| 摘要 |
<p>The invention relates to a device comprising: a perforated plate (4) with a plurality of drillings; at least one pin (5, 15, 25, 25, 35, 45, 55, 65, 75, 85) projecting through a drilling in the perforated plate (4) and axially movable; an electromagnetic actuator (6, 16, 66, 116) to move the pin (5, 15, 25, 25, 35, 45, 55, 65, 75, 85). A simplified structure is obtained by the fact that the pin (5, 15, 25, 25, 35, 45, 55, 65, 75, 85) has at least two stable positions in which it is held by the force of a permanent magnet (5e, 5g, 5j, 8, 55c, 67). The pin (5, 15, 25, 25, 35, 45, 55, 65, 75, 85) does not project from the corresponding drilling in the perforated plate (4) when in a stable position.</p> |
