Specifications

E–17Principles of Operation
The hammer springs forward, strikes the ribbon and paper, and leaves a dot
impression of the hammer tip on the paper.
The coil is de–energized and its field collapses while the hammer is in flight.
After striking the ribbon and paper, the hammer rebounds and the permanent
magnet recaptures it.
A line of characters is created as the shuttle scans horizontally (See
Figure E–8). All the dots in a given row of the character dot matrix are
printed in a single scan as the shuttle moves through the character columns
from one side to the other. Figure E–9 shows how a hammer forms a
character as the shuttle scans horizontally.
Characters are formed inside dot matrices, the dimensions of which vary
according to the selected font. The dot printing process continues for the
number of dot matrix rows determined by the selected font. When an entire
character line is printed, the paper feed system advances the paper to the top
dot row of the next character line to be printed. During this line advance, the
hammer bank assembly continues the right/left oscillation, but the hammers
do not print.
Dot
Row Start
Paper
Feed
Number of rows is determined by line spacing.
1
2
3
4
5
6
7
8
9
10
11
n
1
2
*
**
This row is used only for lowercase descenders.
This row is used for underlining and lowercase descenders.
*
**
One
Text
Line
Direction of Shuttle Movement
Direction
Figure E–8. Standard Character Formation