| 摘要 |
Disclosed are printers capable of easy and precise head gap adjustment. In the printer, a cam mechanism 61 consisting of a fixed cam 62 and a rotatable cam 63 put between each end of a platen 10 and a swing frame 4. The platen 10 is normally biased to the swing frame 4 by a torsion coil spring 14. A driving gear 64 rotatably supported on the swing frame 4 is engaged with a driven gear 63a formed on the rotatable cam 63. The driving gear 64 is rotated by an operating tool 66 inserted from above, whereby the rotatable cam 63 is rotated by gear drive. In accordance with the rotation of the rotatable cam 63, the platen 10 vertically moves with the fixed cam 62, whereby head gap with respect to a printing head is adjusted. The driving gear 64 can be unrotatable by securing a screw 65 as a rotatable axis thereof by operation from above, whereby the platen 10 is secured.
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