Abstract: A power supply unit for a press machine having a converter (converter circuit) connected to a commercial AC power supply, and an inverter (inverter circuit) connected to a press motor, includes an electrical energy bank, an inrush prevention circuit, an inrush prevention instruction signal generation section, and a contactor switch section, wherein contactors of the inrush prevention circuit are switched from on ON state to an OFF state and inrush prevention resistors of the inrush prevention circuit are connected to AC phase current paths on condition that the inrush prevention instruction signal generation section has generated and output an inrush prevention instruction signal (Sres) during press operation.

Abstract: A conveying device includes annular continuous bodies each extending in a conveying direction of an object to be conveyed and each being rotationally driven, and a plate-like member extending in a conveying lateral direction and mounted on each of the annular continuous bodies. The conveying device conveys the object by placing the object on a conveying surface formed by the plate-like member, in which the plate-like member mounted on one of the annular continuous bodies. The plate-like member mounted on another of the annular continuous bodies, which is adjacent to the one of the annular continuous bodies, are arranged in a staggered manner without overlapping with each other when viewed from a direction orthogonal to the conveying surface. Adjacent two of the annular continuous bodies have an interval therebetween in the conveying lateral direction. The interval is expandable and contractable.

Abstract: An electric servo press machine is configured to convert a rotation of an electric servomotor into a reciprocating linear motion of a slide to perform press working on a workpiece. The machine includes a clutch mechanism interposed in a power transmission path between the servomotor and the slide, and a brake mechanism for applying a brake onto the slide under a disconnected state in which the servomotor and the power transmission path are decoupled from each other by the clutch mechanism. The machine brings the clutch mechanism into the disconnected state and applies the brake onto the slide upon an immediate stop request, and recovers from immediate stop under a state in which a phase shift between the servomotor and the power transmission path ranging from the clutch mechanism in the disconnected state to the slide is eliminated under a connected state of the clutch mechanism.

Abstract: A servo transfer press system generates a press phase signal and a transfer phase signal that are synchronized with a master phase signal, performs a press operation according to a reference press motion based on the press phase signal, and performs a transfer operation according to a reference transfer motion based on the transfer phase signal. The servo transfer press system includes a reference interference diagram generation section, a reference interference diagram storage section, an operation interference diagram generation section, an interference presence/absence comparison-determination section, and a phase signal relative relationship adjustment section, and performs a transfer press operation while avoiding interference by performing an automatic phase signal adjustment when a motion has been changed.