| 摘要 |
PURPOSE:To prevent an ink ribbon from being insufficiently wound by providing a structure wherein one of a pair of rollers for winding the ink ribbon is rotatably supported by a holder, controlling the displacement of the holder by a cam, and maintaining or releasing the pressing contact condition of a pair of rollers. CONSTITUTION:When an ink ribbon 13 is wound, a cam 4 is slided toward the projection 9 of a holder 3 by a knob 11. At this time, the pressing portion 12 of the cam 4 moves over the projection 9 of the holder 3 to move on the holder 3 in contact therewith, and rotate the holder 3 in a direction toward a urethane roller 1. As a result, another urethane roller 2 is moved toward the roller 1 while being held by the holder 3 and brought into contact with the roller 1 to press it. Accordingly, by holding the pressing portion 12 in a condition wherein it has moved over the projection 9, the ink ribbon 13 can be wound by the rollers 1 and 2. Since, after the winding of the ink ribbon 13 is terminated, the cam 4 is returned to an original position and the rollers 1 and 2 are released from the contact condition, there is no deformation on their contact surfaces.
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