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A checkweigher is an automatic machine for checking the weight of packaged commodities. It is normally found at the off-going end of a production process and is used to ensure that the weight of a pack of the commodity is within specified limits.
Checkweighers often incorporate additional checking devices such as metal detectors and X-ray machines to enable other attributes of the pack to be checked and acted upon accordingly.
A checkweigher normally incorporates a series of conveyor belts.
- An in-feed belt that may change the speed of the package and to bring it up or down to a speed required for weighing.
- A weigh belt. This is typically mounted on a weight transducer which can typically be a strain-gauge load cell or a servo-balance.
- A reject belt that provides a method of removing an out-of-tolerance package from the conveyor line.
In-motion scales are active devices that can be configured for many different applications, such as determining the total case weight at the end of the conveyor, ensuring that the completed package meets the preset weight range or detecting items missing from an order by calculating the case weight while in motion.
Checkweighers can calculate the total weight of all boxes being palletized as part of a shipment, as well as read the weight and dimensions of every package. The controlling computer can then print a bar-coded shipping label with data for the weight, cubic dimensions, destination address and other key details for quick identification.
In receiving, a corresponding checkweigher reads the label and can easily determine if the shipment is intact and notify the user if any boxes or items have gone missing in transit.
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