To provide a servo controller for an industrial machine allowing construction of a system achieving more excellent power efficiency than a conventional system. A servo controller includes: a driving motor that drives an industrial machine; a load detecting unit that detects a load on the driving motor or the amount of power consumed by the driving motor; a buffer motor that feeds regenerative power to the driving motor on the basis of a result of the detection by the load detecting unit; and a base speed setting unit for recovering the buffer motor to a second base speed set to be lower than a constant first base speed preset for the buffer motor and applied before the regenerative power is fed to the driving motor after the buffer motor is decelerated from the first base speed and the regenerative power is fed to the driving motor.

System for measuring misalignment of a tool (2) in a press device (1), the tool (2) comprises at least a first part (3) and a second part (4), which are movable relative to another in a guided manner by means of guide means comprising at least a guide pillar (10) provided in the first part (3) which is led in a guide bush (12) provided in the second part (4), wherein the system comprises measuring means (20) provided to detect misalignment of the tool (2). According to the invention, the measuring means (20) are mounted directly at the guide means.

A method for operating a servo motor (10) driven turning station (5, 6, 7) of a stacking tool for a punch press including 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) while providing a certain reference drive torque by the servo motor (10) or while supplying the servo motor (10) with a certain reference supply current; determining during the reference acceleration run the reference angular velocity (ω.sub.ref) of the turning station (5, 6, 7) when a certain turning angle is reached; determining from the target turning acceleration curve the target angular velocity (ω.sub.soll), which should be present when a certain turning angle shall be present; calculating a target drive torque of the servo motor, at which the target angular velocity (ω.sub.soll) results, from the relationship, known from the reference acceleration run, between the reference angular velocity (ω.sub.ref) and the drive torque of the servo motor (10); and accelerating the turning station (5, 6, 7) with the servo motor (10) in the acceleration phase (A) of the turning increment (D) while providing the target drive torque by the servo motor (10).

System for measuring misalignment of a tool (2) in a press device (1), the tool (2) comprises at least a first part (3) and a second part (4), which are movable relative to another in a guided manner by means of guide means comprising at least a guide pillar (10) provided in the first part (3) which is led in a guide bush (12) provided in the second part (4), wherein the system comprises measuring means (20) provided to detect misalignment of the tool (2). According to the invention, the measuring means (20) are mounted directly at the guide means.

To provide a servo controller for an industrial machine allowing construction of a system achieving more excellent power efficiency than a conventional system. A servo controller includes: a driving motor that drives an industrial machine; a load detecting unit that detects a load on the driving motor or the amount of power consumed by the driving motor; a buffer motor that feeds regenerative power to the driving motor on the basis of a result of the detection by the load detecting unit; and a base speed setting unit for recovering the buffer motor to a second base speed set to be lower than a constant first base speed preset for the buffer motor and applied before the regenerative power is fed to the driving motor after the buffer motor is decelerated from the first base speed and the regenerative power is fed to the driving motor.

A numerical controller of the present invention includes a parameter setting unit which accepts settings of punch press parameters, an NC parameter calculating unit which calculates an axis control parameter in punch pressing based on the punch press parameters, a parameter storage unit which stores the punch press parameters and the axis control parameter, a command analyzing unit which analyzes a command block in the program to generate movement command data, an interpolating unit which generates interpolation data based on the movement command data, and an accelerating and decelerating unit which calculates a linear acceleration and deceleration time constant and a bell-shaped acceleration and deceleration time constant for use in axis control based on the punch press parameters, the axis control parameter, and a feed rate specified by the command block and performs post-interpolation acceleration or deceleration processing based on each of the calculated acceleration and deceleration time constants.

A numerical controller of the present invention includes a parameter setting unit which accepts settings of punch press parameters, an NC parameter calculating unit which calculates an axis control parameter in punch pressing based on the punch press parameters, a parameter storage unit which stores the punch press parameters and the axis control parameter, a command analyzing unit which analyzes a command block in the program to generate movement command data, an interpolating unit which generates interpolation data based on the movement command data, and an accelerating and decelerating unit which calculates a linear acceleration and deceleration time constant and a bell-shaped acceleration and deceleration time constant for use in axis control based on the punch press parameters, the axis control parameter, and a feed rate specified by the command block and performs post-interpolation acceleration or deceleration processing based on each of the calculated acceleration and deceleration time constants.

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).