IBM 6400-I15 Maintenance Manual - Page 35
Chapt 4 Principles of Operation, Line Matrix Printing
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4 Principles of Operation Line Matrix Printing The printer creates characters and graphics by printing patterns of ink dots on paper, an entire line at a time. This technique is called line matrix printing. Every text character is stored in printer memory as a pattern of dots on a logical grid called the dot matrix. (See Figure 8.) The ink dots are made by a row of small hammers mounted on a shuttle that sweeps rapidly back and forth. Printer logic circuits divide every line of incoming data into horizontal dot rows. The hammers put dots at the required positions for the entire line by striking an inked ribbon and the paper. 1 0.00835 inch Column No. 12 0.10 inch 0.01389 inch First row and column of next character column (at 10 cpi) First row and column of next character line (at 6 LPI) 0.02 inch Lowest descender dot line Figure 8. A Dot Matrix Principles of Operation 35
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