
Line Matrix Printing
Unlike
During each sweep of the shuttle, hammers are activated to print dots at selected positions in that dot row. When the shuttle reaches the end of a sweep, it reverses direction, paper advances one dot row, and the hammers print the next consecutive row of dots.
After a line of characters is printed, hammer print action ceases while the paper advances to the first dot row of the next print line. The number of rows allowed for line separation depends on the line spacing selected.
ONE
CHARACTER
ROW
DIRECTION OF SHUTTLE MOVEMENT
DOT
ROW START
1 |
|
2 |
|
3 |
|
4 |
|
5 |
|
6 |
|
7 |
|
8 | * |
9 | * * |
10 |
|
11SPACE
12
1
2
1 HAMMER | 1 HAMMER |
PRINT SPAN | PRINT SPAN |
PAPER
ADVANCES
PAPER
FEED
PAPER
ADVANCES
**
* USED FOR LOWERCASE DESCENDER ONLY
** USED FOR UNDERLINE AND LOWERCASE DESCENDER
Figure 1–2. Line Matrix Printing
Overview |