| 摘要 |
A printer having a platen mounted on a shaft rotatably and a line indexing driving gear with a releasable clutch mechanism which couples selectively the platen and driving gear for line-by-line indexing or manual indexing of the platen. The clutch mechanism includes a first clutch means fixed on the shaft and a second clutch means which is moveable along the shaft with a knob. The driving gear mounted on the shaft rotatably engages with the second clutch.
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