Nitta Belt Welding Instructions
This procedure outlines the correct method for welding Nitta conveyor belts, ensuring a strong, precise, and durable splice. Following these instructions guarantees optimal belt performance, alignment, and longevity in material handling systems.
ResMed - Atlanta
07/21/2025
Nitta Belt Welding Instructions
This procedure outlines the correct method for welding Nitta conveyor belts, ensuring a strong, precise, and durable splice. Following these instructions guarantees optimal belt performance, alignment, and longevity in material handling systems.
WARNING Lockout Tag Out
Lockout and Tag all Pneumatic and Electrical equipment running to affected area.
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Depending on your work zone area, there may be three (3) different finger guards. Those between the pressure lift assemblies simply snap-in or out. Those over the pressure assemblies are removed by rotating a quarter turn clockwise and pulling out. If the belt splicing work area includes a crossmember, a different shape finger guard is used which also snaps into place. WARNING: After Maintenance, REPLACE guards immediately
Remove rollers between two pressure pan supports in a 3' zone. Any zone can be selected, but it is easier to select one near the charge or discharge end of the conveyor. Note: Pull the acles with pliers to protect the frame.
Note: it is best to try and get the belt as flat as possible.
Is belt being replaced
if the answer is "oneOf [No]"
For New Installation Use the NBC Treading tool (located and attached under each drive from factory). NBC Threading instructions are also in TGW IOM Manual at www.tgw-conveyor.com
if the answer is "oneOf [Yes]"
When replacing an existing belt, cut the previous belt straight across using a straight edge.
if the answer is "oneOf [Yes]"
Duct tape the top and bottom of the old belt end to the new Nitta blet end (thick polyurethane side up) making sure to keep both belts flat and straight, (DO NOT OVERLAP THE BELTS).
if the answer is "oneOf [Yes]"
Pull the new Nitta belt through the conveyor. Make sure the Nitta belt is routed correctly over all the return pulleys underneath the conveyor. Once the two edges of the new belt meet remove the duct tape.
if the answer is "oneOf [Yes]"
Before cutting the new belt to length, make sure there is an 18" overlap for NBC 150-AT and a 36" overlap for the NBC 500-AT. The overlap is to compensate for belt loss in the finger splice process. Both belt ends must be cut Straight.
if the answer is "oneOf [Yes]"
Using the Nitta Finger Punch Press assemble the handle and place the press with the arrow sticker pointing in the belt flow direction. WARNING: Use Only TGW Nitta Belt Welder and Punch Equipment for TGW Nitta Belt Splice/ Welding. Non TGW Nitta Belt Welding or Punch Equipment is not Compatible with TGW Nitta Belt!
if the answer is "oneOf [Yes]"
Loosen the bolts to the hold-down plates.
if the answer is "oneOf [Yes]"
Insert one end of the belt, polyurethane side up, through the notched guide on the hold-down bar. Slide the belt all the way through to the other end of the press.
if the answer is "oneOf [Yes]"
Hold the belt firmly while tightening the hold-down bars bolts in an alternating pattern.
if the answer is "oneOf [Yes]"
Position the tip index pin with the first outside hole on the hold-down plate.
if the answer is "oneOf [Yes]"
WARNING: Each hole MUST be punched in PROPER SEQUENCE and EACH END (6x) FROM LEFT TO RIGHT. Failure to do so will cut off one of the fingers making the unusable. Starting at one end of the puncher, make sure the top pin is aligned with outside hole. Press the handle all the way down. This is the 1st punch of 6 needed for each belt end.
if the answer is "oneOf [Yes]"
Return the handle to original position. Move the support plate to the next hole and repeat the process. When complete, loosen the hold-downs and remove the belt.
if the answer is "oneOf [Yes]"
Repeat process for other belt end. Thread the belt into the puncher from the opposite direction. WARNING: DO NOT ROTATE THE FINGER PUNCH PRESS! The press must stay in the same orientation for the entire process.
if the answer is "oneOf [Yes]"
Trim about 0.25" off each fingertip. This will mate each finger in the pre-setter and to ensure a good splice.
if the answer is "oneOf [Yes]"
Install one end of the belt in the Pre-setter mold, making sure the belt fingers are centered in the pre-setter plate. Insert the other end of the belt and slide the fingers together, mating them with no overlaps or large gaps.
if the answer is "oneOf [Yes]"
Install the silicone sheet, with textured side facing down on the belt finger spliced section.
if the answer is "oneOf [Yes]"
Place the pre-setter top plate center over the finger spliced area. Once the top plate is centered, tighten the keeper plate wing nuts to keep the belt flat and secure.
if the answer is "oneOf [Yes]"
Place the TGW welder press on the conveyor and set the pre-setter mold CENTER in the weld press. Clamp the press closed and turn the knob until it slips. CAUTION: Be careful not to pull out the belt from the pre-setter as this may cause the finger splice to gap or overlap.
if the answer is "oneOf [Yes]"
Plug in the TGW welder cord then push the yellow button to start. WARNING: BEFORE OPENING THE WELD PRESS REMOVE THE POWER CORD TO ENSURE THE POWER IS OFF. WARNING: WLDER IS HOT! WEAR HEAT RESESTANT GLOVES. Note: The green light is the actual temperature reading. The amber light is the welder press pre-programmed temperature and should be set at 185 degrees Celsius. Note: When starting the TGW welder press it will automatically run a diagnostic test for about 6 seconds the start heating up to the preset temperature. After 10 minutes at full temperature, the press will automatically shut down the heaters and start the cooling fans. (Total weld time is approximately 60 minutes). Note: The weld cool down process is complete when the actual temperature gage (green light) is 50 degrees Celsius or lower.
if the answer is "oneOf [Yes]"
Only when the actual temperature (green light) is 50 degrees Celsius or lower and when the welder press power cord is unplugged is it safe to open the TGW welder press. Loosen the knob and pull the clamp down to open the press. WARNING: WELDER PRESS IS HOT! USE HEAT RESISTANT GLOVES WHEN OPERATING THE PRESS. WARNING: WELDER PRESS IS NOT! DO NOT LEAVE UNATTENDED
if the answer is "oneOf [Yes]"
Remove the pre-setting mold, pre- setter top plate, silicone sheet, and loosen the keeper plate wing nuts to unlock the belt. Remove the belt from the pre-setter mold.
if the answer is "oneOf [Yes]"
Inspect the top and bottom of the belt. Make sure the belt splice has smoothly joined with even fingers, and no bubbles, gaps, or overlaps.
if the answer is "oneOf [Yes]"
If excess material is present, carefully trim the excess material off the side edges of the belt. Note: Do not cut into the belt.
if the answer is "oneOf [Yes]"
Reinstall the Finger Guards and Rollers.
if the answer is "oneOf [Yes]"
Turn on the air to the take up unit.
if the answer is "oneOf [Yes]"
Restore Power.
Source: ResMed - Atlanta (Community Member)