US Patent No. 9,127,810

INJECTION MOLDING MACHINE WITH MOTOR POWER INTERRUPTION FUNCTION


Patent No. 9,127,810
Issue Date September 08, 2015
Title Injection Molding Machine With Motor Power Interruption Function
Inventorship Hideki Koyama, Yamanashi (JP)
Assignee FANUC CORPORATION, Yamanashi (JP)

Claim of US Patent No. 9,127,810

1. An injection molding machine with motor power interruption function, in which said injection molding machine has at least
two motor power interruption units which drive a moving part of the injection molding machine by means of a motor and are
configured to switch between power supply to the motor and interruption of power supply to the motor according to an open/close
state of a safety door, said injection molding machine comprising:
a first safety-door state detection unit configured to detect the open/close state of the safety door;
a first determination unit configured to determine whether or not to interrupt power supply to the motor, based on a first
safety-door state signal output from the first safety-door state detection unit, an operating state of the injection molding
machine, and a first interruption criterion setting previously set in the injection molding machine, and to output a first
motor power interrupt signal;

a first motor power interruption unit configured to interrupt power supply to the motor in response to the first motor power
interrupt signal output from the first determination unit;

a second safety-door state detection unit configured to detect the open/close state of the safety door;
a second determination unit configured to determine whether or not to interrupt power supply to the motor, based on a second
safety-door state signal output from the second safety-door state detection unit, the operating state of the injection molding
machine, and a second interruption criterion setting previously set in the injection molding machine, and to output a second
motor power interrupt signal;

a second motor power interruption unit connected in series with the first motor power interruption unit and configured to
interrupt power supply to the motor in response to the second motor power interrupt signal output from the second determination
unit; and

a third determination unit configured to determine whether or not the respective contents of the first and second interruption
criterion settings are different from each other and output a third motor power interrupt signal if the contents of the two
settings are different, wherein

one of the at least two motor power interruption units is interrupted by the third motor power interrupt signal output by
the third determination unit, thereby interrupting power supply to the motor.