High-Speed Text Quality Matrix Printer
Original Publication Date: 1980-Jun-01
Included in the Prior Art Database: 2005-Feb-13
The lifting wire matrix print head, as shown in the IBM Technical Disclosure Bulletin 20, 5097-5098 (May 1978), allows additional dots to be placed in the vertical lines when using a wire matrix printer. This is accomplished by making a second pass, one half dot higher than the first pass, across each line, thus doubling the vertical dot density within the character cell. In addition to doubling the vertical density by lifting the print head, the horizontal density can be doubled by slowing the horizontal speed to one half of its normal speed. Using the lifting print head and slower speed, text quality printing is printed at approximately one fourth the speed of normal matrix printing, that is, a horizontal speed reduction of one half and two passes per line to print vertically.