Brother PT 1000 - P-Touch 1000 B/W Thermal Transfer Printer, Service Manual

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Adhesive Base Tape Feeding (only for laminate tape cassettes)
A laminate tape cassette contains both a transparent laminate tape roll and a separate
adhesive base tape roll.
When a transparent laminate tape and 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 laminate tape is, therefore, sealed up with
the adhesive base tape.
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Ink Ribbon Feeding
As the drive 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 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.
Figure 2.1-6 Ribbon Feeding Mechanism