TL;DR
End breakage increases are usually a traveler worn or of wrong weight, ring rail misalignment, or drafting zone pressure out of spec. Check the traveler first as it is the fastest fix.
What you might see
- ends-down count above normal baseline
- yarn breaks localized at the ring rail
- balloon instability visible on running spindles
- cop build taper inconsistent
Likely causes
Traveler worn or of incorrect weight for the yarn count and spindle speed
Ring rail traversal speed too fast or ring worn, causing balloon instability
Drafting zone top roller pressure out of specification, causing drafting faults
Roving irregularity or wrong hank feeding the frame
Required tools
- Traveler inspection magnifier
- Replacement travelers (correct weight and type for the count)
- Spirit level for ring rail check
- Drafting zone pressure gauge
Safety first
- The spindle row runs at high speed. Keep loose clothing, hair, and bare fingers away from the spindle rail when the machine is running.
- Travelers are small metal clips. Carry them in a covered container to prevent accidental eye contact if dropped.
Procedure
- 1
Record the ends-down count per 1000 spindle hours from the machine or production log to quantify the breakage rate.
- 2
Inspect travelers on 10 representative spindles under a magnifying glass. Look for flat spots, cracks, or glazed surfaces. Replace all travelers on the machine if more than 20% show wear.[1]
- 3
Verify the traveler weight and type matches the setup card for the current count and spindle speed.
- 4
Check the ring surface on 10 rings for rust, scratching, or groove wear. Replace worn rings.
- 5
Inspect the ring rail for level alignment across the length of the machine. A ring rail tilt greater than 0.5 mm per meter causes differential balloon instability.[1]
- 6
Check the drafting zone top roller pressure with a pressure gauge. Adjust to the value on the setup card for the fiber type and count.
- 7
Monitor the ends-down count for 1 hour after any correction to confirm the rate is declining.
Sources
Rieter Rieter G 38 / K 48 ring frame Spinning Frame (Ring / Open-End) general technical documentation, Rieter
Rieter ring spinning frame general traveler selection and maintenance procedures (general)
More guides for Rieter Rieter G 38 / K 48 ring frame
How to fix spindle vibration and bearing noise on a Rieter G 38 / K 48
Spindle vibration is most often a worn spindle bearing, an imbalanced bobbin, or a bent spindle shaft. Check oil level first, then rotate the spindle by hand to feel for roughness.
How to fix yarn unevenness with thick and thin places on a Rieter G 38 / K 48
Yarn unevenness is most often a worn drafting apron, a damaged top roller cot, or a drafting zone setting wrong for the fiber. Check the apron and cots before changing any zone distances.
Stop fixing the same fault twice.
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