Adjusting The Stitch Width Control - Pfaff 260 Service Manual

Do not apply force in replacing the barrel as this might cause bending of t,he
com fingers in the stitch width regulating mechanism which, in turn, might
cause hard working of this mechanism. The same trouble is likely to occur if
the barrel is pushed in, or stands out, too for.
If no mark has been mode on the machine arm beforehand, turn the zigzag
regulator barrel until
a. on imaginary line drawn through the red mark h on the barrel (Fig. 51)
posses to the right o·f the hinge stud located above it, and
b. needle position lever B points downward when set at its central position.
In all three needle positions, the rounded tip of the needle position com finger
should be located in the middle of the respective section of the needle position
com.
To double-check this setting, slightly move the needle position lever to the
right and left of its central position and check to see that the zigzag regulator
arm does not vibrate. Repeat this check with the needle position lever set at its
left and right positions, respectively.
While on previous machines, the barrel must be pushed into the machine arm
until the set screw enters the small groove in its rim, on recent machines, it
must be pushed in as for as it will go.
If stitch width dial A should turn heavily on older machines, loosen the set
screw and either push in or pull out the barrel slightly. Then tighten the set
screw securely.
Replace the second tension spring (b in Fig. 93).
Adjusting the Stitch Width Control
(See also page 88)
To check the correct position of the zigzag regulator barrel in the machine
arm, turn stitch width dial A to "0".
The sideways movement of the connecting rod (105193) must not begin until
stitch width dial A has been turned clockwise by three or four knurls.
As you depress finger-tip control F, the connecting rod should move likewise.
If these conditions ore not met, correct
the position of the barrel in the machine
arm.
After the above-mentioned adjustment has been mode, also check to see that
a. needle position lever B points downward when set at its central position,
b. the lobe of eccentric stud B (Fig. 106) points toward the balance wheel and
the needle bar frame pitman is at its extreme right-hand position,
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