Importance

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Abstract

A slide is vertically movable in a press frame and supports the upper die. A threaded main spindle is operative between the press frame and the slide. A clutch disc connected rationally rigidly to the spindle is connectable by friction contact to a driven disc flywheel for the operating stroke of the slide. Piston-cylinder units act between the press frame and the slide for returning the slide to the starting position. The spindle is axially clamped between two spring columns, one of which acts between one end of the spindle and the slide and the other of which acts between the other end of the spindle and a counter thrust bearing axially fixed in the press frame. An auxiliary spindle, of approximately the same lead but with a smaller diameter, engages in an internally threaded bore in the main spindle and is disposed between the corresponding end of the main spindle and the corresponding spring column in order to compensate the relative axial movement between the axially fixed main spindle and the axially movable slide or between the main spindle axially movable with the slide and the counter thrust bearing held axially movably but rotationally rigidly in the slide or on the counter thrust bearing against the force exerted upon it by the spring column.

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First Claim