Abstract: There is provided a roller conveyor that has a function capable of specifying a failure part or a defective part. When a signal for executing a failure detection operation is transmitted from a host controller (50) to each zone controller (10), each zone controller (10) immediately activates the corresponding motor-incorporating roller (5a). Then, after a certain time, the motor-incorporating roller (5a) is stopped. A pulse interval thereafter is detected by a pulse interval monitoring program (36) to determine whether a delay phenomenon has occurred. The delay phenomenon is a phenomenon in which the pulse signal generation interval is temporarily extended.

Abstract: In a transfer apparatus, a lifting unit has a lifting mechanism having a plurality of combined members and a motor. The lifting mechanism converts the rotation force of the motor to movement in the lifting direction, transmits the movement to at least one of first and second conveyors, raises or lowers at least one of first and second conveyors, and stops rotation of the motor when one of conveying paths reaches a predetermined height. In that process, a physical limit identification operation is executed in which the motor is rotated to operate the lifting mechanism to a physical operation limit and is then stopped, and control of the motor is changed so that the motor is rotated at low speed until the lifting mechanism reaches the physical operation limit.

Abstract: There is provided a roller conveyor that has a function capable of specifying a failure part or a defective part. When a signal for executing a failure detection operation is transmitted from a host controller (50) to each zone controller (10), each zone controller (10) immediately activates the corresponding motor-incorporating roller (5a). Then, after a certain time, the motor-incorporating roller (5a) is stopped. A pulse interval thereafter is detected by a pulse interval monitoring program (36) to determine whether a delay phenomenon has occurred. The delay phenomenon is a phenomenon in which the pulse signal generation interval is temporarily extended.

Abstract: In a transfer apparatus, a lifting unit has a lifting mechanism having a plurality of combined members and a motor. The lifting mechanism converts the rotation force of the motor to movement in the lifting direction, transmits the movement to at least one of first and second conveyors, raises or lowers at least one of first and second conveyors, and stops rotation of the motor when one of conveying paths reaches a predetermined height. In that process, a physical limit identification operation is executed in which the motor is rotated to operate the lifting mechanism to a physical operation limit and is then stopped, and control of the motor is changed so that the motor is rotated at low speed until the lifting mechanism reaches the physical operation limit.