Ribbon Feeding System; Color Changing System - Samsung SRP-275 Service Manual

SRP-275

8-1-3 Ribbon feeding system

When the HF motor rotates CCW(CounterClockWise) and the HF motor pinion rotates in the direction of
arrow A, Gear-RE(REduction)_B, Gear-RE_A and Gear-RE_B' rotate in the directions of arrows B, and C,
D respectively. This causes the Lever ribbon feeder ass'y to move in the direction of arrow E, rotating
round the Shaft-reduction A/C in the center, until the Gear-RE_B' goes in with the Gear-RE_C.
Since the Gear-RE_C and the Ribbon feeder ass'y are always engaged, the Ribbon feeder ass'y rotates
in the direction of arrow G.
When the HF motor rotates in the reverse direction and the HF motor pinion rotates in the direction of arrow
a, the Lever ribbon feeder ass'y moves in the direction of arrow e, disengaging the Gear-RE_B' from the
Gear-RE_C.
Therefore, the Ribbon feeder ass'y rotates in the direction of arrow G only when the HF motor rotates CCW.
Then the Ribbon feeder and ribbon hold rollers in the Ribbon cassette, which are engaged with the
Ribbon feeder ass'y, rotate and the ribbon is fed.
Ribbon feeder ass'y
Lever ribbon feeder ass'y
Pinion HF motor
Shaft-reduction A/C
F
a
E
A
e
C
G
D
B
Gear-RE_C
Gear-RE_B
Gear-RE_B΄
Gear-RE_A

8-1-4 Color changing system

Color change system consists of Ribbon feeding system in section 8-1-3 and Ribbon shifting system in
section 8-1-4-1
8-1-4-1 Ribbon shifting system
Shifting system of Ribbon consisted of Carriage head ass'y, Frame-ribbon, Lever-change color,
Solenoid and Spring-solenoid as show in figure.
Ribbon shifting action is as follows.
When you'd like to change from black color to red color, you should move the Carriage head ass'y. As the
HF motor rotates CW(ClockWise), Carriage head ass'y moves from left to right. As Carriage head ass'y
moves to right, it dashes against Frame-ribbon(A), and Frame-ribbon is in shift up(B), and Lever-change
color is turn by Spring-solenoid(C). And then printing color is printed by red.
At this moment, if you'd like to change from red color to black color, you should control Solenoid. If not
energized in Solenoid, plunger are not moved, and so Lever-change color does not turn, and Frame-ribbon
is not in shift down. As Solenoid moves energized, and plunger pulls and Lever-change color turns(D), and
Frame-ribbon is in shift down(E). And then printing color is printed by black.
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