Chapter Ii Theory Of Operation; Main Mechanisms; Roller Holder Assy Setting & Retracting Mechanism - Brother P-touch PT-2730 Service Manual

CHAPTER II THEORY OF OPERATION

2.1 Main Mechanisms

2.1.1 Roller Holder ASSY Setting & Retracting Mechanism
This mechanism consists of the roller release lever, roller holder release rod, and roller
holder ASSY.
The roller holder ASSY supports the platen roller and the tape feed sub roller so that
they can move perpendicularly to the head ASSY and the tape feed roller, respectively,
as well as rotating freely.
Loading a tape cassette and closing the cassette cover pushes down the roller release
lever which moves the roller holder release rod to the left (when viewed from the front of
the machine). This pivots the roller holder ASSY around the shaft provided on the
chassis so as to press the roller holder ASSY against the head ASSY side.
The platen roller is pressed perpendicularly against the head ASSY with the tape and
ink ribbon (only the tape when using stamp tape cassettes) sandwiched inbetween
under a uniform load by the platen upper and lower springs. At the same time, the
platen gear becomes engaged with the platen idle gear.
Also, the tape feed sub roller is pressed perpendicularly against the tape feed roller built
in the tape cassette with the tape (and base paper when using laminated tape cassettes
or stamp tape cassettes) sandwiched inbetween under a uniform load by the roller
holder upper and lower springs. At the same time, the sub roller gear becomes engaged
with the tape idle gear.
If you open the cassette cover, the roller release lever pops up so that the roller holder
release rod retracts the roller holder ASSY from the head ASSY, providing you with
enough space to replace the tape cassette.
Adhesive tape
Platen idle gear
Tape feed roller
Tape feed sub roller
(Tape feed) sub roller gear
Figure 2.1-1 Roller Holder ASSY Setting & Retracting Mechanism
Platen roller
Roller holder ASSY
Platen roller
(Tape feed) platen gear
Tape feed sub roller
Head ASSY
Shaft
Roller holder release rod
Platen lower spring
Platen upper spring
(Top)
II - 1
Laminate tape
Tape cassette
Ink ribbon
Chassis ASSY
Roller release lever