SX
™
Service and Maintenance Manual 2-6 960714-02B © 2007 I2407
SECTION 2 – MAINTENANCE AND ADJUSTMENTS
MACHINE ADJUSTMENTS
CHECKING BELT TENSION
Sharp SX
The Sharp
SX
has three belts, one which drives
the pressure jaw and two that drive the film feed
drive roller. To ensure proper operation of the
machine, these belts need to be checked for proper
tension to avoid slip.
1.
With machine power disconnected, remove
the left side frame guard. Remove the two
screws on the rear face plate, the two screws
on the front face plate, and the two screws on
the middle unwind plate (Figure 2-6).
2.
Locate the pressure jaw drive belt (Figure 2-
7). Depress the center of the belt to
determine if the tension is appropriate. The
belt should deflect approximately 1/8” when
depressed with one finger at the center of the
longest belt span.*
3.
If the belt deflects more than 1/8 loosen the
four motor mounting screws and apply
downward pressure to the pressure bar drive
motor. When motor is in desired position for
proper belt tension, tighten four screws and
verify the belt deflects the recommended
amount. Repeat until belt is correctly
tensioned.
4.
Locate the film feed motor drive belt (Figure 2-
7). Repeat the process in step two to check
for correct tension. This belt should deflect
approximately 3/32” at proper tension. If too
tight or too loose, repeat step three on the film
feed drive motor.
*
Note: Belt tension should be just enough to ensure
a positive interference between belt and sprocket
teeth without allowing them to jump. If too tight, the
load may cause undue stress on the shafts and
shorten belt life. If too loose, the belt will not
engage the sprocket properly and the drive will slip
under normal loads. For a more detailed method of
determining proper belt tension, contact Sharp
Packaging Systems customer service or consult
the belt manufacturer.
Always remove electrical power from the
SX
prior to performing any maintenance
on the machine.
WARNING
Figure 2-7. Pressure Bar and Film Feed Belts
Pressure Jaw
Drive Belt
Film Feed Motor
Drive Belt
Figure 2-6. Frame Cover Screws