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4.6.2
DC Motor Drive and Sensor Circuit
Paper feed and ribbon feed motors are + 12 V bi-directional DC motors, controlled by IC10, which is able to drive
two motors at different times.
The driving motor (paper feed or ribbon feed) is selected by the signal received
from Port 65 and 66 of CPU (IC1) and the direction of motor rotation (index or reverse index) is dependent on the
signal received from Port 67 of IC1, as indicated in the truth table.
SW501 (ribbon feed sensor) is used to monitor the position of the drive cam by detecting the position of a magnet
mounted on the Gear.
SW502 (paper feed sensor/carrier home sensor) is used to monitor the position of the intermediate gear by a cam
mounted on the gear.
And also SW502 is used to detect the carrier home position, when the power switch is
turned on.
Truth Table
Timing Chart
Ribbon Feed Motor
Paper Feed Motor
|
|
Output OUT1, OUT COM | Output OUT2, OUT COM
IN1
NA
| PAPER FEED/
у
99! CRRRIER HOME SENSOR
PAPER FEED MOTOR
aa SS
eae See
yee
1
RIBBON
FEED
SENSOR
i
os s ai
|
o
RIBBON FEED
|
9
MOTOR
4-16
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