| 摘要 |
In the production of sacks or bags provided with soldered bases, the correct folding of the bases is verified while the bags are being successively conveyed transversely to their longitudinal axes and while they are in a flattened condition with each folded base perpendicular to the remainder of the bag. Verification is effected by photocells activated by a cam plate of the bag-making machine. The photocells are electrically connected to circuits which compare certain dimensions of the bases with desired values therefor, a defective bag destined to be eliminated being indicated by a departure from the desired value.
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