| 摘要 |
<p>There is described herein a commutator feeding-device for an air distributor, comprising a transducer apt for controlling the movement of a shutter-element for feeding prefixed quantities of air into a chamber (3) of said distributor, successive to a pressure variation taking place inside said chamber, said transducer being activated following the shifting of a deformable membrane. The device comprises a spring (15), disposed inside a small-piston (16), apt for resting on said membrane, said small-piston being provided with radial stakes (18) - each one of which is apt for resting on the active surface of a corresponding helicoidal-profile cam (20), with manually operable actioning-means being predisposed for controlling the rotation of said small-piston around its own axis - and hence, the axial shifting of the small-piston itself, in the spring compressing sense.</p> |
