| 摘要 |
A thermal head is supported by a head arm which can move between a position where it is close to a platen and a position where it is apart from the platen. The thermal head is configured such that it can move between a printing position where a sheet and an ink ribbon are pushed against the platen and a retracted position where the ink ribbon is spaced from the platen sot that the ink ribbon is spaced from the sheet. The thermal head moves between the printing position and the retracted position by a cam mechanism, for example. Such a mechanism is effective, for example, in allowing only a sheet to feed, preventing wasteful feeding of an ink ribbon.
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