Two-speed linear actuator driven by two motors

A bending press comprising a support, a blade and a die and a linear actuator comprising:

• first and second bodies mounted for sliding relative to each other and interconnected by means of prismatic guides extending parallel to a working line,
• a male-and-female screw mechanism in which the male screw and the female screw are supported for rotation by the first and the second body, respectively,
• first and second motors for alternately rotating with substantially different rotational speeds the male screw and the female screw, respectively, and
• a braking device associated with the member of the male-and-female screw mechanism, which is driven with the higher rotational speed, wherein:
• a) the motors are associated with respective speed-reduction devices having substantially different reduction ratios,
• b) each of said bodies has a base portion and a pair of diametrally-opposed elongated members bearing said guides and projecting from the base portion towards the base portion of the other body, in a direction parallel to said working line,
• c) the base portion of said second body has a through hole in which a hollow sleeve is rotatably supported, the sleeve projecting from the base portion of the second body towards the first body in a direction parallel to said working line and bearing the female screw,
• d) the male screw is cantilevered by the base member of the first body and projects towards the second body, a first end of the male screw being rotatably connected to the first body and a second end extending within said hollow sleeve,
• e) the braking device includes disc brake comprising a disc fixed to a gear fixed to said member of the male-and-female screw mechanism which is driven with the higher rotational speed.