Tape & Ribbon Feed Mechanism - Brother P-touch PT-2730 Service Manual

2.1.2 Tape & Ribbon Feed Mechanism
This mechanism consists of the tape feed motor (DC motor), gear train, and roller holder
ASSY.
■ Structure of Thermal Head
When you load a tape cassette and close the cassette cover, the tape feed roller inside
the cassette and the tape feed sub roller in the roller holder ASSY sandwich the tape
(the laminate tape or adhesive tape when using laminated tape cassettes) inbetween,
as described in Subsection 2.1.1.
As the tape feed motor rotates, the encode gear rotates together. (The rotation of the
encode gear is controlled by the photo interrpter ASSY.)
Then, the rotation is transmitted to the tape idle gear (which rotates the tape feed sub
roller gear) and platen idle gear (which rotates the tape feed platen gear) through the
gear train, so that the tape and ink ribbon to be sandwiched inbetween are fed forwards.
(The laminate tape, adhesive tape and ink ribbon to be sandwiched inbetween are fed
when using laminated tape cassettes.)
The feed amount of the platen is slightly less than that of the tape feed sub roller.
Adhesive tape
Tape feed roller
(Tape feed)
sub roller gear
Tape idle gear
Platen idle gear
Platen roller
Roller holder ASSY
Figure 2.1-2 Tape Feeding Mechanism
Head ASSY
Tape feed motor
(DC motor)
Chassis ASSY
II - 2
Transparent
laminate tape
Photo interrupter ASSY
Encode gear