| 摘要 |
The device has a spool displacing a mobile core (30) threaded on a shaft (20). The core has two hubs (31, 32), where the hub (31) with larger diameter is supported on a stop to drive the shaft and the hub (32) with smaller diameter include a groove (34) to position the shaft in one stable position. The core has a recess (33) placed between the hubs and supported against fixed parts, to position the shaft in another position.
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