Dot printer with a reduced average number of dot-expansion opera

Details Dot printer with a reduced average number of dot-expansion opera Dot printer with a reduced average number of dot-expansion opera

1993-06-22

1994-12-06

Evans, Arthur G.

395112, G06F 1500

Patent

active

053718380

ABSTRACT:
This invention relates to a dot printer of the type in which received printing data are converted into dot-patterns to be printed. A printer of this type mainly comprises: a main memory which stores the printing data as either fixed part data and variable part data; a mechanism for identifying the fixed part data and the variable part data; and a buffer or buffers for storing the result of performing an operation, usually called "dot-expansion," on the printing data stored in the main memory. The contents of the buffers are applied to the printing head, which in turn, prints dot-images on a sheet of paper. Because the CPU dot-expands and recopies only the variable part data in the main memory into the buffer, a needless computation associated with dot-expanding fixed-part data is eliminated. In addition, if two buffers are used, a first buffer may hold dot-expanded data while the printing head is operating and while the other buffer is being filled with dot-expanded data, to be printed subsequent to the printing of the contents of the first buffer. Segmenting the main memory into fixed part data and variable part data and two-buffer scheme allow printers of the present invention to print a document faster than conventional dot-printers.

REFERENCES:
patent: 4516139 (1985-05-01), Takiguchi
patent: 4553860 (1985-11-01), Imaizumi et al.
patent: 4780008 (1988-10-01), Ueno et al.
patent: 4944614 (1990-07-01), Tanaka
patent: 5113491 (1992-05-01), Yamazaki

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