Abstract: A rotating speed of a main motor (61) of a second press (3) is regulated so that an angular difference between a press angle of a first press (2) and a press angle of a second press (3) is constant. Further, when the work is carried-out from the first press (2), a work transportation device (10) is controlled based on a press angle of the first press (2). When the work is carried-in into the second press (3), the work transportation device (10) is controlled based on a press angle of the second press (3). Further, when the work is transported, the work transportation device 10 is controlled based on a signal from a transportation device control section (31) for controlling the work transportation device (10). The arrangement above improves production efficiency in press forming and reduces maintenance cost and frequency.

Abstract: A die cushion controlling apparatus for controlling an operation of a cushion pad, which comprises a pad drive mechanism for driving to raise or lower the cushion pad while applying an upward energizing force, a load measuring unit for measuring a load generated in the cushion pad, a time detecting unit for detecting a generating time and a vanishing time of the load, and a control unit for controlling the pad drive mechanism so that a load measured value measured by the load measuring unit follows a preset load pattern during a period from when the time detecting unit detects the generating time of the load until when the time detecting unit detects the vanishing time of the load.

Abstract: A die cushion device is comprised of die cushion modules which are independently movable and unitized. The individual die cushion modules are provided with a cushion pad, a servomotor, a power transmission mechanism, a power conversion mechanism and a guide member. By configuring in this way, the design of the die cushion is facilitated, a drive mechanism of the die cushion becomes compact, and the number of types of parts used is decreased.

Abstract: Rotating speed of a main motor (61) of a second press (3) is regulated so that an angular difference between a press angle of a first press (2) and a press angle of a second press (3) is constant. Further, when the work is carried-out from the first press (2), a work transportation device (10) is controlled based on a press angle of the first press (2). When the work is carried-in into the second press (3), the work transportation device (10) is controlled based on a press angle of the second press (3). Further, when the work is transported, the work transportation device 10 is controlled based on a signal from a transportation device control section (31) for controlling the work transportation device (10). The arrangement above improves production efficiency in press forming and reduces maintenance cost and frequency.

Abstract: A die cushion device is comprised of die cushion modules which are independently movable and unitized. The individual die cushion modules are provided with a cushion pad, a servomotor, a power transmission mechanism, a power conversion mechanism and a guide member. By configuring in this way, the design of the die cushion is facilitated, a drive mechanism of the die cushion becomes compact, and the number of types of parts used is decreased.

Abstract: A die cushion controlling apparatus for controlling an operation of a cushion pad, which comprises a pad drive mechanism for driving to raise or lower the cushion pad while applying an upward energizing force, a load measuring unit for measuring a load generated in the cushion pad, a time detecting unit for detecting a generating time and a vanishing time of the load, and a control unit for controlling the pad drive mechanism so that a load measured value measured by the load measuring unit follows a preset load pattern during a period from when the time detecting unit detects the generating time of the load until when the time detecting unit detects the vanishing time of the load.

Abstract: A preventive maintenance system for an industrial machine includes an information transmission unit for connecting, whenever necessary, a LAN on the user side and a LAN on a manufacturer side through a communication line; a monitor unit connected to the LAN on the user side for monitoring predetermined items of the industrial machine; an information transmission/reception unit for transmitting the monitor information obtained by the monitor unit to the LAN on the manufacturer side through the information transmission unit, and for receiving information from the LAN on the manufacturer side; a supervisory unit connected to the LAN on the manufacturer side for automatically diagnosing a fault based on the monitor information received, and for automatically supervising the industrial machine; and a preventive maintenance information transmission unit for automatically transmitting preventive maintenance information to the user side when maintenance is necessary based on a diagnosis result.

Abstract: The condition of each of machines on dispersed lines can be quantitatively grasped before an error occurs, without going to the machine installation site, so that the efficiency of machine fault diagnosis can be improved. One server terminal for diagnosis is provided for each factory at the use side. As clients for this server terminal, a press controller, a workpiece conveyor control motion controller, and a line production management computer are connected through an Ethernet. The server terminal is connected via modem and telephone line to a diagnosis terminal with a modem which is installed at the maker side. The operating condition of a press is measured and recorded as continuous time-series waveform data, using an analog input card. The recorded waveform data is processed to be graphically displayed on the diagnosis terminal, etc.

Abstract: A preventive maintenance system for an industrial machine includes an information transmission unit for connecting, whenever necessary, a LAN on the user side and a LAN on a manufacturer side through a communication line; a monitor unit connected to the LAN on the user side for monitoring predetermined items of the industrial machine; an information transmission/reception unit for transmitting the monitor information obtained by the monitor unit to the LAN on the manufacturer side through the information transmission unit, and for receiving information from the LAN on the manufacturer side; a supervisory unit connected to the LAN on the manufacturer side for automatically diagnosing a fault based on the monitor information received, and for automatically supervising the industrial machine; and a preventive maintenance information transmission unit for automatically transmitting preventive maintenance information to the user side when maintenance is necessary based on a diagnosis result.

Abstract: A controller for a work transfer system, capable of performing precise positioning of feed bars during sole driving of the transfer system and simplified in structure to contribute to savings in installation space and cost. The controller has a cam angle detector mounted on a cam shaft for feed cams and controls servo motors for respective lift bars according to information which is related to cam angle of the feed cams detected by the cam angle detector and looked up in a motion table set by a transfer controlling PLC serving as a motion table setting means.

Abstract: If a fault occurs in a servo driving system incorporated in a transfer system, the transfer system is continuously driven or safely stopped without loosing synchronization of the transfer system with a pass system. The transfer system is driven by a plurality of independently controllable servo motors 12.sub.1 to 12.sub.n. In the event that a driver for any one of the servo motors is failed for example, transmission of driving force to the servo motor associated the failed driver is interrupted by a magnet conductor in response to a specified signal indicative of a driver failure so that the servo motor can be brought into a free state.

Abstract: There is provided a refuging system for transfer bars of a transfer feeder of a transfer press, in which the transfer bars are driven by a transfer bar driving mechanism including an induction type servo motor. The refuging system includes a servo control for controlling the induction type servo motor, a detector for detecting an occurrence of an abnormal condition of the servo control and urgently stopping operations of a slide of a press body of the transfer press and the induction type servo motor, a detector for detecting a crank angle of the press body and discriminating an area in which the slide or a mold of the press body interfere with the transfer bar of the transfer feeder or an attachment therefor attached to the transfer bar, and a driver for driving the transfer bar to a position at which the slide and the mold of the press body do not interfere with the transfer bar of the transfer feeder and the attachment by applying an A.C.

Abstract: Synchronous driving of a press system and a transfer system at the time of failure is achieved by employing an extremely inexpensive arrangement. A capacitor is provided in an electric supply line for servo motors incorporated in the transfer system, for supplying energy to the servo motors in the event of power failure. There are provided a power failure sensor for sensing power failure and an uninterruptible power supply unit for supplying energy to a control system (a transfer system controller, relay logic and others) for controlling the servo motors, when the power failure sensor senses power failure.