Pfaff 238-0 User Manual

32. Adjusting the Needle Position
Pfaff 238 machines normally are set to make zigzag stitches which extend the same
distance from the zero position both ways (central needle position). To check this set
ting, set knob G on "0" and put lever H in notch II (Fig. 20). Place a piece of thin card
board under the sewing fool and rotate the balance wheel toward you until the needle
stitches into the cardboard lightly. Flick knob G to "4", rotate the balance wheel for
ward, then backward, and let the needle, descending on the right and left of its throw,
stitch into the cardboard lightly. The setting is correct if the right and left punctures are
equidistant from the central puncture.
To adjust, loosen set screw 1 (Fig. 37) and turn eccentric stud h to the right or left, as
appropriate. Then tighten set screw i securely.
R 6686
Fig. 38
33. Adjusting the Needle Throw
The sideways motion of the needle bar must be timed correctly in relation to Its vertical
motion so that the needle will not begin to vibrate until it has risen clear of the goods
and will cease vibrating when it again reaches the goods.
To check this setting, flick knob G to "4" and watch the needle vibration. If adjustment
is required, rotate the bevel gear on the arm shaft, as may be required.
To double-check this setting, raise the needle bar to Its highest point and set lever H
(Fig. 20) In notch II. The setting is correct if the needle bar makes no sideways motion
when you turn knob G to the right and left.
For a coarse adjustment, rotate the balance wheel until set screw Q on the needle bar
crank (Fig. 33) is visible In the aperture in the machine arm. Loosen set screws k and
I (Fig. 38) and turn the arm shaft bevel gear until lobe w of the needle vibrating eccen
tric (Fig. 33) points upward. Tighten both set screws securely after the adjustment.
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From the library of: Superior Sewing Machine & Supply LLC

Pfaff 238-0 Specifications

General

Brand	Pfaff
Model	238-0
Category	Sewing Machine
Language	English