GP44 Semi-Automatic Strapping Machine
OPERATION -29-
Release Tension, Cut and Weld
NOTE: The sequence that these functions take place is that as the controlled tension is completing, the left
gripper extends to hold the tension that has been created. As the middle gripper extends to compress the two
layers of strap against the heater blade, the middle gripper shears the strap against the right gripper. After the
heater blade retracts, the middle gripper compresses the two layers of strap against each other to create the
weld.
When troubleshooting welding problems, check the appearance of the strap for evidence of contact by the
heater blade. This can be used to determine if the problem is that the heater blade is interfering and not
making it in between the strap or if the problem is elsewhere.
NEVER BEND THE HEATER BLADE WHEN IT IS COLD. THE HEATER BLADE MAY CRACK.
Symptom Cause Solution GP
The weld is
breaking and there
is no evidence of
full heater blade
contact on the strap
The heater blade is bent
or the bracket is out of
position and the heater
blade is not extending
between the straps.
Cycle the cam by hand and determine the
cause of the interference. Eliminate the
cause of the interference. Realign heater
blade and heater tower.
X
The weld is
breaking and there
is evidence of
proper contact with
the heater blade
The middle gripper is not
applying adequate
pressure to seal the
melted strap
Shim middle gripper per specification
X
The weld is
breaking and there
is evidence of
proper contact with
the heater blade
The left gripper is not
adequately gripping the
strap and allowing
movement during the
welding cycle
Shim left gripper per specification
X
The weld is
breaking and there
is evidence of
proper contact with
the heater blade
The seal anvil is cracked
or bent which is not
allowing proper
compression by the
middle gripper.
Replace the seal anvil. Re-shim the grippers
when replacing the seal anvil. Over
shimming the grippers is a typical cause of a
cracked seal anvil, therefore, they should be
checked when a seal anvil is detected.
X
The weld is
breaking and there
is evidence of
proper contact with
the heater blade
The heater blade is not
providing adequate heat.
Check heater blade, insulation and wiring.
Look for discontinuity in this circuit. Check
heater blade for build-up. Check the heater
control voltage (100V). Adjust the heater
blade tap to a lower letter.
X
The cut is not clean The left gripper is not
adequately gripping the
strap during the cutting
operation
Shim left gripper per specification
X
The cut is not clean The cutting surface on the
middle gripper is not
sharp or there is not tight
contact between the
middle and right gripper
Replace the middle gripper. Make sure the
spring holding the middle and right gripper
together is intact. X
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