PRINTER

摘要

A printer (2) for printing security cards (14) in which two pairs of pinch rollers (22, 24) convey a substrate (14) past a print head (20). A cam follower (42) is driven by a cam (40) and is mounted on shafts of lower rollers (22a, 24a) of the pinch rollers and a shaft of a platen roller (32). The cam follower can be moved to act against upper rollers (22b, 24b) of the pinch rollers and the print head, in order to bring the pinch rollers or the print head in and out of engagement with the substrate. The printer may also include a return device (70) to urge the substrate back towards a pair of pinch rollers. The rollers can then be reversed, enabling multiple passes of the substrate past the print head or a magnetic strip encoder (36). The substrate can also be inserted and removed via a single slot (12) in the housing of the printer.