Adjusting The Needle Thread Tension - DURKOPP ADLER 838 Instruction Manual

6.4.2

Adjusting the needle thread tension

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Adjusting the pre-tensioner (1)
–
When the main thread tensioner (3) and the supplementary
tensioner (2) are open, there must still be a slight tension
remaining on the needle thread. This residual tension is created by
the pre-tensioner (1). The pre-tensioner (1) influences both the
length of the cut needle thread and the starter thread for the next
seam. (The pre-tensioner (1) is not deactivated with the sewing
foot lift.)
Adjusting the thread tension (2) and (3)
–
You can switch off the supplementary tensioner (2) by pressing the
button (4). You can switch the supplementary tensioner (2) back on
by pressing the button (4) again. The switchable supplementary
tensioner (2) is helpful for quickly altering the needle thread
tension. For example, it can be used to attain a good stitch draw
and consistent stitch pattern when working with different textile
materials within a single seam.
–
Press the button (4).
–
Make a seam on a few layers of materials and regulate the thread
tension by means of the main tensioner (3) until the proper
cross-over point is attained (see illustration).
–
Extend the material layers and press button (4) to activate the
supplementary tensioner (2). Control until the proper cross-over
point (thread binding) has been attained.
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