Ink ribbon cassette which can be used in line type thermal transfer printer

An ink ribbon cassette comprising:

• a main body portion accommodating an ink ribbon;
• a supply core and a take-up core which are accommodated in the main body portion so as to be adjacent to each other and around which the end portions of the ink ribbon are wound;
• a ribbon guide portion extending to one side from the main body portion and having on one side a ribbon slide contact surface;
• and
• a ribbon turn-up portion formed at the forward end of the ribbon guide portion,
• wherein the ink ribbon is temporarily drawn out to the exterior from a ribbon outlet formed in the main body portion, runs on the ribbon slide contact surface of the ribbon guide portion from the condition in which it is turned up at the ribbon turn-up portion, and is drawn into the main body portion through an ink ribbon inlet formed in the main body portion to be taken up by the take-up core, and
• wherein the turn-up angle of the ink ribbon turned up at the ribbon turn-up portion is 10 to 80 degrees.

An ink ribbon cassette comprising:

• a main body portion accommodating an ink ribbon;
• a supply core and a take-up core which are accommodated in the main body portion so as to be adjacent to each other and around which the end portions of the ink ribbon are wound;
• a ribbon guide portion extending to one side from the main body portion and having on one side a ribbon slide contact surface;
• and
• a ribbon turn-up portion formed at the forward end of the ribbon guide portion,
• wherein the ink ribbon is temporarily drawn out to the exterior from a ribbon outlet formed in the main body portion, runs on the ribbon slide contact surface of the ribbon guide portion from the condition in which it is turned up at the ribbon turn-up portion, and is drawn into the main body portion through an ink ribbon inlet formed in the main body portion to be taken up by the take-up core, and
• wherein a rotatable guide roller is arranged in the portion of the ribbon outlet with which the ink ribbon comes into contact.

An ink ribbon cassette comprising:

• a main body portion accommodating an ink ribbon;
• a supply core and a take-up core which are accommodated in the main body portion so as to be adjacent to each other and around which the end portions of the ink ribbon are wound;
• a ribbon guide portion extending to one side from the main body portion and having on one side a ribbon slide contact surface;
• and
• a ribbon turn-up portion formed at the forward end of the ribbon guide portion,
• wherein the ink ribbon is temporarily drawn out to the exterior from a ribbon outlet formed in the main body portion, runs on the ribbon slide contact surface of the ribbon guide portion from the condition in which it is turned up at the ribbon turn-up portion, and is drawn into the main body portion through an ink ribbon inlet formed in the main body portion to be taken up by the take-up core, and
• wherein the main body portion comprises:
• a holder member having the ribbon guide portion and holding the supply core and the take-up core;
• and
• a case member capable of holding the holder member by holding a first case and a second case in such a way as to cover from outside the supply core and the take-up core,
• wherein formed on the holder member are a first side wall having a pair of circular bearing portions and a second side wall having a pair of semi-circular bearing portions,
• wherein the second case of the case member has in the portion thereof opposed to the second side wall a third side wall having a pair of semi-circular bearing portions,
• wherein one end portions of the supply core and the take-up core are rotatably supported by the circular bearing portions of the first side wall of the holder member, and
• wherein the other end portions of the supply core and the take-up core are rotatably supported by the semi-circular bearing portions of the second side wall of the holder member and the third side wall of the second case.

An ink ribbon cassette comprising:

• a main body portion accommodating an ink ribbon;
• a supply core and a take-up core which are accommodated in the main body portion so as to be adjacent to each other and around which the end portions of the ink ribbon are wound;
• a ribbon guide portion extending to one side from the main body portion and having on one side a ribbon slide contact surface;
• and
• a ribbon turn-up portion formed at the forward end of the ribbon guide portion,
• wherein the ink ribbon is temporarily drawn out to the exterior from a ribbon outlet formed in the main body portion, runs on the ribbon slide contact surface of the ribbon guide portion from the condition in which it is turned up at the ribbon turn-up portion, and is drawn into the main body portion through an ink ribbon inlet formed in the main body portion to be taken up by the take-up core, and
• wherein the main body portion comprises:
• a holder member having the ribbon guide portion and holding the supply core and the take-up core;
• and
• a case member capable of holding the holder member by holding a first case and a second case in such a way as to cover from outside the supply core and the take-up core,
• wherein formed on the holder member are a first side wall having a pair of circular bearing portions and a second side wall having a pair of semi-circular bearing portions,
• wherein the second case of the case member has in the portion thereof opposed to the second side wall a third side wall having a pair of semi-circular bearing portions, and has in the portion opposed to the second side wall a fourth side wall having a pair of semi-circular bearing portions,
• wherein one end portions of the supply core and the take-up core are rotatably supported by the bearing portions of the first side wall and the third side wall, and
• wherein the other end portions of the supply core and the take-up core are rotatably supported by the bearing portions of the second side wall and the fourth side wall.