| 摘要 |
<p>The sealing mechanism screws a plastics cap onto the neck of a bottle having a clutch breaking the drive to the screwing head when a predetermined torque is reached. The clutch has a driving plate (11) and a driven plate (13) clear of it and coupled to the screwing head (1). In the surface of the plates towards each other are permanent magnets (12, 14), whose poles are so arranged as to pull the plates towards each other in at least one relative position.</p> |
