Epson FX-100 User Manual download pdf (Page 67)

Figure

3-1

shows one each of lower- and uppercase letters. The p gives

an example of the way a few lowercase letters use the bottom two

rows of the matrix. All numbers, uppercase letters, and most symbols

are formed within the top seven rows of the matrix.

Main columns

The construction of the print head restricts the maximum height of

any character to nine dots.

As shown in Figure

3-2,

the print head uses

a vertical column of nine pins (actually, wires). Because there is only

one column of pins, the head must move sideways sequentially to

each of the different column positions of the matrix, then fire the

appropriate pins. Electrical impulses cause the FX to fire pins at the

paper. As a pin is fired, it presses against the ribbon to produce one dot

of the matrix. At each position, the printer fires only the pins that are

necessary to print the current column of the character.

Figure 3-2. The print head

To print a capital H as in Figure

3-2,

the print head fires pins

through

in column 1; pin

columns

2,3,

and

and pins

through

again

in column

1 2 ... 62 63 64 65 66 67 68 69 70 71 72 ... 267 268

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Epson FX-100 User Manual Page 67