| 摘要 |
An aligning device for a printing member in a printer in which it is presupposed to use a printer of a one-end supporting structure. The printing member, such as a thermal transfer ribbon 3, can be used by selecting one of center alignment and one-end alignment. A rack and pinion structure within a cylindrical shaft 22 includes a pinion 16 rotatably provided within the cylindrical shaft 22, a pair of racks 17 and 18, a push-in projection 19 configured to push one rack 17 toward the push-in end 22B of the cylindrical shaft 22. A positioning projection 20 is configured to detachably engage with any of a plurality of positioning engagement holes 26 defined in the cylindrical shaft 22 along an axial direction. The push-in projection 19 drives the racks 17 and 18 and the pinion 16 by the pushing of the core tube 21 to the cylindrical shaft 22, and the positioning projection 20 engages with one of the positioning engagement holes 26 in the cylindrical shaft 22, to position the core tube 21 at the central position across the width direction.
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