PURPOSE:To match the number of good products with the number of data of execution by a method in which plural molding conditions such as primary injection pressure and time, weighting time, etc., influencing the quality of molding are detected for every shot, the detected values are compared with the preset width values of good products, and good moldings are fed to a good product position and defective moldings are fed to a defective product position. CONSTITUTION:When a molding machine 11 is in normal operation without producing any defective product, a shutter 19 is present at a partition plate 18, and a product 12 is dropped into a guide portion 16 and housed in a container 21. A runner 13 is dropped into a guide portion 17 and housed in a container 22. When the molding conditions of the molding machine 11 are out of the setting range of good product, a bad product generating signal fro the molding machine 11 is received, and a cylinder 20 is actuated, a shutter 19 is turned to the position to close the guide portion 6. Bad product is dropped into the guide portion 17 under the guidance of the shutter 19 and housed in the container 22. After the defective product passes through the shutter 19, the shutter 19 is again restored to the partition plate position by the cylinder 20.
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