5-2
5.2 MOTOR DRIVE TIMING
To print, the phase of motors need to be synchronized with that of the thermal head.
As example, the print method which divides one dot line to two groups; the block 1,3, and 5 and the block
2,4, and 6, and prints each group data for each step of the motor is described below.
The basic pulse width of the motor drive pulse, Tm, is a value (unit: msec) of the reciprocal number of the
driving frequency calculated using equation (1) of
"3.3 PAPER FEED CHARACTERISTICS"
.
Pause State
Transfer the print data to the thermal head according to
"5.1 THERMAL HEAD DRIVE TIMING"
.
Start up phase
Excite the phase which is output just before the motor stops for the time of the start up step
shown in Table 3-5.
1st line, 1st step
Drive the motor by one step (1st step). The step time should be the acceleration 1st step time or
Tm, whichever is longer.
Set DST for the block 1, 3, and 5 to “High” in synchronization with the motor drive.
After setting DST to “High”, set DST to “Low” when the driving time calculated in
“3.6
CONTROLLING THE HEAD ACTIVATION (DST) PULSE WIDTH”
has passed.
Move to the 2nd step after completion of the 1st step time of the motor and the activation of
blocks 1, 3, 5.
1st line, 2nd step
Drive the motor by one step (2nd step). As to how much step time is output, compare Tm with the
time that was taken in the previous step.
(1) In case Tm < the time that was taken in the previous step,
the next closest acceleration step time to the previous step time or Tm, which is longer, is output.
(2) in case Tm > the time that was taken in the previous step,
the closest acceleration step time to Tm and the acceleration step time that is larger than Tm, are
output.
Set DST for blocks 2, 4, and 6 to “High” in synchronization with the motor drive. After setting DST
to “High”, set DST to “Low” after completion of the head activation time. Transfer the print data of
the next dot line to the thermal head after completion of printing for blocks 2, 4, and 6.
Move to the 2nd dot line after completion of the 2nd step time of the motor and the transfer of print
data for the next dot line.
Summary of Contents for LTPH245
Page 1: ...Seiko Instruments Inc LTPH245 LINE THERMAL PRINTER MECHANISM TECHNICAL REFERENCE U00055332011 ...
Page 31: ...3 18 3 5 7 Timing Chart Figure 3 10 Timing Chart ...
Page 60: ...7 3 Figure7 2 Printer Main Body Appearance and Dimensions LTPH245D C384 E Unit mm ...
Page 62: ...7 5 Figure7 4 Printer Main Body Appearance and Dimensions LTPH245E C384 E Unit mm Unit mm ...
Page 63: ...7 6 Figure7 5 Platen Block Appearance and Dimensions Unit mm ...
