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5.7
Adjusting looper-thread tension
Adjusting brake spring 1 (class 69-FA-373)
On subclass 69-FA-373 the brake spring 1 prevents the bobbin from "running on" when
the machine halts or if the looper thread is wound off spasmodically.
–
Unscrew regulating screw 4 until no tension remains in tension spring 3.
–
Adjust brake spring 1 with regulating screw 5.
The braking force is correctly adjusted if brake spring 1 is about 1 mm above
surface 2.
Adjusting tension spring 3
–
Adjust tension spring 3 with regulating screw 4.
to increase looper-thread tension: turn screw clockwise
to reduce looper-thread tension: turn screw anticlockwise
For stitch formation see sketch a on page 12.
5.8
Fitting and changing the needle
–
Turn the handwheel until the needle bar 6 reaches its highest position.
–
Undo screw 7.
–
Pull needle downwards out of needle bar 6.
–
Insert new needle as far as it will go into the hole in needle bar 6.
Caution:
When seen from the operating side of the machine the furrow 8 of the needle must
point to the rights(see sketch).
–
Tighten screw 7.
Failure to comply with this instruction can cause the following faults:
when fitting a thinner needle:
when fitting a thicker needle:
Caution: danger of injury
Turn off the main switch.
The looper-thread tension may only be adjusted with the
sewing machine switched off.
Caution: danger of injury
Turn off the main switch.
The needle may only be changed with the sewing machine
switched off.
CAUTION:
When a thicker needle is fitted the distance from the
shuttle to the needle must bed corrected (see servicing
instructions).
faulty stitches, damage to thread
damage to the shuttle tip and needle
17
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