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Drive for the timing belt motor is basically 2-2 phase excitation.
Sequence of the belt motor drive to move the carriage is as follows.
Carriage
Step
A phase
B phase
C phase
D phase
1
ON
OFF
OFF
ON
From left to right
2
ON
OFF
ON
OFF
3
OFF
ON
ON
OFF
4
OFF
ON
OFF
ON
1
ON
OFF
ON
OFF
From right to left
2
ON
OFF
OFF
ON
3
OFF
ON
OFF
ON
4
OFF
ON
ON
OFF
2. Printing function of the Print Head
This explanation is for the wire movement of one dot when one character is formed.
1) The function plate is pulled in to the core when current flows in the driving coil and thus the dot wire springs
toward the platen since it is connected with the function plate.
2) The forced dot wire springs out till it strikes the platen and one dot is printed on the paper through the ribbon
when it strikes the platen.
3) The function plate is reset to its former position by the force of the function plate spring when current no
longer passes through the driving coil.
The dot wire, after it
strikes
the platen, returns to its position, which is connected with function plate, by its
striking
force and the wire return spring and maintains itself in a waiting condition.
Dot w
i
re
Ribbon mask
Platen
Wire return spring
Nose tip
. .
R'
i b~)
\
Paper
Function plate
Function plate spring
-19-
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