Brother International PT-9600 Service Manual - Page 22

Tape Automatic Full Cutter Mechanism

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2.1.4 Tape Automatic Full Cutter Mechanism The cutter blade fixed into the carriage is moved along the lead shaft so that the tape is cut. When the worm gear provided on the edge of the cutter motor is rotated, the lead shaft is rotated together so that the carriage is moved in the direction of tape cutting along the lead shaft. The moving pitch of the carriage is approximately 4.5mm whenever the lead shaft is rotated once. The upper and lower sensors are provided on the lead shaft, where the carriage is moved between them. When the tape is cut, the carriage is placed on the home position on the lower sensor first, and then the lower sensor rotates the cutter motor while the sensor is being turned ON so that the carriage is moved in the direction of tape cutting. When the upper sensor detects the carriage, it is turned ON, and the cutter motor is rotated in reverse. Then the carriage is moved to the home position. Control plate Cassette tape Tape ejected direction Sensor PCB (upper sensor) Lead shaft HC guide shaft Cutter blade Carriage Sensor PCB (lower sensor) Helical gear Gear Cutter motor Worm gear Fig. 2.1-5 Tape Automatic Full Cutter Mechanism II-6

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II-6
2.1.4
Tape Automatic Full Cutter Mechanism
The cutter blade fixed into the carriage is moved along the lead shaft so that the tape is cut.
When the worm gear provided on the edge of the cutter motor is rotated, the lead shaft is rotated
together so that the carriage is moved in the direction of tape cutting along the lead shaft.
The moving pitch of the carriage is approximately 4.5mm whenever the lead shaft is rotated once.
The upper and lower sensors are provided on the lead shaft, where the carriage is moved between
them.
When the tape is cut, the carriage is placed on the home position on the lower sensor first, and
then the lower sensor rotates the cutter motor while the sensor is being turned ON so that the
carriage is moved in the direction of tape cutting.
When the upper sensor detects the carriage, it is turned ON, and the cutter motor is rotated in
reverse.
Then the carriage is moved to the home position.
Fig. 2.1-5
Tape Automatic Full Cutter Mechanism
Control plate
Cassette tape
HC guide shaft
Cutter blade
Lead shaft
Helical gear
Cutter motor
Tape ejected direction
Carriage
W orm gear
Sensor PCB (lower sensor)
Sensor PCB (upper sensor)
Gear