CHAPTER 5

DRIVE METHOD

Drive the motor and the thermal head at the same time for printing. Figure 5-1is a timing chart for driving using two divisions. Figure 5-1is an example of acceleration control of the motor, data transfer to the head and two-divisions of the head.

Timing chart of Figure 5-1is 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.

5-1