Strobel 327D, Руководство по эксплуатации

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BA_327D_A2_200715_en.doc
5.4 Problems during sewing and troubleshooting
C A U T I O N ! Danger of injury!
Switch off the machine and ensure it is switched off by pressing
the pedal for switching the motor.
Otherwise there is a danger of injury from crushing and needle
punctures.

Thread breaking
Possible reasons:
-
sharp edges or grooves in needle guide, take-up lever, hook or needle eye
when the machine has been used for a long time.
- The thread between hook and bobbin case breaks or is pinched off.
- Too much oil has penetrated the hook path
- The bobbin is packed too tight or the bobbin sides are forced apart
because the thread is too tightly wound.
- Bobbin case lifting or hook bridge are not correctly adjusted.
- The hook to needle or needle rise has not been correctly adjusted or has
become displaced, meaning that the thread loop is not always taken up.
- Thread tension is set too slack or too tight.
Solutions:
- Replace or re-polish the damaged parts
- Dismantle shuttle, remove bobbin case and polish the feed edges of the
bobbin case and hook path.
-
Using an absorbent thread (cotton thread, core spun thread), sew out on a
remnant.
-
Insert new bobbin
-
Slowly turn the machine by hand and check whether the loop slides
unimpeded through the shuttle. If not, readjust bobbin case lifting or hook
bridge.
-
Correct hook position or hook timing.
-
Correct thread tension - check thread line.
ATTENTION! thread course, thread, Stitch plate with plunger and plunger
limit stop, needle and thread tension should always be set and
chosen according to the material to be sewn.