9 - 8
Setting up
9.09.03 Applying fullness intermittently
● Turn adjustment wheel 1 as far as possible in the "+" direction.
● Turn adjustment wheel 2 until " 0 " is at marking 3.
● Turn adjustment wheel 1 back until the desired level of fullness (green numbers) is
at marking 3.
● Adjust the stitch length (see chapter 9.08 Adjusting the stitch length).
The sum of the selected fullness level and the stitch length must not exceed
4.5 because more than this lessens the stitch length.
When the left pedal is in its neutral position, the machine works with the same
feed stroke for the main and differential feed dogs. When the left pedal is
operated, the fullness set on adjustment wheel 1 is worked into the bottom ma-
terial ply (see Chapter 7.03 Pedal on the PFAFF 939 U.
9.09.04 Constantly stretch the top material ply.
● Turn adjustment wheel 1 as far as possible in the "+" direction.
● Turn adjustment wheel 2 until the desired level of stretch (red numbers) is at marking 3.
● Turn adjustment wheel 1 back until the same red number is at marking 3.
● Adjust the stitch length (see chapter 9.08 Adjusting the stitch length).
1
0
2
3
4
1
2
3
Fig. 9 - 11
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