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ER-04RP
The two-color ribbon cartridge (D type) is mounted on the ribbon
plate, and the mono-coior type (M type) on the frame.
Mono-color ribbon cartridge mounted in position
Two-color ribbon cartridge mounted in position
[Safety mechanism]
If the ribbon gear binds because of a ribbon jam, the motor
may be subjected to overload, causing gear tooth breakage,
motor coil burning, and other troubles. To prevent such
troubles, the ribbon slip gear is coupled by friction to the
drive pulley via the ribbon slip spring, and is so constructed
that it slips in the drive pulley when the ribbon feed system is
subjected to overload.
Drive pull
Fixed
Ribbon slip spr
Ribbon slip g
(7) Color change mechanism block (for D type only)
The mechanism block consists of a ribbon plate on which to
mount a ribbon cartridge, a color change lever, a color change
solenoid, a ribbon reset cam, and a reset cam drive gear.
In normal operating condition, the ribbon plate is locked in posi-
tion by the lower hook of the color change lever, holding the
black ribbon area in the printing position. When the color change
solenoid is energized through a red print command, the color
change lever is pulled in to disengage the lower hook from the
ribbon plate. The color change lever swings upward by the force
of the color change lever, hitting the upper hook of the color
change lever. The fibbon plate is thus retained by the upper
hook, setting the red ribbon area in the printing position for red
printing. When the printing is completed, the ribbon plate is
pulled downward by the ribbon reset cam, engaged with the
lower hook of the color change lever, and reset to the original
position (black printing position).
The timing is so set that the ribbon reset cam will be operated
when the printhead is in a non-printing area at the extreme right
or left, to avoid accidental resetting during printing.
Ior change
solenoid
ge lever
Color c~ange spring
%
~ib)on re,et cam
[Black printing]
I in
printing]
[Resetting]
I
table
Fixed
-17-
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