Brother P-touch PT-2730 Service Manual page 14

■ Adhesive tape Feeding (only for laminated tape cassettes)
A laminated tape cassette contains both a transparent laminate tape roll and a separate
adhesive tape roll.
When a transparent laminate tape and an adhesive 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 transparent laminate tape is, therefore,
sealed up with the adhesive tape.
■ Ink Ribbon Feeding (except for stamp tape cassettes)
As the tape feed motor rotates, the ribbon drive cam located at the middle of the gear
train rotates counterclockwise. The ribbon take-up roll in the tape cassette, which is
engaged with the ribbon drive cam, 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 roller. The difference between the tape 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 proper tense, which enables the ribbon to clearly
separate from the tape at the stabilized angle after printing.
Tape feed roller
(Tape feed)
sub roller gear
Platen roller
Roller holder ASSY
Ribbon drive cam
Figure 2.1-3 Ribbon Feeding Mechanism
II - 3
Ribbon take-up roll
Head ASSY
Tape feed motor
(DC motor)
Chassis ASSY