Thread Tension Of The Bobbin Case; Upper Thread Tension - Husqvarna 1200 Service Manual

Thread tension
11 The thread tension of the bobbin case
Requirements
The thread tension spring of the bobbin case
shall give a thread resistance of 18-22 g when
pulling the tread slowly.
Check weight 22g ref.n 412 15 83-01.
Adjustment
Remove any loose pieces of thread collected
under the thread tension spring.
Attach the thread to the weight and hold the
bobbin case, letting the thread hang vertically
in direction of the bobbin case finger. When
the thread tension is correctly set the weight
shall pull the thread slowly from the bobbin case.
Adjust the thread tension by means of the screw.

12 Upper thread tension

Requirements, model 1050/1070/1090
When the machine is set at straight stitching resp. zig-zag,
a correct take-up should be obtained, when the catch of the
thread tension pulley (5,5) is right in front of the index.
Requirements, model 1100/1200
When the sewing guide of the machine is set at non
elastic normal and straight stitching resp. zig-zag, a
correct take-up should be obtained, when the catch of
the thread tension pulley (5,5) is right in front of the index.
Comment 1
The sewing guide adjusts the thread tension to the fabric resp.
to the sewing at which the machine is set.This is done by means
of the computer and the step motor of the machine.
Comment 2
The thread tension that is set now is to be regarded as a general indication.
This general indication can be risen and lowered by means of the thread
tension pulley and remains as long as the main switch is on.
Adjustment
Remove the rear cover, (P.44).
At the side of the thread tension dial there is an adjustment screw (A) for the setting of
the upper thread tension.
This is accessible from the rear by means of a screwdriver.
Set the catch of the thread tension dial in the middle of the index.
When test sewing with normal fabric and thread turn the adjustment screw until the correct
take-up is obtained for straight stitching and zig-zag.
32 Husqvarna service manual 104 72 30-26
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