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

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II - 5
(2) Adhesive Base Tape Feeding (only for laminated tape cassettes)
A laminated tape cassette contains both a transparent laminated tape roll and
a separate adhesive base tape roll.
When a transparent laminated tape and an adhesive base tape pass through
the contact point (between the tape feed roller and tape feed sub roller), they
are then bonded together into a single, printed tape. The ink printed on the
laminated tape is, therefore, sealed up with the adhesive base tape.
(3) Ink Ribbon Feeding (except for non-laminated thermal film tape cassettes and
stamp tape cassettes)
As the main motor rotates, the ribbon drive cam located at the middle of the
gear train rotates counterclockwise. When fitted on the ribbon drive cam, the
ribbon take-up roll in the tape cassette also rotates to take up the ink ribbon.
To apply proper tension to the ink ribbon between the platen roller and the
ribbon drive cam, the feed amount of the ribbon drive cam is slightly greater
than that of the tape feed gear. The difference between the feed speeds at
the platen roller and at the ribbon drive cam is absorbed by the clutch spring
which is integrated in the ribbon drive cam and allows the cam to slip.
This way, the ink ribbon is kept tense, which enables the ribbon to clearly
separate from the tape at the stabilized angle after printing.
Fig. 2.1-4 Ribbon Feed Mechanism
Tape feed roller
Tape feed sub roller
Platen roller
Roller holder assy
Thermal head assy
Ink ribbon
Ribbon take-up roll
Main frame
Tape feed motor
Ribbon drive cam