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Patent
KOMATSU INDUSTRIES Corporation | Date: 2012-06-26

A press machine includes a controller including a top-dead-center detector adapted to: rotate a main shaft in a predetermined direction selected from a normal rotation direction and a reverse rotation direction to place a slide at a first position displaced relative to a top dead center of the slide by a predetermined height; while outputting and counting pulses from an angle detector, rotate the main shaft in a direction opposite to the predetermined direction to move the slide to a second position located at the same height as the first position beyond the top dead center; and rotate the main shaft from the second position in the predetermined direction by an amount corresponding to a half of the counted pulses to detect the top dead center.


Patent
Komatsu Industries Corporation | Date: 2013-02-18

A press machine braking performance verifying apparatus verifies performance of brakes applying braking to a slide. The press machine braking performance verifying apparatus includes a speed detecting component, a stopping instruction detecting component, a stopping time measuring component, a maximum stopping time calculating component and an evaluating component. The speed detecting component detects a slide driving speed. The stopping instruction detecting component detects if stopping of the slide is instructed. The stopping time measuring component measures a stopping time until the slide stops when a stopping instruction is detected. The maximum stopping time calculating component calculates predicted stopping time in a case where the slide is driven at a maximum driving speed based on the slide driving speed after detecting the stopping instruction and the stopping time. The evaluating component evaluates performance of the brakes by comparing the predicted stopping time and a threshold valve set in advance.


Patent
Komatsu Industries Corporation | Date: 2013-12-25

A plasma torch is provided with an electrode for generating a plasma arc, a nozzle having an opening through which the plasma arc passes, and a cover member. The cover member is arranged to cover the nozzle in the jetting direction of the plasma arc from the nozzle. The cover member has an opening through which the plasma arc passes. The cover member is made from a magnetic material.


Patent
Komatsu Industries Corporation | Date: 2014-02-04

A press machine includes a servo amplifier configured to supply a drive current to a servo motor, current detecting means for detecting the drive current, rotational angle detecting means for detecting a rotational angle of a rotary motion, speed setting means, determination means and speed changing means. The speed setting means is configured to set a press production speed by setting a correspondence between rotational angles and rotational speeds at the rotational angles, which defines the rotary motion. The determination means is configured to determine whether or not the drive current detected by the current detecting means is greater than or equal to a first threshold. The speed changing means is configured to reduce all the rotational speeds set by the speed setting means by an equal ratio when the drive current detected by the current detecting means is greater than or equal to the first threshold.


Patent
Komatsu Industries Corporation | Date: 2013-10-22

There is provided an assist gas generation apparatus for a laser processing machine that is capable of dross-free cutting by using a nitrogen-rich gas and of reducing the cutting cost. An assist gas supply portion in a laser processing machine includes an air compressor for taking in air and compressing the air to a prescribed pressure, an oxygen separation device having an oxygen separation membrane for separating an oxygen gas from the air compressed by the air compressor and generating a nitrogen-rich gas, and a booster for compressing the nitrogen-rich gas generated by the oxygen separation device. A throttle portion is provided between the air compressor and the oxygen separation device or between the oxygen separation device and the booster.

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