Tajima TFMX-C Thread Jamming (Bird’s Nesting) Troubleshooting Guide

1. Incorrect Thread Tension (Upper or Bobbin) high likelihood

How to tell

Excessive thread accumulation or loose loops appear on the underside of the fabric. The upper thread may appear too loose, or the bobbin thread may be pulled excessively to the top.

Fix

1. For upper thread: Locate the upper thread tension adjustment knob for the affected needle. Turn it clockwise to increase tension or counter-clockwise to decrease. Perform test stitches on scrap fabric, aiming for a balanced stitch where about 1/3 bobbin thread shows on the underside.
2. For bobbin thread: Remove the bobbin case. Hold the bobbin case by the thread tail; it should slowly drop a few inches and then stop, or 'yo-yo' slightly. If it drops too fast, tighten the small screw on the bobbin case spring. If it doesn't drop, loosen the screw. Use a bobbin tension gauge for precise adjustment, aiming for 18-22 grams of tension for general embroidery.

TENSION BASE (for upper tension discs), Rotary Hook Assembly (for bobbin case)

Parts involved: Thread path & tension → Rotary hooks & bobbin cases →

2. Improper Machine Threading high likelihood

How to tell

The thread may be visibly out of a guide, not seated in the tension discs, or incorrectly routed through the take-up lever or needle bar thread guide. This often results in inconsistent stitching or immediate jamming upon starting.

Fix

1. Completely unthread the affected needle from the cone to the needle eye.
2. Consult your Tajima TFMX-C operator's manual for the correct threading path. Pay close attention to ensuring the thread passes through all guides, is seated firmly between the tension discs, and correctly enters the take-up lever eye and needle bar thread guide.
3. Ensure the thread is correctly inserted into the needle eye from front to back.

UPPER THREAD HOLDER, TENSION BASE, NEEDLE BAR CASE 1

Parts involved: Thread path & tension → Needles & needle bars →

3. Worn, Bent, or Incorrect Needle medium likelihood

How to tell

Skipped stitches, frayed thread, or thread breaks often accompany jamming. A visual inspection may reveal a bent needle, a burr on the needle eye or shaft, or a dull point. Using an incorrect needle type or size for the thread and fabric can also cause issues.

Fix

1. Turn off the machine power.
2. Loosen the needle clamp screw for the affected needle and remove the old needle.
3. Inspect the needle for any signs of damage (bend, burrs, dullness).
4. Replace with a new, correct needle type (e.g., DBxK5) and size (e.g., 75/11 or 80/12) appropriate for your thread and fabric. Ensure the scarf (long groove) faces the front and the eye is aligned correctly.
5. Tighten the needle clamp screw securely, but do not overtighten.

NEEDLE BAR CASE 1

Parts involved: Needles & needle bars →

4. Poorly Wound Bobbin medium likelihood

How to tell

The bobbin thread may appear unevenly distributed on the bobbin, or the thread may be 'digging in' to lower layers. This can lead to inconsistent bobbin tension and thread jams.

Fix

1. Remove the problematic bobbin.
2. If using pre-wound bobbins, ensure they are high-quality and designed for industrial embroidery machines. Inferior quality bobbins can have inconsistent winding.
3. If winding your own bobbins, use the machine's bobbin winder. Ensure the thread is guided correctly through the winder's tension unit to achieve an even, firm wind. Adjust the winder's tension if necessary (refer to your manual for specific adjustments).
4. Avoid overfilling the bobbin.

Rotary Hook Assembly

Parts involved: Rotary hooks & bobbin cases → Threads & supplies →

5. Lint and Debris Accumulation medium likelihood

How to tell

Visible lint, dust, or thread fragments are present in the bobbin case area, under the needle plate, or within the upper thread path (tension discs, guides). This can impede smooth thread movement.

Fix

1. Turn off the machine power.
2. Remove the needle plate and bobbin case. Use a small brush, lint-free cloth, or compressed air (used carefully, blowing away from sensitive electronics) to thoroughly clean the bobbin case, rotary hook area, and under the needle plate.
3. Open the upper tension discs and use a thin, lint-free cloth or dental floss to clean between them.
4. Inspect and clean all thread guides on the machine head and thread tree.

Rotary Hook Assembly, TENSION BASE

Parts involved: Rotary hooks & bobbin cases → Thread path & tension → Lubrication & maintenance →

6. Fabric Not Properly Hooped or Incorrect Stabilizer low likelihood

How to tell

The fabric may appear loose or wrinkled within the hoop, or it may shift during embroidery. The design might pucker, or the thread may snag on loose fabric, leading to jamming. The stabilizer may be too thin or inappropriate for the fabric/design density.

Fix

1. Remove the hoop and re-hoop the fabric. Ensure the fabric is taut like a drum, without being stretched or distorted. Use the correct size hoop for the design.
2. Ensure the stabilizer is appropriate for the fabric type and stitch density of the design. It should be firm enough to support the stitches without allowing the fabric to pucker or shift. Adhere or hoop the stabilizer with the fabric correctly.
3. If using a sticky-back stabilizer, ensure it is fresh and has sufficient adhesion.

FRAMING

Parts involved: Hoops & frames → Threads & supplies →

7. Poor Thread Quality or Storage low likelihood

How to tell

Thread may fray, break frequently, or tangle easily. Older thread or thread stored improperly may feel brittle or have inconsistent thickness.

Fix

1. Use high-quality, reputable embroidery thread specifically designed for high-speed industrial machines. Avoid cheap or generic threads.
2. Store thread cones in a cool, dry place away from direct sunlight and humidity, which can degrade thread strength.
3. If a thread cone is suspected, try a new cone of a known good brand and type.

Parts involved: Threads & supplies →

8. Machine Speed Too High for Design Complexity low likelihood

How to tell

Jams occur more frequently on intricate designs, small lettering, or high-density areas when the machine is running at maximum speed. The machine may struggle to form stitches correctly.

Fix

1. For complex, dense, or intricate designs, reduce the machine's operating speed. This allows the thread, needle, and hook mechanism more time to form a perfect stitch.
2. Gradually increase speed only after confirming stable, jam-free operation at a lower speed.

OPERATION PANEL

Parts involved: Motors & drivers → Control panels & displays →

9. Improper Thread Cone Placement low likelihood

How to tell

The thread may snag, jump, or pull unevenly from the cone, especially at higher speeds. The cone may wobble or fall off the thread stand.

Fix

1. Ensure the thread cone is placed securely on a stable thread stand pin. The thread should unwind smoothly from the top of the cone.
2. Use a thread net for slippery threads (like rayon or metallic) to prevent them from pooling or unwinding too quickly.
3. Verify the thread path from the cone to the first guide is clear and unobstructed.

Parts involved: Threads & supplies → Thread path & tension →