Pfaff 260 Service Manual page 89

2. Turn stitch width dial A to "4".
3. Turn eccentric stud A in the needle bar frame pitman (Fig. 107) so that its
lobe is at the top.
4.
Turn eccentric . s tud B (Fig. 106) to set the needle bar as for to the right
(toward the balance wheel) as possible.
5. Loosen zigzag regulator crank on zigzag regulator stud b (Fig. 1 04) just
sufficiently to permit the Iotter to be adjusted from above with the aid of o
slender screwdriver.
6. Push zigzag finger-tip control F up as far as it will go and,
7. while the machine is running, adjust zigzag regulator stud b so that the
needle bar makes no vibrating motion.
8. Release zigzag finger-tip control F and tighten the set screw on the zigzag
regulator crank. Again push up zigzag finger-tip control F and check to see
that the needle bar does not swing sideways.
9. Set stitch width dial A on "0", run the machine and turn regulating screw e
(Fig. 104) to the right or left, as appropriate, until the needle bar ceases to
swing sideways.
10. Turn stitch width dial A to
"4"
and set needle position lever Bat its central
position. Turn eccentric stud A (Fig. 107) to center the needl·e in the needle
plate slot.
11. Rotate the bevel gear on the arm shaft until the needle, as it descends on
the right and left of its throw, ceases vibrating when its point has reached o
position about
5
/32N
to
1
/•N, or 4 to 6 mm, above the
needle plate. (See also
the second paragraph on page 48).
12. Turn stitch width dial A to "0", and set needle position lever B at its left
position.
13. Depress zigzag finger-tip control F repeatedly to check whether the needle
does not vibrate. If adjustment is required, loosen hexagon screw c on the
needle position com finger (Fig. 104) and the lock nut on regulating screw d,
and turn this screw in or out while operating zigzag finger-tip control F,
until any needlle vibration has been eliminated. This will normally be the
case when the clearance at f (Fig. 104) is
5 /32",
or 4 mm.
14. Put needle position lever B in the central notch.
15. Adjust the needle throw in relation to the center line in the needle plate
slot by means of eccentric stud B (Fig. 106). To make this adjustment, turn
stitch width dial A to "4", then to "0".
16. Set stitch width dial A on "0" and put needle position lever B in the central
notch. Turn eccentric stud A (Fig. 107), as may be appropriate to center the
needle in the needle plate slot.
17. Double-check the position of the needle and of the needle throw in relation
to the needle plate slot and, if necessary, repeat the adjustments discussed
in paragraphs 15 and 16 above. To check the correct setting, place a piece
of cardboard under the needle.
Important
Having made this adjustment conscientiously, tighten all set screws securely.
88