Brother International PT-9600 Service Manual - Page 21

Fig. 2.1-4, Ribbon Feed Mechanism

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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. Ink Ribbon Feeding (except for AV labels 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. Tape feed roller Tape feed sub roller Platen Main frame Ribbon take-up roll Thermal head ASSY Ink ribbon Roller holder ASSY Ribbon drive cam Fig. 2.1-4 Ribbon Feed Mechanism II-5 Tape feed motor

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II-5
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.
Ink Ribbon Feeding (except for AV labels 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.
Fig. 2.1-4
Ribbon Feed Mechanism
Tape feed roller
Tape feed sub roller
Platen
Roller holder ASSY
Thermal head ASSY
Ink ribbon
Ribbon take-up roll
Main frame
Ribbon drive cam
Tape feed motor