Abstract: A printer using a thermal head to sublime ink on an ink ribbon includes a cylindrical ribbon core around which the ink ribbon is wound, a rotating shaft to rotate the ribbon core, first and second magnets to generate magnetic force lines in a space surrounded by an inner peripheral face of the ribbon core, and a magnet sensor located in the space to detect the magnetic force lines generated by the first and second magnets only when the magnetic force lines are set in prescribed directions by rotation of the ribbon core. The ribbon core includes a cylindrical outer core with an outside peripheral surface around which the ink ribbon is wound and a cylindrical inner core with an outside peripheral surface to which the first and second magnets are fixed. The inner core with the first and second magnets fixed thereto is installed inside the outer core.

Abstract: A printer using a thermal head to sublime ink on an ink ribbon includes a cylindrical ribbon core around which the ink ribbon is wound, a rotating shaft to rotate the ribbon core, first and second magnets to generate magnetic force lines in a space surrounded by an inner peripheral face of the ribbon core, and a magnet sensor located in the space to detect the magnetic force lines generated by the first and second magnets only when the magnetic force lines are set in prescribed directions by rotation of the ribbon core. The ribbon core includes a cylindrical outer core with an outside peripheral surface around which the ink ribbon is wound and a cylindrical inner core with an outside peripheral surface to which the first and second magnets are fixed. The inner core with the first and second magnets fixed thereto is installed inside the outer core.

Abstract: Magnetic force lines 51 are generated in the direction from a first limited portion 52 of an inside peripheral face 50a of a ribbon-delivering cylindrical core 50 toward an opposing second limited portion 54. A first magnet is fixed at the first limited portion: a second magnet is fixed at the opposing second limited portion. With the ink ribbon cassette 40 set in a main body of a printer 10, a magnetic sensor 24 takes the position in the middle of the inside of the ribbon-delivery core 50, and detects the magnetic force line 51.

Abstract: An ink ribbon cassette in which an ink ribbon used to form an image on a print medium is stored includes a cylindrical ribbon core around which the ink ribbon is wound, and a first magnet and a second magnet each configured to generate a magnetic force line in a space of the ribbon core. The ribbon core includes a cylindrical outer core and a cylindrical inner core inserted inside the cylindrical outer core. The inner core has an outside peripheral surface to which the first and second magnets are fixed, and an inner peripheral surface for forming the space where the magnetic force line is formed. The outer core has an outside peripheral surface around which the ink ribbon is wound, and an inner peripheral surface to which the outside peripheral surface with the first and second magnets fixed thereto is installed.

Abstract: Magnetic force lines 51 are generated in the direction from a first limited portion 52 of an inside peripheral face 50a of a ribbon-delivering cylindrical core toward an opposing second limited portion 54. A first magnet is fixed at the first limited portion: a second magnet is fixed at the opposing second limited portion. With the ink ribbon cassette 40 set in a main body of a printer 10, a magnetic sensor 24 takes the position in the middle of the inside of the ribbon-delivery core 50, and detects the magnetic force line 51.

Abstract: Magnetic force lines 51 are generated in the direction from a first limited portion 52 of an inside peripheral face 50a of a ribbon-delivering cylindrical core 50 toward an opposing second limited portion 54. A first magnet is fixed at the first limited portion: a second magnet is fixed at the opposing second limited portion. With the ink ribbon cassette 40 set in a main body of a printer 10, a magnetic sensor 24 takes the position in the middle of the inside of the ribbon-delivery core 50, and detects the magnetic force line 51.