Stitch Forming Perts - Pfaff creative 7550 Service Manual

Stitch
forming parts
Foreword:
The sewing hook adjustment consists basically of the three following
Needle rise
Needle bar height
Hook-to-needle clearance
Needle rise:
The needle rise is th e movement by which the needle must rise from Its lowest position until a thread
loop has formed on the side of the needle on which the
Needle bar he g h t :
i
The needle bar heigth must be set in such a way that the sewing hook point can easily enter the
thread loop above the needle eye at straight stitch and zigzag stitch settings.
Hook-to-needle clearance:
The distance or the sewing hook point from the needle must be as small as possible.
sewing hook point does no� miss the thread loop
of s-ing
The sequence
Hook-to-needle clearance
1.
2. Bevelgear seWng
3.
Needle rise
4. Needle bar height
24
.
as follows:
h.ook adj u stments Is
adjustments:
scarf
is located.
so
that the