In Motion Checkweigher Problems Solved

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Sep 18, 2013

Many in motion checkweigher problems may be similar, there are several ways to solve them. It’s been said of some people that they are generous to a fault.  The same thing can be said about companies that do not exercise proper Quality Control by checking product weights and piece counts following packaging.

Every manufacturer knows that selling underweight products or products with a lower piece count than what is stated on the label is a quick route to legal trouble.  However, attempting to avoid legal trouble by over-packing is usually the wrong answer for two reasons.

The first and most obvious reason is the cost to the bottom line.  This type of generosity squeezes profits by forgoing revenue that is due to the company and its stakeholders.

In-Motion Checkweigher with Alarm Light and Reject Mechanism

But a less obvious reason is that generosity in product give-away may adversely affect your customers.  This point was driven home to me recently by an engineer with a telecommunications company.  He had a customer complaint when a package said it contained 10 connectors when, in fact, it had 11.

After that customer manufactured its product and found it had a left-over connector, it searched in vain to find its error, but it was the telecommunications company that had been generous to a fault. The result was a very frustrated customer.

We showed the telecommunications engineer that we can “count” the pieces in each box on our in-motion checkweigher at speeds that won’t put his company back in the Stone Age.

Speed is just what you get with in-motion check weighing.  An in-motion checkweigher is a conveyor scale (meaning that product does not need to stop to be weighed) with one additional feature: a divert mechanism. A divert mechanism can be an air blast, a linear thrust device, a drop-down, or any other means of removing products that are not within a specified tolerance range.


If your product inspection needs to be Legal For Trade, we can design an in-motion checkweigher with division sizes as low as 0.005 lbs or for a capacity as high as 200 lbs.  The rule for a Legal For Trade in-motion checkweigher is 2,000 divisions of the load cell’s capacity.


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