Adjusting The Bobbin Winder - Pfaff 260 Service Manual

Set stitch length dial G on "0" and run the machine. Check to see tha t the feed
dog moves up and down, but does not move bock and forth. If adjustment is
required, rotate the stitch length regulator mechanism to the right or left, as
appropriate. Do not forget to tighten the set screw securely which holds the
mechanism in place.
Adjustment of the stitch length regulator mechanism is greatly facilitated by
wrench No. 106300-304 which can be obtained from Pfaff a t extra cost.
Adjusting the Bobbin W inder
Fig. 93
Adjusting the
bobbin winder
Each bobbin winder is adjusted and tested at the factory with utmost accuracy
in order to ensure even bobbin winding. If thread should pile up at one end
of the bobbin, this may be an indication that force was applied in removing
or replacing the top cover. As a result, the bobbin winder frame may have
been bent out of shape and t:he bobbin w inder spindle may be no longer in
o vertical position.
If thread piles up at the top end, the spindle has been bent to the left; and,
conversely, if thread piles up at the bottom end, the spindle has been bent to
the right.
To remedy this condition, straighten the bobbin winder frame. On recent ma-
chines, the bobbin winder frame has been reinforced so that it will not nor-
mally be bent out of shape.
After this adjustment has been performed, the lateral position of the bobbin
winder is adjusted in relation to the balance wheel. To do this, loosen set
screw a in the bobbin winder frame base (Fig. 93) and move the Iotter over to
the balance wheel until the rubber ring on the winder pulley just contacts the
inner surface of the balance wheel and is driven securely when the bobbin
winder is engaged. Excessive pressure exerted on the balance wheel by the
bobbin winder pulley will result in heavy working of the machine and prema-
ture wear of the rubber ring.
57