Seiko MTP Series, Technical Reference, Page: 32 / 61

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4.3.2 Home Switch Signal Method
When printing a graphic image, print a picture unit by the following method. The
print start position deviation may not occur.
1. Determine the print start position of the first line by the ON-rise of the home
switch signal (same as the home switch signal method).
2. For the second and the subsequent lines, determine the print start postion by
counting timing signals (do not stop the head at its home postion).
Example: When printing one picture unit by three lines
Figure 4-4 Continuous Printing Timing Chart (Timing Signal Count Method)
ON
Motor drive
signal
Home switch
signgal
Timing
signal
OFF
OFF
ON
1 2 3 2 2 1 1 N N
1st line
Ignored
2nd line
Ignored
3rd line
3 3
Timing signal count is started after the home switch turned ON for the first line.
When the timing signal count becomes N+1, the head completes one stroke, and
returns to the position of timing signal count 1 on the first line. At this point,
ignore the home switch signal.
For the second line, replace N+1 with 1, and proceed to the timing signal count.
When the timing signal count becomes N+1, replace N+1 with 1, and conduct
timing signal count for the third line.
Upon completion of printing the third line, detect the ON-to-OFF of the home
switch, and stop the motor to complete an operation cycle.
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