| 摘要 |
<p>A metering device, for example a parking meter, for use with a magnetic card. A card driving wheel (W) and a magnetic data processing head (H) are at the mid-point of a transport path (P) which is twice the length of the card (C). For a metering operation the driving wheel (W) is started when a card (C) has been manually inserted to where its rear edge is level with the front face (FA) of the device and the magnetic head (H) then reads data from the card during a fully forward drive, after which the magnetic head (H) modifies some of the data on the card during a backward drive to a position where it does not emerge from a recess (RC) in the front face (FA), after which the magnetic head (H) reads data from the card during a further fully forward drive, after which the card is driven fully backward so that it then emerges from the recess (RC) and can be manually withdrawn from the device.</p> |
