Roll sheet holder and tape printer

A roll sheet holder which holds a roll sheet wound on a cylindrical sheet core having a through hole opening at both ends and is removably mountable in a tape printer which includes a feeding device which draws the roll sheet to feed an unwound part thereof, and a printing device which prints on the part of the roll sheet fed by the feeding device, wherein

• the tape printer comprises:
• an insertion opening through which the unwound part of the roll sheet is inserted in the tape printer;
• a positioning support member vertically provided in a side end of a bottom of the tape printer so that one side of the positioning support member is positioned substantially in one plane with one side end of the insertion opening;
• a first positioning groove which is formed in the positioning support member to open upward and at both sides in a direction of a width of the tape printer;
• a placing part provided upstream from the insertion opening in a sheet feeding direction;
• and
• a second positioning groove which is formed on an upper side of the placing part to open rearward in the sheet feeding direction;
• the roll sheet holder comprises:
• a guide member which is arranged in contact with one end of the roll sheet and has a front-side extended portion extending outwards so that a front end of the front-side extended portion is positioned outside a front end of the roll sheet of a maximum diameter in the sheet feeding direction;
• and
• a positioning holding member which is arranged in contact with the other end face of the roll sheet and has a positioning rib provided protruding in a longitudinal shape on an outer surface of the positioning holding member at a substantially center of a width thereof, the positioning rib being fitted in the first positioning groove when the roll sheet holder is mounted in the tape printer, thereby positioning the roll sheet holder in place in the tape printer.