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    • 91. 发明授权
    • Dot printer with a reduced average number of dot-expansion operations
    • 点阵打印机平均点扩展操作次数减少
    • US5371838A
    • 1994-12-06
    • US88091
    • 1993-06-22
    • Kenichi FujiiHisashi UemuraMotoki Matsubara
    • Kenichi FujiiHisashi UemuraMotoki Matsubara
    • G06K15/02G06F15/00
    • G06K15/02G06K2215/0062G06K2215/008
    • 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.
    • 本发明涉及将接收的打印数据转换为要打印的点图案的类型的点式打印机。 这种打印机主要包括:将打印数据存储为固定部分数据和可变部分数据的主存储器; 用于识别固定部分数据和可变部分数据的机构; 以及用于存储在存储在主存储器中的打印数据上执行通常称为“点扩展”的操作的结果的缓冲器或缓冲器。 将缓冲器的内容应用于打印头,打印头依次在一张纸上打印点图像。 由于CPU点扩展并将主存储器中的可变部分数据重新构建到缓冲区中,因此消除了与点扩展固定部分数据相关联的不必要的计算。 此外,如果使用两个缓冲器,则第一缓冲器可以在打印头正在操作的同时保持点扩展数据,而另一个缓冲器正在填充点扩展数据,以便在印刷内容之后打印 第一缓冲区。 将主存储器分割为固定部件数据和可变部件数据以及双缓冲器方案允许本发明的打印机比常规点阵打印机更快地打印文档。