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5. PRINTER MECHANISM CONTROL SYSTEM
5.1
Head Drive
5.1.1 Thermal Head Control System
The LT-286 is driven by this LSI has a 1-line printing head divided into 6 blocks of 64 dots each.
With this LSI, you can choose either a Fixed Division Number System which drives the printing
head by always dividing it into 6 blocks of 64 dots each or a Variable Division Number System
which simultaneously drives it by consolidating several blocks according to the number of
activate head dots. This selection is made with a function selection terminal or command.
For selecting with the function selecting terminal, see "4.16 Function Selection Circuit." For
selecting with the command, see "10.2 Command Details."
(1) Fixed Division Number System
The blocks of the printing head to be simultaneously driven have been determined in advance.
Printing is performed, dividing into 6 blocks of 64 dots each from the left corner of the printing
surface of the printing paper. Since the printing head is always driven in the same
order, this method can assure high-quality printing.
In the Fixed Division Number System, the blocks of the printing head driven in the 1st and 2nd
steps of the motor have been determined as shown in Fig. 5.1.
Fig. 5.1
1st Block;
64 Dots
(2) Variable Division Number System
This method counts the number of printing dots for each block of each printing head in the
printing dot line and drives the blocks collectively in such a manner not to exceed the maximum
number of driving dots(64 dots).
Fig. 5.2 shows an example when the number of printing dots in every block of 1 to 6 is 64 dots
or less.
Fig. 5.2
1st Block;
64 Dots
Different from the Fixed Division Number System, this method drives all the printing
heads in the 1st step of the motor and simply feeds the paper in the 2nd step of the motor.
2nd Block;
3rd Block;
64 Dots
64 Dots
1st Step of Motor
2nd Block;
3rd Block;
64 Dots
64 Dots
1st Step of Motor
4th Block;
64 Dots
2nd Step of Motor
4th Block;
5th Block;
64 Dots
64 Dots
33
CBM-202PC-04 User's Manual
5th Block;
6th Block;
64 Dots
64 Dots
6th Block;
64 Dots
2nd Step of Motor
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