| 摘要 |
This invention provides a device for exerting a force on a component of a printing press, comprising a force-exerting element and actuating means for said element, the arrangement being such that the force exerted by the said element is controllable by means of a control apparatus at a desired but adjustable value. More specifically, in one form of device in accordance with the invention the force-exerting element comprises a stalled electric motor wherein those components which move in relation to one another are, for a given input to the motor, and at least within a predetermined range of relative movement of the said components, subjected to a constant force produced by the motor or to a constant torque produced by the motor. Fluid pressure force generation is also disclosed. The control circuits for either electromagnetic or fluid pressure devices may include feedback. <IMAGE> |
