for holding roll paper incorporated demountably into the main body of the image formation apparatus,
• the roll paper unit having a cutter for cutting the roll paper,
• a registration roller for delivering the roll paper sheet at a predetermined timing to the image formation section,
• a reversal-preventing member for preventing reverse movement of the registration roller, and
• the roll paper unit unwound the roll paper when the roll paper unit is demounted from the main body with the roll paper held by the registration roller.

An image formation apparatus for forming an image selectively on either roll paper or a cut paper sheet, comprising:

• a roll paper unit for holding roll paper, incorporated demountably into the main body of the image formation apparatus,
• a cassette for storing plural ones of the cut paper sheets before formation of an image thereon,
• a paper delivery path for delivering the cut paper sheets stored in the cassette, being opened when the roll paper unit is demounted from the main body of the image formation apparatus,
• a registration roller for delivering the roll paper sheet at a predetermined timing to the image formation section,
• a reversal-preventing member for preventing reverse movement of the registration roller, and
• the roll paper unit unwound the roll paper when the roll paper unit is demounted from the main body with the roll paper held by the registration roller.