Operation; Threading The Needle Thread; Setting The Needle Thread Tension; Releasing The Needle-Thread Tension - Duerkopp Adler 275 Instruction Manual

6. Operation

6.1 Threading the needle thread

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Place the yarn reel on the reel stand as shown in the illustration.
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Thread the needle thread as shown in the diagram on the preceding page.

6.2 Setting the needle thread tension

Setting the needle thread pre-tensioner
The needle thread main tensioner 4 is opened while the thread is cut, but to ensure that
the thread is cut reliably the needle thread must be under slight residual tension. This
residual tension is produced by the needle thread pre-tensioner 1.
The pre-tensioner 1 simultaneously affects the length of the end of the cut needle
thread, and hence the thread length needed for the next secure seam start.
Basic setting:
To shorten the starting thread:
To lengthen the starting thread:
Important: After major changes to the needle-thread pre-tensioner it may
be necessary to adjust the main tensioner 4 in order to achieve
consistent results.
Adjusting the main tensioner
The needle-thread pre-tensioner 1 and main tensioner 4 together produce the thread
tension required for the seam (see fig. a).
Adjustment:
To increase tension: turn the knurled nut 4 clockwise
To reduce tension: turn the knurled nut 4 anti-clockwise

6.3 Releasing the needle-thread tension

Automatic
The main tensioner 4 is automatically raised when the thread is cut.
Caution: danger of injury
Turn off the main switch.
The needle thread may only be threaded with the machine
turned off.
Turn knurled nut 2 until its front is flush
with the bolt 3.
Turn knurled nut 2 clockwise
Turn knurled nut 2 anti-clockwise.
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