Fig. 82 Line Spacing - Epson MX-82 Operation Manual

This is called "Dot Matrix Printing".
Dots are printed according to a pre-designed "Matrix" or "Grid" system, where
each letter, number and punctuation mark is formed by arrangement of dots. In
the above figure, the print head moves from left to right. Since the MX-82 is a bi-
directional printing type, the head can also move from right to left to print char-
acters
(2) Character and line spacing
Line spacing means the pitch from the top of dots that forms a character on a
line to the top of dots on the next line.
It is absolutely necessary to separate characters vertically for ease in reading
each sentence. Most typewriters and printers have a switch or lever to change
the line spacing (1/6" or 1/8"). The MX-82 also can do this of course. In addi-
tion, you can set it programmably with some ESC codes with a range from 1/72"
to 85/72".
See what happens when you set the line spacing to 1/8" and 1/6".
Look at the following figures, (a) and (b). The line spacing, i.e. the pitch from the
top of upper "g" or "G" character to the top of the "g" or "G" on the next line is
1/8". That corresponds to 9-dot skipping. If you type a "g" on the first line and a
"G" on the next line, the two characters will be close to each other. This is a little
bit hard to read in a long message including upper case characters and lower
case ones. In other uses, however, this line spacing is effective. You can under-
stand its effectiveness when using the bit image mode.
On the other hand, with 1/6" line spacing, there is no problem even if upper case
characters and lower case ones are mixed in a message. In this case, a mini-
mum of 1/24" line spacing is created between characters vertically. If you want
greater line spacing or less, input the ESC A control code.
(a) 1/8" line spacing
Fig. 62 Line Spacing
(b) 1/6" line spacing
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