| 摘要 |
Variable speed stepwise power feed device for a programmer of the class comprising motor means, a cam unit integral with a ratchet iron wheel on which a feed pawl can act which is actuated by an eccentric from said motor means, the engagement of said pawl with said ratchet iron wheel being controlled by a disengaging cam, the improvement which consists in that said disengaging cam is integral in rotation with a star wheel wedged on an axis turning freely in a bearing, said axis being free to move, from a non-meshing position, so as to bring the star wheel more or less near a plate driven into continuous rotation from said motor means and comprising two sets of wedges arranged concentrically on said plate so that the star wheel depending on the degree of approach with respect to said plate, meshes with the nearest set of wedges or simultaneously with the two nearest sets of wedges and is driven at different speeds. |
