A crank press with an adjustable stroke comprises a press frame having a frame slideways therewithin with a slider reciprocatively movable therealong and supported by a pneumatic cylinder. In order to significantly increase a working force, a length of the working stroke and efficiency, the crank press further comprises: at least two mutually synchronized crank drives configured for reciprocatively moving the slider along the frame slideways, a lever-crosspiece mechanism having at least one pair of threaded guide stanchions secured within the frame bed, a crosspiece slidably mounted on the guide stanchions atop the slider, at least two two-arm levers hingedly connected to the slider supportadly on the crosspiece, at least one pair of crosspiece stop nuts engaged with threads of the guide stanchions and configured for arresting the cross-piece at the moment of applying a force to the slider by the lever and a switching arrangement for slider reversal with regulation of its stroke.

Provided is a drive device for an electric servo press machine, the drive device including: left and right drive shafts rotationally driven by left and right electric servo motors; main pinion gears provided to the left and right drive shafts; main gears meshed with the main pinion gears; connecting rods connected to the main gears; and a slide supported thereby. Further, idle gears can be provided between the main gears.

There is provided a press machine capable of simplifying a slide drive mechanism. The press machine comprises: a slide supported so as to be reciprocally movable; a crankshaft arranged along a longitudinal direction of the slide and having a plurality of eccentric parts; a drive unit configured to rotate the crankshaft; a plurality of yokes and each provided to each of the eccentric parts of the crankshaft and configured to reciprocate, due to rotation of the crankshaft, along a moving direction of the slide; and a plurality of points each connects each of the yokes to the slide, wherein at least one of the plurality of yokes is connected to the slide via some of the plurality of points arranged along a direction perpendicular to an axial direction of the crankshaft.

A servo press machine includes a display unit that displays a strip-shaped region for setting a motion of a slide and an operation unit that receives an input operation. A range extending from an upper end of the strip-shaped region to a lower end thereof corresponds to a movement range of the slide in a linear movement, and the strip-shaped region is formed of a plurality of slide operation regions that are consecutive in a direction in which the strip-shaped region extends. Each of the slide operation regions can set a speed of the slide in response to the input operation received by the operation unit, and a boundary between adjacent two of slide operation regions can move along the direction in which the strip-shaped region extends in response to the input operation received by the operation unit.

A path-controlled press, with at least one drive shaft having a driver that is eccentric relative to a shaft axis, and a sliding block, wherein the sliding block is driven by the driver to perform a forcibly actuated movement During the execution of a pressure stroke, the sliding block is guided on at least one sliding surface on the pressure side in relation to a pressure-side surface of a slide guide. The sliding block has a sliding surface on the pulling side opposite the sliding surface on the pressure side, which is guided on a surface of the slide guide on the pulling side. The sliding surface on the pressure side of the sliding block has a concave or convex curvature. The sliding surface on the pulling side of the sliding block has another respective concave or convex curvature.

A reciprocating press for acting on a workpiece is described, and includes an eccentric shaft rotatably disposed in a rotatable eccentric sleeve, and a crank-slider mechanism coupled to the eccentric shaft. Rotations of the eccentric shaft and the rotatable eccentric sleeve are independently controllable to dynamically vary a stroke length of the crank-slider mechanism.

A servo press machine includes an eccentric shaft, a connecting rod, a slide, an eccentric shaft-side sliding surface, a connecting rod-side sliding surface, an oil supply port, and a supply mechanism. The oil supply port opens on the eccentric shaft-side sliding surface or the connecting rod-side sliding surface, and supplies a lubricant between the eccentric shaft-side sliding surface and the connecting rod-side sliding surface. The supply mechanism supplies the lubricant to the oil supply port. The eccentric shaft-side sliding surface is formed on the eccentric shaft that is rotationally driven by a servomotor. The oil supply port is formed on the connecting rod-side sliding surface of the connecting rod that moves upward and downward due to the rotational driving of the eccentric shaft.

A press device is configured to subject a material to pressing by using an upper die and a lower die. The press device includes a slide, a bolster, a servomotor, an electric double layer capacitor, and a capacitor cooling unit. The upper die is attached to a lower face of the slide. The bolster is disposed under the slide. The lower die is disposed on the bolster. The servomotor drives the slide. The electric double layer capacitor is capable of supplying stored electric power to the servomotor. The capacitor cooling unit cools the electric double layer capacitors.

The invention relates to a gear train unit, comprising a plurality of planetary gear train stages, which are connected one after the other and which each comprise a ring gear, a sun gear, and a plurality of planet gears supported on a planet carrier, wherein the sun gear of each following planetary gear train stage is formed by the planet carrier of the preceding planetary gear train stage. The gear train unit comprises a driving element, which forms the sun gear of the first planetary gear train stage, and an output element, which forms the planet carrier of the last of the gear planetary gear train stages connected one after the other. The driving element is supported by means of first bearings arranged in the region of ends of the driving element, in such a way that the driving element can rotate about a longitudinal axis of the driving element, and at least some of the planet carriers of the planetary gear train stages are supported on the driving element in the region between the first bearings by means of bearings. The invention makes it possible to provide a gear train unit having a plurality of planetary gear train stages connected one after the other that is economical, extremely robust, and very compact and that additionally can transmit very high power.

A press system includes a detection unit configured to detect occurrence of an abnormality during press working for a workpiece, and an abnormality determination unit configured to determine an abnormality level, based on the abnormality detected by the detection unit and a stoppage period for which a pressing operation is stopped after occurrence of the abnormality.