| 摘要 |
The device allows the automatic opening and closure of a cutting blade (1). For the opening and closing functions the device has two distinct levers (6 and 7).The two levers are connected on a support (5) and fixed to the principal spring (4). The levers drive in rotation two helicoidal ramps (8,9) recalled to an initial position by two springs (10,11). The ramps raise the principal spring (4) which holds the blade in two positions, open and closed.
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