Brother PT-2500PC, Service Manual, Page: 15 / 79

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2.1.2 Roller Holder ASSY Setting & Retracting Mechanism
This mechanism consists of the release lever, release rod, and roller holder ASSY.
The roller holder ASSY incorporates the platen holder and the sub roller holder. These
holders support the platen and the tape feed sub roller so that they can move
perpendicularly to the thermal head and the tape feed roller, respectively, as well as
rotating freely.
Loading a tape cassette and closing the cassette cover pushes down the release lever
which moves the 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 thermal head side.
The platen is pressed perpendicularly against the thermal head with the tape and ink
ribbon (only the tape when using non-laminated thermal film tape cassettes or stamp
tape cassettes) sandwiched inbetween under a uniform load by the platen spring. 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 sub roller
holder springs. At the same time, the sub roller gear becomes engaged with the tape
feed gear.
If you open the cassette cover, the release lever pops up by pivoting around its center
shaft since its bottom end is pulled down by the release lever spring. This retracts the
roller holder ASSY from the thermal head, providing you with enough space to replace
the tape cassette.
Fig. 2.1-2 Roller Holder ASSY Setting & Retracting Mechanism