II-2
2.1.2 Platen Roller, (Tape Feed) Sub Roller Setting & Retracting Mechanism
This mechanism consists of the holder cam (cassette cover ASSY) and the roller holder ASSY.
The roller holder ASSY supports the platen roller and the sub roller so that :
Ÿ the platen roller can move perpendicularly to the thermal head and rotate freely and
Ÿ the sub roller can move perpendicularly to the tape feed roller and rotate freely.
By closing the cassette cover ASSY, the holder cam of cassette cover ASSY pushes the roller
holder ASSY toward thermal head side by pushing A face of the roller holder ASSY.
The platen roller is pressed perpendicularly against the thermal head with the tape and ink ribbon
(only the tape when using non-laminated thermal film tape cassettes) sandwiched inbetween under
a uniform load by the roller holder springs (upper and lower). Also, the (tape feed) sub roller is
pressed perpendicularly against the tape feed roller built in the tape cassette with the tape (the
laminate tape and adhesive base tape when using laminated tape cassettes) sandwiched
inbetween by the roller holder springs (upper and lower) and at the same time the (tape feed) sub
roller gear becomes engaged with the tape idle gear.
Opening the cassette cover ASSY, (the holder cam of the cassette cover ASSY is released from
the roller holder ASSY), retracts the roller holder ASSY from the thermal head, providing you with
enough space to replace the tape cassette.
Fig. 2.1-2 Platen and (Tape Feed) Sub Roller Setting & Retracting Mechanism
Laminate tape
Roller holder ASSY
Shaft
Platen idle gear
Holder cam
A
Platen roller
Adhesive base tape
Thermal head
Ink ribbon
(Tape feed) sub roller
Tape feed roller
Tape cassette
Roller holder lower spring
(Tape feed) platen gear
(Top)
(Tape feed) sub roller gear
Roller holder release spring
Platen roller
Roller holder upper spring
(Tape feed) sub roller
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