Pfaff 1540 - Manual (Page 56)

54
Stitch forming parts (sewing hook)
Foreword:
The sewing hook adjustment consists basically of the three following adjustments:
z Needle rise (sewing hook timing)
z Needle bar height
z Hook-to-needle clearance
Needle rise (sewing hook timing):
The needle rise is the 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 scarf is located.
Needle bar height:
The needle bar height 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 of the sewing hook point from the needle must be as small as possible, so that the sewing
hook point does not miss the thread loop.
The sequence of sewing hook adjustments is as follows:
1. Hook-to-needle clearance
2. Bevel gear setting
3. Needle rise (sewing hook timing)
4. Needle bar height