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Longman Dictionary of Contemporary English
franking machine
noun
EXAMPLES FROM CORPUS
▪ A control card showing the readings of the meter of the franking machine must also be tendered to the post office.
▪ Describe the purpose and use of a franking machine. 5.
WordNet
franking machine

n. a machine that automatically stamps letters or packages passing through it and computes the total charge

Usage examples of "franking machine".

That done, he arose, slipped on his coat, took his package across the landing to the office's postal franking machine, which scanned, weighed, and inked it with the necessary bar code.

But he always insisted on putting his own stamps on such letters, never allowing them through the Department's franking machine Bit too obviously self-righteous, she thought.