6.
Subclass
Conversion
Parts which differ with each subclass
are
compiled in the Annex. (See also
Form No. 10080, Subclass
Organizations
of the Pfaff 3334).* Such
parts
are
essentially the feed cam, the clomp feet,
and
the feed plate. If the worm
gear
assembly has to be
exchanged
in
order
to convert
one
subclass machine
into
another,
it is
advisable
to ship the machine to your
nearest
PfafF
distributor.
a.
Changing
the Feed Com
Unscrew wing nut 6 (Fig 63), loosen binding screw 9,
and
strip feed
across
regulator
5. Unscrew nut 4,
and
pull
the
feed
cam
off its
shaft.
In
placing the new feed com on its shaft, make sure the rollers ride in the
pattern-forming grooves without having any play. Tighten nut 4, and check to
see that the rollers do not chafe against the bottom of the grooves (see clear
ance
marked "x" in Fig. 63). If the roller in the
rear
groove
should chafe
against
the bottom of this groove, place a
spacer
between
the hub of the cam
and
the
positioning flange on the worm wheel shaft. If the roller in the front groove
should chafe ogainst the bottom of this groove, place a spocer between the
feed across regulator
and
its bearing bracket.
1 =
Feed
cam
2 =
Roller
3 =
Roller
stud
4 =
Nut
5 = Feed across regulator
6 =
Wing
nut
7 = Ball screw stud,
upper
8 = Hinge stud
9 = Binding screw
10 = Ball joint connection
11 = Boll
stud,
lower
12
=
Feed
across
shaft
13 = Feed
across
shaft
crank,
rear
Fig.63 Exchanging the feed com
Available in Germon only
L
69
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