Frame structure of a printer with positioning openings

摘要

A printing apparatus such as a printer of the type using a type wheel includes two guide members which extend between a pair of side frames and each of which is fixed by riveting. A carrier is slidably mounted on the guide members. A carriage loaded with a type wheel and others is mounted on a carrier in such a manner as to be rotatable by 90 degrees between a predetermined print position and a wheel replace position behind the print position. A sensor for determining the presence/absence and the kind of a type wheel loaded in the carriage is provided.