Abstract: A method for determining the thickness of a material strip (5) when feeding the material strip (5) to the processing zone of a machine tool (1). The material strip (5) is clamped between two rotatable rollers (3, 4), whose relative position to each other in the original state with clean rollers and “zero” roller spacing was detected (reference relative position) and whose relative position to each other in the intended feed operation is determined for each feed interval (current relative position). The difference between the current relative position and the reference relative position, which gives the thickness of the strip material (5) when the rollers are clean in their original state, is corrected according to the invention for any changes in diameter of the rollers (3, 4) that may have occurred, for example, due to contamination.

Abstract: A method for operating a servo motor (10) driven turning station (5, 6, 7) of a stacking tool for a punch press includes the following steps: determining a target turning acceleration curve of the turning station (5, 6, 7) in the acceleration phase (A) of the turning increment (D); carrying out a reference acceleration run of the turning station (5, 6, 7); determining during the reference acceleration run the reference angular velocity (?ref) of the turning station (5, 6, 7); determining from the target turning acceleration curve the target angular velocity (?soll); calculating a target drive torque of the servo motor, at which the target angular velocity (?soll) results, from the relationship, known from the reference acceleration run; and accelerating the turning station (5, 6, 7) with the servo motor (10) in the acceleration phase (A).

Abstract: 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).

Abstract: The invention relates to a spring-damper element (2) for mounting a punching press (1), with a hydraulic damper unit (3) with a first fluid chamber (4) and a second fluid chamber (5), wherein, in the intended operation, a hydraulic fluid is displaced from the first fluid chamber (4) via a throttle point (6) into the second fluid chamber (5) when the spring-damper element (2) is compressed. The damper unit further comprises an overload valve (7) arranged between the first fluid chamber (4) and the second fluid chamber (5), which overload valve opens when a specific fluid pressure is reached in the first fluid chamber (4) or when a specific pressure difference is reached between the first fluid chamber (4) and the second fluid chamber (5) and releases a bypass (8) via which hydraulic fluid then flows from the first fluid chamber (4) into the second fluid chamber (5) bypassing the throttle point (6).

Abstract: 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.

Abstract: A method for warping the machine bed of a punching press, which machine bed has an aperture for carrying away punching parts and rubbish, compensates at least partially for a bending of the machine bed caused by the punching force during the punching operation. Thereby, forces acting transverse to the punching direction are introduced into the machine bed and/or forces acting transverse to the punching force direction are produced inside the machine bed, by means of which the machine bed warps in the direction towards the press ram and indeed such that it warps stronger in the area adjacent to the aperture than in the areas adjacent to its longitudinal sides. By the method, apertured machine beds of punching presses can, with very little expenses on the equipment side, be spatially pre-deformed in order to compensate at least partially bendings caused by punching forces.

Abstract: The invention relates to a punching press with a clamping plate (27) and with a press ram (1) which lies opposite the upper side of the clamping plate (27) and operates towards the clamping plate (27) and is moveable up and down via four tension columns (2) by means of a crank drive arranged below the belt movement plane (X) of the punching press. The press ram (1) is guided exclusively via the tension columns (2) which, in turn, are guided in inclination-tolerant guides (3) in the belt movement plane (X) in such a manner that the press ram (1) and the tension columns (2) can be positioned obliquely as a consequence of differing longitudinal expansion of the tension columns (2) under an eccentric load by the tension columns (2) being inclined about axes of inclination running in the region of the belt movement plane (X) of the punching press.

Abstract: 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 (4, 4a, 4b), a sun gear (2a, 21, 21a) and a plurality of planet gears (3, 3a, 3b) supported on a planet carrier (5, 5a, 6), wherein the sun (2a, 21, 21a) of each following planetary gear train stage is formed by the planet gear carrier (5, 5a) of the preceding planetary gear train stage. The gear train unit comprises a drive element (2), which forms the sun gear (2a) of the first planetary gear train stage, and an output element (17), which is connected in a torsionally rigid manner to the planet gear carrier (6) of the last planetary gear train stage. The gear train unit can be shifted in such a way that either a first or a second gear ratio can be set.

Abstract: 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 (4, 4a, 4b), a sun gear (2a, 21, 21a) and a plurality of planet gears (3, 3a, 3b) supported on a planet carrier (5, 5a, 6), wherein the sun (2a, 21, 21a) of each following planetary gear train stage is formed by the planet gear carrier (5, 5a) of the preceding planetary gear train stage. The gear train unit comprises a drive element (2), which forms the sun gear (2a) of the first planetary gear train stage, and an output element (17), which is connected in a torsionally rigid manner to the planet gear carrier (6) of the last planetary gear train stage. The gear train unit can be shifted in such a way that either a first or a second gear ratio can be set.

Abstract: The invention relates to an advancing apparatus for the intermittent supply of a semi-finished material (22) in the form of a band to a press. The apparatus comprises a pair of displacement grippers (4, 7) which run forwards and backwards and by which the material (22) is advanced in an advancing phase, a stationary pair of clamping grippers (24, 27) by which the material (22) is held in a fixed manner in a non-advancing phase, and a control rocker (12) with a control drive (40, 42) which is coupled to one control end of the latter and to which the pair of displacement grippers (4, 7) and the pair of clamping grippers (24, 27) are coupled mechanically and their interaction is controlled.

Abstract: The invention concerns a multistage press, at which within the machine-mounted clamping plate (1), an insert (3) is arranged which can alternatingly be moved in the direction towards the press plunger (2) and away from it. The insert (3) is moved up and down by a cam drive actuated by the press main drive with lifting and lowering cams (5), whose cam tracks (8a, 8b) are traced by lifting rollers (6) and lowering rollers (7) under compressive prestress. Such a multistage press can be operated with a high number of strokes per minute and has, at the same time, an excellent precision of the stroke movement.

Abstract: A feed apparatus for intermittently feeding band-shaped material to a press has two feed rollers for advancing the material. An upper feed roller is bearing-mounted in a rocker for swivel-movement with a pivot bearing on a unidirectionally hydraulic cylinder into a high-lifted position enabling introduction of the material between the rollers. For lowering of the upper roller, the cylinder is rendered pressureless and a press spring pressed onto the material between the rollers. In this position, the pivot bearing can be fixed for automatically adjusting the feed apparatus to the thickness of the material.

Abstract: A adjusting nut is arranged on a threaded spindle. The adjusting nut supports a first double arm lever unit with a first and a second arm. A second double arm lever unit is pivotally mounted at its first arm through a connecting strip to the second arm of the first double arm unit. The second arm of the second double arm unit is pivotally mounted through a control rod unit to a rocker. This rocker supports a upper feeding roller which co-operates with a lower feeding roller for a feeding of a strip shaped blank. The first arm of the first double arm unit supports a bolt which projects into a elongate hole of a eccentrically supported rod.

Abstract: The elongate rocker is forked at its first end and includes two fork tines. These are designed symmetrically relative to the longitudinal plane of symmetry of the rocker. A control rod with a longitudinal center axis is pivotally mounted at its bottom end to the second end of the rocker. A spiral pressing spring with a longitudinal center axis acts onto the rocker. The upper feeding roller is designed symmetrically to a plane extending perpendicularly relative to its longitudinal center axis. The longitudinal center axis of the control rod defines together with the longitudinal center axis of the pressing spring a geometrical plane. This plane coincides with the longitudinal plane of symmetry of the rocker, which in turn coincides with the geometrical plane which extends perpendicularly to the longitudinal center axis.

Abstract: An adjusting nut is arranged on a threaded spindle and supports a first double arm lever unit with a first and a second arm. A second double arm lever unit is pivotally mounted at its first arm through a connecting strip to the second arm of the first double arm unit. The second arm of the second double arm unit is pivotally mounted through a control rod unit to a rocker. This rocker supports upper feeding roller which co-operates with a lower feeding roller for a feeding of a strip shaped blank. The first arm of the first double arm unit supports a bolt which projects into an elongate hole of an eccentrically supported rod.

Abstract: The elongate rocker is forked at its first end and includes two fork tines. These are designed symmetrically relative to the longitudinal plane of symmetry of the rocker. A control rod with a longitudinal center axis is pivotally mounted at its bottom end to the second end of the rocker. A spiral pressing spring with a longitudinal center axis acts onto the rocker. The upper feeding roller is designed symmetrically to a plane extending perpendicularly relative to its longitudinal center axis. The longitudinal center axis of the control rod defines together with the longitudinal center axis of the pressing spring a geometrical plane. This plane coincides with the longitudinal plane of symmetry of the rocker, which in turn coincides with the geometrical plane which extends perpendicularly to the longitudinal center axis.

Abstract: A adjusting nut is arranged on a threaded spindle. The adjusting nut supports a first double arm lever unit with a first and a second arm. A second double arm lever unit is pivotally mounted at its first arm through a connecting strip to the second arm of the first double arm unit. The second arm of the second double arm unit is pivotally mounted through a control rod unit to a rocker. This rocker supports a upper feeding roller which co-operates with a lower feeding roller for a feeding of a strip shaped blank. The first arm of the first double arm unit supports a bolt which projects into a elongate hole of a eccentrically supported rod.

Abstract: Two intermittently and oscillating driven feeding rollers (2; 3) are adapted to feed a strip-shaped workpiece (63). The bottom feeding roller (2) is supported in the frame (1) of the feeding device. The upper feeding roller (3) is supported in a rocker (30). The movement of the rocker (30) is controlled by a control disk (64) through a lever and a rod arrangement (40). The rocker (30) rests at one end (33) via a pressure spring (39) against the frame (1). At the opposite end (34) the rocker (30) rest against the frame (1) via a further pressure spring (36). The rocker (30) is supported in an overhung state on a cantilever which consists of a sleeve (70), a arm (71) projecting laterally from the sleeve (70) and a shaft (72) held clamped in the arm (71). The clamping bar (46) is firmly mounted to the shaft (72).

Abstract: The feeding apparatus is driven intermittently by a electric servomotor with a drive shaft. The upper feeding roller is held clamped in a bipartite upper shaft assembly between a shaft portion located adjacent the electric servomotor and a shaft portion located remote from the electric servomotor. The lower feeding roller is held clamped in a bipartite lower shaft assembly between a shaft portion located adjacent the electric servomotor and a shaft portion remote from the electric servomotor. The upper shaft assembly is supported in a rocker. The transmission of the driving force from the electric servomotor to the upper shaft assembly proceeds via a Oldham-type coupling. The transmission of the driving force from the upper shaft assembly to the lower shaft assembly proceeds via spur gear wheels. The connection between the drive shaft of the electric servomotor and the upper shaft assembly is accomplished by a multi-part clamping sleeve device.

Abstract: Two intermittently and oscillating driven feeding rollers (2; 3) are adapted to feed a strip-shaped workpiece (63). The bottom feeding roller (2) is supported in the frame (1) of the feeding device. The upper feeding roller (3) is supported in a rocker (30). The movement of the rocker (30) is controlled by a control disk (64) through a lever and a rod arrangement (40). The rocker (30) rests at one end (33) via a pressure spring (39) against the frame (1). At the opposite end (34) the rocker (30) rest against the frame (1) via a further pressure spring (36). The rocker (30) is supported in an overhung state on a cantilever which consists of a sleeve (70), a arm (71) projecting laterally from the sleeve (70) and a shaft (72) held clamped in the arm (71). The clamping bar (46) is firmly mounted to the shaft (72).