fare adjustment machine; ticket adjustment machine
A machine found at train stations and parking lots where you pay the difference when your ticket or pass has insufficient fare.
There is a fare adjustment machine near the ticket gate at the station.
I paid the fee at the parking lot's ticket adjustment machine.
A ticket vending machine for purchasing new tickets, not for adjusting fares.
automatic fare adjustment machine
Compound of 精算 (せいさん, 'adjustment of accounts') + 機 (き, 'machine').