Brother P-touch PRO DX PT-9200DX, Service Manual

Page: 16 / 104

II - 3
2.1.2 Roller Holder Assy Setting and Retracting Mechanism
This mechanism consists of the release cam, roller release rod, and roller
holder/head 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.
The platen is pressed perpendicularly against the thermal head under a uniform
load regardless of the thickness of the tape, so that the tape is fed.
Closing the cassette cover pushes down the release cam which moves the roller
release rod to the left (when viewed from the front of the machine). This pivots the
roller holder assy around the shaft secured on the thermal head assy so as to press
the roller holder assy against the thermal head.
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.
Opening the cassette cover causes the release lever spring to slide the roller
release rod in the direction of the arrow. 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 and Retracting Mechanism
Tape cassette
Platen idle gear
Tape feed roller
Adhesive base tape
Platen roller
Tape feed sub roller
Roller holder assy
Roller release rod Thermal head assy
Roller holder shaft
Release cam
Ink ribbon
Laminated tape
Platen gear
Platen roller
Platen spring
Sub roller spring
Roller holder
Sub roller gear
Sub roller