Ink ribbon cartridge having first and second protrusions to be fitted in first and second holes of frame of printing device, and printing device using the same

An ink ribbon cartridge attachable to a printing device including a first frame, the ink ribbon cartridge comprising:

• a first spool extending in a first direction;
• a first case covering the first spool, the first case having a first end and a first other end opposite the first end in the first direction;
• a second spool extending in a second direction;
• a second case covering the second spool, the second case having a second end and a second other end opposite the second end in the second direction;
• a first rib provided at the first case;
• a second rib provided at the second case;
• an ink ribbon having one end wound over the first spool and another end wound over the second spool, the ink ribbon being arranged to extend, from the one end to the another end, sequentially over the first spool, the first rib, the second rib, and the second spool;
• a first protrusion protruding in the first direction from the first end of the first case, the first protrusion being fitted in a first hole of the first frame inside the printing device in a state where the ink ribbon cartridge is attached to the printing device;
• and
• a second protrusion protruding in the second direction from the second end of the second case, the second protrusion being fitted in a second hole of the first frame in the state where the ink ribbon cartridge is attached to the printing device.