Dürkopp Adler 884-xxx-M series, Инструкция по эксплуатации

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6.4 Bobbin thread clamp
Rule:
The clamping force of the spring (1) should be high enough so as the
tension needed to pull out the bottom thread is approximately the same
as the tension needed to pull this thread from the hook bobbin.
–
Sew and cut the threads.
–
Pull the bottom thread. If its tension is too low (the thread under the
spring can easily slip out), turn the hand wheel to the angle 290°,
tilt the hook cover up and slightly bend the spring (1) downwards
with a screwdriver.
–
Repeat the seam sewing, do the thread cutting, perform a test of
the tension needed to pull the thread out, and slightly bend the
spring, until the thread is reliably retained with the spring.
Caution: Risk of injury!
Turn the main switch off.
Only adjust the clamping spring when the machine is turned off.
CAUTION!
Sewing problems can result when the clamping spring is improperly
adjusted.
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