Word processor with font exchanging font synthesizing mode, and spacing mode of operation

摘要

A daisy wheel printing unit includes a wheel data memory housing wheel data such as kinds of characters provided in the daisy wheel by which it can be discriminated. The printing unit compares printing commands supplied to the printer and discriminates whether or not the characters to be printed included in the daisy wheel now being set in the printer. If it is discriminated that the characters to be printed are not included in the daisy wheel now being set in the printer, the user of the daisy wheel printing unit can select a desired printing mode from a plurality of printing modes including treatment for the above characters before the start of the printing operation of the document.