Ribbon Feed Mechanism - Citizen CL-E700 series Technical Manual

2-1-4. Ribbon Feed Mechanism

The major components of the ribbon feed mechanism are:
(a) SA Ribbon Motor F
(b) SA Ribbon Tension Shaft F
(c) SA Ribbon Sensor (Ribbon tension sensor)
Ink ribbon is set to the take-up reel (SA Holder R Shaft) and the supply reel (Holder Ribbon Shaft
Encoder) via the supplied ribbon holders.
As the ribbon motor "SA Ribbon Motor F" on the take-up side turns in the direction shown in the
figure, the take-up reel (Gear 5F Ribbon) is driven via the "Gear Reduction Ribbon 1", "Gear 2
Ribbon", "Gear 3 Ribbon" and "Gear 4 Ribbon".
The ribbon is supplied from the supply reel via the "Roller Ribbon Guide R" and "SA Ribbon
Tension Shaft F", and then taken up.
A back tension generating mechanism that is formed by the "SA Ribbon Tension Unit R" and
"Sprint Ribbon Return R" is directly connected to the supply reel. When the ribbon is supplied, the
back tension generating mechanism gives an appropriate back tension to the ribbon.
Gear 5F Ribbon
SA Ribbon Motor F
Gear Reduction Ribbon 1
Gear 2 Ribbon
Gear 3 Ribbon
SA Ribbon
Tension Shaft F
SA Platen
Taku-up Side
Take-up Reel
(SA Holder R Shaft) (Holder Ribbon Shaft Encoder)
Gear 4 Ribbon
SA Head
[Right side view]
(d) SA Ribbon Tension Unit R
(e) Ribbon gear train
[Back Tension Generation Mechanism]
Supply Side
Supply Reel
Ribbon
Roller Ribbon Guide R
Media
2-11
Chapter 2 Operating Principles
2-1.
Operation of Each Mechanism
SA Ribbon Tension Unit R
Spring Ribbon Return R
CL-E700 series