Adjusting The Presser Foot Pressure; Adjusting The Trailing Length After Thread Trimming (Models With Thread Trimmer Only) - Brother T-8422A Instruction Manual

8-2. Adjusting the presser foot pressure

Correct stitches
Becomes weaker
8-3. Adjusting the trailing length after thread trimming (Models with thread
trimmer only)
Longer
Shorter
2926M
Upper thread
0894M
Skipped stitches occur
0895M
Uneven stitch length
0896M
Stitches are puckered
0897M
Becomes stronger
2925M
Trailing thread
2927M
T-8421A, 8422A, 8452A, 8722A, 8752A
Increase the pressure.
Decrease the pressure.
The presser foot pressure should be as weak as possible,
but strong enough so that the material does not slip.
(Refer to "Adjusting screw height" in the table below as a
guide to adjustment.)
1. Loosen the adjusting nut (1).
2. Turn the presser adjusting screw (2) to adjust the presser
foot pressure.
3. Tighten the adjusting nut (1).
Reference values
Use
For foundation
For light-weight and
medium- weight
materials
For heavy-weight
materials
At the time of thread trimming, the thread tension is
loosened and tension is applied by the pretension (1) only.
The standard trailing length for the upper thread is 33–37
mm.
If the tension of the pretension (1) is increased, the
lengths of the threads trailing from the needle tips will be
reduced; if the tension is reduced, the lengths will be
increased.
Adjust by turning the pretension (1).
8. THREAD TENSION
Adjusting screw height
Approx. 34mm
Approx. 34mm
Approx. 29mm
36