Abstract: An arrangement for changing the lever ratio of a two-armed rocker lever, particularly for the transfer movements in a press. The rocker lever is pivotally connected in a lever arm and the starting movement is capable of being tapped by another lever arm. This arrangement includes a frame, a slide guide for the rocking bearing of the rocker lever, a control device, a rotation transmission device and a nut-spindle connection for the sliding movement of the slide guide relative to the rocker lever. The rocker lever, by means of the slide guide, is disposed in a pivot bearing of a support. The support is slidably guided in the frame. The support includes the nut of the nut-spindle connection for interacting with the spindle. The control device, rotation transmission device and the spindle are arranged in the frame, and a device for fixing the position of the pivot bearing in the rocker lever is connected with the rocker lever in an operatively connected manner.

Abstract: A press having a drawing apparatus has a sheet metal part that is drawn in the drawing stage. This sheet metal part is to be taken over by a transfer device in a stage of the upward movement of the drawing apparatus that is as early as possible in order to utilize the long time period of the upward movement of the slide for the transfer movement. After the drawing, passing through the lower dead center of the slide movement and the drawing apparatus movement, the sheet metal holder is temporarily stopped in a removal position and is therefore temporarily prevented from continuing to move upward.

Abstract: A drawing apparatus in drawing stages of a press, having a pressure cheek divided into segments, to the corner areas of which pressure cylinders are applied. The pressure cylinders are fixed to the press. Their piston rods, by way of pressure rods, act upon a liftable and lowerable console. At least one locking cylinder which is fixed to the frame is provided which, by way of a lift bridge, is applied to the console and, corresponding to the pressure which acts upon it, prevents an upward movement of the console and thus of the pressure cheek. The point in time of the stop stage in the upward-moving stage can be determined by the valve control of the pressure in the locking cylinders.

Abstract: In the case of a drive for a male-die-side ejector slidably disposed in a slide of a mechanical metal-forming press having an angle lever which is pivotably disposed at the slide, one leg of the lever acting upon the end of the ejector facing way from the male die and the other leg thereof being acted upon by a control cam which is driven in a timed manner and being held in contact with this control cam, a free adjustability of the moving characteristics of the ejector is achieved in that the control cam is provided at a control carriage which is slidable in a guide fixed at the frame in parallel to the moving direction of the slide, and at which a control connecting rod is applied in a bearing, this control connecting rod, at one end, being disposed eccentrically on a shaft serving also as the drive of the slide.

Abstract: A press drive with a central cam shaft actively connected through a connecting rod with a slide guided in a linear guide. Side bars are symmetrically articulated with respect to each other on the slide. Mass balancing weights are driven in opposed directions corresponding to reciprocating masses of the press, with the weights being connected with the slide by other linkages. Pairs of toggle joint linkages are disposed symetrically with respect to the cam shaft. The pairs of toggle joint linkages include a first almost horizontally disposed toggle joint linkage that is articulated on the respective side bars and presents a bearing point on the press frame. A second almost vertically disposed toggle joint linkage that is connected with the first toggle joint linkage and is articulated so as to be guided by the press frame on the mass balancing weight.