| 摘要 |
<p>1. Cassette for printed ribbon for a typewriter, constituted by a case (1) including a supply spool (4) on which the ribbon (6) is wound on and a receiving spool (5) engageable with drive means (7) and intended to receive the used ribbon, break means (31) for the supply spool (4) to produce a tension of the ribbon between the two spools, this cassette comprising a blocking mechanism (25) of the receiving spool (5) intended to prevent the unwinding of this spool, when the cassette is withdrawn from the typewriter, this mechanism comprising a blocking lever (26) with a nose (27) which enters elastically in direct contact with the teeth (28) of a toothed wheel (29), characterized in that the toothed wheel (29) is integral with the receiving spool (5) and in that the blocking lever (26) is in one piece with the case (1), this lever (26) comprising a portion freely exposed in order to work with a device (30) adapted to disengage said nose (27) from the teeth (28) when the cassette is mounted on the typewriter.</p> |
