A manually operated press comprising an actuating member coupled to a shaft, wherein an actuation of the actuating member is converted into a stroke movement of a press ram coupled to the shaft, and hence also into a change in a relative position of the press ram. The press furthermore comprises a reset mechanism for resetting the actuating member, which reset mechanism counteracts the actuation of the actuating member and causes a return movement of the press ram opposite the stroke movement. The reset mechanism comprises a spiral spring.

A method for operating a machine tool/work machine includes providing a machine tool/work tool including a stroke element, a connection arrangement including a traction/pressure element and at least one traction/pressure point, a detachable connection including a connection element, a compensation element or a unit which generate a pre-stress, a (cutting) impact dampening, and compensates for a weight of the stroke element in the connection arrangement. The drive device acts on a work piece to be machined via the connection arrangement with the traction/pressure element and the at least one traction/pressure point via the stroke element. A force is produced via the compensation element or a unit corresponding to a weight of the traction/pressure element, the force being initiated independently from a drive force for the stroke element, to generate a pre-stress, a (cutting) impact dampening and a compensation of the weight of the stroke element in the connection arrangement.

The invention relates to a stamping press arrangement comprising a plurality of first stamping press units arranged adjacent to one another, which have working directions extending parallel in relation to each other in a common plane, and comprising a second stamping press unit, the working direction of which extends perpendicularly in relation to the working directions of the first stamping press units, such that material processed in said stamping press unit can be guided in the direct extension of the working direction thereof into the working regions of the first stamping press units. The stamping press units each have a crankshaft portion or eccentric shaft portion, by means of which the travel movement of the press ram is effected via a connecting rod. The crankshaft portion or eccentric shaft portion of the first stamping press units are driven forcibly together via a common drive unit with the same speed and comprise a common axis of rotation. The crankshaft portion or eccentric shaft portion of the stamping press unit is coupled to the crankshaft portion or eccentric shaft portion of the first stamping press units so as to forcibly rotate therewith in a synchronous manner. The invention allows high-precision and high-speed stamping press arrangements to be provided for economically mass-producing multi-part stamping and shaped and punched products which have low tolerances, such as container ends with press-in or pull tabs for opening without tools, in a cost-effective manner.

A press machine includes a press frame, a crankshaft having a first eccentric portion, at least one crankshaft motor connected to the crankshaft, a ram, an upper tool section supported by the ram and a lower tool section fixedly attached to the press frame, a linkage type ram drive mechanism connected to the crankshaft and including at least one pivot support pin, and a ram adjustment mechanism including a pivot support member supporting the at least one pivot support pin. Wherein the at least one secondary ram drive link is pivotally connected at a first end to the at least one pivot support pin and at a second end to a first end of the at least one main ram drive link. The at least one main ram drive link is pivotally connected at a second end to the ram. The at least one ram drive connecting link is rotatably supported by the at least one first eccentric portion of the crankshaft at a first end and pivotally connected at a second end to the at least one main ram drive link at a point between the first and second ends of the at least one main ram drive link.

A press machine includes a press frame having first and second portions, a crankshaft, a crankshaft, a ram, a ram drive mechanism supported by the first portion of the press frame at a primary force application location, a ram guide linearly guiding the ram, and supported by the second portion of the press frame at a ram guide location; and a working tool including an upper tool section and a lower tool section configured for the processing of a workpiece. The upper tool section is fixedly attached to the ram and the lower tool section is fixedly attached to the press frame at a lower tool location. The primary force application location has a first working position during the processing of the workpiece, and a second resting position when the workpiece is not being processed. The ram guide location has a first working position during the processing of the workpiece, and a second resting position when the workpiece is not being processed. The difference between the working position and the resting position of the ram guide location is less than the difference between the working position and the resting position of the primary force application location.

A drive device (10) for a forming machine (11) includes a hypocycloid gear assembly (20) having an eccentric gear (23), a stationary annulus gear (24) and a planetary gear system (28). The planetary gear system (28) includes an orbiting gear (29) orbiting and rolling in an annulus gear (24). The orbiting gear (29) is connected to at least one first planetary gear (35). On the first planetary gear (35), a first planetary gear equalization mass (m.sub.2) is disposed diametrically opposite an output bearing. At least one first eccentric gear equalization mass (m.sub.3) is arranged on the eccentric gear (23). The first eccentric gear equalization mass (m.sub.3) is arranged diametrically opposite, relative to a planetary gear axis (PA) about which the planetary gear system (28) rotates. The resultant forces and torques acting on the annulus gear (24) can at least be reduced by the equalization masses.

The invention relates to a punch press with a crank or eccentric drive, including a crank or eccentric shaft (1a, 1b) and active connecting rods (9a, 9b) for generating the stroke movement of the press ram (13). Furthermore, the punch press includes balancing weights (2a, 2b) for balancing the vertical and horizontal mass forces and is designed in such a way that the horizontal drive movements required for the horizontal mass balancing are tapped directly at the crank or eccentric shaft (1a, 1b), preferably laterally at the crank or eccentric shaft (1a, 1b).