Mechanical Functions; Head/Platen Clearance - Tally T2265 SprintPro Maintenance Manual

Functional Description
3.2

Mechanical Functions

3.2.1
Head/Platen
Clearance
Principle
Stepper
Motor
pinion
13 teeth
WORM GEAR
"MEMORY"
The worm gear (see principle drawing) determine the basic head distance. You can
imagine the worm gear as a mechanical memory. During initialisation (power up) of
the printer the head distance stepper moves the toothed segment on block at the
worm gear. Now the printer has its basic point and can count the steps forward which
are stored in the firmware. The stepper tolerance is within one bit pattern (equals 4
steps).
Thoothed segment
Toothed wheel
84/14
B
A
Bearing point
eccenter
A
Lever
B
Mean point
carriage axle
Mechanical Functions
Adjust Area:
Tolerance
B
min. 0
Tolerance
A
max.
Head Distance
3-3