Patent ID: 7302787

Claim:
A defect detection device adapted to receive bags manufactured by a bag packaging machine and convey the bags to a downstream side through a conveyance path while checking for defects of the bags, the defect detection device comprising: a first transfer unit that is arranged below the bag packaging machine and adapted to receive the bags that are discharged from the bag packaging machine and convey the bags to a downstream side; a second transfer unit that is arranged on the downstream side of the first transfer unit; a detector that is arranged adjacent to a downstream end of the first transfer unit and configured to send a detection signal when the detector detects an object that is conveyed by the first transfer unit; and a controller that is operatively connected to the first transfer unit, the detector, and the second transfer unit, and stores therein a size of a proper bag that is being manufactured, the controller being configured to find a defective bag based on the size of the proper bag, a conveying speed of the first transfer unit, duration of the detection signal from the detector, and a conveying speed of the second transfer unit, the first transfer unit being pivotably supported by the second transfer unit.