Pfaff select 1520, Service Manual

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73
40. Adjustment of equal forward and reverse stitch length
(for forward and reverse controlled utility stitches)
Requirement:
The needle perforations for the honeycomb stitch must always take place in the same penetration holes
for forward and reverse feed (fig. 82).
Check:
z
Set the adjustment dial for the stitch length against the stop of the triple stitch symbol.
z
Press the button for honeycomb stitching (on Pfaff 1520 /1530 set the automatic unit adjustment dial to
"F").
z
Place two layers of linen fabric under the presser foot and sew the honeycomb stitch.
Adjustment:
z
Loosen hexagon head screw 129 by just 1/8 of a turn, using a 5.5 mm spanner (fig. 82).
z
Loosen screw 130 by approx. 2 turns.
z
Tighten screw 129 just a little.
z
Sew the honeycomb stitch. The stitch length of the honeycomb stitch should now be a bit too long.
z
Loosen screw 129.
z
Tighten screw 130 just a little.
z
Slightly tighten screw 129.
z
Sew the honeycomb stitch and check needle perforations.
z
Continue adjusting screws 129 and 130 until the needle enters the same perforations.
z
Tighten screw 129 securely.
Cross-check:
Sew the honeycomb stitch and the stretch triple straight stitch and check whether the needle always ent-
ers the same perforations.