Stitching Off; Adjustment Of Needle Threader - Pfaff expression 2014 Service Manual

Stitching off

15. Adjustment of needle threader

Requirement:
With the threader key pushed fully down, prong 62 must pass through in the center between the top and
bottom edge of the needle eye of a needle size Nm 70 (fig. 42).
Check:
Insert a new needle system 130/705 H, size Nm 70.
Switch on the machine (stitch program 01).
Set the machine at top needle position by briefly pressing the foot control.
Push threader key 63 fully down.
Carry out a visual and functional test.
Height adjustment:
Loosen the screw on the face cover and remove face cover.
Press threader key 63 fully down and hold it in this position (fig. 44).
Loosen allen screw 66 by only a 1/4 of a turn (fig. 43).
Push the complete threader bar frame 67 either upwards or downwards until prong 62 has the same
clearance to the top and bottom edge of the needle eye (fig. 42).
Tighten allen screw 66 in this position (fig. 43).
Cross-check 1:
Using threader key 63, move the needle threader up and down.
Whilst doing so, carry out a visual check of the prong height.
When the threader key is pushed down, pin 64 must pass completely through the diagonal guide slot
and rest on the upper end.
Lateral adjustment:
Using threader key 63, place threader prong 62 at the front in the needle eye.
Loosen screw 65 by only 1/8 of a turn (fig. 44).
Push the threader bar frame either to the left or right until the prong is in the exact middle of the
needle eye.
Tighten screw 65.
Cross-check 2:
Activate threader key 63.
Whilst doing so, carry out a visual check of the lateral position
of the prong.
44