Seiko Instruments LTP F Series - Manual (Page 57)

5-1
CHAPTER 5
DRIVE METHOD
Drive the motor and the thermal head at the same time for printing. Figure 5-1 is a timing chart for
driving using two divisions. Figure 5-1 is an example of acceleration control of the motor, data
transfer to the head and two-divisions of the head.
Timing chart of Figure 5-1 is explained in order thereinafter.
A: Pause state
Transfer the data which are printed in the first dot line to the SHIFT REGISTER in the DST1
sideof the thermal head.
B: Start step output
Output the same phase to the motor as that having been output just before the motor stopped.
The step time is the first acceleration step term.
C: First step
(1) Latches the print data transferred in step A in the LATCH REGISTER and activates the
thermal head with the DST1.
(2) Transfers the remaining data in the DST2 side to the SHIFT REGISTER in the DST2 side of
the thermal head.
(3) When the activation of DST1 is completed, the print data transferred by (2) is latched in the
LATCH REGISTER of the head and activation to the thermal head is stated with DST2.
(4) The print data printed in the DST1 side of the 2nd dot line print data is transferred to the
SHIFT REGISTER in the DST1 side of the thermal head.
(5) After the 1st step time of the motor is finished, the motor goes on to the next step.
D: Second step
(1) Latches the print data transferred in step (C) to the LATCH REGISTER of the thermal head
and starts activation with the DST1.
(2) Transfers the remaining data in the DST2 side to the SHIFT REGISTER of the thermal head
in the DST2 side.
(3) Latches the print data transferred in (2) to the LATCH REGISTER and starts activation with
the DST2 after activation of the DST1 is completed.
(4) After the second step time is completed, the motor goes on to next step.