| 摘要 |
PURPOSE:To realize high grade printing quality generating no printing omission or contamination by correcting the non-uniformity of tension in an orthogonal direction and eliminating the skew of an ink ribbon or winding disturbance, by supporting a guide roller for guiding an ink ribbon in a state rotatable and tiltable on the rotary center axis thereof. CONSTITUTION:At the time of printing operation, the ink ribbon 5 delivered from an ink ribbon pan cake 1 and guided by a guide roller 3 is fed while pressed to recording paper between a thermal head and a platen roller under pressure and taken up by a take-up core 2 but inclined to the direction shown by an arrow A with respect to the rotary center O of the guide roller 3 corresponding to the non-uniformity of tension in the direction at right angles to the running direction of the ink ribbon 5 generated at the time of taking-up and the distance between the rotary center axis Z-Z' and the outer periphery of the guide roller contacted with the ink ribbon is changed along the direction of the rotary center axis Z-Z' corresponding to the non-uniformity of tension in the direction orthogonal to the running direction of the ink ribbon and, by this mechanism, the non-uniformity of tension is corrected. |
