| 摘要 |
A printer, equipped with a set of rotating sprockets 12 for driving a print medium 6, these sprockets being retractable under the action of cam means 11, 13 in line with a predetermined zone of their trajectory (for example facing the path of a print head 7) is further arranged so that during the loading of the print medium, the sprockets are retracted in the insertion zone of the said print support, but project in a zone which the operator can see for easy engaging of this medium. <IMAGE>
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