Patent ID: 8568044

Claim:
An ink ribbon cartridge comprising: a supply spool, on which an ink ribbon is wound and which is formed at one end portion with a driving hole, with which a driving shaft of a printer apparatus is engaged; a winding spool which takes up the ink ribbon sent from the supply spool and which is formed at one end portion with a driving hole, with which a driving shaft of the printer apparatus is engaged; and a cartridge main body which has a supply-side ribbon housing section which houses the supply spool so as to be able to rotate about a supply spool axis, and a winding-side ribbon housing section which houses the winding spool so as to be able to rotate about a winding spool axis, and in which a head entry opening portion, into which a thermal head enters, is formed between the supply-side ribbon housing section and the winding-side ribbon housing section, and opening portions for the ribbon, which make the ink ribbon extend in the head entry opening portion, are formed on the head entry opening portion side of the supply-side ribbon housing section and the head entry opening portion side of the winding-side ribbon housing section, wherein in the cartridge main body, an insertion concave portion and a concave guide portion form a structure centrally disposed between and interconnecting the supply-side ribbon housing section and the winding-side ribbon housing section, the insertion concave portion and concave guide portion being separated from one another by a divider wall such that the insertion concave portion defines an insertion concave portion space forming an insertion concave portion opening into a top side and an insertion side of the cartridge main body and the concave guide portion defines a concave guide portion space forming a concave guide portion opening into a bottom side and the insertion side of the cartridge main body, the bottom side being opposite the top side, the concave guide portion acting when mounting the cartridge on a mounting section of the printer apparatus in the insertion direction into the printer apparatus is formed, the concave guide portion spanning the cartridge main body generally in a direction parallel to the supply spool axis and winding spool axis between an insertion face side and a positioning face side, and a projection portion, configured as a stub shaft, is connected to and projects from the divider wall into the concave guide portion space and is disposed at a corner section of the concave guide portion in the insertion concave portion space, the corner section being defined, in part, by the bottom side and the insertion side of the cartridge main body.