Tape & Ribbon Feed Mechanism - Brother PT-2420PC Service Manual

2.1.4 Tape & Ribbon Feed Mechanism
This mechanism consists of a DC motor, gear train, and roller holder ASSY.
(1) Tape Feeding
When you load a tape cassette and close the cassette cover, the platen and the thermal
head sandwich the tape and ink ribbon (only the tape when using non-laminated thermal file
tape cassettes) inbetween. Also, the tape feed sub roller in the roller holder ASSY and the
tape feed roller inside the tape cassette sandwich the tape (and base paper when using
laminated tape cassettes) inbetween, as described in Subsection 2.1.2.
As the DC motor rotates, the rotation is transmitted via the gear train to the P idle gear
(which rotates the platen gear) and the tape idle gear (which rotates the tape feed roller and
tape feed sub roller at the same rotation speed).
Accordingly, the sandwiched tape and ink ribbon will be advanced. (When a laminated tape
cassette is mounted, the sandwiched laminate tape, adhesive base tape, and ink ribbon will
be advanced together.)
The feeding amount of the platen is slighty less than that of the tape feed sub roller.
Adhesive base tape
P idle gear
Tape feed roller
(Tape idle gear)
Tape feed sub roller
Tape idle gear
Platen
Roller holder ASSY
DC motor
P idle gear
Fig. 2.1-5 Tape Feeding Mechanism
II-5
Transparent laminate tape
Thermal head
Chassis