Operation; Threading The Needle Thread; Adjusting The Needle Thread Tension - Duerkopp Adler 609 Instruction Manual

6.

Operation

6.1 Threading the needle thread

6.2 Adjusting the needle thread tension

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Caution: Danger of injury!
Turn off the main switch !
The needle thread may only be threaded with the sewing machine
switched off.
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Pre-tension
In order to guarantee a safe function of the thread trimmer with the
class 609, it is necessary that the needle thread is under residual
tension when the main tensioner 2 is open.
The residual tension is generated by the pre-tensioner 1.
The pre-tensioner 1 determines the length of the needle thread end
after the thread trimming.
The pre-tension 1 should be set lower than the main tension 2.
–
Adjust the pre-tension 1 by turning the knurled nut.
–
After major changes on pre-tension 1, adjust the main tension 2
accordingly.
Main tension
The main tensioner 2 should be set to the minimum possible tension.
The looping of the threads must be in the center of the material (see
fig. a).
With thin material excessive thread tension can cause unwanted
gathering and thread breakage.
–
Adjust the main tensioner 2 so that the stitches are uniform.
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