Brother PT-530 Service Manual page 21

n Adhesive Base Tape Feeding (only for laminated tape cassettes)
A laminated tape cassette contains both a transparent laminate tape roll and a separate adhesive
base tape roll.
When a transparent laminate 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 laminate tape is, therefore, sealed up with the adhesive base
tape.
n 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 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 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 2.1-4 Ribbon Feeding Mechanism
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